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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/float_dsp.h"
  29. #include "libavutil/opt.h"
  30. #include "libavutil/samplefmt.h"
  31.  
  32. enum PrecisionType {
  33.     PRECISION_FIXED = 0,
  34.     PRECISION_FLOAT,
  35.     PRECISION_DOUBLE,
  36. };
  37.  
  38. typedef struct VolumeContext {
  39.     const AVClass *class;
  40.     AVFloatDSPContext fdsp;
  41.     enum PrecisionType precision;
  42.     double volume;
  43.     int    volume_i;
  44.     int    channels;
  45.     int    planes;
  46.     enum AVSampleFormat sample_fmt;
  47.  
  48.     void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
  49.                           int volume);
  50.     int samples_align;
  51. } VolumeContext;
  52.  
  53. void ff_volume_init_x86(VolumeContext *vol);
  54.  
  55. #endif /* AVFILTER_AF_VOLUME_H */
  56.