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.
Thanks Sing