Commit f15cfca8 authored Oct 25, 2020 by Keith Winstein Committed by Takashi Iwai Oct 27, 2020

ALSA: usb-audio: Add implicit feedback quirk for Zoom UAC-2



The Zoom UAC-2 USB audio interface provides an async playback endpoint
("1 OUT (ASYNC)") and capture endpoint ("2 IN (ASYNC)"), both with
2-channel S32_LE in 44.1, 48, 88.2, 96, 176.4, or 192
kilosamples/s. The device provides explicit feedback to adjust the
host's playback rate, but the feedback appears unstable and biased
relative to the device's capture rate.

"alsaloop -t 1000" experiences playback underruns and tries to
resample the captured audio to match the varying playback
rate. Forcing the kernel to use implicit feedback appears to
produce more stable results. This causes the host to transmit one
playback sample for each capture sample received. (Zoom North America
has been notified of this change.)

Signed-off-by: Keith Winstein <keithw@cs.stanford.edu>
Tested-by: Keith Winstein <keithw@cs.stanford.edu>
Cc: <stable@vger.kernel.org>
BugLink: https://lore.kernel.org/r/20201027071841.GA164525@trolley.csail.mit.edu


Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent 2a6eca16

sound/usb/pcm.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -352,6 +352,10 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
		ep = 0x81;
		ifnum = 2;
		goto add_sync_ep_from_ifnum;
		case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
		ep = 0x82;
		ifnum = 2;
		goto add_sync_ep_from_ifnum;
		case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
		case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
		ep = 0x81;

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