On Mon, Aug 10, 2009 at 3:40 AM, Clemens Ladisch<clemens@xxxxxxxxxx> wrote:
> 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.
ok
>
>> if (sub != substream)
>> snd_pcm_trigger_done(substream, sub);
>
> You can just call snd_pcm_trigger_done() for every substream you handle.
ok
>
>> ...
>> }
>> return 0;
>
> There is no common code for the two substreams.
> Is your hardware actually capable of starting them at exactly the same
> time?
Sync start is working. This is in the loop and starts the streams:
bcom_enable(s->bcom_task);
s is set to two different values in the loop.
I'm having problems with the drain error on stop.
>
>
> Best regards,
> Clemens
>
--
Jon Smirl
jonsmirl@xxxxxxxxx
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