[pulseaudio-discuss] Listening to in-band audio from an output?

[Arun Raghavan]

Hi Craig,

On 3 February 2014 21:13, Craig Matsuura <cmatsuura at vivint.com> wrote:
[...]
> pactl load-module module-loopback
> source="alsa_input.pci-0000_00_1b.0.analog-stereo"
> sink="alsa_output.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.iec958-stereo"
> pactl load-module module-loopback
> source="alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono" sink="alsa_output.pci-0000_00_1b.0.analog-stereo"
>
> The above two commands allow me to connect the sink/source from one card
> to another.  I now want to listen in-band and detect DTMF tones or
> possibly other audio capture.  How can I do this keeping my two cards
> connected as above?

Any reason you couldn't just run a capture stream as you normally
would on the source(s) that you want to listen in on?

Cheers,
Arun