[vbox-dev] PulseAudio support rewrite [Patch]

Arthur Taylor art at ified.ca
Fri Jan 8 20:45:05 PST 2010


> Yes, when setting maxlength and tlength to -1, PulseAudio 0.9.21
> will select some sane default values, 4MB for maxlength and 250ms
> for tlength. But these default settings are not implemented for
> older releases, in particular not for version 0.9.10 I'm using here.
> Setting maxlength to -1 is not allowed if buffer_attr != NULL. Therefore
> I've changed the values for tlength to 100ms and maxlength to 3/2 of
> tlength as it was before. I've not changed your default values for
> audio input as I did not test audio input yet.

I remember that bug now, it appears to have been fixed from 0.9.11 on.
I had a look at the record metrics again and changed them in this
patch to be the same, where the fragsize is the same as the config
struct value, and the maxlength is 3/2 that.

> Sure, I've just committed the current state of affairs, see
>  http://www.virtualbox.org/changeset/25678

Yay. Contributing to VirtualBox has been a nicer experience than most
of my dealing with large projects. I have another small patch to
submit for though. Changes include the aforementioned changed to
record buffer metrics, as well as removal of pulse_ctl() and
associated enumeration in favor of using the stream_success_callback
for error detection. This does make log output less descriptive
though. An issue which still probably needs addressing is the handling
of errors. Currently all errors (such as connection termination, or
stream read/write failures) are treated fatal and the machine will
stop. Perhaps this should be handled so that audio stops but the
machine can continue to run?

- Art

Arthur Taylor
art at ified.ca
theycallhimart at gmail.com
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