Initial import.

1 files changed, 5081 insertions, 0 deletions

diff --git a/chromium/third_party/ffmpeg/libavcodec/h264.c b/chromium/third_party/ffmpeg/libavcodec/h264.c
new file mode 100644
index 00000000000..05f586f4137
--- /dev/null
+++ b/chromium/third_party/ffmpeg/libavcodec/h264.c
@@ -0,0 +1,5081 @@
+/*
+ * H.26L/H.264/AVC/JVT/14496-10/... decoder
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * H.264 / AVC / MPEG4 part10 codec.
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "internal.h"
+#include "cabac.h"
+#include "cabac_functions.h"
+#include "dsputil.h"
+#include "error_resilience.h"
+#include "avcodec.h"
+#include "mpegvideo.h"
+#include "h264.h"
+#include "h264data.h"
+#include "h264chroma.h"
+#include "h264_mvpred.h"
+#include "golomb.h"
+#include "mathops.h"
+#include "rectangle.h"
+#include "svq3.h"
+#include "thread.h"
+#include "vdpau_internal.h"
+#include "libavutil/avassert.h"
+
+// #undef NDEBUG
+#include <assert.h>
+
+const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
+
+static const uint8_t rem6[QP_MAX_NUM + 1] = {
+    0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
+    3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
+    0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
+    3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
+    0, 1, 2, 3,
+};
+
+static const uint8_t div6[QP_MAX_NUM + 1] = {
+    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3,  3,  3,
+    3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6,  6,  6,
+    7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10,
+   10,10,10,11,11,11,11,11,11,12,12,12,12,12,12,13,13,13, 13, 13, 13,
+   14,14,14,14,
+};
+
+static const enum AVPixelFormat h264_hwaccel_pixfmt_list_420[] = {
+#if CONFIG_H264_DXVA2_HWACCEL
+    AV_PIX_FMT_DXVA2_VLD,
+#endif
+#if CONFIG_H264_VAAPI_HWACCEL
+    AV_PIX_FMT_VAAPI_VLD,
+#endif
+#if CONFIG_H264_VDA_HWACCEL
+    AV_PIX_FMT_VDA_VLD,
+#endif
+#if CONFIG_H264_VDPAU_HWACCEL
+    AV_PIX_FMT_VDPAU,
+#endif
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_NONE
+};
+
+static const enum AVPixelFormat h264_hwaccel_pixfmt_list_jpeg_420[] = {
+#if CONFIG_H264_DXVA2_HWACCEL
+    AV_PIX_FMT_DXVA2_VLD,
+#endif
+#if CONFIG_H264_VAAPI_HWACCEL
+    AV_PIX_FMT_VAAPI_VLD,
+#endif
+#if CONFIG_H264_VDA_HWACCEL
+    AV_PIX_FMT_VDA_VLD,
+#endif
+#if CONFIG_H264_VDPAU_HWACCEL
+    AV_PIX_FMT_VDPAU,
+#endif
+    AV_PIX_FMT_YUVJ420P,
+    AV_PIX_FMT_NONE
+};
+
+int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx)
+{
+    H264Context *h = avctx->priv_data;
+    return h ? h->sps.num_reorder_frames : 0;
+}
+
+static void h264_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
+                              int (*mv)[2][4][2],
+                              int mb_x, int mb_y, int mb_intra, int mb_skipped)
+{
+    H264Context    *h = opaque;
+
+    h->mb_x  = mb_x;
+    h->mb_y  = mb_y;
+    h->mb_xy = mb_x + mb_y * h->mb_stride;
+    memset(h->non_zero_count_cache, 0, sizeof(h->non_zero_count_cache));
+    av_assert1(ref >= 0);
+    /* FIXME: It is possible albeit uncommon that slice references
+     * differ between slices. We take the easy approach and ignore
+     * it for now. If this turns out to have any relevance in
+     * practice then correct remapping should be added. */
+    if (ref >= h->ref_count[0])
+        ref = 0;
+    if (!h->ref_list[0][ref].f.data[0]) {
+        av_log(h->avctx, AV_LOG_DEBUG, "Reference not available for error concealing\n");
+        ref = 0;
+    }
+    if ((h->ref_list[0][ref].reference&3) != 3) {
+        av_log(h->avctx, AV_LOG_DEBUG, "Reference invalid\n");
+        return;
+    }
+    fill_rectangle(&h->cur_pic.ref_index[0][4 * h->mb_xy],
+                   2, 2, 2, ref, 1);
+    fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
+    fill_rectangle(h->mv_cache[0][scan8[0]], 4, 4, 8,
+                   pack16to32((*mv)[0][0][0], (*mv)[0][0][1]), 4);
+    h->mb_mbaff =
+    h->mb_field_decoding_flag = 0;
+    ff_h264_hl_decode_mb(h);
+}
+
+void ff_h264_draw_horiz_band(H264Context *h, int y, int height)
+{
+    AVCodecContext *avctx = h->avctx;
+    Picture *cur  = &h->cur_pic;
+    Picture *last = h->ref_list[0][0].f.data[0] ? &h->ref_list[0][0] : NULL;
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
+    int vshift = desc->log2_chroma_h;
+    const int field_pic = h->picture_structure != PICT_FRAME;
+    if (field_pic) {
+        height <<= 1;
+        y <<= 1;
+    }
+
+    height = FFMIN(height, avctx->height - y);
+
+    if (field_pic && h->first_field && !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
+        return;
+
+    if (avctx->draw_horiz_band) {
+        AVFrame *src;
+        int offset[AV_NUM_DATA_POINTERS];
+        int i;
+
+        if (cur->f.pict_type == AV_PICTURE_TYPE_B || h->low_delay ||
+           (avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
+            src = &cur->f;
+        else if (last)
+            src = &last->f;
+        else
+            return;
+
+        offset[0] = y * src->linesize[0];
+        offset[1] =
+        offset[2] = (y >> vshift) * src->linesize[1];
+        for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
+            offset[i] = 0;
+
+        emms_c();
+
+        avctx->draw_horiz_band(avctx, src, offset,
+                               y, h->picture_structure, height);
+    }
+}
+
+static void unref_picture(H264Context *h, Picture *pic)
+{
+    int off = offsetof(Picture, tf) + sizeof(pic->tf);
+    int i;
+
+    if (!pic->f.data[0])
+        return;
+
+    ff_thread_release_buffer(h->avctx, &pic->tf);
+    av_buffer_unref(&pic->hwaccel_priv_buf);
+
+    av_buffer_unref(&pic->qscale_table_buf);
+    av_buffer_unref(&pic->mb_type_buf);
+    for (i = 0; i < 2; i++) {
+        av_buffer_unref(&pic->motion_val_buf[i]);
+        av_buffer_unref(&pic->ref_index_buf[i]);
+    }
+
+    memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
+}
+
+static void release_unused_pictures(H264Context *h, int remove_current)
+{
+    int i;
+
+    /* release non reference frames */
+    for (i = 0; i < MAX_PICTURE_COUNT; i++) {
+        if (h->DPB[i].f.data[0] && !h->DPB[i].reference &&
+            (remove_current || &h->DPB[i] != h->cur_pic_ptr)) {
+            unref_picture(h, &h->DPB[i]);
+        }
+    }
+}
+
+static int ref_picture(H264Context *h, Picture *dst, Picture *src)
+{
+    int ret, i;
+
+    av_assert0(!dst->f.buf[0]);
+    av_assert0(src->f.buf[0]);
+
+    src->tf.f = &src->f;
+    dst->tf.f = &dst->f;
+    ret = ff_thread_ref_frame(&dst->tf, &src->tf);
+    if (ret < 0)
+        goto fail;
+
+
+    dst->qscale_table_buf = av_buffer_ref(src->qscale_table_buf);
+    dst->mb_type_buf      = av_buffer_ref(src->mb_type_buf);
+    if (!dst->qscale_table_buf || !dst->mb_type_buf)
+        goto fail;
+    dst->qscale_table = src->qscale_table;
+    dst->mb_type      = src->mb_type;
+
+    for (i = 0; i < 2; i ++) {
+        dst->motion_val_buf[i] = av_buffer_ref(src->motion_val_buf[i]);
+        dst->ref_index_buf[i]  = av_buffer_ref(src->ref_index_buf[i]);
+        if (!dst->motion_val_buf[i] || !dst->ref_index_buf[i])
+            goto fail;
+        dst->motion_val[i] = src->motion_val[i];
+        dst->ref_index[i]  = src->ref_index[i];
+    }
+
+    if (src->hwaccel_picture_private) {
+        dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
+        if (!dst->hwaccel_priv_buf)
+            goto fail;
+        dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
+    }
+
+    for (i = 0; i < 2; i++)
+        dst->field_poc[i] = src->field_poc[i];
+
+    memcpy(dst->ref_poc,   src->ref_poc,   sizeof(src->ref_poc));
+    memcpy(dst->ref_count, src->ref_count, sizeof(src->ref_count));
+
+    dst->poc                     = src->poc;
+    dst->frame_num               = src->frame_num;
+    dst->mmco_reset              = src->mmco_reset;
+    dst->pic_id                  = src->pic_id;
+    dst->long_ref                = src->long_ref;
+    dst->mbaff                   = src->mbaff;
+    dst->field_picture           = src->field_picture;
+    dst->needs_realloc           = src->needs_realloc;
+    dst->reference               = src->reference;
+    dst->sync                    = src->sync;
+    dst->crop                    = src->crop;
+    dst->crop_left               = src->crop_left;
+    dst->crop_top                = src->crop_top;
+
+    return 0;
+fail:
+    unref_picture(h, dst);
+    return ret;
+}
+
+
+static int alloc_scratch_buffers(H264Context *h, int linesize)
+{
+    int alloc_size = FFALIGN(FFABS(linesize) + 32, 32);
+
+    if (h->bipred_scratchpad)
+        return 0;
+
+    h->bipred_scratchpad = av_malloc(16 * 6 * alloc_size);
+    // edge emu needs blocksize + filter length - 1
+    // (= 21x21 for  h264)
+    h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 21);
+    h->me.scratchpad   = av_mallocz(alloc_size * 2 * 16 * 2);
+
+    if (!h->bipred_scratchpad || !h->edge_emu_buffer || !h->me.scratchpad) {
+        av_freep(&h->bipred_scratchpad);
+        av_freep(&h->edge_emu_buffer);
+        av_freep(&h->me.scratchpad);
+        return AVERROR(ENOMEM);
+    }
+
+    h->me.temp = h->me.scratchpad;
+
+    return 0;
+}
+
+static int init_table_pools(H264Context *h)
+{
+    const int big_mb_num    = h->mb_stride * (h->mb_height + 1) + 1;
+    const int mb_array_size = h->mb_stride * h->mb_height;
+    const int b4_stride     = h->mb_width * 4 + 1;
+    const int b4_array_size = b4_stride * h->mb_height * 4;
+
+    h->qscale_table_pool = av_buffer_pool_init(big_mb_num + h->mb_stride,
+                                               av_buffer_allocz);
+    h->mb_type_pool      = av_buffer_pool_init((big_mb_num + h->mb_stride) *
+                                               sizeof(uint32_t), av_buffer_allocz);
+    h->motion_val_pool = av_buffer_pool_init(2 * (b4_array_size + 4) *
+                                             sizeof(int16_t), av_buffer_allocz);
+    h->ref_index_pool  = av_buffer_pool_init(4 * mb_array_size, av_buffer_allocz);
+
+    if (!h->qscale_table_pool || !h->mb_type_pool || !h->motion_val_pool ||
+        !h->ref_index_pool) {
+        av_buffer_pool_uninit(&h->qscale_table_pool);
+        av_buffer_pool_uninit(&h->mb_type_pool);
+        av_buffer_pool_uninit(&h->motion_val_pool);
+        av_buffer_pool_uninit(&h->ref_index_pool);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int alloc_picture(H264Context *h, Picture *pic)
+{
+    int i, ret = 0;
+
+    av_assert0(!pic->f.data[0]);
+
+    pic->tf.f = &pic->f;
+    ret = ff_thread_get_buffer(h->avctx, &pic->tf, pic->reference ?
+                                                   AV_GET_BUFFER_FLAG_REF : 0);
+    if (ret < 0)
+        goto fail;
+
+    h->linesize   = pic->f.linesize[0];
+    h->uvlinesize = pic->f.linesize[1];
+    pic->crop     = h->sps.crop;
+    pic->crop_top = h->sps.crop_top;
+    pic->crop_left= h->sps.crop_left;
+
+    if (h->avctx->hwaccel) {
+        const AVHWAccel *hwaccel = h->avctx->hwaccel;
+        av_assert0(!pic->hwaccel_picture_private);
+        if (hwaccel->priv_data_size) {
+            pic->hwaccel_priv_buf = av_buffer_allocz(hwaccel->priv_data_size);
+            if (!pic->hwaccel_priv_buf)
+                return AVERROR(ENOMEM);
+            pic->hwaccel_picture_private = pic->hwaccel_priv_buf->data;
+        }
+    }
+
+    if (!h->qscale_table_pool) {
+        ret = init_table_pools(h);
+        if (ret < 0)
+            goto fail;
+    }
+
+    pic->qscale_table_buf = av_buffer_pool_get(h->qscale_table_pool);
+    pic->mb_type_buf      = av_buffer_pool_get(h->mb_type_pool);
+    if (!pic->qscale_table_buf || !pic->mb_type_buf)
+        goto fail;
+
+    pic->mb_type      = (uint32_t*)pic->mb_type_buf->data + 2 * h->mb_stride + 1;
+    pic->qscale_table = pic->qscale_table_buf->data + 2 * h->mb_stride + 1;
+
+    for (i = 0; i < 2; i++) {
+        pic->motion_val_buf[i] = av_buffer_pool_get(h->motion_val_pool);
+        pic->ref_index_buf[i]  = av_buffer_pool_get(h->ref_index_pool);
+        if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
+            goto fail;
+
+        pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
+        pic->ref_index[i]  = pic->ref_index_buf[i]->data;
+    }
+
+    return 0;
+fail:
+    unref_picture(h, pic);
+    return (ret < 0) ? ret : AVERROR(ENOMEM);
+}
+
+static inline int pic_is_unused(H264Context *h, Picture *pic)
+{
+    if (pic->f.data[0] == NULL)
+        return 1;
+    if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
+        return 1;
+    return 0;
+}
+
+static int find_unused_picture(H264Context *h)
+{
+    int i;
+
+    for (i = 0; i < MAX_PICTURE_COUNT; i++) {
+        if (pic_is_unused(h, &h->DPB[i]))
+            break;
+    }
+    if (i == MAX_PICTURE_COUNT)
+        return AVERROR_INVALIDDATA;
+
+    if (h->DPB[i].needs_realloc) {
+        h->DPB[i].needs_realloc = 0;
+        unref_picture(h, &h->DPB[i]);
+    }
+
+    return i;
+}
+
+/**
+ * Check if the top & left blocks are available if needed and
+ * change the dc mode so it only uses the available blocks.
+ */
+int ff_h264_check_intra4x4_pred_mode(H264Context *h)
+{
+    static const int8_t top[12] = {
+        -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
+    };
+    static const int8_t left[12] = {
+        0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
+    };
+    int i;
+
+    if (!(h->top_samples_available & 0x8000)) {
+        for (i = 0; i < 4; i++) {
+            int status = top[h->intra4x4_pred_mode_cache[scan8[0] + i]];
+            if (status < 0) {
+                av_log(h->avctx, AV_LOG_ERROR,
+                       "top block unavailable for requested intra4x4 mode %d at %d %d\n",
+                       status, h->mb_x, h->mb_y);
+                return -1;
+            } else if (status) {
+                h->intra4x4_pred_mode_cache[scan8[0] + i] = status;
+            }
+        }
+    }
+
+    if ((h->left_samples_available & 0x8888) != 0x8888) {
+        static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
+        for (i = 0; i < 4; i++)
+            if (!(h->left_samples_available & mask[i])) {
+                int status = left[h->intra4x4_pred_mode_cache[scan8[0] + 8 * i]];
+                if (status < 0) {
+                    av_log(h->avctx, AV_LOG_ERROR,
+                           "left block unavailable for requested intra4x4 mode %d at %d %d\n",
+                           status, h->mb_x, h->mb_y);
+                    return -1;
+                } else if (status) {
+                    h->intra4x4_pred_mode_cache[scan8[0] + 8 * i] = status;
+                }
+            }
+    }
+
+    return 0;
+} // FIXME cleanup like ff_h264_check_intra_pred_mode
+
+/**
+ * Check if the top & left blocks are available if needed and
+ * change the dc mode so it only uses the available blocks.
+ */
+int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma)
+{
+    static const int8_t top[7]  = { LEFT_DC_PRED8x8, 1, -1, -1 };
+    static const int8_t left[7] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
+
+    if (mode > 6U) {
+        av_log(h->avctx, AV_LOG_ERROR,
+               "out of range intra chroma pred mode at %d %d\n",
+               h->mb_x, h->mb_y);
+        return -1;
+    }
+
+    if (!(h->top_samples_available & 0x8000)) {
+        mode = top[mode];
+        if (mode < 0) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "top block unavailable for requested intra mode at %d %d\n",
+                   h->mb_x, h->mb_y);
+            return -1;
+        }
+    }
+
+    if ((h->left_samples_available & 0x8080) != 0x8080) {
+        mode = left[mode];
+        if (is_chroma && (h->left_samples_available & 0x8080)) {
+            // mad cow disease mode, aka MBAFF + constrained_intra_pred
+            mode = ALZHEIMER_DC_L0T_PRED8x8 +
+                   (!(h->left_samples_available & 0x8000)) +
+                   2 * (mode == DC_128_PRED8x8);
+        }
+        if (mode < 0) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "left block unavailable for requested intra mode at %d %d\n",
+                   h->mb_x, h->mb_y);
+            return -1;
+        }
+    }
+
+    return mode;
+}
+
+const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
+                                  int *dst_length, int *consumed, int length)
+{
+    int i, si, di;
+    uint8_t *dst;
+    int bufidx;
+
+    // src[0]&0x80; // forbidden bit
+    h->nal_ref_idc   = src[0] >> 5;
+    h->nal_unit_type = src[0] & 0x1F;
+
+    src++;
+    length--;
+
+#define STARTCODE_TEST                                                  \
+        if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) {     \
+            if (src[i + 2] != 3) {                                      \
+                /* startcode, so we must be past the end */             \
+                length = i;                                             \
+            }                                                           \
+            break;                                                      \
+        }
+#if HAVE_FAST_UNALIGNED
+#define FIND_FIRST_ZERO                                                 \
+        if (i > 0 && !src[i])                                           \
+            i--;                                                        \
+        while (src[i])                                                  \
+            i++
+#if HAVE_FAST_64BIT
+    for (i = 0; i + 1 < length; i += 9) {
+        if (!((~AV_RN64A(src + i) &
+               (AV_RN64A(src + i) - 0x0100010001000101ULL)) &
+              0x8000800080008080ULL))
+            continue;
+        FIND_FIRST_ZERO;
+        STARTCODE_TEST;
+        i -= 7;
+    }
+#else
+    for (i = 0; i + 1 < length; i += 5) {
+        if (!((~AV_RN32A(src + i) &
+               (AV_RN32A(src + i) - 0x01000101U)) &
+              0x80008080U))
+            continue;
+        FIND_FIRST_ZERO;
+        STARTCODE_TEST;
+        i -= 3;
+    }
+#endif
+#else
+    for (i = 0; i + 1 < length; i += 2) {
+        if (src[i])
+            continue;
+        if (i > 0 && src[i - 1] == 0)
+            i--;
+        STARTCODE_TEST;
+    }
+#endif
+
+    // use second escape buffer for inter data
+    bufidx = h->nal_unit_type == NAL_DPC ? 1 : 0;
+
+    si = h->rbsp_buffer_size[bufidx];
+    av_fast_padded_malloc(&h->rbsp_buffer[bufidx], &h->rbsp_buffer_size[bufidx], length+MAX_MBPAIR_SIZE);
+    dst = h->rbsp_buffer[bufidx];
+
+    if (dst == NULL)
+        return NULL;
+
+    if(i>=length-1){ //no escaped 0
+        *dst_length= length;
+        *consumed= length+1; //+1 for the header
+        if(h->avctx->flags2 & CODEC_FLAG2_FAST){
+            return src;
+        }else{
+            memcpy(dst, src, length);
+            return dst;
+        }
+    }
+
+    memcpy(dst, src, i);
+    si = di = i;
+    while (si + 2 < length) {
+        // remove escapes (very rare 1:2^22)
+        if (src[si + 2] > 3) {
+            dst[di++] = src[si++];
+            dst[di++] = src[si++];
+        } else if (src[si] == 0 && src[si + 1] == 0) {
+            if (src[si + 2] == 3) { // escape
+                dst[di++]  = 0;
+                dst[di++]  = 0;
+                si        += 3;
+                continue;
+            } else // next start code
+                goto nsc;
+        }
+
+        dst[di++] = src[si++];
+    }
+    while (si < length)
+        dst[di++] = src[si++];
+nsc:
+
+    memset(dst + di, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
+    *dst_length = di;
+    *consumed   = si + 1; // +1 for the header
+    /* FIXME store exact number of bits in the getbitcontext
+     * (it is needed for decoding) */
+    return dst;
+}
+
+/**
+ * Identify the exact end of the bitstream
+ * @return the length of the trailing, or 0 if damaged
+ */
+static int decode_rbsp_trailing(H264Context *h, const uint8_t *src)
+{
+    int v = *src;
+    int r;
+
+    tprintf(h->avctx, "rbsp trailing %X\n", v);
+
+    for (r = 1; r < 9; r++) {
+        if (v & 1)
+            return r;
+        v >>= 1;
+    }
+    return 0;
+}
+
+static inline int get_lowest_part_list_y(H264Context *h, Picture *pic, int n,
+                                         int height, int y_offset, int list)
+{
+    int raw_my        = h->mv_cache[list][scan8[n]][1];
+    int filter_height_down = (raw_my & 3) ? 3 : 0;
+    int full_my       = (raw_my >> 2) + y_offset;
+    int bottom        = full_my + filter_height_down + height;
+
+    av_assert2(height >= 0);
+
+    return FFMAX(0, bottom);
+}
+
+static inline void get_lowest_part_y(H264Context *h, int refs[2][48], int n,
+                                     int height, int y_offset, int list0,
+                                     int list1, int *nrefs)
+{
+    int my;
+
+    y_offset += 16 * (h->mb_y >> MB_FIELD(h));
+
+    if (list0) {
+        int ref_n    = h->ref_cache[0][scan8[n]];
+        Picture *ref = &h->ref_list[0][ref_n];
+
+        // Error resilience puts the current picture in the ref list.
+        // Don't try to wait on these as it will cause a deadlock.
+        // Fields can wait on each other, though.
+        if (ref->tf.progress->data   != h->cur_pic.tf.progress->data ||
+            (ref->reference & 3) != h->picture_structure) {
+            my = get_lowest_part_list_y(h, ref, n, height, y_offset, 0);
+            if (refs[0][ref_n] < 0)
+                nrefs[0] += 1;
+            refs[0][ref_n] = FFMAX(refs[0][ref_n], my);
+        }
+    }
+
+    if (list1) {
+        int ref_n    = h->ref_cache[1][scan8[n]];
+        Picture *ref = &h->ref_list[1][ref_n];
+
+        if (ref->tf.progress->data != h->cur_pic.tf.progress->data ||
+            (ref->reference & 3) != h->picture_structure) {
+            my = get_lowest_part_list_y(h, ref, n, height, y_offset, 1);
+            if (refs[1][ref_n] < 0)
+                nrefs[1] += 1;
+            refs[1][ref_n] = FFMAX(refs[1][ref_n], my);
+        }
+    }
+}
+
+/**
+ * Wait until all reference frames are available for MC operations.
+ *
+ * @param h the H264 context
+ */
+static void await_references(H264Context *h)
+{
+    const int mb_xy   = h->mb_xy;
+    const int mb_type = h->cur_pic.mb_type[mb_xy];
+    int refs[2][48];
+    int nrefs[2] = { 0 };
+    int ref, list;
+
+    memset(refs, -1, sizeof(refs));
+
+    if (IS_16X16(mb_type)) {
+        get_lowest_part_y(h, refs, 0, 16, 0,
+                          IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
+    } else if (IS_16X8(mb_type)) {
+        get_lowest_part_y(h, refs, 0, 8, 0,
+                          IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
+        get_lowest_part_y(h, refs, 8, 8, 8,
+                          IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1), nrefs);
+    } else if (IS_8X16(mb_type)) {
+        get_lowest_part_y(h, refs, 0, 16, 0,
+                          IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
+        get_lowest_part_y(h, refs, 4, 16, 0,
+                          IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1), nrefs);
+    } else {
+        int i;
+
+        av_assert2(IS_8X8(mb_type));
+
+        for (i = 0; i < 4; i++) {
+            const int sub_mb_type = h->sub_mb_type[i];
+            const int n           = 4 * i;
+            int y_offset          = (i & 2) << 2;
+
+            if (IS_SUB_8X8(sub_mb_type)) {
+                get_lowest_part_y(h, refs, n, 8, y_offset,
+                                  IS_DIR(sub_mb_type, 0, 0),
+                                  IS_DIR(sub_mb_type, 0, 1),
+                                  nrefs);
+            } else if (IS_SUB_8X4(sub_mb_type)) {
+                get_lowest_part_y(h, refs, n, 4, y_offset,
+                                  IS_DIR(sub_mb_type, 0, 0),
+                                  IS_DIR(sub_mb_type, 0, 1),
+                                  nrefs);
+                get_lowest_part_y(h, refs, n + 2, 4, y_offset + 4,
+                                  IS_DIR(sub_mb_type, 0, 0),
+                                  IS_DIR(sub_mb_type, 0, 1),
+                                  nrefs);
+            } else if (IS_SUB_4X8(sub_mb_type)) {
+                get_lowest_part_y(h, refs, n, 8, y_offset,
+                                  IS_DIR(sub_mb_type, 0, 0),
+                                  IS_DIR(sub_mb_type, 0, 1),
+                                  nrefs);
+                get_lowest_part_y(h, refs, n + 1, 8, y_offset,
+                                  IS_DIR(sub_mb_type, 0, 0),
+                                  IS_DIR(sub_mb_type, 0, 1),
+                                  nrefs);
+            } else {
+                int j;
+                av_assert2(IS_SUB_4X4(sub_mb_type));
+                for (j = 0; j < 4; j++) {
+                    int sub_y_offset = y_offset + 2 * (j & 2);
+                    get_lowest_part_y(h, refs, n + j, 4, sub_y_offset,
+                                      IS_DIR(sub_mb_type, 0, 0),
+                                      IS_DIR(sub_mb_type, 0, 1),
+                                      nrefs);
+                }
+            }
+        }
+    }
+
+    for (list = h->list_count - 1; list >= 0; list--)
+        for (ref = 0; ref < 48 && nrefs[list]; ref++) {
+            int row = refs[list][ref];
+            if (row >= 0) {
+                Picture *ref_pic      = &h->ref_list[list][ref];
+                int ref_field         = ref_pic->reference - 1;
+                int ref_field_picture = ref_pic->field_picture;
+                int pic_height        = 16 * h->mb_height >> ref_field_picture;
+
+                row <<= MB_MBAFF(h);
+                nrefs[list]--;
+
+                if (!FIELD_PICTURE(h) && ref_field_picture) { // frame referencing two fields
+                    ff_thread_await_progress(&ref_pic->tf,
+                                             FFMIN((row >> 1) - !(row & 1),
+                                                   pic_height - 1),
+                                             1);
+                    ff_thread_await_progress(&ref_pic->tf,
+                                             FFMIN((row >> 1), pic_height - 1),
+                                             0);
+                } else if (FIELD_PICTURE(h) && !ref_field_picture) { // field referencing one field of a frame
+                    ff_thread_await_progress(&ref_pic->tf,
+                                             FFMIN(row * 2 + ref_field,
+                                                   pic_height - 1),
+                                             0);
+                } else if (FIELD_PICTURE(h)) {
+                    ff_thread_await_progress(&ref_pic->tf,
+                                             FFMIN(row, pic_height - 1),
+                                             ref_field);
+                } else {
+                    ff_thread_await_progress(&ref_pic->tf,
+                                             FFMIN(row, pic_height - 1),
+                                             0);
+                }
+            }
+        }
+}
+
+static av_always_inline void mc_dir_part(H264Context *h, Picture *pic,
+                                         int n, int square, int height,
+                                         int delta, int list,
+                                         uint8_t *dest_y, uint8_t *dest_cb,
+                                         uint8_t *dest_cr,
+                                         int src_x_offset, int src_y_offset,
+                                         qpel_mc_func *qpix_op,
+                                         h264_chroma_mc_func chroma_op,
+                                         int pixel_shift, int chroma_idc)
+{
+    const int mx      = h->mv_cache[list][scan8[n]][0] + src_x_offset * 8;
+    int my            = h->mv_cache[list][scan8[n]][1] + src_y_offset * 8;
+    const int luma_xy = (mx & 3) + ((my & 3) << 2);
+    int offset        = ((mx >> 2) << pixel_shift) + (my >> 2) * h->mb_linesize;
+    uint8_t *src_y    = pic->f.data[0] + offset;
+    uint8_t *src_cb, *src_cr;
+    int extra_width  = 0;
+    int extra_height = 0;
+    int emu = 0;
+    const int full_mx    = mx >> 2;
+    const int full_my    = my >> 2;
+    const int pic_width  = 16 * h->mb_width;
+    const int pic_height = 16 * h->mb_height >> MB_FIELD(h);
+    int ysh;
+
+    if (mx & 7)
+        extra_width -= 3;
+    if (my & 7)
+        extra_height -= 3;
+
+    if (full_mx                <          0 - extra_width  ||
+        full_my                <          0 - extra_height ||
+        full_mx + 16 /*FIXME*/ > pic_width  + extra_width  ||
+        full_my + 16 /*FIXME*/ > pic_height + extra_height) {
+        h->vdsp.emulated_edge_mc(h->edge_emu_buffer,
+                                 src_y - (2 << pixel_shift) - 2 * h->mb_linesize,
+                                 h->mb_linesize,
+                                 16 + 5, 16 + 5 /*FIXME*/, full_mx - 2,
+                                 full_my - 2, pic_width, pic_height);
+        src_y = h->edge_emu_buffer + (2 << pixel_shift) + 2 * h->mb_linesize;
+        emu   = 1;
+    }
+
+    qpix_op[luma_xy](dest_y, src_y, h->mb_linesize); // FIXME try variable height perhaps?
+    if (!square)
+        qpix_op[luma_xy](dest_y + delta, src_y + delta, h->mb_linesize);
+
+    if (CONFIG_GRAY && h->flags & CODEC_FLAG_GRAY)
+        return;
+
+    if (chroma_idc == 3 /* yuv444 */) {
+        src_cb = pic->f.data[1] + offset;
+        if (emu) {
+            h->vdsp.emulated_edge_mc(h->edge_emu_buffer,
+                                     src_cb - (2 << pixel_shift) - 2 * h->mb_linesize,
+                                     h->mb_linesize,
+                                     16 + 5, 16 + 5 /*FIXME*/,
+                                     full_mx - 2, full_my - 2,
+                                     pic_width, pic_height);
+            src_cb = h->edge_emu_buffer + (2 << pixel_shift) + 2 * h->mb_linesize;
+        }
+        qpix_op[luma_xy](dest_cb, src_cb, h->mb_linesize); // FIXME try variable height perhaps?
+        if (!square)
+            qpix_op[luma_xy](dest_cb + delta, src_cb + delta, h->mb_linesize);
+
+        src_cr = pic->f.data[2] + offset;
+        if (emu) {
+            h->vdsp.emulated_edge_mc(h->edge_emu_buffer,
+                                     src_cr - (2 << pixel_shift) - 2 * h->mb_linesize,
+                                     h->mb_linesize,
+                                     16 + 5, 16 + 5 /*FIXME*/,
+                                     full_mx - 2, full_my - 2,
+                                     pic_width, pic_height);
+            src_cr = h->edge_emu_buffer + (2 << pixel_shift) + 2 * h->mb_linesize;
+        }
+        qpix_op[luma_xy](dest_cr, src_cr, h->mb_linesize); // FIXME try variable height perhaps?
+        if (!square)
+            qpix_op[luma_xy](dest_cr + delta, src_cr + delta, h->mb_linesize);
+        return;
+    }
+
+    ysh = 3 - (chroma_idc == 2 /* yuv422 */);
+    if (chroma_idc == 1 /* yuv420 */ && MB_FIELD(h)) {
+        // chroma offset when predicting from a field of opposite parity
+        my  += 2 * ((h->mb_y & 1) - (pic->reference - 1));
+        emu |= (my >> 3) < 0 || (my >> 3) + 8 >= (pic_height >> 1);
+    }
+
+    src_cb = pic->f.data[1] + ((mx >> 3) << pixel_shift) +
+             (my >> ysh) * h->mb_uvlinesize;
+    src_cr = pic->f.data[2] + ((mx >> 3) << pixel_shift) +
+             (my >> ysh) * h->mb_uvlinesize;
+
+    if (emu) {
+        h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src_cb, h->mb_uvlinesize,
+                                 9, 8 * chroma_idc + 1, (mx >> 3), (my >> ysh),
+                                 pic_width >> 1, pic_height >> (chroma_idc == 1 /* yuv420 */));
+        src_cb = h->edge_emu_buffer;
+    }
+    chroma_op(dest_cb, src_cb, h->mb_uvlinesize,
+              height >> (chroma_idc == 1 /* yuv420 */),
+              mx & 7, (my << (chroma_idc == 2 /* yuv422 */)) & 7);
+
+    if (emu) {
+        h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src_cr, h->mb_uvlinesize,
+                                 9, 8 * chroma_idc + 1, (mx >> 3), (my >> ysh),
+                                 pic_width >> 1, pic_height >> (chroma_idc == 1 /* yuv420 */));
+        src_cr = h->edge_emu_buffer;
+    }
+    chroma_op(dest_cr, src_cr, h->mb_uvlinesize, height >> (chroma_idc == 1 /* yuv420 */),
+              mx & 7, (my << (chroma_idc == 2 /* yuv422 */)) & 7);
+}
+
+static av_always_inline void mc_part_std(H264Context *h, int n, int square,
+                                         int height, int delta,
+                                         uint8_t *dest_y, uint8_t *dest_cb,
+                                         uint8_t *dest_cr,
+                                         int x_offset, int y_offset,
+                                         qpel_mc_func *qpix_put,
+                                         h264_chroma_mc_func chroma_put,
+                                         qpel_mc_func *qpix_avg,
+                                         h264_chroma_mc_func chroma_avg,
+                                         int list0, int list1,
+                                         int pixel_shift, int chroma_idc)
+{
+    qpel_mc_func *qpix_op         = qpix_put;
+    h264_chroma_mc_func chroma_op = chroma_put;
+
+    dest_y += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
+    if (chroma_idc == 3 /* yuv444 */) {
+        dest_cb += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
+        dest_cr += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
+    } else if (chroma_idc == 2 /* yuv422 */) {
+        dest_cb += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
+        dest_cr += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
+    } else { /* yuv420 */
+        dest_cb += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
+        dest_cr += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
+    }
+    x_offset += 8 * h->mb_x;
+    y_offset += 8 * (h->mb_y >> MB_FIELD(h));
+
+    if (list0) {
+        Picture *ref = &h->ref_list[0][h->ref_cache[0][scan8[n]]];
+        mc_dir_part(h, ref, n, square, height, delta, 0,
+                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
+                    qpix_op, chroma_op, pixel_shift, chroma_idc);
+
+        qpix_op   = qpix_avg;
+        chroma_op = chroma_avg;
+    }
+
+    if (list1) {
+        Picture *ref = &h->ref_list[1][h->ref_cache[1][scan8[n]]];
+        mc_dir_part(h, ref, n, square, height, delta, 1,
+                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
+                    qpix_op, chroma_op, pixel_shift, chroma_idc);
+    }
+}
+
+static av_always_inline void mc_part_weighted(H264Context *h, int n, int square,
+                                              int height, int delta,
+                                              uint8_t *dest_y, uint8_t *dest_cb,
+                                              uint8_t *dest_cr,
+                                              int x_offset, int y_offset,
+                                              qpel_mc_func *qpix_put,
+                                              h264_chroma_mc_func chroma_put,
+                                              h264_weight_func luma_weight_op,
+                                              h264_weight_func chroma_weight_op,
+                                              h264_biweight_func luma_weight_avg,
+                                              h264_biweight_func chroma_weight_avg,
+                                              int list0, int list1,
+                                              int pixel_shift, int chroma_idc)
+{
+    int chroma_height;
+
+    dest_y += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
+    if (chroma_idc == 3 /* yuv444 */) {
+        chroma_height     = height;
+        chroma_weight_avg = luma_weight_avg;
+        chroma_weight_op  = luma_weight_op;
+        dest_cb += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
+        dest_cr += (2 * x_offset << pixel_shift) + 2 * y_offset * h->mb_linesize;
+    } else if (chroma_idc == 2 /* yuv422 */) {
+        chroma_height = height;
+        dest_cb      += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
+        dest_cr      += (x_offset << pixel_shift) + 2 * y_offset * h->mb_uvlinesize;
+    } else { /* yuv420 */
+        chroma_height = height >> 1;
+        dest_cb      += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
+        dest_cr      += (x_offset << pixel_shift) + y_offset * h->mb_uvlinesize;
+    }
+    x_offset += 8 * h->mb_x;
+    y_offset += 8 * (h->mb_y >> MB_FIELD(h));
+
+    if (list0 && list1) {
+        /* don't optimize for luma-only case, since B-frames usually
+         * use implicit weights => chroma too. */
+        uint8_t *tmp_cb = h->bipred_scratchpad;
+        uint8_t *tmp_cr = h->bipred_scratchpad + (16 << pixel_shift);
+        uint8_t *tmp_y  = h->bipred_scratchpad + 16 * h->mb_uvlinesize;
+        int refn0       = h->ref_cache[0][scan8[n]];
+        int refn1       = h->ref_cache[1][scan8[n]];
+
+        mc_dir_part(h, &h->ref_list[0][refn0], n, square, height, delta, 0,
+                    dest_y, dest_cb, dest_cr,
+                    x_offset, y_offset, qpix_put, chroma_put,
+                    pixel_shift, chroma_idc);
+        mc_dir_part(h, &h->ref_list[1][refn1], n, square, height, delta, 1,
+                    tmp_y, tmp_cb, tmp_cr,
+                    x_offset, y_offset, qpix_put, chroma_put,
+                    pixel_shift, chroma_idc);
+
+        if (h->use_weight == 2) {
+            int weight0 = h->implicit_weight[refn0][refn1][h->mb_y & 1];
+            int weight1 = 64 - weight0;
+            luma_weight_avg(dest_y, tmp_y, h->mb_linesize,
+                            height, 5, weight0, weight1, 0);
+            chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize,
+                              chroma_height, 5, weight0, weight1, 0);
+            chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize,
+                              chroma_height, 5, weight0, weight1, 0);
+        } else {
+            luma_weight_avg(dest_y, tmp_y, h->mb_linesize, height,
+                            h->luma_log2_weight_denom,
+                            h->luma_weight[refn0][0][0],
+                            h->luma_weight[refn1][1][0],
+                            h->luma_weight[refn0][0][1] +
+                            h->luma_weight[refn1][1][1]);
+            chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize, chroma_height,
+                              h->chroma_log2_weight_denom,
+                              h->chroma_weight[refn0][0][0][0],
+                              h->chroma_weight[refn1][1][0][0],
+                              h->chroma_weight[refn0][0][0][1] +
+                              h->chroma_weight[refn1][1][0][1]);
+            chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize, chroma_height,
+                              h->chroma_log2_weight_denom,
+                              h->chroma_weight[refn0][0][1][0],
+                              h->chroma_weight[refn1][1][1][0],
+                              h->chroma_weight[refn0][0][1][1] +
+                              h->chroma_weight[refn1][1][1][1]);
+        }
+    } else {
+        int list     = list1 ? 1 : 0;
+        int refn     = h->ref_cache[list][scan8[n]];
+        Picture *ref = &h->ref_list[list][refn];
+        mc_dir_part(h, ref, n, square, height, delta, list,
+                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
+                    qpix_put, chroma_put, pixel_shift, chroma_idc);
+
+        luma_weight_op(dest_y, h->mb_linesize, height,
+                       h->luma_log2_weight_denom,
+                       h->luma_weight[refn][list][0],
+                       h->luma_weight[refn][list][1]);
+        if (h->use_weight_chroma) {
+            chroma_weight_op(dest_cb, h->mb_uvlinesize, chroma_height,
+                             h->chroma_log2_weight_denom,
+                             h->chroma_weight[refn][list][0][0],
+                             h->chroma_weight[refn][list][0][1]);
+            chroma_weight_op(dest_cr, h->mb_uvlinesize, chroma_height,
+                             h->chroma_log2_weight_denom,
+                             h->chroma_weight[refn][list][1][0],
+                             h->chroma_weight[refn][list][1][1]);
+        }
+    }
+}
+
+static av_always_inline void prefetch_motion(H264Context *h, int list,
+                                             int pixel_shift, int chroma_idc)
+{
+    /* fetch pixels for estimated mv 4 macroblocks ahead
+     * optimized for 64byte cache lines */
+    const int refn = h->ref_cache[list][scan8[0]];
+    if (refn >= 0) {
+        const int mx  = (h->mv_cache[list][scan8[0]][0] >> 2) + 16 * h->mb_x + 8;
+        const int my  = (h->mv_cache[list][scan8[0]][1] >> 2) + 16 * h->mb_y;
+        uint8_t **src = h->ref_list[list][refn].f.data;
+        int off       = (mx << pixel_shift) +
+                        (my + (h->mb_x & 3) * 4) * h->mb_linesize +
+                        (64 << pixel_shift);
+        h->vdsp.prefetch(src[0] + off, h->linesize, 4);
+        if (chroma_idc == 3 /* yuv444 */) {
+            h->vdsp.prefetch(src[1] + off, h->linesize, 4);
+            h->vdsp.prefetch(src[2] + off, h->linesize, 4);
+        } else {
+            off= (((mx>>1)+64)<<pixel_shift) + ((my>>1) + (h->mb_x&7))*h->uvlinesize;
+            h->vdsp.prefetch(src[1] + off, src[2] - src[1], 2);
+        }
+    }
+}
+
+static void free_tables(H264Context *h, int free_rbsp)
+{
+    int i;
+    H264Context *hx;
+
+    av_freep(&h->intra4x4_pred_mode);
+    av_freep(&h->chroma_pred_mode_table);
+    av_freep(&h->cbp_table);
+    av_freep(&h->mvd_table[0]);
+    av_freep(&h->mvd_table[1]);
+    av_freep(&h->direct_table);
+    av_freep(&h->non_zero_count);
+    av_freep(&h->slice_table_base);
+    h->slice_table = NULL;
+    av_freep(&h->list_counts);
+
+    av_freep(&h->mb2b_xy);
+    av_freep(&h->mb2br_xy);
+
+    for (i = 0; i < 3; i++)
+        av_freep(&h->visualization_buffer[i]);
+
+    av_buffer_pool_uninit(&h->qscale_table_pool);
+    av_buffer_pool_uninit(&h->mb_type_pool);
+    av_buffer_pool_uninit(&h->motion_val_pool);
+    av_buffer_pool_uninit(&h->ref_index_pool);
+
+    if (free_rbsp && h->DPB) {
+        for (i = 0; i < MAX_PICTURE_COUNT; i++)
+            unref_picture(h, &h->DPB[i]);
+        av_freep(&h->DPB);
+    } else if (h->DPB) {
+        for (i = 0; i < MAX_PICTURE_COUNT; i++)
+            h->DPB[i].needs_realloc = 1;
+    }
+
+    h->cur_pic_ptr = NULL;
+
+    for (i = 0; i < MAX_THREADS; i++) {
+        hx = h->thread_context[i];
+        if (!hx)
+            continue;
+        av_freep(&hx->top_borders[1]);
+        av_freep(&hx->top_borders[0]);
+        av_freep(&hx->bipred_scratchpad);
+        av_freep(&hx->edge_emu_buffer);
+        av_freep(&hx->dc_val_base);
+        av_freep(&hx->me.scratchpad);
+        av_freep(&hx->er.mb_index2xy);
+        av_freep(&hx->er.error_status_table);
+        av_freep(&hx->er.er_temp_buffer);
+        av_freep(&hx->er.mbintra_table);
+        av_freep(&hx->er.mbskip_table);
+
+        if (free_rbsp) {
+            av_freep(&hx->rbsp_buffer[1]);
+            av_freep(&hx->rbsp_buffer[0]);
+            hx->rbsp_buffer_size[0] = 0;
+            hx->rbsp_buffer_size[1] = 0;
+        }
+        if (i)
+            av_freep(&h->thread_context[i]);
+    }
+}
+
+static void init_dequant8_coeff_table(H264Context *h)
+{
+    int i, j, q, x;
+    const int max_qp = 51 + 6 * (h->sps.bit_depth_luma - 8);
+
+    for (i = 0; i < 6; i++) {
+        h->dequant8_coeff[i] = h->dequant8_buffer[i];
+        for (j = 0; j < i; j++)
+            if (!memcmp(h->pps.scaling_matrix8[j], h->pps.scaling_matrix8[i],
+                        64 * sizeof(uint8_t))) {
+                h->dequant8_coeff[i] = h->dequant8_buffer[j];
+                break;
+            }
+        if (j < i)
+            continue;
+
+        for (q = 0; q < max_qp + 1; q++) {
+            int shift = div6[q];
+            int idx   = rem6[q];
+            for (x = 0; x < 64; x++)
+                h->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =
+                    ((uint32_t)dequant8_coeff_init[idx][dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *
+                     h->pps.scaling_matrix8[i][x]) << shift;
+        }
+    }
+}
+
+static void init_dequant4_coeff_table(H264Context *h)
+{
+    int i, j, q, x;
+    const int max_qp = 51 + 6 * (h->sps.bit_depth_luma - 8);
+    for (i = 0; i < 6; i++) {
+        h->dequant4_coeff[i] = h->dequant4_buffer[i];
+        for (j = 0; j < i; j++)
+            if (!memcmp(h->pps.scaling_matrix4[j], h->pps.scaling_matrix4[i],
+                        16 * sizeof(uint8_t))) {
+                h->dequant4_coeff[i] = h->dequant4_buffer[j];
+                break;
+            }
+        if (j < i)
+            continue;
+
+        for (q = 0; q < max_qp + 1; q++) {
+            int shift = div6[q] + 2;
+            int idx   = rem6[q];
+            for (x = 0; x < 16; x++)
+                h->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =
+                    ((uint32_t)dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *
+                     h->pps.scaling_matrix4[i][x]) << shift;
+        }
+    }
+}
+
+static void init_dequant_tables(H264Context *h)
+{
+    int i, x;
+    init_dequant4_coeff_table(h);
+    if (h->pps.transform_8x8_mode)
+        init_dequant8_coeff_table(h);
+    if (h->sps.transform_bypass) {
+        for (i = 0; i < 6; i++)
+            for (x = 0; x < 16; x++)
+                h->dequant4_coeff[i][0][x] = 1 << 6;
+        if (h->pps.transform_8x8_mode)
+            for (i = 0; i < 6; i++)
+                for (x = 0; x < 64; x++)
+                    h->dequant8_coeff[i][0][x] = 1 << 6;
+    }
+}
+
+int ff_h264_alloc_tables(H264Context *h)
+{
+    const int big_mb_num    = h->mb_stride * (h->mb_height + 1);
+    const int row_mb_num    = 2*h->mb_stride*FFMAX(h->avctx->thread_count, 1);
+    int x, y, i;
+
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->intra4x4_pred_mode,
+                      row_mb_num * 8 * sizeof(uint8_t), fail)
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->non_zero_count,
+                      big_mb_num * 48 * sizeof(uint8_t), fail)
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->slice_table_base,
+                      (big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base), fail)
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->cbp_table,
+                      big_mb_num * sizeof(uint16_t), fail)
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->chroma_pred_mode_table,
+                      big_mb_num * sizeof(uint8_t), fail)
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->mvd_table[0],
+                      16 * row_mb_num * sizeof(uint8_t), fail);
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->mvd_table[1],
+                      16 * row_mb_num * sizeof(uint8_t), fail);
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->direct_table,
+                      4 * big_mb_num * sizeof(uint8_t), fail);
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->list_counts,
+                      big_mb_num * sizeof(uint8_t), fail)
+
+    memset(h->slice_table_base, -1,
+           (big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base));
+    h->slice_table = h->slice_table_base + h->mb_stride * 2 + 1;
+
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2b_xy,
+                      big_mb_num * sizeof(uint32_t), fail);
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2br_xy,
+                      big_mb_num * sizeof(uint32_t), fail);
+    for (y = 0; y < h->mb_height; y++)
+        for (x = 0; x < h->mb_width; x++) {
+            const int mb_xy = x + y * h->mb_stride;
+            const int b_xy  = 4 * x + 4 * y * h->b_stride;
+
+            h->mb2b_xy[mb_xy]  = b_xy;
+            h->mb2br_xy[mb_xy] = 8 * (FMO ? mb_xy : (mb_xy % (2 * h->mb_stride)));
+        }
+
+    if (!h->dequant4_coeff[0])
+        init_dequant_tables(h);
+
+    if (!h->DPB) {
+        h->DPB = av_mallocz_array(MAX_PICTURE_COUNT, sizeof(*h->DPB));
+        if (!h->DPB)
+            return AVERROR(ENOMEM);
+        for (i = 0; i < MAX_PICTURE_COUNT; i++)
+            avcodec_get_frame_defaults(&h->DPB[i].f);
+        avcodec_get_frame_defaults(&h->cur_pic.f);
+    }
+
+    return 0;
+
+fail:
+    free_tables(h, 1);
+    return -1;
+}
+
+/**
+ * Mimic alloc_tables(), but for every context thread.
+ */
+static void clone_tables(H264Context *dst, H264Context *src, int i)
+{
+    dst->intra4x4_pred_mode     = src->intra4x4_pred_mode + i * 8 * 2 * src->mb_stride;
+    dst->non_zero_count         = src->non_zero_count;
+    dst->slice_table            = src->slice_table;
+    dst->cbp_table              = src->cbp_table;
+    dst->mb2b_xy                = src->mb2b_xy;
+    dst->mb2br_xy               = src->mb2br_xy;
+    dst->chroma_pred_mode_table = src->chroma_pred_mode_table;
+    dst->mvd_table[0]           = src->mvd_table[0] + i * 8 * 2 * src->mb_stride;
+    dst->mvd_table[1]           = src->mvd_table[1] + i * 8 * 2 * src->mb_stride;
+    dst->direct_table           = src->direct_table;
+    dst->list_counts            = src->list_counts;
+    dst->DPB                    = src->DPB;
+    dst->cur_pic_ptr            = src->cur_pic_ptr;
+    dst->cur_pic                = src->cur_pic;
+    dst->bipred_scratchpad      = NULL;
+    dst->edge_emu_buffer        = NULL;
+    dst->me.scratchpad          = NULL;
+    ff_h264_pred_init(&dst->hpc, src->avctx->codec_id, src->sps.bit_depth_luma,
+                      src->sps.chroma_format_idc);
+}
+
+/**
+ * Init context
+ * Allocate buffers which are not shared amongst multiple threads.
+ */
+static int context_init(H264Context *h)
+{
+    ERContext *er = &h->er;
+    int mb_array_size = h->mb_height * h->mb_stride;
+    int y_size  = (2 * h->mb_width + 1) * (2 * h->mb_height + 1);
+    int c_size  = h->mb_stride * (h->mb_height + 1);
+    int yc_size = y_size + 2   * c_size;
+    int x, y, i;
+
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->top_borders[0],
+                      h->mb_width * 16 * 3 * sizeof(uint8_t) * 2, fail)
+    FF_ALLOCZ_OR_GOTO(h->avctx, h->top_borders[1],
+                      h->mb_width * 16 * 3 * sizeof(uint8_t) * 2, fail)
+
+    h->ref_cache[0][scan8[5]  + 1] =
+    h->ref_cache[0][scan8[7]  + 1] =
+    h->ref_cache[0][scan8[13] + 1] =
+    h->ref_cache[1][scan8[5]  + 1] =
+    h->ref_cache[1][scan8[7]  + 1] =
+    h->ref_cache[1][scan8[13] + 1] = PART_NOT_AVAILABLE;
+
+    if (CONFIG_ERROR_RESILIENCE) {
+        /* init ER */
+        er->avctx          = h->avctx;
+        er->dsp            = &h->dsp;
+        er->decode_mb      = h264_er_decode_mb;
+        er->opaque         = h;
+        er->quarter_sample = 1;
+
+        er->mb_num      = h->mb_num;
+        er->mb_width    = h->mb_width;
+        er->mb_height   = h->mb_height;
+        er->mb_stride   = h->mb_stride;
+        er->b8_stride   = h->mb_width * 2 + 1;
+
+        FF_ALLOCZ_OR_GOTO(h->avctx, er->mb_index2xy, (h->mb_num + 1) * sizeof(int),
+                          fail); // error ressilience code looks cleaner with this
+        for (y = 0; y < h->mb_height; y++)
+            for (x = 0; x < h->mb_width; x++)
+                er->mb_index2xy[x + y * h->mb_width] = x + y * h->mb_stride;
+
+        er->mb_index2xy[h->mb_height * h->mb_width] = (h->mb_height - 1) *
+                                                       h->mb_stride + h->mb_width;
+
+        FF_ALLOCZ_OR_GOTO(h->avctx, er->error_status_table,
+                          mb_array_size * sizeof(uint8_t), fail);
+
+        FF_ALLOC_OR_GOTO(h->avctx, er->mbintra_table, mb_array_size, fail);
+        memset(er->mbintra_table, 1, mb_array_size);
+
+        FF_ALLOCZ_OR_GOTO(h->avctx, er->mbskip_table, mb_array_size + 2, fail);
+
+        FF_ALLOC_OR_GOTO(h->avctx, er->er_temp_buffer, h->mb_height * h->mb_stride,
+                         fail);
+
+        FF_ALLOCZ_OR_GOTO(h->avctx, h->dc_val_base, yc_size * sizeof(int16_t), fail);
+        er->dc_val[0] = h->dc_val_base + h->mb_width * 2 + 2;
+        er->dc_val[1] = h->dc_val_base + y_size + h->mb_stride + 1;
+        er->dc_val[2] = er->dc_val[1] + c_size;
+        for (i = 0; i < yc_size; i++)
+            h->dc_val_base[i] = 1024;
+    }
+
+    return 0;
+
+fail:
+    return -1; // free_tables will clean up for us
+}
+
+static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
+                            int parse_extradata);
+
+int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size)
+{
+    AVCodecContext *avctx = h->avctx;
+
+    if (!buf || size <= 0)
+        return -1;
+
+    if (buf[0] == 1) {
+        int i, cnt, nalsize;
+        const unsigned char *p = buf;
+
+        h->is_avc = 1;
+
+        if (size < 7) {
+            av_log(avctx, AV_LOG_ERROR, "avcC too short\n");
+            return -1;
+        }
+        /* sps and pps in the avcC always have length coded with 2 bytes,
+         * so put a fake nal_length_size = 2 while parsing them */
+        h->nal_length_size = 2;
+        // Decode sps from avcC
+        cnt = *(p + 5) & 0x1f; // Number of sps
+        p  += 6;
+        for (i = 0; i < cnt; i++) {
+            nalsize = AV_RB16(p) + 2;
+            if(nalsize > size - (p-buf))
+                return -1;
+            if (decode_nal_units(h, p, nalsize, 1) < 0) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Decoding sps %d from avcC failed\n", i);
+                return -1;
+            }
+            p += nalsize;
+        }
+        // Decode pps from avcC
+        cnt = *(p++); // Number of pps
+        for (i = 0; i < cnt; i++) {
+            nalsize = AV_RB16(p) + 2;
+            if(nalsize > size - (p-buf))
+                return -1;
+            if (decode_nal_units(h, p, nalsize, 1) < 0) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Decoding pps %d from avcC failed\n", i);
+                return -1;
+            }
+            p += nalsize;
+        }
+        // Now store right nal length size, that will be used to parse all other nals
+        h->nal_length_size = (buf[4] & 0x03) + 1;
+    } else {
+        h->is_avc = 0;
+        if (decode_nal_units(h, buf, size, 1) < 0)
+            return -1;
+    }
+    return size;
+}
+
+av_cold int ff_h264_decode_init(AVCodecContext *avctx)
+{
+    H264Context *h = avctx->priv_data;
+    int i;
+
+    h->avctx = avctx;
+
+    h->bit_depth_luma    = 8;
+    h->chroma_format_idc = 1;
+
+    h->avctx->bits_per_raw_sample = 8;
+    h->cur_chroma_format_idc = 1;
+
+    ff_h264dsp_init(&h->h264dsp, 8, 1);
+    av_assert0(h->sps.bit_depth_chroma == 0);
+    ff_h264chroma_init(&h->h264chroma, h->sps.bit_depth_chroma);
+    ff_h264qpel_init(&h->h264qpel, 8);
+    ff_h264_pred_init(&h->hpc, h->avctx->codec_id, 8, 1);
+
+    h->dequant_coeff_pps = -1;
+
+    /* needed so that IDCT permutation is known early */
+    if (CONFIG_ERROR_RESILIENCE)
+        ff_dsputil_init(&h->dsp, h->avctx);
+    ff_videodsp_init(&h->vdsp, 8);
+
+    memset(h->pps.scaling_matrix4, 16, 6 * 16 * sizeof(uint8_t));
+    memset(h->pps.scaling_matrix8, 16, 2 * 64 * sizeof(uint8_t));
+
+    h->picture_structure   = PICT_FRAME;
+    h->slice_context_count = 1;
+    h->workaround_bugs     = avctx->workaround_bugs;
+    h->flags               = avctx->flags;
+
+    /* set defaults */
+    // s->decode_mb = ff_h263_decode_mb;
+    if (!avctx->has_b_frames)
+        h->low_delay = 1;
+
+    avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
+
+    ff_h264_decode_init_vlc();
+
+    h->pixel_shift = 0;
+    h->sps.bit_depth_luma = avctx->bits_per_raw_sample = 8;
+
+    h->thread_context[0] = h;
+    h->outputed_poc      = h->next_outputed_poc = INT_MIN;
+    for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
+        h->last_pocs[i] = INT_MIN;
+    h->prev_poc_msb = 1 << 16;
+    h->prev_frame_num = -1;
+    h->x264_build   = -1;
+    ff_h264_reset_sei(h);
+    if (avctx->codec_id == AV_CODEC_ID_H264) {
+        if (avctx->ticks_per_frame == 1) {
+            if(h->avctx->time_base.den < INT_MAX/2) {
+                h->avctx->time_base.den *= 2;
+            } else
+                h->avctx->time_base.num /= 2;
+        }
+        avctx->ticks_per_frame = 2;
+    }
+
+    if (avctx->extradata_size > 0 && avctx->extradata &&
+        ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size) < 0) {
+        ff_h264_free_context(h);
+        return -1;
+    }
+
+    if (h->sps.bitstream_restriction_flag &&
+        h->avctx->has_b_frames < h->sps.num_reorder_frames) {
+        h->avctx->has_b_frames = h->sps.num_reorder_frames;
+        h->low_delay           = 0;
+    }
+
+    ff_init_cabac_states();
+    avctx->internal->allocate_progress = 1;
+
+    return 0;
+}
+
+#define IN_RANGE(a, b, size) (((a) >= (b)) && ((a) < ((b) + (size))))
+#undef REBASE_PICTURE
+#define REBASE_PICTURE(pic, new_ctx, old_ctx)             \
+    ((pic && pic >= old_ctx->DPB &&                       \
+      pic < old_ctx->DPB + MAX_PICTURE_COUNT) ?      \
+        &new_ctx->DPB[pic - old_ctx->DPB] : NULL)
+
+static void copy_picture_range(Picture **to, Picture **from, int count,
+                               H264Context *new_base,
+                               H264Context *old_base)
+{
+    int i;
+
+    for (i = 0; i < count; i++) {
+        assert((IN_RANGE(from[i], old_base, sizeof(*old_base)) ||
+                IN_RANGE(from[i], old_base->DPB,
+                         sizeof(Picture) * MAX_PICTURE_COUNT) ||
+                !from[i]));
+        to[i] = REBASE_PICTURE(from[i], new_base, old_base);
+    }
+}
+
+static void copy_parameter_set(void **to, void **from, int count, int size)
+{
+    int i;
+
+    for (i = 0; i < count; i++) {
+        if (to[i] && !from[i])
+            av_freep(&to[i]);
+        else if (from[i] && !to[i])
+            to[i] = av_malloc(size);
+
+        if (from[i])
+            memcpy(to[i], from[i], size);
+    }
+}
+
+static int decode_init_thread_copy(AVCodecContext *avctx)
+{
+    H264Context *h = avctx->priv_data;
+
+    if (!avctx->internal->is_copy)
+        return 0;
+    memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
+    memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
+
+    h->context_initialized = 0;
+
+    return 0;
+}
+
+#define copy_fields(to, from, start_field, end_field)                   \
+    memcpy(&to->start_field, &from->start_field,                        \
+           (char *)&to->end_field - (char *)&to->start_field)
+
+static int h264_slice_header_init(H264Context *, int);
+
+static int h264_set_parameter_from_sps(H264Context *h);
+
+static int decode_update_thread_context(AVCodecContext *dst,
+                                        const AVCodecContext *src)
+{
+    H264Context *h = dst->priv_data, *h1 = src->priv_data;
+    int inited = h->context_initialized, err = 0;
+    int context_reinitialized = 0;
+    int i, ret;
+
+    if (dst == src)
+        return 0;
+
+    if (inited &&
+        (h->width      != h1->width      ||
+         h->height     != h1->height     ||
+         h->mb_width   != h1->mb_width   ||
+         h->mb_height  != h1->mb_height  ||
+         h->sps.bit_depth_luma    != h1->sps.bit_depth_luma    ||
+         h->sps.chroma_format_idc != h1->sps.chroma_format_idc ||
+         h->sps.colorspace        != h1->sps.colorspace)) {
+
+        /* set bits_per_raw_sample to the previous value. the check for changed
+         * bit depth in h264_set_parameter_from_sps() uses it and sets it to
+         * the current value */
+        h->avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
+
+        av_freep(&h->bipred_scratchpad);
+
+        h->width     = h1->width;
+        h->height    = h1->height;
+        h->mb_height = h1->mb_height;
+        h->mb_width  = h1->mb_width;
+        h->mb_num    = h1->mb_num;
+        h->mb_stride = h1->mb_stride;
+        h->b_stride  = h1->b_stride;
+        // SPS/PPS
+        copy_parameter_set((void **)h->sps_buffers, (void **)h1->sps_buffers,
+                        MAX_SPS_COUNT, sizeof(SPS));
+        h->sps = h1->sps;
+        copy_parameter_set((void **)h->pps_buffers, (void **)h1->pps_buffers,
+                        MAX_PPS_COUNT, sizeof(PPS));
+        h->pps = h1->pps;
+
+        if ((err = h264_slice_header_init(h, 1)) < 0) {
+            av_log(h->avctx, AV_LOG_ERROR, "h264_slice_header_init() failed");
+            return err;
+        }
+        context_reinitialized = 1;
+
+#if 0
+        h264_set_parameter_from_sps(h);
+        //Note we set context_reinitialized which will cause h264_set_parameter_from_sps to be reexecuted
+        h->cur_chroma_format_idc = h1->cur_chroma_format_idc;
+#endif
+    }
+    /* update linesize on resize for h264. The h264 decoder doesn't
+     * necessarily call ff_MPV_frame_start in the new thread */
+    h->linesize   = h1->linesize;
+    h->uvlinesize = h1->uvlinesize;
+
+    /* copy block_offset since frame_start may not be called */
+    memcpy(h->block_offset, h1->block_offset, sizeof(h->block_offset));
+
+    if (!inited) {
+        for (i = 0; i < MAX_SPS_COUNT; i++)
+            av_freep(h->sps_buffers + i);
+
+        for (i = 0; i < MAX_PPS_COUNT; i++)
+            av_freep(h->pps_buffers + i);
+
+        memcpy(h, h1, offsetof(H264Context, intra_pcm_ptr));
+        memcpy(&h->cabac, &h1->cabac,
+               sizeof(H264Context) - offsetof(H264Context, cabac));
+        av_assert0((void*)&h->cabac == &h->mb_padding + 1);
+
+        memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
+        memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
+
+        memset(&h->er, 0, sizeof(h->er));
+        memset(&h->me, 0, sizeof(h->me));
+        memset(&h->mb, 0, sizeof(h->mb));
+        memset(&h->mb_luma_dc, 0, sizeof(h->mb_luma_dc));
+        memset(&h->mb_padding, 0, sizeof(h->mb_padding));
+
+        h->avctx = dst;
+        h->DPB   = NULL;
+        h->qscale_table_pool = NULL;
+        h->mb_type_pool = NULL;
+        h->ref_index_pool = NULL;
+        h->motion_val_pool = NULL;
+
+        if (h1->context_initialized) {
+        h->context_initialized = 0;
+
+        memset(&h->cur_pic, 0, sizeof(h->cur_pic));
+        avcodec_get_frame_defaults(&h->cur_pic.f);
+        h->cur_pic.tf.f = &h->cur_pic.f;
+
+        if (ff_h264_alloc_tables(h) < 0) {
+            av_log(dst, AV_LOG_ERROR, "Could not allocate memory for h264\n");
+            return AVERROR(ENOMEM);
+        }
+        context_init(h);
+        }
+
+        for (i = 0; i < 2; i++) {
+            h->rbsp_buffer[i]      = NULL;
+            h->rbsp_buffer_size[i] = 0;
+        }
+        h->bipred_scratchpad = NULL;
+        h->edge_emu_buffer   = NULL;
+
+        h->thread_context[0] = h;
+        h->context_initialized = h1->context_initialized;
+    }
+
+    h->avctx->coded_height  = h1->avctx->coded_height;
+    h->avctx->coded_width   = h1->avctx->coded_width;
+    h->avctx->width         = h1->avctx->width;
+    h->avctx->height        = h1->avctx->height;
+    h->coded_picture_number = h1->coded_picture_number;
+    h->first_field          = h1->first_field;
+    h->picture_structure    = h1->picture_structure;
+    h->qscale               = h1->qscale;
+    h->droppable            = h1->droppable;
+    h->data_partitioning    = h1->data_partitioning;
+    h->low_delay            = h1->low_delay;
+
+    for (i = 0; h->DPB && i < MAX_PICTURE_COUNT; i++) {
+        unref_picture(h, &h->DPB[i]);
+        if (h1->DPB[i].f.data[0] &&
+            (ret = ref_picture(h, &h->DPB[i], &h1->DPB[i])) < 0)
+            return ret;
+    }
+
+    h->cur_pic_ptr     = REBASE_PICTURE(h1->cur_pic_ptr, h, h1);
+    unref_picture(h, &h->cur_pic);
+    if (h1->cur_pic.f.buf[0] && (ret = ref_picture(h, &h->cur_pic, &h1->cur_pic)) < 0)
+        return ret;
+
+    h->workaround_bugs = h1->workaround_bugs;
+    h->low_delay       = h1->low_delay;
+    h->droppable       = h1->droppable;
+
+    // extradata/NAL handling
+    h->is_avc = h1->is_avc;
+
+    // SPS/PPS
+    copy_parameter_set((void **)h->sps_buffers, (void **)h1->sps_buffers,
+                       MAX_SPS_COUNT, sizeof(SPS));
+    h->sps = h1->sps;
+    copy_parameter_set((void **)h->pps_buffers, (void **)h1->pps_buffers,
+                       MAX_PPS_COUNT, sizeof(PPS));
+    h->pps = h1->pps;
+
+    // Dequantization matrices
+    // FIXME these are big - can they be only copied when PPS changes?
+    copy_fields(h, h1, dequant4_buffer, dequant4_coeff);
+
+    for (i = 0; i < 6; i++)
+        h->dequant4_coeff[i] = h->dequant4_buffer[0] +
+                               (h1->dequant4_coeff[i] - h1->dequant4_buffer[0]);
+
+    for (i = 0; i < 6; i++)
+        h->dequant8_coeff[i] = h->dequant8_buffer[0] +
+                               (h1->dequant8_coeff[i] - h1->dequant8_buffer[0]);
+
+    h->dequant_coeff_pps = h1->dequant_coeff_pps;
+
+    // POC timing
+    copy_fields(h, h1, poc_lsb, redundant_pic_count);
+
+    // reference lists
+    copy_fields(h, h1, short_ref, cabac_init_idc);
+
+    copy_picture_range(h->short_ref, h1->short_ref, 32, h, h1);
+    copy_picture_range(h->long_ref, h1->long_ref, 32, h, h1);
+    copy_picture_range(h->delayed_pic, h1->delayed_pic,
+                       MAX_DELAYED_PIC_COUNT + 2, h, h1);
+
+    h->sync            = h1->sync;
+
+    if (context_reinitialized)
+        h264_set_parameter_from_sps(h);
+
+    if (!h->cur_pic_ptr)
+        return 0;
+
+    if (!h->droppable) {
+        err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
+        h->prev_poc_msb = h->poc_msb;
+        h->prev_poc_lsb = h->poc_lsb;
+    }
+    h->prev_frame_num_offset = h->frame_num_offset;
+    h->prev_frame_num        = h->frame_num;
+    h->outputed_poc          = h->next_outputed_poc;
+
+    return err;
+}
+
+static int h264_frame_start(H264Context *h)
+{
+    Picture *pic;
+    int i, ret;
+    const int pixel_shift = h->pixel_shift;
+    int c[4] = {
+        1<<(h->sps.bit_depth_luma-1),
+        1<<(h->sps.bit_depth_chroma-1),
+        1<<(h->sps.bit_depth_chroma-1),
+        -1
+    };
+
+    if (!ff_thread_can_start_frame(h->avctx)) {
+        av_log(h->avctx, AV_LOG_ERROR, "Attempt to start a frame outside SETUP state\n");
+        return -1;
+    }
+
+    release_unused_pictures(h, 1);
+    h->cur_pic_ptr = NULL;
+
+    i = find_unused_picture(h);
+    if (i < 0) {
+        av_log(h->avctx, AV_LOG_ERROR, "no frame buffer available\n");
+        return i;
+    }
+    pic = &h->DPB[i];
+
+    pic->reference            = h->droppable ? 0 : h->picture_structure;
+    pic->f.coded_picture_number = h->coded_picture_number++;
+    pic->field_picture          = h->picture_structure != PICT_FRAME;
+
+    /*
+     * Zero key_frame here; IDR markings per slice in frame or fields are ORed
+     * in later.
+     * See decode_nal_units().
+     */
+    pic->f.key_frame = 0;
+    pic->sync        = 0;
+    pic->mmco_reset  = 0;
+
+    if ((ret = alloc_picture(h, pic)) < 0)
+        return ret;
+    if(!h->sync && !h->avctx->hwaccel &&
+       !(h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU))
+        avpriv_color_frame(&pic->f, c);
+
+    h->cur_pic_ptr = pic;
+    unref_picture(h, &h->cur_pic);
+    if ((ret = ref_picture(h, &h->cur_pic, h->cur_pic_ptr)) < 0)
+        return ret;
+
+    if (CONFIG_ERROR_RESILIENCE) {
+        ff_er_frame_start(&h->er);
+        h->er.last_pic =
+        h->er.next_pic = NULL;
+    }
+
+    assert(h->linesize && h->uvlinesize);
+
+    for (i = 0; i < 16; i++) {
+        h->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 4 * h->linesize * ((scan8[i] - scan8[0]) >> 3);
+        h->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 8 * h->linesize * ((scan8[i] - scan8[0]) >> 3);
+    }
+    for (i = 0; i < 16; i++) {
+        h->block_offset[16 + i]      =
+        h->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 4 * h->uvlinesize * ((scan8[i] - scan8[0]) >> 3);
+        h->block_offset[48 + 16 + i] =
+        h->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 8 * h->uvlinesize * ((scan8[i] - scan8[0]) >> 3);
+    }
+
+    // s->decode = (h->flags & CODEC_FLAG_PSNR) || !s->encoding ||
+    //             h->cur_pic.reference /* || h->contains_intra */ || 1;
+
+    /* We mark the current picture as non-reference after allocating it, so
+     * that if we break out due to an error it can be released automatically
+     * in the next ff_MPV_frame_start().
+     */
+    h->cur_pic_ptr->reference = 0;
+
+    h->cur_pic_ptr->field_poc[0] = h->cur_pic_ptr->field_poc[1] = INT_MAX;
+
+    h->next_output_pic = NULL;
+
+    assert(h->cur_pic_ptr->long_ref == 0);
+
+    return 0;
+}
+
+/**
+ * Run setup operations that must be run after slice header decoding.
+ * This includes finding the next displayed frame.
+ *
+ * @param h h264 master context
+ * @param setup_finished enough NALs have been read that we can call
+ * ff_thread_finish_setup()
+ */
+static void decode_postinit(H264Context *h, int setup_finished)
+{
+    Picture *out = h->cur_pic_ptr;
+    Picture *cur = h->cur_pic_ptr;
+    int i, pics, out_of_order, out_idx;
+
+    h->cur_pic_ptr->f.pict_type   = h->pict_type;
+
+    if (h->next_output_pic)
+        return;
+
+    if (cur->field_poc[0] == INT_MAX || cur->field_poc[1] == INT_MAX) {
+        /* FIXME: if we have two PAFF fields in one packet, we can't start
+         * the next thread here. If we have one field per packet, we can.
+         * The check in decode_nal_units() is not good enough to find this
+         * yet, so we assume the worst for now. */
+        // if (setup_finished)
+        //    ff_thread_finish_setup(h->avctx);
+        return;
+    }
+
+    cur->f.interlaced_frame = 0;
+    cur->f.repeat_pict      = 0;
+
+    /* Signal interlacing information externally. */
+    /* Prioritize picture timing SEI information over used
+     * decoding process if it exists. */
+
+    if (h->sps.pic_struct_present_flag) {
+        switch (h->sei_pic_struct) {
+        case SEI_PIC_STRUCT_FRAME:
+            break;
+        case SEI_PIC_STRUCT_TOP_FIELD:
+        case SEI_PIC_STRUCT_BOTTOM_FIELD:
+            cur->f.interlaced_frame = 1;
+            break;
+        case SEI_PIC_STRUCT_TOP_BOTTOM:
+        case SEI_PIC_STRUCT_BOTTOM_TOP:
+            if (FIELD_OR_MBAFF_PICTURE(h))
+                cur->f.interlaced_frame = 1;
+            else
+                // try to flag soft telecine progressive
+                cur->f.interlaced_frame = h->prev_interlaced_frame;
+            break;
+        case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
+        case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
+            /* Signal the possibility of telecined film externally
+             * (pic_struct 5,6). From these hints, let the applications
+             * decide if they apply deinterlacing. */
+            cur->f.repeat_pict = 1;
+            break;
+        case SEI_PIC_STRUCT_FRAME_DOUBLING:
+            cur->f.repeat_pict = 2;
+            break;
+        case SEI_PIC_STRUCT_FRAME_TRIPLING:
+            cur->f.repeat_pict = 4;
+            break;
+        }
+
+        if ((h->sei_ct_type & 3) &&
+            h->sei_pic_struct <= SEI_PIC_STRUCT_BOTTOM_TOP)
+            cur->f.interlaced_frame = (h->sei_ct_type & (1 << 1)) != 0;
+    } else {
+        /* Derive interlacing flag from used decoding process. */
+        cur->f.interlaced_frame = FIELD_OR_MBAFF_PICTURE(h);
+    }
+    h->prev_interlaced_frame = cur->f.interlaced_frame;
+
+    if (cur->field_poc[0] != cur->field_poc[1]) {
+        /* Derive top_field_first from field pocs. */
+        cur->f.top_field_first = cur->field_poc[0] < cur->field_poc[1];
+    } else {
+        if (cur->f.interlaced_frame || h->sps.pic_struct_present_flag) {
+            /* Use picture timing SEI information. Even if it is a
+             * information of a past frame, better than nothing. */
+            if (h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM ||
+                h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM_TOP)
+                cur->f.top_field_first = 1;
+            else
+                cur->f.top_field_first = 0;
+        } else {
+            /* Most likely progressive */
+            cur->f.top_field_first = 0;
+        }
+    }
+
+    cur->mmco_reset = h->mmco_reset;
+    h->mmco_reset = 0;
+    // FIXME do something with unavailable reference frames
+
+    /* Sort B-frames into display order */
+
+    if (h->sps.bitstream_restriction_flag &&
+        h->avctx->has_b_frames < h->sps.num_reorder_frames) {
+        h->avctx->has_b_frames = h->sps.num_reorder_frames;
+        h->low_delay           = 0;
+    }
+
+    if (h->avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT &&
+        !h->sps.bitstream_restriction_flag) {
+        h->avctx->has_b_frames = MAX_DELAYED_PIC_COUNT - 1;
+        h->low_delay           = 0;
+    }
+
+    for (i = 0; 1; i++) {
+        if(i == MAX_DELAYED_PIC_COUNT || cur->poc < h->last_pocs[i]){
+            if(i)
+                h->last_pocs[i-1] = cur->poc;
+            break;
+        } else if(i) {
+            h->last_pocs[i-1]= h->last_pocs[i];
+        }
+    }
+    out_of_order = MAX_DELAYED_PIC_COUNT - i;
+    if(   cur->f.pict_type == AV_PICTURE_TYPE_B
+       || (h->last_pocs[MAX_DELAYED_PIC_COUNT-2] > INT_MIN && h->last_pocs[MAX_DELAYED_PIC_COUNT-1] - h->last_pocs[MAX_DELAYED_PIC_COUNT-2] > 2))
+        out_of_order = FFMAX(out_of_order, 1);
+    if (out_of_order == MAX_DELAYED_PIC_COUNT) {
+        av_log(h->avctx, AV_LOG_VERBOSE, "Invalid POC %d<%d\n", cur->poc, h->last_pocs[0]);
+        for (i = 1; i < MAX_DELAYED_PIC_COUNT; i++)
+            h->last_pocs[i] = INT_MIN;
+        h->last_pocs[0] = cur->poc;
+        cur->mmco_reset = 1;
+    } else if(h->avctx->has_b_frames < out_of_order && !h->sps.bitstream_restriction_flag){
+        av_log(h->avctx, AV_LOG_VERBOSE, "Increasing reorder buffer to %d\n", out_of_order);
+        h->avctx->has_b_frames = out_of_order;
+        h->low_delay = 0;
+    }
+
+    pics = 0;
+    while (h->delayed_pic[pics])
+        pics++;
+
+    av_assert0(pics <= MAX_DELAYED_PIC_COUNT);
+
+    h->delayed_pic[pics++] = cur;
+    if (cur->reference == 0)
+        cur->reference = DELAYED_PIC_REF;
+
+    out = h->delayed_pic[0];
+    out_idx = 0;
+    for (i = 1; h->delayed_pic[i] &&
+                !h->delayed_pic[i]->f.key_frame &&
+                !h->delayed_pic[i]->mmco_reset;
+         i++)
+        if (h->delayed_pic[i]->poc < out->poc) {
+            out     = h->delayed_pic[i];
+            out_idx = i;
+        }
+    if (h->avctx->has_b_frames == 0 &&
+        (h->delayed_pic[0]->f.key_frame || h->delayed_pic[0]->mmco_reset))
+        h->next_outputed_poc = INT_MIN;
+    out_of_order = out->poc < h->next_outputed_poc;
+
+    if (out_of_order || pics > h->avctx->has_b_frames) {
+        out->reference &= ~DELAYED_PIC_REF;
+        // for frame threading, the owner must be the second field's thread or
+        // else the first thread can release the picture and reuse it unsafely
+        for (i = out_idx; h->delayed_pic[i]; i++)
+            h->delayed_pic[i] = h->delayed_pic[i + 1];
+    }
+    if (!out_of_order && pics > h->avctx->has_b_frames) {
+        h->next_output_pic = out;
+        if (out_idx == 0 && h->delayed_pic[0] && (h->delayed_pic[0]->f.key_frame || h->delayed_pic[0]->mmco_reset)) {
+            h->next_outputed_poc = INT_MIN;
+        } else
+            h->next_outputed_poc = out->poc;
+    } else {
+        av_log(h->avctx, AV_LOG_DEBUG, "no picture %s\n", out_of_order ? "ooo" : "");
+    }
+
+    if (h->next_output_pic && h->next_output_pic->sync) {
+        h->sync |= 2;
+    }
+
+    if (setup_finished && !h->avctx->hwaccel)
+        ff_thread_finish_setup(h->avctx);
+}
+
+static av_always_inline void backup_mb_border(H264Context *h, uint8_t *src_y,
+                                              uint8_t *src_cb, uint8_t *src_cr,
+                                              int linesize, int uvlinesize,
+                                              int simple)
+{
+    uint8_t *top_border;
+    int top_idx = 1;
+    const int pixel_shift = h->pixel_shift;
+    int chroma444 = CHROMA444(h);
+    int chroma422 = CHROMA422(h);
+
+    src_y  -= linesize;
+    src_cb -= uvlinesize;
+    src_cr -= uvlinesize;
+
+    if (!simple && FRAME_MBAFF(h)) {
+        if (h->mb_y & 1) {
+            if (!MB_MBAFF(h)) {
+                top_border = h->top_borders[0][h->mb_x];
+                AV_COPY128(top_border, src_y + 15 * linesize);
+                if (pixel_shift)
+                    AV_COPY128(top_border + 16, src_y + 15 * linesize + 16);
+                if (simple || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) {
+                    if (chroma444) {
+                        if (pixel_shift) {
+                            AV_COPY128(top_border + 32, src_cb + 15 * uvlinesize);
+                            AV_COPY128(top_border + 48, src_cb + 15 * uvlinesize + 16);
+                            AV_COPY128(top_border + 64, src_cr + 15 * uvlinesize);
+                            AV_COPY128(top_border + 80, src_cr + 15 * uvlinesize + 16);
+                        } else {
+                            AV_COPY128(top_border + 16, src_cb + 15 * uvlinesize);
+                            AV_COPY128(top_border + 32, src_cr + 15 * uvlinesize);
+                        }
+                    } else if (chroma422) {
+                        if (pixel_shift) {
+                            AV_COPY128(top_border + 32, src_cb + 15 * uvlinesize);
+                            AV_COPY128(top_border + 48, src_cr + 15 * uvlinesize);
+                        } else {
+                            AV_COPY64(top_border + 16, src_cb + 15 * uvlinesize);
+                            AV_COPY64(top_border + 24, src_cr + 15 * uvlinesize);
+                        }
+                    } else {
+                        if (pixel_shift) {
+                            AV_COPY128(top_border + 32, src_cb + 7 * uvlinesize);
+                            AV_COPY128(top_border + 48, src_cr + 7 * uvlinesize);
+                        } else {
+                            AV_COPY64(top_border + 16, src_cb + 7 * uvlinesize);
+                            AV_COPY64(top_border + 24, src_cr + 7 * uvlinesize);
+                        }
+                    }
+                }
+            }
+        } else if (MB_MBAFF(h)) {
+            top_idx = 0;
+        } else
+            return;
+    }
+
+    top_border = h->top_borders[top_idx][h->mb_x];
+    /* There are two lines saved, the line above the top macroblock
+     * of a pair, and the line above the bottom macroblock. */
+    AV_COPY128(top_border, src_y + 16 * linesize);
+    if (pixel_shift)
+        AV_COPY128(top_border + 16, src_y + 16 * linesize + 16);
+
+    if (simple || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) {
+        if (chroma444) {
+            if (pixel_shift) {
+                AV_COPY128(top_border + 32, src_cb + 16 * linesize);
+                AV_COPY128(top_border + 48, src_cb + 16 * linesize + 16);
+                AV_COPY128(top_border + 64, src_cr + 16 * linesize);
+                AV_COPY128(top_border + 80, src_cr + 16 * linesize + 16);
+            } else {
+                AV_COPY128(top_border + 16, src_cb + 16 * linesize);
+                AV_COPY128(top_border + 32, src_cr + 16 * linesize);
+            }
+        } else if (chroma422) {
+            if (pixel_shift) {
+                AV_COPY128(top_border + 32, src_cb + 16 * uvlinesize);
+                AV_COPY128(top_border + 48, src_cr + 16 * uvlinesize);
+            } else {
+                AV_COPY64(top_border + 16, src_cb + 16 * uvlinesize);
+                AV_COPY64(top_border + 24, src_cr + 16 * uvlinesize);
+            }
+        } else {
+            if (pixel_shift) {
+                AV_COPY128(top_border + 32, src_cb + 8 * uvlinesize);
+                AV_COPY128(top_border + 48, src_cr + 8 * uvlinesize);
+            } else {
+                AV_COPY64(top_border + 16, src_cb + 8 * uvlinesize);
+                AV_COPY64(top_border + 24, src_cr + 8 * uvlinesize);
+            }
+        }
+    }
+}
+
+static av_always_inline void xchg_mb_border(H264Context *h, uint8_t *src_y,
+                                            uint8_t *src_cb, uint8_t *src_cr,
+                                            int linesize, int uvlinesize,
+                                            int xchg, int chroma444,
+                                            int simple, int pixel_shift)
+{
+    int deblock_topleft;
+    int deblock_top;
+    int top_idx = 1;
+    uint8_t *top_border_m1;
+    uint8_t *top_border;
+
+    if (!simple && FRAME_MBAFF(h)) {
+        if (h->mb_y & 1) {
+            if (!MB_MBAFF(h))
+                return;
+        } else {
+            top_idx = MB_MBAFF(h) ? 0 : 1;
+        }
+    }
+
+    if (h->deblocking_filter == 2) {
+        deblock_topleft = h->slice_table[h->mb_xy - 1 - h->mb_stride] == h->slice_num;
+        deblock_top     = h->top_type;
+    } else {
+        deblock_topleft = (h->mb_x > 0);
+        deblock_top     = (h->mb_y > !!MB_FIELD(h));
+    }
+
+    src_y  -= linesize   + 1 + pixel_shift;
+    src_cb -= uvlinesize + 1 + pixel_shift;
+    src_cr -= uvlinesize + 1 + pixel_shift;
+
+    top_border_m1 = h->top_borders[top_idx][h->mb_x - 1];
+    top_border    = h->top_borders[top_idx][h->mb_x];
+
+#define XCHG(a, b, xchg)                        \
+    if (pixel_shift) {                          \
+        if (xchg) {                             \
+            AV_SWAP64(b + 0, a + 0);            \
+            AV_SWAP64(b + 8, a + 8);            \
+        } else {                                \
+            AV_COPY128(b, a);                   \
+        }                                       \
+    } else if (xchg)                            \
+        AV_SWAP64(b, a);                        \
+    else                                        \
+        AV_COPY64(b, a);
+
+    if (deblock_top) {
+        if (deblock_topleft) {
+            XCHG(top_border_m1 + (8 << pixel_shift),
+                 src_y - (7 << pixel_shift), 1);
+        }
+        XCHG(top_border + (0 << pixel_shift), src_y + (1 << pixel_shift), xchg);
+        XCHG(top_border + (8 << pixel_shift), src_y + (9 << pixel_shift), 1);
+        if (h->mb_x + 1 < h->mb_width) {
+            XCHG(h->top_borders[top_idx][h->mb_x + 1],
+                 src_y + (17 << pixel_shift), 1);
+        }
+    }
+    if (simple || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) {
+        if (chroma444) {
+            if (deblock_topleft) {
+                XCHG(top_border_m1 + (24 << pixel_shift), src_cb - (7 << pixel_shift), 1);
+                XCHG(top_border_m1 + (40 << pixel_shift), src_cr - (7 << pixel_shift), 1);
+            }
+            XCHG(top_border + (16 << pixel_shift), src_cb + (1 << pixel_shift), xchg);
+            XCHG(top_border + (24 << pixel_shift), src_cb + (9 << pixel_shift), 1);
+            XCHG(top_border + (32 << pixel_shift), src_cr + (1 << pixel_shift), xchg);
+            XCHG(top_border + (40 << pixel_shift), src_cr + (9 << pixel_shift), 1);
+            if (h->mb_x + 1 < h->mb_width) {
+                XCHG(h->top_borders[top_idx][h->mb_x + 1] + (16 << pixel_shift), src_cb + (17 << pixel_shift), 1);
+                XCHG(h->top_borders[top_idx][h->mb_x + 1] + (32 << pixel_shift), src_cr + (17 << pixel_shift), 1);
+            }
+        } else {
+            if (deblock_top) {
+                if (deblock_topleft) {
+                    XCHG(top_border_m1 + (16 << pixel_shift), src_cb - (7 << pixel_shift), 1);
+                    XCHG(top_border_m1 + (24 << pixel_shift), src_cr - (7 << pixel_shift), 1);
+                }
+                XCHG(top_border + (16 << pixel_shift), src_cb + 1 + pixel_shift, 1);
+                XCHG(top_border + (24 << pixel_shift), src_cr + 1 + pixel_shift, 1);
+            }
+        }
+    }
+}
+
+static av_always_inline int dctcoef_get(int16_t *mb, int high_bit_depth,
+                                        int index)
+{
+    if (high_bit_depth) {
+        return AV_RN32A(((int32_t *)mb) + index);
+    } else
+        return AV_RN16A(mb + index);
+}
+
+static av_always_inline void dctcoef_set(int16_t *mb, int high_bit_depth,
+                                         int index, int value)
+{
+    if (high_bit_depth) {
+        AV_WN32A(((int32_t *)mb) + index, value);
+    } else
+        AV_WN16A(mb + index, value);
+}
+
+static av_always_inline void hl_decode_mb_predict_luma(H264Context *h,
+                                                       int mb_type, int is_h264,
+                                                       int simple,
+                                                       int transform_bypass,
+                                                       int pixel_shift,
+                                                       int *block_offset,
+                                                       int linesize,
+                                                       uint8_t *dest_y, int p)
+{
+    void (*idct_add)(uint8_t *dst, int16_t *block, int stride);
+    void (*idct_dc_add)(uint8_t *dst, int16_t *block, int stride);
+    int i;
+    int qscale = p == 0 ? h->qscale : h->chroma_qp[p - 1];
+    block_offset += 16 * p;
+    if (IS_INTRA4x4(mb_type)) {
+        if (IS_8x8DCT(mb_type)) {
+            if (transform_bypass) {
+                idct_dc_add  =
+                idct_add     = h->h264dsp.h264_add_pixels8_clear;
+            } else {
+                idct_dc_add = h->h264dsp.h264_idct8_dc_add;
+                idct_add    = h->h264dsp.h264_idct8_add;
+            }
+            for (i = 0; i < 16; i += 4) {
+                uint8_t *const ptr = dest_y + block_offset[i];
+                const int dir      = h->intra4x4_pred_mode_cache[scan8[i]];
+                if (transform_bypass && h->sps.profile_idc == 244 && dir <= 1) {
+                    h->hpc.pred8x8l_add[dir](ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                } else {
+                    const int nnz = h->non_zero_count_cache[scan8[i + p * 16]];
+                    h->hpc.pred8x8l[dir](ptr, (h->topleft_samples_available << i) & 0x8000,
+                                         (h->topright_samples_available << i) & 0x4000, linesize);
+                    if (nnz) {
+                        if (nnz == 1 && dctcoef_get(h->mb, pixel_shift, i * 16 + p * 256))
+                            idct_dc_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                        else
+                            idct_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                    }
+                }
+            }
+        } else {
+            if (transform_bypass) {
+                idct_dc_add  =
+                idct_add     = h->h264dsp.h264_add_pixels4_clear;
+            } else {
+                idct_dc_add = h->h264dsp.h264_idct_dc_add;
+                idct_add    = h->h264dsp.h264_idct_add;
+            }
+            for (i = 0; i < 16; i++) {
+                uint8_t *const ptr = dest_y + block_offset[i];
+                const int dir      = h->intra4x4_pred_mode_cache[scan8[i]];
+
+                if (transform_bypass && h->sps.profile_idc == 244 && dir <= 1) {
+                    h->hpc.pred4x4_add[dir](ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                } else {
+                    uint8_t *topright;
+                    int nnz, tr;
+                    uint64_t tr_high;
+                    if (dir == DIAG_DOWN_LEFT_PRED || dir == VERT_LEFT_PRED) {
+                        const int topright_avail = (h->topright_samples_available << i) & 0x8000;
+                        av_assert2(h->mb_y || linesize <= block_offset[i]);
+                        if (!topright_avail) {
+                            if (pixel_shift) {
+                                tr_high  = ((uint16_t *)ptr)[3 - linesize / 2] * 0x0001000100010001ULL;
+                                topright = (uint8_t *)&tr_high;
+                            } else {
+                                tr       = ptr[3 - linesize] * 0x01010101u;
+                                topright = (uint8_t *)&tr;
+                            }
+                        } else
+                            topright = ptr + (4 << pixel_shift) - linesize;
+                    } else
+                        topright = NULL;
+
+                    h->hpc.pred4x4[dir](ptr, topright, linesize);
+                    nnz = h->non_zero_count_cache[scan8[i + p * 16]];
+                    if (nnz) {
+                        if (is_h264) {
+                            if (nnz == 1 && dctcoef_get(h->mb, pixel_shift, i * 16 + p * 256))
+                                idct_dc_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                            else
+                                idct_add(ptr, h->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                        } else if (CONFIG_SVQ3_DECODER)
+                            ff_svq3_add_idct_c(ptr, h->mb + i * 16 + p * 256, linesize, qscale, 0);
+                    }
+                }
+            }
+        }
+    } else {
+        h->hpc.pred16x16[h->intra16x16_pred_mode](dest_y, linesize);
+        if (is_h264) {
+            if (h->non_zero_count_cache[scan8[LUMA_DC_BLOCK_INDEX + p]]) {
+                if (!transform_bypass)
+                    h->h264dsp.h264_luma_dc_dequant_idct(h->mb + (p * 256 << pixel_shift),
+                                                         h->mb_luma_dc[p],
+                                                         h->dequant4_coeff[p][qscale][0]);
+                else {
+                    static const uint8_t dc_mapping[16] = {
+                         0 * 16,  1 * 16,  4 * 16,  5 * 16,
+                         2 * 16,  3 * 16,  6 * 16,  7 * 16,
+                         8 * 16,  9 * 16, 12 * 16, 13 * 16,
+                        10 * 16, 11 * 16, 14 * 16, 15 * 16 };
+                    for (i = 0; i < 16; i++)
+                        dctcoef_set(h->mb + (p * 256 << pixel_shift),
+                                    pixel_shift, dc_mapping[i],
+                                    dctcoef_get(h->mb_luma_dc[p],
+                                                pixel_shift, i));
+                }
+            }
+        } else if (CONFIG_SVQ3_DECODER)
+            ff_svq3_luma_dc_dequant_idct_c(h->mb + p * 256,
+                                           h->mb_luma_dc[p], qscale);
+    }
+}
+
+static av_always_inline void hl_decode_mb_idct_luma(H264Context *h, int mb_type,
+                                                    int is_h264, int simple,
+                                                    int transform_bypass,
+                                                    int pixel_shift,
+                                                    int *block_offset,
+                                                    int linesize,
+                                                    uint8_t *dest_y, int p)
+{
+    void (*idct_add)(uint8_t *dst, int16_t *block, int stride);
+    int i;
+    block_offset += 16 * p;
+    if (!IS_INTRA4x4(mb_type)) {
+        if (is_h264) {
+            if (IS_INTRA16x16(mb_type)) {
+                if (transform_bypass) {
+                    if (h->sps.profile_idc == 244 &&
+                        (h->intra16x16_pred_mode == VERT_PRED8x8 ||
+                         h->intra16x16_pred_mode == HOR_PRED8x8)) {
+                        h->hpc.pred16x16_add[h->intra16x16_pred_mode](dest_y, block_offset,
+                                                                      h->mb + (p * 256 << pixel_shift),
+                                                                      linesize);
+                    } else {
+                        for (i = 0; i < 16; i++)
+                            if (h->non_zero_count_cache[scan8[i + p * 16]] ||
+                                dctcoef_get(h->mb, pixel_shift, i * 16 + p * 256))
+                                h->h264dsp.h264_add_pixels4_clear(dest_y + block_offset[i],
+                                                                  h->mb + (i * 16 + p * 256 << pixel_shift),
+                                                                  linesize);
+                    }
+                } else {
+                    h->h264dsp.h264_idct_add16intra(dest_y, block_offset,
+                                                    h->mb + (p * 256 << pixel_shift),
+                                                    linesize,
+                                                    h->non_zero_count_cache + p * 5 * 8);
+                }
+            } else if (h->cbp & 15) {
+                if (transform_bypass) {
+                    const int di = IS_8x8DCT(mb_type) ? 4 : 1;
+                    idct_add = IS_8x8DCT(mb_type) ? h->h264dsp.h264_add_pixels8_clear
+                                                  : h->h264dsp.h264_add_pixels4_clear;
+                    for (i = 0; i < 16; i += di)
+                        if (h->non_zero_count_cache[scan8[i + p * 16]])
+                            idct_add(dest_y + block_offset[i],
+                                     h->mb + (i * 16 + p * 256 << pixel_shift),
+                                     linesize);
+                } else {
+                    if (IS_8x8DCT(mb_type))
+                        h->h264dsp.h264_idct8_add4(dest_y, block_offset,
+                                                   h->mb + (p * 256 << pixel_shift),
+                                                   linesize,
+                                                   h->non_zero_count_cache + p * 5 * 8);
+                    else
+                        h->h264dsp.h264_idct_add16(dest_y, block_offset,
+                                                   h->mb + (p * 256 << pixel_shift),
+                                                   linesize,
+                                                   h->non_zero_count_cache + p * 5 * 8);
+                }
+            }
+        } else if (CONFIG_SVQ3_DECODER) {
+            for (i = 0; i < 16; i++)
+                if (h->non_zero_count_cache[scan8[i + p * 16]] || h->mb[i * 16 + p * 256]) {
+                    // FIXME benchmark weird rule, & below
+                    uint8_t *const ptr = dest_y + block_offset[i];
+                    ff_svq3_add_idct_c(ptr, h->mb + i * 16 + p * 256, linesize,
+                                       h->qscale, IS_INTRA(mb_type) ? 1 : 0);
+                }
+        }
+    }
+}
+
+#define BITS   8
+#define SIMPLE 1
+#include "h264_mb_template.c"
+
+#undef  BITS
+#define BITS   16
+#include "h264_mb_template.c"
+
+#undef  SIMPLE
+#define SIMPLE 0
+#include "h264_mb_template.c"
+
+void ff_h264_hl_decode_mb(H264Context *h)
+{
+    const int mb_xy   = h->mb_xy;
+    const int mb_type = h->cur_pic.mb_type[mb_xy];
+    int is_complex    = CONFIG_SMALL || h->is_complex || IS_INTRA_PCM(mb_type) || h->qscale == 0;
+
+    if (CHROMA444(h)) {
+        if (is_complex || h->pixel_shift)
+            hl_decode_mb_444_complex(h);
+        else
+            hl_decode_mb_444_simple_8(h);
+    } else if (is_complex) {
+        hl_decode_mb_complex(h);
+    } else if (h->pixel_shift) {
+        hl_decode_mb_simple_16(h);
+    } else
+        hl_decode_mb_simple_8(h);
+}
+
+static int pred_weight_table(H264Context *h)
+{
+    int list, i;
+    int luma_def, chroma_def;
+
+    h->use_weight             = 0;
+    h->use_weight_chroma      = 0;
+    h->luma_log2_weight_denom = get_ue_golomb(&h->gb);
+    if (h->sps.chroma_format_idc)
+        h->chroma_log2_weight_denom = get_ue_golomb(&h->gb);
+    luma_def   = 1 << h->luma_log2_weight_denom;
+    chroma_def = 1 << h->chroma_log2_weight_denom;
+
+    for (list = 0; list < 2; list++) {
+        h->luma_weight_flag[list]   = 0;
+        h->chroma_weight_flag[list] = 0;
+        for (i = 0; i < h->ref_count[list]; i++) {
+            int luma_weight_flag, chroma_weight_flag;
+
+            luma_weight_flag = get_bits1(&h->gb);
+            if (luma_weight_flag) {
+                h->luma_weight[i][list][0] = get_se_golomb(&h->gb);
+                h->luma_weight[i][list][1] = get_se_golomb(&h->gb);
+                if (h->luma_weight[i][list][0] != luma_def ||
+                    h->luma_weight[i][list][1] != 0) {
+                    h->use_weight             = 1;
+                    h->luma_weight_flag[list] = 1;
+                }
+            } else {
+                h->luma_weight[i][list][0] = luma_def;
+                h->luma_weight[i][list][1] = 0;
+            }
+
+            if (h->sps.chroma_format_idc) {
+                chroma_weight_flag = get_bits1(&h->gb);
+                if (chroma_weight_flag) {
+                    int j;
+                    for (j = 0; j < 2; j++) {
+                        h->chroma_weight[i][list][j][0] = get_se_golomb(&h->gb);
+                        h->chroma_weight[i][list][j][1] = get_se_golomb(&h->gb);
+                        if (h->chroma_weight[i][list][j][0] != chroma_def ||
+                            h->chroma_weight[i][list][j][1] != 0) {
+                            h->use_weight_chroma = 1;
+                            h->chroma_weight_flag[list] = 1;
+                        }
+                    }
+                } else {
+                    int j;
+                    for (j = 0; j < 2; j++) {
+                        h->chroma_weight[i][list][j][0] = chroma_def;
+                        h->chroma_weight[i][list][j][1] = 0;
+                    }
+                }
+            }
+        }
+        if (h->slice_type_nos != AV_PICTURE_TYPE_B)
+            break;
+    }
+    h->use_weight = h->use_weight || h->use_weight_chroma;
+    return 0;
+}
+
+/**
+ * Initialize implicit_weight table.
+ * @param field  0/1 initialize the weight for interlaced MBAFF
+ *                -1 initializes the rest
+ */
+static void implicit_weight_table(H264Context *h, int field)
+{
+    int ref0, ref1, i, cur_poc, ref_start, ref_count0, ref_count1;
+
+    for (i = 0; i < 2; i++) {
+        h->luma_weight_flag[i]   = 0;
+        h->chroma_weight_flag[i] = 0;
+    }
+
+    if (field < 0) {
+        if (h->picture_structure == PICT_FRAME) {
+            cur_poc = h->cur_pic_ptr->poc;
+        } else {
+            cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure - 1];
+        }
+        if (h->ref_count[0] == 1 && h->ref_count[1] == 1 && !FRAME_MBAFF(h) &&
+            h->ref_list[0][0].poc + h->ref_list[1][0].poc == 2 * cur_poc) {
+            h->use_weight = 0;
+            h->use_weight_chroma = 0;
+            return;
+        }
+        ref_start  = 0;
+        ref_count0 = h->ref_count[0];
+        ref_count1 = h->ref_count[1];
+    } else {
+        cur_poc    = h->cur_pic_ptr->field_poc[field];
+        ref_start  = 16;
+        ref_count0 = 16 + 2 * h->ref_count[0];
+        ref_count1 = 16 + 2 * h->ref_count[1];
+    }
+
+    h->use_weight               = 2;
+    h->use_weight_chroma        = 2;
+    h->luma_log2_weight_denom   = 5;
+    h->chroma_log2_weight_denom = 5;
+
+    for (ref0 = ref_start; ref0 < ref_count0; ref0++) {
+        int poc0 = h->ref_list[0][ref0].poc;
+        for (ref1 = ref_start; ref1 < ref_count1; ref1++) {
+            int w = 32;
+            if (!h->ref_list[0][ref0].long_ref && !h->ref_list[1][ref1].long_ref) {
+                int poc1 = h->ref_list[1][ref1].poc;
+                int td   = av_clip(poc1 - poc0, -128, 127);
+                if (td) {
+                    int tb = av_clip(cur_poc - poc0, -128, 127);
+                    int tx = (16384 + (FFABS(td) >> 1)) / td;
+                    int dist_scale_factor = (tb * tx + 32) >> 8;
+                    if (dist_scale_factor >= -64 && dist_scale_factor <= 128)
+                        w = 64 - dist_scale_factor;
+                }
+            }
+            if (field < 0) {
+                h->implicit_weight[ref0][ref1][0] =
+                h->implicit_weight[ref0][ref1][1] = w;
+            } else {
+                h->implicit_weight[ref0][ref1][field] = w;
+            }
+        }
+    }
+}
+
+/**
+ * instantaneous decoder refresh.
+ */
+static void idr(H264Context *h)
+{
+    int i;
+    ff_h264_remove_all_refs(h);
+    h->prev_frame_num        = 0;
+    h->prev_frame_num_offset = 0;
+    h->prev_poc_msb          = 1<<16;
+    h->prev_poc_lsb          = 0;
+    for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
+        h->last_pocs[i] = INT_MIN;
+}
+
+/* forget old pics after a seek */
+static void flush_change(H264Context *h)
+{
+    int i, j;
+
+    h->outputed_poc = h->next_outputed_poc = INT_MIN;
+    h->prev_interlaced_frame = 1;
+    idr(h);
+
+    h->prev_frame_num = -1;
+    if (h->cur_pic_ptr) {
+        h->cur_pic_ptr->reference = 0;
+        for (j=i=0; h->delayed_pic[i]; i++)
+            if (h->delayed_pic[i] != h->cur_pic_ptr)
+                h->delayed_pic[j++] = h->delayed_pic[i];
+        h->delayed_pic[j] = NULL;
+    }
+    h->first_field = 0;
+    memset(h->ref_list[0], 0, sizeof(h->ref_list[0]));
+    memset(h->ref_list[1], 0, sizeof(h->ref_list[1]));
+    memset(h->default_ref_list[0], 0, sizeof(h->default_ref_list[0]));
+    memset(h->default_ref_list[1], 0, sizeof(h->default_ref_list[1]));
+    ff_h264_reset_sei(h);
+    h->recovery_frame= -1;
+    h->sync= 0;
+    h->list_count = 0;
+    h->current_slice = 0;
+}
+
+/* forget old pics after a seek */
+static void flush_dpb(AVCodecContext *avctx)
+{
+    H264Context *h = avctx->priv_data;
+    int i;
+
+    for (i = 0; i <= MAX_DELAYED_PIC_COUNT; i++) {
+        if (h->delayed_pic[i])
+            h->delayed_pic[i]->reference = 0;
+        h->delayed_pic[i] = NULL;
+    }
+
+    flush_change(h);
+
+    if (h->DPB)
+        for (i = 0; i < MAX_PICTURE_COUNT; i++)
+            unref_picture(h, &h->DPB[i]);
+    h->cur_pic_ptr = NULL;
+    unref_picture(h, &h->cur_pic);
+
+    h->mb_x = h->mb_y = 0;
+
+    h->parse_context.state             = -1;
+    h->parse_context.frame_start_found = 0;
+    h->parse_context.overread          = 0;
+    h->parse_context.overread_index    = 0;
+    h->parse_context.index             = 0;
+    h->parse_context.last_index        = 0;
+}
+
+static int init_poc(H264Context *h)
+{
+    const int max_frame_num = 1 << h->sps.log2_max_frame_num;
+    int field_poc[2];
+    Picture *cur = h->cur_pic_ptr;
+
+    h->frame_num_offset = h->prev_frame_num_offset;
+    if (h->frame_num < h->prev_frame_num)
+        h->frame_num_offset += max_frame_num;
+
+    if (h->sps.poc_type == 0) {
+        const int max_poc_lsb = 1 << h->sps.log2_max_poc_lsb;
+
+        if (h->poc_lsb < h->prev_poc_lsb && h->prev_poc_lsb - h->poc_lsb >= max_poc_lsb / 2)
+            h->poc_msb = h->prev_poc_msb + max_poc_lsb;
+        else if (h->poc_lsb > h->prev_poc_lsb && h->prev_poc_lsb - h->poc_lsb < -max_poc_lsb / 2)
+            h->poc_msb = h->prev_poc_msb - max_poc_lsb;
+        else
+            h->poc_msb = h->prev_poc_msb;
+        field_poc[0] =
+        field_poc[1] = h->poc_msb + h->poc_lsb;
+        if (h->picture_structure == PICT_FRAME)
+            field_poc[1] += h->delta_poc_bottom;
+    } else if (h->sps.poc_type == 1) {
+        int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
+        int i;
+
+        if (h->sps.poc_cycle_length != 0)
+            abs_frame_num = h->frame_num_offset + h->frame_num;
+        else
+            abs_frame_num = 0;
+
+        if (h->nal_ref_idc == 0 && abs_frame_num > 0)
+            abs_frame_num--;
+
+        expected_delta_per_poc_cycle = 0;
+        for (i = 0; i < h->sps.poc_cycle_length; i++)
+            // FIXME integrate during sps parse
+            expected_delta_per_poc_cycle += h->sps.offset_for_ref_frame[i];
+
+        if (abs_frame_num > 0) {
+            int poc_cycle_cnt          = (abs_frame_num - 1) / h->sps.poc_cycle_length;
+            int frame_num_in_poc_cycle = (abs_frame_num - 1) % h->sps.poc_cycle_length;
+
+            expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
+            for (i = 0; i <= frame_num_in_poc_cycle; i++)
+                expectedpoc = expectedpoc + h->sps.offset_for_ref_frame[i];
+        } else
+            expectedpoc = 0;
+
+        if (h->nal_ref_idc == 0)
+            expectedpoc = expectedpoc + h->sps.offset_for_non_ref_pic;
+
+        field_poc[0] = expectedpoc + h->delta_poc[0];
+        field_poc[1] = field_poc[0] + h->sps.offset_for_top_to_bottom_field;
+
+        if (h->picture_structure == PICT_FRAME)
+            field_poc[1] += h->delta_poc[1];
+    } else {
+        int poc = 2 * (h->frame_num_offset + h->frame_num);
+
+        if (!h->nal_ref_idc)
+            poc--;
+
+        field_poc[0] = poc;
+        field_poc[1] = poc;
+    }
+
+    if (h->picture_structure != PICT_BOTTOM_FIELD)
+        h->cur_pic_ptr->field_poc[0] = field_poc[0];
+    if (h->picture_structure != PICT_TOP_FIELD)
+        h->cur_pic_ptr->field_poc[1] = field_poc[1];
+    cur->poc = FFMIN(cur->field_poc[0], cur->field_poc[1]);
+
+    return 0;
+}
+
+/**
+ * initialize scan tables
+ */
+static void init_scan_tables(H264Context *h)
+{
+    int i;
+    for (i = 0; i < 16; i++) {
+#define T(x) (x >> 2) | ((x << 2) & 0xF)
+        h->zigzag_scan[i] = T(zigzag_scan[i]);
+        h->field_scan[i]  = T(field_scan[i]);
+#undef T
+    }
+    for (i = 0; i < 64; i++) {
+#define T(x) (x >> 3) | ((x & 7) << 3)
+        h->zigzag_scan8x8[i]       = T(ff_zigzag_direct[i]);
+        h->zigzag_scan8x8_cavlc[i] = T(zigzag_scan8x8_cavlc[i]);
+        h->field_scan8x8[i]        = T(field_scan8x8[i]);
+        h->field_scan8x8_cavlc[i]  = T(field_scan8x8_cavlc[i]);
+#undef T
+    }
+    if (h->sps.transform_bypass) { // FIXME same ugly
+        memcpy(h->zigzag_scan_q0          , zigzag_scan             , sizeof(h->zigzag_scan_q0         ));
+        memcpy(h->zigzag_scan8x8_q0       , ff_zigzag_direct        , sizeof(h->zigzag_scan8x8_q0      ));
+        memcpy(h->zigzag_scan8x8_cavlc_q0 , zigzag_scan8x8_cavlc    , sizeof(h->zigzag_scan8x8_cavlc_q0));
+        memcpy(h->field_scan_q0           , field_scan              , sizeof(h->field_scan_q0          ));
+        memcpy(h->field_scan8x8_q0        , field_scan8x8           , sizeof(h->field_scan8x8_q0       ));
+        memcpy(h->field_scan8x8_cavlc_q0  , field_scan8x8_cavlc     , sizeof(h->field_scan8x8_cavlc_q0 ));
+    } else {
+        memcpy(h->zigzag_scan_q0          , h->zigzag_scan          , sizeof(h->zigzag_scan_q0         ));
+        memcpy(h->zigzag_scan8x8_q0       , h->zigzag_scan8x8       , sizeof(h->zigzag_scan8x8_q0      ));
+        memcpy(h->zigzag_scan8x8_cavlc_q0 , h->zigzag_scan8x8_cavlc , sizeof(h->zigzag_scan8x8_cavlc_q0));
+        memcpy(h->field_scan_q0           , h->field_scan           , sizeof(h->field_scan_q0          ));
+        memcpy(h->field_scan8x8_q0        , h->field_scan8x8        , sizeof(h->field_scan8x8_q0       ));
+        memcpy(h->field_scan8x8_cavlc_q0  , h->field_scan8x8_cavlc  , sizeof(h->field_scan8x8_cavlc_q0 ));
+    }
+}
+
+static int field_end(H264Context *h, int in_setup)
+{
+    AVCodecContext *const avctx = h->avctx;
+    int err = 0;
+    h->mb_y = 0;
+
+    if (CONFIG_H264_VDPAU_DECODER &&
+        h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
+        ff_vdpau_h264_set_reference_frames(h);
+
+    if (in_setup || !(avctx->active_thread_type & FF_THREAD_FRAME)) {
+        if (!h->droppable) {
+            err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
+            h->prev_poc_msb = h->poc_msb;
+            h->prev_poc_lsb = h->poc_lsb;
+        }
+        h->prev_frame_num_offset = h->frame_num_offset;
+        h->prev_frame_num        = h->frame_num;
+        h->outputed_poc          = h->next_outputed_poc;
+    }
+
+    if (avctx->hwaccel) {
+        if (avctx->hwaccel->end_frame(avctx) < 0)
+            av_log(avctx, AV_LOG_ERROR,
+                   "hardware accelerator failed to decode picture\n");
+    }
+
+    if (CONFIG_H264_VDPAU_DECODER &&
+        h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
+        ff_vdpau_h264_picture_complete(h);
+
+    /*
+     * FIXME: Error handling code does not seem to support interlaced
+     * when slices span multiple rows
+     * The ff_er_add_slice calls don't work right for bottom
+     * fields; they cause massive erroneous error concealing
+     * Error marking covers both fields (top and bottom).
+     * This causes a mismatched s->error_count
+     * and a bad error table. Further, the error count goes to
+     * INT_MAX when called for bottom field, because mb_y is
+     * past end by one (callers fault) and resync_mb_y != 0
+     * causes problems for the first MB line, too.
+     */
+    if (CONFIG_ERROR_RESILIENCE &&
+        !FIELD_PICTURE(h) && h->current_slice && !h->sps.new) {
+        h->er.cur_pic  = h->cur_pic_ptr;
+        ff_er_frame_end(&h->er);
+    }
+    if (!in_setup && !h->droppable)
+        ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
+                                  h->picture_structure == PICT_BOTTOM_FIELD);
+    emms_c();
+
+    h->current_slice = 0;
+
+    return err;
+}
+
+/**
+ * Replicate H264 "master" context to thread contexts.
+ */
+static int clone_slice(H264Context *dst, H264Context *src)
+{
+    memcpy(dst->block_offset, src->block_offset, sizeof(dst->block_offset));
+    dst->cur_pic_ptr = src->cur_pic_ptr;
+    dst->cur_pic     = src->cur_pic;
+    dst->linesize    = src->linesize;
+    dst->uvlinesize  = src->uvlinesize;
+    dst->first_field = src->first_field;
+
+    dst->prev_poc_msb          = src->prev_poc_msb;
+    dst->prev_poc_lsb          = src->prev_poc_lsb;
+    dst->prev_frame_num_offset = src->prev_frame_num_offset;
+    dst->prev_frame_num        = src->prev_frame_num;
+    dst->short_ref_count       = src->short_ref_count;
+
+    memcpy(dst->short_ref,        src->short_ref,        sizeof(dst->short_ref));
+    memcpy(dst->long_ref,         src->long_ref,         sizeof(dst->long_ref));
+    memcpy(dst->default_ref_list, src->default_ref_list, sizeof(dst->default_ref_list));
+
+    memcpy(dst->dequant4_coeff,   src->dequant4_coeff,   sizeof(src->dequant4_coeff));
+    memcpy(dst->dequant8_coeff,   src->dequant8_coeff,   sizeof(src->dequant8_coeff));
+
+    return 0;
+}
+
+/**
+ * Compute profile from profile_idc and constraint_set?_flags.
+ *
+ * @param sps SPS
+ *
+ * @return profile as defined by FF_PROFILE_H264_*
+ */
+int ff_h264_get_profile(SPS *sps)
+{
+    int profile = sps->profile_idc;
+
+    switch (sps->profile_idc) {
+    case FF_PROFILE_H264_BASELINE:
+        // constraint_set1_flag set to 1
+        profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
+        break;
+    case FF_PROFILE_H264_HIGH_10:
+    case FF_PROFILE_H264_HIGH_422:
+    case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
+        // constraint_set3_flag set to 1
+        profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
+        break;
+    }
+
+    return profile;
+}
+
+static int h264_set_parameter_from_sps(H264Context *h)
+{
+    if (h->flags & CODEC_FLAG_LOW_DELAY ||
+        (h->sps.bitstream_restriction_flag &&
+         !h->sps.num_reorder_frames)) {
+        if (h->avctx->has_b_frames > 1 || h->delayed_pic[0])
+            av_log(h->avctx, AV_LOG_WARNING, "Delayed frames seen. "
+                   "Reenabling low delay requires a codec flush.\n");
+        else
+            h->low_delay = 1;
+    }
+
+    if (h->avctx->has_b_frames < 2)
+        h->avctx->has_b_frames = !h->low_delay;
+
+    if (h->sps.bit_depth_luma != h->sps.bit_depth_chroma) {
+        avpriv_request_sample(h->avctx,
+                              "Different chroma and luma bit depth");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (h->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
+        h->cur_chroma_format_idc      != h->sps.chroma_format_idc) {
+        if (h->avctx->codec &&
+            h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU &&
+            (h->sps.bit_depth_luma != 8 || h->sps.chroma_format_idc > 1)) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "VDPAU decoding does not support video colorspace.\n");
+            return AVERROR_INVALIDDATA;
+        }
+        if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 14 &&
+            h->sps.bit_depth_luma != 11 && h->sps.bit_depth_luma != 13) {
+            h->avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
+            h->cur_chroma_format_idc      = h->sps.chroma_format_idc;
+            h->pixel_shift                = h->sps.bit_depth_luma > 8;
+
+            ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma,
+                            h->sps.chroma_format_idc);
+            ff_h264chroma_init(&h->h264chroma, h->sps.bit_depth_chroma);
+            ff_h264qpel_init(&h->h264qpel, h->sps.bit_depth_luma);
+            ff_h264_pred_init(&h->hpc, h->avctx->codec_id, h->sps.bit_depth_luma,
+                              h->sps.chroma_format_idc);
+
+            if (CONFIG_ERROR_RESILIENCE)
+                ff_dsputil_init(&h->dsp, h->avctx);
+            ff_videodsp_init(&h->vdsp, h->sps.bit_depth_luma);
+        } else {
+            av_log(h->avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n",
+                   h->sps.bit_depth_luma);
+            return AVERROR_INVALIDDATA;
+        }
+    }
+    return 0;
+}
+
+static enum AVPixelFormat get_pixel_format(H264Context *h, int force_callback)
+{
+    switch (h->sps.bit_depth_luma) {
+    case 9:
+        if (CHROMA444(h)) {
+            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
+                return AV_PIX_FMT_GBRP9;
+            } else
+                return AV_PIX_FMT_YUV444P9;
+        } else if (CHROMA422(h))
+            return AV_PIX_FMT_YUV422P9;
+        else
+            return AV_PIX_FMT_YUV420P9;
+        break;
+    case 10:
+        if (CHROMA444(h)) {
+            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
+                return AV_PIX_FMT_GBRP10;
+            } else
+                return AV_PIX_FMT_YUV444P10;
+        } else if (CHROMA422(h))
+            return AV_PIX_FMT_YUV422P10;
+        else
+            return AV_PIX_FMT_YUV420P10;
+        break;
+    case 12:
+        if (CHROMA444(h)) {
+            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
+                return AV_PIX_FMT_GBRP12;
+            } else
+                return AV_PIX_FMT_YUV444P12;
+        } else if (CHROMA422(h))
+            return AV_PIX_FMT_YUV422P12;
+        else
+            return AV_PIX_FMT_YUV420P12;
+        break;
+    case 14:
+        if (CHROMA444(h)) {
+            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
+                return AV_PIX_FMT_GBRP14;
+            } else
+                return AV_PIX_FMT_YUV444P14;
+        } else if (CHROMA422(h))
+            return AV_PIX_FMT_YUV422P14;
+        else
+            return AV_PIX_FMT_YUV420P14;
+        break;
+    case 8:
+        if (CHROMA444(h)) {
+            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
+                av_log(h->avctx, AV_LOG_DEBUG, "Detected GBR colorspace.\n");
+                return AV_PIX_FMT_GBR24P;
+            } else if (h->avctx->colorspace == AVCOL_SPC_YCGCO) {
+                av_log(h->avctx, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
+            }
+            return h->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ444P
+                                                                : AV_PIX_FMT_YUV444P;
+        } else if (CHROMA422(h)) {
+            return h->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ422P
+                                                             : AV_PIX_FMT_YUV422P;
+        } else {
+            int i;
+            const enum AVPixelFormat * fmt = h->avctx->codec->pix_fmts ?
+                                        h->avctx->codec->pix_fmts :
+                                        h->avctx->color_range == AVCOL_RANGE_JPEG ?
+                                        h264_hwaccel_pixfmt_list_jpeg_420 :
+                                        h264_hwaccel_pixfmt_list_420;
+
+            for (i=0; fmt[i] != AV_PIX_FMT_NONE; i++)
+                if (fmt[i] == h->avctx->pix_fmt && !force_callback)
+                    return fmt[i];
+            return ff_thread_get_format(h->avctx, fmt);
+        }
+        break;
+    default:
+        av_log(h->avctx, AV_LOG_ERROR,
+               "Unsupported bit depth: %d\n", h->sps.bit_depth_luma);
+        return AVERROR_INVALIDDATA;
+    }
+}
+
+/* export coded and cropped frame dimensions to AVCodecContext */
+static int init_dimensions(H264Context *h)
+{
+    int width  = h->width  - (h->sps.crop_right + h->sps.crop_left);
+    int height = h->height - (h->sps.crop_top   + h->sps.crop_bottom);
+
+    /* handle container cropping */
+    if (!h->sps.crop &&
+        FFALIGN(h->avctx->width,  16) == h->width &&
+        FFALIGN(h->avctx->height, 16) == h->height) {
+        width  = h->avctx->width;
+        height = h->avctx->height;
+    }
+
+    if (width <= 0 || height <= 0) {
+        av_log(h->avctx, AV_LOG_ERROR, "Invalid cropped dimensions: %dx%d.\n",
+               width, height);
+        if (h->avctx->err_recognition & AV_EF_EXPLODE)
+            return AVERROR_INVALIDDATA;
+
+        av_log(h->avctx, AV_LOG_WARNING, "Ignoring cropping information.\n");
+        h->sps.crop_bottom = h->sps.crop_top = h->sps.crop_right = h->sps.crop_left = 0;
+        h->sps.crop = 0;
+
+        width  = h->width;
+        height = h->height;
+    }
+
+    h->avctx->coded_width  = h->width;
+    h->avctx->coded_height = h->height;
+    h->avctx->width        = width;
+    h->avctx->height       = height;
+
+    return 0;
+}
+
+static int h264_slice_header_init(H264Context *h, int reinit)
+{
+    int nb_slices = (HAVE_THREADS &&
+                     h->avctx->active_thread_type & FF_THREAD_SLICE) ?
+                    h->avctx->thread_count : 1;
+    int i;
+
+    h->avctx->sample_aspect_ratio = h->sps.sar;
+    av_assert0(h->avctx->sample_aspect_ratio.den);
+    av_pix_fmt_get_chroma_sub_sample(h->avctx->pix_fmt,
+                                     &h->chroma_x_shift, &h->chroma_y_shift);
+
+    if (h->sps.timing_info_present_flag) {
+        int64_t den = h->sps.time_scale;
+        if (h->x264_build < 44U)
+            den *= 2;
+        av_reduce(&h->avctx->time_base.num, &h->avctx->time_base.den,
+                  h->sps.num_units_in_tick, den, 1 << 30);
+    }
+
+    h->avctx->hwaccel = ff_find_hwaccel(h->avctx->codec->id, h->avctx->pix_fmt);
+
+    if (reinit)
+        free_tables(h, 0);
+    h->first_field = 0;
+    h->prev_interlaced_frame = 1;
+
+    init_scan_tables(h);
+    if (ff_h264_alloc_tables(h) < 0) {
+        av_log(h->avctx, AV_LOG_ERROR,
+               "Could not allocate memory for h264\n");
+        return AVERROR(ENOMEM);
+    }
+
+    if (nb_slices > MAX_THREADS || (nb_slices > h->mb_height && h->mb_height)) {
+        int max_slices;
+        if (h->mb_height)
+            max_slices = FFMIN(MAX_THREADS, h->mb_height);
+        else
+            max_slices = MAX_THREADS;
+        av_log(h->avctx, AV_LOG_WARNING, "too many threads/slices (%d),"
+               " reducing to %d\n", nb_slices, max_slices);
+        nb_slices = max_slices;
+    }
+    h->slice_context_count = nb_slices;
+
+    if (!HAVE_THREADS || !(h->avctx->active_thread_type & FF_THREAD_SLICE)) {
+        if (context_init(h) < 0) {
+            av_log(h->avctx, AV_LOG_ERROR, "context_init() failed.\n");
+            return -1;
+        }
+    } else {
+        for (i = 1; i < h->slice_context_count; i++) {
+            H264Context *c;
+            c = h->thread_context[i] = av_mallocz(sizeof(H264Context));
+            c->avctx       = h->avctx;
+            if (CONFIG_ERROR_RESILIENCE) {
+                c->dsp         = h->dsp;
+            }
+            c->vdsp        = h->vdsp;
+            c->h264dsp     = h->h264dsp;
+            c->h264qpel    = h->h264qpel;
+            c->h264chroma  = h->h264chroma;
+            c->sps         = h->sps;
+            c->pps         = h->pps;
+            c->pixel_shift = h->pixel_shift;
+            c->cur_chroma_format_idc = h->cur_chroma_format_idc;
+            c->width       = h->width;
+            c->height      = h->height;
+            c->linesize    = h->linesize;
+            c->uvlinesize  = h->uvlinesize;
+            c->chroma_x_shift = h->chroma_x_shift;
+            c->chroma_y_shift = h->chroma_y_shift;
+            c->qscale      = h->qscale;
+            c->droppable   = h->droppable;
+            c->data_partitioning = h->data_partitioning;
+            c->low_delay   = h->low_delay;
+            c->mb_width    = h->mb_width;
+            c->mb_height   = h->mb_height;
+            c->mb_stride   = h->mb_stride;
+            c->mb_num      = h->mb_num;
+            c->flags       = h->flags;
+            c->workaround_bugs = h->workaround_bugs;
+            c->pict_type   = h->pict_type;
+
+            init_scan_tables(c);
+            clone_tables(c, h, i);
+            c->context_initialized = 1;
+        }
+
+        for (i = 0; i < h->slice_context_count; i++)
+            if (context_init(h->thread_context[i]) < 0) {
+                av_log(h->avctx, AV_LOG_ERROR, "context_init() failed.\n");
+                return -1;
+            }
+    }
+
+    h->context_initialized = 1;
+
+    return 0;
+}
+
+/**
+ * Decode a slice header.
+ * This will also call ff_MPV_common_init() and frame_start() as needed.
+ *
+ * @param h h264context
+ * @param h0 h264 master context (differs from 'h' when doing sliced based
+ *           parallel decoding)
+ *
+ * @return 0 if okay, <0 if an error occurred, 1 if decoding must not be multithreaded
+ */
+static int decode_slice_header(H264Context *h, H264Context *h0)
+{
+    unsigned int first_mb_in_slice;
+    unsigned int pps_id;
+    int num_ref_idx_active_override_flag, ret;
+    unsigned int slice_type, tmp, i, j;
+    int last_pic_structure, last_pic_droppable;
+    int must_reinit;
+    int needs_reinit = 0;
+
+    h->me.qpel_put = h->h264qpel.put_h264_qpel_pixels_tab;
+    h->me.qpel_avg = h->h264qpel.avg_h264_qpel_pixels_tab;
+
+    first_mb_in_slice = get_ue_golomb_long(&h->gb);
+
+    if (first_mb_in_slice == 0) { // FIXME better field boundary detection
+        if (h0->current_slice && FIELD_PICTURE(h)) {
+            field_end(h, 1);
+        }
+
+        h0->current_slice = 0;
+        if (!h0->first_field) {
+            if (h->cur_pic_ptr && !h->droppable) {
+                ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
+                                          h->picture_structure == PICT_BOTTOM_FIELD);
+            }
+            h->cur_pic_ptr = NULL;
+        }
+    }
+
+    slice_type = get_ue_golomb_31(&h->gb);
+    if (slice_type > 9) {
+        av_log(h->avctx, AV_LOG_ERROR,
+               "slice type too large (%d) at %d %d\n",
+               slice_type, h->mb_x, h->mb_y);
+        return -1;
+    }
+    if (slice_type > 4) {
+        slice_type -= 5;
+        h->slice_type_fixed = 1;
+    } else
+        h->slice_type_fixed = 0;
+
+    slice_type = golomb_to_pict_type[slice_type];
+    h->slice_type     = slice_type;
+    h->slice_type_nos = slice_type & 3;
+
+    // to make a few old functions happy, it's wrong though
+    h->pict_type = h->slice_type;
+
+    pps_id = get_ue_golomb(&h->gb);
+    if (pps_id >= MAX_PPS_COUNT) {
+        av_log(h->avctx, AV_LOG_ERROR, "pps_id %d out of range\n", pps_id);
+        return -1;
+    }
+    if (!h0->pps_buffers[pps_id]) {
+        av_log(h->avctx, AV_LOG_ERROR,
+               "non-existing PPS %u referenced\n",
+               pps_id);
+        return -1;
+    }
+    h->pps = *h0->pps_buffers[pps_id];
+
+    if (!h0->sps_buffers[h->pps.sps_id]) {
+        av_log(h->avctx, AV_LOG_ERROR,
+               "non-existing SPS %u referenced\n",
+               h->pps.sps_id);
+        return -1;
+    }
+
+    if (h->pps.sps_id != h->current_sps_id ||
+        h0->sps_buffers[h->pps.sps_id]->new) {
+        h0->sps_buffers[h->pps.sps_id]->new = 0;
+
+        h->current_sps_id = h->pps.sps_id;
+        h->sps            = *h0->sps_buffers[h->pps.sps_id];
+
+        if (h->mb_width  != h->sps.mb_width ||
+            h->mb_height != h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag) ||
+            h->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
+            h->cur_chroma_format_idc != h->sps.chroma_format_idc
+        )
+            needs_reinit = 1;
+
+        if (h->bit_depth_luma    != h->sps.bit_depth_luma ||
+            h->chroma_format_idc != h->sps.chroma_format_idc) {
+            h->bit_depth_luma    = h->sps.bit_depth_luma;
+            h->chroma_format_idc = h->sps.chroma_format_idc;
+            needs_reinit         = 1;
+        }
+        if ((ret = h264_set_parameter_from_sps(h)) < 0)
+            return ret;
+    }
+
+    h->avctx->profile = ff_h264_get_profile(&h->sps);
+    h->avctx->level   = h->sps.level_idc;
+    h->avctx->refs    = h->sps.ref_frame_count;
+
+    must_reinit = (h->context_initialized &&
+                    (   16*h->sps.mb_width != h->avctx->coded_width
+                     || 16*h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag) != h->avctx->coded_height
+                     || h->avctx->bits_per_raw_sample != h->sps.bit_depth_luma
+                     || h->cur_chroma_format_idc != h->sps.chroma_format_idc
+                     || av_cmp_q(h->sps.sar, h->avctx->sample_aspect_ratio)));
+    if (h0->avctx->pix_fmt != get_pixel_format(h0, 0))
+        must_reinit = 1;
+
+    h->mb_width  = h->sps.mb_width;
+    h->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);
+    h->mb_num    = h->mb_width * h->mb_height;
+    h->mb_stride = h->mb_width + 1;
+
+    h->b_stride = h->mb_width * 4;
+
+    h->chroma_y_shift = h->sps.chroma_format_idc <= 1; // 400 uses yuv420p
+
+    h->width  = 16 * h->mb_width;
+    h->height = 16 * h->mb_height;
+
+    ret = init_dimensions(h);
+    if (ret < 0)
+        return ret;
+
+    if (h->sps.video_signal_type_present_flag) {
+        h->avctx->color_range = h->sps.full_range>0 ? AVCOL_RANGE_JPEG
+                                                    : AVCOL_RANGE_MPEG;
+        if (h->sps.colour_description_present_flag) {
+            if (h->avctx->colorspace != h->sps.colorspace)
+                needs_reinit = 1;
+            h->avctx->color_primaries = h->sps.color_primaries;
+            h->avctx->color_trc       = h->sps.color_trc;
+            h->avctx->colorspace      = h->sps.colorspace;
+        }
+    }
+
+    if (h->context_initialized &&
+        (h->width  != h->avctx->coded_width   ||
+         h->height != h->avctx->coded_height  ||
+         must_reinit ||
+         needs_reinit)) {
+
+        if (h != h0) {
+            av_log(h->avctx, AV_LOG_ERROR, "changing width/height on "
+                   "slice %d\n", h0->current_slice + 1);
+            return AVERROR_INVALIDDATA;
+        }
+
+        flush_change(h);
+
+        if ((ret = get_pixel_format(h, 1)) < 0)
+            return ret;
+        h->avctx->pix_fmt = ret;
+
+        av_log(h->avctx, AV_LOG_INFO, "Reinit context to %dx%d, "
+               "pix_fmt: %d\n", h->width, h->height, h->avctx->pix_fmt);
+
+        if ((ret = h264_slice_header_init(h, 1)) < 0) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "h264_slice_header_init() failed\n");
+            return ret;
+        }
+    }
+    if (!h->context_initialized) {
+        if (h != h0) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "Cannot (re-)initialize context during parallel decoding.\n");
+            return -1;
+        }
+
+        if ((ret = get_pixel_format(h, 1)) < 0)
+            return ret;
+        h->avctx->pix_fmt = ret;
+
+        if ((ret = h264_slice_header_init(h, 0)) < 0) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "h264_slice_header_init() failed\n");
+            return ret;
+        }
+    }
+
+    if (h == h0 && h->dequant_coeff_pps != pps_id) {
+        h->dequant_coeff_pps = pps_id;
+        init_dequant_tables(h);
+    }
+
+    h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num);
+
+    h->mb_mbaff        = 0;
+    h->mb_aff_frame    = 0;
+    last_pic_structure = h0->picture_structure;
+    last_pic_droppable = h0->droppable;
+    h->droppable       = h->nal_ref_idc == 0;
+    if (h->sps.frame_mbs_only_flag) {
+        h->picture_structure = PICT_FRAME;
+    } else {
+        if (!h->sps.direct_8x8_inference_flag && slice_type == AV_PICTURE_TYPE_B) {
+            av_log(h->avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
+            return -1;
+        }
+        if (get_bits1(&h->gb)) { // field_pic_flag
+            h->picture_structure = PICT_TOP_FIELD + get_bits1(&h->gb); // bottom_field_flag
+        } else {
+            h->picture_structure = PICT_FRAME;
+            h->mb_aff_frame      = h->sps.mb_aff;
+        }
+    }
+    h->mb_field_decoding_flag = h->picture_structure != PICT_FRAME;
+
+    if (h0->current_slice != 0) {
+        if (last_pic_structure != h->picture_structure ||
+            last_pic_droppable != h->droppable) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "Changing field mode (%d -> %d) between slices is not allowed\n",
+                   last_pic_structure, h->picture_structure);
+            h->picture_structure = last_pic_structure;
+            h->droppable         = last_pic_droppable;
+            return AVERROR_INVALIDDATA;
+        } else if (!h0->cur_pic_ptr) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "unset cur_pic_ptr on %d. slice\n",
+                   h0->current_slice + 1);
+            return AVERROR_INVALIDDATA;
+        }
+    } else {
+        /* Shorten frame num gaps so we don't have to allocate reference
+         * frames just to throw them away */
+        if (h->frame_num != h->prev_frame_num && h->prev_frame_num >= 0) {
+            int unwrap_prev_frame_num = h->prev_frame_num;
+            int max_frame_num         = 1 << h->sps.log2_max_frame_num;
+
+            if (unwrap_prev_frame_num > h->frame_num)
+                unwrap_prev_frame_num -= max_frame_num;
+
+            if ((h->frame_num - unwrap_prev_frame_num) > h->sps.ref_frame_count) {
+                unwrap_prev_frame_num = (h->frame_num - h->sps.ref_frame_count) - 1;
+                if (unwrap_prev_frame_num < 0)
+                    unwrap_prev_frame_num += max_frame_num;
+
+                h->prev_frame_num = unwrap_prev_frame_num;
+            }
+        }
+
+        /* See if we have a decoded first field looking for a pair...
+         * Here, we're using that to see if we should mark previously
+         * decode frames as "finished".
+         * We have to do that before the "dummy" in-between frame allocation,
+         * since that can modify h->cur_pic_ptr. */
+        if (h0->first_field) {
+            assert(h0->cur_pic_ptr);
+            assert(h0->cur_pic_ptr->f.data[0]);
+            assert(h0->cur_pic_ptr->reference != DELAYED_PIC_REF);
+
+            /* Mark old field/frame as completed */
+            if (!last_pic_droppable && h0->cur_pic_ptr->tf.owner == h0->avctx) {
+                ff_thread_report_progress(&h0->cur_pic_ptr->tf, INT_MAX,
+                                          last_pic_structure == PICT_BOTTOM_FIELD);
+            }
+
+            /* figure out if we have a complementary field pair */
+            if (!FIELD_PICTURE(h) || h->picture_structure == last_pic_structure) {
+                /* Previous field is unmatched. Don't display it, but let it
+                 * remain for reference if marked as such. */
+                if (!last_pic_droppable && last_pic_structure != PICT_FRAME) {
+                    ff_thread_report_progress(&h0->cur_pic_ptr->tf, INT_MAX,
+                                              last_pic_structure == PICT_TOP_FIELD);
+                }
+            } else {
+                if (h0->cur_pic_ptr->frame_num != h->frame_num) {
+                    /* This and previous field were reference, but had
+                     * different frame_nums. Consider this field first in
+                     * pair. Throw away previous field except for reference
+                     * purposes. */
+                    if (!last_pic_droppable && last_pic_structure != PICT_FRAME) {
+                        ff_thread_report_progress(&h0->cur_pic_ptr->tf, INT_MAX,
+                                                  last_pic_structure == PICT_TOP_FIELD);
+                    }
+                } else {
+                    /* Second field in complementary pair */
+                    if (!((last_pic_structure   == PICT_TOP_FIELD &&
+                           h->picture_structure == PICT_BOTTOM_FIELD) ||
+                          (last_pic_structure   == PICT_BOTTOM_FIELD &&
+                           h->picture_structure == PICT_TOP_FIELD))) {
+                        av_log(h->avctx, AV_LOG_ERROR,
+                               "Invalid field mode combination %d/%d\n",
+                               last_pic_structure, h->picture_structure);
+                        h->picture_structure = last_pic_structure;
+                        h->droppable         = last_pic_droppable;
+                        return AVERROR_INVALIDDATA;
+                    } else if (last_pic_droppable != h->droppable) {
+                        avpriv_request_sample(h->avctx,
+                                              "Found reference and non-reference fields in the same frame, which");
+                        h->picture_structure = last_pic_structure;
+                        h->droppable         = last_pic_droppable;
+                        return AVERROR_PATCHWELCOME;
+                    }
+                }
+            }
+        }
+
+        while (h->frame_num != h->prev_frame_num && h->prev_frame_num >= 0 && !h0->first_field &&
+               h->frame_num != (h->prev_frame_num + 1) % (1 << h->sps.log2_max_frame_num)) {
+            Picture *prev = h->short_ref_count ? h->short_ref[0] : NULL;
+            av_log(h->avctx, AV_LOG_DEBUG, "Frame num gap %d %d\n",
+                   h->frame_num, h->prev_frame_num);
+            if (!h->sps.gaps_in_frame_num_allowed_flag)
+                for(i=0; i<FF_ARRAY_ELEMS(h->last_pocs); i++)
+                    h->last_pocs[i] = INT_MIN;
+            if (h264_frame_start(h) < 0)
+                return -1;
+            h->prev_frame_num++;
+            h->prev_frame_num %= 1 << h->sps.log2_max_frame_num;
+            h->cur_pic_ptr->frame_num = h->prev_frame_num;
+            ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX, 0);
+            ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX, 1);
+            if ((ret = ff_generate_sliding_window_mmcos(h, 1)) < 0 &&
+                h->avctx->err_recognition & AV_EF_EXPLODE)
+                return ret;
+            if (ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index) < 0 &&
+                (h->avctx->err_recognition & AV_EF_EXPLODE))
+                return AVERROR_INVALIDDATA;
+            /* Error concealment: if a ref is missing, copy the previous ref in its place.
+             * FIXME: avoiding a memcpy would be nice, but ref handling makes many assumptions
+             * about there being no actual duplicates.
+             * FIXME: this doesn't copy padding for out-of-frame motion vectors.  Given we're
+             * concealing a lost frame, this probably isn't noticeable by comparison, but it should
+             * be fixed. */
+            if (h->short_ref_count) {
+                if (prev) {
+                    av_image_copy(h->short_ref[0]->f.data, h->short_ref[0]->f.linesize,
+                                  (const uint8_t **)prev->f.data, prev->f.linesize,
+                                  h->avctx->pix_fmt, h->mb_width * 16, h->mb_height * 16);
+                    h->short_ref[0]->poc = prev->poc + 2;
+                }
+                h->short_ref[0]->frame_num = h->prev_frame_num;
+            }
+        }
+
+        /* See if we have a decoded first field looking for a pair...
+         * We're using that to see whether to continue decoding in that
+         * frame, or to allocate a new one. */
+        if (h0->first_field) {
+            assert(h0->cur_pic_ptr);
+            assert(h0->cur_pic_ptr->f.data[0]);
+            assert(h0->cur_pic_ptr->reference != DELAYED_PIC_REF);
+
+            /* figure out if we have a complementary field pair */
+            if (!FIELD_PICTURE(h) || h->picture_structure == last_pic_structure) {
+                /* Previous field is unmatched. Don't display it, but let it
+                 * remain for reference if marked as such. */
+                h0->cur_pic_ptr = NULL;
+                h0->first_field = FIELD_PICTURE(h);
+            } else {
+                if (h0->cur_pic_ptr->frame_num != h->frame_num) {
+                    ff_thread_report_progress(&h0->cur_pic_ptr->tf, INT_MAX,
+                                              h0->picture_structure==PICT_BOTTOM_FIELD);
+                    /* This and the previous field had different frame_nums.
+                     * Consider this field first in pair. Throw away previous
+                     * one except for reference purposes. */
+                    h0->first_field = 1;
+                    h0->cur_pic_ptr = NULL;
+                } else {
+                    /* Second field in complementary pair */
+                    h0->first_field = 0;
+                }
+            }
+        } else {
+            /* Frame or first field in a potentially complementary pair */
+            h0->first_field = FIELD_PICTURE(h);
+        }
+
+        if (!FIELD_PICTURE(h) || h0->first_field) {
+            if (h264_frame_start(h) < 0) {
+                h0->first_field = 0;
+                return -1;
+            }
+        } else {
+            release_unused_pictures(h, 0);
+        }
+        /* Some macroblocks can be accessed before they're available in case
+        * of lost slices, MBAFF or threading. */
+        if (FIELD_PICTURE(h)) {
+            for(i = (h->picture_structure == PICT_BOTTOM_FIELD); i<h->mb_height; i++)
+                memset(h->slice_table + i*h->mb_stride, -1, (h->mb_stride - (i+1==h->mb_height)) * sizeof(*h->slice_table));
+        } else {
+            memset(h->slice_table, -1,
+                (h->mb_height * h->mb_stride - 1) * sizeof(*h->slice_table));
+        }
+        h0->last_slice_type = -1;
+    }
+    if (h != h0 && (ret = clone_slice(h, h0)) < 0)
+        return ret;
+
+    /* can't be in alloc_tables because linesize isn't known there.
+     * FIXME: redo bipred weight to not require extra buffer? */
+    for (i = 0; i < h->slice_context_count; i++)
+        if (h->thread_context[i]) {
+            ret = alloc_scratch_buffers(h->thread_context[i], h->linesize);
+            if (ret < 0)
+                return ret;
+        }
+
+    h->cur_pic_ptr->frame_num = h->frame_num; // FIXME frame_num cleanup
+
+    av_assert1(h->mb_num == h->mb_width * h->mb_height);
+    if (first_mb_in_slice << FIELD_OR_MBAFF_PICTURE(h) >= h->mb_num ||
+        first_mb_in_slice >= h->mb_num) {
+        av_log(h->avctx, AV_LOG_ERROR, "first_mb_in_slice overflow\n");
+        return -1;
+    }
+    h->resync_mb_x = h->mb_x =  first_mb_in_slice % h->mb_width;
+    h->resync_mb_y = h->mb_y = (first_mb_in_slice / h->mb_width) << FIELD_OR_MBAFF_PICTURE(h);
+    if (h->picture_structure == PICT_BOTTOM_FIELD)
+        h->resync_mb_y = h->mb_y = h->mb_y + 1;
+    av_assert1(h->mb_y < h->mb_height);
+
+    if (h->picture_structure == PICT_FRAME) {
+        h->curr_pic_num = h->frame_num;
+        h->max_pic_num  = 1 << h->sps.log2_max_frame_num;
+    } else {
+        h->curr_pic_num = 2 * h->frame_num + 1;
+        h->max_pic_num  = 1 << (h->sps.log2_max_frame_num + 1);
+    }
+
+    if (h->nal_unit_type == NAL_IDR_SLICE)
+        get_ue_golomb(&h->gb); /* idr_pic_id */
+
+    if (h->sps.poc_type == 0) {
+        h->poc_lsb = get_bits(&h->gb, h->sps.log2_max_poc_lsb);
+
+        if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
+            h->delta_poc_bottom = get_se_golomb(&h->gb);
+    }
+
+    if (h->sps.poc_type == 1 && !h->sps.delta_pic_order_always_zero_flag) {
+        h->delta_poc[0] = get_se_golomb(&h->gb);
+
+        if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
+            h->delta_poc[1] = get_se_golomb(&h->gb);
+    }
+
+    init_poc(h);
+
+    if (h->pps.redundant_pic_cnt_present)
+        h->redundant_pic_count = get_ue_golomb(&h->gb);
+
+    // set defaults, might be overridden a few lines later
+    h->ref_count[0] = h->pps.ref_count[0];
+    h->ref_count[1] = h->pps.ref_count[1];
+
+    if (h->slice_type_nos != AV_PICTURE_TYPE_I) {
+        unsigned max[2];
+        max[0] = max[1] = h->picture_structure == PICT_FRAME ? 15 : 31;
+
+        if (h->slice_type_nos == AV_PICTURE_TYPE_B)
+            h->direct_spatial_mv_pred = get_bits1(&h->gb);
+        num_ref_idx_active_override_flag = get_bits1(&h->gb);
+
+        if (num_ref_idx_active_override_flag) {
+            h->ref_count[0] = get_ue_golomb(&h->gb) + 1;
+            if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
+                h->ref_count[1] = get_ue_golomb(&h->gb) + 1;
+            } else
+                // full range is spec-ok in this case, even for frames
+                h->ref_count[1] = 1;
+        }
+
+        if (h->ref_count[0]-1 > max[0] || h->ref_count[1]-1 > max[1]){
+            av_log(h->avctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n", h->ref_count[0]-1, max[0], h->ref_count[1]-1, max[1]);
+            h->ref_count[0] = h->ref_count[1] = 0;
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (h->slice_type_nos == AV_PICTURE_TYPE_B)
+            h->list_count = 2;
+        else
+            h->list_count = 1;
+    } else {
+        h->list_count = 0;
+        h->ref_count[0] = h->ref_count[1] = 0;
+    }
+    if (slice_type != AV_PICTURE_TYPE_I &&
+        (h0->current_slice == 0 ||
+         slice_type != h0->last_slice_type ||
+         memcmp(h0->last_ref_count, h0->ref_count, sizeof(h0->ref_count)))) {
+        ff_h264_fill_default_ref_list(h);
+    }
+
+    if (h->slice_type_nos != AV_PICTURE_TYPE_I &&
+        ff_h264_decode_ref_pic_list_reordering(h) < 0) {
+        h->ref_count[1] = h->ref_count[0] = 0;
+        return -1;
+    }
+
+    if ((h->pps.weighted_pred && h->slice_type_nos == AV_PICTURE_TYPE_P) ||
+        (h->pps.weighted_bipred_idc == 1 &&
+         h->slice_type_nos == AV_PICTURE_TYPE_B))
+        pred_weight_table(h);
+    else if (h->pps.weighted_bipred_idc == 2 &&
+             h->slice_type_nos == AV_PICTURE_TYPE_B) {
+        implicit_weight_table(h, -1);
+    } else {
+        h->use_weight = 0;
+        for (i = 0; i < 2; i++) {
+            h->luma_weight_flag[i]   = 0;
+            h->chroma_weight_flag[i] = 0;
+        }
+    }
+
+    // If frame-mt is enabled, only update mmco tables for the first slice
+    // in a field. Subsequent slices can temporarily clobber h->mmco_index
+    // or h->mmco, which will cause ref list mix-ups and decoding errors
+    // further down the line. This may break decoding if the first slice is
+    // corrupt, thus we only do this if frame-mt is enabled.
+    if (h->nal_ref_idc &&
+        ff_h264_decode_ref_pic_marking(h0, &h->gb,
+                            !(h->avctx->active_thread_type & FF_THREAD_FRAME) ||
+                            h0->current_slice == 0) < 0 &&
+        (h->avctx->err_recognition & AV_EF_EXPLODE))
+        return AVERROR_INVALIDDATA;
+
+    if (FRAME_MBAFF(h)) {
+        ff_h264_fill_mbaff_ref_list(h);
+
+        if (h->pps.weighted_bipred_idc == 2 && h->slice_type_nos == AV_PICTURE_TYPE_B) {
+            implicit_weight_table(h, 0);
+            implicit_weight_table(h, 1);
+        }
+    }
+
+    if (h->slice_type_nos == AV_PICTURE_TYPE_B && !h->direct_spatial_mv_pred)
+        ff_h264_direct_dist_scale_factor(h);
+    ff_h264_direct_ref_list_init(h);
+
+    if (h->slice_type_nos != AV_PICTURE_TYPE_I && h->pps.cabac) {
+        tmp = get_ue_golomb_31(&h->gb);
+        if (tmp > 2) {
+            av_log(h->avctx, AV_LOG_ERROR, "cabac_init_idc overflow\n");
+            return -1;
+        }
+        h->cabac_init_idc = tmp;
+    }
+
+    h->last_qscale_diff = 0;
+    tmp = h->pps.init_qp + get_se_golomb(&h->gb);
+    if (tmp > 51 + 6 * (h->sps.bit_depth_luma - 8)) {
+        av_log(h->avctx, AV_LOG_ERROR, "QP %u out of range\n", tmp);
+        return -1;
+    }
+    h->qscale       = tmp;
+    h->chroma_qp[0] = get_chroma_qp(h, 0, h->qscale);
+    h->chroma_qp[1] = get_chroma_qp(h, 1, h->qscale);
+    // FIXME qscale / qp ... stuff
+    if (h->slice_type == AV_PICTURE_TYPE_SP)
+        get_bits1(&h->gb); /* sp_for_switch_flag */
+    if (h->slice_type == AV_PICTURE_TYPE_SP ||
+        h->slice_type == AV_PICTURE_TYPE_SI)
+        get_se_golomb(&h->gb); /* slice_qs_delta */
+
+    h->deblocking_filter     = 1;
+    h->slice_alpha_c0_offset = 52;
+    h->slice_beta_offset     = 52;
+    if (h->pps.deblocking_filter_parameters_present) {
+        tmp = get_ue_golomb_31(&h->gb);
+        if (tmp > 2) {
+            av_log(h->avctx, AV_LOG_ERROR,
+                   "deblocking_filter_idc %u out of range\n", tmp);
+            return -1;
+        }
+        h->deblocking_filter = tmp;
+        if (h->deblocking_filter < 2)
+            h->deblocking_filter ^= 1;  // 1<->0
+
+        if (h->deblocking_filter) {
+            h->slice_alpha_c0_offset += get_se_golomb(&h->gb) << 1;
+            h->slice_beta_offset     += get_se_golomb(&h->gb) << 1;
+            if (h->slice_alpha_c0_offset > 104U ||
+                h->slice_beta_offset     > 104U) {
+                av_log(h->avctx, AV_LOG_ERROR,
+                       "deblocking filter parameters %d %d out of range\n",
+                       h->slice_alpha_c0_offset, h->slice_beta_offset);
+                return -1;
+            }
+        }
+    }
+
+    if (h->avctx->skip_loop_filter >= AVDISCARD_ALL ||
+        (h->avctx->skip_loop_filter >= AVDISCARD_NONKEY &&
+         h->slice_type_nos != AV_PICTURE_TYPE_I) ||
+        (h->avctx->skip_loop_filter >= AVDISCARD_BIDIR  &&
+         h->slice_type_nos == AV_PICTURE_TYPE_B) ||
+        (h->avctx->skip_loop_filter >= AVDISCARD_NONREF &&
+         h->nal_ref_idc == 0))
+        h->deblocking_filter = 0;
+
+    if (h->deblocking_filter == 1 && h0->max_contexts > 1) {
+        if (h->avctx->flags2 & CODEC_FLAG2_FAST) {
+            /* Cheat slightly for speed:
+             * Do not bother to deblock across slices. */
+            h->deblocking_filter = 2;
+        } else {
+            h0->max_contexts = 1;
+            if (!h0->single_decode_warning) {
+                av_log(h->avctx, AV_LOG_INFO,
+                       "Cannot parallelize deblocking type 1, decoding such frames in sequential order\n");
+                h0->single_decode_warning = 1;
+            }
+            if (h != h0) {
+                av_log(h->avctx, AV_LOG_ERROR,
+                       "Deblocking switched inside frame.\n");
+                return 1;
+            }
+        }
+    }
+    h->qp_thresh = 15 + 52 -
+                   FFMIN(h->slice_alpha_c0_offset, h->slice_beta_offset) -
+                   FFMAX3(0,
+                          h->pps.chroma_qp_index_offset[0],
+                          h->pps.chroma_qp_index_offset[1]) +
+                   6 * (h->sps.bit_depth_luma - 8);
+
+    h0->last_slice_type = slice_type;
+    memcpy(h0->last_ref_count, h0->ref_count, sizeof(h0->last_ref_count));
+    h->slice_num = ++h0->current_slice;
+
+    if (h->slice_num)
+        h0->slice_row[(h->slice_num-1)&(MAX_SLICES-1)]= h->resync_mb_y;
+    if (   h0->slice_row[h->slice_num&(MAX_SLICES-1)] + 3 >= h->resync_mb_y
+        && h0->slice_row[h->slice_num&(MAX_SLICES-1)] <= h->resync_mb_y
+        && h->slice_num >= MAX_SLICES) {
+        //in case of ASO this check needs to be updated depending on how we decide to assign slice numbers in this case
+        av_log(h->avctx, AV_LOG_WARNING, "Possibly too many slices (%d >= %d), increase MAX_SLICES and recompile if there are artifacts\n", h->slice_num, MAX_SLICES);
+    }
+
+    for (j = 0; j < 2; j++) {
+        int id_list[16];
+        int *ref2frm = h->ref2frm[h->slice_num & (MAX_SLICES - 1)][j];
+        for (i = 0; i < 16; i++) {
+            id_list[i] = 60;
+            if (j < h->list_count && i < h->ref_count[j] && h->ref_list[j][i].f.buf[0]) {
+                int k;
+                AVBuffer *buf = h->ref_list[j][i].f.buf[0]->buffer;
+                for (k = 0; k < h->short_ref_count; k++)
+                    if (h->short_ref[k]->f.buf[0]->buffer == buf) {
+                        id_list[i] = k;
+                        break;
+                    }
+                for (k = 0; k < h->long_ref_count; k++)
+                    if (h->long_ref[k] && h->long_ref[k]->f.buf[0]->buffer == buf) {
+                        id_list[i] = h->short_ref_count + k;
+                        break;
+                    }
+            }
+        }
+
+        ref2frm[0]     =
+            ref2frm[1] = -1;
+        for (i = 0; i < 16; i++)
+            ref2frm[i + 2] = 4 * id_list[i] +
+                             (h->ref_list[j][i].reference & 3);
+        ref2frm[18 + 0]     =
+            ref2frm[18 + 1] = -1;
+        for (i = 16; i < 48; i++)
+            ref2frm[i + 4] = 4 * id_list[(i - 16) >> 1] +
+                             (h->ref_list[j][i].reference & 3);
+    }
+
+    if (h->ref_count[0]) h->er.last_pic = &h->ref_list[0][0];
+    if (h->ref_count[1]) h->er.next_pic = &h->ref_list[1][0];
+
+    if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
+        av_log(h->avctx, AV_LOG_DEBUG,
+               "slice:%d %s mb:%d %c%s%s pps:%u frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d:%d:%d weight:%d%s %s\n",
+               h->slice_num,
+               (h->picture_structure == PICT_FRAME ? "F" : h->picture_structure == PICT_TOP_FIELD ? "T" : "B"),
+               first_mb_in_slice,
+               av_get_picture_type_char(h->slice_type),
+               h->slice_type_fixed ? " fix" : "",
+               h->nal_unit_type == NAL_IDR_SLICE ? " IDR" : "",
+               pps_id, h->frame_num,
+               h->cur_pic_ptr->field_poc[0],
+               h->cur_pic_ptr->field_poc[1],
+               h->ref_count[0], h->ref_count[1],
+               h->qscale,
+               h->deblocking_filter,
+               h->slice_alpha_c0_offset / 2 - 26, h->slice_beta_offset / 2 - 26,
+               h->use_weight,
+               h->use_weight == 1 && h->use_weight_chroma ? "c" : "",
+               h->slice_type == AV_PICTURE_TYPE_B ? (h->direct_spatial_mv_pred ? "SPAT" : "TEMP") : "");
+    }
+
+    return 0;
+}
+
+int ff_h264_get_slice_type(const H264Context *h)
+{
+    switch (h->slice_type) {
+    case AV_PICTURE_TYPE_P:
+        return 0;
+    case AV_PICTURE_TYPE_B:
+        return 1;
+    case AV_PICTURE_TYPE_I:
+        return 2;
+    case AV_PICTURE_TYPE_SP:
+        return 3;
+    case AV_PICTURE_TYPE_SI:
+        return 4;
+    default:
+        return -1;
+    }
+}
+
+static av_always_inline void fill_filter_caches_inter(H264Context *h,
+                                                      int mb_type, int top_xy,
+                                                      int left_xy[LEFT_MBS],
+                                                      int top_type,
+                                                      int left_type[LEFT_MBS],
+                                                      int mb_xy, int list)
+{
+    int b_stride = h->b_stride;
+    int16_t(*mv_dst)[2] = &h->mv_cache[list][scan8[0]];
+    int8_t *ref_cache = &h->ref_cache[list][scan8[0]];
+    if (IS_INTER(mb_type) || IS_DIRECT(mb_type)) {
+        if (USES_LIST(top_type, list)) {
+            const int b_xy  = h->mb2b_xy[top_xy] + 3 * b_stride;
+            const int b8_xy = 4 * top_xy + 2;
+            int (*ref2frm)[64] = (void*)(h->ref2frm[h->slice_table[top_xy] & (MAX_SLICES - 1)][0] + (MB_MBAFF(h) ? 20 : 2));
+            AV_COPY128(mv_dst - 1 * 8, h->cur_pic.motion_val[list][b_xy + 0]);
+            ref_cache[0 - 1 * 8] =
+            ref_cache[1 - 1 * 8] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 0]];
+            ref_cache[2 - 1 * 8] =
+            ref_cache[3 - 1 * 8] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 1]];
+        } else {
+            AV_ZERO128(mv_dst - 1 * 8);
+            AV_WN32A(&ref_cache[0 - 1 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
+        }
+
+        if (!IS_INTERLACED(mb_type ^ left_type[LTOP])) {
+            if (USES_LIST(left_type[LTOP], list)) {
+                const int b_xy  = h->mb2b_xy[left_xy[LTOP]] + 3;
+                const int b8_xy = 4 * left_xy[LTOP] + 1;
+                int (*ref2frm)[64] =(void*)( h->ref2frm[h->slice_table[left_xy[LTOP]] & (MAX_SLICES - 1)][0] + (MB_MBAFF(h) ? 20 : 2));
+                AV_COPY32(mv_dst - 1 +  0, h->cur_pic.motion_val[list][b_xy + b_stride * 0]);
+                AV_COPY32(mv_dst - 1 +  8, h->cur_pic.motion_val[list][b_xy + b_stride * 1]);
+                AV_COPY32(mv_dst - 1 + 16, h->cur_pic.motion_val[list][b_xy + b_stride * 2]);
+                AV_COPY32(mv_dst - 1 + 24, h->cur_pic.motion_val[list][b_xy + b_stride * 3]);
+                ref_cache[-1 +  0] =
+                ref_cache[-1 +  8] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 2 * 0]];
+                ref_cache[-1 + 16] =
+                ref_cache[-1 + 24] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 2 * 1]];
+            } else {
+                AV_ZERO32(mv_dst - 1 +  0);
+                AV_ZERO32(mv_dst - 1 +  8);
+                AV_ZERO32(mv_dst - 1 + 16);
+                AV_ZERO32(mv_dst - 1 + 24);
+                ref_cache[-1 +  0] =
+                ref_cache[-1 +  8] =
+                ref_cache[-1 + 16] =
+                ref_cache[-1 + 24] = LIST_NOT_USED;
+            }
+        }
+    }
+
+    if (!USES_LIST(mb_type, list)) {
+        fill_rectangle(mv_dst, 4, 4, 8, pack16to32(0, 0), 4);
+        AV_WN32A(&ref_cache[0 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
+        AV_WN32A(&ref_cache[1 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
+        AV_WN32A(&ref_cache[2 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
+        AV_WN32A(&ref_cache[3 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
+        return;
+    }
+
+    {
+        int8_t *ref = &h->cur_pic.ref_index[list][4 * mb_xy];
+        int (*ref2frm)[64] = (void*)(h->ref2frm[h->slice_num & (MAX_SLICES - 1)][0] + (MB_MBAFF(h) ? 20 : 2));
+        uint32_t ref01 = (pack16to32(ref2frm[list][ref[0]], ref2frm[list][ref[1]]) & 0x00FF00FF) * 0x0101;
+        uint32_t ref23 = (pack16to32(ref2frm[list][ref[2]], ref2frm[list][ref[3]]) & 0x00FF00FF) * 0x0101;
+        AV_WN32A(&ref_cache[0 * 8], ref01);
+        AV_WN32A(&ref_cache[1 * 8], ref01);
+        AV_WN32A(&ref_cache[2 * 8], ref23);
+        AV_WN32A(&ref_cache[3 * 8], ref23);
+    }
+
+    {
+        int16_t(*mv_src)[2] = &h->cur_pic.motion_val[list][4 * h->mb_x + 4 * h->mb_y * b_stride];
+        AV_COPY128(mv_dst + 8 * 0, mv_src + 0 * b_stride);
+        AV_COPY128(mv_dst + 8 * 1, mv_src + 1 * b_stride);
+        AV_COPY128(mv_dst + 8 * 2, mv_src + 2 * b_stride);
+        AV_COPY128(mv_dst + 8 * 3, mv_src + 3 * b_stride);
+    }
+}
+
+/**
+ *
+ * @return non zero if the loop filter can be skipped
+ */
+static int fill_filter_caches(H264Context *h, int mb_type)
+{
+    const int mb_xy = h->mb_xy;
+    int top_xy, left_xy[LEFT_MBS];
+    int top_type, left_type[LEFT_MBS];
+    uint8_t *nnz;
+    uint8_t *nnz_cache;
+
+    top_xy = mb_xy - (h->mb_stride << MB_FIELD(h));
+
+    /* Wow, what a mess, why didn't they simplify the interlacing & intra
+     * stuff, I can't imagine that these complex rules are worth it. */
+
+    left_xy[LBOT] = left_xy[LTOP] = mb_xy - 1;
+    if (FRAME_MBAFF(h)) {
+        const int left_mb_field_flag = IS_INTERLACED(h->cur_pic.mb_type[mb_xy - 1]);
+        const int curr_mb_field_flag = IS_INTERLACED(mb_type);
+        if (h->mb_y & 1) {
+            if (left_mb_field_flag != curr_mb_field_flag)
+                left_xy[LTOP] -= h->mb_stride;
+        } else {
+            if (curr_mb_field_flag)
+                top_xy += h->mb_stride &
+                    (((h->cur_pic.mb_type[top_xy] >> 7) & 1) - 1);
+            if (left_mb_field_flag != curr_mb_field_flag)
+                left_xy[LBOT] += h->mb_stride;
+        }
+    }
+
+    h->top_mb_xy        = top_xy;
+    h->left_mb_xy[LTOP] = left_xy[LTOP];
+    h->left_mb_xy[LBOT] = left_xy[LBOT];
+    {
+        /* For sufficiently low qp, filtering wouldn't do anything.
+         * This is a conservative estimate: could also check beta_offset
+         * and more accurate chroma_qp. */
+        int qp_thresh = h->qp_thresh; // FIXME strictly we should store qp_thresh for each mb of a slice
+        int qp        = h->cur_pic.qscale_table[mb_xy];
+        if (qp <= qp_thresh &&
+            (left_xy[LTOP] < 0 ||
+             ((qp + h->cur_pic.qscale_table[left_xy[LTOP]] + 1) >> 1) <= qp_thresh) &&
+            (top_xy < 0 ||
+             ((qp + h->cur_pic.qscale_table[top_xy] + 1) >> 1) <= qp_thresh)) {
+            if (!FRAME_MBAFF(h))
+                return 1;
+            if ((left_xy[LTOP] < 0 ||
+                 ((qp + h->cur_pic.qscale_table[left_xy[LBOT]] + 1) >> 1) <= qp_thresh) &&
+                (top_xy < h->mb_stride ||
+                 ((qp + h->cur_pic.qscale_table[top_xy - h->mb_stride] + 1) >> 1) <= qp_thresh))
+                return 1;
+        }
+    }
+
+    top_type        = h->cur_pic.mb_type[top_xy];
+    left_type[LTOP] = h->cur_pic.mb_type[left_xy[LTOP]];
+    left_type[LBOT] = h->cur_pic.mb_type[left_xy[LBOT]];
+    if (h->deblocking_filter == 2) {
+        if (h->slice_table[top_xy] != h->slice_num)
+            top_type = 0;
+        if (h->slice_table[left_xy[LBOT]] != h->slice_num)
+            left_type[LTOP] = left_type[LBOT] = 0;
+    } else {
+        if (h->slice_table[top_xy] == 0xFFFF)
+            top_type = 0;
+        if (h->slice_table[left_xy[LBOT]] == 0xFFFF)
+            left_type[LTOP] = left_type[LBOT] = 0;
+    }
+    h->top_type        = top_type;
+    h->left_type[LTOP] = left_type[LTOP];
+    h->left_type[LBOT] = left_type[LBOT];
+
+    if (IS_INTRA(mb_type))
+        return 0;
+
+    fill_filter_caches_inter(h, mb_type, top_xy, left_xy,
+                             top_type, left_type, mb_xy, 0);
+    if (h->list_count == 2)
+        fill_filter_caches_inter(h, mb_type, top_xy, left_xy,
+                                 top_type, left_type, mb_xy, 1);
+
+    nnz       = h->non_zero_count[mb_xy];
+    nnz_cache = h->non_zero_count_cache;
+    AV_COPY32(&nnz_cache[4 + 8 * 1], &nnz[0]);
+    AV_COPY32(&nnz_cache[4 + 8 * 2], &nnz[4]);
+    AV_COPY32(&nnz_cache[4 + 8 * 3], &nnz[8]);
+    AV_COPY32(&nnz_cache[4 + 8 * 4], &nnz[12]);
+    h->cbp = h->cbp_table[mb_xy];
+
+    if (top_type) {
+        nnz = h->non_zero_count[top_xy];
+        AV_COPY32(&nnz_cache[4 + 8 * 0], &nnz[3 * 4]);
+    }
+
+    if (left_type[LTOP]) {
+        nnz = h->non_zero_count[left_xy[LTOP]];
+        nnz_cache[3 + 8 * 1] = nnz[3 + 0 * 4];
+        nnz_cache[3 + 8 * 2] = nnz[3 + 1 * 4];
+        nnz_cache[3 + 8 * 3] = nnz[3 + 2 * 4];
+        nnz_cache[3 + 8 * 4] = nnz[3 + 3 * 4];
+    }
+
+    /* CAVLC 8x8dct requires NNZ values for residual decoding that differ
+     * from what the loop filter needs */
+    if (!CABAC(h) && h->pps.transform_8x8_mode) {
+        if (IS_8x8DCT(top_type)) {
+            nnz_cache[4 + 8 * 0]     =
+                nnz_cache[5 + 8 * 0] = (h->cbp_table[top_xy] & 0x4000) >> 12;
+            nnz_cache[6 + 8 * 0]     =
+                nnz_cache[7 + 8 * 0] = (h->cbp_table[top_xy] & 0x8000) >> 12;
+        }
+        if (IS_8x8DCT(left_type[LTOP])) {
+            nnz_cache[3 + 8 * 1]     =
+                nnz_cache[3 + 8 * 2] = (h->cbp_table[left_xy[LTOP]] & 0x2000) >> 12; // FIXME check MBAFF
+        }
+        if (IS_8x8DCT(left_type[LBOT])) {
+            nnz_cache[3 + 8 * 3]     =
+                nnz_cache[3 + 8 * 4] = (h->cbp_table[left_xy[LBOT]] & 0x8000) >> 12; // FIXME check MBAFF
+        }
+
+        if (IS_8x8DCT(mb_type)) {
+            nnz_cache[scan8[0]] =
+            nnz_cache[scan8[1]] =
+            nnz_cache[scan8[2]] =
+            nnz_cache[scan8[3]] = (h->cbp & 0x1000) >> 12;
+
+            nnz_cache[scan8[0 + 4]] =
+            nnz_cache[scan8[1 + 4]] =
+            nnz_cache[scan8[2 + 4]] =
+            nnz_cache[scan8[3 + 4]] = (h->cbp & 0x2000) >> 12;
+
+            nnz_cache[scan8[0 + 8]] =
+            nnz_cache[scan8[1 + 8]] =
+            nnz_cache[scan8[2 + 8]] =
+            nnz_cache[scan8[3 + 8]] = (h->cbp & 0x4000) >> 12;
+
+            nnz_cache[scan8[0 + 12]] =
+            nnz_cache[scan8[1 + 12]] =
+            nnz_cache[scan8[2 + 12]] =
+            nnz_cache[scan8[3 + 12]] = (h->cbp & 0x8000) >> 12;
+        }
+    }
+
+    return 0;
+}
+
+static void loop_filter(H264Context *h, int start_x, int end_x)
+{
+    uint8_t *dest_y, *dest_cb, *dest_cr;
+    int linesize, uvlinesize, mb_x, mb_y;
+    const int end_mb_y       = h->mb_y + FRAME_MBAFF(h);
+    const int old_slice_type = h->slice_type;
+    const int pixel_shift    = h->pixel_shift;
+    const int block_h        = 16 >> h->chroma_y_shift;
+
+    if (h->deblocking_filter) {
+        for (mb_x = start_x; mb_x < end_x; mb_x++)
+            for (mb_y = end_mb_y - FRAME_MBAFF(h); mb_y <= end_mb_y; mb_y++) {
+                int mb_xy, mb_type;
+                mb_xy         = h->mb_xy = mb_x + mb_y * h->mb_stride;
+                h->slice_num  = h->slice_table[mb_xy];
+                mb_type       = h->cur_pic.mb_type[mb_xy];
+                h->list_count = h->list_counts[mb_xy];
+
+                if (FRAME_MBAFF(h))
+                    h->mb_mbaff               =
+                    h->mb_field_decoding_flag = !!IS_INTERLACED(mb_type);
+
+                h->mb_x = mb_x;
+                h->mb_y = mb_y;
+                dest_y  = h->cur_pic.f.data[0] +
+                          ((mb_x << pixel_shift) + mb_y * h->linesize) * 16;
+                dest_cb = h->cur_pic.f.data[1] +
+                          (mb_x << pixel_shift) * (8 << CHROMA444(h)) +
+                          mb_y * h->uvlinesize * block_h;
+                dest_cr = h->cur_pic.f.data[2] +
+                          (mb_x << pixel_shift) * (8 << CHROMA444(h)) +
+                          mb_y * h->uvlinesize * block_h;
+                // FIXME simplify above
+
+                if (MB_FIELD(h)) {
+                    linesize   = h->mb_linesize   = h->linesize   * 2;
+                    uvlinesize = h->mb_uvlinesize = h->uvlinesize * 2;
+                    if (mb_y & 1) { // FIXME move out of this function?
+                        dest_y  -= h->linesize   * 15;
+                        dest_cb -= h->uvlinesize * (block_h - 1);
+                        dest_cr -= h->uvlinesize * (block_h - 1);
+                    }
+                } else {
+                    linesize   = h->mb_linesize   = h->linesize;
+                    uvlinesize = h->mb_uvlinesize = h->uvlinesize;
+                }
+                backup_mb_border(h, dest_y, dest_cb, dest_cr, linesize,
+                                 uvlinesize, 0);
+                if (fill_filter_caches(h, mb_type))
+                    continue;
+                h->chroma_qp[0] = get_chroma_qp(h, 0, h->cur_pic.qscale_table[mb_xy]);
+                h->chroma_qp[1] = get_chroma_qp(h, 1, h->cur_pic.qscale_table[mb_xy]);
+
+                if (FRAME_MBAFF(h)) {
+                    ff_h264_filter_mb(h, mb_x, mb_y, dest_y, dest_cb, dest_cr,
+                                      linesize, uvlinesize);
+                } else {
+                    ff_h264_filter_mb_fast(h, mb_x, mb_y, dest_y, dest_cb,
+                                           dest_cr, linesize, uvlinesize);
+                }
+            }
+    }
+    h->slice_type   = old_slice_type;
+    h->mb_x         = end_x;
+    h->mb_y         = end_mb_y - FRAME_MBAFF(h);
+    h->chroma_qp[0] = get_chroma_qp(h, 0, h->qscale);
+    h->chroma_qp[1] = get_chroma_qp(h, 1, h->qscale);
+}
+
+static void predict_field_decoding_flag(H264Context *h)
+{
+    const int mb_xy = h->mb_x + h->mb_y * h->mb_stride;
+    int mb_type     = (h->slice_table[mb_xy - 1] == h->slice_num) ?
+                      h->cur_pic.mb_type[mb_xy - 1] :
+                      (h->slice_table[mb_xy - h->mb_stride] == h->slice_num) ?
+                      h->cur_pic.mb_type[mb_xy - h->mb_stride] : 0;
+    h->mb_mbaff     = h->mb_field_decoding_flag = IS_INTERLACED(mb_type) ? 1 : 0;
+}
+
+/**
+ * Draw edges and report progress for the last MB row.
+ */
+static void decode_finish_row(H264Context *h)
+{
+    int top            = 16 * (h->mb_y      >> FIELD_PICTURE(h));
+    int pic_height     = 16 *  h->mb_height >> FIELD_PICTURE(h);
+    int height         =  16      << FRAME_MBAFF(h);
+    int deblock_border = (16 + 4) << FRAME_MBAFF(h);
+
+    if (h->deblocking_filter) {
+        if ((top + height) >= pic_height)
+            height += deblock_border;
+        top -= deblock_border;
+    }
+
+    if (top >= pic_height || (top + height) < 0)
+        return;
+
+    height = FFMIN(height, pic_height - top);
+    if (top < 0) {
+        height = top + height;
+        top    = 0;
+    }
+
+    ff_h264_draw_horiz_band(h, top, height);
+
+    if (h->droppable || h->er.error_occurred)
+        return;
+
+    ff_thread_report_progress(&h->cur_pic_ptr->tf, top + height - 1,
+                              h->picture_structure == PICT_BOTTOM_FIELD);
+}
+
+static void er_add_slice(H264Context *h, int startx, int starty,
+                         int endx, int endy, int status)
+{
+    if (CONFIG_ERROR_RESILIENCE) {
+        ERContext *er = &h->er;
+
+        er->ref_count = h->ref_count[0];
+        ff_er_add_slice(er, startx, starty, endx, endy, status);
+    }
+}
+
+static int decode_slice(struct AVCodecContext *avctx, void *arg)
+{
+    H264Context *h = *(void **)arg;
+    int lf_x_start = h->mb_x;
+
+    h->mb_skip_run = -1;
+
+    av_assert0(h->block_offset[15] == (4 * ((scan8[15] - scan8[0]) & 7) << h->pixel_shift) + 4 * h->linesize * ((scan8[15] - scan8[0]) >> 3));
+
+    h->is_complex = FRAME_MBAFF(h) || h->picture_structure != PICT_FRAME ||
+                    avctx->codec_id != AV_CODEC_ID_H264 ||
+                    (CONFIG_GRAY && (h->flags & CODEC_FLAG_GRAY));
+
+    if (!(h->avctx->active_thread_type & FF_THREAD_SLICE) && h->picture_structure == PICT_FRAME) {
+        const int start_i  = av_clip(h->resync_mb_x + h->resync_mb_y * h->mb_width, 0, h->mb_num - 1);
+        if (start_i) {
+            int prev_status = h->er.error_status_table[h->er.mb_index2xy[start_i - 1]];
+            prev_status &= ~ VP_START;
+            if (prev_status != (ER_MV_END | ER_DC_END | ER_AC_END))
+                h->er.error_occurred = 1;
+        }
+    }
+
+    if (h->pps.cabac) {
+        /* realign */
+        align_get_bits(&h->gb);
+
+        /* init cabac */
+        ff_init_cabac_decoder(&h->cabac,
+                              h->gb.buffer + get_bits_count(&h->gb) / 8,
+                              (get_bits_left(&h->gb) + 7) / 8);
+
+        ff_h264_init_cabac_states(h);
+
+        for (;;) {
+            // START_TIMER
+            int ret = ff_h264_decode_mb_cabac(h);
+            int eos;
+            // STOP_TIMER("decode_mb_cabac")
+
+            if (ret >= 0)
+                ff_h264_hl_decode_mb(h);
+
+            // FIXME optimal? or let mb_decode decode 16x32 ?
+            if (ret >= 0 && FRAME_MBAFF(h)) {
+                h->mb_y++;
+
+                ret = ff_h264_decode_mb_cabac(h);
+
+                if (ret >= 0)
+                    ff_h264_hl_decode_mb(h);
+                h->mb_y--;
+            }
+            eos = get_cabac_terminate(&h->cabac);
+
+            if ((h->workaround_bugs & FF_BUG_TRUNCATED) &&
+                h->cabac.bytestream > h->cabac.bytestream_end + 2) {
+                er_add_slice(h, h->resync_mb_x, h->resync_mb_y, h->mb_x - 1,
+                                h->mb_y, ER_MB_END);
+                if (h->mb_x >= lf_x_start)
+                    loop_filter(h, lf_x_start, h->mb_x + 1);
+                return 0;
+            }
+            if (h->cabac.bytestream > h->cabac.bytestream_end + 2 )
+                av_log(h->avctx, AV_LOG_DEBUG, "bytestream overread %td\n", h->cabac.bytestream_end - h->cabac.bytestream);
+            if (ret < 0 || h->cabac.bytestream > h->cabac.bytestream_end + 4) {
+                av_log(h->avctx, AV_LOG_ERROR,
+                       "error while decoding MB %d %d, bytestream (%td)\n",
+                       h->mb_x, h->mb_y,
+                       h->cabac.bytestream_end - h->cabac.bytestream);
+                er_add_slice(h, h->resync_mb_x, h->resync_mb_y, h->mb_x,
+                                h->mb_y, ER_MB_ERROR);
+                return -1;
+            }
+
+            if (++h->mb_x >= h->mb_width) {
+                loop_filter(h, lf_x_start, h->mb_x);
+                h->mb_x = lf_x_start = 0;
+                decode_finish_row(h);
+                ++h->mb_y;
+                if (FIELD_OR_MBAFF_PICTURE(h)) {
+                    ++h->mb_y;
+                    if (FRAME_MBAFF(h) && h->mb_y < h->mb_height)
+                        predict_field_decoding_flag(h);
+                }
+            }
+
+            if (eos || h->mb_y >= h->mb_height) {
+                tprintf(h->avctx, "slice end %d %d\n",
+                        get_bits_count(&h->gb), h->gb.size_in_bits);
+                er_add_slice(h, h->resync_mb_x, h->resync_mb_y, h->mb_x - 1,
+                                h->mb_y, ER_MB_END);
+                if (h->mb_x > lf_x_start)
+                    loop_filter(h, lf_x_start, h->mb_x);
+                return 0;
+            }
+        }
+    } else {
+        for (;;) {
+            int ret = ff_h264_decode_mb_cavlc(h);
+
+            if (ret >= 0)
+                ff_h264_hl_decode_mb(h);
+
+            // FIXME optimal? or let mb_decode decode 16x32 ?
+            if (ret >= 0 && FRAME_MBAFF(h)) {
+                h->mb_y++;
+                ret = ff_h264_decode_mb_cavlc(h);
+
+                if (ret >= 0)
+                    ff_h264_hl_decode_mb(h);
+                h->mb_y--;
+            }
+
+            if (ret < 0) {
+                av_log(h->avctx, AV_LOG_ERROR,
+                       "error while decoding MB %d %d\n", h->mb_x, h->mb_y);
+                er_add_slice(h, h->resync_mb_x, h->resync_mb_y, h->mb_x,
+                                h->mb_y, ER_MB_ERROR);
+                return -1;
+            }
+
+            if (++h->mb_x >= h->mb_width) {
+                loop_filter(h, lf_x_start, h->mb_x);
+                h->mb_x = lf_x_start = 0;
+                decode_finish_row(h);
+                ++h->mb_y;
+                if (FIELD_OR_MBAFF_PICTURE(h)) {
+                    ++h->mb_y;
+                    if (FRAME_MBAFF(h) && h->mb_y < h->mb_height)
+                        predict_field_decoding_flag(h);
+                }
+                if (h->mb_y >= h->mb_height) {
+                    tprintf(h->avctx, "slice end %d %d\n",
+                            get_bits_count(&h->gb), h->gb.size_in_bits);
+
+                    if (   get_bits_left(&h->gb) == 0
+                        || get_bits_left(&h->gb) > 0 && !(h->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
+                        er_add_slice(h, h->resync_mb_x, h->resync_mb_y,
+                                        h->mb_x - 1, h->mb_y,
+                                        ER_MB_END);
+
+                        return 0;
+                    } else {
+                        er_add_slice(h, h->resync_mb_x, h->resync_mb_y,
+                                        h->mb_x, h->mb_y,
+                                        ER_MB_END);
+
+                        return -1;
+                    }
+                }
+            }
+
+            if (get_bits_left(&h->gb) <= 0 && h->mb_skip_run <= 0) {
+                tprintf(h->avctx, "slice end %d %d\n",
+                        get_bits_count(&h->gb), h->gb.size_in_bits);
+                if (get_bits_left(&h->gb) == 0) {
+                    er_add_slice(h, h->resync_mb_x, h->resync_mb_y,
+                                    h->mb_x - 1, h->mb_y,
+                                    ER_MB_END);
+                    if (h->mb_x > lf_x_start)
+                        loop_filter(h, lf_x_start, h->mb_x);
+
+                    return 0;
+                } else {
+                    er_add_slice(h, h->resync_mb_x, h->resync_mb_y, h->mb_x,
+                                    h->mb_y, ER_MB_ERROR);
+
+                    return -1;
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Call decode_slice() for each context.
+ *
+ * @param h h264 master context
+ * @param context_count number of contexts to execute
+ */
+static int execute_decode_slices(H264Context *h, int context_count)
+{
+    AVCodecContext *const avctx = h->avctx;
+    H264Context *hx;
+    int i;
+
+    if (h->avctx->hwaccel ||
+        h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
+        return 0;
+    if (context_count == 1) {
+        return decode_slice(avctx, &h);
+    } else {
+        av_assert0(context_count > 0);
+        for (i = 1; i < context_count; i++) {
+            hx                    = h->thread_context[i];
+            if (CONFIG_ERROR_RESILIENCE) {
+                hx->er.error_count = 0;
+            }
+            hx->x264_build        = h->x264_build;
+        }
+
+        avctx->execute(avctx, decode_slice, h->thread_context,
+                       NULL, context_count, sizeof(void *));
+
+        /* pull back stuff from slices to master context */
+        hx                   = h->thread_context[context_count - 1];
+        h->mb_x              = hx->mb_x;
+        h->mb_y              = hx->mb_y;
+        h->droppable         = hx->droppable;
+        h->picture_structure = hx->picture_structure;
+        if (CONFIG_ERROR_RESILIENCE) {
+            for (i = 1; i < context_count; i++)
+                h->er.error_count += h->thread_context[i]->er.error_count;
+        }
+    }
+
+    return 0;
+}
+
+static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
+                            int parse_extradata)
+{
+    AVCodecContext *const avctx = h->avctx;
+    H264Context *hx; ///< thread context
+    int buf_index;
+    int context_count;
+    int next_avc;
+    int pass = !(avctx->active_thread_type & FF_THREAD_FRAME);
+    int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
+    int nal_index;
+    int idr_cleared=0;
+    int first_slice = 0;
+
+    h->nal_unit_type= 0;
+
+    if(!h->slice_context_count)
+         h->slice_context_count= 1;
+    h->max_contexts = h->slice_context_count;
+    if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS)) {
+        h->current_slice = 0;
+        if (!h->first_field)
+            h->cur_pic_ptr = NULL;
+        ff_h264_reset_sei(h);
+    }
+
+    if (h->nal_length_size == 4) {
+        if (buf_size > 8 && AV_RB32(buf) == 1 && AV_RB32(buf+5) > (unsigned)buf_size) {
+            h->is_avc = 0;
+        }else if(buf_size > 3 && AV_RB32(buf) > 1 && AV_RB32(buf) <= (unsigned)buf_size)
+            h->is_avc = 1;
+    }
+
+    for (; pass <= 1; pass++) {
+        buf_index     = 0;
+        context_count = 0;
+        next_avc      = h->is_avc ? 0 : buf_size;
+        nal_index     = 0;
+        for (;;) {
+            int consumed;
+            int dst_length;
+            int bit_length;
+            const uint8_t *ptr;
+            int i, nalsize = 0;
+            int err;
+
+            if (buf_index >= next_avc) {
+                if (buf_index >= buf_size - h->nal_length_size)
+                    break;
+                nalsize = 0;
+                for (i = 0; i < h->nal_length_size; i++)
+                    nalsize = (nalsize << 8) | buf[buf_index++];
+                if (nalsize <= 0 || nalsize > buf_size - buf_index) {
+                    av_log(h->avctx, AV_LOG_ERROR,
+                           "AVC: nal size %d\n", nalsize);
+                    break;
+                }
+                next_avc = buf_index + nalsize;
+            } else {
+                // start code prefix search
+                for (; buf_index + 3 < next_avc; buf_index++)
+                    // This should always succeed in the first iteration.
+                    if (buf[buf_index]     == 0 &&
+                        buf[buf_index + 1] == 0 &&
+                        buf[buf_index + 2] == 1)
+                        break;
+
+                if (buf_index + 3 >= buf_size) {
+                    buf_index = buf_size;
+                    break;
+                }
+
+                buf_index += 3;
+                if (buf_index >= next_avc)
+                    continue;
+            }
+
+            hx = h->thread_context[context_count];
+
+            ptr = ff_h264_decode_nal(hx, buf + buf_index, &dst_length,
+                                     &consumed, next_avc - buf_index);
+            if (ptr == NULL || dst_length < 0) {
+                buf_index = -1;
+                goto end;
+            }
+            i = buf_index + consumed;
+            if ((h->workaround_bugs & FF_BUG_AUTODETECT) && i + 3 < next_avc &&
+                buf[i]     == 0x00 && buf[i + 1] == 0x00 &&
+                buf[i + 2] == 0x01 && buf[i + 3] == 0xE0)
+                h->workaround_bugs |= FF_BUG_TRUNCATED;
+
+            if (!(h->workaround_bugs & FF_BUG_TRUNCATED))
+                while(dst_length > 0 && ptr[dst_length - 1] == 0)
+                    dst_length--;
+            bit_length = !dst_length ? 0
+                                     : (8 * dst_length -
+                                        decode_rbsp_trailing(h, ptr + dst_length - 1));
+
+            if (h->avctx->debug & FF_DEBUG_STARTCODE)
+                av_log(h->avctx, AV_LOG_DEBUG, "NAL %d/%d at %d/%d length %d pass %d\n", hx->nal_unit_type, hx->nal_ref_idc, buf_index, buf_size, dst_length, pass);
+
+            if (h->is_avc && (nalsize != consumed) && nalsize)
+                av_log(h->avctx, AV_LOG_DEBUG,
+                       "AVC: Consumed only %d bytes instead of %d\n",
+                       consumed, nalsize);
+
+            buf_index += consumed;
+            nal_index++;
+
+            if (pass == 0) {
+                /* packets can sometimes contain multiple PPS/SPS,
+                 * e.g. two PAFF field pictures in one packet, or a demuxer
+                 * which splits NALs strangely if so, when frame threading we
+                 * can't start the next thread until we've read all of them */
+                switch (hx->nal_unit_type) {
+                case NAL_SPS:
+                case NAL_PPS:
+                    nals_needed = nal_index;
+                    break;
+                case NAL_DPA:
+                case NAL_IDR_SLICE:
+                case NAL_SLICE:
+                    init_get_bits(&hx->gb, ptr, bit_length);
+                    if (!get_ue_golomb(&hx->gb) || !first_slice)
+                        nals_needed = nal_index;
+                    if (!first_slice)
+                        first_slice = hx->nal_unit_type;
+                }
+                continue;
+            }
+
+            if (!first_slice)
+                switch (hx->nal_unit_type) {
+                case NAL_DPA:
+                case NAL_IDR_SLICE:
+                case NAL_SLICE:
+                    first_slice = hx->nal_unit_type;
+                }
+
+            // FIXME do not discard SEI id
+            if (avctx->skip_frame >= AVDISCARD_NONREF && h->nal_ref_idc == 0)
+                continue;
+
+again:
+            /* Ignore per frame NAL unit type during extradata
+             * parsing. Decoding slices is not possible in codec init
+             * with frame-mt */
+            if (parse_extradata) {
+                switch (hx->nal_unit_type) {
+                case NAL_IDR_SLICE:
+                case NAL_SLICE:
+                case NAL_DPA:
+                case NAL_DPB:
+                case NAL_DPC:
+                case NAL_AUXILIARY_SLICE:
+                    av_log(h->avctx, AV_LOG_WARNING, "Ignoring NAL %d in global header/extradata\n", hx->nal_unit_type);
+                    hx->nal_unit_type = NAL_FF_IGNORE;
+                }
+            }
+
+            err = 0;
+
+            switch (hx->nal_unit_type) {
+            case NAL_IDR_SLICE:
+                if (first_slice != NAL_IDR_SLICE) {
+                    av_log(h->avctx, AV_LOG_ERROR,
+                           "Invalid mix of idr and non-idr slices\n");
+                    buf_index = -1;
+                    goto end;
+                }
+                if(!idr_cleared)
+                    idr(h); // FIXME ensure we don't lose some frames if there is reordering
+                idr_cleared = 1;
+            case NAL_SLICE:
+                init_get_bits(&hx->gb, ptr, bit_length);
+                hx->intra_gb_ptr        =
+                    hx->inter_gb_ptr    = &hx->gb;
+                hx->data_partitioning = 0;
+
+                if ((err = decode_slice_header(hx, h)))
+                    break;
+
+                if (h->sei_recovery_frame_cnt >= 0 && (h->frame_num != h->sei_recovery_frame_cnt || hx->slice_type_nos != AV_PICTURE_TYPE_I))
+                    h->valid_recovery_point = 1;
+
+                if (   h->sei_recovery_frame_cnt >= 0
+                    && (   h->recovery_frame<0
+                        || ((h->recovery_frame - h->frame_num) & ((1 << h->sps.log2_max_frame_num)-1)) > h->sei_recovery_frame_cnt)) {
+                    h->recovery_frame = (h->frame_num + h->sei_recovery_frame_cnt) %
+                                        (1 << h->sps.log2_max_frame_num);
+
+                    if (!h->valid_recovery_point)
+                        h->recovery_frame = h->frame_num;
+                }
+
+                h->cur_pic_ptr->f.key_frame |=
+                        (hx->nal_unit_type == NAL_IDR_SLICE);
+
+                if (h->recovery_frame == h->frame_num) {
+                    h->cur_pic_ptr->sync |= 1;
+                    h->recovery_frame = -1;
+                }
+
+                h->sync |= !!h->cur_pic_ptr->f.key_frame;
+                h->sync |= 3*!!(avctx->flags2 & CODEC_FLAG2_SHOW_ALL);
+                h->cur_pic_ptr->sync |= h->sync;
+
+                if (h->current_slice == 1) {
+                    if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS))
+                        decode_postinit(h, nal_index >= nals_needed);
+
+                    if (h->avctx->hwaccel &&
+                        h->avctx->hwaccel->start_frame(h->avctx, NULL, 0) < 0)
+                        return -1;
+                    if (CONFIG_H264_VDPAU_DECODER &&
+                        h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
+                        ff_vdpau_h264_picture_start(h);
+                }
+
+                if (hx->redundant_pic_count == 0 &&
+                    (avctx->skip_frame < AVDISCARD_NONREF ||
+                     hx->nal_ref_idc) &&
+                    (avctx->skip_frame < AVDISCARD_BIDIR  ||
+                     hx->slice_type_nos != AV_PICTURE_TYPE_B) &&
+                    (avctx->skip_frame < AVDISCARD_NONKEY ||
+                     hx->slice_type_nos == AV_PICTURE_TYPE_I) &&
+                    avctx->skip_frame < AVDISCARD_ALL) {
+                    if (avctx->hwaccel) {
+                        if (avctx->hwaccel->decode_slice(avctx,
+                                                         &buf[buf_index - consumed],
+                                                         consumed) < 0)
+                            return -1;
+                    } else if (CONFIG_H264_VDPAU_DECODER &&
+                               h->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
+                        static const uint8_t start_code[] = {
+                            0x00, 0x00, 0x01 };
+                        ff_vdpau_add_data_chunk(h->cur_pic_ptr->f.data[0], start_code,
+                                                sizeof(start_code));
+                        ff_vdpau_add_data_chunk(h->cur_pic_ptr->f.data[0], &buf[buf_index - consumed],
+                                                consumed);
+                    } else
+                        context_count++;
+                }
+                break;
+            case NAL_DPA:
+                init_get_bits(&hx->gb, ptr, bit_length);
+                hx->intra_gb_ptr =
+                hx->inter_gb_ptr = NULL;
+
+                if ((err = decode_slice_header(hx, h)) < 0)
+                    break;
+
+                hx->data_partitioning = 1;
+                break;
+            case NAL_DPB:
+                init_get_bits(&hx->intra_gb, ptr, bit_length);
+                hx->intra_gb_ptr = &hx->intra_gb;
+                break;
+            case NAL_DPC:
+                init_get_bits(&hx->inter_gb, ptr, bit_length);
+                hx->inter_gb_ptr = &hx->inter_gb;
+
+                av_log(h->avctx, AV_LOG_ERROR, "Partitioned H.264 support is incomplete\n");
+                break;
+
+                if (hx->redundant_pic_count == 0 &&
+                    hx->intra_gb_ptr &&
+                    hx->data_partitioning &&
+                    h->cur_pic_ptr && h->context_initialized &&
+                    (avctx->skip_frame < AVDISCARD_NONREF || hx->nal_ref_idc) &&
+                    (avctx->skip_frame < AVDISCARD_BIDIR  ||
+                     hx->slice_type_nos != AV_PICTURE_TYPE_B) &&
+                    (avctx->skip_frame < AVDISCARD_NONKEY ||
+                     hx->slice_type_nos == AV_PICTURE_TYPE_I) &&
+                    avctx->skip_frame < AVDISCARD_ALL)
+                    context_count++;
+                break;
+            case NAL_SEI:
+                init_get_bits(&h->gb, ptr, bit_length);
+                ff_h264_decode_sei(h);
+                break;
+            case NAL_SPS:
+                init_get_bits(&h->gb, ptr, bit_length);
+                if (ff_h264_decode_seq_parameter_set(h) < 0 && (h->is_avc ? (nalsize != consumed) && nalsize : 1)) {
+                    av_log(h->avctx, AV_LOG_DEBUG,
+                           "SPS decoding failure, trying again with the complete NAL\n");
+                    if (h->is_avc)
+                        av_assert0(next_avc - buf_index + consumed == nalsize);
+                    if ((next_avc - buf_index + consumed - 1) >= INT_MAX/8)
+                        break;
+                    init_get_bits(&h->gb, &buf[buf_index + 1 - consumed],
+                                  8*(next_avc - buf_index + consumed - 1));
+                    ff_h264_decode_seq_parameter_set(h);
+                }
+
+                break;
+            case NAL_PPS:
+                init_get_bits(&h->gb, ptr, bit_length);
+                ff_h264_decode_picture_parameter_set(h, bit_length);
+                break;
+            case NAL_AUD:
+            case NAL_END_SEQUENCE:
+            case NAL_END_STREAM:
+            case NAL_FILLER_DATA:
+            case NAL_SPS_EXT:
+            case NAL_AUXILIARY_SLICE:
+                break;
+            case NAL_FF_IGNORE:
+                break;
+            default:
+                av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
+                       hx->nal_unit_type, bit_length);
+            }
+
+            if (context_count == h->max_contexts) {
+                execute_decode_slices(h, context_count);
+                context_count = 0;
+            }
+
+            if (err < 0)
+                av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
+            else if (err == 1) {
+                /* Slice could not be decoded in parallel mode, copy down
+                 * NAL unit stuff to context 0 and restart. Note that
+                 * rbsp_buffer is not transferred, but since we no longer
+                 * run in parallel mode this should not be an issue. */
+                h->nal_unit_type = hx->nal_unit_type;
+                h->nal_ref_idc   = hx->nal_ref_idc;
+                hx               = h;
+                goto again;
+            }
+        }
+    }
+    if (context_count)
+        execute_decode_slices(h, context_count);
+
+end:
+    /* clean up */
+    if (h->cur_pic_ptr && !h->droppable) {
+        ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
+                                  h->picture_structure == PICT_BOTTOM_FIELD);
+    }
+
+    return buf_index;
+}
+
+/**
+ * Return the number of bytes consumed for building the current frame.
+ */
+static int get_consumed_bytes(int pos, int buf_size)
+{
+    if (pos == 0)
+        pos = 1;          // avoid infinite loops (i doubt that is needed but ...)
+    if (pos + 10 > buf_size)
+        pos = buf_size;                   // oops ;)
+
+    return pos;
+}
+
+static int output_frame(H264Context *h, AVFrame *dst, Picture *srcp)
+{
+    AVFrame *src = &srcp->f;
+    int i;
+    int ret = av_frame_ref(dst, src);
+    if (ret < 0)
+        return ret;
+
+    if (!srcp->crop)
+        return 0;
+
+    for (i = 0; i < 3; i++) {
+        int hshift = (i > 0) ? h->chroma_x_shift : 0;
+        int vshift = (i > 0) ? h->chroma_y_shift : 0;
+        int off    = ((srcp->crop_left >> hshift) << h->pixel_shift) +
+            (srcp->crop_top  >> vshift) * dst->linesize[i];
+        dst->data[i] += off;
+    }
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+                        int *got_frame, AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    H264Context *h     = avctx->priv_data;
+    AVFrame *pict      = data;
+    int buf_index      = 0;
+    Picture *out;
+    int i, out_idx;
+    int ret;
+
+    h->flags  = avctx->flags;
+
+    /* end of stream, output what is still in the buffers */
+    if (buf_size == 0) {
+ out:
+
+        h->cur_pic_ptr = NULL;
+        h->first_field = 0;
+
+        // FIXME factorize this with the output code below
+        out     = h->delayed_pic[0];
+        out_idx = 0;
+        for (i = 1;
+             h->delayed_pic[i] &&
+             !h->delayed_pic[i]->f.key_frame &&
+             !h->delayed_pic[i]->mmco_reset;
+             i++)
+            if (h->delayed_pic[i]->poc < out->poc) {
+                out     = h->delayed_pic[i];
+                out_idx = i;
+            }
+
+        for (i = out_idx; h->delayed_pic[i]; i++)
+            h->delayed_pic[i] = h->delayed_pic[i + 1];
+
+        if (out) {
+            out->reference &= ~DELAYED_PIC_REF;
+            ret = output_frame(h, pict, out);
+            if (ret < 0)
+                return ret;
+            *got_frame = 1;
+        }
+
+        return buf_index;
+    }
+    if(h->is_avc && buf_size >= 9 && buf[0]==1 && buf[2]==0 && (buf[4]&0xFC)==0xFC && (buf[5]&0x1F) && buf[8]==0x67){
+        int cnt= buf[5]&0x1f;
+        const uint8_t *p= buf+6;
+        while(cnt--){
+            int nalsize= AV_RB16(p) + 2;
+            if(nalsize > buf_size - (p-buf) || p[2]!=0x67)
+                goto not_extra;
+            p += nalsize;
+        }
+        cnt = *(p++);
+        if(!cnt)
+            goto not_extra;
+        while(cnt--){
+            int nalsize= AV_RB16(p) + 2;
+            if(nalsize > buf_size - (p-buf) || p[2]!=0x68)
+                goto not_extra;
+            p += nalsize;
+        }
+
+        return ff_h264_decode_extradata(h, buf, buf_size);
+    }
+not_extra:
+
+    buf_index = decode_nal_units(h, buf, buf_size, 0);
+    if (buf_index < 0)
+        return -1;
+
+    if (!h->cur_pic_ptr && h->nal_unit_type == NAL_END_SEQUENCE) {
+        av_assert0(buf_index <= buf_size);
+        goto out;
+    }
+
+    if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS) && !h->cur_pic_ptr) {
+        if (avctx->skip_frame >= AVDISCARD_NONREF ||
+            buf_size >= 4 && !memcmp("Q264", buf, 4))
+            return buf_size;
+        av_log(avctx, AV_LOG_ERROR, "no frame!\n");
+        return -1;
+    }
+
+    if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS) ||
+        (h->mb_y >= h->mb_height && h->mb_height)) {
+        if (avctx->flags2 & CODEC_FLAG2_CHUNKS)
+            decode_postinit(h, 1);
+
+        field_end(h, 0);
+
+        /* Wait for second field. */
+        *got_frame = 0;
+        if (h->next_output_pic && (h->next_output_pic->sync || h->sync>1)) {
+            ret = output_frame(h, pict, h->next_output_pic);
+            if (ret < 0)
+                return ret;
+            *got_frame = 1;
+            if (CONFIG_MPEGVIDEO) {
+                ff_print_debug_info2(h->avctx, h->next_output_pic, pict, h->er.mbskip_table,
+                                    &h->low_delay,
+                                    h->mb_width, h->mb_height, h->mb_stride, 1);
+            }
+        }
+    }
+
+    assert(pict->data[0] || !*got_frame);
+
+    return get_consumed_bytes(buf_index, buf_size);
+}
+
+av_cold void ff_h264_free_context(H264Context *h)
+{
+    int i;
+
+    free_tables(h, 1); // FIXME cleanup init stuff perhaps
+
+    for (i = 0; i < MAX_SPS_COUNT; i++)
+        av_freep(h->sps_buffers + i);
+
+    for (i = 0; i < MAX_PPS_COUNT; i++)
+        av_freep(h->pps_buffers + i);
+}
+
+static av_cold int h264_decode_end(AVCodecContext *avctx)
+{
+    H264Context *h    = avctx->priv_data;
+
+    ff_h264_remove_all_refs(h);
+    ff_h264_free_context(h);
+
+    unref_picture(h, &h->cur_pic);
+
+    return 0;
+}
+
+static const AVProfile profiles[] = {
+    { FF_PROFILE_H264_BASELINE,             "Baseline"              },
+    { FF_PROFILE_H264_CONSTRAINED_BASELINE, "Constrained Baseline"  },
+    { FF_PROFILE_H264_MAIN,                 "Main"                  },
+    { FF_PROFILE_H264_EXTENDED,             "Extended"              },
+    { FF_PROFILE_H264_HIGH,                 "High"                  },
+    { FF_PROFILE_H264_HIGH_10,              "High 10"               },
+    { FF_PROFILE_H264_HIGH_10_INTRA,        "High 10 Intra"         },
+    { FF_PROFILE_H264_HIGH_422,             "High 4:2:2"            },
+    { FF_PROFILE_H264_HIGH_422_INTRA,       "High 4:2:2 Intra"      },
+    { FF_PROFILE_H264_HIGH_444,             "High 4:4:4"            },
+    { FF_PROFILE_H264_HIGH_444_PREDICTIVE,  "High 4:4:4 Predictive" },
+    { FF_PROFILE_H264_HIGH_444_INTRA,       "High 4:4:4 Intra"      },
+    { FF_PROFILE_H264_CAVLC_444,            "CAVLC 4:4:4"           },
+    { FF_PROFILE_UNKNOWN },
+};
+
+static const AVOption h264_options[] = {
+    {"is_avc", "is avc", offsetof(H264Context, is_avc), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
+    {"nal_length_size", "nal_length_size", offsetof(H264Context, nal_length_size), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0},
+    {NULL}
+};
+
+static const AVClass h264_class = {
+    .class_name = "H264 Decoder",
+    .item_name  = av_default_item_name,
+    .option     = h264_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVClass h264_vdpau_class = {
+    .class_name = "H264 VDPAU Decoder",
+    .item_name  = av_default_item_name,
+    .option     = h264_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_h264_decoder = {
+    .name                  = "h264",
+    .type                  = AVMEDIA_TYPE_VIDEO,
+    .id                    = AV_CODEC_ID_H264,
+    .priv_data_size        = sizeof(H264Context),
+    .init                  = ff_h264_decode_init,
+    .close                 = h264_decode_end,
+    .decode                = decode_frame,
+    .capabilities          = /*CODEC_CAP_DRAW_HORIZ_BAND |*/ CODEC_CAP_DR1 |
+                             CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS |
+                             CODEC_CAP_FRAME_THREADS,
+    .flush                 = flush_dpb,
+    .long_name             = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
+    .init_thread_copy      = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
+    .update_thread_context = ONLY_IF_THREADS_ENABLED(decode_update_thread_context),
+    .profiles              = NULL_IF_CONFIG_SMALL(profiles),
+    .priv_class            = &h264_class,
+};
+
+#if CONFIG_H264_VDPAU_DECODER
+AVCodec ff_h264_vdpau_decoder = {
+    .name           = "h264_vdpau",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_H264,
+    .priv_data_size = sizeof(H264Context),
+    .init           = ff_h264_decode_init,
+    .close          = h264_decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
+    .flush          = flush_dpb,
+    .long_name      = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (VDPAU acceleration)"),
+    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_H264,
+                                                   AV_PIX_FMT_NONE},
+    .profiles       = NULL_IF_CONFIG_SMALL(profiles),
+    .priv_class     = &h264_vdpau_class,
+};
+#endif