At Tue, 26 Apr 2011 10:01:23 +0200, David Henningsson wrote:
On 2011-04-22 01:25, Raymond Yau wrote:
2011/4/21 David Henningssondavid.henningsson@canonical.com
Due to a round-off error, snd_pcm_avail could in some cases return 0 even though more data could be written to the stream.
This was discovered by Maarten Lankhorst [1], and there is also a test program available that triggers this error [2].
[1] https://tango.0pointer.de/pipermail/pulseaudio-discuss/2011-April/009935.htm...
[2] https://tango.0pointer.de/pipermail/pulseaudio-discuss/attachments/20110420/...
if the test program can force under-run occur with "hw" device and "pulse" device with his patch in https://tango.0pointer.de/pipermail/pulseaudio-discuss/2011-April/009918.htm...
Is it normal that underrun does not occur with the test program and your patch
Yes; underruns are not reported to the application due to the risk of the underrun being obsolete at that time. As for Maarten's patch in the post you refer to,
- if underruns are being reported (this is configurable), it might be a
good idea to call "pulse_start".
- it changes underruns to being reported by default, which is what I'm
opposed to.
Applied now. Thanks.
Takashi