[alsa-devel] Trying to understand alsa
aeikum at codeweavers.com
Fri Jan 13 16:10:58 CET 2012
On Thu, Jan 12, 2012 at 11:16:47PM +0000, Jonathan Andrews wrote:
> On Thu, 2012-01-12 at 16:12 -0600, Andrew Eikum wrote:
> > On Thu, Jan 12, 2012 at 09:44:11PM +0000, Jonathan Andrews wrote:
> > > I have an application that works using 512 sample packets of 22050Hz 16
> > > bit mono audio. The 'receiver' takes many audio streams from a network
> > > via UDP, at the moment it pipes them into pulse.
> > >
> > > Can alsa buffer audio. At the moment every time I and set an audio
> > > buffer size I get a negative response from
> > > snd_pcm_hw_params_set_buffer_size . I'm somewhat confused about the
> > > units alsa uses ...
> > >
> > You don't want to over-specify your requirements. You require a buffer
> > size of "at least" 3 * 512 frames. So use set_buffer_size_min().
> I cant find any reference to "set_buffer_size_min" in the ALSA API
> documentation I have or the link you provided ?
> snd_pcm_hw_params_set_buffer_time_near() is the closest and that seems
> to take an argument in useconds.
The doxygen docs are split strangely. The function is documented here:
I find keeping the alsa-lib source on hand for quick grepping is often
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