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/*
* Copyright (c) 2001-2016, 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_AOM_DSP_ENTENC_H_
#define AOM_AOM_DSP_ENTENC_H_
#include <stddef.h>
#include "aom_dsp/entcode.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct od_ec_enc od_ec_enc;
#define OD_MEASURE_EC_OVERHEAD (0)
/*The entropy encoder context.*/
struct od_ec_enc {
/*Buffered output.
This contains only the raw bits until the final call to od_ec_enc_done(),
where all the arithmetic-coded data gets prepended to it.*/
unsigned char *buf;
/*The size of the buffer.*/
uint32_t storage;
/*A buffer for output bytes with their associated carry flags.*/
uint16_t *precarry_buf;
/*The size of the pre-carry buffer.*/
uint32_t precarry_storage;
/*The offset at which the next entropy-coded byte will be written.*/
uint32_t offs;
/*The low end of the current range.*/
od_ec_window low;
/*The number of values in the current range.*/
uint16_t rng;
/*The number of bits of data in the current value.*/
int16_t cnt;
/*Nonzero if an error occurred.*/
int error;
#if OD_MEASURE_EC_OVERHEAD
double entropy;
int nb_symbols;
#endif
};
/*See entenc.c for further documentation.*/
void od_ec_enc_init(od_ec_enc *enc, uint32_t size) OD_ARG_NONNULL(1);
void od_ec_enc_reset(od_ec_enc *enc) OD_ARG_NONNULL(1);
void od_ec_enc_clear(od_ec_enc *enc) OD_ARG_NONNULL(1);
void od_ec_encode_bool_q15(od_ec_enc *enc, int val, unsigned f_q15)
OD_ARG_NONNULL(1);
void od_ec_encode_cdf_q15(od_ec_enc *enc, int s, const uint16_t *cdf, int nsyms)
OD_ARG_NONNULL(1) OD_ARG_NONNULL(3);
void od_ec_enc_bits(od_ec_enc *enc, uint32_t fl, unsigned ftb)
OD_ARG_NONNULL(1);
void od_ec_enc_patch_initial_bits(od_ec_enc *enc, unsigned val, int nbits)
OD_ARG_NONNULL(1);
OD_WARN_UNUSED_RESULT unsigned char *od_ec_enc_done(od_ec_enc *enc,
uint32_t *nbytes)
OD_ARG_NONNULL(1) OD_ARG_NONNULL(2);
OD_WARN_UNUSED_RESULT int od_ec_enc_tell(const od_ec_enc *enc)
OD_ARG_NONNULL(1);
OD_WARN_UNUSED_RESULT uint32_t od_ec_enc_tell_frac(const od_ec_enc *enc)
OD_ARG_NONNULL(1);
void od_ec_enc_checkpoint(od_ec_enc *dst, const od_ec_enc *src);
void od_ec_enc_rollback(od_ec_enc *dst, const od_ec_enc *src);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // AOM_AOM_DSP_ENTENC_H_
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