mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
373ee2c618
Mostly used the RFC document, the decoding functions and the reference encoder's implmenentation as a reference. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 2012 Andrew D'Addesio
|
|
* Copyright (c) 2013-2014 Mozilla Corporation
|
|
* Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_OPUS_RC_H
|
|
#define AVCODEC_OPUS_RC_H
|
|
|
|
#include <stdint.h>
|
|
#include "get_bits.h"
|
|
|
|
#define OPUS_MAX_PACKET_SIZE 1275
|
|
|
|
#define opus_ilog(i) (av_log2(i) + !!(i))
|
|
|
|
typedef struct RawBitsContext {
|
|
const uint8_t *position;
|
|
uint32_t bytes;
|
|
uint32_t cachelen;
|
|
uint32_t cacheval;
|
|
} RawBitsContext;
|
|
|
|
typedef struct OpusRangeCoder {
|
|
GetBitContext gb;
|
|
RawBitsContext rb;
|
|
uint32_t range;
|
|
uint32_t value;
|
|
uint32_t total_bits;
|
|
|
|
/* Encoder */
|
|
uint8_t buf[OPUS_MAX_PACKET_SIZE + 12]; /* memcpy vs (memmove + overreading) */
|
|
uint8_t *rng_cur; /* Current range coded byte */
|
|
int ext; /* Awaiting propagation */
|
|
int rem; /* Carryout flag */
|
|
|
|
/* Encoding stats */
|
|
int waste;
|
|
} OpusRangeCoder;
|
|
|
|
/**
|
|
* CELT: estimate bits of entropy that have thus far been consumed for the
|
|
* current CELT frame, to integer and fractional (1/8th bit) precision
|
|
*/
|
|
static av_always_inline uint32_t opus_rc_tell(const OpusRangeCoder *rc)
|
|
{
|
|
return rc->total_bits - av_log2(rc->range) - 1;
|
|
}
|
|
|
|
static av_always_inline uint32_t opus_rc_tell_frac(const OpusRangeCoder *rc)
|
|
{
|
|
uint32_t i, total_bits, rcbuffer, range;
|
|
|
|
total_bits = rc->total_bits << 3;
|
|
rcbuffer = av_log2(rc->range) + 1;
|
|
range = rc->range >> (rcbuffer-16);
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
int bit;
|
|
range = range * range >> 15;
|
|
bit = range >> 16;
|
|
rcbuffer = rcbuffer << 1 | bit;
|
|
range >>= bit;
|
|
}
|
|
|
|
return total_bits - rcbuffer;
|
|
}
|
|
|
|
uint32_t ff_opus_rc_dec_cdf(OpusRangeCoder *rc, const uint16_t *cdf);
|
|
void ff_opus_rc_enc_cdf(OpusRangeCoder *rc, int val, const uint16_t *cdf);
|
|
|
|
uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits);
|
|
void ff_opus_rc_enc_log(OpusRangeCoder *rc, int val, uint32_t bits);
|
|
|
|
uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0);
|
|
void ff_opus_rc_enc_uint_step(OpusRangeCoder *rc, uint32_t val, int k0);
|
|
|
|
uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn);
|
|
void ff_opus_rc_enc_uint_tri(OpusRangeCoder *rc, uint32_t k, int qn);
|
|
|
|
uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size);
|
|
void ff_opus_rc_enc_uint(OpusRangeCoder *rc, uint32_t val, uint32_t size);
|
|
|
|
uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count);
|
|
void ff_opus_rc_put_raw(OpusRangeCoder *rc, uint32_t val, uint32_t count);
|
|
|
|
int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, uint32_t symbol, int decay);
|
|
void ff_opus_rc_enc_laplace(OpusRangeCoder *rc, int *value, uint32_t symbol, int decay);
|
|
|
|
int ff_opus_rc_dec_init(OpusRangeCoder *rc, const uint8_t *data, int size);
|
|
void ff_opus_rc_dec_raw_init(OpusRangeCoder *rc, const uint8_t *rightend, uint32_t bytes);
|
|
|
|
void ff_opus_rc_enc_end(OpusRangeCoder *rc, uint8_t *dst, int size);
|
|
void ff_opus_rc_enc_init(OpusRangeCoder *rc);
|
|
|
|
#endif /* AVCODEC_OPUS_RC_H */
|