At Tue, 01 Nov 2011 21:57:30 +0100, Clemens Ladisch wrote:
On 10/31/2011 01:10 PM, Daniel Mack wrote:
@@ -276,6 +312,15 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) || (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) && altsd->bNumEndpoints >= 2) {
switch (subs->stream->chip->usb_id) {case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */case USB_ID(0x0763, 0x2081):ep = 0x81;iface = usb_ifnum_to_if(dev, 2);alts = &iface->altsetting[1];Better check that the device actually has these descriptors.
+int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd) +{
- case SNDRV_PCM_TRIGGER_START:
err = start_endpoints(subs);The trigger callback should execute very quickly; the initial URB submission should be handled in the prepare callback.
Indeed this is a PITA since long time ago... In general, it's wrong to do it in prepare callback. But we had to do just as a workaround.
Clemens, I thought you wanted to implement some framework for such devices?
thanks,
Takashi