I have a stream state change callback that fires a signal when the stream is
PA_STREAM_READY, PA_STREAM_FAILED, or PA_STREAM_TERMINATED
When trying to get a ready stream state in pulseaudio, I first wrote this. This
hangs
do {
stream_state = pa_stream_get_state (device.stream);
if (! PA_STREAM_IS_GOOD (stream_state))
{
error_number = pa_context_errno (device.context);
fprintf (stderr, "Could not acquire PulseAudio stream: %s\n",
pa_strerror (error_number));
return;
}
else
{
fprintf (stderr, "PulseAudio stream state is %d.\n",
stream_state);
}
pa_threaded_mainloop_wait (device.mainloop);
} while (stream_state != PA_STREAM_READY);
Then I wrote this, based on the pa_simple code, and this doesn't hang
stream_state = pa_stream_get_state (device.stream);
while (stream_state != PA_STREAM_READY)
{
stream_state = pa_stream_get_state (device.stream);
if (! PA_STREAM_IS_GOOD (stream_state))
{
error_number = pa_context_errno (device.context);
fprintf (stderr, "Could not acquire PulseAudio stream: %s\n",
pa_strerror (error_number));
return;
}
else if (stream_state == PA_STREAM_READY)
break;
else
fprintf (stderr, "PulseAudio stream state is %d.\n",
stream_state);
pa_threaded_mainloop_wait (device.mainloop);
}
Why do I have to explicitly check inside the loop to see if the stream is
ready, and then break? Do I have to have called wait() while the callback
executes?
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