411 lines
13 KiB
C
411 lines
13 KiB
C
// 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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// Read 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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// Helper method(s).
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// Handy MACRO.
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#define SWITCH_ID_LIST(INDEX, LIST) \
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if (idx == (INDEX)) { \
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const WebPChunk* const chunk = ChunkSearchList((LIST), nth, \
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kChunks[(INDEX)].tag); \
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if (chunk) { \
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*data = chunk->data_; \
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return WEBP_MUX_OK; \
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} else { \
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return WEBP_MUX_NOT_FOUND; \
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} \
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}
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static WebPMuxError MuxGet(const WebPMux* const mux, CHUNK_INDEX idx,
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uint32_t nth, WebPData* const data) {
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assert(mux != NULL);
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assert(!IsWPI(kChunks[idx].id));
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WebPDataInit(data);
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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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SWITCH_ID_LIST(IDX_UNKNOWN, mux->unknown_);
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return WEBP_MUX_NOT_FOUND;
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}
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#undef SWITCH_ID_LIST
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// Fill the chunk with the given data (includes chunk header bytes), after some
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// verifications.
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static WebPMuxError ChunkVerifyAndAssignData(WebPChunk* chunk,
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const uint8_t* data,
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size_t data_size, size_t riff_size,
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int copy_data) {
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uint32_t chunk_size;
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WebPData chunk_data;
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// Sanity checks.
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if (data_size < TAG_SIZE) return WEBP_MUX_NOT_ENOUGH_DATA;
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chunk_size = GetLE32(data + TAG_SIZE);
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{
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const size_t chunk_disk_size = SizeWithPadding(chunk_size);
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if (chunk_disk_size > riff_size) return WEBP_MUX_BAD_DATA;
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if (chunk_disk_size > data_size) return WEBP_MUX_NOT_ENOUGH_DATA;
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}
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// Data assignment.
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chunk_data.bytes_ = data + CHUNK_HEADER_SIZE;
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chunk_data.size_ = chunk_size;
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return ChunkAssignData(chunk, &chunk_data, copy_data, GetLE32(data + 0));
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}
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//------------------------------------------------------------------------------
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// Create a mux object from WebP-RIFF data.
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WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
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int version) {
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size_t riff_size;
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uint32_t tag;
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const uint8_t* end;
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WebPMux* mux = NULL;
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WebPMuxImage* wpi = NULL;
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const uint8_t* data;
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size_t size;
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WebPChunk chunk;
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ChunkInit(&chunk);
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// Sanity checks.
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if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_MUX_ABI_VERSION)) {
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return NULL; // version mismatch
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}
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if (bitstream == NULL) return NULL;
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data = bitstream->bytes_;
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size = bitstream->size_;
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if (data == NULL) return NULL;
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if (size < RIFF_HEADER_SIZE) return NULL;
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if (GetLE32(data + 0) != MKFOURCC('R', 'I', 'F', 'F') ||
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GetLE32(data + CHUNK_HEADER_SIZE) != MKFOURCC('W', 'E', 'B', 'P')) {
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return NULL;
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}
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mux = WebPMuxNew();
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if (mux == NULL) return NULL;
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if (size < RIFF_HEADER_SIZE + TAG_SIZE) goto Err;
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tag = GetLE32(data + RIFF_HEADER_SIZE);
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if (tag != kChunks[IDX_VP8].tag &&
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tag != kChunks[IDX_VP8L].tag &&
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tag != kChunks[IDX_VP8X].tag) {
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goto Err; // First chunk should be VP8, VP8L or VP8X.
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}
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riff_size = SizeWithPadding(GetLE32(data + TAG_SIZE));
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if (riff_size > MAX_CHUNK_PAYLOAD || riff_size > size) {
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goto Err;
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} else {
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if (riff_size < size) { // Redundant data after last chunk.
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size = riff_size; // To make sure we don't read any data beyond mux_size.
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}
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}
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end = data + size;
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data += RIFF_HEADER_SIZE;
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size -= RIFF_HEADER_SIZE;
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wpi = (WebPMuxImage*)malloc(sizeof(*wpi));
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if (wpi == NULL) goto Err;
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MuxImageInit(wpi);
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// Loop over chunks.
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while (data != end) {
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WebPChunkId id;
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WebPMuxError err;
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err = ChunkVerifyAndAssignData(&chunk, data, size, riff_size, copy_data);
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if (err != WEBP_MUX_OK) goto Err;
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id = ChunkGetIdFromTag(chunk.tag_);
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if (IsWPI(id)) { // An image chunk (frame/tile/alpha/vp8).
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WebPChunk** wpi_chunk_ptr =
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MuxImageGetListFromId(wpi, id); // Image chunk to set.
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assert(wpi_chunk_ptr != NULL);
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if (*wpi_chunk_ptr != NULL) goto Err; // Consecutive alpha chunks or
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// consecutive frame/tile chunks.
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if (ChunkSetNth(&chunk, wpi_chunk_ptr, 1) != WEBP_MUX_OK) goto Err;
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if (id == WEBP_CHUNK_IMAGE) {
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wpi->is_partial_ = 0; // wpi is completely filled.
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// Add this to mux->images_ list.
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if (MuxImagePush(wpi, &mux->images_) != WEBP_MUX_OK) goto Err;
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MuxImageInit(wpi); // Reset for reading next image.
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} else {
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wpi->is_partial_ = 1; // wpi is only partially filled.
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}
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} else { // A non-image chunk.
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WebPChunk** chunk_list;
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if (wpi->is_partial_) goto Err; // Encountered a non-image chunk before
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// getting all chunks of an image.
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chunk_list = MuxGetChunkListFromId(mux, id); // List to add this chunk.
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if (chunk_list == NULL) chunk_list = &mux->unknown_;
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if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err;
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}
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{
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const size_t data_size = ChunkDiskSize(&chunk);
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data += data_size;
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size -= data_size;
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}
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ChunkInit(&chunk);
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}
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// Validate mux if complete.
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if (MuxValidate(mux) != WEBP_MUX_OK) goto Err;
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MuxImageDelete(wpi);
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return mux; // All OK;
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Err: // Something bad happened.
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ChunkRelease(&chunk);
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MuxImageDelete(wpi);
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WebPMuxDelete(mux);
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return NULL;
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}
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//------------------------------------------------------------------------------
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// Get API(s).
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WebPMuxError WebPMuxGetFeatures(const WebPMux* mux, uint32_t* flags) {
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WebPData data;
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WebPMuxError err;
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if (mux == NULL || flags == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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*flags = 0;
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// Check if VP8X chunk is present.
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err = MuxGet(mux, IDX_VP8X, 1, &data);
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if (err == WEBP_MUX_NOT_FOUND) {
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// Check if VP8/VP8L chunk is present.
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err = WebPMuxGetImage(mux, &data);
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WebPDataClear(&data);
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return err;
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} else if (err != WEBP_MUX_OK) {
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return err;
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}
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if (data.size_ < CHUNK_SIZE_BYTES) return WEBP_MUX_BAD_DATA;
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// All OK. Fill up flags.
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*flags = GetLE32(data.bytes_);
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return WEBP_MUX_OK;
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}
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static uint8_t* EmitVP8XChunk(uint8_t* const dst, int width,
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int height, uint32_t flags) {
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const size_t vp8x_size = CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE;
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assert(width >= 1 && height >= 1);
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assert(width <= MAX_CANVAS_SIZE && height <= MAX_CANVAS_SIZE);
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assert(width * (uint64_t)height < MAX_IMAGE_AREA);
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PutLE32(dst, MKFOURCC('V', 'P', '8', 'X'));
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PutLE32(dst + TAG_SIZE, VP8X_CHUNK_SIZE);
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PutLE32(dst + CHUNK_HEADER_SIZE, flags);
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PutLE24(dst + CHUNK_HEADER_SIZE + 4, width - 1);
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PutLE24(dst + CHUNK_HEADER_SIZE + 7, height - 1);
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return dst + vp8x_size;
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}
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// Assemble a single image WebP bitstream from 'wpi'.
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static WebPMuxError SynthesizeBitstream(WebPMuxImage* const wpi,
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WebPData* const bitstream) {
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uint8_t* dst;
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// Allocate data.
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const int need_vp8x = (wpi->alpha_ != NULL);
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const size_t vp8x_size = need_vp8x ? CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE : 0;
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const size_t alpha_size = need_vp8x ? ChunkDiskSize(wpi->alpha_) : 0;
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// Note: No need to output FRM/TILE chunk for a single image.
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const size_t size = RIFF_HEADER_SIZE + vp8x_size + alpha_size +
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ChunkDiskSize(wpi->img_);
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uint8_t* const data = (uint8_t*)malloc(size);
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if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
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// Main RIFF header.
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dst = MuxEmitRiffHeader(data, size);
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if (need_vp8x) {
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int w, h;
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WebPMuxError err;
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assert(wpi->img_ != NULL);
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err = MuxGetImageWidthHeight(wpi->img_, &w, &h);
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if (err != WEBP_MUX_OK) {
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free(data);
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return err;
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}
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dst = EmitVP8XChunk(dst, w, h, ALPHA_FLAG); // VP8X.
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dst = ChunkListEmit(wpi->alpha_, dst); // ALPH.
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}
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// Bitstream.
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dst = ChunkListEmit(wpi->img_, dst);
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assert(dst == data + size);
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// Output.
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bitstream->bytes_ = data;
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bitstream->size_ = size;
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return WEBP_MUX_OK;
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}
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WebPMuxError WebPMuxGetImage(const WebPMux* mux, WebPData* bitstream) {
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WebPMuxError err;
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WebPMuxImage* wpi = NULL;
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if (mux == NULL || bitstream == NULL) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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err = MuxValidateForImage(mux);
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if (err != WEBP_MUX_OK) return err;
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// All well. Get the image.
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err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, WEBP_CHUNK_IMAGE,
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&wpi);
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assert(err == WEBP_MUX_OK); // Already tested above.
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return SynthesizeBitstream(wpi, bitstream);
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}
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WebPMuxError WebPMuxGetMetadata(const WebPMux* mux, WebPData* metadata) {
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if (mux == NULL || metadata == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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return MuxGet(mux, IDX_META, 1, metadata);
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}
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WebPMuxError WebPMuxGetColorProfile(const WebPMux* mux,
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WebPData* color_profile) {
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if (mux == NULL || color_profile == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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return MuxGet(mux, IDX_ICCP, 1, color_profile);
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}
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WebPMuxError WebPMuxGetLoopCount(const WebPMux* mux, int* loop_count) {
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WebPData image;
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WebPMuxError err;
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if (mux == NULL || loop_count == NULL) return WEBP_MUX_INVALID_ARGUMENT;
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err = MuxGet(mux, IDX_LOOP, 1, &image);
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if (err != WEBP_MUX_OK) return err;
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if (image.size_ < kChunks[WEBP_CHUNK_LOOP].size) return WEBP_MUX_BAD_DATA;
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*loop_count = GetLE16(image.bytes_);
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return WEBP_MUX_OK;
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}
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static WebPMuxError MuxGetFrameTileInternal(
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const WebPMux* const mux, uint32_t nth, WebPData* const bitstream,
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int* const x_offset, int* const y_offset, int* const duration,
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uint32_t tag) {
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const WebPData* frame_tile_data;
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WebPMuxError err;
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WebPMuxImage* wpi;
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const int is_frame = (tag == kChunks[WEBP_CHUNK_FRAME].tag) ? 1 : 0;
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const CHUNK_INDEX idx = is_frame ? IDX_FRAME : IDX_TILE;
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const WebPChunkId id = kChunks[idx].id;
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if (mux == NULL || bitstream == NULL ||
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x_offset == NULL || y_offset == NULL || (is_frame && duration == NULL)) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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// Get the nth WebPMuxImage.
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err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, nth, id, &wpi);
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if (err != WEBP_MUX_OK) return err;
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// Get frame chunk.
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assert(wpi->header_ != NULL); // As MuxImageGetNth() already checked header_.
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frame_tile_data = &wpi->header_->data_;
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if (frame_tile_data->size_ < kChunks[idx].size) return WEBP_MUX_BAD_DATA;
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*x_offset = 2 * GetLE24(frame_tile_data->bytes_ + 0);
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*y_offset = 2 * GetLE24(frame_tile_data->bytes_ + 3);
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if (is_frame) *duration = 1 + GetLE24(frame_tile_data->bytes_ + 12);
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return SynthesizeBitstream(wpi, bitstream);
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}
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WebPMuxError WebPMuxGetFrame(const WebPMux* mux, uint32_t nth,
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WebPData* bitstream,
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int* x_offset, int* y_offset, int* duration) {
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return MuxGetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset,
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duration, kChunks[IDX_FRAME].tag);
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}
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WebPMuxError WebPMuxGetTile(const WebPMux* mux, uint32_t nth,
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WebPData* bitstream,
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int* x_offset, int* y_offset) {
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return MuxGetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset, NULL,
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kChunks[IDX_TILE].tag);
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}
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// Get chunk index from chunk id. Returns IDX_NIL if not found.
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static CHUNK_INDEX ChunkGetIndexFromId(WebPChunkId id) {
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int i;
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for (i = 0; kChunks[i].id != WEBP_CHUNK_NIL; ++i) {
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if (id == kChunks[i].id) return i;
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}
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return IDX_NIL;
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}
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// Count number of chunks matching 'tag' in the 'chunk_list'.
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// If tag == NIL_TAG, any tag will be matched.
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static int CountChunks(const WebPChunk* const chunk_list, uint32_t tag) {
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int count = 0;
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const WebPChunk* current;
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for (current = chunk_list; current != NULL; current = current->next_) {
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if (tag == NIL_TAG || current->tag_ == tag) {
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count++; // Count chunks whose tags match.
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}
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}
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return count;
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}
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WebPMuxError WebPMuxNumChunks(const WebPMux* mux,
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WebPChunkId id, int* num_elements) {
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if (mux == NULL || num_elements == NULL) {
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return WEBP_MUX_INVALID_ARGUMENT;
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}
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if (IsWPI(id)) {
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*num_elements = MuxImageCount(mux->images_, id);
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} else {
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WebPChunk* const* chunk_list = MuxGetChunkListFromId(mux, id);
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if (chunk_list == NULL) {
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*num_elements = 0;
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} else {
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const CHUNK_INDEX idx = ChunkGetIndexFromId(id);
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*num_elements = CountChunks(*chunk_list, kChunks[idx].tag);
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}
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}
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return WEBP_MUX_OK;
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}
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//------------------------------------------------------------------------------
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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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