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713 lines
23 KiB
C
713 lines
23 KiB
C
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// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Set and delete APIs for mux.
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//
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// Authors: Urvang (urvang@google.com)
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// Vikas (vikasa@google.com)
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#include <assert.h>
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#include "./muxi.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// Life of a mux object.
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static void MuxInit(WebPMux* const mux) {
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if (mux == NULL) return;
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memset(mux, 0, sizeof(*mux));
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}
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WebPMux* WebPNewInternal(int version) {
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if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_MUX_ABI_VERSION)) {
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return NULL;
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} else {
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WebPMux* const mux = (WebPMux*)malloc(sizeof(WebPMux));
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// If mux is NULL MuxInit is a noop.
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MuxInit(mux);
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return mux;
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}
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}
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static void DeleteAllChunks(WebPChunk** const chunk_list) {
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while (*chunk_list) {
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*chunk_list = ChunkDelete(*chunk_list);
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}
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}
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static void MuxRelease(WebPMux* const mux) {
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if (mux == NULL) return;
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MuxImageDeleteAll(&mux->images_);
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DeleteAllChunks(&mux->vp8x_);
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DeleteAllChunks(&mux->iccp_);
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DeleteAllChunks(&mux->loop_);
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DeleteAllChunks(&mux->meta_);
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DeleteAllChunks(&mux->unknown_);
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}
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void WebPMuxDelete(WebPMux* mux) {
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// If mux is NULL MuxRelease is a noop.
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MuxRelease(mux);
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free(mux);
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}
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//------------------------------------------------------------------------------
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// Helper method(s).
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// Handy MACRO, makes MuxSet() very symmetric to MuxGet().
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#define SWITCH_ID_LIST(INDEX, LIST) \
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if (idx == (INDEX)) { \
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err = ChunkAssignData(&chunk, data, copy_data, kChunks[(INDEX)].tag); \
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if (err == WEBP_MUX_OK) { \
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err = ChunkSetNth(&chunk, (LIST), nth); \
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} \
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return err; \
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}
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static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
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const WebPData* const data, int copy_data) {
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WebPChunk chunk;
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WebPMuxError err = WEBP_MUX_NOT_FOUND;
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assert(mux != NULL);
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assert(!IsWPI(kChunks[idx].id));
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ChunkInit(&chunk);
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SWITCH_ID_LIST(IDX_VP8X, &mux->vp8x_);
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SWITCH_ID_LIST(IDX_ICCP, &mux->iccp_);
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SWITCH_ID_LIST(IDX_LOOP, &mux->loop_);
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SWITCH_ID_LIST(IDX_META, &mux->meta_);
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if (idx == IDX_UNKNOWN && data->size_ > TAG_SIZE) {
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// For raw-data unknown chunk, the first four bytes should be the tag to be
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// used for the chunk.
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const WebPData tmp = { data->bytes_ + TAG_SIZE, data->size_ - TAG_SIZE };
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err = ChunkAssignData(&chunk, &tmp, copy_data, GetLE32(data->bytes_ + 0));
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if (err == WEBP_MUX_OK)
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err = ChunkSetNth(&chunk, &mux->unknown_, nth);
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}
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return err;
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}
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#undef SWITCH_ID_LIST
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static WebPMuxError MuxAddChunk(WebPMux* const mux, uint32_t nth, uint32_t tag,
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const uint8_t* data, size_t size,
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int copy_data) {
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const CHUNK_INDEX idx = ChunkGetIndexFromTag(tag);
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const WebPData chunk_data = { data, size };
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assert(mux != NULL);
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assert(size <= MAX_CHUNK_PAYLOAD);
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assert(idx != IDX_NIL);
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return MuxSet(mux, idx, nth, &chunk_data, copy_data);
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}
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// Create data for frame/tile given image data, offsets and duration.
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static WebPMuxError CreateFrameTileData(const WebPData* const image,
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int x_offset, int y_offset,
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int duration, int is_lossless,
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int is_frame,
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WebPData* const frame_tile) {
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int width;
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int height;
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uint8_t* frame_tile_bytes;
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const size_t frame_tile_size = kChunks[is_frame ? IDX_FRAME : IDX_TILE].size;
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const int ok = is_lossless ?
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VP8LGetInfo(image->bytes_, image->size_, &width, &height, NULL) :
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VP8GetInfo(image->bytes_, image->size_, image->size_, &width, &height);
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if (!ok) return WEBP_MUX_INVALID_ARGUMENT;
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assert(width > 0 && height > 0 && duration > 0);
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// Note: assertion on upper bounds is done in PutLE24().
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frame_tile_bytes = (uint8_t*)malloc(frame_tile_size);
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if (frame_tile_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
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PutLE24(frame_tile_bytes + 0, x_offset / 2);
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PutLE24(frame_tile_bytes + 3, y_offset / 2);
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if (is_frame) {
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PutLE24(frame_tile_bytes + 6, width - 1);
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PutLE24(frame_tile_bytes + 9, height - 1);
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PutLE24(frame_tile_bytes + 12, duration - 1);
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}
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frame_tile->bytes_ = frame_tile_bytes;
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frame_tile->size_ = frame_tile_size;
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return WEBP_MUX_OK;
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}
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// Outputs image data given a bitstream. The bitstream can either be a
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// single-image WebP file or raw VP8/VP8L data.
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// Also outputs 'is_lossless' to be true if the given bitstream is lossless.
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static WebPMuxError GetImageData(const WebPData* const bitstream,
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WebPData* const image, WebPData* const alpha,
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int* const is_lossless) {
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WebPDataInit(alpha); // Default: no alpha.
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if (bitstream->size_ < TAG_SIZE ||
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memcmp(bitstream->bytes_, "RIFF", TAG_SIZE)) {
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// It is NOT webp file data. Return input data as is.
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*image = *bitstream;
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} else {
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// It is webp file data. Extract image data from it.
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const WebPMuxImage* wpi;
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WebPMux* const mux = WebPMuxCreate(bitstream, 0);
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if (mux == NULL) return WEBP_MUX_BAD_DATA;
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wpi = mux->images_;
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assert(wpi != NULL && wpi->img_ != NULL);
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*image = wpi->img_->data_;
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if (wpi->alpha_ != NULL) {
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*alpha = wpi->alpha_->data_;
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}
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WebPMuxDelete(mux);
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}
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*is_lossless = VP8LCheckSignature(image->bytes_, image->size_);
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return WEBP_MUX_OK;
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}
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static WebPMuxError DeleteChunks(WebPChunk** chunk_list, uint32_t tag) {
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WebPMuxError err = WEBP_MUX_NOT_FOUND;
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assert(chunk_list);
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while (*chunk_list) {
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WebPChunk* const chunk = *chunk_list;
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if (chunk->tag_ == tag) {
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*chunk_list = ChunkDelete(chunk);
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err = WEBP_MUX_OK;
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} else {
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chunk_list = &chunk->next_;
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}
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}
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return err;
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}
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static WebPMuxError MuxDeleteAllNamedData(WebPMux* const mux, CHUNK_INDEX idx) {
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const WebPChunkId id = kChunks[idx].id;
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WebPChunk** chunk_list;
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if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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if (IsWPI(id)) return WEBP_MUX_INVALID_ARGUMENT;
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chunk_list = MuxGetChunkListFromId(mux, id);
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if (chunk_list == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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return DeleteChunks(chunk_list, kChunks[idx].tag);
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}
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static WebPMuxError DeleteLoopCount(WebPMux* const mux) {
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return MuxDeleteAllNamedData(mux, IDX_LOOP);
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}
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//------------------------------------------------------------------------------
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// Set API(s).
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WebPMuxError WebPMuxSetImage(WebPMux* mux,
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const WebPData* bitstream, int copy_data) {
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WebPMuxError err;
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WebPChunk chunk;
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WebPMuxImage wpi;
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WebPData image;
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WebPData alpha;
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int is_lossless;
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int image_tag;
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if (mux == NULL || bitstream == NULL || bitstream->bytes_ == NULL ||
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bitstream->size_ > MAX_CHUNK_PAYLOAD) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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// If given data is for a whole webp file,
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// extract only the VP8/VP8L data from it.
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err = GetImageData(bitstream, &image, &alpha, &is_lossless);
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if (err != WEBP_MUX_OK) return err;
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image_tag = is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
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// Delete the existing images.
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MuxImageDeleteAll(&mux->images_);
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MuxImageInit(&wpi);
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if (alpha.bytes_ != NULL) { // Add alpha chunk.
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ChunkInit(&chunk);
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err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
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if (err != WEBP_MUX_OK) goto Err;
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err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
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if (err != WEBP_MUX_OK) goto Err;
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}
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// Add image chunk.
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ChunkInit(&chunk);
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err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
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if (err != WEBP_MUX_OK) goto Err;
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err = ChunkSetNth(&chunk, &wpi.img_, 1);
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if (err != WEBP_MUX_OK) goto Err;
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// Add this image to mux.
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err = MuxImagePush(&wpi, &mux->images_);
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if (err != WEBP_MUX_OK) goto Err;
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// All OK.
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return WEBP_MUX_OK;
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Err:
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// Something bad happened.
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ChunkRelease(&chunk);
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MuxImageRelease(&wpi);
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return err;
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}
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WebPMuxError WebPMuxSetMetadata(WebPMux* mux, const WebPData* metadata,
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int copy_data) {
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WebPMuxError err;
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if (mux == NULL || metadata == NULL || metadata->bytes_ == NULL ||
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metadata->size_ > MAX_CHUNK_PAYLOAD) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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// Delete the existing metadata chunk(s).
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err = WebPMuxDeleteMetadata(mux);
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if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
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// Add the given metadata chunk.
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return MuxSet(mux, IDX_META, 1, metadata, copy_data);
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}
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WebPMuxError WebPMuxSetColorProfile(WebPMux* mux, const WebPData* color_profile,
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int copy_data) {
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WebPMuxError err;
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if (mux == NULL || color_profile == NULL || color_profile->bytes_ == NULL ||
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color_profile->size_ > MAX_CHUNK_PAYLOAD) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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// Delete the existing ICCP chunk(s).
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err = WebPMuxDeleteColorProfile(mux);
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if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
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// Add the given ICCP chunk.
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return MuxSet(mux, IDX_ICCP, 1, color_profile, copy_data);
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}
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WebPMuxError WebPMuxSetLoopCount(WebPMux* mux, int loop_count) {
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WebPMuxError err;
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uint8_t* data = NULL;
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if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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if (loop_count >= MAX_LOOP_COUNT) return WEBP_MUX_INVALID_ARGUMENT;
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// Delete the existing LOOP chunk(s).
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err = DeleteLoopCount(mux);
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if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
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// Add the given loop count.
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data = (uint8_t*)malloc(kChunks[IDX_LOOP].size);
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if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
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PutLE16(data, loop_count);
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err = MuxAddChunk(mux, 1, kChunks[IDX_LOOP].tag, data,
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kChunks[IDX_LOOP].size, 1);
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free(data);
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return err;
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}
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static WebPMuxError MuxPushFrameTileInternal(
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WebPMux* const mux, const WebPData* const bitstream, int x_offset,
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int y_offset, int duration, int copy_data, uint32_t tag) {
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WebPChunk chunk;
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WebPData image;
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WebPData alpha;
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WebPMuxImage wpi;
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WebPMuxError err;
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WebPData frame_tile;
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const int is_frame = (tag == kChunks[IDX_FRAME].tag) ? 1 : 0;
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int is_lossless;
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int image_tag;
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// Sanity checks.
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if (mux == NULL || bitstream == NULL || bitstream->bytes_ == NULL ||
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bitstream->size_ > MAX_CHUNK_PAYLOAD) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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if (x_offset < 0 || x_offset >= MAX_POSITION_OFFSET ||
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y_offset < 0 || y_offset >= MAX_POSITION_OFFSET ||
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duration <= 0 || duration > MAX_DURATION) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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// Snap offsets to even positions.
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x_offset &= ~1;
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y_offset &= ~1;
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// If given data is for a whole webp file,
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// extract only the VP8/VP8L data from it.
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err = GetImageData(bitstream, &image, &alpha, &is_lossless);
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if (err != WEBP_MUX_OK) return err;
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image_tag = is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
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WebPDataInit(&frame_tile);
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ChunkInit(&chunk);
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MuxImageInit(&wpi);
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if (alpha.bytes_ != NULL) {
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// Add alpha chunk.
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err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
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if (err != WEBP_MUX_OK) goto Err;
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err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
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if (err != WEBP_MUX_OK) goto Err;
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ChunkInit(&chunk); // chunk owned by wpi.alpha_ now.
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}
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// Add image chunk.
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err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
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if (err != WEBP_MUX_OK) goto Err;
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err = ChunkSetNth(&chunk, &wpi.img_, 1);
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if (err != WEBP_MUX_OK) goto Err;
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ChunkInit(&chunk); // chunk owned by wpi.img_ now.
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// Create frame/tile data.
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err = CreateFrameTileData(&image, x_offset, y_offset, duration, is_lossless,
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is_frame, &frame_tile);
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if (err != WEBP_MUX_OK) goto Err;
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// Add frame/tile chunk (with copy_data = 1).
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err = ChunkAssignData(&chunk, &frame_tile, 1, tag);
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if (err != WEBP_MUX_OK) goto Err;
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WebPDataClear(&frame_tile);
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err = ChunkSetNth(&chunk, &wpi.header_, 1);
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if (err != WEBP_MUX_OK) goto Err;
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ChunkInit(&chunk); // chunk owned by wpi.header_ now.
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// Add this WebPMuxImage to mux.
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err = MuxImagePush(&wpi, &mux->images_);
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if (err != WEBP_MUX_OK) goto Err;
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// All is well.
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return WEBP_MUX_OK;
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Err: // Something bad happened.
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WebPDataClear(&frame_tile);
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ChunkRelease(&chunk);
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MuxImageRelease(&wpi);
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return err;
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}
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|
||
|
WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPData* bitstream,
|
||
|
int x_offset, int y_offset,
|
||
|
int duration, int copy_data) {
|
||
|
return MuxPushFrameTileInternal(mux, bitstream, x_offset, y_offset,
|
||
|
duration, copy_data, kChunks[IDX_FRAME].tag);
|
||
|
}
|
||
|
|
||
|
WebPMuxError WebPMuxPushTile(WebPMux* mux, const WebPData* bitstream,
|
||
|
int x_offset, int y_offset,
|
||
|
int copy_data) {
|
||
|
return MuxPushFrameTileInternal(mux, bitstream, x_offset, y_offset,
|
||
|
1 /* unused duration */, copy_data,
|
||
|
kChunks[IDX_TILE].tag);
|
||
|
}
|
||
|
|
||
|
//------------------------------------------------------------------------------
|
||
|
// Delete API(s).
|
||
|
|
||
|
WebPMuxError WebPMuxDeleteImage(WebPMux* mux) {
|
||
|
WebPMuxError err;
|
||
|
|
||
|
if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
|
||
|
|
||
|
err = MuxValidateForImage(mux);
|
||
|
if (err != WEBP_MUX_OK) return err;
|
||
|
|
||
|
// All well, delete image.
|
||
|
MuxImageDeleteAll(&mux->images_);
|
||
|
return WEBP_MUX_OK;
|
||
|
}
|
||
|
|
||
|
WebPMuxError WebPMuxDeleteMetadata(WebPMux* mux) {
|
||
|
return MuxDeleteAllNamedData(mux, IDX_META);
|
||
|
}
|
||
|
|
||
|
WebPMuxError WebPMuxDeleteColorProfile(WebPMux* mux) {
|
||
|
return MuxDeleteAllNamedData(mux, IDX_ICCP);
|
||
|
}
|
||
|
|
||
|
static WebPMuxError DeleteFrameTileInternal(WebPMux* const mux, uint32_t nth,
|
||
|
CHUNK_INDEX idx) {
|
||
|
const WebPChunkId id = kChunks[idx].id;
|
||
|
if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
|
||
|
|
||
|
assert(idx == IDX_FRAME || idx == IDX_TILE);
|
||
|
return MuxImageDeleteNth(&mux->images_, nth, id);
|
||
|
}
|
||
|
|
||
|
WebPMuxError WebPMuxDeleteFrame(WebPMux* mux, uint32_t nth) {
|
||
|
return DeleteFrameTileInternal(mux, nth, IDX_FRAME);
|
||
|
}
|
||
|
|
||
|
WebPMuxError WebPMuxDeleteTile(WebPMux* mux, uint32_t nth) {
|
||
|
return DeleteFrameTileInternal(mux, nth, IDX_TILE);
|
||
|
}
|
||
|
|
||
|
//------------------------------------------------------------------------------
|
||
|
// Assembly of the WebP RIFF file.
|
||
|
|
||
|
static WebPMuxError GetFrameTileInfo(const WebPChunk* const frame_tile_chunk,
|
||
|
int* const x_offset, int* const y_offset,
|
||
|
int* const duration) {
|
||
|
const uint32_t tag = frame_tile_chunk->tag_;
|
||
|
const int is_frame = (tag == kChunks[IDX_FRAME].tag);
|
||
|
const WebPData* const data = &frame_tile_chunk->data_;
|
||
|
const size_t expected_data_size =
|
||
|
is_frame ? FRAME_CHUNK_SIZE : TILE_CHUNK_SIZE;
|
||
|
assert(frame_tile_chunk != NULL);
|
||
|
assert(tag == kChunks[IDX_FRAME].tag || tag == kChunks[IDX_TILE].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 = 1 + 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_tile_chunk = wpi->header_;
|
||
|
|
||
|
// Get offsets and duration from FRM/TILE chunk.
|
||
|
const WebPMuxError err =
|
||
|
GetFrameTileInfo(frame_tile_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 & tiled images.
|
||
|
for (; wpi != NULL; wpi = wpi->next_) {
|
||
|
int x_offset, y_offset, duration, w, h;
|
||
|
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 tile
|
||
|
// images. Check that the aggregated image area for individual tiles exactly
|
||
|
// matches the image area of the constructed canvas. However, the area-match
|
||
|
// is necessary but not sufficient condition.
|
||
|
if ((flags & TILE_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, IDX_VP8X);
|
||
|
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->meta_ != NULL && mux->meta_->data_.bytes_ != NULL) {
|
||
|
flags |= META_FLAG;
|
||
|
}
|
||
|
|
||
|
if (images->header_ != NULL) {
|
||
|
if (images->header_->tag_ == kChunks[IDX_TILE].tag) {
|
||
|
// This is a tiled image.
|
||
|
flags |= TILE_FLAG;
|
||
|
} else if (images->header_->tag_ == kChunks[IDX_FRAME].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;
|
||
|
}
|
||
|
|
||
|
WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
|
||
|
size_t size = 0;
|
||
|
uint8_t* data = NULL;
|
||
|
uint8_t* dst = NULL;
|
||
|
int num_frames;
|
||
|
int num_loop_chunks;
|
||
|
WebPMuxError err;
|
||
|
|
||
|
if (mux == NULL || assembled_data == NULL) {
|
||
|
return WEBP_MUX_INVALID_ARGUMENT;
|
||
|
}
|
||
|
|
||
|
// Remove LOOP chunk if unnecessary.
|
||
|
err = WebPMuxNumChunks(mux, kChunks[IDX_LOOP].id, &num_loop_chunks);
|
||
|
if (err != WEBP_MUX_OK) return err;
|
||
|
if (num_loop_chunks >= 1) {
|
||
|
err = WebPMuxNumChunks(mux, kChunks[IDX_FRAME].id, &num_frames);
|
||
|
if (err != WEBP_MUX_OK) return err;
|
||
|
if (num_frames == 0) {
|
||
|
err = DeleteLoopCount(mux);
|
||
|
if (err != WEBP_MUX_OK) return err;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Create VP8X chunk.
|
||
|
err = CreateVP8XChunk(mux);
|
||
|
if (err != WEBP_MUX_OK) return err;
|
||
|
|
||
|
// Allocate data.
|
||
|
size = ChunksListDiskSize(mux->vp8x_) + ChunksListDiskSize(mux->iccp_)
|
||
|
+ ChunksListDiskSize(mux->loop_) + MuxImageListDiskSize(mux->images_)
|
||
|
+ ChunksListDiskSize(mux->meta_) + 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->loop_, dst);
|
||
|
dst = MuxImageListEmit(mux->images_, dst);
|
||
|
dst = ChunkListEmit(mux->meta_, 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.
|
||
|
assembled_data->bytes_ = data;
|
||
|
assembled_data->size_ = size;
|
||
|
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
//------------------------------------------------------------------------------
|
||
|
|
||
|
#if defined(__cplusplus) || defined(c_plusplus)
|
||
|
} // extern "C"
|
||
|
#endif
|