On Thu, 13 Sep 2012, Clemens Ladisch wrote:
> Alan Stern wrote:
> > If instead I do "echo 2 3000 >test" then the next URB is submitted 3
> > frames too late. Since the URB contains only 3 packets, all of its
> > slots have already expired. The submission fails and the audio stops
> > playing, although the ogg123 program continues running and the synch
> > URBs continue to be submitted.
>
> You might try this untested patch (ogg123 should then restart):
>
> --- a/sound/usb/endpoint.c
> +++ b/sound/usb/endpoint.c
> @@ -386,7 +386,7 @@ static void snd_complete_urb(struct urb *urb)
> return;
>
> snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err);
> - //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
> + snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
This doesn't compile because substream is undefined. I tried the
following instead:
--- usb-3.6.orig/sound/usb/endpoint.c
+++ usb-3.6/sound/usb/endpoint.c
@@ -376,7 +376,7 @@ static void snd_complete_urb(struct urb
return;
snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err);
- //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ snd_pcm_stop(ctx->subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
exit_clear:
clear_bit(ctx->index, &ep->active_mask);
But it caused an immediate oops during testing.
Alan Stern
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