[alsa-devel] "Resource temporarily unavailable" while reading although poll returns POLLIN event

[Stefan Schoenleitner]

Raymond Yau wrote:
> 2010/4/21 Stefan Schoenleitner <dev.c0debabe at gmail.com>
>> If it helps, I pasted the source code here so that you can view it nicely:
>> http://pastebin.com/fCicqctq
>>
> which sound card are you using ?
> 
> The program did not run on my two sound card since you are using 160 frames
> and mono
> 
> are you using "pulse" device for testing since only pulse device return the
> error messages "could not read from capture device: Resource temporarily
> unavailable" ?

Yes, I am using pulseaudio since my hardware sound card (an audigy 2)
does not support the period size I'm using.


The error message above is is from my own program (line 444):

-----------------------------------------------------------------
if ((ret=snd_pcm_readi(capture_device, buffer, 160))<0)
{
	if (ret == -EPIPE)
	{
		fprintf(stderr, "XRUN while reading from capture device: %s\n",
snd_strerror(ret));
		snd_pcm_prepare(capture_device);
		snd_pcm_start(capture_device);
	}
	else
	{
		fprintf(stderr, "could not read from capture device: %s\n",
snd_strerror(ret));
		exit(EXIT_FAILURE);
	}
}
-----------------------------------------------------------------

cheers,
stefan