libavfilter/af_volume.h

   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_VOLUME_H
  25 #define AVFILTER_VOLUME_H
  26
  27 #include <stdint.h>
  28 #include "libavutil/eval.h"
  29 #include "libavutil/float_dsp.h"
  30 #include "libavutil/log.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 #if FF_API_FRAME_PKT
  51     VAR_POS,
  52 #endif
  53     VAR_PTS,
  54     VAR_SAMPLE_RATE,
  55     VAR_STARTPTS,
  56     VAR_STARTT,
  57     VAR_T,
  58     VAR_TB,
  59     VAR_VOLUME,
  60     VAR_VARS_NB
  61 };
  62
  63 enum ReplayGainType {
  64     REPLAYGAIN_DROP,
  65     REPLAYGAIN_IGNORE,
  66     REPLAYGAIN_TRACK,
  67     REPLAYGAIN_ALBUM,
  68 };
  69
  70 typedef struct VolumeContext {
  71     const AVClass *class;
  72     AVFloatDSPContext *fdsp;
  73     int precision;
  74     int eval_mode;
  75     const char *volume_expr;
  76     AVExpr *volume_pexpr;
  77     double var_values[VAR_VARS_NB];
  78
  79     int replaygain;
  80     double replaygain_preamp;
  81     int    replaygain_noclip;
  82     double volume;
  83     int    volume_i;
  84     int    channels;
  85     int    planes;
  86     enum AVSampleFormat sample_fmt;
  87
  88     void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
  89                           int volume);
  90     int samples_align;
  91 } VolumeContext;
  92
  93 void ff_volume_init_x86(VolumeContext *vol);
  94
  95 #endif /* AVFILTER_VOLUME_H */