27 Mar
2006
27 Mar
'06
6:39 a.m.
kurmisk wrote:
I have write my small _alsa_test_program_.
[C code ckunkz see below]
It works good but now i wanna before call
rc = snd_pcm_writei(handle, buffer, frames);
somehow check - is sound device free for this call or not.
You could call snd_pcm_avail_update().
If you don't want the write function to block, you can set the device to
non-blocking mode, then snd_pcm_writei() will only write as much data as
can be written without waiting, or will return -EAGAIN if there isn't
free space at all.
You can use snd_pcm_poll_descriptors() to get file handle(s) for polling
(poll() is preferred over select()).
HTH
Clemens