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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_BITREADER_H_
#define AOM_DSP_BITREADER_H_
#include <assert.h>
#include <limits.h>
#include "./aom_config.h"
#include "aom/aomdx.h"
#include "aom/aom_integer.h"
#if CONFIG_ANS
#include "aom_dsp/ansreader.h"
#else
#include "aom_dsp/daalaboolreader.h"
#endif
#include "aom_dsp/prob.h"
#include "av1/common/odintrin.h"
#if CONFIG_ACCOUNTING
#include "av1/decoder/accounting.h"
#define ACCT_STR_NAME acct_str
#define ACCT_STR_PARAM , const char *ACCT_STR_NAME
#define ACCT_STR_ARG(s) , s
#else
#define ACCT_STR_PARAM
#define ACCT_STR_ARG(s)
#endif
#define aom_read(r, prob, ACCT_STR_NAME) \
aom_read_(r, prob ACCT_STR_ARG(ACCT_STR_NAME))
#define aom_read_bit(r, ACCT_STR_NAME) \
aom_read_bit_(r ACCT_STR_ARG(ACCT_STR_NAME))
#define aom_read_tree(r, tree, probs, ACCT_STR_NAME) \
aom_read_tree_(r, tree, probs ACCT_STR_ARG(ACCT_STR_NAME))
#define aom_read_literal(r, bits, ACCT_STR_NAME) \
aom_read_literal_(r, bits ACCT_STR_ARG(ACCT_STR_NAME))
#define aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME) \
aom_read_cdf_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME))
#define aom_read_symbol(r, cdf, nsymbs, ACCT_STR_NAME) \
aom_read_symbol_(r, cdf, nsymbs ACCT_STR_ARG(ACCT_STR_NAME))
#ifdef __cplusplus
extern "C" {
#endif
#if CONFIG_ANS
typedef struct AnsDecoder aom_reader;
#else
typedef struct daala_reader aom_reader;
#endif
static INLINE int aom_reader_init(aom_reader *r, const uint8_t *buffer,
size_t size, aom_decrypt_cb decrypt_cb,
void *decrypt_state) {
(void)decrypt_cb;
(void)decrypt_state;
#if CONFIG_ANS
if (size > INT_MAX) return 1;
return ans_read_init(r, buffer, (int)size);
#else
return aom_daala_reader_init(r, buffer, (int)size);
#endif
}
static INLINE const uint8_t *aom_reader_find_end(aom_reader *r) {
#if CONFIG_ANS
(void)r;
assert(0 && "Use the raw buffer size with ANS");
return NULL;
#else
return aom_daala_reader_find_end(r);
#endif
}
static INLINE int aom_reader_has_error(aom_reader *r) {
#if CONFIG_ANS
return ans_reader_has_error(r);
#else
return aom_daala_reader_has_error(r);
#endif
}
// Returns the position in the bit reader in bits.
static INLINE uint32_t aom_reader_tell(const aom_reader *r) {
#if CONFIG_ANS
(void)r;
assert(0 && "aom_reader_tell() is unimplemented for ANS");
return 0;
#else
return aom_daala_reader_tell(r);
#endif
}
// Returns the position in the bit reader in 1/8th bits.
static INLINE uint32_t aom_reader_tell_frac(const aom_reader *r) {
#if CONFIG_ANS
(void)r;
assert(0 && "aom_reader_tell_frac() is unimplemented for ANS");
return 0;
#else
return aom_daala_reader_tell_frac(r);
#endif
}
#if CONFIG_ACCOUNTING
static INLINE void aom_process_accounting(const aom_reader *r ACCT_STR_PARAM) {
if (r->accounting != NULL) {
uint32_t tell_frac;
tell_frac = aom_reader_tell_frac(r);
aom_accounting_record(r->accounting, ACCT_STR_NAME,
tell_frac - r->accounting->last_tell_frac);
r->accounting->last_tell_frac = tell_frac;
}
}
static INLINE void aom_update_symb_counts(const aom_reader *r, int is_binary) {
if (r->accounting != NULL) {
r->accounting->syms.num_multi_syms += !is_binary;
r->accounting->syms.num_binary_syms += !!is_binary;
}
}
#endif
static INLINE int aom_read_(aom_reader *r, int prob ACCT_STR_PARAM) {
int ret;
#if CONFIG_ANS
ret = rabs_read(r, prob);
#else
ret = aom_daala_read(r, prob);
#endif
#if CONFIG_ACCOUNTING
if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
aom_update_symb_counts(r, 1);
#endif
return ret;
}
static INLINE int aom_read_bit_(aom_reader *r ACCT_STR_PARAM) {
int ret;
#if CONFIG_ANS
ret = rabs_read_bit(r); // Non trivial optimization at half probability
#elif CONFIG_RAWBITS
// Note this uses raw bits and is not the same as aom_daala_read(r, 128);
// Calls to this function are omitted from raw symbol accounting.
ret = aom_daala_read_bit(r);
#else
ret = aom_read(r, 128, NULL); // aom_prob_half
#endif
#if CONFIG_ACCOUNTING
if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
#endif
return ret;
}
static INLINE int aom_read_literal_(aom_reader *r, int bits ACCT_STR_PARAM) {
int literal = 0, bit;
for (bit = bits - 1; bit >= 0; bit--) literal |= aom_read_bit(r, NULL) << bit;
#if CONFIG_ACCOUNTING
if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
#endif
return literal;
}
static INLINE int aom_read_cdf_(aom_reader *r, const aom_cdf_prob *cdf,
int nsymbs ACCT_STR_PARAM) {
int ret;
#if CONFIG_ANS
(void)nsymbs;
ret = rans_read(r, cdf);
#else
ret = daala_read_symbol(r, cdf, nsymbs);
#endif
#if CONFIG_ACCOUNTING
if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
aom_update_symb_counts(r, (nsymbs == 2));
#endif
return ret;
}
static INLINE int aom_read_symbol_(aom_reader *r, aom_cdf_prob *cdf,
int nsymbs ACCT_STR_PARAM) {
int ret;
ret = aom_read_cdf(r, cdf, nsymbs, ACCT_STR_NAME);
update_cdf(cdf, ret, nsymbs);
return ret;
}
static INLINE int aom_read_tree_as_cdf(aom_reader *r,
const aom_tree_index *tree,
const aom_prob *probs) {
aom_tree_index i = 0;
do {
aom_cdf_prob cdf[16];
aom_tree_index index[16];
int path[16];
int dist[16];
int nsymbs;
int symb;
nsymbs = tree_to_cdf(tree, probs, i, cdf, index, path, dist);
symb = aom_read_cdf(r, cdf, nsymbs, NULL);
OD_ASSERT(symb >= 0 && symb < nsymbs);
i = index[symb];
} while (i > 0);
return -i;
}
static INLINE int aom_read_tree_(aom_reader *r, const aom_tree_index *tree,
const aom_prob *probs ACCT_STR_PARAM) {
int ret;
ret = aom_read_tree_as_cdf(r, tree, probs);
#if CONFIG_ACCOUNTING
if (ACCT_STR_NAME) aom_process_accounting(r, ACCT_STR_NAME);
#endif
return ret;
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_DSP_BITREADER_H_
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