[pulseaudio-discuss] ALSA sink stuck at 48kHz

[Pierre-Louis Bossart]

On 7/20/2012 1:26 AM, Louis Opter wrote:
> Hello,
>
> I'm running PA 2.0 in system mode with an ALSA sink connected to an USB
> DAC. The USB DAC supports all kind of playback formats and is working
> well on ALSA with mpd (mpd is able to change the output format depending
> on the file it's playing).
>
> However with PA I'm restricted to 48kHz and –while it's working well for
> movies– as soon as I try to play anything at 44.1kHz PA starts
> re-sampling and that doesn't work well with my 400MHz mips CPU.
>
> When I put:
>
> default-sample-rate = 44100
> alternate-sample-rate = 48000
>
> in daemon.conf, PA outputs:
>
> sink.c: Default and alternate sample rates are the same.
>
> And sets the DAC to 48kHz. I also tried to specify the rate argument
> with load-module but it didn't change anything.
>
> If I put:
>
> default-sample-rate = 48000
> alternate-sample-rate = 44100
>
> Then PA doesn't output the error message but never uses the alternate
> sample rate.
>
> I also tried to change the output format with pactl set-sink-formats but
> only managed to segfault it (and I couldn't find any documentation for
> the formats argument).
>
> Before I start to look into the code, is there anything I overlooked
> here?
Weird. Can you try setting both frequencies to 44100 and see what 
happens? I can't think of any reason why this behavior happens.