FFmpeg
opus_celt.h
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1 /*
2  * Opus decoder/demuxer common 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 <float.h>
28 
29 #include "opus.h"
30 #include "opus_pvq.h"
31 #include "opusdsp.h"
32 
33 #include "mdct15.h"
34 #include "libavutil/float_dsp.h"
35 #include "libavutil/libm.h"
36 
37 #define CELT_VECTORS 11
38 #define CELT_ALLOC_STEPS 6
39 #define CELT_FINE_OFFSET 21
40 #define CELT_MAX_FINE_BITS 8
41 #define CELT_NORM_SCALE 16384
42 #define CELT_QTHETA_OFFSET 4
43 #define CELT_QTHETA_OFFSET_TWOPHASE 16
44 #define CELT_POSTFILTER_MINPERIOD 15
45 #define CELT_ENERGY_SILENCE (-28.0f)
46 
47 typedef struct CeltPVQ CeltPVQ;
48 
49 enum CeltSpread {
54 };
55 
61 
63 };
64 
65 typedef struct CeltBlock {
70 
72 
73  /* buffer for mdct output + postfilter */
74  DECLARE_ALIGNED(32, float, buf)[2048];
76 
77  /* Used by the encoder */
80 
81  /* postfilter parameters */
83  float pf_gains_new[3];
84  int pf_period;
85  float pf_gains[3];
87  float pf_gains_old[3];
88 
89  float emph_coeff;
90 } CeltBlock;
91 
92 struct CeltFrame {
93  // constant values that do not change during context lifetime
95  MDCT15Context *imdct[4];
100  int channels;
103 
106  int end_band;
108  int transient;
109  int pfilter;
113  int alloc_boost[CELT_MAX_BANDS];
114  int blocks; /* number of iMDCT blocks in the frame, depends on transient */
115  int blocksize; /* size of each block */
116  int silence; /* Frame is filled with silence */
117  int anticollapse_needed; /* Whether to expect an anticollapse bit */
118  int anticollapse; /* Encoded anticollapse bit */
121  int flushed;
122  uint32_t seed;
123  enum CeltSpread spread;
124 
125  /* Encoder PF coeffs */
129  float pf_gain;
130 
131  /* Bit allocation */
135  int caps [CELT_MAX_BANDS];
136  int fine_bits [CELT_MAX_BANDS];
137  int fine_priority[CELT_MAX_BANDS];
139  int tf_change [CELT_MAX_BANDS];
140 };
141 
142 /* LCG for noise generation */
144 {
145  f->seed = 1664525 * f->seed + 1013904223;
146  return f->seed;
147 }
148 
149 static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
150 {
151  int i;
152  float g = 1e-15f;
153  for (i = 0; i < N; i++)
154  g += X[i] * X[i];
155  g = gain / sqrtf(g);
156 
157  for (i = 0; i < N; i++)
158  X[i] *= g;
159 }
160 
161 int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,
162  int apply_phase_inv);
163 
164 void ff_celt_free(CeltFrame **f);
165 
166 void ff_celt_flush(CeltFrame *f);
167 
169  int coded_channels, int frame_size, int startband, int endband);
170 
171 #endif /* AVCODEC_OPUS_CELT_H */
int channels
Definition: opus_celt.h:100
int anticollapse
Definition: opus_celt.h:118
int framebits
Definition: opus_celt.h:132
int remaining2
Definition: opus_celt.h:134
float coeffs[CELT_MAX_FRAME_SIZE]
Definition: opus_celt.h:75
const char * g
Definition: vf_curves.c:115
int output_channels
Definition: opus_celt.h:101
static const int8_t pulses[4]
Number of non-zero pulses in the MP-MLQ excitation.
Definition: g723_1.h:723
float pf_gains_new[3]
Definition: opus_celt.h:83
Definition: vf_addroi.c:26
int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, float **output, int coded_channels, int frame_size, int startband, int endband)
Definition: opus_celt.c:320
int pf_period
Definition: opus_celt.h:127
#define N
Definition: af_mcompand.c:54
int pf_period_new
Definition: opus_celt.h:82
int flushed
Definition: opus_celt.h:121
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
#define CELT_OVERLAP
Definition: opus.h:42
int silence
Definition: opus_celt.h:116
#define f(width, name)
Definition: cbs_vp9.c:255
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
int dual_stereo
Definition: opus_celt.h:120
ptrdiff_t size
Definition: opengl_enc.c:100
int coded_bands
Definition: opus_celt.h:107
float lin_energy[CELT_MAX_BANDS]
Definition: opus_celt.h:67
int skip_band_floor
Definition: opus_celt.h:110
#define FFALIGN(x, a)
Definition: macros.h:48
int end_band
Definition: opus_celt.h:106
float samples[FFALIGN(CELT_MAX_FRAME_SIZE, 16)]
Definition: opus_celt.h:79
float pf_gains[3]
Definition: opus_celt.h:85
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
int start_band
Definition: opus_celt.h:105
float emph_coeff
Definition: opus_celt.h:89
int pfilter
Definition: opus_celt.h:109
int apply_phase_inv
Definition: opus_celt.h:102
int anticollapse_needed
Definition: opus_celt.h:117
float pf_gain
Definition: opus_celt.h:129
AVCodecContext * avctx
Definition: opus_celt.h:94
uint32_t seed
Definition: opus_celt.h:122
void ff_celt_flush(CeltFrame *f)
Definition: opus_celt.c:490
int blocks
Definition: opus_celt.h:114
CeltBlockSize
Definition: opus_celt.h:56
float error_energy[CELT_MAX_BANDS]
Definition: opus_celt.h:68
int frame_size
Definition: mxfenc.c:2150
#define CELT_MAX_BANDS
Definition: opus.h:45
int pf_tapset
Definition: opus_celt.h:128
main external API structure.
Definition: avcodec.h:1570
int pf_period_old
Definition: opus_celt.h:86
int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels, int apply_phase_inv)
Definition: opus_celt.c:538
AVFloatDSPContext * dsp
Definition: opus_celt.h:96
Replacements for frequently missing libm functions.
OpusDSP opusdsp
Definition: opus_celt.h:99
CeltPVQ * pvq
Definition: opus_celt.h:98
CeltSpread
Definition: opus_celt.h:49
static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
Definition: opus_celt.h:149
float pf_gains_old[3]
Definition: opus_celt.h:87
int remaining
Definition: opus_celt.h:133
float energy[CELT_MAX_BANDS]
Definition: opus_celt.h:66
static av_always_inline uint32_t celt_rng(CeltFrame *f)
Definition: opus_celt.h:143
void ff_celt_free(CeltFrame **f)
Definition: opus_celt.c:521
int tf_select
Definition: opus_celt.h:111
int blocksize
Definition: opus_celt.h:115
#define CELT_MAX_FRAME_SIZE
Definition: opus.h:44
#define av_always_inline
Definition: attributes.h:39
int alloc_trim
Definition: opus_celt.h:112
int pf_period
Definition: opus_celt.h:84
float prev_energy[2][CELT_MAX_BANDS]
Definition: opus_celt.h:69
uint8_t collapse_masks[CELT_MAX_BANDS]
Definition: opus_celt.h:71
int pf_octave
Definition: opus_celt.h:126
float overlap[FFALIGN(CELT_OVERLAP, 16)]
Definition: opus_celt.h:78
int intensity_stereo
Definition: opus_celt.h:119
float buf[2048]
Definition: opus_celt.h:74