// 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"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
//------------------------------------------------------------------------------
// 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;
}
}
static void DeleteAllChunks(WebPChunk** const chunk_list) {
while (*chunk_list) {
*chunk_list = ChunkDelete(*chunk_list);
}
}
static void MuxRelease(WebPMux* const mux) {
if (mux == NULL) return;
MuxImageDeleteAll(&mux->images_);
DeleteAllChunks(&mux->vp8x_);
DeleteAllChunks(&mux->iccp_);
DeleteAllChunks(&mux->anim_);
DeleteAllChunks(&mux->exif_);
DeleteAllChunks(&mux->xmp_);
DeleteAllChunks(&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, kChunks[(INDEX)].tag); \
if (err == WEBP_MUX_OK) { \
err = ChunkSetNth(&chunk, (LIST), nth); \
} \
return err; \
}
static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
const WebPData* const data, int copy_data) {
WebPChunk chunk;
WebPMuxError err = WEBP_MUX_NOT_FOUND;
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_);
if (idx == IDX_UNKNOWN && data->size > TAG_SIZE) {
// For raw-data unknown chunk, the first four bytes should be the tag to be
// used for the chunk.
const WebPData tmp = { data->bytes + TAG_SIZE, data->size - TAG_SIZE };
err = ChunkAssignData(&chunk, &tmp, copy_data, GetLE32(data->bytes + 0));
if (err == WEBP_MUX_OK)
err = ChunkSetNth(&chunk, &mux->unknown_, nth);
}
return err;
}
#undef SWITCH_ID_LIST
static WebPMuxError MuxAddChunk(WebPMux* const mux, uint32_t nth, uint32_t tag,
const uint8_t* data, size_t size,
int copy_data) {
const CHUNK_INDEX idx = ChunkGetIndexFromTag(tag);
const WebPData chunk_data = { data, size };
assert(mux != NULL);
assert(size <= MAX_CHUNK_PAYLOAD);
assert(idx != IDX_NIL);
return MuxSet(mux, idx, nth, &chunk_data, copy_data);
}
// Create data for frame/fragment given image data, offsets and duration.
static WebPMuxError CreateFrameFragmentData(
const WebPData* const image, int x_offset, int y_offset, int duration,
WebPMuxAnimDispose dispose_method, int is_lossless, int is_frame,
WebPData* const frame_frgm) {
int width;
int height;
uint8_t* frame_frgm_bytes;
const size_t frame_frgm_size = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].size;
const int ok = is_lossless ?
VP8LGetInfo(image->bytes, image->size, &width, &height, NULL) :
VP8GetInfo(image->bytes, image->size, image->size, &width, &height);
if (!ok) return WEBP_MUX_INVALID_ARGUMENT;
assert(width > 0 && height > 0 && duration >= 0);
assert(dispose_method == (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, x_offset / 2);
PutLE24(frame_frgm_bytes + 3, 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, duration);
frame_frgm_bytes[15] = (dispose_method & 1);
}
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);
WebPChunk** chunk_list;
assert(mux != NULL);
if (IsWPI(id)) return WEBP_MUX_INVALID_ARGUMENT;
chunk_list = MuxGetChunkListFromId(mux, id);
if (chunk_list == NULL) return WEBP_MUX_INVALID_ARGUMENT;
return DeleteChunks(chunk_list, tag);
}
//------------------------------------------------------------------------------
// Set API(s).
WebPMuxError WebPMuxSetChunk(WebPMux* mux, const char fourcc[4],
const WebPData* chunk_data, int copy_data) {
CHUNK_INDEX idx;
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;
}
idx = ChunkGetIndexFromFourCC(fourcc);
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, idx, 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;
}
return AddDataToChunkList(&image, copy_data, image_tag, &wpi->img_);
}
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.
MuxImageDeleteAll(&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.
{
const int is_lossless = (wpi.img_->tag_ == kChunks[IDX_VP8L].tag);
const int x_offset = frame->x_offset & ~1; // Snap offsets to even.
const int y_offset = frame->y_offset & ~1;
const int duration = is_frame ? frame->duration : 1 /* unused */;
const WebPMuxAnimDispose dispose_method =
is_frame ? frame->dispose_method : 0 /* unused */;
const uint32_t tag = kChunks[is_frame ? IDX_ANMF : IDX_FRGM].tag;
WebPData frame_frgm;
if (x_offset < 0 || x_offset >= MAX_POSITION_OFFSET ||
y_offset < 0 || y_offset >= MAX_POSITION_OFFSET ||
(duration < 0 || duration >= MAX_DURATION) ||
dispose_method != (dispose_method & 1)) {
err = WEBP_MUX_INVALID_ARGUMENT;
goto Err;
}
err = CreateFrameFragmentData(&wpi.img_->data_, x_offset, y_offset,
duration, dispose_method, is_lossless,
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];
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 MuxAddChunk(mux, 1, kChunks[IDX_ANIM].tag, data, sizeof(data), 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;
}
WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
int* const width, int* const height) {
const uint32_t tag = image_chunk->tag_;
const WebPData* const data = &image_chunk->data_;
int w, h;
int ok;
assert(image_chunk != NULL);
assert(tag == kChunks[IDX_VP8].tag || tag == kChunks[IDX_VP8L].tag);
ok = (tag == kChunks[IDX_VP8].tag) ?
VP8GetInfo(data->bytes, data->size, data->size, &w, &h) :
VP8LGetInfo(data->bytes, data->size, &w, &h, NULL);
if (ok) {
*width = w;
*height = h;
return WEBP_MUX_OK;
} else {
return WEBP_MUX_BAD_DATA;
}
}
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 image_chunk = wpi->img_;
const WebPChunk* const frame_frgm_chunk = wpi->header_;
// Get offsets and duration from ANMF/FRGM chunk.
const WebPMuxError 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.
return MuxGetImageWidthHeight(image_chunk, width, height);
}
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_) {
int max_x = 0;
int max_y = 0;
int64_t image_area = 0;
// 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, extract the width & height from VP8/VP8L image-data.
int w, h;
const WebPChunk* const image_chunk = wpi->img_;
const WebPMuxError err = MuxGetImageWidthHeight(image_chunk, &w, &h);
if (err != WEBP_MUX_OK) return err;
*width = w;
*height = h;
}
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 size_t data_size = 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 (MuxHasLosslessImages(images)) {
// We have a file with a VP8X chunk having some lossless images.
// As lossless images implicitly contain alpha, force ALPHA_FLAG to be true.
// 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.
err = MuxAddChunk(mux, 1, kChunks[IDX_VP8X].tag, data, data_size, 1);
return err;
}
// 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;
}
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 = ChunksListDiskSize(mux->vp8x_) + ChunksListDiskSize(mux->iccp_)
+ ChunksListDiskSize(mux->anim_) + MuxImageListDiskSize(mux->images_)
+ ChunksListDiskSize(mux->exif_) + ChunksListDiskSize(mux->xmp_)
+ ChunksListDiskSize(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 = MuxImageListEmit(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;
}
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif