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From: Clemens Ladisch <clemens@ladisch.de>
To: Xuebing Wang <xbing6@gmail.com>,
	alsa-devel@alsa-project.org,
	richard Jiang <Richard.Jiang@infocus.com>,
	niranjan Patil <Niranjan.Patil@infocus.com>
Subject: Re: [USB UAC2] How to route pcm stream for UAC2 virtual	sound card for lowest latency?
Date: Tue, 10 Mar 2015 09:30:45 +0100	[thread overview]
Message-ID: <54FEABB5.8060905@ladisch.de> (raw)
In-Reply-To: <54FEAAF5.1090306@gmail.com>

Xuebing Wang wrote:
> I am developing a commercial product based on Freescale iMX6SL + UAC2.
>
> I can get UAC2 working for below command. 'hw:1,0' is the virtual sound card. 'hw:0,0' is the physical sound card.
> export RATE=44100; arecord -D hw:1,0 -c 2 -r $RATE -f S16_LE | aplay -c 2 -r $RATE -f S16_LE &
>
> Any suggestions on what is the best way to get PCM stream from UAC2
> virtual sound card and feed to the physical sound card?

This will not work unless the clocks of the virtual sound card (i.e.,
the USB bus clock) and the clock of the actual sound device are
synchronized.

Otherwise, you have to write your own UAC2 driver.


Regards,
Clemens

      reply	other threads:[~2015-03-10  8:30 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-10  8:27 [USB UAC2] How to route pcm stream for UAC2 virtual sound card for lowest latency? Xuebing Wang
2015-03-10  8:30 ` Clemens Ladisch [this message]

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