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

David Henningsson david.henningsson at canonical.com
Thu Apr 2 00:22:52 PDT 2015

On 2015-04-02 00:24, Takashi Sakamoto wrote:
> Hi David,
> On May 31 2015 21:38, David Henningsson wrote:
>> 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?

The second patch works around a bug that could cause multichannel 
devices with different number of playback and record channels (e g, a 
device that can only be opened with 10 out and 6 in and nothing else) 
not to be opened correctly.

David Henningsson, Canonical Ltd.

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