1/* 2 * Copyright (c) 2012 Andrew D'Addesio 3 * Copyright (c) 2013-2014 Mozilla Corporation 4 * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#ifndef AVCODEC_OPUS_RC_H 24#define AVCODEC_OPUS_RC_H 25 26#include <stdint.h> 27#include "get_bits.h" 28 29#define OPUS_MAX_PACKET_SIZE 1275 30 31#define opus_ilog(i) (av_log2(i) + !!(i)) 32 33typedef struct RawBitsContext { 34 const uint8_t *position; 35 uint32_t bytes; 36 uint32_t cachelen; 37 uint32_t cacheval; 38} RawBitsContext; 39 40typedef struct OpusRangeCoder { 41 GetBitContext gb; 42 RawBitsContext rb; 43 uint32_t range; 44 uint32_t value; 45 uint32_t total_bits; 46 47 /* Encoder */ 48 uint8_t buf[OPUS_MAX_PACKET_SIZE + 12]; /* memcpy vs (memmove + overreading) */ 49 uint8_t *rng_cur; /* Current range coded byte */ 50 int ext; /* Awaiting propagation */ 51 int rem; /* Carryout flag */ 52 53 /* Encoding stats */ 54 int waste; 55} OpusRangeCoder; 56 57/** 58 * CELT: estimate bits of entropy that have thus far been consumed for the 59 * current CELT frame, to integer and fractional (1/8th bit) precision 60 */ 61static av_always_inline uint32_t opus_rc_tell(const OpusRangeCoder *rc) 62{ 63 return rc->total_bits - av_log2(rc->range) - 1; 64} 65 66static av_always_inline uint32_t opus_rc_tell_frac(const OpusRangeCoder *rc) 67{ 68 uint32_t i, total_bits, rcbuffer, range; 69 70 total_bits = rc->total_bits << 3; 71 rcbuffer = av_log2(rc->range) + 1; 72 range = rc->range >> (rcbuffer-16); 73 74 for (i = 0; i < 3; i++) { 75 int bit; 76 range = range * range >> 15; 77 bit = range >> 16; 78 rcbuffer = rcbuffer << 1 | bit; 79 range >>= bit; 80 } 81 82 return total_bits - rcbuffer; 83} 84 85uint32_t ff_opus_rc_dec_cdf(OpusRangeCoder *rc, const uint16_t *cdf); 86void ff_opus_rc_enc_cdf(OpusRangeCoder *rc, int val, const uint16_t *cdf); 87 88uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits); 89void ff_opus_rc_enc_log(OpusRangeCoder *rc, int val, uint32_t bits); 90 91uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0); 92void ff_opus_rc_enc_uint_step(OpusRangeCoder *rc, uint32_t val, int k0); 93 94uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn); 95void ff_opus_rc_enc_uint_tri(OpusRangeCoder *rc, uint32_t k, int qn); 96 97uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size); 98void ff_opus_rc_enc_uint(OpusRangeCoder *rc, uint32_t val, uint32_t size); 99 100uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count); 101void ff_opus_rc_put_raw(OpusRangeCoder *rc, uint32_t val, uint32_t count); 102 103int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, uint32_t symbol, int decay); 104void ff_opus_rc_enc_laplace(OpusRangeCoder *rc, int *value, uint32_t symbol, int decay); 105 106int ff_opus_rc_dec_init(OpusRangeCoder *rc, const uint8_t *data, int size); 107void ff_opus_rc_dec_raw_init(OpusRangeCoder *rc, const uint8_t *rightend, uint32_t bytes); 108 109void ff_opus_rc_enc_end(OpusRangeCoder *rc, uint8_t *dst, int size); 110void ff_opus_rc_enc_init(OpusRangeCoder *rc); 111 112#define OPUS_RC_CHECKPOINT_UPDATE(rc) \ 113 rc_rollback_bits = opus_rc_tell_frac(rc); \ 114 rc_rollback_ctx = *rc 115 116#define OPUS_RC_CHECKPOINT_SPAWN(rc) \ 117 uint32_t rc_rollback_bits = opus_rc_tell_frac(rc); \ 118 OpusRangeCoder rc_rollback_ctx = *rc \ 119 120#define OPUS_RC_CHECKPOINT_BITS(rc) \ 121 (opus_rc_tell_frac(rc) - rc_rollback_bits) 122 123#define OPUS_RC_CHECKPOINT_ROLLBACK(rc) \ 124 memcpy(rc, &rc_rollback_ctx, sizeof(OpusRangeCoder)); \ 125 126#endif /* AVCODEC_OPUS_RC_H */ 127