[pulseaudio-tickets] [Bug 53068] New: alternate sample rate doesn't work for simultaneous playback/capture on SoC I2S

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=53068

             Bug #: 53068
           Summary: alternate sample rate doesn't work for simultaneous
                    playback/capture on SoC I2S
    Classification: Unclassified
           Product: PulseAudio
           Version: unspecified
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: alsa
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: pmeerw at pmeerw.net
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


Date: Fri, 27 Jul 2012 21:49:22 +0200 (CEST)
From: Peter Meerwald <pmeerw at pmeerw.net>
To: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Cc: pulseaudio-discuss at lists.freedesktop.org
Subject: Re: [pulseaudio-discuss] alternate sample rate

Hello Pierre-Louis,

> > the command I test is a loopback (just playback or capture works fine):
> > pacat -r -d alsa_input.platform-soc-audio.analog-stereo | pacat -p -d
> > alsa_output.platform-soc-audio.analog-stereo

> It could be that your hardware does not let you reconfigure the input and
> output independently? I am afraid I didn't think about this case when I wrote
> the patches, but if you have a synchronous 4-pin I2S on our SOC without
> sample-rate conversion support the frequency needs to be updated for capture
> and playback, not one after the other. Can you provide more details on your
> hardware?

hardware is the internal audio codec on a beagleboard-xm; so yes, 4-pin 
I2S

your statement that the capture and playback sampling rate should be 
changed simultaneously makes a lot of sense I think :)

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