diff options
Diffstat (limited to 'drivers/webp/dec/idec.c')
| -rw-r--r-- | drivers/webp/dec/idec.c | 892 |
1 files changed, 0 insertions, 892 deletions
diff --git a/drivers/webp/dec/idec.c b/drivers/webp/dec/idec.c deleted file mode 100644 index 8de131916e..0000000000 --- a/drivers/webp/dec/idec.c +++ /dev/null @@ -1,892 +0,0 @@ -// 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. -// ----------------------------------------------------------------------------- -// -// Incremental decoding -// -// Author: somnath@google.com (Somnath Banerjee) - -#include <assert.h> -#include <string.h> -#include <stdlib.h> - -#include "./alphai.h" -#include "./webpi.h" -#include "./vp8i.h" -#include "../utils/utils.h" - -// In append mode, buffer allocations increase as multiples of this value. -// Needs to be a power of 2. -#define CHUNK_SIZE 4096 -#define MAX_MB_SIZE 4096 - -//------------------------------------------------------------------------------ -// Data structures for memory and states - -// Decoding states. State normally flows as: -// WEBP_HEADER->VP8_HEADER->VP8_PARTS0->VP8_DATA->DONE for a lossy image, and -// WEBP_HEADER->VP8L_HEADER->VP8L_DATA->DONE for a lossless image. -// If there is any error the decoder goes into state ERROR. -typedef enum { - STATE_WEBP_HEADER, // All the data before that of the VP8/VP8L chunk. - STATE_VP8_HEADER, // The VP8 Frame header (within the VP8 chunk). - STATE_VP8_PARTS0, - STATE_VP8_DATA, - STATE_VP8L_HEADER, - STATE_VP8L_DATA, - STATE_DONE, - STATE_ERROR -} DecState; - -// Operating state for the MemBuffer -typedef enum { - MEM_MODE_NONE = 0, - MEM_MODE_APPEND, - MEM_MODE_MAP -} MemBufferMode; - -// storage for partition #0 and partial data (in a rolling fashion) -typedef struct { - MemBufferMode mode_; // Operation mode - size_t start_; // start location of the data to be decoded - size_t end_; // end location - size_t buf_size_; // size of the allocated buffer - uint8_t* buf_; // We don't own this buffer in case WebPIUpdate() - - size_t part0_size_; // size of partition #0 - const uint8_t* part0_buf_; // buffer to store partition #0 -} MemBuffer; - -struct WebPIDecoder { - DecState state_; // current decoding state - WebPDecParams params_; // Params to store output info - int is_lossless_; // for down-casting 'dec_'. - void* dec_; // either a VP8Decoder or a VP8LDecoder instance - VP8Io io_; - - MemBuffer mem_; // input memory buffer. - WebPDecBuffer output_; // output buffer (when no external one is supplied, - // or if the external one has slow-memory) - WebPDecBuffer* final_output_; // Slow-memory output to copy to eventually. - size_t chunk_size_; // Compressed VP8/VP8L size extracted from Header. - - int last_mb_y_; // last row reached for intra-mode decoding -}; - -// MB context to restore in case VP8DecodeMB() fails -typedef struct { - VP8MB left_; - VP8MB info_; - VP8BitReader token_br_; -} MBContext; - -//------------------------------------------------------------------------------ -// MemBuffer: incoming data handling - -static WEBP_INLINE size_t MemDataSize(const MemBuffer* mem) { - return (mem->end_ - mem->start_); -} - -// Check if we need to preserve the compressed alpha data, as it may not have -// been decoded yet. -static int NeedCompressedAlpha(const WebPIDecoder* const idec) { - if (idec->state_ == STATE_WEBP_HEADER) { - // We haven't parsed the headers yet, so we don't know whether the image is - // lossy or lossless. This also means that we haven't parsed the ALPH chunk. - return 0; - } - if (idec->is_lossless_) { - return 0; // ALPH chunk is not present for lossless images. - } else { - const VP8Decoder* const dec = (VP8Decoder*)idec->dec_; - assert(dec != NULL); // Must be true as idec->state_ != STATE_WEBP_HEADER. - return (dec->alpha_data_ != NULL) && !dec->is_alpha_decoded_; - } -} - -static void DoRemap(WebPIDecoder* const idec, ptrdiff_t offset) { - MemBuffer* const mem = &idec->mem_; - const uint8_t* const new_base = mem->buf_ + mem->start_; - // note: for VP8, setting up idec->io_ is only really needed at the beginning - // of the decoding, till partition #0 is complete. - idec->io_.data = new_base; - idec->io_.data_size = MemDataSize(mem); - - if (idec->dec_ != NULL) { - if (!idec->is_lossless_) { - VP8Decoder* const dec = (VP8Decoder*)idec->dec_; - const uint32_t last_part = dec->num_parts_minus_one_; - if (offset != 0) { - uint32_t p; - for (p = 0; p <= last_part; ++p) { - VP8RemapBitReader(dec->parts_ + p, offset); - } - // Remap partition #0 data pointer to new offset, but only in MAP - // mode (in APPEND mode, partition #0 is copied into a fixed memory). - if (mem->mode_ == MEM_MODE_MAP) { - VP8RemapBitReader(&dec->br_, offset); - } - } - { - const uint8_t* const last_start = dec->parts_[last_part].buf_; - VP8BitReaderSetBuffer(&dec->parts_[last_part], last_start, - mem->buf_ + mem->end_ - last_start); - } - if (NeedCompressedAlpha(idec)) { - ALPHDecoder* const alph_dec = dec->alph_dec_; - dec->alpha_data_ += offset; - if (alph_dec != NULL) { - if (alph_dec->method_ == ALPHA_LOSSLESS_COMPRESSION) { - VP8LDecoder* const alph_vp8l_dec = alph_dec->vp8l_dec_; - assert(alph_vp8l_dec != NULL); - assert(dec->alpha_data_size_ >= ALPHA_HEADER_LEN); - VP8LBitReaderSetBuffer(&alph_vp8l_dec->br_, - dec->alpha_data_ + ALPHA_HEADER_LEN, - dec->alpha_data_size_ - ALPHA_HEADER_LEN); - } else { // alph_dec->method_ == ALPHA_NO_COMPRESSION - // Nothing special to do in this case. - } - } - } - } else { // Resize lossless bitreader - VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; - VP8LBitReaderSetBuffer(&dec->br_, new_base, MemDataSize(mem)); - } - } -} - -// Appends data to the end of MemBuffer->buf_. It expands the allocated memory -// size if required and also updates VP8BitReader's if new memory is allocated. -static int AppendToMemBuffer(WebPIDecoder* const idec, - const uint8_t* const data, size_t data_size) { - VP8Decoder* const dec = (VP8Decoder*)idec->dec_; - MemBuffer* const mem = &idec->mem_; - const int need_compressed_alpha = NeedCompressedAlpha(idec); - const uint8_t* const old_start = mem->buf_ + mem->start_; - const uint8_t* const old_base = - need_compressed_alpha ? dec->alpha_data_ : old_start; - assert(mem->mode_ == MEM_MODE_APPEND); - if (data_size > MAX_CHUNK_PAYLOAD) { - // security safeguard: trying to allocate more than what the format - // allows for a chunk should be considered a smoke smell. - return 0; - } - - if (mem->end_ + data_size > mem->buf_size_) { // Need some free memory - const size_t new_mem_start = old_start - old_base; - const size_t current_size = MemDataSize(mem) + new_mem_start; - const uint64_t new_size = (uint64_t)current_size + data_size; - const uint64_t extra_size = (new_size + CHUNK_SIZE - 1) & ~(CHUNK_SIZE - 1); - uint8_t* const new_buf = - (uint8_t*)WebPSafeMalloc(extra_size, sizeof(*new_buf)); - if (new_buf == NULL) return 0; - memcpy(new_buf, old_base, current_size); - WebPSafeFree(mem->buf_); - mem->buf_ = new_buf; - mem->buf_size_ = (size_t)extra_size; - mem->start_ = new_mem_start; - mem->end_ = current_size; - } - - memcpy(mem->buf_ + mem->end_, data, data_size); - mem->end_ += data_size; - assert(mem->end_ <= mem->buf_size_); - - DoRemap(idec, mem->buf_ + mem->start_ - old_start); - return 1; -} - -static int RemapMemBuffer(WebPIDecoder* const idec, - const uint8_t* const data, size_t data_size) { - MemBuffer* const mem = &idec->mem_; - const uint8_t* const old_buf = mem->buf_; - const uint8_t* const old_start = old_buf + mem->start_; - assert(mem->mode_ == MEM_MODE_MAP); - - if (data_size < mem->buf_size_) return 0; // can't remap to a shorter buffer! - - mem->buf_ = (uint8_t*)data; - mem->end_ = mem->buf_size_ = data_size; - - DoRemap(idec, mem->buf_ + mem->start_ - old_start); - return 1; -} - -static void InitMemBuffer(MemBuffer* const mem) { - mem->mode_ = MEM_MODE_NONE; - mem->buf_ = NULL; - mem->buf_size_ = 0; - mem->part0_buf_ = NULL; - mem->part0_size_ = 0; -} - -static void ClearMemBuffer(MemBuffer* const mem) { - assert(mem); - if (mem->mode_ == MEM_MODE_APPEND) { - WebPSafeFree(mem->buf_); - WebPSafeFree((void*)mem->part0_buf_); - } -} - -static int CheckMemBufferMode(MemBuffer* const mem, MemBufferMode expected) { - if (mem->mode_ == MEM_MODE_NONE) { - mem->mode_ = expected; // switch to the expected mode - } else if (mem->mode_ != expected) { - return 0; // we mixed the modes => error - } - assert(mem->mode_ == expected); // mode is ok - return 1; -} - -// To be called last. -static VP8StatusCode FinishDecoding(WebPIDecoder* const idec) { - const WebPDecoderOptions* const options = idec->params_.options; - WebPDecBuffer* const output = idec->params_.output; - - idec->state_ = STATE_DONE; - if (options != NULL && options->flip) { - const VP8StatusCode status = WebPFlipBuffer(output); - if (status != VP8_STATUS_OK) return status; - } - if (idec->final_output_ != NULL) { - WebPCopyDecBufferPixels(output, idec->final_output_); // do the slow-copy - WebPFreeDecBuffer(&idec->output_); - *output = *idec->final_output_; - idec->final_output_ = NULL; - } - return VP8_STATUS_OK; -} - -//------------------------------------------------------------------------------ -// Macroblock-decoding contexts - -static void SaveContext(const VP8Decoder* dec, const VP8BitReader* token_br, - MBContext* const context) { - context->left_ = dec->mb_info_[-1]; - context->info_ = dec->mb_info_[dec->mb_x_]; - context->token_br_ = *token_br; -} - -static void RestoreContext(const MBContext* context, VP8Decoder* const dec, - VP8BitReader* const token_br) { - dec->mb_info_[-1] = context->left_; - dec->mb_info_[dec->mb_x_] = context->info_; - *token_br = context->token_br_; -} - -//------------------------------------------------------------------------------ - -static VP8StatusCode IDecError(WebPIDecoder* const idec, VP8StatusCode error) { - if (idec->state_ == STATE_VP8_DATA) { - VP8Io* const io = &idec->io_; - if (io->teardown != NULL) { - io->teardown(io); - } - } - idec->state_ = STATE_ERROR; - return error; -} - -static void ChangeState(WebPIDecoder* const idec, DecState new_state, - size_t consumed_bytes) { - MemBuffer* const mem = &idec->mem_; - idec->state_ = new_state; - mem->start_ += consumed_bytes; - assert(mem->start_ <= mem->end_); - idec->io_.data = mem->buf_ + mem->start_; - idec->io_.data_size = MemDataSize(mem); -} - -// Headers -static VP8StatusCode DecodeWebPHeaders(WebPIDecoder* const idec) { - MemBuffer* const mem = &idec->mem_; - const uint8_t* data = mem->buf_ + mem->start_; - size_t curr_size = MemDataSize(mem); - VP8StatusCode status; - WebPHeaderStructure headers; - - headers.data = data; - headers.data_size = curr_size; - headers.have_all_data = 0; - status = WebPParseHeaders(&headers); - if (status == VP8_STATUS_NOT_ENOUGH_DATA) { - return VP8_STATUS_SUSPENDED; // We haven't found a VP8 chunk yet. - } else if (status != VP8_STATUS_OK) { - return IDecError(idec, status); - } - - idec->chunk_size_ = headers.compressed_size; - idec->is_lossless_ = headers.is_lossless; - if (!idec->is_lossless_) { - VP8Decoder* const dec = VP8New(); - if (dec == NULL) { - return VP8_STATUS_OUT_OF_MEMORY; - } - idec->dec_ = dec; - dec->alpha_data_ = headers.alpha_data; - dec->alpha_data_size_ = headers.alpha_data_size; - ChangeState(idec, STATE_VP8_HEADER, headers.offset); - } else { - VP8LDecoder* const dec = VP8LNew(); - if (dec == NULL) { - return VP8_STATUS_OUT_OF_MEMORY; - } - idec->dec_ = dec; - ChangeState(idec, STATE_VP8L_HEADER, headers.offset); - } - return VP8_STATUS_OK; -} - -static VP8StatusCode DecodeVP8FrameHeader(WebPIDecoder* const idec) { - const uint8_t* data = idec->mem_.buf_ + idec->mem_.start_; - const size_t curr_size = MemDataSize(&idec->mem_); - int width, height; - uint32_t bits; - - if (curr_size < VP8_FRAME_HEADER_SIZE) { - // Not enough data bytes to extract VP8 Frame Header. - return VP8_STATUS_SUSPENDED; - } - if (!VP8GetInfo(data, curr_size, idec->chunk_size_, &width, &height)) { - return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); - } - - bits = data[0] | (data[1] << 8) | (data[2] << 16); - idec->mem_.part0_size_ = (bits >> 5) + VP8_FRAME_HEADER_SIZE; - - idec->io_.data = data; - idec->io_.data_size = curr_size; - idec->state_ = STATE_VP8_PARTS0; - return VP8_STATUS_OK; -} - -// Partition #0 -static VP8StatusCode CopyParts0Data(WebPIDecoder* const idec) { - VP8Decoder* const dec = (VP8Decoder*)idec->dec_; - VP8BitReader* const br = &dec->br_; - const size_t part_size = br->buf_end_ - br->buf_; - MemBuffer* const mem = &idec->mem_; - assert(!idec->is_lossless_); - assert(mem->part0_buf_ == NULL); - // the following is a format limitation, no need for runtime check: - assert(part_size <= mem->part0_size_); - if (part_size == 0) { // can't have zero-size partition #0 - return VP8_STATUS_BITSTREAM_ERROR; - } - if (mem->mode_ == MEM_MODE_APPEND) { - // We copy and grab ownership of the partition #0 data. - uint8_t* const part0_buf = (uint8_t*)WebPSafeMalloc(1ULL, part_size); - if (part0_buf == NULL) { - return VP8_STATUS_OUT_OF_MEMORY; - } - memcpy(part0_buf, br->buf_, part_size); - mem->part0_buf_ = part0_buf; - VP8BitReaderSetBuffer(br, part0_buf, part_size); - } else { - // Else: just keep pointers to the partition #0's data in dec_->br_. - } - mem->start_ += part_size; - return VP8_STATUS_OK; -} - -static VP8StatusCode DecodePartition0(WebPIDecoder* const idec) { - VP8Decoder* const dec = (VP8Decoder*)idec->dec_; - VP8Io* const io = &idec->io_; - const WebPDecParams* const params = &idec->params_; - WebPDecBuffer* const output = params->output; - - // Wait till we have enough data for the whole partition #0 - if (MemDataSize(&idec->mem_) < idec->mem_.part0_size_) { - return VP8_STATUS_SUSPENDED; - } - - if (!VP8GetHeaders(dec, io)) { - const VP8StatusCode status = dec->status_; - if (status == VP8_STATUS_SUSPENDED || - status == VP8_STATUS_NOT_ENOUGH_DATA) { - // treating NOT_ENOUGH_DATA as SUSPENDED state - return VP8_STATUS_SUSPENDED; - } - return IDecError(idec, status); - } - - // Allocate/Verify output buffer now - dec->status_ = WebPAllocateDecBuffer(io->width, io->height, params->options, - output); - if (dec->status_ != VP8_STATUS_OK) { - return IDecError(idec, dec->status_); - } - // This change must be done before calling VP8InitFrame() - dec->mt_method_ = VP8GetThreadMethod(params->options, NULL, - io->width, io->height); - VP8InitDithering(params->options, dec); - - dec->status_ = CopyParts0Data(idec); - if (dec->status_ != VP8_STATUS_OK) { - return IDecError(idec, dec->status_); - } - - // Finish setting up the decoding parameters. Will call io->setup(). - if (VP8EnterCritical(dec, io) != VP8_STATUS_OK) { - return IDecError(idec, dec->status_); - } - - // Note: past this point, teardown() must always be called - // in case of error. - idec->state_ = STATE_VP8_DATA; - // Allocate memory and prepare everything. - if (!VP8InitFrame(dec, io)) { - return IDecError(idec, dec->status_); - } - return VP8_STATUS_OK; -} - -// Remaining partitions -static VP8StatusCode DecodeRemaining(WebPIDecoder* const idec) { - VP8Decoder* const dec = (VP8Decoder*)idec->dec_; - VP8Io* const io = &idec->io_; - - assert(dec->ready_); - for (; dec->mb_y_ < dec->mb_h_; ++dec->mb_y_) { - if (idec->last_mb_y_ != dec->mb_y_) { - if (!VP8ParseIntraModeRow(&dec->br_, dec)) { - // note: normally, error shouldn't occur since we already have the whole - // partition0 available here in DecodeRemaining(). Reaching EOF while - // reading intra modes really means a BITSTREAM_ERROR. - return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); - } - idec->last_mb_y_ = dec->mb_y_; - } - for (; dec->mb_x_ < dec->mb_w_; ++dec->mb_x_) { - VP8BitReader* const token_br = - &dec->parts_[dec->mb_y_ & dec->num_parts_minus_one_]; - MBContext context; - SaveContext(dec, token_br, &context); - if (!VP8DecodeMB(dec, token_br)) { - // We shouldn't fail when MAX_MB data was available - if (dec->num_parts_minus_one_ == 0 && - MemDataSize(&idec->mem_) > MAX_MB_SIZE) { - return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); - } - RestoreContext(&context, dec, token_br); - return VP8_STATUS_SUSPENDED; - } - // Release buffer only if there is only one partition - if (dec->num_parts_minus_one_ == 0) { - idec->mem_.start_ = token_br->buf_ - idec->mem_.buf_; - assert(idec->mem_.start_ <= idec->mem_.end_); - } - } - VP8InitScanline(dec); // Prepare for next scanline - - // Reconstruct, filter and emit the row. - if (!VP8ProcessRow(dec, io)) { - return IDecError(idec, VP8_STATUS_USER_ABORT); - } - } - // Synchronize the thread and check for errors. - if (!VP8ExitCritical(dec, io)) { - return IDecError(idec, VP8_STATUS_USER_ABORT); - } - dec->ready_ = 0; - return FinishDecoding(idec); -} - -static VP8StatusCode ErrorStatusLossless(WebPIDecoder* const idec, - VP8StatusCode status) { - if (status == VP8_STATUS_SUSPENDED || status == VP8_STATUS_NOT_ENOUGH_DATA) { - return VP8_STATUS_SUSPENDED; - } - return IDecError(idec, status); -} - -static VP8StatusCode DecodeVP8LHeader(WebPIDecoder* const idec) { - VP8Io* const io = &idec->io_; - VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; - const WebPDecParams* const params = &idec->params_; - WebPDecBuffer* const output = params->output; - size_t curr_size = MemDataSize(&idec->mem_); - assert(idec->is_lossless_); - - // Wait until there's enough data for decoding header. - if (curr_size < (idec->chunk_size_ >> 3)) { - dec->status_ = VP8_STATUS_SUSPENDED; - return ErrorStatusLossless(idec, dec->status_); - } - - if (!VP8LDecodeHeader(dec, io)) { - if (dec->status_ == VP8_STATUS_BITSTREAM_ERROR && - curr_size < idec->chunk_size_) { - dec->status_ = VP8_STATUS_SUSPENDED; - } - return ErrorStatusLossless(idec, dec->status_); - } - // Allocate/verify output buffer now. - dec->status_ = WebPAllocateDecBuffer(io->width, io->height, params->options, - output); - if (dec->status_ != VP8_STATUS_OK) { - return IDecError(idec, dec->status_); - } - - idec->state_ = STATE_VP8L_DATA; - return VP8_STATUS_OK; -} - -static VP8StatusCode DecodeVP8LData(WebPIDecoder* const idec) { - VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; - const size_t curr_size = MemDataSize(&idec->mem_); - assert(idec->is_lossless_); - - // Switch to incremental decoding if we don't have all the bytes available. - dec->incremental_ = (curr_size < idec->chunk_size_); - - if (!VP8LDecodeImage(dec)) { - return ErrorStatusLossless(idec, dec->status_); - } - assert(dec->status_ == VP8_STATUS_OK || dec->status_ == VP8_STATUS_SUSPENDED); - return (dec->status_ == VP8_STATUS_SUSPENDED) ? dec->status_ - : FinishDecoding(idec); -} - - // Main decoding loop -static VP8StatusCode IDecode(WebPIDecoder* idec) { - VP8StatusCode status = VP8_STATUS_SUSPENDED; - - if (idec->state_ == STATE_WEBP_HEADER) { - status = DecodeWebPHeaders(idec); - } else { - if (idec->dec_ == NULL) { - return VP8_STATUS_SUSPENDED; // can't continue if we have no decoder. - } - } - if (idec->state_ == STATE_VP8_HEADER) { - status = DecodeVP8FrameHeader(idec); - } - if (idec->state_ == STATE_VP8_PARTS0) { - status = DecodePartition0(idec); - } - if (idec->state_ == STATE_VP8_DATA) { - status = DecodeRemaining(idec); - } - if (idec->state_ == STATE_VP8L_HEADER) { - status = DecodeVP8LHeader(idec); - } - if (idec->state_ == STATE_VP8L_DATA) { - status = DecodeVP8LData(idec); - } - return status; -} - -//------------------------------------------------------------------------------ -// Internal constructor - -static WebPIDecoder* NewDecoder(WebPDecBuffer* const output_buffer, - const WebPBitstreamFeatures* const features) { - WebPIDecoder* idec = (WebPIDecoder*)WebPSafeCalloc(1ULL, sizeof(*idec)); - if (idec == NULL) { - return NULL; - } - - idec->state_ = STATE_WEBP_HEADER; - idec->chunk_size_ = 0; - - idec->last_mb_y_ = -1; - - InitMemBuffer(&idec->mem_); - WebPInitDecBuffer(&idec->output_); - VP8InitIo(&idec->io_); - - WebPResetDecParams(&idec->params_); - if (output_buffer == NULL || WebPAvoidSlowMemory(output_buffer, features)) { - idec->params_.output = &idec->output_; - idec->final_output_ = output_buffer; - if (output_buffer != NULL) { - idec->params_.output->colorspace = output_buffer->colorspace; - } - } else { - idec->params_.output = output_buffer; - idec->final_output_ = NULL; - } - WebPInitCustomIo(&idec->params_, &idec->io_); // Plug the I/O functions. - - return idec; -} - -//------------------------------------------------------------------------------ -// Public functions - -WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer) { - return NewDecoder(output_buffer, NULL); -} - -WebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size, - WebPDecoderConfig* config) { - WebPIDecoder* idec; - WebPBitstreamFeatures tmp_features; - WebPBitstreamFeatures* const features = - (config == NULL) ? &tmp_features : &config->input; - memset(&tmp_features, 0, sizeof(tmp_features)); - - // Parse the bitstream's features, if requested: - if (data != NULL && data_size > 0) { - if (WebPGetFeatures(data, data_size, features) != VP8_STATUS_OK) { - return NULL; - } - } - - // Create an instance of the incremental decoder - idec = (config != NULL) ? NewDecoder(&config->output, features) - : NewDecoder(NULL, features); - if (idec == NULL) { - return NULL; - } - // Finish initialization - if (config != NULL) { - idec->params_.options = &config->options; - } - return idec; -} - -void WebPIDelete(WebPIDecoder* idec) { - if (idec == NULL) return; - if (idec->dec_ != NULL) { - if (!idec->is_lossless_) { - if (idec->state_ == STATE_VP8_DATA) { - // Synchronize the thread, clean-up and check for errors. - VP8ExitCritical((VP8Decoder*)idec->dec_, &idec->io_); - } - VP8Delete((VP8Decoder*)idec->dec_); - } else { - VP8LDelete((VP8LDecoder*)idec->dec_); - } - } - ClearMemBuffer(&idec->mem_); - WebPFreeDecBuffer(&idec->output_); - WebPSafeFree(idec); -} - -//------------------------------------------------------------------------------ -// Wrapper toward WebPINewDecoder - -WebPIDecoder* WebPINewRGB(WEBP_CSP_MODE mode, uint8_t* output_buffer, - size_t output_buffer_size, int output_stride) { - const int is_external_memory = (output_buffer != NULL) ? 1 : 0; - WebPIDecoder* idec; - - if (mode >= MODE_YUV) return NULL; - if (is_external_memory == 0) { // Overwrite parameters to sane values. - output_buffer_size = 0; - output_stride = 0; - } else { // A buffer was passed. Validate the other params. - if (output_stride == 0 || output_buffer_size == 0) { - return NULL; // invalid parameter. - } - } - idec = WebPINewDecoder(NULL); - if (idec == NULL) return NULL; - idec->output_.colorspace = mode; - idec->output_.is_external_memory = is_external_memory; - idec->output_.u.RGBA.rgba = output_buffer; - idec->output_.u.RGBA.stride = output_stride; - idec->output_.u.RGBA.size = output_buffer_size; - return idec; -} - -WebPIDecoder* WebPINewYUVA(uint8_t* luma, size_t luma_size, int luma_stride, - uint8_t* u, size_t u_size, int u_stride, - uint8_t* v, size_t v_size, int v_stride, - uint8_t* a, size_t a_size, int a_stride) { - const int is_external_memory = (luma != NULL) ? 1 : 0; - WebPIDecoder* idec; - WEBP_CSP_MODE colorspace; - - if (is_external_memory == 0) { // Overwrite parameters to sane values. - luma_size = u_size = v_size = a_size = 0; - luma_stride = u_stride = v_stride = a_stride = 0; - u = v = a = NULL; - colorspace = MODE_YUVA; - } else { // A luma buffer was passed. Validate the other parameters. - if (u == NULL || v == NULL) return NULL; - if (luma_size == 0 || u_size == 0 || v_size == 0) return NULL; - if (luma_stride == 0 || u_stride == 0 || v_stride == 0) return NULL; - if (a != NULL) { - if (a_size == 0 || a_stride == 0) return NULL; - } - colorspace = (a == NULL) ? MODE_YUV : MODE_YUVA; - } - - idec = WebPINewDecoder(NULL); - if (idec == NULL) return NULL; - - idec->output_.colorspace = colorspace; - idec->output_.is_external_memory = is_external_memory; - idec->output_.u.YUVA.y = luma; - idec->output_.u.YUVA.y_stride = luma_stride; - idec->output_.u.YUVA.y_size = luma_size; - idec->output_.u.YUVA.u = u; - idec->output_.u.YUVA.u_stride = u_stride; - idec->output_.u.YUVA.u_size = u_size; - idec->output_.u.YUVA.v = v; - idec->output_.u.YUVA.v_stride = v_stride; - idec->output_.u.YUVA.v_size = v_size; - idec->output_.u.YUVA.a = a; - idec->output_.u.YUVA.a_stride = a_stride; - idec->output_.u.YUVA.a_size = a_size; - return idec; -} - -WebPIDecoder* WebPINewYUV(uint8_t* luma, size_t luma_size, int luma_stride, - uint8_t* u, size_t u_size, int u_stride, - uint8_t* v, size_t v_size, int v_stride) { - return WebPINewYUVA(luma, luma_size, luma_stride, - u, u_size, u_stride, - v, v_size, v_stride, - NULL, 0, 0); -} - -//------------------------------------------------------------------------------ - -static VP8StatusCode IDecCheckStatus(const WebPIDecoder* const idec) { - assert(idec); - if (idec->state_ == STATE_ERROR) { - return VP8_STATUS_BITSTREAM_ERROR; - } - if (idec->state_ == STATE_DONE) { - return VP8_STATUS_OK; - } - return VP8_STATUS_SUSPENDED; -} - -VP8StatusCode WebPIAppend(WebPIDecoder* idec, - const uint8_t* data, size_t data_size) { - VP8StatusCode status; - if (idec == NULL || data == NULL) { - return VP8_STATUS_INVALID_PARAM; - } - status = IDecCheckStatus(idec); - if (status != VP8_STATUS_SUSPENDED) { - return status; - } - // Check mixed calls between RemapMemBuffer and AppendToMemBuffer. - if (!CheckMemBufferMode(&idec->mem_, MEM_MODE_APPEND)) { - return VP8_STATUS_INVALID_PARAM; - } - // Append data to memory buffer - if (!AppendToMemBuffer(idec, data, data_size)) { - return VP8_STATUS_OUT_OF_MEMORY; - } - return IDecode(idec); -} - -VP8StatusCode WebPIUpdate(WebPIDecoder* idec, - const uint8_t* data, size_t data_size) { - VP8StatusCode status; - if (idec == NULL || data == NULL) { - return VP8_STATUS_INVALID_PARAM; - } - status = IDecCheckStatus(idec); - if (status != VP8_STATUS_SUSPENDED) { - return status; - } - // Check mixed calls between RemapMemBuffer and AppendToMemBuffer. - if (!CheckMemBufferMode(&idec->mem_, MEM_MODE_MAP)) { - return VP8_STATUS_INVALID_PARAM; - } - // Make the memory buffer point to the new buffer - if (!RemapMemBuffer(idec, data, data_size)) { - return VP8_STATUS_INVALID_PARAM; - } - return IDecode(idec); -} - -//------------------------------------------------------------------------------ - -static const WebPDecBuffer* GetOutputBuffer(const WebPIDecoder* const idec) { - if (idec == NULL || idec->dec_ == NULL) { - return NULL; - } - if (idec->state_ <= STATE_VP8_PARTS0) { - return NULL; - } - if (idec->final_output_ != NULL) { - return NULL; // not yet slow-copied - } - return idec->params_.output; -} - -const WebPDecBuffer* WebPIDecodedArea(const WebPIDecoder* idec, - int* left, int* top, - int* width, int* height) { - const WebPDecBuffer* const src = GetOutputBuffer(idec); - if (left != NULL) *left = 0; - if (top != NULL) *top = 0; - if (src != NULL) { - if (width != NULL) *width = src->width; - if (height != NULL) *height = idec->params_.last_y; - } else { - if (width != NULL) *width = 0; - if (height != NULL) *height = 0; - } - return src; -} - -uint8_t* WebPIDecGetRGB(const WebPIDecoder* idec, int* last_y, - int* width, int* height, int* stride) { - const WebPDecBuffer* const src = GetOutputBuffer(idec); - if (src == NULL) return NULL; - if (src->colorspace >= MODE_YUV) { - return NULL; - } - - if (last_y != NULL) *last_y = idec->params_.last_y; - if (width != NULL) *width = src->width; - if (height != NULL) *height = src->height; - if (stride != NULL) *stride = src->u.RGBA.stride; - - return src->u.RGBA.rgba; -} - -uint8_t* WebPIDecGetYUVA(const WebPIDecoder* idec, int* last_y, - uint8_t** u, uint8_t** v, uint8_t** a, - int* width, int* height, - int* stride, int* uv_stride, int* a_stride) { - const WebPDecBuffer* const src = GetOutputBuffer(idec); - if (src == NULL) return NULL; - if (src->colorspace < MODE_YUV) { - return NULL; - } - - if (last_y != NULL) *last_y = idec->params_.last_y; - if (u != NULL) *u = src->u.YUVA.u; - if (v != NULL) *v = src->u.YUVA.v; - if (a != NULL) *a = src->u.YUVA.a; - if (width != NULL) *width = src->width; - if (height != NULL) *height = src->height; - if (stride != NULL) *stride = src->u.YUVA.y_stride; - if (uv_stride != NULL) *uv_stride = src->u.YUVA.u_stride; - if (a_stride != NULL) *a_stride = src->u.YUVA.a_stride; - - return src->u.YUVA.y; -} - -int WebPISetIOHooks(WebPIDecoder* const idec, - VP8IoPutHook put, - VP8IoSetupHook setup, - VP8IoTeardownHook teardown, - void* user_data) { - if (idec == NULL || idec->state_ > STATE_WEBP_HEADER) { - return 0; - } - - idec->io_.put = put; - idec->io_.setup = setup; - idec->io_.teardown = teardown; - idec->io_.opaque = user_data; - - return 1; -} |