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. Regards, Clemens