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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. /**
  20.  * @file
  21.  * audio volume filter
  22.  */
  23.  
  24. #ifndef AVFILTER_AF_VOLUME_H
  25. #define AVFILTER_AF_VOLUME_H
  26.  
  27. #include "libavutil/common.h"
  28. #include "libavutil/eval.h"
  29. #include "libavutil/float_dsp.h"
  30. #include "libavutil/opt.h"
  31. #include "libavutil/samplefmt.h"
  32.  
  33. enum PrecisionType {
  34.     PRECISION_FIXED = 0,
  35.     PRECISION_FLOAT,
  36.     PRECISION_DOUBLE,
  37. };
  38.  
  39. enum EvalMode {
  40.     EVAL_MODE_ONCE,
  41.     EVAL_MODE_FRAME,
  42.     EVAL_MODE_NB
  43. };
  44.  
  45. enum VolumeVarName {
  46.     VAR_N,
  47.     VAR_NB_CHANNELS,
  48.     VAR_NB_CONSUMED_SAMPLES,
  49.     VAR_NB_SAMPLES,
  50.     VAR_POS,
  51.     VAR_PTS,
  52.     VAR_SAMPLE_RATE,
  53.     VAR_STARTPTS,
  54.     VAR_STARTT,
  55.     VAR_T,
  56.     VAR_TB,
  57.     VAR_VOLUME,
  58.     VAR_VARS_NB
  59. };
  60.  
  61. enum ReplayGainType {
  62.     REPLAYGAIN_DROP,
  63.     REPLAYGAIN_IGNORE,
  64.     REPLAYGAIN_TRACK,
  65.     REPLAYGAIN_ALBUM,
  66. };
  67.  
  68. typedef struct VolumeContext {
  69.     const AVClass *class;
  70.     AVFloatDSPContext *fdsp;
  71.     int precision;
  72.     int eval_mode;
  73.     const char *volume_expr;
  74.     AVExpr *volume_pexpr;
  75.     double var_values[VAR_VARS_NB];
  76.  
  77.     int replaygain;
  78.     double replaygain_preamp;
  79.     int    replaygain_noclip;
  80.     double volume;
  81.     int    volume_i;
  82.     int    channels;
  83.     int    planes;
  84.     enum AVSampleFormat sample_fmt;
  85.  
  86.     void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
  87.                           int volume);
  88.     int samples_align;
  89. } VolumeContext;
  90.  
  91. void ff_volume_init_x86(VolumeContext *vol);
  92.  
  93. #endif /* AVFILTER_AF_VOLUME_H */
  94.