2010/7/10 David Henningsson launchpad.web@epost.diwic.se
PA developer often complain the driver did not provide accurate playback position by the pcm_pointer callback
Did the pulse_pointer callback also provide accurate position of the
pulse
device ?
Yes, but it provides the pointer to the fake ring buffer (the alsa-lib plugin system expects that all pcm plugins are ring buffers, which seems to me like a design flaw).
This mean that pulse_pointer jump suddenly when PA wake up from sleep and write audio to sound card until the ring buffer is empty, Those "0 bytes in queue " message is the result of PA server flush the ring buffer.
Did alsa-lib regard this condition as underrun, since the application pointer and hardware pointer of the pulse device seem at the same point ?
Is this the reason why alsa-time-test.c fail on the pulse device ?