[alsa-devel] unable to do simultaneous playback and recording
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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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
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 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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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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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
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 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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participants (3)
-
Clemens Ladisch -
prashant chopade -
Takashi Iwai