[pulseaudio-discuss] alsa pulse bugs

Colin Guthrie gmane at colin.guthr.ie
Tue May 6 18:45:57 PDT 2008

Cross posting Lennart's reply to the Alsa list as requested.

Please can you guys apply #3942 and #3944 (see below), as per Lennart's 

Cheers :)


Lennart Poettering wrote:
> On Mon, 05.05.08 10:34, tom at dbservice.com (tom at dbservice.com) wrote:
>> I reported three bugs to the alsa bugtracker:
>> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3942
> I though I already posted a patch like this a while back. This really
> should be merged!
>> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3943
> This is not correct. snd_pcm_delay() is the delay that it takes until
> a sample you write now to the PCM stream takes to be played. For PCI
> devices this is usually the same as write_index-read_index, but not
> for virtual devices like PA, and not even for USB.
> This is the only way snd_pcm_delay() has any value for synchronization
> purposes (i.e. syncing video to audio).
> I think there's simply in invalid assumption made by the WINE devs (or
> possible even the MS devs who designed the API): they assume that all
> sound cards are PCI sound cards. Which ain't really true.
> In short: the transport latency *needs* to be taken into account,
> there is no way around this.
>> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3944
> This looks good to me and should also be applied.
> Could you please post the patch for 3942 and 3944 to the ALSA ml? The
> truth is that the ALSA devs are very good at ignoring the ALSA BTS. If
> you want your stuff merged, post it to the ALSA ML, don't bother with
> the BTS.
> And thank you very much for your patches!
> Lennart

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