No way to get notified of playback progress

[GitHub issues - opened]

alsa-project/alsa-lib issue #54 was opened from wm4:

See subject. There is a way to run user code in a signal handler with snd_async_add_pcm_handler(). But that seems extremely questionable, is for sure not supported everywhere, and is probably full of subtle synchronization bugs. There is snd_pcm_poll_descriptors() and related, but that seems to signal only whether at least 1 period is available, nothing else. Judging from the docs.

That seems like a rather big missing thing - I probably overlooked something. Otherwise this is a feature request for an asynchronous notification on period boundaries/underruns/device disconnection, that does not run in a UNIX signal handler. Maybe something relatively similar to that poll() mechanism.

Issue URL     : https://github.com/alsa-project/alsa-lib/issues/54
Repository URL: https://github.com/alsa-project/alsa-lib