Hi,
check LAD site,
http://www.linuxdj.com/audio/lad/resourceslatency.php3
you'll find some good information how to get low-latency.
Takashi
At Wed, 12 Feb 2003 17:56:19 -0500,
Chris Raphael wrote:
>
>
> Hello List,
>
> This is my first post and I am new (a couple of weeks) to ALSA.
>
> I am working on an application that plays audio output in response
> to audio input --- the relationship between input and output is
> complicated and I will not describe it in any detail here --- I
> am building a musical accompaniment system. I want the output to "respond"
> to the input with low latency so I cannot write the output samples
> very long before they are actually going to be played. Currently
> I have a function that is called repeatedly (through a signal) and
> writes the samples about .05 secs before they will actually be played.
> I monitor the delay, in samples, (I can't remember the name of the
> function (snd_delay_???) and see that the number of unplayed samples
> fluctuates but there does not seem to be an increasing or decreasing
> trend. So I assume that I am writing at very close to the right
> rate and mostly the playback sounds fine. But every so often,
> maybe once every 10 secs or so, I get a playback underrun. I
> always check the system clock when my writing routine begins,
> so I know the underruns are almost always *not* due to my writing
> routine getting a late callback. By everything I can measure, the
> samples are written on time. Can anyone tell me what I need to do
> to fix this problem? Perhaps it is not reasonable of me to hope to
> write samples such a short time before they need to be played?
>
> I would really appreciate any help I can get on this and will supply
> any relevant details. I just didn't want to clutter up my question
> with lots of irrelevant info.
>
> Thanks,
>
> Christopher Raphael
>
>
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