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 #include "libavutil/mem_internal.h"
37 
38 #define CELT_VECTORS 11
39 #define CELT_ALLOC_STEPS 6
40 #define CELT_FINE_OFFSET 21
41 #define CELT_MAX_FINE_BITS 8
42 #define CELT_NORM_SCALE 16384
43 #define CELT_QTHETA_OFFSET 4
44 #define CELT_QTHETA_OFFSET_TWOPHASE 16
45 #define CELT_POSTFILTER_MINPERIOD 15
46 #define CELT_ENERGY_SILENCE (-28.0f)
47 
48 typedef struct CeltPVQ CeltPVQ;
49 
50 enum CeltSpread {
55 };
56 
62 
64 };
65 
66 typedef struct CeltBlock {
71 
73 
74  /* buffer for mdct output + postfilter */
75  DECLARE_ALIGNED(32, float, buf)[2048];
77 
78  /* Used by the encoder */
81 
82  /* postfilter parameters */
84  float pf_gains_new[3];
85  int pf_period;
86  float pf_gains[3];
88  float pf_gains_old[3];
89 
90  float emph_coeff;
91 } CeltBlock;
92 
93 struct CeltFrame {
94  // constant values that do not change during context lifetime
101  int channels;
104 
107  int end_band;
109  int transient;
110  int pfilter;
115  int blocks; /* number of iMDCT blocks in the frame, depends on transient */
116  int blocksize; /* size of each block */
117  int silence; /* Frame is filled with silence */
118  int anticollapse_needed; /* Whether to expect an anticollapse bit */
119  int anticollapse; /* Encoded anticollapse bit */
122  int flushed;
123  uint32_t seed;
125 
126  /* Encoder PF coeffs */
130  float pf_gain;
131 
132  /* Bit allocation */
141 };
142 
143 /* LCG for noise generation */
145 {
146  f->seed = 1664525 * f->seed + 1013904223;
147  return f->seed;
148 }
149 
150 static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
151 {
152  int i;
153  float g = 1e-15f;
154  for (i = 0; i < N; i++)
155  g += X[i] * X[i];
156  g = gain / sqrtf(g);
157 
158  for (i = 0; i < N; i++)
159  X[i] *= g;
160 }
161 
162 int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,
163  int apply_phase_inv);
164 
165 void ff_celt_free(CeltFrame **f);
166 
167 void ff_celt_flush(CeltFrame *f);
168 
170  int coded_channels, int frame_size, int startband, int endband);
171 
172 #endif /* AVCODEC_OPUS_CELT_H */
CeltFrame::dsp
AVFloatDSPContext * dsp
Definition: opus_celt.h:97
libm.h
CeltBlock::buf
float buf[2048]
Definition: opus_celt.h:75
mem_internal.h
CeltFrame::size
enum CeltBlockSize size
Definition: opus_celt.h:105
output
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
Definition: filter_design.txt:225
X
@ X
Definition: vf_addroi.c:26
CeltFrame::spread
enum CeltSpread spread
Definition: opus_celt.h:124
opusdsp.h
CeltFrame::start_band
int start_band
Definition: opus_celt.h:106
CELT_SPREAD_NONE
@ CELT_SPREAD_NONE
Definition: opus_celt.h:51
CeltFrame::avctx
AVCodecContext * avctx
Definition: opus_celt.h:95
opus.h
mdct15.h
CeltBlock::overlap
float overlap[FFALIGN(CELT_OVERLAP, 16)]
Definition: opus_celt.h:79
CeltBlock::lin_energy
float lin_energy[CELT_MAX_BANDS]
Definition: opus_celt.h:68
CELT_SPREAD_LIGHT
@ CELT_SPREAD_LIGHT
Definition: opus_celt.h:52
float.h
CeltFrame::framebits
int framebits
Definition: opus_celt.h:133
CELT_BLOCK_960
@ CELT_BLOCK_960
Definition: opus_celt.h:61
CELT_MAX_FRAME_SIZE
#define CELT_MAX_FRAME_SIZE
Definition: opus.h:45
CeltFrame::coded_bands
int coded_bands
Definition: opus_celt.h:108
CeltBlock::coeffs
float coeffs[CELT_MAX_FRAME_SIZE]
Definition: opus_celt.h:76
CeltBlock
Definition: opus_celt.h:66
CeltBlockSize
CeltBlockSize
Definition: opus_celt.h:57
ff_celt_flush
void ff_celt_flush(CeltFrame *f)
Definition: opus_celt.c:490
ff_celt_decode_frame
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
CeltFrame::blocksize
int blocksize
Definition: opus_celt.h:116
CeltPVQ
Definition: opus_pvq.h:37
CeltFrame::output_channels
int output_channels
Definition: opus_celt.h:102
CELT_BLOCK_480
@ CELT_BLOCK_480
Definition: opus_celt.h:60
CeltBlock::pf_gains_new
float pf_gains_new[3]
Definition: opus_celt.h:84
CeltFrame::anticollapse
int anticollapse
Definition: opus_celt.h:119
CELT_BLOCK_120
@ CELT_BLOCK_120
Definition: opus_celt.h:58
celt_renormalize_vector
static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
Definition: opus_celt.h:150
CeltFrame::apply_phase_inv
int apply_phase_inv
Definition: opus_celt.h:103
CeltBlock::samples
float samples[FFALIGN(CELT_MAX_FRAME_SIZE, 16)]
Definition: opus_celt.h:80
CELT_BLOCK_240
@ CELT_BLOCK_240
Definition: opus_celt.h:59
CeltFrame::remaining2
int remaining2
Definition: opus_celt.h:135
CeltFrame::pf_gain
float pf_gain
Definition: opus_celt.h:130
CeltBlock::energy
float energy[CELT_MAX_BANDS]
Definition: opus_celt.h:67
CeltFrame::skip_band_floor
int skip_band_floor
Definition: opus_celt.h:111
g
const char * g
Definition: vf_curves.c:117
frame_size
int frame_size
Definition: mxfenc.c:2206
CELT_SPREAD_NORMAL
@ CELT_SPREAD_NORMAL
Definition: opus_celt.h:53
CeltFrame::seed
uint32_t seed
Definition: opus_celt.h:123
CeltFrame::silence
int silence
Definition: opus_celt.h:117
CeltFrame::alloc_boost
int alloc_boost[CELT_MAX_BANDS]
Definition: opus_celt.h:114
CeltBlock::error_energy
float error_energy[CELT_MAX_BANDS]
Definition: opus_celt.h:69
MDCT15Context
Definition: mdct15.h:30
f
#define f(width, name)
Definition: cbs_vp9.c:255
CeltFrame::dual_stereo
int dual_stereo
Definition: opus_celt.h:121
CeltFrame::blocks
int blocks
Definition: opus_celt.h:115
CeltFrame::tf_change
int tf_change[CELT_MAX_BANDS]
Definition: opus_celt.h:140
CeltFrame::caps
int caps[CELT_MAX_BANDS]
Definition: opus_celt.h:136
CeltFrame::fine_bits
int fine_bits[CELT_MAX_BANDS]
Definition: opus_celt.h:137
CELT_MAX_BANDS
#define CELT_MAX_BANDS
Definition: opus.h:46
CeltBlock::prev_energy
float prev_energy[2][CELT_MAX_BANDS]
Definition: opus_celt.h:70
float_dsp.h
CeltBlock::pf_gains
float pf_gains[3]
Definition: opus_celt.h:86
CeltFrame::fine_priority
int fine_priority[CELT_MAX_BANDS]
Definition: opus_celt.h:138
opus_pvq.h
OpusRangeCoder
Definition: opus_rc.h:40
CeltBlock::pf_period
int pf_period
Definition: opus_celt.h:85
AVFloatDSPContext
Definition: float_dsp.h:24
celt_rng
static av_always_inline uint32_t celt_rng(CeltFrame *f)
Definition: opus_celt.h:144
N
#define N
Definition: af_mcompand.c:54
CeltFrame::channels
int channels
Definition: opus_celt.h:101
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
i
int i
Definition: input.c:407
CeltFrame::imdct
MDCT15Context * imdct[4]
Definition: opus_celt.h:96
CeltFrame::pulses
int pulses[CELT_MAX_BANDS]
Definition: opus_celt.h:139
CeltFrame::end_band
int end_band
Definition: opus_celt.h:107
CeltFrame::intensity_stereo
int intensity_stereo
Definition: opus_celt.h:120
av_always_inline
#define av_always_inline
Definition: attributes.h:49
CeltFrame::remaining
int remaining
Definition: opus_celt.h:134
CELT_SPREAD_AGGRESSIVE
@ CELT_SPREAD_AGGRESSIVE
Definition: opus_celt.h:54
CeltFrame::anticollapse_needed
int anticollapse_needed
Definition: opus_celt.h:118
AVCodecContext
main external API structure.
Definition: avcodec.h:384
CeltBlock::collapse_masks
uint8_t collapse_masks[CELT_MAX_BANDS]
Definition: opus_celt.h:72
CeltFrame::opusdsp
OpusDSP opusdsp
Definition: opus_celt.h:100
CeltFrame::pfilter
int pfilter
Definition: opus_celt.h:110
CeltSpread
CeltSpread
Definition: opus_celt.h:50
CeltFrame::pf_period
int pf_period
Definition: opus_celt.h:128
CeltBlock::pf_period_old
int pf_period_old
Definition: opus_celt.h:87
CeltBlock::emph_coeff
float emph_coeff
Definition: opus_celt.h:90
CeltFrame::flushed
int flushed
Definition: opus_celt.h:122
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
CELT_BLOCK_NB
@ CELT_BLOCK_NB
Definition: opus_celt.h:63
ff_celt_free
void ff_celt_free(CeltFrame **f)
Definition: opus_celt.c:521
CELT_OVERLAP
#define CELT_OVERLAP
Definition: opus.h:43
CeltBlock::pf_gains_old
float pf_gains_old[3]
Definition: opus_celt.h:88
CeltFrame::pf_octave
int pf_octave
Definition: opus_celt.h:127
CeltFrame::alloc_trim
int alloc_trim
Definition: opus_celt.h:113
CeltFrame::block
CeltBlock block[2]
Definition: opus_celt.h:98
CeltBlock::pf_period_new
int pf_period_new
Definition: opus_celt.h:83
ff_celt_init
int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels, int apply_phase_inv)
Definition: opus_celt.c:538
CeltFrame::tf_select
int tf_select
Definition: opus_celt.h:112
CeltFrame
Definition: opus_celt.h:93
CeltFrame::pvq
CeltPVQ * pvq
Definition: opus_celt.h:99
CeltFrame::pf_tapset
int pf_tapset
Definition: opus_celt.h:129
OpusDSP
Definition: opusdsp.h:26