mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.7 KiB
85 lines
2.7 KiB
/* |
|
* Copyright (c) 2012 Andrew D'Addesio |
|
* Copyright (c) 2013-2014 Mozilla Corporation |
|
* Copyright (c) 2016 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_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_read_bits; |
|
} 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_read_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_read_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); |
|
uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits); |
|
uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size); |
|
uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0); |
|
uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn); |
|
uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count); |
|
int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, 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); |
|
|
|
#endif /* AVCODEC_OPUS_RC_H */
|
|
|