[alsa-devel] unable to do simultaneous playback and recording

[prashant chopade]

Hello,

As per discussion, I know that ALSA driver does not have support for simultaneous playback and recording.

We are using AD1981B codec, so our hardware has a support for simultaneous playback and recording of an audio.

So what exactly I have to do to get a support for simultaneous playback and recording?
Shall I have to use sound server demons?

Is it really possible to do simultaneous playback and recording in linux?

Thanks & Regards,
Prashant C.


--- On Wed, 19/8/09, Takashi Iwai <tiwai at suse.de> wrote:

From: Takashi Iwai <tiwai at suse.de>
Subject: Re: [alsa-devel] unable to do simultaneous playback and recording
To: "prashant chopade" <prashantchopade at yahoo.com>
Cc: alsa-devel at alsa-project.org
Date: Wednesday, 19 August, 2009, 5:50 PM

At Tue, 18 Aug 2009 05:05:10 -0700 (PDT),
prashant chopade wrote:
> 
> 
> 
> 
> 
> Hello,
> 
> We using linux-2.6.27 on target board-AT91SAM9263EK.
>  We are using ALSA library utilities (aplay &
> arecord). But by using these utilities we can’t do simultaneous playback and
> recording.
> 
>  
> 
> We performed following activity to come to this conclusion:
> 
>  
> 
> //At the background we were recording
> 
> #arecord –f cd record_test_file &
> 
>  
> 
> //At the forefront we were playing pre-recorded audio file
> 
> #aplay –f cd pre_recorded_file
> 
>  
> 
> Our observation is that, recording stops when start playing
> file.

In the API side, the above should work fine.  It must be the driver 
that doesn't work with full-duplex.


Takashi
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