[pulseaudio-discuss] [PATCH 1/2] alsa-mixer: Fix reference to too high channel numbers

[Raymond Yau]

2016-03-09 4:52 GMT+08:00 Tanu Kaskinen <tanuk at iki.fi>:

> On Wed, 2016-03-09 at 00:28 +0800, Raymond Yau wrote:
> > > > Alsa mixer api just combine volume control and mute switch with same
> name
> > > > to an element,
> > > >
> > > > Is it possible that  these two control have different number of
> channels
> > > > for some sound card ?
> > > I don't know if it's possible, but the PulseAudio code works in any
> > > case, because the switch handling code doesn't depend on how many
> > > channels the corresponding volume element has.
> > >
> > Do you mean that side speakers still have sound when selecting 5.1
> profile
> > when user have 7.1 speakers since alsa snd hda intel driver use copy
> front?
>
> I don't know what "copy front" means. I sure hope that it doesn't mean
> that the driver copies audio from the front speakers to the side
> speakers when pulseaudio uses the "surround51" device.
>

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/hda_codec.c?id=4b3acaf5b56f53ef259a6ddf8e17dcb529631d9b


hda-codec - Feed front signals to all surrounds

>
>
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