[pulseaudio-discuss] Map sink-input to virtual microphone

[guest271314]

This is the code that I cobbled together from your post,
https://askubuntu.com/questions/60837 and
https://aweirdimagination.net/2020/07/19/virtual-microphone-using-gstreamer-and-pulseaudio/

pactl load-module module-combine-sink \
sink_name=Web_Speech_Sink slaves=$(pacmd list-sinks | grep -A1 "* index" |
grep -oP "<\K[^ >]+") \
sink_properties=device.description="Web_Speech_Stream" \
format=s16le \
channels=1 \
rate=22050

pactl move-sink-input $(pacmd list-sink-inputs|tac|perl
-E'undef$/;$_=<>;/speech-dispatcher-espeak-ng.*?index: (\d+)\n/s;say $1')
Web_Speech_Sink

pactl load-module module-remap-source \ master=Web_Speech_Sink.monitor \
source_name=Web_Speech_Monitor \
source_properties=device.description=Web_Speech_Output

Using this approach I am able to capture output from only
speech-dispatcher-espeak-ng module using

navigator.mediaDevices.getUserMedia({audio: true})
.then(async stream => {
  const [track] = stream.getAudioTracks();
  const devices = await navigator.mediaDevices.enumerateDevices();
  const device = devices.find(({label}) => label === 'Web_Speech_Output');
  track.stop();
  console.log(devices, device);
  return navigator.mediaDevices.getUserMedia({audio: {deviceId: {exact:
device.deviceId}}});
})
.then(stream => {
  const recorder = new MediaRecorder(stream);
  recorder.ondataavailable = e => console.log(URL.createObjectURL(e.data));
  const synth = speechSynthesis;
  const u = new SpeechSynthesisUtterance('test, test, then test again');
  u.onstart = e => {
    recorder.start();
    console.log(e);
  }
  u.onend = e => {
    recorder.stop();
    recorder.stream.getTracks().forEach(track => track.stop());
    console.log(e);
  }
  synth.speak(u);
});

Can the pactl and pacmd code be reduced?

On Tue, Dec 22, 2020 at 2:53 AM Arun Raghavan <arun at arunraghavan.net> wrote:

> On Mon, 21 Dec 2020, at 9:52 AM, guest271314 wrote:
> > A virtual microphone can be created using module-remap-source
> >
> https://aweirdimagination.net/2020/07/19/virtual-microphone-using-gstreamer-and-pulseaudio/
> >
> > pactl load-module module-remap-source \ master=virtmic.monitor
> > source_name=virtmic \
> > source_properties=device.description=Virtual_Microphone
> >
> > AFAICT a sink-input cannot be set as the source for the virtual
> microphone.
> >
> > A sink-input can be recorded using parec or parecord --monitor-stream
> option
> >
> > parecord -v -r --monitor-stream=26 --file-format=wav output.wav
> >
> > How to set a sink-input as source for the virtual microphone so that
> > the output of the sink-input is still played back to speakers or
> > headphones and simultaneously is the source of the virtual microphone?
>
> You could use module-combine-sink to play that sink input to a null-sink
> and the real sink, and then use the null-sink's monitor as your source.
>
> -- Arun
> _______________________________________________
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> pulseaudio-discuss at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
>
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