[pulseaudio-tickets] [Bug 88827] a2dp skips terribly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88827

--- Comment #7 from Tanu Kaskinen <tanuk at iki.fi> ---
(In reply to R Schultz from comment #6)
> What needs to be done to continue troubleshooting the issue?

I think it would be good to gather detailed timestamped data about the various
events that are related to bluetooth streaming. The "Skipping NNN us (= MMM
bytes) in audio stream" log message that is mentioned in the Ubuntu bug title
suggests that the buffer behind the bluetooth socket stays full for prolonged
periods, so PulseAudio is simply unable to write any data. It would be good to
verify this with hard data.

Someone could try changing the A2DP writing logic so that PulseAudio would
always write immediately when the socket becomes writable. That would eliminate
the possibility that PulseAudio doesn't write fast enough. module-sine could be
used for testing, because that module should be able to provide data no matter
how weird the sink timing is (I'm worried that regular applications might have
trouble keeping their buffers filled if the bluetooth writes happen in big
bursts).

If it turns out that there are drop-outs no matter how quickly PulseAudio
writes data, then the next step would be to investigate at the kernel side.

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