[alsa-devel] virtual sound driver

Liu, George yueliu at lab126.com
Tue Jul 24 02:15:02 CEST 2012

I installed aloop driver, and selected it as the default Audio input and output device.

Then, I played a pcm file while also started recording (using the sound recorder in Ubuntu 11.04). I'm expected to record what I'm playing, but there's no sound in the captured wav file. 
Did I do anything wrong?

I want to use aloop or dummy driver as the starting point to write my own driver. 
Thanks for helping me out.

-----Original Message-----
From: alsa-devel-bounces at alsa-project.org [mailto:alsa-devel-bounces at alsa-project.org] On Behalf Of Takashi Iwai
Sent: Saturday, July 21, 2012 1:28 AM
To: Liu, George
Cc: alsa-devel at alsa-project.org
Subject: Re: [alsa-devel] virtual sound driver

At Fri, 20 Jul 2012 18:05:40 -0700,
Liu, George wrote:
> I'm trying to write a virtual sound driver to capture PCM data.
> How do I modify dummy.c to capture PCM into buffer?
> Does the PCM data ever sent to any of the pcm_op call backs? There's no read/write callbacks?

Did you take a look at aloop driver?

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