15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright 2011 Google Inc. All Rights Reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 3eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// Use of this source code is governed by a BSD-style license 4eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// that can be found in the COPYING file in the root of the source 5eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// tree. An additional intellectual property rights grant can be found 6eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// in the file PATENTS. All contributing project authors may 7eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// be found in the AUTHORS file in the root of the source tree. 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// ----------------------------------------------------------------------------- 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Incremental decoding 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Author: somnath@google.com (Somnath Banerjee) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <assert.h> 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <string.h> 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <stdlib.h> 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "./alphai.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "./webpi.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "./vp8i.h" 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "../utils/utils.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// In append mode, buffer allocations increase as multiples of this value. 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Needs to be a power of 2. 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define CHUNK_SIZE 4096 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MAX_MB_SIZE 4096 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Data structures for memory and states 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// Decoding states. State normally flows as: 325d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// WEBP_HEADER->VP8_HEADER->VP8_PARTS0->VP8_DATA->DONE for a lossy image, and 335d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// WEBP_HEADER->VP8L_HEADER->VP8L_DATA->DONE for a lossless image. 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// If there is any error the decoder goes into state ERROR. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef enum { 365d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) STATE_WEBP_HEADER, // All the data before that of the VP8/VP8L chunk. 375d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) STATE_VP8_HEADER, // The VP8 Frame header (within the VP8 chunk). 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STATE_VP8_PARTS0, 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STATE_VP8_DATA, 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STATE_VP8L_HEADER, 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STATE_VP8L_DATA, 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STATE_DONE, 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STATE_ERROR 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} DecState; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Operating state for the MemBuffer 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef enum { 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MEM_MODE_NONE = 0, 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MEM_MODE_APPEND, 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MEM_MODE_MAP 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} MemBufferMode; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// storage for partition #0 and partial data (in a rolling fashion) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef struct { 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBufferMode mode_; // Operation mode 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t start_; // start location of the data to be decoded 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t end_; // end location 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t buf_size_; // size of the allocated buffer 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* buf_; // We don't own this buffer in case WebPIUpdate() 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t part0_size_; // size of partition #0 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* part0_buf_; // buffer to store partition #0 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} MemBuffer; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct WebPIDecoder { 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DecState state_; // current decoding state 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecParams params_; // Params to store output info 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int is_lossless_; // for down-casting 'dec_'. 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void* dec_; // either a VP8Decoder or a VP8LDecoder instance 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Io io_; 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer mem_; // input memory buffer. 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecBuffer output_; // output buffer (when no external one is supplied) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t chunk_size_; // Compressed VP8/VP8L size extracted from Header. 755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int last_mb_y_; // last row reached for intra-mode decoding 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// MB context to restore in case VP8DecodeMB() fails 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef struct { 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8MB left_; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8MB info_; 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8BitReader token_br_; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} MBContext; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// MemBuffer: incoming data handling 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static WEBP_INLINE size_t MemDataSize(const MemBuffer* mem) { 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (mem->end_ - mem->start_); 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 93eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// Check if we need to preserve the compressed alpha data, as it may not have 94eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// been decoded yet. 95eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochstatic int NeedCompressedAlpha(const WebPIDecoder* const idec) { 965d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (idec->state_ == STATE_WEBP_HEADER) { 97eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // We haven't parsed the headers yet, so we don't know whether the image is 98eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // lossy or lossless. This also means that we haven't parsed the ALPH chunk. 99eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch return 0; 100eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch } 101eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (idec->is_lossless_) { 102eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch return 0; // ALPH chunk is not present for lossless images. 103eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch } else { 104eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 1055d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) assert(dec != NULL); // Must be true as idec->state_ != STATE_WEBP_HEADER. 106eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch return (dec->alpha_data_ != NULL) && !dec->is_alpha_decoded_; 107eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch } 108eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch} 109eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void DoRemap(WebPIDecoder* const idec, ptrdiff_t offset) { 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer* const mem = &idec->mem_; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* const new_base = mem->buf_ + mem->start_; 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // note: for VP8, setting up idec->io_ is only really needed at the beginning 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // of the decoding, till partition #0 is complete. 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.data = new_base; 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.data_size = MemDataSize(mem); 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->dec_ != NULL) { 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!idec->is_lossless_) { 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int last_part = dec->num_parts_ - 1; 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (offset != 0) { 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int p; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (p = 0; p <= last_part; ++p) { 1255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) VP8RemapBitReader(dec->parts_ + p, offset); 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Remap partition #0 data pointer to new offset, but only in MAP 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // mode (in APPEND mode, partition #0 is copied into a fixed memory). 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mem->mode_ == MEM_MODE_MAP) { 1305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) VP8RemapBitReader(&dec->br_, offset); 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(last_part >= 0); 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dec->parts_[last_part].buf_end_ = mem->buf_ + mem->end_; 1355d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (NeedCompressedAlpha(idec)) { 1365d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) ALPHDecoder* const alph_dec = dec->alph_dec_; 1375d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) dec->alpha_data_ += offset; 1385d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (alph_dec != NULL) { 1395d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (alph_dec->method_ == ALPHA_LOSSLESS_COMPRESSION) { 1405d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8LDecoder* const alph_vp8l_dec = alph_dec->vp8l_dec_; 1415d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) assert(alph_vp8l_dec != NULL); 1425d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) assert(dec->alpha_data_size_ >= ALPHA_HEADER_LEN); 1435d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8LBitReaderSetBuffer(&alph_vp8l_dec->br_, 1445d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) dec->alpha_data_ + ALPHA_HEADER_LEN, 1455d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) dec->alpha_data_size_ - ALPHA_HEADER_LEN); 1465d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } else { // alph_dec->method_ == ALPHA_NO_COMPRESSION 1475d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // Nothing special to do in this case. 1485d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 1495d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 1505d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { // Resize lossless bitreader 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8LBitReaderSetBuffer(&dec->br_, new_base, MemDataSize(mem)); 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Appends data to the end of MemBuffer->buf_. It expands the allocated memory 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// size if required and also updates VP8BitReader's if new memory is allocated. 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int AppendToMemBuffer(WebPIDecoder* const idec, 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* const data, size_t data_size) { 162eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer* const mem = &idec->mem_; 164eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const int need_compressed_alpha = NeedCompressedAlpha(idec); 165eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const uint8_t* const old_start = mem->buf_ + mem->start_; 166eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const uint8_t* const old_base = 167eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch need_compressed_alpha ? dec->alpha_data_ : old_start; 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem->mode_ == MEM_MODE_APPEND); 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (data_size > MAX_CHUNK_PAYLOAD) { 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // security safeguard: trying to allocate more than what the format 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // allows for a chunk should be considered a smoke smell. 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mem->end_ + data_size > mem->buf_size_) { // Need some free memory 176eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const size_t new_mem_start = old_start - old_base; 177eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const size_t current_size = MemDataSize(mem) + new_mem_start; 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint64_t new_size = (uint64_t)current_size + data_size; 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint64_t extra_size = (new_size + CHUNK_SIZE - 1) & ~(CHUNK_SIZE - 1); 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* const new_buf = 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (uint8_t*)WebPSafeMalloc(extra_size, sizeof(*new_buf)); 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_buf == NULL) return 0; 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(new_buf, old_base, current_size); 1845f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPSafeFree(mem->buf_); 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->buf_ = new_buf; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->buf_size_ = (size_t)extra_size; 187eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch mem->start_ = new_mem_start; 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->end_ = current_size; 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(mem->buf_ + mem->end_, data, data_size); 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->end_ += data_size; 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem->end_ <= mem->buf_size_); 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch DoRemap(idec, mem->buf_ + mem->start_ - old_start); 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int RemapMemBuffer(WebPIDecoder* const idec, 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* const data, size_t data_size) { 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer* const mem = &idec->mem_; 202eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const uint8_t* const old_buf = mem->buf_; 203eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const uint8_t* const old_start = old_buf + mem->start_; 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem->mode_ == MEM_MODE_MAP); 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (data_size < mem->buf_size_) return 0; // can't remap to a shorter buffer! 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->buf_ = (uint8_t*)data; 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->end_ = mem->buf_size_ = data_size; 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 211eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch DoRemap(idec, mem->buf_ + mem->start_ - old_start); 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void InitMemBuffer(MemBuffer* const mem) { 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->mode_ = MEM_MODE_NONE; 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->buf_ = NULL; 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->buf_size_ = 0; 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->part0_buf_ = NULL; 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->part0_size_ = 0; 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void ClearMemBuffer(MemBuffer* const mem) { 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem); 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mem->mode_ == MEM_MODE_APPEND) { 2265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPSafeFree(mem->buf_); 2275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPSafeFree((void*)mem->part0_buf_); 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int CheckMemBufferMode(MemBuffer* const mem, MemBufferMode expected) { 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mem->mode_ == MEM_MODE_NONE) { 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->mode_ = expected; // switch to the expected mode 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (mem->mode_ != expected) { 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; // we mixed the modes => error 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem->mode_ == expected); // mode is ok 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// To be called last. 2425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static VP8StatusCode FinishDecoding(WebPIDecoder* const idec) { 2435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#if WEBP_DECODER_ABI_VERSION > 0x0203 2445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const WebPDecoderOptions* const options = idec->params_.options; 2455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPDecBuffer* const output = idec->params_.output; 2465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) idec->state_ = STATE_DONE; 2485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (options != NULL && options->flip) { 2495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return WebPFlipBuffer(output); 2505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#endif 2525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) idec->state_ = STATE_DONE; 2535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return VP8_STATUS_OK; 2545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 2555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Macroblock-decoding contexts 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void SaveContext(const VP8Decoder* dec, const VP8BitReader* token_br, 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MBContext* const context) { 2615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) context->left_ = dec->mb_info_[-1]; 2625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) context->info_ = dec->mb_info_[dec->mb_x_]; 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) context->token_br_ = *token_br; 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void RestoreContext(const MBContext* context, VP8Decoder* const dec, 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8BitReader* const token_br) { 2685f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dec->mb_info_[-1] = context->left_; 2695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dec->mb_info_[dec->mb_x_] = context->info_; 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *token_br = context->token_br_; 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode IDecError(WebPIDecoder* const idec, VP8StatusCode error) { 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_VP8_DATA) { 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Io* const io = &idec->io_; 2785d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (io->teardown != NULL) { 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) io->teardown(io); 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->state_ = STATE_ERROR; 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return error; 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void ChangeState(WebPIDecoder* const idec, DecState new_state, 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t consumed_bytes) { 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer* const mem = &idec->mem_; 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->state_ = new_state; 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->start_ += consumed_bytes; 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem->start_ <= mem->end_); 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.data = mem->buf_ + mem->start_; 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.data_size = MemDataSize(mem); 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Headers 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode DecodeWebPHeaders(WebPIDecoder* const idec) { 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer* const mem = &idec->mem_; 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* data = mem->buf_ + mem->start_; 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t curr_size = MemDataSize(mem); 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8StatusCode status; 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPHeaderStructure headers; 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) headers.data = data; 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) headers.data_size = curr_size; 3065f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) headers.have_all_data = 0; 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = WebPParseHeaders(&headers); 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (status == VP8_STATUS_NOT_ENOUGH_DATA) { 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; // We haven't found a VP8 chunk yet. 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (status != VP8_STATUS_OK) { 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, status); 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->chunk_size_ = headers.compressed_size; 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->is_lossless_ = headers.is_lossless; 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!idec->is_lossless_) { 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Decoder* const dec = VP8New(); 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (dec == NULL) { 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OUT_OF_MEMORY; 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->dec_ = dec; 3225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dec->alpha_data_ = headers.alpha_data; 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dec->alpha_data_size_ = headers.alpha_data_size; 3245d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) ChangeState(idec, STATE_VP8_HEADER, headers.offset); 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8LDecoder* const dec = VP8LNew(); 3275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (dec == NULL) { 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OUT_OF_MEMORY; 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->dec_ = dec; 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ChangeState(idec, STATE_VP8L_HEADER, headers.offset); 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OK; 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode DecodeVP8FrameHeader(WebPIDecoder* const idec) { 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* data = idec->mem_.buf_ + idec->mem_.start_; 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t curr_size = MemDataSize(&idec->mem_); 3395d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) int width, height; 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t bits; 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (curr_size < VP8_FRAME_HEADER_SIZE) { 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Not enough data bytes to extract VP8 Frame Header. 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3465d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!VP8GetInfo(data, curr_size, idec->chunk_size_, &width, &height)) { 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bits = data[0] | (data[1] << 8) | (data[2] << 16); 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->mem_.part0_size_ = (bits >> 5) + VP8_FRAME_HEADER_SIZE; 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.data = data; 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.data_size = curr_size; 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->state_ = STATE_VP8_PARTS0; 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OK; 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Partition #0 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int CopyParts0Data(WebPIDecoder* const idec) { 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8BitReader* const br = &dec->br_; 3635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t psize = br->buf_end_ - br->buf_; 3645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MemBuffer* const mem = &idec->mem_; 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(!idec->is_lossless_); 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(mem->part0_buf_ == NULL); 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(psize > 0); 3685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(psize <= mem->part0_size_); // Format limit: no need for runtime check 3695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mem->mode_ == MEM_MODE_APPEND) { 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We copy and grab ownership of the partition #0 data. 3715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint8_t* const part0_buf = (uint8_t*)WebPSafeMalloc(1ULL, psize); 3725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (part0_buf == NULL) { 3735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 3745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(part0_buf, br->buf_, psize); 3765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->part0_buf_ = part0_buf; 3775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) br->buf_ = part0_buf; 3785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) br->buf_end_ = part0_buf + psize; 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Else: just keep pointers to the partition #0's data in dec_->br_. 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mem->start_ += psize; 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 3845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode DecodePartition0(WebPIDecoder* const idec) { 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Io* const io = &idec->io_; 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPDecParams* const params = &idec->params_; 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecBuffer* const output = params->output; 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Wait till we have enough data for the whole partition #0 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (MemDataSize(&idec->mem_) < idec->mem_.part0_size_) { 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8GetHeaders(dec, io)) { 3985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const VP8StatusCode status = dec->status_; 3995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (status == VP8_STATUS_SUSPENDED || 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status == VP8_STATUS_NOT_ENOUGH_DATA) { 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // treating NOT_ENOUGH_DATA as SUSPENDED state 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, status); 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Allocate/Verify output buffer now 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dec->status_ = WebPAllocateDecBuffer(io->width, io->height, params->options, 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) output); 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (dec->status_ != VP8_STATUS_OK) { 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, dec->status_); 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4135d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // This change must be done before calling VP8InitFrame() 4145d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) dec->mt_method_ = VP8GetThreadMethod(params->options, NULL, 4155d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) io->width, io->height); 4165d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8InitDithering(params->options, dec); 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!CopyParts0Data(idec)) { 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, VP8_STATUS_OUT_OF_MEMORY); 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Finish setting up the decoding parameters. Will call io->setup(). 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (VP8EnterCritical(dec, io) != VP8_STATUS_OK) { 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, dec->status_); 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Note: past this point, teardown() must always be called 4275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // in case of error. 4285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->state_ = STATE_VP8_DATA; 4295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Allocate memory and prepare everything. 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8InitFrame(dec, io)) { 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, dec->status_); 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OK; 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Remaining partitions 4375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode DecodeRemaining(WebPIDecoder* const idec) { 4385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Decoder* const dec = (VP8Decoder*)idec->dec_; 4395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Io* const io = &idec->io_; 4405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(dec->ready_); 4425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (; dec->mb_y_ < dec->mb_h_; ++dec->mb_y_) { 4435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (idec->last_mb_y_ != dec->mb_y_) { 4445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!VP8ParseIntraModeRow(&dec->br_, dec)) { 4455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // note: normally, error shouldn't occur since we already have the whole 4465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // partition0 available here in DecodeRemaining(). Reaching EOF while 4475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // reading intra modes really means a BITSTREAM_ERROR. 4485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); 4495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 4505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) idec->last_mb_y_ = dec->mb_y_; 4515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 4525d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) for (; dec->mb_x_ < dec->mb_w_; ++dec->mb_x_) { 4535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) VP8BitReader* const token_br = 4545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) &dec->parts_[dec->mb_y_ & (dec->num_parts_ - 1)]; 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MBContext context; 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) SaveContext(dec, token_br, &context); 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8DecodeMB(dec, token_br)) { 4585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We shouldn't fail when MAX_MB data was available 4595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (dec->num_parts_ == 1 && MemDataSize(&idec->mem_) > MAX_MB_SIZE) { 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR); 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) RestoreContext(&context, dec, token_br); 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Release buffer only if there is only one partition 4665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (dec->num_parts_ == 1) { 4675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->mem_.start_ = token_br->buf_ - idec->mem_.buf_; 4685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(idec->mem_.start_ <= idec->mem_.end_); 4695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4715d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8InitScanline(dec); // Prepare for next scanline 4725d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 4735d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // Reconstruct, filter and emit the row. 4745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8ProcessRow(dec, io)) { 4755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, VP8_STATUS_USER_ABORT); 4765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Synchronize the thread and check for errors. 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8ExitCritical(dec, io)) { 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, VP8_STATUS_USER_ABORT); 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dec->ready_ = 0; 4835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return FinishDecoding(idec); 4845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4865d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)static VP8StatusCode ErrorStatusLossless(WebPIDecoder* const idec, 4875d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8StatusCode status) { 4885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (status == VP8_STATUS_SUSPENDED || status == VP8_STATUS_NOT_ENOUGH_DATA) { 4895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 4905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, status); 4925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode DecodeVP8LHeader(WebPIDecoder* const idec) { 4955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8Io* const io = &idec->io_; 4965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; 4975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPDecParams* const params = &idec->params_; 4985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecBuffer* const output = params->output; 4995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t curr_size = MemDataSize(&idec->mem_); 5005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(idec->is_lossless_); 5015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Wait until there's enough data for decoding header. 5035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (curr_size < (idec->chunk_size_ >> 3)) { 5045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 5055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8LDecodeHeader(dec, io)) { 5075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ErrorStatusLossless(idec, dec->status_); 5085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Allocate/verify output buffer now. 5105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dec->status_ = WebPAllocateDecBuffer(io->width, io->height, params->options, 5115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) output); 5125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (dec->status_ != VP8_STATUS_OK) { 5135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecError(idec, dec->status_); 5145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->state_ = STATE_VP8L_DATA; 5175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OK; 5185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode DecodeVP8LData(WebPIDecoder* const idec) { 5215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8LDecoder* const dec = (VP8LDecoder*)idec->dec_; 5225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t curr_size = MemDataSize(&idec->mem_); 5235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(idec->is_lossless_); 5245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // At present Lossless decoder can't decode image incrementally. So wait till 5265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // all the image data is aggregated before image can be decoded. 5275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (curr_size < idec->chunk_size_) { 5285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 5295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!VP8LDecodeImage(dec)) { 5325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ErrorStatusLossless(idec, dec->status_); 5335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return FinishDecoding(idec); 5365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Main decoding loop 5395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode IDecode(WebPIDecoder* idec) { 5405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8StatusCode status = VP8_STATUS_SUSPENDED; 5415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5425d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (idec->state_ == STATE_WEBP_HEADER) { 5435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = DecodeWebPHeaders(idec); 5445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 5455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->dec_ == NULL) { 5465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; // can't continue if we have no decoder. 5475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5495d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (idec->state_ == STATE_VP8_HEADER) { 5505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = DecodeVP8FrameHeader(idec); 5515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_VP8_PARTS0) { 5535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = DecodePartition0(idec); 5545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_VP8_DATA) { 5565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = DecodeRemaining(idec); 5575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_VP8L_HEADER) { 5595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = DecodeVP8LHeader(idec); 5605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_VP8L_DATA) { 5625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = DecodeVP8LData(idec); 5635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return status; 5655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 5685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Public functions 5695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer) { 5715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPIDecoder* idec = (WebPIDecoder*)WebPSafeCalloc(1ULL, sizeof(*idec)); 5725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL) { 5735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 5745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5765d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) idec->state_ = STATE_WEBP_HEADER; 5775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->chunk_size_ = 0; 5785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) idec->last_mb_y_ = -1; 5805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 5815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) InitMemBuffer(&idec->mem_); 5825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPInitDecBuffer(&idec->output_); 5835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8InitIo(&idec->io_); 5845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPResetDecParams(&idec->params_); 5865d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) idec->params_.output = (output_buffer != NULL) ? output_buffer 5875d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) : &idec->output_; 5885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPInitCustomIo(&idec->params_, &idec->io_); // Plug the I/O functions. 5895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return idec; 5915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size, 5945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecoderConfig* config) { 5955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPIDecoder* idec; 5965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Parse the bitstream's features, if requested: 5985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (data != NULL && data_size > 0 && config != NULL) { 5995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (WebPGetFeatures(data, data_size, &config->input) != VP8_STATUS_OK) { 6005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 6015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Create an instance of the incremental decoder 6045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec = WebPINewDecoder(config ? &config->output : NULL); 6055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL) { 6065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 6075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Finish initialization 6095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (config != NULL) { 6105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->params_.options = &config->options; 6115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return idec; 6135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WebPIDelete(WebPIDecoder* idec) { 6165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL) return; 6175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->dec_ != NULL) { 6185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!idec->is_lossless_) { 619d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) if (idec->state_ == STATE_VP8_DATA) { 620d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) // Synchronize the thread, clean-up and check for errors. 6215d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8ExitCritical((VP8Decoder*)idec->dec_, &idec->io_); 622d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) } 6235d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8Delete((VP8Decoder*)idec->dec_); 6245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 6255d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VP8LDelete((VP8LDecoder*)idec->dec_); 6265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ClearMemBuffer(&idec->mem_); 6295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPFreeDecBuffer(&idec->output_); 6305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPSafeFree(idec); 6315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 6345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Wrapper toward WebPINewDecoder 6355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WebPIDecoder* WebPINewRGB(WEBP_CSP_MODE mode, uint8_t* output_buffer, 6375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t output_buffer_size, int output_stride) { 6382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int is_external_memory = (output_buffer != NULL); 6395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPIDecoder* idec; 6402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 6415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mode >= MODE_YUV) return NULL; 6422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!is_external_memory) { // Overwrite parameters to sane values. 6432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) output_buffer_size = 0; 6442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) output_stride = 0; 6452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } else { // A buffer was passed. Validate the other params. 6462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (output_stride == 0 || output_buffer_size == 0) { 6472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return NULL; // invalid parameter. 6482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 6492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 6505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec = WebPINewDecoder(NULL); 6515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL) return NULL; 6525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.colorspace = mode; 6532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) idec->output_.is_external_memory = is_external_memory; 6545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.RGBA.rgba = output_buffer; 6555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.RGBA.stride = output_stride; 6565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.RGBA.size = output_buffer_size; 6575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return idec; 6585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WebPIDecoder* WebPINewYUVA(uint8_t* luma, size_t luma_size, int luma_stride, 6615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* u, size_t u_size, int u_stride, 6625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* v, size_t v_size, int v_stride, 6635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* a, size_t a_size, int a_stride) { 6642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const int is_external_memory = (luma != NULL); 6652a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) WebPIDecoder* idec; 6662a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) WEBP_CSP_MODE colorspace; 6672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 6682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!is_external_memory) { // Overwrite parameters to sane values. 6692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) luma_size = u_size = v_size = a_size = 0; 6702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) luma_stride = u_stride = v_stride = a_stride = 0; 6712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) u = v = a = NULL; 6722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) colorspace = MODE_YUVA; 6732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } else { // A luma buffer was passed. Validate the other parameters. 6742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (u == NULL || v == NULL) return NULL; 6752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (luma_size == 0 || u_size == 0 || v_size == 0) return NULL; 6762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (luma_stride == 0 || u_stride == 0 || v_stride == 0) return NULL; 6772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (a != NULL) { 6782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (a_size == 0 || a_stride == 0) return NULL; 6792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 6802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) colorspace = (a == NULL) ? MODE_YUV : MODE_YUVA; 6812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 6822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 6832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) idec = WebPINewDecoder(NULL); 6845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL) return NULL; 6852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 6862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) idec->output_.colorspace = colorspace; 6872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) idec->output_.is_external_memory = is_external_memory; 6885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.y = luma; 6895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.y_stride = luma_stride; 6905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.y_size = luma_size; 6915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.u = u; 6925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.u_stride = u_stride; 6935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.u_size = u_size; 6945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.v = v; 6955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.v_stride = v_stride; 6965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.v_size = v_size; 6975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.a = a; 6985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.a_stride = a_stride; 6995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->output_.u.YUVA.a_size = a_size; 7005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return idec; 7015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)WebPIDecoder* WebPINewYUV(uint8_t* luma, size_t luma_size, int luma_stride, 7045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* u, size_t u_size, int u_stride, 7055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* v, size_t v_size, int v_stride) { 7065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return WebPINewYUVA(luma, luma_size, luma_stride, 7075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) u, u_size, u_stride, 7085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) v, v_size, v_stride, 7095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NULL, 0, 0); 7105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 7135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode IDecCheckStatus(const WebPIDecoder* const idec) { 7155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) assert(idec); 7165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_ERROR) { 7175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_BITSTREAM_ERROR; 7185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ == STATE_DONE) { 7205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OK; 7215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_SUSPENDED; 7235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)VP8StatusCode WebPIAppend(WebPIDecoder* idec, 7265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* data, size_t data_size) { 7275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8StatusCode status; 7285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL || data == NULL) { 7295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 7305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = IDecCheckStatus(idec); 7325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (status != VP8_STATUS_SUSPENDED) { 7335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return status; 7345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Check mixed calls between RemapMemBuffer and AppendToMemBuffer. 7365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!CheckMemBufferMode(&idec->mem_, MEM_MODE_APPEND)) { 7375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 7385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Append data to memory buffer 7405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!AppendToMemBuffer(idec, data, data_size)) { 7415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OUT_OF_MEMORY; 7425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecode(idec); 7445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)VP8StatusCode WebPIUpdate(WebPIDecoder* idec, 7475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8_t* data, size_t data_size) { 7485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8StatusCode status; 7495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL || data == NULL) { 7505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 7515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) status = IDecCheckStatus(idec); 7535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (status != VP8_STATUS_SUSPENDED) { 7545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return status; 7555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Check mixed calls between RemapMemBuffer and AppendToMemBuffer. 7575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!CheckMemBufferMode(&idec->mem_, MEM_MODE_MAP)) { 7585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 7595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Make the memory buffer point to the new buffer 7615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!RemapMemBuffer(idec, data, data_size)) { 7625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 7635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IDecode(idec); 7655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 7685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const WebPDecBuffer* GetOutputBuffer(const WebPIDecoder* const idec) { 7705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec == NULL || idec->dec_ == NULL) { 7715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 7725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (idec->state_ <= STATE_VP8_PARTS0) { 7745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 7755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return idec->params_.output; 7775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const WebPDecBuffer* WebPIDecodedArea(const WebPIDecoder* idec, 7805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* left, int* top, 7815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* width, int* height) { 7825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPDecBuffer* const src = GetOutputBuffer(idec); 7835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (left != NULL) *left = 0; 7845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (top != NULL) *top = 0; 7855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(skal): later include handling of rotations. 7865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src) { 7875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width != NULL) *width = src->width; 7885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height != NULL) *height = idec->params_.last_y; 7895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 7905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width != NULL) *width = 0; 7915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height != NULL) *height = 0; 7925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return src; 7945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 7955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint8_t* WebPIDecGetRGB(const WebPIDecoder* idec, int* last_y, 7975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* width, int* height, int* stride) { 7985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPDecBuffer* const src = GetOutputBuffer(idec); 7995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src == NULL) return NULL; 8005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src->colorspace >= MODE_YUV) { 8015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 8025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (last_y != NULL) *last_y = idec->params_.last_y; 8055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width != NULL) *width = src->width; 8065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height != NULL) *height = src->height; 8075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (stride != NULL) *stride = src->u.RGBA.stride; 8085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return src->u.RGBA.rgba; 8105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint8_t* WebPIDecGetYUVA(const WebPIDecoder* idec, int* last_y, 8135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t** u, uint8_t** v, uint8_t** a, 8145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* width, int* height, 8155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* stride, int* uv_stride, int* a_stride) { 8165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPDecBuffer* const src = GetOutputBuffer(idec); 8175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src == NULL) return NULL; 8185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src->colorspace < MODE_YUV) { 8195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 8205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (last_y != NULL) *last_y = idec->params_.last_y; 8235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (u != NULL) *u = src->u.YUVA.u; 8245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (v != NULL) *v = src->u.YUVA.v; 8255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (a != NULL) *a = src->u.YUVA.a; 8265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (width != NULL) *width = src->width; 8275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (height != NULL) *height = src->height; 8285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (stride != NULL) *stride = src->u.YUVA.y_stride; 8295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (uv_stride != NULL) *uv_stride = src->u.YUVA.u_stride; 8305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (a_stride != NULL) *a_stride = src->u.YUVA.a_stride; 8315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return src->u.YUVA.y; 8335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int WebPISetIOHooks(WebPIDecoder* const idec, 8365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8IoPutHook put, 8375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8IoSetupHook setup, 8385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VP8IoTeardownHook teardown, 8395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void* user_data) { 8405d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (idec == NULL || idec->state_ > STATE_WEBP_HEADER) { 8415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 8425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.put = put; 8455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.setup = setup; 8465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.teardown = teardown; 8475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) idec->io_.opaque = user_data; 8485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 8505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 8515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 852