diff options
Diffstat (limited to 'chromium/third_party/ffmpeg/libavcodec/atrac3plusdec.c')
| -rw-r--r-- | chromium/third_party/ffmpeg/libavcodec/atrac3plusdec.c | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/chromium/third_party/ffmpeg/libavcodec/atrac3plusdec.c b/chromium/third_party/ffmpeg/libavcodec/atrac3plusdec.c new file mode 100644 index 00000000000..652bd7890da --- /dev/null +++ b/chromium/third_party/ffmpeg/libavcodec/atrac3plusdec.c @@ -0,0 +1,396 @@ +/* + * ATRAC3+ compatible decoder + * + * Copyright (c) 2010-2013 Maxim Poliakovski + * + * 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 + * Sony ATRAC3+ compatible decoder. + * + * Container formats used to store its data: + * RIFF WAV (.at3) and Sony OpenMG (.oma, .aa3). + * + * Technical description of this codec can be found here: + * http://wiki.multimedia.cx/index.php?title=ATRAC3plus + * + * Kudos to Benjamin Larsson and Michael Karcher + * for their precious technical help! + */ + +#include <stdint.h> +#include <string.h> + +#include "libavutil/channel_layout.h" +#include "libavutil/float_dsp.h" +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" +#include "atrac.h" +#include "atrac3plus.h" + +typedef struct ATRAC3PContext { + GetBitContext gb; + AVFloatDSPContext fdsp; + + DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum + DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT + DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation + DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES]; + + AtracGCContext gainc_ctx; ///< gain compensation context + FFTContext mdct_ctx; + FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF + + Atrac3pChanUnitCtx *ch_units; ///< global channel units + + int num_channel_blocks; ///< number of channel blocks + uint8_t channel_blocks[5]; ///< channel configuration descriptor + uint64_t my_channel_layout; ///< current channel layout +} ATRAC3PContext; + +static av_cold int atrac3p_decode_close(AVCodecContext *avctx) +{ + av_free(((ATRAC3PContext *)(avctx->priv_data))->ch_units); + + return 0; +} + +static av_cold int set_channel_params(ATRAC3PContext *ctx, + AVCodecContext *avctx) +{ + memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks)); + + switch (avctx->channels) { + case 1: + if (avctx->channel_layout != AV_CH_FRONT_LEFT) + avctx->channel_layout = AV_CH_LAYOUT_MONO; + + ctx->num_channel_blocks = 1; + ctx->channel_blocks[0] = CH_UNIT_MONO; + break; + case 2: + avctx->channel_layout = AV_CH_LAYOUT_STEREO; + ctx->num_channel_blocks = 1; + ctx->channel_blocks[0] = CH_UNIT_STEREO; + break; + case 3: + avctx->channel_layout = AV_CH_LAYOUT_SURROUND; + ctx->num_channel_blocks = 2; + ctx->channel_blocks[0] = CH_UNIT_STEREO; + ctx->channel_blocks[1] = CH_UNIT_MONO; + break; + case 4: + avctx->channel_layout = AV_CH_LAYOUT_4POINT0; + ctx->num_channel_blocks = 3; + ctx->channel_blocks[0] = CH_UNIT_STEREO; + ctx->channel_blocks[1] = CH_UNIT_MONO; + ctx->channel_blocks[2] = CH_UNIT_MONO; + break; + case 6: + avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK; + ctx->num_channel_blocks = 4; + ctx->channel_blocks[0] = CH_UNIT_STEREO; + ctx->channel_blocks[1] = CH_UNIT_MONO; + ctx->channel_blocks[2] = CH_UNIT_STEREO; + ctx->channel_blocks[3] = CH_UNIT_MONO; + break; + case 7: + avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK; + ctx->num_channel_blocks = 5; + ctx->channel_blocks[0] = CH_UNIT_STEREO; + ctx->channel_blocks[1] = CH_UNIT_MONO; + ctx->channel_blocks[2] = CH_UNIT_STEREO; + ctx->channel_blocks[3] = CH_UNIT_MONO; + ctx->channel_blocks[4] = CH_UNIT_MONO; + break; + case 8: + avctx->channel_layout = AV_CH_LAYOUT_7POINT1; + ctx->num_channel_blocks = 5; + ctx->channel_blocks[0] = CH_UNIT_STEREO; + ctx->channel_blocks[1] = CH_UNIT_MONO; + ctx->channel_blocks[2] = CH_UNIT_STEREO; + ctx->channel_blocks[3] = CH_UNIT_STEREO; + ctx->channel_blocks[4] = CH_UNIT_MONO; + break; + default: + av_log(avctx, AV_LOG_ERROR, + "Unsupported channel count: %d!\n", avctx->channels); + return AVERROR_INVALIDDATA; + } + + return 0; +} + +static av_cold int atrac3p_decode_init(AVCodecContext *avctx) +{ + ATRAC3PContext *ctx = avctx->priv_data; + int i, ch, ret; + + if (!avctx->block_align) { + av_log(avctx, AV_LOG_ERROR, "block_align is not set\n"); + return AVERROR(EINVAL); + } + + ff_atrac3p_init_vlcs(); + + avpriv_float_dsp_init(&ctx->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); + + /* initialize IPQF */ + ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0); + + ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx); + + ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2); + + ff_atrac3p_init_wave_synth(); + + if ((ret = set_channel_params(ctx, avctx)) < 0) + return ret; + + ctx->my_channel_layout = avctx->channel_layout; + + ctx->ch_units = av_mallocz(sizeof(*ctx->ch_units) * + ctx->num_channel_blocks); + if (!ctx->ch_units) { + atrac3p_decode_close(avctx); + return AVERROR(ENOMEM); + } + + for (i = 0; i < ctx->num_channel_blocks; i++) { + for (ch = 0; ch < 2; ch++) { + ctx->ch_units[i].channels[ch].ch_num = ch; + ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0]; + ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0]; + ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0]; + ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0]; + ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0]; + ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0]; + } + + ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0]; + ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1]; + } + + avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; + + return 0; +} + +static void decode_residual_spectrum(Atrac3pChanUnitCtx *ctx, + float out[2][ATRAC3P_FRAME_SAMPLES], + int num_channels, + AVCodecContext *avctx) +{ + int i, sb, ch, qu, nspeclines, RNG_index; + float *dst, q; + int16_t *src; + /* calculate RNG table index for each subband */ + int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 }; + + if (ctx->mute_flag) { + for (ch = 0; ch < num_channels; ch++) + memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch])); + return; + } + + for (qu = 0, RNG_index = 0; qu < ctx->used_quant_units; qu++) + RNG_index += ctx->channels[0].qu_sf_idx[qu] + + ctx->channels[1].qu_sf_idx[qu]; + + for (sb = 0; sb < ctx->num_coded_subbands; sb++, RNG_index += 128) + sb_RNG_index[sb] = RNG_index & 0x3FC; + + /* inverse quant and power compensation */ + for (ch = 0; ch < num_channels; ch++) { + /* clear channel's residual spectrum */ + memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch])); + + for (qu = 0; qu < ctx->used_quant_units; qu++) { + src = &ctx->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]]; + dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]]; + nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] - + ff_atrac3p_qu_to_spec_pos[qu]; + + if (ctx->channels[ch].qu_wordlen[qu] > 0) { + q = ff_atrac3p_sf_tab[ctx->channels[ch].qu_sf_idx[qu]] * + ff_atrac3p_mant_tab[ctx->channels[ch].qu_wordlen[qu]]; + for (i = 0; i < nspeclines; i++) + dst[i] = src[i] * q; + } + } + + for (sb = 0; sb < ctx->num_coded_subbands; sb++) + ff_atrac3p_power_compensation(ctx, ch, &out[ch][0], + sb_RNG_index[sb], sb); + } + + if (ctx->unit_type == CH_UNIT_STEREO) { + for (sb = 0; sb < ctx->num_coded_subbands; sb++) { + if (ctx->swap_channels[sb]) { + for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++) + FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i], + out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]); + } + + /* flip coefficients' sign if requested */ + if (ctx->negate_coeffs[sb]) + for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++) + out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]); + } + } +} + +static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit, + int num_channels, AVCodecContext *avctx) +{ + int ch, sb; + + for (ch = 0; ch < num_channels; ch++) { + for (sb = 0; sb < ch_unit->num_subbands; sb++) { + /* inverse transform and windowing */ + ff_atrac3p_imdct(&ctx->fdsp, &ctx->mdct_ctx, + &ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES], + &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES], + (ch_unit->channels[ch].wnd_shape_prev[sb] << 1) + + ch_unit->channels[ch].wnd_shape[sb], sb); + + /* gain compensation and overlapping */ + ff_atrac_gain_compensation(&ctx->gainc_ctx, + &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES], + &ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES], + &ch_unit->channels[ch].gain_data_prev[sb], + &ch_unit->channels[ch].gain_data[sb], + ATRAC3P_SUBBAND_SAMPLES, + &ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]); + } + + /* zero unused subbands in both output and overlapping buffers */ + memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES], + 0, + (ATRAC3P_SUBBANDS - ch_unit->num_subbands) * + ATRAC3P_SUBBAND_SAMPLES * + sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES])); + memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES], + 0, + (ATRAC3P_SUBBANDS - ch_unit->num_subbands) * + ATRAC3P_SUBBAND_SAMPLES * + sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES])); + + /* resynthesize and add tonal signal */ + if (ch_unit->waves_info->tones_present || + ch_unit->waves_info_prev->tones_present) { + for (sb = 0; sb < ch_unit->num_subbands; sb++) + if (ch_unit->channels[ch].tones_info[sb].num_wavs || + ch_unit->channels[ch].tones_info_prev[sb].num_wavs) { + ff_atrac3p_generate_tones(ch_unit, &ctx->fdsp, ch, sb, + &ctx->time_buf[ch][sb * 128]); + } + } + + /* subband synthesis and acoustic signal output */ + ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch], + &ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]); + } + + /* swap window shape and gain control buffers. */ + for (ch = 0; ch < num_channels; ch++) { + FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape, + ch_unit->channels[ch].wnd_shape_prev); + FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data, + ch_unit->channels[ch].gain_data_prev); + FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info, + ch_unit->channels[ch].tones_info_prev); + } + + FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev); +} + +static int atrac3p_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) +{ + ATRAC3PContext *ctx = avctx->priv_data; + AVFrame *frame = data; + int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process; + float **samples_p = (float **)frame->extended_data; + + frame->nb_samples = ATRAC3P_FRAME_SAMPLES; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; + } + + if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0) + return ret; + + if (get_bits1(&ctx->gb)) { + av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n"); + return AVERROR_INVALIDDATA; + } + + while (get_bits_left(&ctx->gb) >= 2 && + (ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) { + if (ch_unit_id == CH_UNIT_EXTENSION) { + avpriv_report_missing_feature(avctx, "Channel unit extension"); + return AVERROR_PATCHWELCOME; + } + if (ch_block >= ctx->num_channel_blocks || + ctx->channel_blocks[ch_block] != ch_unit_id) { + av_log(avctx, AV_LOG_ERROR, + "Frame data doesn't match channel configuration!\n"); + return AVERROR_INVALIDDATA; + } + + ctx->ch_units[ch_block].unit_type = ch_unit_id; + channels_to_process = ch_unit_id + 1; + + if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb, + &ctx->ch_units[ch_block], + channels_to_process, + avctx)) < 0) + return ret; + + decode_residual_spectrum(&ctx->ch_units[ch_block], ctx->samples, + channels_to_process, avctx); + reconstruct_frame(ctx, &ctx->ch_units[ch_block], + channels_to_process, avctx); + + for (i = 0; i < channels_to_process; i++) + memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i], + ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p)); + + ch_block++; + out_ch_index += channels_to_process; + } + + *got_frame_ptr = 1; + + return avctx->block_align; +} + +AVCodec ff_atrac3p_decoder = { + .name = "atrac3plus", + .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"), + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_ATRAC3P, + .priv_data_size = sizeof(ATRAC3PContext), + .init = atrac3p_decode_init, + .close = atrac3p_decode_close, + .decode = atrac3p_decode_frame, +}; |