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From: Rajeev kumar <rajeev-dlh.kumar@st.com>
To: Ashish Chavan <ashish.chavan@kpitcummins.com>
Cc: alsa-devel <alsa-devel@alsa-project.org>,
	Mark Brown <broonie@opensource.wolfsonmicro.com>,
	"; Liam Girdwood" <lrg@slimlogic.co.uk>
Subject: Re: Does ASoC support sound card with multiple interfaces?
Date: Wed, 4 Jan 2012 11:17:55 +0530	[thread overview]
Message-ID: <4F03E80B.907@st.com> (raw)
In-Reply-To: <1325655413.12508.79.camel@matrix>

Hello Ashish

On 1/4/2012 11:06 AM, Ashish Chavan wrote:
>>>    I have a codec with multiple TX and RX channels. In ASoC tree, I have
>>> seen examples where these kind of codecs are implemented as multichannel
>>> codecs. Instead I want it to be treated as card with multiple
>>
>> Yes, this is totally supported.  There are quite a few examples of this
>> in the tree.  Your CODEC driver should just implement one DAI per audio
>> interface.
>>
>
> Thanks.
>
> I am looking at some of the examples in the tree and have a small query.
> I want to know how alsa-utils (aplay, arecord) will behave when a codec
> driver supports multiple DAIs. For example, let's assume that a codec
> driver implements two DAIs, both capable of doing stereo playback. Then
> I try to play two files simultaneously using aplay, e.g.
>
> $ aplay x.wav
> $ aplay y.wav
>
> AFAIK first "aplay" will result in play back on default interface/DAI
> (i.e. 0). What will happen with second aplay? Will it automatically find
> a free DAI to playback?

No,

  or it is mandatory to explicitly specify the
> PCM/card # for second aplay?
>

You need to redirect it . You can use

aplay -Dplughw:0,1 x.wav.

Here '0' indicated card number and '1' indicates device number

~Regards
Rajeev


> Similarly what will happen in case of arecord when a codec supports
> multiple DAIs capable of capturing?
>
>
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>

  reply	other threads:[~2012-01-04  5:48 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-02 15:06 Does ASoC support sound card with multiple interfaces? Ashish Chavan
2012-01-02 20:16 ` Mark Brown
2012-01-04  5:36   ` Ashish Chavan
2012-01-04  5:47     ` Rajeev kumar [this message]
2012-01-04  7:00       ` Ashish Chavan
2012-01-04  7:03         ` Rajeev kumar
2012-01-05  6:02         ` Mark Brown

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