LCOV - code coverage report
Current view: top level - libavcodec - opus_rc.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 12 12 100.0 %
Date: 2017-12-15 18:13:28 Functions: 2 2 100.0 %

          Line data    Source code
       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             : 
      33             : typedef struct RawBitsContext {
      34             :     const uint8_t *position;
      35             :     uint32_t bytes;
      36             :     uint32_t cachelen;
      37             :     uint32_t cacheval;
      38             : } RawBitsContext;
      39             : 
      40             : typedef 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             :  */
      61     1579767 : static av_always_inline uint32_t opus_rc_tell(const OpusRangeCoder *rc)
      62             : {
      63     1579767 :     return rc->total_bits - av_log2(rc->range) - 1;
      64             : }
      65             : 
      66     2341815 : static av_always_inline uint32_t opus_rc_tell_frac(const OpusRangeCoder *rc)
      67             : {
      68             :     uint32_t i, total_bits, rcbuffer, range;
      69             : 
      70     2341815 :     total_bits = rc->total_bits << 3;
      71     2341815 :     rcbuffer   = av_log2(rc->range) + 1;
      72     2341815 :     range      = rc->range >> (rcbuffer-16);
      73             : 
      74     9367260 :     for (i = 0; i < 3; i++) {
      75             :         int bit;
      76     7025445 :         range = range * range >> 15;
      77     7025445 :         bit = range >> 16;
      78     7025445 :         rcbuffer = rcbuffer << 1 | bit;
      79     7025445 :         range >>= bit;
      80             :     }
      81             : 
      82     2341815 :     return total_bits - rcbuffer;
      83             : }
      84             : 
      85             : uint32_t ff_opus_rc_dec_cdf(OpusRangeCoder *rc, const uint16_t *cdf);
      86             : void     ff_opus_rc_enc_cdf(OpusRangeCoder *rc, int val, const uint16_t *cdf);
      87             : 
      88             : uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits);
      89             : void     ff_opus_rc_enc_log(OpusRangeCoder *rc, int val, uint32_t bits);
      90             : 
      91             : uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0);
      92             : void     ff_opus_rc_enc_uint_step(OpusRangeCoder *rc, uint32_t val, int k0);
      93             : 
      94             : uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn);
      95             : void     ff_opus_rc_enc_uint_tri(OpusRangeCoder *rc, uint32_t k, int qn);
      96             : 
      97             : uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size);
      98             : void     ff_opus_rc_enc_uint(OpusRangeCoder *rc, uint32_t val, uint32_t size);
      99             : 
     100             : uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count);
     101             : void     ff_opus_rc_put_raw(OpusRangeCoder *rc, uint32_t val, uint32_t count);
     102             : 
     103             : int      ff_opus_rc_dec_laplace(OpusRangeCoder *rc, uint32_t symbol, int decay);
     104             : void     ff_opus_rc_enc_laplace(OpusRangeCoder *rc, int *value, uint32_t symbol, int decay);
     105             : 
     106             : int      ff_opus_rc_dec_init(OpusRangeCoder *rc, const uint8_t *data, int size);
     107             : void     ff_opus_rc_dec_raw_init(OpusRangeCoder *rc, const uint8_t *rightend, uint32_t bytes);
     108             : 
     109             : void     ff_opus_rc_enc_end(OpusRangeCoder *rc, uint8_t *dst, int size);
     110             : void     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 */

Generated by: LCOV version 1.13