/* Copyright 2015 Google Inc. All Rights Reserved. | |
Distributed under MIT license. | |
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT | |
*/ | |
/* Algorithms for distributing the literals and commands of a metablock between | |
block types and contexts. */ | |
#ifndef BROTLI_ENC_METABLOCK_H_ | |
#define BROTLI_ENC_METABLOCK_H_ | |
#include "../common/types.h" | |
#include "./block_splitter.h" | |
#include "./command.h" | |
#include "./context.h" | |
#include "./histogram.h" | |
#include "./memory.h" | |
#include "./port.h" | |
#include "./quality.h" | |
#if defined(__cplusplus) || defined(c_plusplus) | |
extern "C" { | |
#endif | |
typedef struct MetaBlockSplit { | |
BlockSplit literal_split; | |
BlockSplit command_split; | |
BlockSplit distance_split; | |
uint32_t* literal_context_map; | |
size_t literal_context_map_size; | |
uint32_t* distance_context_map; | |
size_t distance_context_map_size; | |
HistogramLiteral* literal_histograms; | |
size_t literal_histograms_size; | |
HistogramCommand* command_histograms; | |
size_t command_histograms_size; | |
HistogramDistance* distance_histograms; | |
size_t distance_histograms_size; | |
} MetaBlockSplit; | |
static BROTLI_INLINE void InitMetaBlockSplit(MetaBlockSplit* mb) { | |
BrotliInitBlockSplit(&mb->literal_split); | |
BrotliInitBlockSplit(&mb->command_split); | |
BrotliInitBlockSplit(&mb->distance_split); | |
mb->literal_context_map = 0; | |
mb->literal_context_map_size = 0; | |
mb->distance_context_map = 0; | |
mb->distance_context_map_size = 0; | |
mb->literal_histograms = 0; | |
mb->literal_histograms_size = 0; | |
mb->command_histograms = 0; | |
mb->command_histograms_size = 0; | |
mb->distance_histograms = 0; | |
mb->distance_histograms_size = 0; | |
} | |
static BROTLI_INLINE void DestroyMetaBlockSplit( | |
MemoryManager* m, MetaBlockSplit* mb) { | |
BrotliDestroyBlockSplit(m, &mb->literal_split); | |
BrotliDestroyBlockSplit(m, &mb->command_split); | |
BrotliDestroyBlockSplit(m, &mb->distance_split); | |
BROTLI_FREE(m, mb->literal_context_map); | |
BROTLI_FREE(m, mb->distance_context_map); | |
BROTLI_FREE(m, mb->literal_histograms); | |
BROTLI_FREE(m, mb->command_histograms); | |
BROTLI_FREE(m, mb->distance_histograms); | |
} | |
/* Uses the slow shortest-path block splitter and does context clustering. */ | |
BROTLI_INTERNAL void BrotliBuildMetaBlock(MemoryManager* m, | |
const uint8_t* ringbuffer, | |
const size_t pos, | |
const size_t mask, | |
const BrotliEncoderParams* params, | |
uint8_t prev_byte, | |
uint8_t prev_byte2, | |
const Command* cmds, | |
size_t num_commands, | |
ContextType literal_context_mode, | |
MetaBlockSplit* mb); | |
/* Uses a fast greedy block splitter that tries to merge current block with the | |
last or the second last block and does not do any context modeling. */ | |
BROTLI_INTERNAL void BrotliBuildMetaBlockGreedy(MemoryManager* m, | |
const uint8_t* ringbuffer, | |
size_t pos, | |
size_t mask, | |
const Command* commands, | |
size_t n_commands, | |
MetaBlockSplit* mb); | |
/* Uses a fast greedy block splitter that tries to merge current block with the | |
last or the second last block and uses a static context clustering which | |
is the same for all block types. */ | |
BROTLI_INTERNAL void BrotliBuildMetaBlockGreedyWithContexts( | |
MemoryManager* m, const uint8_t* ringbuffer, size_t pos, size_t mask, | |
uint8_t prev_byte, uint8_t prev_byte2, ContextType literal_context_mode, | |
size_t num_contexts, const uint32_t* static_context_map, | |
const Command* commands, size_t n_commands, MetaBlockSplit* mb); | |
BROTLI_INTERNAL void BrotliOptimizeHistograms(size_t num_direct_distance_codes, | |
size_t distance_postfix_bits, | |
MetaBlockSplit* mb); | |
#if defined(__cplusplus) || defined(c_plusplus) | |
} /* extern "C" */ | |
#endif | |
#endif /* BROTLI_ENC_METABLOCK_H_ */ |