libavfilter/af_volume.h

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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  * Libav 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 Libav; 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 */