is there an audio plugin for this?

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is there an audio plugin for this?

Andres Gonzalez
Hi,

As we are all well aware, most of the general purpose audio capture cards are very restrictive. They have 2 physical analog inputs one for Right and one for Left of a single stereo signal, and the 2 inputs cannot be controlled or configured differently from each other.

I want to be able to treat these 2 inputs as 2 separate mono inputs, where each can feed separate and distinct 2 channel mono feeds downstream. Essentially, I want the option to copy over all of the left channel audio samples to the right channel, or all of the right channel audio samples to the left channel.  In other words, the option is to remove one channel's audio and provide 2 channel mono audio of the other channel's audio downstream.

Is there an audio plugin for this?  I have looked at audiointerleave and it appears that it might do what I want but there is no detailed description in the documentation of what it does so I am not sure.

Thanks,
-Andres
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Re: is there an audio plugin for this?

Carlos Rafael Giani
You are close. You need the *de*interleaver. Here is one example that
outputs both mono streams as graphical waveforms:


gst-launch-1.0 audiotestsrc ! "audio/x-raw, channels=2" ! deinterleave
name=i   \
     i. ! queue ! "audio/x-raw, channels=1" ! audioconvert dithering=0 !
"audio/x-raw, channels=2" ! wavescope ! videoconvert ! autovideosink   \
     i. ! queue ! "audio/x-raw, channels=1" ! audioconvert dithering=0 !
"audio/x-raw, channels=2" ! wavescope ! videoconvert ! autovideosink

So, here, deinterleave first splits up the channels, and then the
individual audioconvert elements convert mono to stereo by duplicating
samples. (I set dithering to 0 since I want audioconvert to strictly
duplicate samples, nothing else.)


On 2017-08-11 17:47, Andres Gonzalez wrote:

> Hi,
>
> As we are all well aware, most of the general purpose audio capture cards
> are very restrictive. They have 2 physical analog inputs one for Right and
> one for Left of a single stereo signal, and the 2 inputs cannot be
> controlled or configured differently from each other.
>
> I want to be able to treat these 2 inputs as 2 separate mono inputs, where
> each can feed separate and distinct 2 channel mono feeds downstream.
> Essentially, I want the option to copy over all of the left channel audio
> samples to the right channel, or all of the right channel audio samples to
> the left channel.  In other words, the option is to remove one channel's
> audio and provide 2 channel mono audio of the other channel's audio
> downstream.
>
> Is there an audio plugin for this?  I have looked at audiointerleave and it
> appears that it might do what I want but there is no detailed description in
> the documentation of what it does so I am not sure.
>
> Thanks,
> -Andres
>
>
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/is-there-an-audio-plugin-for-this-tp4684165.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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Re: is there an audio plugin for this?

Nicolas Dufresne-5
In reply to this post by Andres Gonzalez
Le vendredi 11 août 2017 à 08:47 -0700, Andres Gonzalez a écrit :

> Hi,
>
> As we are all well aware, most of the general purpose audio capture cards
> are very restrictive. They have 2 physical analog inputs one for Right and
> one for Left of a single stereo signal, and the 2 inputs cannot be
> controlled or configured differently from each other.
>
> I want to be able to treat these 2 inputs as 2 separate mono inputs, where
> each can feed separate and distinct 2 channel mono feeds downstream.
> Essentially, I want the option to copy over all of the left channel audio
> samples to the right channel, or all of the right channel audio samples to
> the left channel.  In other words, the option is to remove one channel's
> audio and provide 2 channel mono audio of the other channel's audio
> downstream.
>
> Is there an audio plugin for this?  I have looked at audiointerleave and it
> appears that it might do what I want but there is no detailed
You want the other way around, see deinterleave. I use that for an 8
channel codec that drives secretly different independent inputs. Note
that pulse audio can also do that for you, and will expose it in a much
simpler to use way.

>
>  description in
> the documentation of what it does so I am not sure.
>
> Thanks,
> -Andres
>
>
>
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/is-there-an-audio-plugin-for-this-tp4684165.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
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