[pulseaudio-discuss] [PATCH] Do not use tsched watermark if tsched is disabled

David Henningsson david.henningsson at canonical.com
Wed Sep 1 23:29:02 PDT 2010

2010-09-01 20:06, pl bossart skrev:
>>> Probably either one will work, but if we're about to release 0.9.22
>>> (heard something from Lennart yet?), I suggest we go with my version for
>>> 0.9.22 as that one is the least invasive (only touches non-tsched
>>> devices), and keep Pierre's version in master.
>> Sounds reasonable. Pierre, what's your take?
> That would mean an additional post-release patch for tsched devices. I
> am lazy and would prefer a one-stop fix. I don't care if this is
> David's or mine, as long as the solution works for both cases.
> The only real difference is the bytes/ms parameter. Although ms are
> more intuitive, the bytes makes more sense from a hardware point of
> view. If you pass a parameter in ms, there might be cases where the
> actual number of bytes is lower than the DMA burst, it'll depend on
> what frequency the sink operates at. There are some cases where
> alsa-sink works at 8kHz (BT-SCO) or 48kHz (all other cases), a 6x
> variability in the rewind behavior is difficult to handle.

Fair enough, how about the attached compromise (untested)? If you then
would like to turn the define of dma_rewind_margin_bytes into a
parameter, that should be fairly simple.

David Henningsson, Canonical Ltd.
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