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Date:      Sun, 3 Oct 2021 21:18:40 +0200
From:      Hans Petter Selasky <hps@selasky.org>
To:        J P <webplication@gmail.com>, freebsd-multimedia@freebsd.org
Subject:   Re: tee-like function via virtual_oss
Message-ID:  <03103736-8052-5901-b5bf-288a313af874@selasky.org>
In-Reply-To: <CABcCtURUbpfGk6U7qjycqEoBp5WKOzYUwuJbjMOXqDCMZtKtPQ@mail.gmail.com>
References:  <CABcCtURUbpfGk6U7qjycqEoBp5WKOzYUwuJbjMOXqDCMZtKtPQ@mail.gmail.com>

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On 10/3/21 5:47 PM, J P wrote:
> Hi,
> I need to record what is being played back from a play-only device:
> pcm0: <ATI R6xx (HDMI)> (play) default
> 
> I thought that virtual_oss might come at hand for this and function in a
> "tee-like" fashion but I am unable to have it work.
> 
> My config is as follows:
> -T /dev/sndstat -C 2 -c 2 -r 48000 -b 24 -s 8.0ms -f /dev/null -d dsp5 -M
> x,0,5,0,0,0
> 
> What am I doing wrong?
> 
> It seems that this configuration connects the input of dsp5 to the output
> of dsp0, but I actually need the other way around.
> 
> Thank you.

Hi,

Try this:

virtual_oss -T /dev/sndstat -C 2 -c 2 -r 48000 -b 24 -s 8.0ms -R 
/dev/null -P /dev/dsp0 -d dsp9 -M x,0,0,0,0,0 -M x,1,1,0,0,0

You need two monitor filters, one for each channel.

--HPS



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