Default Sample rate for Pulse Audio/Jack etc.

David Henningsson david.henningsson at
Tue Jan 8 07:50:00 UTC 2013

2013-01-08 00:45, Len Ovens skrev:
> On Mon, January 7, 2013 5:14 am, David Henningsson wrote:
>> On 01/07/2013 08:38 AM, ttoine wrote:
>>> Maybe we can let 44.1khz for Pulse Audio because most of what we are
>>> listening to are this way.
>> As of PulseAudio 2.0 (i e Ubuntu 12.10 and up), PulseAudio should
>> automatically switch between 44100 and 48000 depending on the source
>> material. I don't know how much tested this feature is though.
> Do you mean Pulse will change the output device rate depending on what is
> playing? That sounds like it would break the jack/PA dbus interface. (even
> more than it is now) Maybe not. What will it do with things like gphone or
> skype where the incoming audio may be at 44.1k but the mic runs at 48k
> (only)? This is not uncommon BTW. I have already had to change the default
> on my netbook in pulse so that the built in mic would work.

PulseAudio would not switch to something the backend/driver/hardware 
would not support. In the case of Jack, PA's backend only supports the 
sample rate that Jack is configured to.

In the case of your built in mic, this sounds like a bug in the driver 
(or hardware), if the driver says that it supports 44100 where in fact 
it does not.

David Henningsson, Canonical Ltd.

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