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axmol/external/libwebp/mux/muxread.c

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// Copyright 2011 Google Inc. All Rights Reserved.
//
// This code is licensed under the same terms as WebM:
// Software License Agreement: http://www.webmproject.org/license/software/
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// Read APIs for mux.
//
// Authors: Urvang (urvang@google.com)
// Vikas (vikasa@google.com)
#include <assert.h>
#include "./muxi.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
//------------------------------------------------------------------------------
// 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_LOOP, mux->loop_);
SWITCH_ID_LIST(IDX_META, mux->meta_);
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 ChunkVerifyAndAssignData(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));
}
//------------------------------------------------------------------------------
// 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) {
WebPChunkId id;
WebPMuxError err;
err = ChunkVerifyAndAssignData(&chunk, data, size, riff_size, copy_data);
if (err != WEBP_MUX_OK) goto Err;
id = ChunkGetIdFromTag(chunk.tag_);
if (IsWPI(id)) { // An image chunk (frame/tile/alpha/vp8).
WebPChunk** wpi_chunk_ptr =
MuxImageGetListFromId(wpi, id); // Image chunk to set.
assert(wpi_chunk_ptr != NULL);
if (*wpi_chunk_ptr != NULL) goto Err; // Consecutive alpha chunks or
// consecutive frame/tile chunks.
if (ChunkSetNth(&chunk, wpi_chunk_ptr, 1) != WEBP_MUX_OK) goto Err;
if (id == WEBP_CHUNK_IMAGE) {
wpi->is_partial_ = 0; // wpi is completely filled.
// Add this to mux->images_ list.
if (MuxImagePush(wpi, &mux->images_) != WEBP_MUX_OK) goto Err;
MuxImageInit(wpi); // Reset for reading next image.
} else {
wpi->is_partial_ = 1; // wpi is only partially filled.
}
} else { // A non-image chunk.
WebPChunk** chunk_list;
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 (chunk_list == NULL) chunk_list = &mux->unknown_;
if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err;
}
{
const size_t data_size = ChunkDiskSize(&chunk);
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).
WebPMuxError WebPMuxGetFeatures(const WebPMux* mux, uint32_t* flags) {
WebPData data;
WebPMuxError err;
if (mux == NULL || flags == NULL) return WEBP_MUX_INVALID_ARGUMENT;
*flags = 0;
// Check if VP8X chunk is present.
err = MuxGet(mux, IDX_VP8X, 1, &data);
if (err == WEBP_MUX_NOT_FOUND) {
// Check if VP8/VP8L chunk is present.
err = WebPMuxGetImage(mux, &data);
WebPDataClear(&data);
return err;
} else if (err != WEBP_MUX_OK) {
return err;
}
if (data.size_ < CHUNK_SIZE_BYTES) return WEBP_MUX_BAD_DATA;
// All OK. Fill up flags.
*flags = GetLE32(data.bytes_);
return WEBP_MUX_OK;
}
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(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 FRM/TILE 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) {
int w, h;
WebPMuxError err;
assert(wpi->img_ != NULL);
err = MuxGetImageWidthHeight(wpi->img_, &w, &h);
if (err != WEBP_MUX_OK) {
free(data);
return err;
}
dst = EmitVP8XChunk(dst, w, h, 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 WebPMuxGetImage(const WebPMux* mux, WebPData* bitstream) {
WebPMuxError err;
WebPMuxImage* wpi = NULL;
if (mux == NULL || bitstream == NULL) {
return WEBP_MUX_INVALID_ARGUMENT;
}
err = MuxValidateForImage(mux);
if (err != WEBP_MUX_OK) return err;
// All well. Get the image.
err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, 1, WEBP_CHUNK_IMAGE,
&wpi);
assert(err == WEBP_MUX_OK); // Already tested above.
return SynthesizeBitstream(wpi, bitstream);
}
WebPMuxError WebPMuxGetMetadata(const WebPMux* mux, WebPData* metadata) {
if (mux == NULL || metadata == NULL) return WEBP_MUX_INVALID_ARGUMENT;
return MuxGet(mux, IDX_META, 1, metadata);
}
WebPMuxError WebPMuxGetColorProfile(const WebPMux* mux,
WebPData* color_profile) {
if (mux == NULL || color_profile == NULL) return WEBP_MUX_INVALID_ARGUMENT;
return MuxGet(mux, IDX_ICCP, 1, color_profile);
}
WebPMuxError WebPMuxGetLoopCount(const WebPMux* mux, int* loop_count) {
WebPData image;
WebPMuxError err;
if (mux == NULL || loop_count == NULL) return WEBP_MUX_INVALID_ARGUMENT;
err = MuxGet(mux, IDX_LOOP, 1, &image);
if (err != WEBP_MUX_OK) return err;
if (image.size_ < kChunks[WEBP_CHUNK_LOOP].size) return WEBP_MUX_BAD_DATA;
*loop_count = GetLE16(image.bytes_);
return WEBP_MUX_OK;
}
static WebPMuxError MuxGetFrameTileInternal(
const WebPMux* const mux, uint32_t nth, WebPData* const bitstream,
int* const x_offset, int* const y_offset, int* const duration,
uint32_t tag) {
const WebPData* frame_tile_data;
WebPMuxError err;
WebPMuxImage* wpi;
const int is_frame = (tag == kChunks[WEBP_CHUNK_FRAME].tag) ? 1 : 0;
const CHUNK_INDEX idx = is_frame ? IDX_FRAME : IDX_TILE;
const WebPChunkId id = kChunks[idx].id;
if (mux == NULL || bitstream == NULL ||
x_offset == NULL || y_offset == NULL || (is_frame && duration == NULL)) {
return WEBP_MUX_INVALID_ARGUMENT;
}
// Get the nth WebPMuxImage.
err = MuxImageGetNth((const WebPMuxImage**)&mux->images_, nth, id, &wpi);
if (err != WEBP_MUX_OK) return err;
// Get frame chunk.
assert(wpi->header_ != NULL); // As MuxImageGetNth() already checked header_.
frame_tile_data = &wpi->header_->data_;
if (frame_tile_data->size_ < kChunks[idx].size) return WEBP_MUX_BAD_DATA;
*x_offset = 2 * GetLE24(frame_tile_data->bytes_ + 0);
*y_offset = 2 * GetLE24(frame_tile_data->bytes_ + 3);
if (is_frame) *duration = 1 + GetLE24(frame_tile_data->bytes_ + 12);
return SynthesizeBitstream(wpi, bitstream);
}
WebPMuxError WebPMuxGetFrame(const WebPMux* mux, uint32_t nth,
WebPData* bitstream,
int* x_offset, int* y_offset, int* duration) {
return MuxGetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset,
duration, kChunks[IDX_FRAME].tag);
}
WebPMuxError WebPMuxGetTile(const WebPMux* mux, uint32_t nth,
WebPData* bitstream,
int* x_offset, int* y_offset) {
return MuxGetFrameTileInternal(mux, nth, bitstream, x_offset, y_offset, NULL,
kChunks[IDX_TILE].tag);
}
// 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 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);
if (chunk_list == NULL) {
*num_elements = 0;
} else {
const CHUNK_INDEX idx = ChunkGetIndexFromId(id);
*num_elements = CountChunks(*chunk_list, kChunks[idx].tag);
}
}
return WEBP_MUX_OK;
}
//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
#endif
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