Re: [Alsa-user] rate coverter after dmix

[James Shatto]

On 5/9/17, remu kelly  wrote:
>
> How this can be achieved, seeing that we can't have a plugin after dmix.

Couldn't you use snd-aloop and have a plugin AFTER dmix?  It basically
creates a loopback interface who's output channel is the input
channel.  Although I've never used it (yet).  But one way to pulse
over jack without using the jack module part of pulse.

--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
___
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user

Re: [Alsa-user] rate coverter after dmix

[Clemens Ladisch]

remu kelly wrote:
> I need to implement a rate converter after dmix, means dmix will mix 3
> channels as input, and the output will be of 48KHz, but then i need to
> convert it to 96KHz output and send to HW.

Why do you think you need to do this?

> pcm.sl1{
>type hw
>card 0
>device 0
> }
>
> pcm_slave.sl2 {
> pcm sl1
> rate 96000
> }

This says that the the hardware device must run at 96 kHz.

> pcm.mix1 {
> type dmix
> ipc_key 1024
> slave sl2
> }

Because of the above, the dmix plugin also runs at 96 kHz.

Why don't you want this?


Regards,
Clemens

--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
___
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user

[Alsa-user] rate coverter after dmix

[remu kelly]

Hi,

I need to implement a rate converter after dmix, means dmix will mix 3
channels as input, and the output will be of 48KHz, but then i need to
convert it to 96KHz output and send to HW.
How this can be achieved, seeing that we can't have a plugin after dmix.

or we can do somethings like below:-

pcm.sl1{
   type hw
   card 0
   device 0
}

pcm_slave.sl2 {
pcm sl1
rate 96000
}

pcm.mix1{
type dmix
ipc_key 1024
slave sl2
}

pcm_slave.sl3{
pcm mix1
 }

pcm.play{
   type plug
   slave sl3
   rate_converter "myconverter"
}

here rate converter "myconverter" will be specific to my audio HW.

is the above config allowed?


Regards
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot___
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user