10 Aug
2009
10 Aug
'09
9:40 a.m.
Jon Smirl wrote:
Here's how I implemented sync start/stop.......
Have a look at oxygen_trigger() in sound/pci/oxygen/oxygen_pcm.c for a working sync start/stop implementation.
snd_pcm_group_for_each_entry(substream, sub) {
rtd = substream->private_data;
There is no guarantee the all linked substreams belong to the same card or the same driver; you have to check that first and ignore streams you don't know about.
if (sub != substream) snd_pcm_trigger_done(substream, sub);
You can just call snd_pcm_trigger_done() for every substream you handle.
...} return 0;
There is no common code for the two substreams. Is your hardware actually capable of starting them at exactly the same time?
Best regards, Clemens