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replay_gain: optionally use hardware mixer to apply replay gain

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Add an option for each audio output which enables the use of the
hardware mixer, instead of the software volume code.

This is hardware specific, and assumes linear volume control.  This is
not the case for hardware mixers which were tested, making this patch
somewhat useless, but we will use it to experiment with the settings,
to find a good solution.
This commit is contained in:
Max Kellermann
2010-02-16 08:55:37 +01:00
parent 48b49e2303
commit 96493e0333
8 changed files with 116 additions and 6 deletions
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6
doc/mpd.conf.5
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@@ -270,6 +270,12 @@ audio that is sent to the audio output device. See documentation for the
whatever audio format is passed to the audio output.
Any of the three attributes may be an asterisk to specify that this
attribute should not be enforced
.TP
.B replay_gain_handler <software, mixer or none>
Specifies how replay gain is applied. The default is "software",
which uses an internal software volume control. "mixer" uses the
configured (hardware) mixer control. "none" disables replay gain on
this audio output.
.SH OPTIONAL ALSA OUTPUT PARAMETERS
.TP
.B device <dev>