LCOV - code coverage report
Current view: top level - libavcodec - opus_celt.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 11 100.0 %
Date: 2017-12-13 10:57:33 Functions: 2 2 100.0 %

          Line data    Source code
       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             : 
      32             : #include "mdct15.h"
      33             : #include "libavutil/float_dsp.h"
      34             : #include "libavutil/libm.h"
      35             : 
      36             : #define CELT_VECTORS                 11
      37             : #define CELT_ALLOC_STEPS             6
      38             : #define CELT_FINE_OFFSET             21
      39             : #define CELT_MAX_FINE_BITS           8
      40             : #define CELT_NORM_SCALE              16384
      41             : #define CELT_QTHETA_OFFSET           4
      42             : #define CELT_QTHETA_OFFSET_TWOPHASE  16
      43             : #define CELT_EMPH_COEFF              0.85000610f
      44             : #define CELT_POSTFILTER_MINPERIOD    15
      45             : #define CELT_ENERGY_SILENCE          (-28.0f)
      46             : 
      47             : typedef struct CeltPVQ CeltPVQ;
      48             : 
      49             : enum CeltSpread {
      50             :     CELT_SPREAD_NONE,
      51             :     CELT_SPREAD_LIGHT,
      52             :     CELT_SPREAD_NORMAL,
      53             :     CELT_SPREAD_AGGRESSIVE
      54             : };
      55             : 
      56             : enum CeltBlockSize {
      57             :     CELT_BLOCK_120,
      58             :     CELT_BLOCK_240,
      59             :     CELT_BLOCK_480,
      60             :     CELT_BLOCK_960,
      61             : 
      62             :     CELT_BLOCK_NB
      63             : };
      64             : 
      65             : typedef struct CeltBlock {
      66             :     float energy[CELT_MAX_BANDS];
      67             :     float lin_energy[CELT_MAX_BANDS];
      68             :     float error_energy[CELT_MAX_BANDS];
      69             :     float prev_energy[2][CELT_MAX_BANDS];
      70             : 
      71             :     uint8_t collapse_masks[CELT_MAX_BANDS];
      72             : 
      73             :     /* buffer for mdct output + postfilter */
      74             :     DECLARE_ALIGNED(32, float, buf)[2048];
      75             :     DECLARE_ALIGNED(32, float, coeffs)[CELT_MAX_FRAME_SIZE];
      76             : 
      77             :     /* Used by the encoder */
      78             :     DECLARE_ALIGNED(32, float, overlap)[FFALIGN(CELT_OVERLAP, 16)];
      79             :     DECLARE_ALIGNED(32, float, samples)[FFALIGN(CELT_MAX_FRAME_SIZE, 16)];
      80             : 
      81             :     /* postfilter parameters */
      82             :     int   pf_period_new;
      83             :     float pf_gains_new[3];
      84             :     int   pf_period;
      85             :     float pf_gains[3];
      86             :     int   pf_period_old;
      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
      94             :     AVCodecContext      *avctx;
      95             :     MDCT15Context       *imdct[4];
      96             :     AVFloatDSPContext   *dsp;
      97             :     CeltBlock           block[2];
      98             :     CeltPVQ             *pvq;
      99             :     int channels;
     100             :     int output_channels;
     101             :     int apply_phase_inv;
     102             : 
     103             :     enum CeltBlockSize size;
     104             :     int start_band;
     105             :     int end_band;
     106             :     int coded_bands;
     107             :     int transient;
     108             :     int pfilter;
     109             :     int skip_band_floor;
     110             :     int tf_select;
     111             :     int alloc_trim;
     112             :     int alloc_boost[CELT_MAX_BANDS];
     113             :     int blocks;        /* number of iMDCT blocks in the frame, depends on transient */
     114             :     int blocksize;     /* size of each block */
     115             :     int silence;       /* Frame is filled with silence */
     116             :     int anticollapse_needed; /* Whether to expect an anticollapse bit */
     117             :     int anticollapse;  /* Encoded anticollapse bit */
     118             :     int intensity_stereo;
     119             :     int dual_stereo;
     120             :     int flushed;
     121             :     uint32_t seed;
     122             :     enum CeltSpread spread;
     123             : 
     124             :     /* Encoder PF coeffs */
     125             :     int pf_octave;
     126             :     int pf_period;
     127             :     int pf_tapset;
     128             :     float pf_gain;
     129             : 
     130             :     /* Bit allocation */
     131             :     int framebits;
     132             :     int remaining;
     133             :     int remaining2;
     134             :     int caps         [CELT_MAX_BANDS];
     135             :     int fine_bits    [CELT_MAX_BANDS];
     136             :     int fine_priority[CELT_MAX_BANDS];
     137             :     int pulses       [CELT_MAX_BANDS];
     138             :     int tf_change    [CELT_MAX_BANDS];
     139             : };
     140             : 
     141             : /* LCG for noise generation */
     142     2076432 : static av_always_inline uint32_t celt_rng(CeltFrame *f)
     143             : {
     144     2076432 :     f->seed = 1664525 * f->seed + 1013904223;
     145     2076432 :     return f->seed;
     146             : }
     147             : 
     148       62573 : static av_always_inline void celt_renormalize_vector(float *X, int N, float gain)
     149             : {
     150             :     int i;
     151       62573 :     float g = 1e-15f;
     152     2311153 :     for (i = 0; i < N; i++)
     153     2248580 :         g += X[i] * X[i];
     154       62573 :     g = gain / sqrtf(g);
     155             : 
     156     2311153 :     for (i = 0; i < N; i++)
     157     2248580 :         X[i] *= g;
     158       62573 : }
     159             : 
     160             : int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,
     161             :                  int apply_phase_inv);
     162             : 
     163             : void ff_celt_free(CeltFrame **f);
     164             : 
     165             : void ff_celt_flush(CeltFrame *f);
     166             : 
     167             : int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, float **output,
     168             :                          int coded_channels, int frame_size, int startband, int endband);
     169             : 
     170             : #endif /* AVCODEC_OPUS_CELT_H */

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