Hi Peter,
Thanks for quick response. I understood some what from your mail.
I will explain, how my hardware is connected.
USB GSM chip -> McBSP3
McBSP2 -> TWL4030
Here, playback functionality will not be there in the GSM path. I need to take audio data from GSM. and redirect this to TWL4030 codec.
The thing is, How and where to implement this GSM path without playback? as I am new to this ASoC framework.
What I understood from ur mail is. Audio is being redirected from the application space i.e arecord will record and store in buffer and this buffer is
being played using aplay to other hardware (twl4030).
Can we handle the same thing in kernel space ( i.e in driver itself).
Regards, Shariff
On Thu, Jun 25, 2009 at 4:05 PM, Peter Ujfalusi peter.ujfalusi@nokia.comwrote:
On Thursday 25 June 2009 12:47:54 ext shariff wrote:
Hi all,
Iam working on OMAP3 based custom board. On our board, GSMdigital
audio path is connected to McBSP3 and TWL4030 digital audio path is connected to McBSP2.
I want to implement a module that transfers GSM audio data and store
audio
data into some buffer and redirect it to TWL4030 audio codec through McBSP2.
I question is how can I implement this in ASoC?
I studied ASoC framework, but I am unable to understand where to
implement
my stuff.
I think the following should do something like that:
arecord -Dplughw:0.0 | aplay -Dplughw:0.1 or arecord -Dhw:0.0 | aplay -Dhw:0.1
I don't know what is the order of the PCMs with the twl4030 codec on your board, this is with the assumption: plughw:0.0 - Voice PCM (McBSP3) plughw:0.1 - Digital audio PCM (McBSP2)
You might want to try the --rate parameter for arecord to use 16KHz recording from the Voice interface..
Regards, Shariff _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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