So, when is a PCM ready?
If a PCM is already in SND_PCM_STATE_RUNNING, when is snd_pcm_wait() supposed to return ?
When avail >= avail_min.
1) Does this depend on period size in any way?
For example, if period size is 6000 frames, and I set avail_min to 2000 frames, will snd_pcm_wait() return when avail=2000 or avail=6000 ?
Another example, if persiod size is 1500, and I set avail_min to 2000, will snd_pcm_wait() return when avail=200 or avail=3000 (2*1500)?
2) Is snd_pcm_wait() a call that uses little or no CPU time, much like a poll?
3) It appears from the docs that I can set avail_min at any time, even in SND_PCM_STATE_RUNNING.
commands to set it would be: -
snd_pcm_sw_params_current(this->audio_fd, swparams);
snd_pcm_sw_params_set_avail_min(this->audio_fd, swparams, new_avail_min_size);
snd_pcm_sw_params(this->audio_fd, swparams);
or is there a better way to do it while in SND_PCM_STATE_RUNNING ?
4) If snd_pcm_wait() is waiting, and with another thread we change the avail_min value, will the snd_pcm_wait() use the new value, or is the new value only used on the next call to snd_pcm_wait()
I have discovered a problem with xine when using it. I have done a work around in xine so that dmix now works in xine. I think that my assumptions regarding snd_pcm_wait() might have been wrong, so I want to get accurate details from yourselves.
It also might be a good idea to update the documentation for snd_pcm_wait() with more details.
We had a bug in the resample plugin which causes that snd_pcm_wait() function was broken. Try alsa-lib from CVS.
My current tests were not using the resampler. i.e. app using 48k, sound card using 48k. I will try some tests that would use the resampler.
Jaroslav
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