FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/opus_rc.h
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 12 12 100.0%
Functions: 2 2 100.0%
Branches: 2 2 100.0%
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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 #include "opus.h"
29
30 #define opus_ilog(i) (av_log2(i) + !!(i))
31
32 typedef struct RawBitsContext {
33 const uint8_t *position;
34 uint32_t bytes;
35 uint32_t cachelen;
36 uint32_t cacheval;
37 } RawBitsContext;
38
39 typedef struct OpusRangeCoder {
40 GetBitContext gb;
41 RawBitsContext rb;
42 uint32_t range;
43 uint32_t value;
44 uint32_t total_bits;
45
46 /* Encoder */
47 uint8_t buf[OPUS_MAX_FRAME_SIZE + 12]; /* memcpy vs (memmove + overreading) */
48 uint8_t *rng_cur; /* Current range coded byte */
49 int ext; /* Awaiting propagation */
50 int rem; /* Carryout flag */
51
52 /* Encoding stats */
53 int waste;
54 } OpusRangeCoder;
55
56 /**
57 * CELT: estimate bits of entropy that have thus far been consumed for the
58 * current CELT frame, to integer and fractional (1/8th bit) precision
59 */
60 1581868 static av_always_inline uint32_t opus_rc_tell(const OpusRangeCoder *rc)
61 {
62 1581868 return rc->total_bits - av_log2(rc->range) - 1;
63 }
64
65 2349088 static av_always_inline uint32_t opus_rc_tell_frac(const OpusRangeCoder *rc)
66 {
67 uint32_t i, total_bits, rcbuffer, range;
68
69 2349088 total_bits = rc->total_bits << 3;
70 2349088 rcbuffer = av_log2(rc->range) + 1;
71 2349088 range = rc->range >> (rcbuffer-16);
72
73
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 9396352 for (i = 0; i < 3; i++) {
74 int bit;
75 7047264 range = range * range >> 15;
76 7047264 bit = range >> 16;
77 7047264 rcbuffer = rcbuffer << 1 | bit;
78 7047264 range >>= bit;
79 }
80
81 2349088 return total_bits - rcbuffer;
82 }
83
84 uint32_t ff_opus_rc_dec_cdf(OpusRangeCoder *rc, const uint16_t *cdf);
85 void ff_opus_rc_enc_cdf(OpusRangeCoder *rc, int val, const uint16_t *cdf);
86
87 uint32_t ff_opus_rc_dec_log(OpusRangeCoder *rc, uint32_t bits);
88 void ff_opus_rc_enc_log(OpusRangeCoder *rc, int val, uint32_t bits);
89
90 uint32_t ff_opus_rc_dec_uint_step(OpusRangeCoder *rc, int k0);
91 void ff_opus_rc_enc_uint_step(OpusRangeCoder *rc, uint32_t val, int k0);
92
93 uint32_t ff_opus_rc_dec_uint_tri(OpusRangeCoder *rc, int qn);
94 void ff_opus_rc_enc_uint_tri(OpusRangeCoder *rc, uint32_t k, int qn);
95
96 uint32_t ff_opus_rc_dec_uint(OpusRangeCoder *rc, uint32_t size);
97 void ff_opus_rc_enc_uint(OpusRangeCoder *rc, uint32_t val, uint32_t size);
98
99 uint32_t ff_opus_rc_get_raw(OpusRangeCoder *rc, uint32_t count);
100 void ff_opus_rc_put_raw(OpusRangeCoder *rc, uint32_t val, uint32_t count);
101
102 int ff_opus_rc_dec_laplace(OpusRangeCoder *rc, uint32_t symbol, int decay);
103 void ff_opus_rc_enc_laplace(OpusRangeCoder *rc, int *value, uint32_t symbol, int decay);
104
105 int ff_opus_rc_dec_init(OpusRangeCoder *rc, const uint8_t *data, int size);
106 void ff_opus_rc_dec_raw_init(OpusRangeCoder *rc, const uint8_t *rightend, uint32_t bytes);
107
108 void ff_opus_rc_enc_end(OpusRangeCoder *rc, uint8_t *dst, int size);
109 void ff_opus_rc_enc_init(OpusRangeCoder *rc);
110
111 #define OPUS_RC_CHECKPOINT_UPDATE(rc) \
112 rc_rollback_bits = opus_rc_tell_frac(rc); \
113 rc_rollback_ctx = *rc
114
115 #define OPUS_RC_CHECKPOINT_SPAWN(rc) \
116 uint32_t rc_rollback_bits = opus_rc_tell_frac(rc); \
117 OpusRangeCoder rc_rollback_ctx = *rc \
118
119 #define OPUS_RC_CHECKPOINT_BITS(rc) \
120 (opus_rc_tell_frac(rc) - rc_rollback_bits)
121
122 #define OPUS_RC_CHECKPOINT_ROLLBACK(rc) \
123 memcpy(rc, &rc_rollback_ctx, sizeof(OpusRangeCoder)); \
124
125 #endif /* AVCODEC_OPUS_RC_H */
126