On Thu, 14 Jan 2010, Singaravelan Nallasellan wrote: > Hi, > > Our audio driver uses the indirect PCM data transfer mechanism to > transfer the buffer pointers and the size of the buffer to the Audio > engine which DMAs the PCM data to the sound card. > > The driver uses the .ack callback to receive the buffer pointer and > the size. It also sends it to the audio engine. > > We are facing a problem when we play long wav file using our driver. > > The application has written the PCM data and the ring buffer is full. > snd_pcm_avail_update returns 0 sporadically. But the .ack callback was > not called. The playback is stuck. It is not progressing. > > I have tried with pulseaudio (0.9.15) and with my own player. Both > gives the same result. > > I would appreciate if somebody could provide some pointer to identify > the cause of this issue. Let me know if anybody needs more info. No idea. You may put some debug printk lines to snd_pcm_lib_write1() routine if all correspoding write sequences ends with ->ack callback call. Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
