[etoys-notify] [JIRA] Created: (SQ-638) snd_pcm_avail_update() needs to be called in vm-sound-ALSA

Sayamindu Dasgupta (JIRA) tracker at squeakland.org
Wed Dec 16 16:37:38 EST 2009


snd_pcm_avail_update() needs to be called in vm-sound-ALSA
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                 Key: SQ-638
                 URL: http://tracker.squeakland.org/browse/SQ-638
             Project: squeakland
          Issue Type: Bug
          Components: etoys-sugar
            Reporter: Sayamindu Dasgupta
         Attachments: dlo_9375.patch

In XO 1.5, the the sounds produced in Etoys and Scratch are jumpy (http://dev.laptop.org/ticket/9375). It turns out that the issue is solved by calling snd_pcm_avail_update() after calling snd_pcm_delay() in squeak/platforms/unix/vm-sound-ALSA/sqUnixSoundALSA.c

This seems to be consistent with the ALSA documentation (http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m.html#g41ca534658076885d9b077ad674750cd) which says about snd_pcm_avail_update():

"Also this function might be called after snd_pcm_delay() or snd_pcm_hwsync() functions to move private ring buffer pointers in alsa-lib (the internal plugin chain)."

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