diff options
Diffstat (limited to 'src/3rdparty/libwebp/src/mux')
| -rw-r--r-- | src/3rdparty/libwebp/src/mux/muxedit.c | 652 | ||||
| -rw-r--r-- | src/3rdparty/libwebp/src/mux/muxi.h | 230 | ||||
| -rw-r--r-- | src/3rdparty/libwebp/src/mux/muxinternal.c | 551 | ||||
| -rw-r--r-- | src/3rdparty/libwebp/src/mux/muxread.c | 540 |
4 files changed, 1973 insertions, 0 deletions
diff --git a/src/3rdparty/libwebp/src/mux/muxedit.c b/src/3rdparty/libwebp/src/mux/muxedit.c new file mode 100644 index 0000000..25770b3 --- /dev/null +++ b/src/3rdparty/libwebp/src/mux/muxedit.c @@ -0,0 +1,652 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the COPYING file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. +// ----------------------------------------------------------------------------- +// +// Set and delete APIs for mux. +// +// Authors: Urvang (urvang@google.com) +// Vikas (vikasa@google.com) + +#include <assert.h> +#include "./muxi.h" +#include "../utils/utils.h" + +//------------------------------------------------------------------------------ +// Life of a mux object. + +static void MuxInit(WebPMux* const mux) { + if (mux == NULL) return; + memset(mux, 0, sizeof(*mux)); +} + +WebPMux* WebPNewInternal(int version) { + if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_MUX_ABI_VERSION)) { + return NULL; + } else { + WebPMux* const mux = (WebPMux*)malloc(sizeof(WebPMux)); + // If mux is NULL MuxInit is a noop. + MuxInit(mux); + return mux; + } +} + +// Delete all images in 'wpi_list'. +static void DeleteAllImages(WebPMuxImage** const wpi_list) { + while (*wpi_list != NULL) { + *wpi_list = MuxImageDelete(*wpi_list); + } +} + +static void MuxRelease(WebPMux* const mux) { + if (mux == NULL) return; + DeleteAllImages(&mux->images_); + ChunkListDelete(&mux->vp8x_); + ChunkListDelete(&mux->iccp_); + ChunkListDelete(&mux->anim_); + ChunkListDelete(&mux->exif_); + ChunkListDelete(&mux->xmp_); + ChunkListDelete(&mux->unknown_); +} + +void WebPMuxDelete(WebPMux* mux) { + // If mux is NULL MuxRelease is a noop. + MuxRelease(mux); + free(mux); +} + +//------------------------------------------------------------------------------ +// Helper method(s). + +// Handy MACRO, makes MuxSet() very symmetric to MuxGet(). +#define SWITCH_ID_LIST(INDEX, LIST) \ + if (idx == (INDEX)) { \ + err = ChunkAssignData(&chunk, data, copy_data, tag); \ + if (err == WEBP_MUX_OK) { \ + err = ChunkSetNth(&chunk, (LIST), nth); \ + } \ + return err; \ + } + +static WebPMuxError MuxSet(WebPMux* const mux, uint32_t tag, uint32_t nth, + const WebPData* const data, int copy_data) { + WebPChunk chunk; + WebPMuxError err = WEBP_MUX_NOT_FOUND; + const CHUNK_INDEX idx = ChunkGetIndexFromTag(tag); + assert(mux != NULL); + assert(!IsWPI(kChunks[idx].id)); + + ChunkInit(&chunk); + SWITCH_ID_LIST(IDX_VP8X, &mux->vp8x_); + SWITCH_ID_LIST(IDX_ICCP, &mux->iccp_); + SWITCH_ID_LIST(IDX_ANIM, &mux->anim_); + SWITCH_ID_LIST(IDX_EXIF, &mux->exif_); + SWITCH_ID_LIST(IDX_XMP, &mux->xmp_); + SWITCH_ID_LIST(IDX_UNKNOWN, &mux->unknown_); + return err; +} +#undef SWITCH_ID_LIST + +// Create data for frame/fragment given image data, offsets and duration. +static WebPMuxError CreateFrameFragmentData( + int width, int height, const WebPMuxFrameInfo* const info, int is_frame, + WebPData* const frame_frgm) { + uint8_t* frame_frgm_bytes; + const size_t frame_frgm_size = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].size; + + assert(width > 0 && height > 0 && info->duration >= 0); + assert(info->dispose_method == (info->dispose_method & 1)); + // Note: assertion on upper bounds is done in PutLE24(). + + frame_frgm_bytes = (uint8_t*)malloc(frame_frgm_size); + if (frame_frgm_bytes == NULL) return WEBP_MUX_MEMORY_ERROR; + + PutLE24(frame_frgm_bytes + 0, info->x_offset / 2); + PutLE24(frame_frgm_bytes + 3, info->y_offset / 2); + + if (is_frame) { + PutLE24(frame_frgm_bytes + 6, width - 1); + PutLE24(frame_frgm_bytes + 9, height - 1); + PutLE24(frame_frgm_bytes + 12, info->duration); + frame_frgm_bytes[15] = + (info->blend_method == WEBP_MUX_NO_BLEND ? 2 : 0) | + (info->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ? 1 : 0); + } + + frame_frgm->bytes = frame_frgm_bytes; + frame_frgm->size = frame_frgm_size; + return WEBP_MUX_OK; +} + +// Outputs image data given a bitstream. The bitstream can either be a +// single-image WebP file or raw VP8/VP8L data. +// Also outputs 'is_lossless' to be true if the given bitstream is lossless. +static WebPMuxError GetImageData(const WebPData* const bitstream, + WebPData* const image, WebPData* const alpha, + int* const is_lossless) { + WebPDataInit(alpha); // Default: no alpha. + if (bitstream->size < TAG_SIZE || + memcmp(bitstream->bytes, "RIFF", TAG_SIZE)) { + // It is NOT webp file data. Return input data as is. + *image = *bitstream; + } else { + // It is webp file data. Extract image data from it. + const WebPMuxImage* wpi; + WebPMux* const mux = WebPMuxCreate(bitstream, 0); + if (mux == NULL) return WEBP_MUX_BAD_DATA; + wpi = mux->images_; + assert(wpi != NULL && wpi->img_ != NULL); + *image = wpi->img_->data_; + if (wpi->alpha_ != NULL) { + *alpha = wpi->alpha_->data_; + } + WebPMuxDelete(mux); + } + *is_lossless = VP8LCheckSignature(image->bytes, image->size); + return WEBP_MUX_OK; +} + +static WebPMuxError DeleteChunks(WebPChunk** chunk_list, uint32_t tag) { + WebPMuxError err = WEBP_MUX_NOT_FOUND; + assert(chunk_list); + while (*chunk_list) { + WebPChunk* const chunk = *chunk_list; + if (chunk->tag_ == tag) { + *chunk_list = ChunkDelete(chunk); + err = WEBP_MUX_OK; + } else { + chunk_list = &chunk->next_; + } + } + return err; +} + +static WebPMuxError MuxDeleteAllNamedData(WebPMux* const mux, uint32_t tag) { + const WebPChunkId id = ChunkGetIdFromTag(tag); + assert(mux != NULL); + if (IsWPI(id)) return WEBP_MUX_INVALID_ARGUMENT; + return DeleteChunks(MuxGetChunkListFromId(mux, id), tag); +} + +//------------------------------------------------------------------------------ +// Set API(s). + +WebPMuxError WebPMuxSetChunk(WebPMux* mux, const char fourcc[4], + const WebPData* chunk_data, int copy_data) { + uint32_t tag; + WebPMuxError err; + if (mux == NULL || fourcc == NULL || chunk_data == NULL || + chunk_data->bytes == NULL || chunk_data->size > MAX_CHUNK_PAYLOAD) { + return WEBP_MUX_INVALID_ARGUMENT; + } + tag = ChunkGetTagFromFourCC(fourcc); + + // Delete existing chunk(s) with the same 'fourcc'. + err = MuxDeleteAllNamedData(mux, tag); + if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err; + + // Add the given chunk. + return MuxSet(mux, tag, 1, chunk_data, copy_data); +} + +// Creates a chunk from given 'data' and sets it as 1st chunk in 'chunk_list'. +static WebPMuxError AddDataToChunkList( + const WebPData* const data, int copy_data, uint32_t tag, + WebPChunk** chunk_list) { + WebPChunk chunk; + WebPMuxError err; + ChunkInit(&chunk); + err = ChunkAssignData(&chunk, data, copy_data, tag); + if (err != WEBP_MUX_OK) goto Err; + err = ChunkSetNth(&chunk, chunk_list, 1); + if (err != WEBP_MUX_OK) goto Err; + return WEBP_MUX_OK; + Err: + ChunkRelease(&chunk); + return err; +} + +// Extracts image & alpha data from the given bitstream and then sets wpi.alpha_ +// and wpi.img_ appropriately. +static WebPMuxError SetAlphaAndImageChunks( + const WebPData* const bitstream, int copy_data, WebPMuxImage* const wpi) { + int is_lossless = 0; + WebPData image, alpha; + WebPMuxError err = GetImageData(bitstream, &image, &alpha, &is_lossless); + const int image_tag = + is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag; + if (err != WEBP_MUX_OK) return err; + if (alpha.bytes != NULL) { + err = AddDataToChunkList(&alpha, copy_data, kChunks[IDX_ALPHA].tag, + &wpi->alpha_); + if (err != WEBP_MUX_OK) return err; + } + err = AddDataToChunkList(&image, copy_data, image_tag, &wpi->img_); + if (err != WEBP_MUX_OK) return err; + return MuxImageFinalize(wpi) ? WEBP_MUX_OK : WEBP_MUX_INVALID_ARGUMENT; +} + +WebPMuxError WebPMuxSetImage(WebPMux* mux, const WebPData* bitstream, + int copy_data) { + WebPMuxImage wpi; + WebPMuxError err; + + // Sanity checks. + if (mux == NULL || bitstream == NULL || bitstream->bytes == NULL || + bitstream->size > MAX_CHUNK_PAYLOAD) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + if (mux->images_ != NULL) { + // Only one 'simple image' can be added in mux. So, remove present images. + DeleteAllImages(&mux->images_); + } + + MuxImageInit(&wpi); + err = SetAlphaAndImageChunks(bitstream, copy_data, &wpi); + if (err != WEBP_MUX_OK) goto Err; + + // Add this WebPMuxImage to mux. + err = MuxImagePush(&wpi, &mux->images_); + if (err != WEBP_MUX_OK) goto Err; + + // All is well. + return WEBP_MUX_OK; + + Err: // Something bad happened. + MuxImageRelease(&wpi); + return err; +} + +WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* frame, + int copy_data) { + WebPMuxImage wpi; + WebPMuxError err; + int is_frame; + const WebPData* const bitstream = &frame->bitstream; + + // Sanity checks. + if (mux == NULL || frame == NULL) return WEBP_MUX_INVALID_ARGUMENT; + + is_frame = (frame->id == WEBP_CHUNK_ANMF); + if (!(is_frame || (frame->id == WEBP_CHUNK_FRGM))) { + return WEBP_MUX_INVALID_ARGUMENT; + } +#ifndef WEBP_EXPERIMENTAL_FEATURES + if (frame->id == WEBP_CHUNK_FRGM) { // disabled for now. + return WEBP_MUX_INVALID_ARGUMENT; + } +#endif + + if (bitstream->bytes == NULL || bitstream->size > MAX_CHUNK_PAYLOAD) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + if (mux->images_ != NULL) { + const WebPMuxImage* const image = mux->images_; + const uint32_t image_id = (image->header_ != NULL) ? + ChunkGetIdFromTag(image->header_->tag_) : WEBP_CHUNK_IMAGE; + if (image_id != frame->id) { + return WEBP_MUX_INVALID_ARGUMENT; // Conflicting frame types. + } + } + + MuxImageInit(&wpi); + err = SetAlphaAndImageChunks(bitstream, copy_data, &wpi); + if (err != WEBP_MUX_OK) goto Err; + assert(wpi.img_ != NULL); // As SetAlphaAndImageChunks() was successful. + + { + WebPData frame_frgm; + const uint32_t tag = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].tag; + WebPMuxFrameInfo tmp = *frame; + tmp.x_offset &= ~1; // Snap offsets to even. + tmp.y_offset &= ~1; + if (!is_frame) { // Reset unused values. + tmp.duration = 1; + tmp.dispose_method = WEBP_MUX_DISPOSE_NONE; + tmp.blend_method = WEBP_MUX_BLEND; + } + if (tmp.x_offset < 0 || tmp.x_offset >= MAX_POSITION_OFFSET || + tmp.y_offset < 0 || tmp.y_offset >= MAX_POSITION_OFFSET || + (tmp.duration < 0 || tmp.duration >= MAX_DURATION) || + tmp.dispose_method != (tmp.dispose_method & 1)) { + err = WEBP_MUX_INVALID_ARGUMENT; + goto Err; + } + err = CreateFrameFragmentData(wpi.width_, wpi.height_, &tmp, is_frame, + &frame_frgm); + if (err != WEBP_MUX_OK) goto Err; + // Add frame/fragment chunk (with copy_data = 1). + err = AddDataToChunkList(&frame_frgm, 1, tag, &wpi.header_); + WebPDataClear(&frame_frgm); // frame_frgm owned by wpi.header_ now. + if (err != WEBP_MUX_OK) goto Err; + } + + // Add this WebPMuxImage to mux. + err = MuxImagePush(&wpi, &mux->images_); + if (err != WEBP_MUX_OK) goto Err; + + // All is well. + return WEBP_MUX_OK; + + Err: // Something bad happened. + MuxImageRelease(&wpi); + return err; +} + +WebPMuxError WebPMuxSetAnimationParams(WebPMux* mux, + const WebPMuxAnimParams* params) { + WebPMuxError err; + uint8_t data[ANIM_CHUNK_SIZE]; + const WebPData anim = { data, ANIM_CHUNK_SIZE }; + + if (mux == NULL || params == NULL) return WEBP_MUX_INVALID_ARGUMENT; + if (params->loop_count < 0 || params->loop_count >= MAX_LOOP_COUNT) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + // Delete any existing ANIM chunk(s). + err = MuxDeleteAllNamedData(mux, kChunks[IDX_ANIM].tag); + if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err; + + // Set the animation parameters. + PutLE32(data, params->bgcolor); + PutLE16(data + 4, params->loop_count); + return MuxSet(mux, kChunks[IDX_ANIM].tag, 1, &anim, 1); +} + +//------------------------------------------------------------------------------ +// Delete API(s). + +WebPMuxError WebPMuxDeleteChunk(WebPMux* mux, const char fourcc[4]) { + if (mux == NULL || fourcc == NULL) return WEBP_MUX_INVALID_ARGUMENT; + return MuxDeleteAllNamedData(mux, ChunkGetTagFromFourCC(fourcc)); +} + +WebPMuxError WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth) { + if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT; + return MuxImageDeleteNth(&mux->images_, nth); +} + +//------------------------------------------------------------------------------ +// Assembly of the WebP RIFF file. + +static WebPMuxError GetFrameFragmentInfo( + const WebPChunk* const frame_frgm_chunk, + int* const x_offset, int* const y_offset, int* const duration) { + const uint32_t tag = frame_frgm_chunk->tag_; + const int is_frame = (tag == kChunks[IDX_ANMF].tag); + const WebPData* const data = &frame_frgm_chunk->data_; + const size_t expected_data_size = + is_frame ? ANMF_CHUNK_SIZE : FRGM_CHUNK_SIZE; + assert(frame_frgm_chunk != NULL); + assert(tag == kChunks[IDX_ANMF].tag || tag == kChunks[IDX_FRGM].tag); + if (data->size != expected_data_size) return WEBP_MUX_INVALID_ARGUMENT; + + *x_offset = 2 * GetLE24(data->bytes + 0); + *y_offset = 2 * GetLE24(data->bytes + 3); + if (is_frame) *duration = GetLE24(data->bytes + 12); + return WEBP_MUX_OK; +} + +static WebPMuxError GetImageInfo(const WebPMuxImage* const wpi, + int* const x_offset, int* const y_offset, + int* const duration, + int* const width, int* const height) { + const WebPChunk* const frame_frgm_chunk = wpi->header_; + WebPMuxError err; + assert(wpi != NULL); + assert(frame_frgm_chunk != NULL); + + // Get offsets and duration from ANMF/FRGM chunk. + err = GetFrameFragmentInfo(frame_frgm_chunk, x_offset, y_offset, duration); + if (err != WEBP_MUX_OK) return err; + + // Get width and height from VP8/VP8L chunk. + if (width != NULL) *width = wpi->width_; + if (height != NULL) *height = wpi->height_; + return WEBP_MUX_OK; +} + +static WebPMuxError GetImageCanvasWidthHeight( + const WebPMux* const mux, uint32_t flags, + int* const width, int* const height) { + WebPMuxImage* wpi = NULL; + assert(mux != NULL); + assert(width != NULL && height != NULL); + + wpi = mux->images_; + assert(wpi != NULL); + assert(wpi->img_ != NULL); + + if (wpi->next_ != NULL) { + int max_x = 0; + int max_y = 0; + int64_t image_area = 0; + // if we have a chain of wpi's, header_ is necessarily set + assert(wpi->header_ != NULL); + // Aggregate the bounding box for animation frames & fragmented images. + for (; wpi != NULL; wpi = wpi->next_) { + int x_offset = 0, y_offset = 0, duration = 0, w = 0, h = 0; + const WebPMuxError err = GetImageInfo(wpi, &x_offset, &y_offset, + &duration, &w, &h); + const int max_x_pos = x_offset + w; + const int max_y_pos = y_offset + h; + if (err != WEBP_MUX_OK) return err; + assert(x_offset < MAX_POSITION_OFFSET); + assert(y_offset < MAX_POSITION_OFFSET); + + if (max_x_pos > max_x) max_x = max_x_pos; + if (max_y_pos > max_y) max_y = max_y_pos; + image_area += w * h; + } + *width = max_x; + *height = max_y; + // Crude check to validate that there are no image overlaps/holes for + // fragmented images. Check that the aggregated image area for individual + // fragments exactly matches the image area of the constructed canvas. + // However, the area-match is necessary but not sufficient condition. + if ((flags & FRAGMENTS_FLAG) && (image_area != (max_x * max_y))) { + *width = 0; + *height = 0; + return WEBP_MUX_INVALID_ARGUMENT; + } + } else { + // For a single image, canvas dimensions are same as image dimensions. + *width = wpi->width_; + *height = wpi->height_; + } + return WEBP_MUX_OK; +} + +// VP8X format: +// Total Size : 10, +// Flags : 4 bytes, +// Width : 3 bytes, +// Height : 3 bytes. +static WebPMuxError CreateVP8XChunk(WebPMux* const mux) { + WebPMuxError err = WEBP_MUX_OK; + uint32_t flags = 0; + int width = 0; + int height = 0; + uint8_t data[VP8X_CHUNK_SIZE]; + const WebPData vp8x = { data, VP8X_CHUNK_SIZE }; + const WebPMuxImage* images = NULL; + + assert(mux != NULL); + images = mux->images_; // First image. + if (images == NULL || images->img_ == NULL || + images->img_->data_.bytes == NULL) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + // If VP8X chunk(s) is(are) already present, remove them (and later add new + // VP8X chunk with updated flags). + err = MuxDeleteAllNamedData(mux, kChunks[IDX_VP8X].tag); + if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err; + + // Set flags. + if (mux->iccp_ != NULL && mux->iccp_->data_.bytes != NULL) { + flags |= ICCP_FLAG; + } + if (mux->exif_ != NULL && mux->exif_->data_.bytes != NULL) { + flags |= EXIF_FLAG; + } + if (mux->xmp_ != NULL && mux->xmp_->data_.bytes != NULL) { + flags |= XMP_FLAG; + } + if (images->header_ != NULL) { + if (images->header_->tag_ == kChunks[IDX_FRGM].tag) { + // This is a fragmented image. + flags |= FRAGMENTS_FLAG; + } else if (images->header_->tag_ == kChunks[IDX_ANMF].tag) { + // This is an image with animation. + flags |= ANIMATION_FLAG; + } + } + if (MuxImageCount(images, WEBP_CHUNK_ALPHA) > 0) { + flags |= ALPHA_FLAG; // Some images have an alpha channel. + } + + if (flags == 0) { + // For Simple Image, VP8X chunk should not be added. + return WEBP_MUX_OK; + } + + err = GetImageCanvasWidthHeight(mux, flags, &width, &height); + if (err != WEBP_MUX_OK) return err; + + if (width <= 0 || height <= 0) { + return WEBP_MUX_INVALID_ARGUMENT; + } + if (width > MAX_CANVAS_SIZE || height > MAX_CANVAS_SIZE) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + if (MuxHasAlpha(images)) { + // This means some frames explicitly/implicitly contain alpha. + // Note: This 'flags' update must NOT be done for a lossless image + // without a VP8X chunk! + flags |= ALPHA_FLAG; + } + + PutLE32(data + 0, flags); // VP8X chunk flags. + PutLE24(data + 4, width - 1); // canvas width. + PutLE24(data + 7, height - 1); // canvas height. + + return MuxSet(mux, kChunks[IDX_VP8X].tag, 1, &vp8x, 1); +} + +// Cleans up 'mux' by removing any unnecessary chunks. +static WebPMuxError MuxCleanup(WebPMux* const mux) { + int num_frames; + int num_fragments; + int num_anim_chunks; + + // If we have an image with single fragment or frame, convert it to a + // non-animated non-fragmented image (to avoid writing FRGM/ANMF chunk + // unnecessarily). + WebPMuxError err = WebPMuxNumChunks(mux, kChunks[IDX_ANMF].id, &num_frames); + if (err != WEBP_MUX_OK) return err; + err = WebPMuxNumChunks(mux, kChunks[IDX_FRGM].id, &num_fragments); + if (err != WEBP_MUX_OK) return err; + if (num_frames == 1 || num_fragments == 1) { + WebPMuxImage* frame_frag; + err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, &frame_frag); + assert(err == WEBP_MUX_OK); // We know that one frame/fragment does exist. + if (frame_frag->header_ != NULL) { + assert(frame_frag->header_->tag_ == kChunks[IDX_ANMF].tag || + frame_frag->header_->tag_ == kChunks[IDX_FRGM].tag); + ChunkDelete(frame_frag->header_); // Removes ANMF/FRGM chunk. + frame_frag->header_ = NULL; + } + num_frames = 0; + num_fragments = 0; + } + // Remove ANIM chunk if this is a non-animated image. + err = WebPMuxNumChunks(mux, kChunks[IDX_ANIM].id, &num_anim_chunks); + if (err != WEBP_MUX_OK) return err; + if (num_anim_chunks >= 1 && num_frames == 0) { + err = MuxDeleteAllNamedData(mux, kChunks[IDX_ANIM].tag); + if (err != WEBP_MUX_OK) return err; + } + return WEBP_MUX_OK; +} + +// Total size of a list of images. +static size_t ImageListDiskSize(const WebPMuxImage* wpi_list) { + size_t size = 0; + while (wpi_list != NULL) { + size += MuxImageDiskSize(wpi_list); + wpi_list = wpi_list->next_; + } + return size; +} + +// Write out the given list of images into 'dst'. +static uint8_t* ImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst) { + while (wpi_list != NULL) { + dst = MuxImageEmit(wpi_list, dst); + wpi_list = wpi_list->next_; + } + return dst; +} + +WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) { + size_t size = 0; + uint8_t* data = NULL; + uint8_t* dst = NULL; + WebPMuxError err; + + if (mux == NULL || assembled_data == NULL) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + // Finalize mux. + err = MuxCleanup(mux); + if (err != WEBP_MUX_OK) return err; + err = CreateVP8XChunk(mux); + if (err != WEBP_MUX_OK) return err; + + // Allocate data. + size = ChunkListDiskSize(mux->vp8x_) + ChunkListDiskSize(mux->iccp_) + + ChunkListDiskSize(mux->anim_) + ImageListDiskSize(mux->images_) + + ChunkListDiskSize(mux->exif_) + ChunkListDiskSize(mux->xmp_) + + ChunkListDiskSize(mux->unknown_) + RIFF_HEADER_SIZE; + + data = (uint8_t*)malloc(size); + if (data == NULL) return WEBP_MUX_MEMORY_ERROR; + + // Emit header & chunks. + dst = MuxEmitRiffHeader(data, size); + dst = ChunkListEmit(mux->vp8x_, dst); + dst = ChunkListEmit(mux->iccp_, dst); + dst = ChunkListEmit(mux->anim_, dst); + dst = ImageListEmit(mux->images_, dst); + dst = ChunkListEmit(mux->exif_, dst); + dst = ChunkListEmit(mux->xmp_, dst); + dst = ChunkListEmit(mux->unknown_, dst); + assert(dst == data + size); + + // Validate mux. + err = MuxValidate(mux); + if (err != WEBP_MUX_OK) { + free(data); + data = NULL; + size = 0; + } + + // Finalize data. + assembled_data->bytes = data; + assembled_data->size = size; + + return err; +} + +//------------------------------------------------------------------------------ + diff --git a/src/3rdparty/libwebp/src/mux/muxi.h b/src/3rdparty/libwebp/src/mux/muxi.h new file mode 100644 index 0000000..277d5fb --- /dev/null +++ b/src/3rdparty/libwebp/src/mux/muxi.h @@ -0,0 +1,230 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the COPYING file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. +// ----------------------------------------------------------------------------- +// +// Internal header for mux library. +// +// Author: Urvang (urvang@google.com) + +#ifndef WEBP_MUX_MUXI_H_ +#define WEBP_MUX_MUXI_H_ + +#include <stdlib.h> +#include "../dec/vp8i.h" +#include "../dec/vp8li.h" +#include "../webp/mux.h" + +#ifdef __cplusplus +extern "C" { +#endif + +//------------------------------------------------------------------------------ +// Defines and constants. + +#define MUX_MAJ_VERSION 0 +#define MUX_MIN_VERSION 2 +#define MUX_REV_VERSION 0 + +// Chunk object. +typedef struct WebPChunk WebPChunk; +struct WebPChunk { + uint32_t tag_; + int owner_; // True if *data_ memory is owned internally. + // VP8X, ANIM, and other internally created chunks + // like ANMF/FRGM are always owned. + WebPData data_; + WebPChunk* next_; +}; + +// MuxImage object. Store a full WebP image (including ANMF/FRGM chunk, ALPH +// chunk and VP8/VP8L chunk), +typedef struct WebPMuxImage WebPMuxImage; +struct WebPMuxImage { + WebPChunk* header_; // Corresponds to WEBP_CHUNK_ANMF/WEBP_CHUNK_FRGM. + WebPChunk* alpha_; // Corresponds to WEBP_CHUNK_ALPHA. + WebPChunk* img_; // Corresponds to WEBP_CHUNK_IMAGE. + WebPChunk* unknown_; // Corresponds to WEBP_CHUNK_UNKNOWN. + int width_; + int height_; + int has_alpha_; // Through ALPH chunk or as part of VP8L. + int is_partial_; // True if only some of the chunks are filled. + WebPMuxImage* next_; +}; + +// Main mux object. Stores data chunks. +struct WebPMux { + WebPMuxImage* images_; + WebPChunk* iccp_; + WebPChunk* exif_; + WebPChunk* xmp_; + WebPChunk* anim_; + WebPChunk* vp8x_; + + WebPChunk* unknown_; +}; + +// CHUNK_INDEX enum: used for indexing within 'kChunks' (defined below) only. +// Note: the reason for having two enums ('WebPChunkId' and 'CHUNK_INDEX') is to +// allow two different chunks to have the same id (e.g. WebPChunkId +// 'WEBP_CHUNK_IMAGE' can correspond to CHUNK_INDEX 'IDX_VP8' or 'IDX_VP8L'). +typedef enum { + IDX_VP8X = 0, + IDX_ICCP, + IDX_ANIM, + IDX_ANMF, + IDX_FRGM, + IDX_ALPHA, + IDX_VP8, + IDX_VP8L, + IDX_EXIF, + IDX_XMP, + IDX_UNKNOWN, + + IDX_NIL, + IDX_LAST_CHUNK +} CHUNK_INDEX; + +#define NIL_TAG 0x00000000u // To signal void chunk. + +typedef struct { + uint32_t tag; + WebPChunkId id; + uint32_t size; +} ChunkInfo; + +extern const ChunkInfo kChunks[IDX_LAST_CHUNK]; + +//------------------------------------------------------------------------------ +// Chunk object management. + +// Initialize. +void ChunkInit(WebPChunk* const chunk); + +// Get chunk index from chunk tag. Returns IDX_UNKNOWN if not found. +CHUNK_INDEX ChunkGetIndexFromTag(uint32_t tag); + +// Get chunk id from chunk tag. Returns WEBP_CHUNK_UNKNOWN if not found. +WebPChunkId ChunkGetIdFromTag(uint32_t tag); + +// Convert a fourcc string to a tag. +uint32_t ChunkGetTagFromFourCC(const char fourcc[4]); + +// Get chunk index from fourcc. Returns IDX_UNKNOWN if given fourcc is unknown. +CHUNK_INDEX ChunkGetIndexFromFourCC(const char fourcc[4]); + +// Search for nth chunk with given 'tag' in the chunk list. +// nth = 0 means "last of the list". +WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag); + +// Fill the chunk with the given data. +WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data, + int copy_data, uint32_t tag); + +// Sets 'chunk' at nth position in the 'chunk_list'. +// nth = 0 has the special meaning "last of the list". +// On success ownership is transferred from 'chunk' to the 'chunk_list'. +WebPMuxError ChunkSetNth(WebPChunk* chunk, WebPChunk** chunk_list, + uint32_t nth); + +// Releases chunk and returns chunk->next_. +WebPChunk* ChunkRelease(WebPChunk* const chunk); + +// Deletes given chunk & returns chunk->next_. +WebPChunk* ChunkDelete(WebPChunk* const chunk); + +// Deletes all chunks in the given chunk list. +void ChunkListDelete(WebPChunk** const chunk_list); + +// Returns size of the chunk including chunk header and padding byte (if any). +static WEBP_INLINE size_t SizeWithPadding(size_t chunk_size) { + return CHUNK_HEADER_SIZE + ((chunk_size + 1) & ~1U); +} + +// Size of a chunk including header and padding. +static WEBP_INLINE size_t ChunkDiskSize(const WebPChunk* chunk) { + const size_t data_size = chunk->data_.size; + assert(data_size < MAX_CHUNK_PAYLOAD); + return SizeWithPadding(data_size); +} + +// Total size of a list of chunks. +size_t ChunkListDiskSize(const WebPChunk* chunk_list); + +// Write out the given list of chunks into 'dst'. +uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst); + +//------------------------------------------------------------------------------ +// MuxImage object management. + +// Initialize. +void MuxImageInit(WebPMuxImage* const wpi); + +// Releases image 'wpi' and returns wpi->next. +WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi); + +// Delete image 'wpi' and return the next image in the list or NULL. +// 'wpi' can be NULL. +WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi); + +// Count number of images matching the given tag id in the 'wpi_list'. +// If id == WEBP_CHUNK_NIL, all images will be matched. +int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id); + +// Update width/height/has_alpha info from chunks within wpi. +// Also remove ALPH chunk if not needed. +int MuxImageFinalize(WebPMuxImage* const wpi); + +// Check if given ID corresponds to an image related chunk. +static WEBP_INLINE int IsWPI(WebPChunkId id) { + switch (id) { + case WEBP_CHUNK_ANMF: + case WEBP_CHUNK_FRGM: + case WEBP_CHUNK_ALPHA: + case WEBP_CHUNK_IMAGE: return 1; + default: return 0; + } +} + +// Pushes 'wpi' at the end of 'wpi_list'. +WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list); + +// Delete nth image in the image list. +WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth); + +// Get nth image in the image list. +WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth, + WebPMuxImage** wpi); + +// Total size of the given image. +size_t MuxImageDiskSize(const WebPMuxImage* const wpi); + +// Write out the given image into 'dst'. +uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst); + +//------------------------------------------------------------------------------ +// Helper methods for mux. + +// Checks if the given image list contains at least one image with alpha. +int MuxHasAlpha(const WebPMuxImage* images); + +// Write out RIFF header into 'data', given total data size 'size'. +uint8_t* MuxEmitRiffHeader(uint8_t* const data, size_t size); + +// Returns the list where chunk with given ID is to be inserted in mux. +WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id); + +// Validates the given mux object. +WebPMuxError MuxValidate(const WebPMux* const mux); + +//------------------------------------------------------------------------------ + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif /* WEBP_MUX_MUXI_H_ */ diff --git a/src/3rdparty/libwebp/src/mux/muxinternal.c b/src/3rdparty/libwebp/src/mux/muxinternal.c new file mode 100644 index 0000000..3f992ce --- /dev/null +++ b/src/3rdparty/libwebp/src/mux/muxinternal.c @@ -0,0 +1,551 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the COPYING file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. +// ----------------------------------------------------------------------------- +// +// Internal objects and utils for mux. +// +// Authors: Urvang (urvang@google.com) +// Vikas (vikasa@google.com) + +#include <assert.h> +#include "./muxi.h" +#include "../utils/utils.h" + +#define UNDEFINED_CHUNK_SIZE (-1) + +const ChunkInfo kChunks[] = { + { MKFOURCC('V', 'P', '8', 'X'), WEBP_CHUNK_VP8X, VP8X_CHUNK_SIZE }, + { MKFOURCC('I', 'C', 'C', 'P'), WEBP_CHUNK_ICCP, UNDEFINED_CHUNK_SIZE }, + { MKFOURCC('A', 'N', 'I', 'M'), WEBP_CHUNK_ANIM, ANIM_CHUNK_SIZE }, + { MKFOURCC('A', 'N', 'M', 'F'), WEBP_CHUNK_ANMF, ANMF_CHUNK_SIZE }, + { MKFOURCC('F', 'R', 'G', 'M'), WEBP_CHUNK_FRGM, FRGM_CHUNK_SIZE }, + { MKFOURCC('A', 'L', 'P', 'H'), WEBP_CHUNK_ALPHA, UNDEFINED_CHUNK_SIZE }, + { MKFOURCC('V', 'P', '8', ' '), WEBP_CHUNK_IMAGE, UNDEFINED_CHUNK_SIZE }, + { MKFOURCC('V', 'P', '8', 'L'), WEBP_CHUNK_IMAGE, UNDEFINED_CHUNK_SIZE }, + { MKFOURCC('E', 'X', 'I', 'F'), WEBP_CHUNK_EXIF, UNDEFINED_CHUNK_SIZE }, + { MKFOURCC('X', 'M', 'P', ' '), WEBP_CHUNK_XMP, UNDEFINED_CHUNK_SIZE }, + { NIL_TAG, WEBP_CHUNK_UNKNOWN, UNDEFINED_CHUNK_SIZE }, + + { NIL_TAG, WEBP_CHUNK_NIL, UNDEFINED_CHUNK_SIZE } +}; + +//------------------------------------------------------------------------------ + +int WebPGetMuxVersion(void) { + return (MUX_MAJ_VERSION << 16) | (MUX_MIN_VERSION << 8) | MUX_REV_VERSION; +} + +//------------------------------------------------------------------------------ +// Life of a chunk object. + +void ChunkInit(WebPChunk* const chunk) { + assert(chunk); + memset(chunk, 0, sizeof(*chunk)); + chunk->tag_ = NIL_TAG; +} + +WebPChunk* ChunkRelease(WebPChunk* const chunk) { + WebPChunk* next; + if (chunk == NULL) return NULL; + if (chunk->owner_) { + WebPDataClear(&chunk->data_); + } + next = chunk->next_; + ChunkInit(chunk); + return next; +} + +//------------------------------------------------------------------------------ +// Chunk misc methods. + +CHUNK_INDEX ChunkGetIndexFromTag(uint32_t tag) { + int i; + for (i = 0; kChunks[i].tag != NIL_TAG; ++i) { + if (tag == kChunks[i].tag) return (CHUNK_INDEX)i; + } + return IDX_UNKNOWN; +} + +WebPChunkId ChunkGetIdFromTag(uint32_t tag) { + int i; + for (i = 0; kChunks[i].tag != NIL_TAG; ++i) { + if (tag == kChunks[i].tag) return kChunks[i].id; + } + return WEBP_CHUNK_UNKNOWN; +} + +uint32_t ChunkGetTagFromFourCC(const char fourcc[4]) { + return MKFOURCC(fourcc[0], fourcc[1], fourcc[2], fourcc[3]); +} + +CHUNK_INDEX ChunkGetIndexFromFourCC(const char fourcc[4]) { + const uint32_t tag = ChunkGetTagFromFourCC(fourcc); + return ChunkGetIndexFromTag(tag); +} + +//------------------------------------------------------------------------------ +// Chunk search methods. + +// Returns next chunk in the chunk list with the given tag. +static WebPChunk* ChunkSearchNextInList(WebPChunk* chunk, uint32_t tag) { + while (chunk != NULL && chunk->tag_ != tag) { + chunk = chunk->next_; + } + return chunk; +} + +WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag) { + uint32_t iter = nth; + first = ChunkSearchNextInList(first, tag); + if (first == NULL) return NULL; + + while (--iter != 0) { + WebPChunk* next_chunk = ChunkSearchNextInList(first->next_, tag); + if (next_chunk == NULL) break; + first = next_chunk; + } + return ((nth > 0) && (iter > 0)) ? NULL : first; +} + +// Outputs a pointer to 'prev_chunk->next_', +// where 'prev_chunk' is the pointer to the chunk at position (nth - 1). +// Returns true if nth chunk was found. +static int ChunkSearchListToSet(WebPChunk** chunk_list, uint32_t nth, + WebPChunk*** const location) { + uint32_t count = 0; + assert(chunk_list != NULL); + *location = chunk_list; + + while (*chunk_list != NULL) { + WebPChunk* const cur_chunk = *chunk_list; + ++count; + if (count == nth) return 1; // Found. + chunk_list = &cur_chunk->next_; + *location = chunk_list; + } + + // *chunk_list is ok to be NULL if adding at last location. + return (nth == 0 || (count == nth - 1)) ? 1 : 0; +} + +//------------------------------------------------------------------------------ +// Chunk writer methods. + +WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data, + int copy_data, uint32_t tag) { + // For internally allocated chunks, always copy data & make it owner of data. + if (tag == kChunks[IDX_VP8X].tag || tag == kChunks[IDX_ANIM].tag) { + copy_data = 1; + } + + ChunkRelease(chunk); + + if (data != NULL) { + if (copy_data) { // Copy data. + if (!WebPDataCopy(data, &chunk->data_)) return WEBP_MUX_MEMORY_ERROR; + chunk->owner_ = 1; // Chunk is owner of data. + } else { // Don't copy data. + chunk->data_ = *data; + } + } + chunk->tag_ = tag; + return WEBP_MUX_OK; +} + +WebPMuxError ChunkSetNth(WebPChunk* chunk, WebPChunk** chunk_list, + uint32_t nth) { + WebPChunk* new_chunk; + + if (!ChunkSearchListToSet(chunk_list, nth, &chunk_list)) { + return WEBP_MUX_NOT_FOUND; + } + + new_chunk = (WebPChunk*)malloc(sizeof(*new_chunk)); + if (new_chunk == NULL) return WEBP_MUX_MEMORY_ERROR; + *new_chunk = *chunk; + chunk->owner_ = 0; + new_chunk->next_ = *chunk_list; + *chunk_list = new_chunk; + return WEBP_MUX_OK; +} + +//------------------------------------------------------------------------------ +// Chunk deletion method(s). + +WebPChunk* ChunkDelete(WebPChunk* const chunk) { + WebPChunk* const next = ChunkRelease(chunk); + free(chunk); + return next; +} + +void ChunkListDelete(WebPChunk** const chunk_list) { + while (*chunk_list != NULL) { + *chunk_list = ChunkDelete(*chunk_list); + } +} + +//------------------------------------------------------------------------------ +// Chunk serialization methods. + +static uint8_t* ChunkEmit(const WebPChunk* const chunk, uint8_t* dst) { + const size_t chunk_size = chunk->data_.size; + assert(chunk); + assert(chunk->tag_ != NIL_TAG); + PutLE32(dst + 0, chunk->tag_); + PutLE32(dst + TAG_SIZE, (uint32_t)chunk_size); + assert(chunk_size == (uint32_t)chunk_size); + memcpy(dst + CHUNK_HEADER_SIZE, chunk->data_.bytes, chunk_size); + if (chunk_size & 1) + dst[CHUNK_HEADER_SIZE + chunk_size] = 0; // Add padding. + return dst + ChunkDiskSize(chunk); +} + +uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst) { + while (chunk_list != NULL) { + dst = ChunkEmit(chunk_list, dst); + chunk_list = chunk_list->next_; + } + return dst; +} + +size_t ChunkListDiskSize(const WebPChunk* chunk_list) { + size_t size = 0; + while (chunk_list != NULL) { + size += ChunkDiskSize(chunk_list); + chunk_list = chunk_list->next_; + } + return size; +} + +//------------------------------------------------------------------------------ +// Life of a MuxImage object. + +void MuxImageInit(WebPMuxImage* const wpi) { + assert(wpi); + memset(wpi, 0, sizeof(*wpi)); +} + +WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi) { + WebPMuxImage* next; + if (wpi == NULL) return NULL; + ChunkDelete(wpi->header_); + ChunkDelete(wpi->alpha_); + ChunkDelete(wpi->img_); + ChunkListDelete(&wpi->unknown_); + + next = wpi->next_; + MuxImageInit(wpi); + return next; +} + +//------------------------------------------------------------------------------ +// MuxImage search methods. + +// Get a reference to appropriate chunk list within an image given chunk tag. +static WebPChunk** GetChunkListFromId(const WebPMuxImage* const wpi, + WebPChunkId id) { + assert(wpi != NULL); + switch (id) { + case WEBP_CHUNK_ANMF: + case WEBP_CHUNK_FRGM: return (WebPChunk**)&wpi->header_; + case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_; + case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_; + default: return NULL; + } +} + +int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) { + int count = 0; + const WebPMuxImage* current; + for (current = wpi_list; current != NULL; current = current->next_) { + if (id == WEBP_CHUNK_NIL) { + ++count; // Special case: count all images. + } else { + const WebPChunk* const wpi_chunk = *GetChunkListFromId(current, id); + if (wpi_chunk != NULL) { + const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_); + if (wpi_chunk_id == id) ++count; // Count images with a matching 'id'. + } + } + } + return count; +} + +// Outputs a pointer to 'prev_wpi->next_', +// where 'prev_wpi' is the pointer to the image at position (nth - 1). +// Returns true if nth image was found. +static int SearchImageToGetOrDelete(WebPMuxImage** wpi_list, uint32_t nth, + WebPMuxImage*** const location) { + uint32_t count = 0; + assert(wpi_list); + *location = wpi_list; + + if (nth == 0) { + nth = MuxImageCount(*wpi_list, WEBP_CHUNK_NIL); + if (nth == 0) return 0; // Not found. + } + + while (*wpi_list != NULL) { + WebPMuxImage* const cur_wpi = *wpi_list; + ++count; + if (count == nth) return 1; // Found. + wpi_list = &cur_wpi->next_; + *location = wpi_list; + } + return 0; // Not found. +} + +//------------------------------------------------------------------------------ +// MuxImage writer methods. + +WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list) { + WebPMuxImage* new_wpi; + + while (*wpi_list != NULL) { + WebPMuxImage* const cur_wpi = *wpi_list; + if (cur_wpi->next_ == NULL) break; + wpi_list = &cur_wpi->next_; + } + + new_wpi = (WebPMuxImage*)malloc(sizeof(*new_wpi)); + if (new_wpi == NULL) return WEBP_MUX_MEMORY_ERROR; + *new_wpi = *wpi; + new_wpi->next_ = NULL; + + if (*wpi_list != NULL) { + (*wpi_list)->next_ = new_wpi; + } else { + *wpi_list = new_wpi; + } + return WEBP_MUX_OK; +} + +//------------------------------------------------------------------------------ +// MuxImage deletion methods. + +WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi) { + // Delete the components of wpi. If wpi is NULL this is a noop. + WebPMuxImage* const next = MuxImageRelease(wpi); + free(wpi); + return next; +} + +WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth) { + assert(wpi_list); + if (!SearchImageToGetOrDelete(wpi_list, nth, &wpi_list)) { + return WEBP_MUX_NOT_FOUND; + } + *wpi_list = MuxImageDelete(*wpi_list); + return WEBP_MUX_OK; +} + +//------------------------------------------------------------------------------ +// MuxImage reader methods. + +WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth, + WebPMuxImage** wpi) { + assert(wpi_list); + assert(wpi); + if (!SearchImageToGetOrDelete((WebPMuxImage**)wpi_list, nth, + (WebPMuxImage***)&wpi_list)) { + return WEBP_MUX_NOT_FOUND; + } + *wpi = (WebPMuxImage*)*wpi_list; + return WEBP_MUX_OK; +} + +//------------------------------------------------------------------------------ +// MuxImage serialization methods. + +// Size of an image. +size_t MuxImageDiskSize(const WebPMuxImage* const wpi) { + size_t size = 0; + if (wpi->header_ != NULL) size += ChunkDiskSize(wpi->header_); + if (wpi->alpha_ != NULL) size += ChunkDiskSize(wpi->alpha_); + if (wpi->img_ != NULL) size += ChunkDiskSize(wpi->img_); + if (wpi->unknown_ != NULL) size += ChunkListDiskSize(wpi->unknown_); + return size; +} + +// Special case as ANMF/FRGM chunk encapsulates other image chunks. +static uint8_t* ChunkEmitSpecial(const WebPChunk* const header, + size_t total_size, uint8_t* dst) { + const size_t header_size = header->data_.size; + const size_t offset_to_next = total_size - CHUNK_HEADER_SIZE; + assert(header->tag_ == kChunks[IDX_ANMF].tag || + header->tag_ == kChunks[IDX_FRGM].tag); + PutLE32(dst + 0, header->tag_); + PutLE32(dst + TAG_SIZE, (uint32_t)offset_to_next); + assert(header_size == (uint32_t)header_size); + memcpy(dst + CHUNK_HEADER_SIZE, header->data_.bytes, header_size); + if (header_size & 1) { + dst[CHUNK_HEADER_SIZE + header_size] = 0; // Add padding. + } + return dst + ChunkDiskSize(header); +} + +uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst) { + // Ordering of chunks to be emitted is strictly as follows: + // 1. ANMF/FRGM chunk (if present). + // 2. ALPH chunk (if present). + // 3. VP8/VP8L chunk. + assert(wpi); + if (wpi->header_ != NULL) { + dst = ChunkEmitSpecial(wpi->header_, MuxImageDiskSize(wpi), dst); + } + if (wpi->alpha_ != NULL) dst = ChunkEmit(wpi->alpha_, dst); + if (wpi->img_ != NULL) dst = ChunkEmit(wpi->img_, dst); + if (wpi->unknown_ != NULL) dst = ChunkListEmit(wpi->unknown_, dst); + return dst; +} + +//------------------------------------------------------------------------------ +// Helper methods for mux. + +int MuxHasAlpha(const WebPMuxImage* images) { + while (images != NULL) { + if (images->has_alpha_) return 1; + images = images->next_; + } + return 0; +} + +uint8_t* MuxEmitRiffHeader(uint8_t* const data, size_t size) { + PutLE32(data + 0, MKFOURCC('R', 'I', 'F', 'F')); + PutLE32(data + TAG_SIZE, (uint32_t)size - CHUNK_HEADER_SIZE); + assert(size == (uint32_t)size); + PutLE32(data + TAG_SIZE + CHUNK_SIZE_BYTES, MKFOURCC('W', 'E', 'B', 'P')); + return data + RIFF_HEADER_SIZE; +} + +WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, WebPChunkId id) { + assert(mux != NULL); + switch (id) { + case WEBP_CHUNK_VP8X: return (WebPChunk**)&mux->vp8x_; + case WEBP_CHUNK_ICCP: return (WebPChunk**)&mux->iccp_; + case WEBP_CHUNK_ANIM: return (WebPChunk**)&mux->anim_; + case WEBP_CHUNK_EXIF: return (WebPChunk**)&mux->exif_; + case WEBP_CHUNK_XMP: return (WebPChunk**)&mux->xmp_; + default: return (WebPChunk**)&mux->unknown_; + } +} + +static int IsNotCompatible(int feature, int num_items) { + return (feature != 0) != (num_items > 0); +} + +#define NO_FLAG 0 + +// Test basic constraints: +// retrieval, maximum number of chunks by index (use -1 to skip) +// and feature incompatibility (use NO_FLAG to skip). +// On success returns WEBP_MUX_OK and stores the chunk count in *num. +static WebPMuxError ValidateChunk(const WebPMux* const mux, CHUNK_INDEX idx, + WebPFeatureFlags feature, + uint32_t vp8x_flags, + int max, int* num) { + const WebPMuxError err = + WebPMuxNumChunks(mux, kChunks[idx].id, num); + if (err != WEBP_MUX_OK) return err; + if (max > -1 && *num > max) return WEBP_MUX_INVALID_ARGUMENT; + if (feature != NO_FLAG && IsNotCompatible(vp8x_flags & feature, *num)) { + return WEBP_MUX_INVALID_ARGUMENT; + } + return WEBP_MUX_OK; +} + +WebPMuxError MuxValidate(const WebPMux* const mux) { + int num_iccp; + int num_exif; + int num_xmp; + int num_anim; + int num_frames; + int num_fragments; + int num_vp8x; + int num_images; + int num_alpha; + uint32_t flags; + WebPMuxError err; + + // Verify mux is not NULL. + if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT; + + // Verify mux has at least one image. + if (mux->images_ == NULL) return WEBP_MUX_INVALID_ARGUMENT; + + err = WebPMuxGetFeatures(mux, &flags); + if (err != WEBP_MUX_OK) return err; + + // At most one color profile chunk. + err = ValidateChunk(mux, IDX_ICCP, ICCP_FLAG, flags, 1, &num_iccp); + if (err != WEBP_MUX_OK) return err; + + // At most one EXIF metadata. + err = ValidateChunk(mux, IDX_EXIF, EXIF_FLAG, flags, 1, &num_exif); + if (err != WEBP_MUX_OK) return err; + + // At most one XMP metadata. + err = ValidateChunk(mux, IDX_XMP, XMP_FLAG, flags, 1, &num_xmp); + if (err != WEBP_MUX_OK) return err; + + // Animation: ANIMATION_FLAG, ANIM chunk and ANMF chunk(s) are consistent. + // At most one ANIM chunk. + err = ValidateChunk(mux, IDX_ANIM, NO_FLAG, flags, 1, &num_anim); + if (err != WEBP_MUX_OK) return err; + err = ValidateChunk(mux, IDX_ANMF, NO_FLAG, flags, -1, &num_frames); + if (err != WEBP_MUX_OK) return err; + + { + const int has_animation = !!(flags & ANIMATION_FLAG); + if (has_animation && (num_anim == 0 || num_frames == 0)) { + return WEBP_MUX_INVALID_ARGUMENT; + } + if (!has_animation && (num_anim == 1 || num_frames > 0)) { + return WEBP_MUX_INVALID_ARGUMENT; + } + } + + // Fragmentation: FRAGMENTS_FLAG and FRGM chunk(s) are consistent. + err = ValidateChunk(mux, IDX_FRGM, FRAGMENTS_FLAG, flags, -1, &num_fragments); + if (err != WEBP_MUX_OK) return err; + + // Verify either VP8X chunk is present OR there is only one elem in + // mux->images_. + err = ValidateChunk(mux, IDX_VP8X, NO_FLAG, flags, 1, &num_vp8x); + if (err != WEBP_MUX_OK) return err; + err = ValidateChunk(mux, IDX_VP8, NO_FLAG, flags, -1, &num_images); + if (err != WEBP_MUX_OK) return err; + if (num_vp8x == 0 && num_images != 1) return WEBP_MUX_INVALID_ARGUMENT; + + // ALPHA_FLAG & alpha chunk(s) are consistent. + if (MuxHasAlpha(mux->images_)) { + if (num_vp8x > 0) { + // VP8X chunk is present, so it should contain ALPHA_FLAG. + if (!(flags & ALPHA_FLAG)) return WEBP_MUX_INVALID_ARGUMENT; + } else { + // VP8X chunk is not present, so ALPH chunks should NOT be present either. + err = WebPMuxNumChunks(mux, WEBP_CHUNK_ALPHA, &num_alpha); + if (err != WEBP_MUX_OK) return err; + if (num_alpha > 0) return WEBP_MUX_INVALID_ARGUMENT; + } + } else { // Mux doesn't need alpha. So, ALPHA_FLAG should NOT be present. + if (flags & ALPHA_FLAG) return WEBP_MUX_INVALID_ARGUMENT; + } + + // num_fragments & num_images are consistent. + if (num_fragments > 0 && num_images != num_fragments) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + return WEBP_MUX_OK; +} + +#undef NO_FLAG + +//------------------------------------------------------------------------------ + diff --git a/src/3rdparty/libwebp/src/mux/muxread.c b/src/3rdparty/libwebp/src/mux/muxread.c new file mode 100644 index 0000000..6003a25 --- /dev/null +++ b/src/3rdparty/libwebp/src/mux/muxread.c @@ -0,0 +1,540 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the COPYING file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. +// ----------------------------------------------------------------------------- +// +// Read APIs for mux. +// +// Authors: Urvang (urvang@google.com) +// Vikas (vikasa@google.com) + +#include <assert.h> +#include "./muxi.h" +#include "../utils/utils.h" + +//------------------------------------------------------------------------------ +// Helper method(s). + +// Handy MACRO. +#define SWITCH_ID_LIST(INDEX, LIST) \ + if (idx == (INDEX)) { \ + const WebPChunk* const chunk = ChunkSearchList((LIST), nth, \ + kChunks[(INDEX)].tag); \ + if (chunk) { \ + *data = chunk->data_; \ + return WEBP_MUX_OK; \ + } else { \ + return WEBP_MUX_NOT_FOUND; \ + } \ + } + +static WebPMuxError MuxGet(const WebPMux* const mux, CHUNK_INDEX idx, + uint32_t nth, WebPData* const data) { + assert(mux != NULL); + assert(!IsWPI(kChunks[idx].id)); + WebPDataInit(data); + + SWITCH_ID_LIST(IDX_VP8X, mux->vp8x_); + SWITCH_ID_LIST(IDX_ICCP, mux->iccp_); + SWITCH_ID_LIST(IDX_ANIM, mux->anim_); + SWITCH_ID_LIST(IDX_EXIF, mux->exif_); + SWITCH_ID_LIST(IDX_XMP, mux->xmp_); + SWITCH_ID_LIST(IDX_UNKNOWN, mux->unknown_); + return WEBP_MUX_NOT_FOUND; +} +#undef SWITCH_ID_LIST + +// Fill the chunk with the given data (includes chunk header bytes), after some +// verifications. +static WebPMuxError ChunkVerifyAndAssign(WebPChunk* chunk, + const uint8_t* data, size_t data_size, + size_t riff_size, int copy_data) { + uint32_t chunk_size; + WebPData chunk_data; + + // Sanity checks. + if (data_size < TAG_SIZE) return WEBP_MUX_NOT_ENOUGH_DATA; + chunk_size = GetLE32(data + TAG_SIZE); + + { + const size_t chunk_disk_size = SizeWithPadding(chunk_size); + if (chunk_disk_size > riff_size) return WEBP_MUX_BAD_DATA; + if (chunk_disk_size > data_size) return WEBP_MUX_NOT_ENOUGH_DATA; + } + + // Data assignment. + chunk_data.bytes = data + CHUNK_HEADER_SIZE; + chunk_data.size = chunk_size; + return ChunkAssignData(chunk, &chunk_data, copy_data, GetLE32(data + 0)); +} + +int MuxImageFinalize(WebPMuxImage* const wpi) { + const WebPChunk* const img = wpi->img_; + const WebPData* const image = &img->data_; + const int is_lossless = (img->tag_ == kChunks[IDX_VP8L].tag); + int w, h; + int vp8l_has_alpha = 0; + const int ok = is_lossless ? + VP8LGetInfo(image->bytes, image->size, &w, &h, &vp8l_has_alpha) : + VP8GetInfo(image->bytes, image->size, image->size, &w, &h); + assert(img != NULL); + if (ok) { + // Ignore ALPH chunk accompanying VP8L. + if (is_lossless && (wpi->alpha_ != NULL)) { + ChunkDelete(wpi->alpha_); + wpi->alpha_ = NULL; + } + wpi->width_ = w; + wpi->height_ = h; + wpi->has_alpha_ = vp8l_has_alpha || (wpi->alpha_ != NULL); + } + return ok; +} + +static int MuxImageParse(const WebPChunk* const chunk, int copy_data, + WebPMuxImage* const wpi) { + const uint8_t* bytes = chunk->data_.bytes; + size_t size = chunk->data_.size; + const uint8_t* const last = bytes + size; + WebPChunk subchunk; + size_t subchunk_size; + ChunkInit(&subchunk); + + assert(chunk->tag_ == kChunks[IDX_ANMF].tag || + chunk->tag_ == kChunks[IDX_FRGM].tag); + assert(!wpi->is_partial_); + + // ANMF/FRGM. + { + const size_t hdr_size = (chunk->tag_ == kChunks[IDX_ANMF].tag) ? + ANMF_CHUNK_SIZE : FRGM_CHUNK_SIZE; + const WebPData temp = { bytes, hdr_size }; + // Each of ANMF and FRGM chunk contain a header at the beginning. So, its + // size should at least be 'hdr_size'. + if (size < hdr_size) goto Fail; + ChunkAssignData(&subchunk, &temp, copy_data, chunk->tag_); + } + ChunkSetNth(&subchunk, &wpi->header_, 1); + wpi->is_partial_ = 1; // Waiting for ALPH and/or VP8/VP8L chunks. + + // Rest of the chunks. + subchunk_size = ChunkDiskSize(&subchunk) - CHUNK_HEADER_SIZE; + bytes += subchunk_size; + size -= subchunk_size; + + while (bytes != last) { + ChunkInit(&subchunk); + if (ChunkVerifyAndAssign(&subchunk, bytes, size, size, + copy_data) != WEBP_MUX_OK) { + goto Fail; + } + switch (ChunkGetIdFromTag(subchunk.tag_)) { + case WEBP_CHUNK_ALPHA: + if (wpi->alpha_ != NULL) goto Fail; // Consecutive ALPH chunks. + if (ChunkSetNth(&subchunk, &wpi->alpha_, 1) != WEBP_MUX_OK) goto Fail; + wpi->is_partial_ = 1; // Waiting for a VP8 chunk. + break; + case WEBP_CHUNK_IMAGE: + if (ChunkSetNth(&subchunk, &wpi->img_, 1) != WEBP_MUX_OK) goto Fail; + if (!MuxImageFinalize(wpi)) goto Fail; + wpi->is_partial_ = 0; // wpi is completely filled. + break; + case WEBP_CHUNK_UNKNOWN: + if (wpi->is_partial_) goto Fail; // Encountered an unknown chunk + // before some image chunks. + if (ChunkSetNth(&subchunk, &wpi->unknown_, 0) != WEBP_MUX_OK) goto Fail; + break; + default: + goto Fail; + break; + } + subchunk_size = ChunkDiskSize(&subchunk); + bytes += subchunk_size; + size -= subchunk_size; + } + if (wpi->is_partial_) goto Fail; + return 1; + + Fail: + ChunkRelease(&subchunk); + return 0; +} + +//------------------------------------------------------------------------------ +// Create a mux object from WebP-RIFF data. + +WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data, + int version) { + size_t riff_size; + uint32_t tag; + const uint8_t* end; + WebPMux* mux = NULL; + WebPMuxImage* wpi = NULL; + const uint8_t* data; + size_t size; + WebPChunk chunk; + ChunkInit(&chunk); + + // Sanity checks. + if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_MUX_ABI_VERSION)) { + return NULL; // version mismatch + } + if (bitstream == NULL) return NULL; + + data = bitstream->bytes; + size = bitstream->size; + + if (data == NULL) return NULL; + if (size < RIFF_HEADER_SIZE) return NULL; + if (GetLE32(data + 0) != MKFOURCC('R', 'I', 'F', 'F') || + GetLE32(data + CHUNK_HEADER_SIZE) != MKFOURCC('W', 'E', 'B', 'P')) { + return NULL; + } + + mux = WebPMuxNew(); + if (mux == NULL) return NULL; + + if (size < RIFF_HEADER_SIZE + TAG_SIZE) goto Err; + + tag = GetLE32(data + RIFF_HEADER_SIZE); + if (tag != kChunks[IDX_VP8].tag && + tag != kChunks[IDX_VP8L].tag && + tag != kChunks[IDX_VP8X].tag) { + goto Err; // First chunk should be VP8, VP8L or VP8X. + } + + riff_size = SizeWithPadding(GetLE32(data + TAG_SIZE)); + if (riff_size > MAX_CHUNK_PAYLOAD || riff_size > size) { + goto Err; + } else { + if (riff_size < size) { // Redundant data after last chunk. + size = riff_size; // To make sure we don't read any data beyond mux_size. + } + } + + end = data + size; + data += RIFF_HEADER_SIZE; + size -= RIFF_HEADER_SIZE; + + wpi = (WebPMuxImage*)malloc(sizeof(*wpi)); + if (wpi == NULL) goto Err; + MuxImageInit(wpi); + + // Loop over chunks. + while (data != end) { + size_t data_size; + WebPChunkId id; + WebPChunk** chunk_list; + if (ChunkVerifyAndAssign(&chunk, data, size, riff_size, + copy_data) != WEBP_MUX_OK) { + goto Err; + } + data_size = ChunkDiskSize(&chunk); + id = ChunkGetIdFromTag(chunk.tag_); + switch (id) { + case WEBP_CHUNK_ALPHA: + if (wpi->alpha_ != NULL) goto Err; // Consecutive ALPH chunks. + if (ChunkSetNth(&chunk, &wpi->alpha_, 1) != WEBP_MUX_OK) goto Err; + wpi->is_partial_ = 1; // Waiting for a VP8 chunk. + break; + case WEBP_CHUNK_IMAGE: + if (ChunkSetNth(&chunk, &wpi->img_, 1) != WEBP_MUX_OK) goto Err; + if (!MuxImageFinalize(wpi)) goto Err; + wpi->is_partial_ = 0; // wpi is completely filled. + PushImage: + // Add this to mux->images_ list. + if (MuxImagePush(wpi, &mux->images_) != WEBP_MUX_OK) goto Err; + MuxImageInit(wpi); // Reset for reading next image. + break; + case WEBP_CHUNK_ANMF: +#ifdef WEBP_EXPERIMENTAL_FEATURES + case WEBP_CHUNK_FRGM: +#endif + if (wpi->is_partial_) goto Err; // Previous wpi is still incomplete. + if (!MuxImageParse(&chunk, copy_data, wpi)) goto Err; + ChunkRelease(&chunk); + goto PushImage; + break; + default: // A non-image chunk. + if (wpi->is_partial_) goto Err; // Encountered a non-image chunk before + // getting all chunks of an image. + chunk_list = MuxGetChunkListFromId(mux, id); // List to add this chunk. + if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err; + break; + } + data += data_size; + size -= data_size; + ChunkInit(&chunk); + } + + // Validate mux if complete. + if (MuxValidate(mux) != WEBP_MUX_OK) goto Err; + + MuxImageDelete(wpi); + return mux; // All OK; + + Err: // Something bad happened. + ChunkRelease(&chunk); + MuxImageDelete(wpi); + WebPMuxDelete(mux); + return NULL; +} + +//------------------------------------------------------------------------------ +// Get API(s). + +// Validates that the given mux has a single image. +static WebPMuxError ValidateForSingleImage(const WebPMux* const mux) { + const int num_images = MuxImageCount(mux->images_, WEBP_CHUNK_IMAGE); + const int num_frames = MuxImageCount(mux->images_, WEBP_CHUNK_ANMF); + const int num_fragments = MuxImageCount(mux->images_, WEBP_CHUNK_FRGM); + + if (num_images == 0) { + // No images in mux. + return WEBP_MUX_NOT_FOUND; + } else if (num_images == 1 && num_frames == 0 && num_fragments == 0) { + // Valid case (single image). + return WEBP_MUX_OK; + } else { + // Frame/Fragment case OR an invalid mux. + return WEBP_MUX_INVALID_ARGUMENT; + } +} + +// Get the canvas width, height and flags after validating that VP8X/VP8/VP8L +// chunk and canvas size are valid. +static WebPMuxError MuxGetCanvasInfo(const WebPMux* const mux, + int* width, int* height, uint32_t* flags) { + int w, h; + uint32_t f = 0; + WebPData data; + assert(mux != NULL); + + // Check if VP8X chunk is present. + if (MuxGet(mux, IDX_VP8X, 1, &data) == WEBP_MUX_OK) { + if (data.size < VP8X_CHUNK_SIZE) return WEBP_MUX_BAD_DATA; + f = GetLE32(data.bytes + 0); + w = GetLE24(data.bytes + 4) + 1; + h = GetLE24(data.bytes + 7) + 1; + } else { // Single image case. + const WebPMuxImage* const wpi = mux->images_; + WebPMuxError err = ValidateForSingleImage(mux); + if (err != WEBP_MUX_OK) return err; + assert(wpi != NULL); + w = wpi->width_; + h = wpi->height_; + if (wpi->has_alpha_) f |= ALPHA_FLAG; + } + if (w * (uint64_t)h >= MAX_IMAGE_AREA) return WEBP_MUX_BAD_DATA; + + if (width != NULL) *width = w; + if (height != NULL) *height = h; + if (flags != NULL) *flags = f; + return WEBP_MUX_OK; +} + +WebPMuxError WebPMuxGetCanvasSize(const WebPMux* mux, int* width, int* height) { + if (mux == NULL || width == NULL || height == NULL) { + return WEBP_MUX_INVALID_ARGUMENT; + } + return MuxGetCanvasInfo(mux, width, height, NULL); +} + +WebPMuxError WebPMuxGetFeatures(const WebPMux* mux, uint32_t* flags) { + if (mux == NULL || flags == NULL) return WEBP_MUX_INVALID_ARGUMENT; + return MuxGetCanvasInfo(mux, NULL, NULL, flags); +} + +static uint8_t* EmitVP8XChunk(uint8_t* const dst, int width, + int height, uint32_t flags) { + const size_t vp8x_size = CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE; + assert(width >= 1 && height >= 1); + assert(width <= MAX_CANVAS_SIZE && height <= MAX_CANVAS_SIZE); + assert(width * (uint64_t)height < MAX_IMAGE_AREA); + PutLE32(dst, MKFOURCC('V', 'P', '8', 'X')); + PutLE32(dst + TAG_SIZE, VP8X_CHUNK_SIZE); + PutLE32(dst + CHUNK_HEADER_SIZE, flags); + PutLE24(dst + CHUNK_HEADER_SIZE + 4, width - 1); + PutLE24(dst + CHUNK_HEADER_SIZE + 7, height - 1); + return dst + vp8x_size; +} + +// Assemble a single image WebP bitstream from 'wpi'. +static WebPMuxError SynthesizeBitstream(const WebPMuxImage* const wpi, + WebPData* const bitstream) { + uint8_t* dst; + + // Allocate data. + const int need_vp8x = (wpi->alpha_ != NULL); + const size_t vp8x_size = need_vp8x ? CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE : 0; + const size_t alpha_size = need_vp8x ? ChunkDiskSize(wpi->alpha_) : 0; + // Note: No need to output ANMF/FRGM chunk for a single image. + const size_t size = RIFF_HEADER_SIZE + vp8x_size + alpha_size + + ChunkDiskSize(wpi->img_); + uint8_t* const data = (uint8_t*)malloc(size); + if (data == NULL) return WEBP_MUX_MEMORY_ERROR; + + // Main RIFF header. + dst = MuxEmitRiffHeader(data, size); + + if (need_vp8x) { + dst = EmitVP8XChunk(dst, wpi->width_, wpi->height_, ALPHA_FLAG); // VP8X. + dst = ChunkListEmit(wpi->alpha_, dst); // ALPH. + } + + // Bitstream. + dst = ChunkListEmit(wpi->img_, dst); + assert(dst == data + size); + + // Output. + bitstream->bytes = data; + bitstream->size = size; + return WEBP_MUX_OK; +} + +WebPMuxError WebPMuxGetChunk(const WebPMux* mux, const char fourcc[4], + WebPData* chunk_data) { + CHUNK_INDEX idx; + if (mux == NULL || fourcc == NULL || chunk_data == NULL) { + return WEBP_MUX_INVALID_ARGUMENT; + } + idx = ChunkGetIndexFromFourCC(fourcc); + if (IsWPI(kChunks[idx].id)) { // An image chunk. + return WEBP_MUX_INVALID_ARGUMENT; + } else if (idx != IDX_UNKNOWN) { // A known chunk type. + return MuxGet(mux, idx, 1, chunk_data); + } else { // An unknown chunk type. + const WebPChunk* const chunk = + ChunkSearchList(mux->unknown_, 1, ChunkGetTagFromFourCC(fourcc)); + if (chunk == NULL) return WEBP_MUX_NOT_FOUND; + *chunk_data = chunk->data_; + return WEBP_MUX_OK; + } +} + +static WebPMuxError MuxGetImageInternal(const WebPMuxImage* const wpi, + WebPMuxFrameInfo* const info) { + // Set some defaults for unrelated fields. + info->x_offset = 0; + info->y_offset = 0; + info->duration = 1; + info->dispose_method = WEBP_MUX_DISPOSE_NONE; + info->blend_method = WEBP_MUX_BLEND; + // Extract data for related fields. + info->id = ChunkGetIdFromTag(wpi->img_->tag_); + return SynthesizeBitstream(wpi, &info->bitstream); +} + +static WebPMuxError MuxGetFrameFragmentInternal(const WebPMuxImage* const wpi, + WebPMuxFrameInfo* const frame) { + const int is_frame = (wpi->header_->tag_ == kChunks[IDX_ANMF].tag); + const CHUNK_INDEX idx = is_frame ? IDX_ANMF : IDX_FRGM; + const WebPData* frame_frgm_data; +#ifndef WEBP_EXPERIMENTAL_FEATURES + if (!is_frame) return WEBP_MUX_INVALID_ARGUMENT; +#endif + assert(wpi->header_ != NULL); // Already checked by WebPMuxGetFrame(). + // Get frame/fragment chunk. + frame_frgm_data = &wpi->header_->data_; + if (frame_frgm_data->size < kChunks[idx].size) return WEBP_MUX_BAD_DATA; + // Extract info. + frame->x_offset = 2 * GetLE24(frame_frgm_data->bytes + 0); + frame->y_offset = 2 * GetLE24(frame_frgm_data->bytes + 3); + if (is_frame) { + const uint8_t bits = frame_frgm_data->bytes[15]; + frame->duration = GetLE24(frame_frgm_data->bytes + 12); + frame->dispose_method = + (bits & 1) ? WEBP_MUX_DISPOSE_BACKGROUND : WEBP_MUX_DISPOSE_NONE; + frame->blend_method = (bits & 2) ? WEBP_MUX_NO_BLEND : WEBP_MUX_BLEND; + } else { // Defaults for unused values. + frame->duration = 1; + frame->dispose_method = WEBP_MUX_DISPOSE_NONE; + frame->blend_method = WEBP_MUX_BLEND; + } + frame->id = ChunkGetIdFromTag(wpi->header_->tag_); + return SynthesizeBitstream(wpi, &frame->bitstream); +} + +WebPMuxError WebPMuxGetFrame( + const WebPMux* mux, uint32_t nth, WebPMuxFrameInfo* frame) { + WebPMuxError err; + WebPMuxImage* wpi; + + // Sanity checks. + if (mux == NULL || frame == NULL) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + // Get the nth WebPMuxImage. + err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, nth, &wpi); + if (err != WEBP_MUX_OK) return err; + + // Get frame info. + if (wpi->header_ == NULL) { + return MuxGetImageInternal(wpi, frame); + } else { + return MuxGetFrameFragmentInternal(wpi, frame); + } +} + +WebPMuxError WebPMuxGetAnimationParams(const WebPMux* mux, + WebPMuxAnimParams* params) { + WebPData anim; + WebPMuxError err; + + if (mux == NULL || params == NULL) return WEBP_MUX_INVALID_ARGUMENT; + + err = MuxGet(mux, IDX_ANIM, 1, &anim); + if (err != WEBP_MUX_OK) return err; + if (anim.size < kChunks[WEBP_CHUNK_ANIM].size) return WEBP_MUX_BAD_DATA; + params->bgcolor = GetLE32(anim.bytes); + params->loop_count = GetLE16(anim.bytes + 4); + + return WEBP_MUX_OK; +} + +// Get chunk index from chunk id. Returns IDX_NIL if not found. +static CHUNK_INDEX ChunkGetIndexFromId(WebPChunkId id) { + int i; + for (i = 0; kChunks[i].id != WEBP_CHUNK_NIL; ++i) { + if (id == kChunks[i].id) return (CHUNK_INDEX)i; + } + return IDX_NIL; +} + +// Count number of chunks matching 'tag' in the 'chunk_list'. +// If tag == NIL_TAG, any tag will be matched. +static int CountChunks(const WebPChunk* const chunk_list, uint32_t tag) { + int count = 0; + const WebPChunk* current; + for (current = chunk_list; current != NULL; current = current->next_) { + if (tag == NIL_TAG || current->tag_ == tag) { + count++; // Count chunks whose tags match. + } + } + return count; +} + +WebPMuxError WebPMuxNumChunks(const WebPMux* mux, + WebPChunkId id, int* num_elements) { + if (mux == NULL || num_elements == NULL) { + return WEBP_MUX_INVALID_ARGUMENT; + } + + if (IsWPI(id)) { + *num_elements = MuxImageCount(mux->images_, id); + } else { + WebPChunk* const* chunk_list = MuxGetChunkListFromId(mux, id); + const CHUNK_INDEX idx = ChunkGetIndexFromId(id); + *num_elements = CountChunks(*chunk_list, kChunks[idx].tag); + } + + return WEBP_MUX_OK; +} + +//------------------------------------------------------------------------------ + |