@@ -633,6 +633,12 @@ Prefer track gain, if present.

 @item album

 Prefer album gain, if present.

 @end table

+

+@item replaygain_preamp

+Pre-amplification gain in dB to apply to the selected replaygain gain.

+

+Default value for @var{replaygain_preamp} is 0.0.

+

 @end table

 @subsection Examples

@@ -59,6 +59,8 @@ static const AVOption options[] = {

         { "ignore", "replaygain side data is ignored", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_IGNORE }, 0, 0, A, "replaygain" },

         { "track",  "track gain is preferred",         0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK  }, 0, 0, A, "replaygain" },

         { "album",  "album gain is preferred",         0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_ALBUM  }, 0, 0, A, "replaygain" },

+    { "replaygain_preamp", "Apply replaygain pre-amplification",

+            OFFSET(replaygain_preamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, -15.0, 15.0, A },

     { NULL },

 };

@@ -262,7 +264,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)

             av_log(inlink->dst, AV_LOG_VERBOSE,

                    "Using gain %f dB from replaygain side data.\n", g);

-            vol->volume   = pow(10, g / 20);

+            vol->volume   = pow(10, (g + vol->replaygain_preamp) / 20);

             vol->volume_i = (int)(vol->volume * 256 + 0.5);

             volume_init(vol);

@@ -47,6 +47,7 @@ typedef struct VolumeContext {

     AVFloatDSPContext fdsp;

     enum PrecisionType precision;

     enum ReplayGainType replaygain;

+    double replaygain_preamp;

     double volume;

     int    volume_i;

     int    channels;