19.12.2014 18:15, Tanu Kaskinen wrote:
On Thu, 2014-12-11 at 21:49 +0900, 김정연 wrote:
Dear developers,
I have question something about selecting logic between timer-based
and IRQ scheduling.
When I tried to load 'module-alsa-sink' with 'mmap=0 tsched=1'
parameters, tsched(timer-based scheduling) becomes disabled by below
codes.
It seems tsched is allowed only mmap supported ALSA devices. Why
tsched disabled while use non-mmap driven ALSA?
Because rewinding is not available in non-mmap mode. That is, it's not
possible to rewrite previously written data in non-mmap mode. In
timer-based scheduling mode PulseAudio uses bigger buffer size, which
causes problems if rewinding isn't available.
Sorry, rewinding is actually available in non-mmap mode. And, pulseaudio
can rewind even without tsched (i.e., tsched == 0 does not imply
max_rewind == 0). So the reasoning must be different. But I don't know
the answer.
--
Alexander E. Patrakov
_______________________________________________
pulseaudio-discuss mailing list
pulseaudio-discuss@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
