[alsa-devel] unable to do simultaneous playback and recording
prashantchopade at yahoo.com
Thu Aug 20 12:05:41 CEST 2009
>Define your meaning of "simultaneous playback and recording" more
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 chopade wrote:
> 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
> 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
Define your meaning of "simultaneous playback and recording" more
If it's about full-duplex, the answer is definitely yes.
If it's multi-streams, the answer is yes, but there are
dmix/dsnoop plugin or a sound server.
> 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.
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