unable to do simultaneous playback and recording

unable to do simultaneous playback and recording

[prashant chopade]

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.

 

Kindly need your guidance for simultaneous playback and
recording of an audio file. 

Appreciates your help if you provide sample test programs (using ALSA API) for recording.




 

Thanks & Regards,

Prashant C.




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Re: unable to do simultaneous playback and recording

[Takashi Iwai]

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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Re: 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@suse.de> wrote:

From: Takashi Iwai <tiwai@suse.de>
Subject: Re: [alsa-devel] unable to do simultaneous playback and recording
To: "prashant chopade" <prashantchopade@yahoo.com>
Cc: alsa-devel@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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Re: unable to do simultaneous playback and recording

[Takashi Iwai]

At Thu, 20 Aug 2009 11:45:40 +0530 (IST),
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


> 
> Thanks & Regards,
> Prashant C.
> 
> 
> --- On Wed, 19/8/09, Takashi Iwai <tiwai@suse.de> wrote:
> 
> From: Takashi Iwai <tiwai@suse.de>
> Subject: Re: [alsa-devel] unable to do simultaneous playback and recording
> To: "prashant chopade" <prashantchopade@yahoo.com>
> Cc: alsa-devel@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
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
> 
> 
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Re: unable to do simultaneous playback and recording

[Clemens Ladisch]

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

ALSA _does_ support full duplex, if the hardware and driver support it.

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

It looks as if your AC'97 controller driver is buggy.


Best regards,
Clemens

Re: 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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Re: unable to do simultaneous playback and recording

[Takashi Iwai]

At Thu, 20 Aug 2009 15:35:41 +0530 (IST),
prashant chopade wrote:
> 
> 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?

Yes.


Takashi

Re: unable to do simultaneous playback and recording

[prashant chopade]

Hello,


How to check my AT91SAM9263-EK - AC97C hardware driver is not supporting simultaneous playback and recording of an audio?

Thanks & Regards,
Prashant C.

--- On Thu, 20/8/09, Clemens Ladisch <clemens@ladisch.de> wrote:

From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: [alsa-devel] unable to do simultaneous playback and recording
To: "prashant chopade" <prashantchopade@yahoo.com>
Cc: "Takashi Iwai" <tiwai@suse.de>, alsa-devel@alsa-project.org
Date: Thursday, 20 August, 2009, 12:19 PM

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

ALSA _does_ support full duplex, if the hardware and driver support it.

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

It looks as if your AC'97 controller driver is buggy.


Best regards,
Clemens
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