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93 lines
3 KiB
C
93 lines
3 KiB
C
#ifndef CABAC_H_
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#define CABAC_H_
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/**
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* \file
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* \brief The Content Adaptive Binary Arithmetic Coder (CABAC).
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*
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* \author Marko Viitanen ( fador@iki.fi ),
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* Tampere University of Technology,
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* Department of Pervasive Computing.
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* \author Ari Koivula ( ari@koivu.la ),
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* Tampere University of Technology,
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* Department of Pervasive Computing.
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*/
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#include "global.h"
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#include "bitstream.h"
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#include "context.h"
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// Types
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typedef struct
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{
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cabac_ctx *ctx;
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uint32_t low;
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uint32_t range;
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uint32_t buffered_byte;
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int32_t num_buffered_bytes;
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int32_t bits_left;
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bitstream *stream;
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} cabac_data;
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// Globals
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extern const uint8_t g_auc_next_state_mps[128];
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extern const uint8_t g_auc_next_state_lps[128];
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extern const uint8_t g_auc_lpst_table[64][4];
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extern const uint8_t g_auc_renorm_table[32];
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extern cabac_data cabac;
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// Functions
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void cabac_start(cabac_data *data);
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void cabac_encode_bin(cabac_data *data, uint32_t bin_value);
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void cabac_encode_bin_ep(cabac_data *data, uint32_t bin_value);
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void cabac_encode_bins_ep(cabac_data *data, uint32_t bin_values, int num_bins);
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void cabac_encode_bin_trm(cabac_data *data, uint8_t bin_value);
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void cabac_write(cabac_data *data);
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void cabac_finish(cabac_data *data);
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void cabac_flush(cabac_data *data);
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void cabac_write_coeff_remain(cabac_data *cabac, uint32_t symbol,
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uint32_t r_param);
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void cabac_write_ep_ex_golomb(cabac_data *data, uint32_t symbol,
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uint32_t count);
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void cabac_write_unary_max_symbol(cabac_data *data, cabac_ctx *ctx,
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uint32_t symbol, int32_t offset,
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uint32_t max_symbol);
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// Macros
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#define CTX_STATE(ctx) (ctx->uc_state >> 1)
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#define CTX_MPS(ctx) (ctx->uc_state & 1)
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#define CTX_UPDATE_LPS(ctx) { (ctx)->uc_state = g_auc_next_state_lps[ (ctx)->uc_state ]; }
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#define CTX_UPDATE_MPS(ctx) { (ctx)->uc_state = g_auc_next_state_mps[ (ctx)->uc_state ]; }
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#ifdef VERBOSE
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#define CABAC_BIN(data, value, name) { \
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uint32_t prev_state = (data)->ctx->uc_state; \
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cabac_encode_bin(data, value); \
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printf("%s = %d prev_state=%d state=%d\n", \
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name, value, prev_state, (data)->ctx->uc_state); }
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#define CABAC_BINS_EP(data, value, bins, name) { \
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uint32_t prev_state = (data)->ctx->uc_state; \
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cabac_encode_bins_ep(data, value, bins); \
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printf("%s = %d prev_state=%d state=%d\n", \
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name, value, prev_state, (data)->ctx->uc_state); }
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#define CABAC_BIN_EP(data, value, name) { \
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uint32_t prev_state = (data)->ctx->uc_state; \
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cabac_encode_bin_ep(data, value); \
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printf("%s = %d prev_state=%d state=%d\n", \
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name, value, prev_state, (data)->ctx->uc_state); }
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#else
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#define CABAC_BIN(data, value, name) \
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cabac_encode_bin(data, value);
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#define CABAC_BINS_EP(data, value, bins, name) \
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cabac_encode_bins_ep(data, value, bins);
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#define CABAC_BIN_EP(data, value, name) \
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cabac_encode_bin_ep(data, value);
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#endif
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#endif
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