[pulseaudio-discuss] [PATCH 0/3] Multichannel fixes

Raymond Yau superquad.vortex2 at gmail.com
Thu Apr 2 01:19:42 PDT 2015

> > About the first patch:
> >
> > I tested and refined a patch previously submitted by Takashi
> > Sakamoto. It seems like nothing has happened on the udev side so I
> > suggest we take this one for now. In case udev should improve and get a
> > model database for the Firewire bus, then we could consider
> > reverting this.
> Thanks for the revised version of my patch (how stupid mistake to use
> 'IO_' instead of 'ID_' in my comment!) and I'm sorry to have little time
> for this issue...
> Well, I want to test this patchset with my devices in this weekend. In
> my understanding, these patches are for devices with different PCM
> channels for playback/capture. In this case, your patch allows
> pulseaudio clients to send/receive the first 4 channels
> (left,right,rear-left,rear-right) to/from the PCM substreams instead of
> using whole channels.
> Is my understanding is correct?

Only tested with snd-dummy with model=ice1712

I expect pulseaudio only use those multi channel profiles only when driver
's channel_min > 2 and channel_min equal to channel_max

So pulseaudio just playback and capture the hardware supported channels
instead of the first 4 channels

Do you mean that you want to play/capture stereo only to/from specified
jack with channel map ?

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