/*

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * audio volume filter
  */
 
 #ifndef AVFILTER_AF_VOLUME_H
 #define AVFILTER_AF_VOLUME_H
 
 #include "libavutil/common.h"

 #include "libavutil/eval.h"

 #include "libavutil/float_dsp.h"
 #include "libavutil/opt.h"
 #include "libavutil/samplefmt.h"
 
 enum PrecisionType {
     PRECISION_FIXED = 0,
     PRECISION_FLOAT,
     PRECISION_DOUBLE,
 };
 

 enum EvalMode {
     EVAL_MODE_ONCE,
     EVAL_MODE_FRAME,
     EVAL_MODE_NB
 };
 
 enum VolumeVarName {
     VAR_N,
     VAR_NB_CHANNELS,
     VAR_NB_CONSUMED_SAMPLES,
     VAR_NB_SAMPLES,
     VAR_POS,
     VAR_PTS,
     VAR_SAMPLE_RATE,
     VAR_STARTPTS,
     VAR_STARTT,
     VAR_T,
     VAR_TB,
     VAR_VOLUME,
     VAR_VARS_NB
 };
 

 enum ReplayGainType {
     REPLAYGAIN_DROP,
     REPLAYGAIN_IGNORE,
     REPLAYGAIN_TRACK,
     REPLAYGAIN_ALBUM,
 };
 

 typedef struct VolumeContext {
     const AVClass *class;

     AVFloatDSPContext *fdsp;

     int precision;
     int eval_mode;

     const char *volume_expr;
     AVExpr *volume_pexpr;
     double var_values[VAR_VARS_NB];
 

     int replaygain;

     double replaygain_preamp;

     int    replaygain_noclip;

     double volume;
     int    volume_i;
     int    channels;
     int    planes;
     enum AVSampleFormat sample_fmt;
 
     void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
                           int volume);
     int samples_align;
 } VolumeContext;
 

 void ff_volume_init_x86(VolumeContext *vol);
 

 #endif /* AVFILTER_AF_VOLUME_H */