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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#ifndef AOM_DSP_BITWRITER_H_
#define AOM_DSP_BITWRITER_H_
#include <assert.h>
#include "./aom_config.h"
#if CONFIG_ANS
#include "aom_dsp/buf_ans.h"
#else
#include "aom_dsp/daalaboolwriter.h"
#endif
#include "aom_dsp/prob.h"
#if CONFIG_RD_DEBUG
#include "av1/common/blockd.h"
#include "av1/encoder/cost.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if CONFIG_ANS
typedef struct BufAnsCoder aom_writer;
#else
typedef struct daala_writer aom_writer;
#endif
typedef struct TOKEN_STATS {
int cost;
#if CONFIG_VAR_TX
#if CONFIG_RD_DEBUG
int txb_coeff_cost_map[TXB_COEFF_COST_MAP_SIZE][TXB_COEFF_COST_MAP_SIZE];
#endif
#endif
} TOKEN_STATS;
static INLINE void init_token_stats(TOKEN_STATS *token_stats) {
#if CONFIG_VAR_TX
#if CONFIG_RD_DEBUG
int r, c;
for (r = 0; r < TXB_COEFF_COST_MAP_SIZE; ++r) {
for (c = 0; c < TXB_COEFF_COST_MAP_SIZE; ++c) {
token_stats->txb_coeff_cost_map[r][c] = 0;
}
}
#endif
#endif
token_stats->cost = 0;
}
static INLINE void aom_start_encode(aom_writer *bc, uint8_t *buffer) {
#if CONFIG_ANS
(void)bc;
(void)buffer;
assert(0 && "buf_ans requires a more complicated startup procedure");
#else
aom_daala_start_encode(bc, buffer);
#endif
}
static INLINE void aom_stop_encode(aom_writer *bc) {
#if CONFIG_ANS
(void)bc;
assert(0 && "buf_ans requires a more complicated shutdown procedure");
#else
aom_daala_stop_encode(bc);
#endif
}
static INLINE void aom_write(aom_writer *br, int bit, int probability) {
#if CONFIG_ANS
buf_rabs_write(br, bit, probability);
#else
aom_daala_write(br, bit, probability);
#endif
}
static INLINE void aom_write_record(aom_writer *br, int bit, int probability,
TOKEN_STATS *token_stats) {
aom_write(br, bit, probability);
#if CONFIG_RD_DEBUG
token_stats->cost += av1_cost_bit(probability, bit);
#else
(void)token_stats;
#endif
}
static INLINE void aom_write_bit(aom_writer *w, int bit) {
#if CONFIG_ANS
buf_rabs_write_bit(w, bit);
#elif CONFIG_RAWBITS
// Note this uses raw bits and is not the same as aom_daala_write(r, 128);
aom_daala_write_bit(w, bit);
#else
aom_write(w, bit, 128); // aom_prob_half
#endif
}
static INLINE void aom_write_bit_record(aom_writer *w, int bit,
TOKEN_STATS *token_stats) {
aom_write_bit(w, bit);
#if CONFIG_RD_DEBUG
token_stats->cost += av1_cost_bit(128, bit); // aom_prob_half
#else
(void)token_stats;
#endif
}
static INLINE void aom_write_literal(aom_writer *w, int data, int bits) {
int bit;
for (bit = bits - 1; bit >= 0; bit--) aom_write_bit(w, 1 & (data >> bit));
}
static INLINE void aom_write_cdf(aom_writer *w, int symb,
const aom_cdf_prob *cdf, int nsymbs) {
#if CONFIG_ANS
(void)nsymbs;
assert(cdf);
const aom_cdf_prob cum_prob = symb > 0 ? cdf[symb - 1] : 0;
const aom_cdf_prob prob = cdf[symb] - cum_prob;
buf_rans_write(w, cum_prob, prob);
#else
daala_write_symbol(w, symb, cdf, nsymbs);
#endif
}
static INLINE void aom_write_symbol(aom_writer *w, int symb, aom_cdf_prob *cdf,
int nsymbs) {
aom_write_cdf(w, symb, cdf, nsymbs);
update_cdf(cdf, symb, nsymbs);
}
static INLINE void aom_write_tree_as_cdf(aom_writer *w,
const aom_tree_index *tree,
const aom_prob *probs, int bits,
int len, aom_tree_index i) {
aom_tree_index root;
root = i;
do {
aom_cdf_prob cdf[16];
aom_tree_index index[16];
int path[16];
int dist[16];
int nsymbs;
int symb;
int j;
/* Compute the CDF of the binary tree using the given probabilities. */
nsymbs = tree_to_cdf(tree, probs, root, cdf, index, path, dist);
/* Find the symbol to code. */
symb = -1;
for (j = 0; j < nsymbs; j++) {
/* If this symbol codes a leaf node, */
if (index[j] <= 0) {
if (len == dist[j] && path[j] == bits) {
symb = j;
break;
}
} else {
if (len > dist[j] && path[j] == bits >> (len - dist[j])) {
symb = j;
break;
}
}
}
OD_ASSERT(symb != -1);
aom_write_cdf(w, symb, cdf, nsymbs);
bits &= (1 << (len - dist[symb])) - 1;
len -= dist[symb];
} while (len);
}
static INLINE void aom_write_tree(aom_writer *w, const aom_tree_index *tree,
const aom_prob *probs, int bits, int len,
aom_tree_index i) {
aom_write_tree_as_cdf(w, tree, probs, bits, len, i);
}
static INLINE void aom_write_tree_record(aom_writer *w,
const aom_tree_index *tree,
const aom_prob *probs, int bits,
int len, aom_tree_index i,
TOKEN_STATS *token_stats) {
(void)token_stats;
aom_write_tree_as_cdf(w, tree, probs, bits, len, i);
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_DSP_BITWRITER_H_
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