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

[prashant chopade]

Hello,

My understandings:

>Define your meaning of "simultaneous playback and recording" more
>exactly.

I mean: Playing audio file stored on disk on speaker and at the same time recording audio from MIC and storing it on disk.

I don,t want to do multiplayback, I mean i don,t want to play two or more audio files at a time.

So you are saying that my driver(ATMEL-AT91SAM9263-AC97c) is not supporting the full duplex mode?

Thanks & Regards,

Prashant C.

>prashant chopade wrote:
> 
> Hello,
> 
> As per discussion, I know that ALSA driver does not have support for
> simultaneous playback and recording.

Huh?  The full-duplex is of course supported.
Your example shown in the thread doesn't indicate the multi playbacks
or so.

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

I think you are confused.


> 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?

Define your meaning of "simultaneous playback and recording" more
exactly.

If it's about full-duplex, the answer is definitely yes.
If it's multi-streams, the answer is yes, but there are
 choices, e.g.
dmix/dsnoop plugin or a sound server.


Takashi


> 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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