/* * 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 "libavcodec/get_bits.h" #include "opus.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_bits;     /* Encoder */    uint8_t buf[OPUS_MAX_FRAME_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); #define OPUS_RC_CHECKPOINT_UPDATE(rc) \    rc_rollback_bits = opus_rc_tell_frac(rc); \    rc_rollback_ctx  = *rc #define OPUS_RC_CHECKPOINT_SPAWN(rc) \    uint32_t rc_rollback_bits = opus_rc_tell_frac(rc); \    OpusRangeCoder rc_rollback_ctx = *rc \ #define OPUS_RC_CHECKPOINT_BITS(rc) \    (opus_rc_tell_frac(rc) - rc_rollback_bits) #define OPUS_RC_CHECKPOINT_ROLLBACK(rc) \    memcpy(rc, &rc_rollback_ctx, sizeof(OpusRangeCoder)); \ #endif /* AVCODEC_OPUS_RC_H */