- From: guest271314 via GitHub <sysbot+gh@w3.org>
- Date: Sat, 09 May 2020 20:35:38 +0000
- To: public-webrtc-logs@w3.org
This comment attests to system wide audio capture being possible at *indows OS by default https://github.com/w3c/mediacapture-main/issues/694#issuecomment-625266375. *nix has the technical capability to capture system wide audio output, from PulseAudio/Examples - Arch Wiki https://wiki.archlinux.org/index.php/PulseAudio/Examples#ALSA_monitor_source
> **ALSA monitor source**
> To be able to record from a monitor source (a.k.a. "What-U-Hear", "Stereo Mix"), use `pactl list` to find out the name of the source in PulseAudio (e.g. `alsa_output.pci-0000_00_1b.0.analog-stereo.monitor`). Then add lines like the following to `/etc/asound.conf` or `~/.asoundrc`:
>
> ```
> pcm.pulse_monitor {
> type pulse
> device alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
> }
>
> ctl.pulse_monitor {
> type pulse
> device alsa_output.pci-0000_00_1b.0.analog-stereo.monitor
> }
> ```
> Now you can select pulse_monitor as a recording source.
>
> Alternatively, you can use `pavucontrol` to do this: make sure you have set up the display to "All input devices", then select "Monitor of [your sound card]" as the recording source.
however, there is no official algorithm or constraint described demonstrating the canonical procedure to do so.
Firefox 75 and Nightly 78 list `Monitor of <device>` at `getUserMedia()` prompt, Chromium does not.
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Received on Saturday, 9 May 2020 20:35:43 UTC