On Sat, 2003-02-08 at 02:21, Pete Barnard wrote:
> I am using ALSA 0.9.0rc7 and Red Hat Linux 7.2. My sound card is a CS461x.
> My computer is a reasonably powerful beast with 512M of RAM and 1Gig clock
> speed.
> I have written a simple capture program which reads interleaved samples from
> the sound card and goes around in a continuous while(1) loop. My program
> works perfectly - until it crashes after several hours with the message:
>
> "read from audio interface failed: broken pipe".
>
> I have narrowed it down to the following piece of code. The size of buf is 256
>(shorts). Why would the snd_pcm_readi suddenly (randomly?) fail with a broken pipe???
> Any ideas or suggestions would be greatly appreciated as I'm struggling with this
> annoying (and difficult to debug) problem.
>
> Regards,
>
> Pete
>
> while (1)
> {
> if ((err = snd_pcm_readi(capture_handle,buf,128)) != 128
> {
> // this is where it fails after several hours of working
> successfully
> cout << "read from audio interface failed: " << snd_strerror(err) <<
> endl;
> exit(1);
> }
> }
>
If I remember correctly the EPIPE error code is returned when an xrun
occurs. In the case of a read it would be a buffer overrun. Your code
should check for this return value and I believe you have to start the
stream again with "snd_pcm_prepare". Check out the ALSA site for HOWTOs
and the like. Cheers.
Josh Green
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