On 03/02/2013 09:33 PM, Tanu Kaskinen wrote:
On Sat, 2013-03-02 at 08:56 +0600, Dmitri Paduchikh wrote:
David Henningsson wrote:
Things remaining are:
- First, I'm not sure the calculations are entirely correct. I think I
shouldn't need
to add process_usec to the wakeup, but if I don't I wake up a few samples
before the
stream has finished playback.
Sorry if it is a silly question but couldn't this happen because speed
of time inside sound card is somewhat different from that of system
time?
That sounds plausible. Also, the timeout argument for ppoll() indicates
the *maximum* sleep time. Interestingly, the timeout argument for poll()
indicates the *minimum* sleep time. pa_rtpoll_run() may use either,
depending on the system...
It could be, and there are also these comments later on:
/* Convert from the sound card time domain to the
* system time domain */
/* We don't trust the conversion, so we wake up whatever comes first */
...which doesn't exactly work in our favour here.
Anyway, I need to go back and check more deeply what causes us to wake
up earlier than expected.
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
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