[meta-freescale] Audio stream routing

[Ray·Bloodworth]

Hi, Alexander, Dmitriy Beykun

    Thanks for your reply!
    I ask question here because I'm using MCIMX6Q-SDP.
    From your answer I understand that both pulseaudio and alsa can route audio stream.
    In my case, I will do it in pulseaudio.
    Actually, I want to porting imx6q multi-media to tizen IVI.
    Tizen ivi profile has murphy to control resources which include audio stream.
    
    Tizen IVI community has told me that I should config pulseaudio-murphy-ivi plugin. I will try this one.

    Thanks!



Ray·Bloodworth

 
From: Alexander Shashkevych
Date: 2014-12-09 21:33
To: Dmitriy B.
CC: meta-freescale at yoctoproject.org; Ray·Bloodworth
Subject: Re: [meta-freescale] Audio stream routing
>> >      This is a question about audio stream routing.
>> >
>> >      Soft arch:
>> >      gstreamer--->pluseaudio--->alsa
>> >
>> >      There are two media players playing different mp3 files at the same
>> > time. How to route them to different sound card?
>> >      Where should I config the route? pluseaudio or alsa?
>>
>> Hi,
>>
>> Alsa is api for direct communication with audio devices (no less, no
>> more)
> You can downmix and resample things using alsa. google for dsnoop, dmix,
> plughw, resample standard alsa plugins, everything is configurable, you can
> make pretty complicated things using alsa. There is no need for pulseaudio
> unless you really need it. Especially in embedded applications when sound
> configuration is predefined.
 
You are right of course, but alsa-way requires more efforts to
configure such setups. Considering how initial question was
formulated, I've provided simplest possible answer. I just assumed
that Ray had no clear understanding how pulseaudio and alsa are
working by asking such questions, since they are suppose basic linux
knowledge.
 
>> routing can be done with pavucontrol.
> Routing is configurable using pacmd. Here is an example output
> http://pastebin.com/85V6qmZX
> pavucontrol is just a gui frontend for API, you don't necessarily need it.
>> PS: Actually this question is not imx/freescale specific, so this
>> mailing list is not best place for it.
> Not sure about it, I've done couple systems with SGTL5000 and other codecs
> using i.MX'ses and there were some issues here and there, so it is perfectly
> fine to discuss embedded setup here. There is even an .asoundrc files
> somewhere in meta-freescale with predefined values for one of the sabre
> series board (iirc using fsl alsa resampling plugin that makes use of i.MX
> internal digital audio resampler).
 
I hope Ray now has complete answer. :)
 
Alexander
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