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af_volume: add detach option 

Maybe this should be default. On the other hand, this filter does
something even if the volume is neutral: it clips samples against the
allowed range, should the decoder or a previous filter output garbage.
This commit is contained in:
wm4 2014-03-14 22:34:42 +01:00
parent b72ba3f744
commit dc0f2308d1
2 changed files with 10 additions and 0 deletions
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6
DOCS/man/en/af.rst
View File

@ -301,6 +301,12 @@ Available filters are:
``s16``
Force S16 sample format if set. Lower quality, but might be faster
in some situations.
``detach``
Remove the filter if the volume is not changed at audio filter config
time. Useful with replaygain: if the current file has no replaygain
tags, then the filter will be removed if this option is enabled.
(If ``--softvol=yes`` is used and the player volume controls are used
during playback, a different volume filter will be inserted.)
.. admonition:: Example

4
audio/filter/af_volume.c
View File

@ -39,6 +39,7 @@ struct priv {
int rgain_clip; // Enable/disable clipping prevention
int soft; // Enable/disable soft clipping
int fast; // Use fix-point volume control
int detach; // Detach if gain volume is neutral
float cfg_volume;
};
@ -136,6 +137,8 @@ static int control(struct af_instance *af, int cmd, void *arg)
s->rgain = MPMIN(s->rgain, 1.0 / peak);
}
}
if (s->detach && fabs(s->level + s->rgain - 1.0) < 0.00001)
return AF_DETACH;
return af_test_output(af, in);
}
case AF_CONTROL_SET_VOLUME:
@ -209,6 +212,7 @@ struct af_info af_info_volume = {
OPT_FLAG("replaygain-clip", rgain_clip, 0),
OPT_FLAG("softclip", soft, 0),
OPT_FLAG("s16", fast, 0),
OPT_FLAG("detach", detach, 0),
{0}
},
};