[alsa-devel] Problems with snd_pcm_wait(..)

Hey,

I tried to implement a callback functionality with ALSA based on the example given at http://www.cs.utk.edu/~vose/linux/equalarea.com/alsa-audio.html#interruptex. Especially the while-loop is basically the same in my program. However, it doesn't work. I can trace the program to snd_pcm_wait(..) which just waits endlessly.

The whole thing is called within a thread. The thread is still accessible from elsewhere in the pogram. It's just the snd_pcm_wait(..)-function which does not return although a time-out of 1000 ms is given.

If I don't wait for the device I get the following assertion: pcm.c:1079: snd_pcm_writei: Assertion `size == 0 || buffer' failed.

Any ideas what could be wrong?

greetings.. ..Markus