1a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Copyright 2011 Google Inc. All Rights Reserved. 203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// 30406ce1417f76f2034833414dcecc9f56253640cVikas Arora// Use of this source code is governed by a BSD-style license 40406ce1417f76f2034833414dcecc9f56253640cVikas Arora// that can be found in the COPYING file in the root of the source 50406ce1417f76f2034833414dcecc9f56253640cVikas Arora// tree. An additional intellectual property rights grant can be found 60406ce1417f76f2034833414dcecc9f56253640cVikas Arora// in the file PATENTS. All contributing project authors may 70406ce1417f76f2034833414dcecc9f56253640cVikas Arora// be found in the AUTHORS file in the root of the source tree. 803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// ----------------------------------------------------------------------------- 903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// 1003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Incremental decoding 1103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// 1203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Author: somnath@google.com (Somnath Banerjee) 1303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 1403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora#include <assert.h> 1503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora#include <string.h> 1603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora#include <stdlib.h> 1703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 188b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora#include "./alphai.h" 19a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#include "./webpi.h" 20a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#include "./vp8i.h" 21a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora#include "../utils/utils.h" 2203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 23a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// In append mode, buffer allocations increase as multiples of this value. 24a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Needs to be a power of 2. 2503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora#define CHUNK_SIZE 4096 2603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora#define MAX_MB_SIZE 4096 2703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 2803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 2903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Data structures for memory and states 3003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 318b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// Decoding states. State normally flows as: 328b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// WEBP_HEADER->VP8_HEADER->VP8_PARTS0->VP8_DATA->DONE for a lossy image, and 338b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora// WEBP_HEADER->VP8L_HEADER->VP8L_DATA->DONE for a lossless image. 3403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// If there is any error the decoder goes into state ERROR. 35a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroratypedef enum { 368b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora STATE_WEBP_HEADER, // All the data before that of the VP8/VP8L chunk. 378b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora STATE_VP8_HEADER, // The VP8 Frame header (within the VP8 chunk). 38a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora STATE_VP8_PARTS0, 39a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora STATE_VP8_DATA, 40a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora STATE_VP8L_HEADER, 41a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora STATE_VP8L_DATA, 42a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora STATE_DONE, 43a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora STATE_ERROR 4403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} DecState; 4503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 4603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Operating state for the MemBuffer 47a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroratypedef enum { 48a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora MEM_MODE_NONE = 0, 49a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora MEM_MODE_APPEND, 50a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora MEM_MODE_MAP 5103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} MemBufferMode; 5203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 5303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// storage for partition #0 and partial data (in a rolling fashion) 5403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Aroratypedef struct { 5503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora MemBufferMode mode_; // Operation mode 56a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t start_; // start location of the data to be decoded 57a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t end_; // end location 5803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora size_t buf_size_; // size of the allocated buffer 5903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora uint8_t* buf_; // We don't own this buffer in case WebPIUpdate() 6003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 6103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora size_t part0_size_; // size of partition #0 6203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const uint8_t* part0_buf_; // buffer to store partition #0 6303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} MemBuffer; 6403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 6503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastruct WebPIDecoder { 6603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora DecState state_; // current decoding state 6703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora WebPDecParams params_; // Params to store output info 68a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int is_lossless_; // for down-casting 'dec_'. 69a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora void* dec_; // either a VP8Decoder or a VP8LDecoder instance 7003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8Io io_; 7103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 72466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora MemBuffer mem_; // input memory buffer. 73466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPDecBuffer output_; // output buffer (when no external one is supplied) 74a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t chunk_size_; // Compressed VP8/VP8L size extracted from Header. 75af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 76af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int last_mb_y_; // last row reached for intra-mode decoding 7703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora}; 7803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 7903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// MB context to restore in case VP8DecodeMB() fails 8003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Aroratypedef struct { 8103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8MB left_; 8203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8MB info_; 8303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8BitReader token_br_; 8403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} MBContext; 8503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 8603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 8703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// MemBuffer: incoming data handling 8803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 89a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic WEBP_INLINE size_t MemDataSize(const MemBuffer* mem) { 9003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return (mem->end_ - mem->start_); 9103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 9203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 930406ce1417f76f2034833414dcecc9f56253640cVikas Arora// Check if we need to preserve the compressed alpha data, as it may not have 940406ce1417f76f2034833414dcecc9f56253640cVikas Arora// been decoded yet. 950406ce1417f76f2034833414dcecc9f56253640cVikas Arorastatic int NeedCompressedAlpha(const WebPIDecoder* const idec) { 968b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (idec->state_ == STATE_WEBP_HEADER) { 970406ce1417f76f2034833414dcecc9f56253640cVikas Arora // We haven't parsed the headers yet, so we don't know whether the image is 980406ce1417f76f2034833414dcecc9f56253640cVikas Arora // lossy or lossless. This also means that we haven't parsed the ALPH chunk. 990406ce1417f76f2034833414dcecc9f56253640cVikas Arora return 0; 1000406ce1417f76f2034833414dcecc9f56253640cVikas Arora } 1010406ce1417f76f2034833414dcecc9f56253640cVikas Arora if (idec->is_lossless_) { 1020406ce1417f76f2034833414dcecc9f56253640cVikas Arora return 0; // ALPH chunk is not present for lossless images. 1030406ce1417f76f2034833414dcecc9f56253640cVikas Arora } else { 1040406ce1417f76f2034833414dcecc9f56253640cVikas Arora const VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 1058b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora assert(dec != NULL); // Must be true as idec->state_ != STATE_WEBP_HEADER. 1060406ce1417f76f2034833414dcecc9f56253640cVikas Arora return (dec->alpha_data_ != NULL) && !dec->is_alpha_decoded_; 1070406ce1417f76f2034833414dcecc9f56253640cVikas Arora } 1080406ce1417f76f2034833414dcecc9f56253640cVikas Arora} 1090406ce1417f76f2034833414dcecc9f56253640cVikas Arora 110a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic void DoRemap(WebPIDecoder* const idec, ptrdiff_t offset) { 111a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora MemBuffer* const mem = &idec->mem_; 112a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint8_t* const new_base = mem->buf_ + mem->start_; 113a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // note: for VP8, setting up idec->io_ is only really needed at the beginning 114a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // of the decoding, till partition #0 is complete. 115a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->io_.data = new_base; 116a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->io_.data_size = MemDataSize(mem); 117a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 118a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->dec_ != NULL) { 119a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!idec->is_lossless_) { 120a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 121a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const int last_part = dec->num_parts_ - 1; 122a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (offset != 0) { 123a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int p; 124a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora for (p = 0; p <= last_part; ++p) { 125af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora VP8RemapBitReader(dec->parts_ + p, offset); 126a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 127a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Remap partition #0 data pointer to new offset, but only in MAP 128a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // mode (in APPEND mode, partition #0 is copied into a fixed memory). 129a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (mem->mode_ == MEM_MODE_MAP) { 130af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora VP8RemapBitReader(&dec->br_, offset); 131a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 132a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 133a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(last_part >= 0); 134a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora dec->parts_[last_part].buf_end_ = mem->buf_ + mem->end_; 1358b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (NeedCompressedAlpha(idec)) { 1368b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora ALPHDecoder* const alph_dec = dec->alph_dec_; 1378b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora dec->alpha_data_ += offset; 1388b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (alph_dec != NULL) { 1398b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (alph_dec->method_ == ALPHA_LOSSLESS_COMPRESSION) { 1408b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8LDecoder* const alph_vp8l_dec = alph_dec->vp8l_dec_; 1418b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora assert(alph_vp8l_dec != NULL); 1428b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora assert(dec->alpha_data_size_ >= ALPHA_HEADER_LEN); 1438b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8LBitReaderSetBuffer(&alph_vp8l_dec->br_, 1448b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora dec->alpha_data_ + ALPHA_HEADER_LEN, 1458b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora dec->alpha_data_size_ - ALPHA_HEADER_LEN); 1468b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } else { // alph_dec->method_ == ALPHA_NO_COMPRESSION 1478b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora // Nothing special to do in this case. 1488b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } 1498b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } 1508b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora } 151a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } else { // Resize lossless bitreader 152a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; 153a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8LBitReaderSetBuffer(&dec->br_, new_base, MemDataSize(mem)); 154a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 155a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 156a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 157a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 15803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Appends data to the end of MemBuffer->buf_. It expands the allocated memory 15903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// size if required and also updates VP8BitReader's if new memory is allocated. 16003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic int AppendToMemBuffer(WebPIDecoder* const idec, 16103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const uint8_t* const data, size_t data_size) { 1620406ce1417f76f2034833414dcecc9f56253640cVikas Arora VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 16303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora MemBuffer* const mem = &idec->mem_; 1640406ce1417f76f2034833414dcecc9f56253640cVikas Arora const int need_compressed_alpha = NeedCompressedAlpha(idec); 1650406ce1417f76f2034833414dcecc9f56253640cVikas Arora const uint8_t* const old_start = mem->buf_ + mem->start_; 1660406ce1417f76f2034833414dcecc9f56253640cVikas Arora const uint8_t* const old_base = 1670406ce1417f76f2034833414dcecc9f56253640cVikas Arora need_compressed_alpha ? dec->alpha_data_ : old_start; 16803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(mem->mode_ == MEM_MODE_APPEND); 169a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (data_size > MAX_CHUNK_PAYLOAD) { 170a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // security safeguard: trying to allocate more than what the format 171a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // allows for a chunk should be considered a smoke smell. 172a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return 0; 173a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 17403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 17503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (mem->end_ + data_size > mem->buf_size_) { // Need some free memory 1760406ce1417f76f2034833414dcecc9f56253640cVikas Arora const size_t new_mem_start = old_start - old_base; 1770406ce1417f76f2034833414dcecc9f56253640cVikas Arora const size_t current_size = MemDataSize(mem) + new_mem_start; 178a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint64_t new_size = (uint64_t)current_size + data_size; 179a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint64_t extra_size = (new_size + CHUNK_SIZE - 1) & ~(CHUNK_SIZE - 1); 180a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* const new_buf = 181a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora (uint8_t*)WebPSafeMalloc(extra_size, sizeof(*new_buf)); 182a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (new_buf == NULL) return 0; 183a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora memcpy(new_buf, old_base, current_size); 184af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPSafeFree(mem->buf_); 18503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->buf_ = new_buf; 186a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora mem->buf_size_ = (size_t)extra_size; 1870406ce1417f76f2034833414dcecc9f56253640cVikas Arora mem->start_ = new_mem_start; 188a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora mem->end_ = current_size; 18903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 19003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 19103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora memcpy(mem->buf_ + mem->end_, data, data_size); 19203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->end_ += data_size; 19303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(mem->end_ <= mem->buf_size_); 19403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 1950406ce1417f76f2034833414dcecc9f56253640cVikas Arora DoRemap(idec, mem->buf_ + mem->start_ - old_start); 19603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return 1; 19703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 19803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 19903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic int RemapMemBuffer(WebPIDecoder* const idec, 20003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const uint8_t* const data, size_t data_size) { 20103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora MemBuffer* const mem = &idec->mem_; 2020406ce1417f76f2034833414dcecc9f56253640cVikas Arora const uint8_t* const old_buf = mem->buf_; 2030406ce1417f76f2034833414dcecc9f56253640cVikas Arora const uint8_t* const old_start = old_buf + mem->start_; 20403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(mem->mode_ == MEM_MODE_MAP); 20503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 206a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (data_size < mem->buf_size_) return 0; // can't remap to a shorter buffer! 20703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 20803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->buf_ = (uint8_t*)data; 20903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->end_ = mem->buf_size_ = data_size; 21003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 2110406ce1417f76f2034833414dcecc9f56253640cVikas Arora DoRemap(idec, mem->buf_ + mem->start_ - old_start); 21203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return 1; 21303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 21403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 21503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic void InitMemBuffer(MemBuffer* const mem) { 21603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->mode_ = MEM_MODE_NONE; 217a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora mem->buf_ = NULL; 21803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->buf_size_ = 0; 219a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora mem->part0_buf_ = NULL; 22003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->part0_size_ = 0; 22103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 22203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 22303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic void ClearMemBuffer(MemBuffer* const mem) { 22403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(mem); 22503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (mem->mode_ == MEM_MODE_APPEND) { 226af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPSafeFree(mem->buf_); 227af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPSafeFree((void*)mem->part0_buf_); 22803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 22903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 23003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 23103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic int CheckMemBufferMode(MemBuffer* const mem, MemBufferMode expected) { 23203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (mem->mode_ == MEM_MODE_NONE) { 23303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->mode_ = expected; // switch to the expected mode 23403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } else if (mem->mode_ != expected) { 23503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return 0; // we mixed the modes => error 23603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 23703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(mem->mode_ == expected); // mode is ok 23803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return 1; 23903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 24003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 241af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// To be called last. 242af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic VP8StatusCode FinishDecoding(WebPIDecoder* const idec) { 243af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#if WEBP_DECODER_ABI_VERSION > 0x0203 244af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const WebPDecoderOptions* const options = idec->params_.options; 245af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPDecBuffer* const output = idec->params_.output; 246af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 247af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora idec->state_ = STATE_DONE; 248af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (options != NULL && options->flip) { 249af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return WebPFlipBuffer(output); 250af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 251af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#endif 252af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora idec->state_ = STATE_DONE; 253af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return VP8_STATUS_OK; 254af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 255af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 25603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 25703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Macroblock-decoding contexts 25803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 25903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic void SaveContext(const VP8Decoder* dec, const VP8BitReader* token_br, 26003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora MBContext* const context) { 261af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora context->left_ = dec->mb_info_[-1]; 262af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora context->info_ = dec->mb_info_[dec->mb_x_]; 26303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora context->token_br_ = *token_br; 26403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 26503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 26603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic void RestoreContext(const MBContext* context, VP8Decoder* const dec, 26703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8BitReader* const token_br) { 268af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dec->mb_info_[-1] = context->left_; 269af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dec->mb_info_[dec->mb_x_] = context->info_; 27003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora *token_br = context->token_br_; 27103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 27203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 27303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 27403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 275a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic VP8StatusCode IDecError(WebPIDecoder* const idec, VP8StatusCode error) { 276a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->state_ == STATE_VP8_DATA) { 27788fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora VP8Io* const io = &idec->io_; 2788b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (io->teardown != NULL) { 27988fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora io->teardown(io); 28088fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora } 28188fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora } 28203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora idec->state_ = STATE_ERROR; 28303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return error; 28403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 28503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 286a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic void ChangeState(WebPIDecoder* const idec, DecState new_state, 287a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t consumed_bytes) { 288a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora MemBuffer* const mem = &idec->mem_; 289a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->state_ = new_state; 290a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora mem->start_ += consumed_bytes; 291a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(mem->start_ <= mem->end_); 292a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->io_.data = mem->buf_ + mem->start_; 293a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->io_.data_size = MemDataSize(mem); 294a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 295a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 296a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora// Headers 297a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic VP8StatusCode DecodeWebPHeaders(WebPIDecoder* const idec) { 298a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora MemBuffer* const mem = &idec->mem_; 299a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint8_t* data = mem->buf_ + mem->start_; 300a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t curr_size = MemDataSize(mem); 301a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8StatusCode status; 302a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora WebPHeaderStructure headers; 303a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 304a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora headers.data = data; 305a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora headers.data_size = curr_size; 306af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora headers.have_all_data = 0; 307a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora status = WebPParseHeaders(&headers); 308a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (status == VP8_STATUS_NOT_ENOUGH_DATA) { 309a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_SUSPENDED; // We haven't found a VP8 chunk yet. 310a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } else if (status != VP8_STATUS_OK) { 311a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return IDecError(idec, status); 312a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 313a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 314a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->chunk_size_ = headers.compressed_size; 315a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->is_lossless_ = headers.is_lossless; 316a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!idec->is_lossless_) { 317a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8Decoder* const dec = VP8New(); 318a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (dec == NULL) { 319a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_OUT_OF_MEMORY; 320a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 321a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->dec_ = dec; 322a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora dec->alpha_data_ = headers.alpha_data; 323a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora dec->alpha_data_size_ = headers.alpha_data_size; 3248b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora ChangeState(idec, STATE_VP8_HEADER, headers.offset); 325a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } else { 326a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8LDecoder* const dec = VP8LNew(); 327a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (dec == NULL) { 328a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_OUT_OF_MEMORY; 329a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 330a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->dec_ = dec; 331a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora ChangeState(idec, STATE_VP8L_HEADER, headers.offset); 332a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 333a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_OK; 334a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 335a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 336a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic VP8StatusCode DecodeVP8FrameHeader(WebPIDecoder* const idec) { 33703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const uint8_t* data = idec->mem_.buf_ + idec->mem_.start_; 338a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const size_t curr_size = MemDataSize(&idec->mem_); 3398b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora int width, height; 340a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint32_t bits; 34103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 342a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (curr_size < VP8_FRAME_HEADER_SIZE) { 343a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Not enough data bytes to extract VP8 Frame Header. 34403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_SUSPENDED; 34503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 3468b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (!VP8GetInfo(data, curr_size, idec->chunk_size_, &width, &height)) { 34703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); 34803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 349466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 35003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora bits = data[0] | (data[1] << 8) | (data[2] << 16); 351a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->mem_.part0_size_ = (bits >> 5) + VP8_FRAME_HEADER_SIZE; 35203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 35303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora idec->io_.data = data; 354a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->io_.data_size = curr_size; 355a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->state_ = STATE_VP8_PARTS0; 35603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_OK; 35703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 35803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 35903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Partition #0 360a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic int CopyParts0Data(WebPIDecoder* const idec) { 361a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 362a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8BitReader* const br = &dec->br_; 36303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const size_t psize = br->buf_end_ - br->buf_; 36403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora MemBuffer* const mem = &idec->mem_; 365a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(!idec->is_lossless_); 366a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(mem->part0_buf_ == NULL); 36703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(psize > 0); 368a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(psize <= mem->part0_size_); // Format limit: no need for runtime check 36903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (mem->mode_ == MEM_MODE_APPEND) { 37003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // We copy and grab ownership of the partition #0 data. 371af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint8_t* const part0_buf = (uint8_t*)WebPSafeMalloc(1ULL, psize); 372a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (part0_buf == NULL) { 37303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return 0; 37403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 37503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora memcpy(part0_buf, br->buf_, psize); 37603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora mem->part0_buf_ = part0_buf; 37703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora br->buf_ = part0_buf; 37803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora br->buf_end_ = part0_buf + psize; 37903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } else { 38003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Else: just keep pointers to the partition #0's data in dec_->br_. 38103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 382a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora mem->start_ += psize; 38303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return 1; 38403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 38503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 38603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic VP8StatusCode DecodePartition0(WebPIDecoder* const idec) { 387a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 38803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8Io* const io = &idec->io_; 38903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const WebPDecParams* const params = &idec->params_; 390466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPDecBuffer* const output = params->output; 39103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 39203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Wait till we have enough data for the whole partition #0 39303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (MemDataSize(&idec->mem_) < idec->mem_.part0_size_) { 39403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_SUSPENDED; 39503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 39603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 39703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!VP8GetHeaders(dec, io)) { 39803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora const VP8StatusCode status = dec->status_; 39903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (status == VP8_STATUS_SUSPENDED || 40003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora status == VP8_STATUS_NOT_ENOUGH_DATA) { 40103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // treating NOT_ENOUGH_DATA as SUSPENDED state 40203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_SUSPENDED; 40303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 40403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecError(idec, status); 40503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 40603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 407466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora // Allocate/Verify output buffer now 408466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora dec->status_ = WebPAllocateDecBuffer(io->width, io->height, params->options, 409466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora output); 410466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (dec->status_ != VP8_STATUS_OK) { 411466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return IDecError(idec, dec->status_); 41203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 4138b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora // This change must be done before calling VP8InitFrame() 4148b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora dec->mt_method_ = VP8GetThreadMethod(params->options, NULL, 4158b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora io->width, io->height); 4168b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8InitDithering(params->options, dec); 41703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!CopyParts0Data(idec)) { 41803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecError(idec, VP8_STATUS_OUT_OF_MEMORY); 41903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 42088fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora 421a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Finish setting up the decoding parameters. Will call io->setup(). 422a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (VP8EnterCritical(dec, io) != VP8_STATUS_OK) { 42388fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora return IDecError(idec, dec->status_); 42488fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora } 425a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 42688fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora // Note: past this point, teardown() must always be called 42788fe2b83c4b9232cd08729556fd0485d6a6a92cdVikas Arora // in case of error. 428a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->state_ = STATE_VP8_DATA; 429a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Allocate memory and prepare everything. 430a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!VP8InitFrame(dec, io)) { 431a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return IDecError(idec, dec->status_); 432a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 43303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_OK; 43403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 43503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 43603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Remaining partitions 43703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic VP8StatusCode DecodeRemaining(WebPIDecoder* const idec) { 438a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 43903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8Io* const io = &idec->io_; 44003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 44103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(dec->ready_); 44203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora for (; dec->mb_y_ < dec->mb_h_; ++dec->mb_y_) { 443af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (idec->last_mb_y_ != dec->mb_y_) { 444af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!VP8ParseIntraModeRow(&dec->br_, dec)) { 445af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // note: normally, error shouldn't occur since we already have the whole 446af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // partition0 available here in DecodeRemaining(). Reaching EOF while 447af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // reading intra modes really means a BITSTREAM_ERROR. 448af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); 449af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 450af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora idec->last_mb_y_ = dec->mb_y_; 451af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 4528b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora for (; dec->mb_x_ < dec->mb_w_; ++dec->mb_x_) { 453af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora VP8BitReader* const token_br = 454af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora &dec->parts_[dec->mb_y_ & (dec->num_parts_ - 1)]; 45503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora MBContext context; 45603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora SaveContext(dec, token_br, &context); 45703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!VP8DecodeMB(dec, token_br)) { 45803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // We shouldn't fail when MAX_MB data was available 45903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (dec->num_parts_ == 1 && MemDataSize(&idec->mem_) > MAX_MB_SIZE) { 46003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); 46103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 462af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora RestoreContext(&context, dec, token_br); 46303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_SUSPENDED; 46403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 46503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Release buffer only if there is only one partition 46603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (dec->num_parts_ == 1) { 46703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora idec->mem_.start_ = token_br->buf_ - idec->mem_.buf_; 46803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(idec->mem_.start_ <= idec->mem_.end_); 46903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 47003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 4718b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8InitScanline(dec); // Prepare for next scanline 4728b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora 4738b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora // Reconstruct, filter and emit the row. 474a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!VP8ProcessRow(dec, io)) { 47503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecError(idec, VP8_STATUS_USER_ABORT); 47603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 47703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 478a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Synchronize the thread and check for errors. 479a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!VP8ExitCritical(dec, io)) { 480a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return IDecError(idec, VP8_STATUS_USER_ABORT); 48103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 48203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora dec->ready_ = 0; 483af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return FinishDecoding(idec); 48403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 48503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 4868b720228d581a84fd173b6dcb2fa295b59db489aVikas Arorastatic VP8StatusCode ErrorStatusLossless(WebPIDecoder* const idec, 4878b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8StatusCode status) { 488a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (status == VP8_STATUS_SUSPENDED || status == VP8_STATUS_NOT_ENOUGH_DATA) { 489a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_SUSPENDED; 490a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 491a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return IDecError(idec, status); 492a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 493a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 494a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic VP8StatusCode DecodeVP8LHeader(WebPIDecoder* const idec) { 495a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8Io* const io = &idec->io_; 496a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; 497a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const WebPDecParams* const params = &idec->params_; 498a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora WebPDecBuffer* const output = params->output; 499a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t curr_size = MemDataSize(&idec->mem_); 500a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(idec->is_lossless_); 501a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 502a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Wait until there's enough data for decoding header. 503a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (curr_size < (idec->chunk_size_ >> 3)) { 504a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_SUSPENDED; 505a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 506a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!VP8LDecodeHeader(dec, io)) { 507a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return ErrorStatusLossless(idec, dec->status_); 508a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 509a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // Allocate/verify output buffer now. 510a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora dec->status_ = WebPAllocateDecBuffer(io->width, io->height, params->options, 511a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora output); 512a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (dec->status_ != VP8_STATUS_OK) { 513a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return IDecError(idec, dec->status_); 514a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 515a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 516a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->state_ = STATE_VP8L_DATA; 517a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_OK; 518a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 519a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 520a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorastatic VP8StatusCode DecodeVP8LData(WebPIDecoder* const idec) { 521a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; 522a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const size_t curr_size = MemDataSize(&idec->mem_); 523a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora assert(idec->is_lossless_); 524a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 525a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // At present Lossless decoder can't decode image incrementally. So wait till 526a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora // all the image data is aggregated before image can be decoded. 527a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (curr_size < idec->chunk_size_) { 528a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_SUSPENDED; 529a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 530a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 531a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!VP8LDecodeImage(dec)) { 532a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return ErrorStatusLossless(idec, dec->status_); 533a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 534a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 535af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return FinishDecoding(idec); 536a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 537a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 53803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Main decoding loop 53903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic VP8StatusCode IDecode(WebPIDecoder* idec) { 54003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8StatusCode status = VP8_STATUS_SUSPENDED; 54103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 5428b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (idec->state_ == STATE_WEBP_HEADER) { 543a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora status = DecodeWebPHeaders(idec); 544a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } else { 545a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->dec_ == NULL) { 546a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return VP8_STATUS_SUSPENDED; // can't continue if we have no decoder. 547a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 54803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 5498b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (idec->state_ == STATE_VP8_HEADER) { 550a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora status = DecodeVP8FrameHeader(idec); 551a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 552a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->state_ == STATE_VP8_PARTS0) { 55303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora status = DecodePartition0(idec); 55403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 555a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->state_ == STATE_VP8_DATA) { 556466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora status = DecodeRemaining(idec); 55703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 558a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->state_ == STATE_VP8L_HEADER) { 559a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora status = DecodeVP8LHeader(idec); 560a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 561a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->state_ == STATE_VP8L_DATA) { 562a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora status = DecodeVP8LData(idec); 563a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 56403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return status; 56503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 56603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 56703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 56803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora// Public functions 56903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 570a2415724fb3466168b2af5b08bd94ba732c0e753Vikas AroraWebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer) { 571af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPIDecoder* idec = (WebPIDecoder*)WebPSafeCalloc(1ULL, sizeof(*idec)); 572466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (idec == NULL) { 573466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return NULL; 574466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 57503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 5768b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora idec->state_ = STATE_WEBP_HEADER; 577a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->chunk_size_ = 0; 57803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 579af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora idec->last_mb_y_ = -1; 580af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 58103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora InitMemBuffer(&idec->mem_); 582466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPInitDecBuffer(&idec->output_); 58303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8InitIo(&idec->io_); 584466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 585466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPResetDecParams(&idec->params_); 5868b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora idec->params_.output = (output_buffer != NULL) ? output_buffer 5878b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora : &idec->output_; 588466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPInitCustomIo(&idec->params_, &idec->io_); // Plug the I/O functions. 589466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 590466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return idec; 591466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora} 592466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 593a2415724fb3466168b2af5b08bd94ba732c0e753Vikas AroraWebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size, 594a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora WebPDecoderConfig* config) { 595466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPIDecoder* idec; 596466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 597466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora // Parse the bitstream's features, if requested: 598466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (data != NULL && data_size > 0 && config != NULL) { 599466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (WebPGetFeatures(data, data_size, &config->input) != VP8_STATUS_OK) { 600466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return NULL; 601466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 602466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 603466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora // Create an instance of the incremental decoder 604466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec = WebPINewDecoder(config ? &config->output : NULL); 605a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec == NULL) { 606466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return NULL; 607466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 608466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora // Finish initialization 609466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (config != NULL) { 610466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->params_.options = &config->options; 611466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 61203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return idec; 61303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 61403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 615a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroravoid WebPIDelete(WebPIDecoder* idec) { 616a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec == NULL) return; 617a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->dec_ != NULL) { 618a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (!idec->is_lossless_) { 619513e97bd307573e2adc776eb5368bd129aceaa4aVikas Arora if (idec->state_ == STATE_VP8_DATA) { 620513e97bd307573e2adc776eb5368bd129aceaa4aVikas Arora // Synchronize the thread, clean-up and check for errors. 6218b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8ExitCritical((VP8Decoder*)idec->dec_, &idec->io_); 622513e97bd307573e2adc776eb5368bd129aceaa4aVikas Arora } 6238b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8Delete((VP8Decoder*)idec->dec_); 624a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } else { 6258b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora VP8LDelete((VP8LDecoder*)idec->dec_); 626a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 627a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 62803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora ClearMemBuffer(&idec->mem_); 629466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora WebPFreeDecBuffer(&idec->output_); 630af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPSafeFree(idec); 63103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 63203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 63303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 634466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora// Wrapper toward WebPINewDecoder 635466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 63603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas AroraWebPIDecoder* WebPINewRGB(WEBP_CSP_MODE mode, uint8_t* output_buffer, 637a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora size_t output_buffer_size, int output_stride) { 6381e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int is_external_memory = (output_buffer != NULL); 63903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora WebPIDecoder* idec; 6401e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 641466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (mode >= MODE_YUV) return NULL; 6421e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (!is_external_memory) { // Overwrite parameters to sane values. 6431e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora output_buffer_size = 0; 6441e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora output_stride = 0; 6451e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora } else { // A buffer was passed. Validate the other params. 6461e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (output_stride == 0 || output_buffer_size == 0) { 6471e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora return NULL; // invalid parameter. 6481e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora } 6491e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora } 650466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec = WebPINewDecoder(NULL); 651a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec == NULL) return NULL; 652466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.colorspace = mode; 6531e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora idec->output_.is_external_memory = is_external_memory; 654466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.RGBA.rgba = output_buffer; 655466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.RGBA.stride = output_stride; 656466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.RGBA.size = output_buffer_size; 65703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return idec; 65803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 65903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 660a2415724fb3466168b2af5b08bd94ba732c0e753Vikas AroraWebPIDecoder* WebPINewYUVA(uint8_t* luma, size_t luma_size, int luma_stride, 661a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* u, size_t u_size, int u_stride, 662a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* v, size_t v_size, int v_stride, 663a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* a, size_t a_size, int a_stride) { 6641e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora const int is_external_memory = (luma != NULL); 6651e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora WebPIDecoder* idec; 6661e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora WEBP_CSP_MODE colorspace; 6671e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 6681e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (!is_external_memory) { // Overwrite parameters to sane values. 6691e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora luma_size = u_size = v_size = a_size = 0; 6701e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora luma_stride = u_stride = v_stride = a_stride = 0; 6711e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora u = v = a = NULL; 6721e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora colorspace = MODE_YUVA; 6731e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora } else { // A luma buffer was passed. Validate the other parameters. 6741e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (u == NULL || v == NULL) return NULL; 6751e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (luma_size == 0 || u_size == 0 || v_size == 0) return NULL; 6761e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (luma_stride == 0 || u_stride == 0 || v_stride == 0) return NULL; 6771e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (a != NULL) { 6781e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora if (a_size == 0 || a_stride == 0) return NULL; 6791e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora } 6801e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora colorspace = (a == NULL) ? MODE_YUV : MODE_YUVA; 6811e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora } 6821e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 6831e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora idec = WebPINewDecoder(NULL); 684a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec == NULL) return NULL; 6851e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora 6861e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora idec->output_.colorspace = colorspace; 6871e7bf8805bd030c19924a5306837ecd72c295751Vikas Arora idec->output_.is_external_memory = is_external_memory; 688466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.y = luma; 689466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.y_stride = luma_stride; 690466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.y_size = luma_size; 691466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.u = u; 692466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.u_stride = u_stride; 693466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.u_size = u_size; 694466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.v = v; 695466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.v_stride = v_stride; 696466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora idec->output_.u.YUVA.v_size = v_size; 697a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->output_.u.YUVA.a = a; 698a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->output_.u.YUVA.a_stride = a_stride; 699a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora idec->output_.u.YUVA.a_size = a_size; 70003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return idec; 70103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 70203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 703a2415724fb3466168b2af5b08bd94ba732c0e753Vikas AroraWebPIDecoder* WebPINewYUV(uint8_t* luma, size_t luma_size, int luma_stride, 704a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* u, size_t u_size, int u_stride, 705a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t* v, size_t v_size, int v_stride) { 706a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return WebPINewYUVA(luma, luma_size, luma_stride, 707a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora u, u_size, u_stride, 708a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora v, v_size, v_stride, 709a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora NULL, 0, 0); 710a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora} 711a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora 71203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 71303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 71403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arorastatic VP8StatusCode IDecCheckStatus(const WebPIDecoder* const idec) { 71503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora assert(idec); 71603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (idec->state_ == STATE_ERROR) { 71703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_BITSTREAM_ERROR; 71803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 71903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (idec->state_ == STATE_DONE) { 72003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_OK; 72103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 72203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_SUSPENDED; 72303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 72403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 725a2415724fb3466168b2af5b08bd94ba732c0e753Vikas AroraVP8StatusCode WebPIAppend(WebPIDecoder* idec, 726a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint8_t* data, size_t data_size) { 72703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8StatusCode status; 72803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (idec == NULL || data == NULL) { 72903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_INVALID_PARAM; 73003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 73103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora status = IDecCheckStatus(idec); 73203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (status != VP8_STATUS_SUSPENDED) { 73303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return status; 73403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 73503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Check mixed calls between RemapMemBuffer and AppendToMemBuffer. 73603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!CheckMemBufferMode(&idec->mem_, MEM_MODE_APPEND)) { 73703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_INVALID_PARAM; 73803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 73903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Append data to memory buffer 74003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!AppendToMemBuffer(idec, data, data_size)) { 74103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_OUT_OF_MEMORY; 74203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 74303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecode(idec); 74403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 74503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 746a2415724fb3466168b2af5b08bd94ba732c0e753Vikas AroraVP8StatusCode WebPIUpdate(WebPIDecoder* idec, 747a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora const uint8_t* data, size_t data_size) { 74803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora VP8StatusCode status; 74903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (idec == NULL || data == NULL) { 75003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_INVALID_PARAM; 75103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 75203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora status = IDecCheckStatus(idec); 75303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (status != VP8_STATUS_SUSPENDED) { 75403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return status; 75503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 75603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Check mixed calls between RemapMemBuffer and AppendToMemBuffer. 75703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!CheckMemBufferMode(&idec->mem_, MEM_MODE_MAP)) { 75803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_INVALID_PARAM; 75903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 76003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora // Make the memory buffer point to the new buffer 76103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora if (!RemapMemBuffer(idec, data, data_size)) { 76203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return VP8_STATUS_INVALID_PARAM; 76303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 76403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return IDecode(idec); 76503d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 76603d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 76703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora//------------------------------------------------------------------------------ 76803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 769466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arorastatic const WebPDecBuffer* GetOutputBuffer(const WebPIDecoder* const idec) { 770a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec == NULL || idec->dec_ == NULL) { 771a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora return NULL; 772a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora } 773a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (idec->state_ <= STATE_VP8_PARTS0) { 774466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return NULL; 775466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 776466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return idec->params_.output; 777466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora} 778466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 779a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Aroraconst WebPDecBuffer* WebPIDecodedArea(const WebPIDecoder* idec, 780a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int* left, int* top, 781a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int* width, int* height) { 782466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora const WebPDecBuffer* const src = GetOutputBuffer(idec); 783a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (left != NULL) *left = 0; 784a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (top != NULL) *top = 0; 785466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora // TODO(skal): later include handling of rotations. 786466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (src) { 787a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (width != NULL) *width = src->width; 788a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (height != NULL) *height = idec->params_.last_y; 789466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } else { 790a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (width != NULL) *width = 0; 791a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (height != NULL) *height = 0; 792466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora } 793466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return src; 794466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora} 795466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 796a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorauint8_t* WebPIDecGetRGB(const WebPIDecoder* idec, int* last_y, 79703d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora int* width, int* height, int* stride) { 798466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora const WebPDecBuffer* const src = GetOutputBuffer(idec); 799a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (src == NULL) return NULL; 800466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (src->colorspace >= MODE_YUV) { 80103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return NULL; 80203d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 80303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 804a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (last_y != NULL) *last_y = idec->params_.last_y; 805a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (width != NULL) *width = src->width; 806a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (height != NULL) *height = src->height; 807a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (stride != NULL) *stride = src->u.RGBA.stride; 80803d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 809466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return src->u.RGBA.rgba; 81003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 81103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 812a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arorauint8_t* WebPIDecGetYUVA(const WebPIDecoder* idec, int* last_y, 813a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora uint8_t** u, uint8_t** v, uint8_t** a, 814a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int* width, int* height, 815a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora int* stride, int* uv_stride, int* a_stride) { 816466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora const WebPDecBuffer* const src = GetOutputBuffer(idec); 817a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (src == NULL) return NULL; 818466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora if (src->colorspace < MODE_YUV) { 81903d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora return NULL; 82003d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora } 82103d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 822a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (last_y != NULL) *last_y = idec->params_.last_y; 823a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (u != NULL) *u = src->u.YUVA.u; 824a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (v != NULL) *v = src->u.YUVA.v; 825a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (a != NULL) *a = src->u.YUVA.a; 826a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (width != NULL) *width = src->width; 827a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (height != NULL) *height = src->height; 828a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (stride != NULL) *stride = src->u.YUVA.y_stride; 829a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (uv_stride != NULL) *uv_stride = src->u.YUVA.u_stride; 830a2415724fb3466168b2af5b08bd94ba732c0e753Vikas Arora if (a_stride != NULL) *a_stride = src->u.YUVA.a_stride; 831466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora 832466727975bcc57c0c5597bcd0747a2fe4777b303Vikas Arora return src->u.YUVA.y; 83303d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora} 83403d5e34c70f174c16282b0efdc6bb9473df5f8f1Vikas Arora 8353417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Aroraint WebPISetIOHooks(WebPIDecoder* const idec, 8363417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora VP8IoPutHook put, 8373417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora VP8IoSetupHook setup, 8383417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora VP8IoTeardownHook teardown, 8393417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora void* user_data) { 8408b720228d581a84fd173b6dcb2fa295b59db489aVikas Arora if (idec == NULL || idec->state_ > STATE_WEBP_HEADER) { 8413417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora return 0; 8423417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora } 8433417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora 8443417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora idec->io_.put = put; 8453417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora idec->io_.setup = setup; 8463417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora idec->io_.teardown = teardown; 8473417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora idec->io_.opaque = user_data; 8483417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora 8493417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora return 1; 8503417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora} 8513417a639b7b2a482a76019e987c9cfb5045e1ceeVikas Arora 852