FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/opus_celt.h
Date: 2022-11-28 23:49:43
Exec Total Coverage
Lines: 11 11 100.0%
Branches: 4 4 100.0%

Line Branch Exec Source
1 /*
2 * Opus decoder/encoder CELT functions
3 * Copyright (c) 2012 Andrew D'Addesio
4 * Copyright (c) 2013-2014 Mozilla Corporation
5 * Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #ifndef AVCODEC_OPUS_CELT_H
25 #define AVCODEC_OPUS_CELT_H
26
27 #include <stdint.h>
28
29 #include "avcodec.h"
30 #include "opusdsp.h"
31 #include "opus_rc.h"
32
33 #include "libavutil/float_dsp.h"
34 #include "libavutil/libm.h"
35 #include "libavutil/mem_internal.h"
36 #include "libavutil/tx.h"
37
38 #define CELT_SHORT_BLOCKSIZE 120
39 #define CELT_OVERLAP CELT_SHORT_BLOCKSIZE
40 #define CELT_MAX_LOG_BLOCKS 3
41 #define CELT_MAX_FRAME_SIZE (CELT_SHORT_BLOCKSIZE * (1 << CELT_MAX_LOG_BLOCKS))
42 #define CELT_MAX_BANDS 21
43
44 #define CELT_VECTORS 11
45 #define CELT_ALLOC_STEPS 6
46 #define CELT_FINE_OFFSET 21
47 #define CELT_MAX_FINE_BITS 8
48 #define CELT_NORM_SCALE 16384
49 #define CELT_QTHETA_OFFSET 4
50 #define CELT_QTHETA_OFFSET_TWOPHASE 16
51 #define CELT_POSTFILTER_MINPERIOD 15
52 #define CELT_ENERGY_SILENCE (-28.0f)
53
54 enum CeltSpread {
55 CELT_SPREAD_NONE,
56 CELT_SPREAD_LIGHT,
57 CELT_SPREAD_NORMAL,
58 CELT_SPREAD_AGGRESSIVE
59 };
60
61 enum CeltBlockSize {
62 CELT_BLOCK_120,
63 CELT_BLOCK_240,
64 CELT_BLOCK_480,
65 CELT_BLOCK_960,
66
67 CELT_BLOCK_NB
68 };
69
70 typedef struct CeltBlock {
71 float energy[CELT_MAX_BANDS];
72 float lin_energy[CELT_MAX_BANDS];
73 float error_energy[CELT_MAX_BANDS];
74 float prev_energy[2][CELT_MAX_BANDS];
75
76 uint8_t collapse_masks[CELT_MAX_BANDS];
77
78 /* buffer for mdct output + postfilter */
79 DECLARE_ALIGNED(32, float, buf)[2048];
80 DECLARE_ALIGNED(32, float, coeffs)[CELT_MAX_FRAME_SIZE];
81
82 /* Used by the encoder */
83 DECLARE_ALIGNED(32, float, overlap)[FFALIGN(CELT_OVERLAP, 16)];
84 DECLARE_ALIGNED(32, float, samples)[FFALIGN(CELT_MAX_FRAME_SIZE, 16)];
85
86 /* postfilter parameters */
87 int pf_period_new;
88 float pf_gains_new[3];
89 int pf_period;
90 float pf_gains[3];
91 int pf_period_old;
92 float pf_gains_old[3];
93
94 float emph_coeff;
95 } CeltBlock;
96
97 typedef struct CeltFrame {
98 // constant values that do not change during context lifetime
99 AVCodecContext *avctx;
100 AVTXContext *tx[4];
101 av_tx_fn tx_fn[4];
102 AVFloatDSPContext *dsp;
103 CeltBlock block[2];
104 struct CeltPVQ *pvq;
105 OpusDSP opusdsp;
106 int channels;
107 int output_channels;
108 int apply_phase_inv;
109
110 enum CeltBlockSize size;
111 int start_band;
112 int end_band;
113 int coded_bands;
114 int transient;
115 int pfilter;
116 int skip_band_floor;
117 int tf_select;
118 int alloc_trim;
119 int alloc_boost[CELT_MAX_BANDS];
120 int blocks; /* number of iMDCT blocks in the frame, depends on transient */
121 int blocksize; /* size of each block */
122 int silence; /* Frame is filled with silence */
123 int anticollapse_needed; /* Whether to expect an anticollapse bit */
124 int anticollapse; /* Encoded anticollapse bit */
125 int intensity_stereo;
126 int dual_stereo;
127 int flushed;
128 uint32_t seed;
129 enum CeltSpread spread;
130
131 /* Encoder PF coeffs */
132 int pf_octave;
133 int pf_period;
134 int pf_tapset;
135 float pf_gain;
136
137 /* Bit allocation */
138 int framebits;
139 int remaining;
140 int remaining2;
141 int caps [CELT_MAX_BANDS];
142 int fine_bits [CELT_MAX_BANDS];
143 int fine_priority[CELT_MAX_BANDS];
144 int pulses [CELT_MAX_BANDS];
145 int tf_change [CELT_MAX_BANDS];
146 } CeltFrame;
147
148 /* LCG for noise generation */
149 2084987 static av_always_inline uint32_t celt_rng(CeltFrame *f)
150 {
151 2084987 f->seed = 1664525 * f->seed + 1013904223;
152 2084987 return f->seed;
153 }
154
155 63014 static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
156 {
157 int i;
158 63014 float g = 1e-15f;
159
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2331716 for (i = 0; i < N; i++)
160 2268702 g += X[i] * X[i];
161 63014 g = gain / sqrtf(g);
162
163
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2331716 for (i = 0; i < N; i++)
164 2268702 X[i] *= g;
165 63014 }
166
167 int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,
168 int apply_phase_inv);
169
170 void ff_celt_free(CeltFrame **f);
171
172 void ff_celt_flush(CeltFrame *f);
173
174 int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, float **output,
175 int coded_channels, int frame_size, int startband, int endband);
176
177 /* Encode or decode CELT bands */
178 void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc);
179
180 /* Encode or decode CELT bitallocation */
181 void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode);
182
183 #endif /* AVCODEC_OPUS_CELT_H */
184