In addition, OSS API emulated by ALSA has not this issue. 2008/9/2 Nie Jun <niej0001@xxxxxxxxx>: > Hi, > I found a strange issue that ALSA consume pcm data faster than > normal. Does any one had come across it? > > When I sychronize video frame against audio, the video thread will > check how much pcm data has been written to ALSA API but has not been > fetched by DMA. This query causes ALSA consume pcm data faster than > normal, noise appears too. A stream that is 131 seconds will playback > just 112 seconds. It only appears when audio is stereo and sampling > rate is directly supported by hardware. > > This bug can be reproduced with aplay. To reproduce it with aplay, you > just need to add a thread and query the ALSA latency 20~30times every > second. > > My system: XSCALE PXA300/zylonite, Linux2.6.25, alsa-lib-1.0.13(I > tried alsa-lib-1.0.17, bugs too), codec: wm9713. Linux2.6.14 has this > issue too, but I did not find it in 2.6.21 and 2.6.24. > > Does anyone has idea about it? Thanks! > > Jun Nie > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
