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tlecomte / friture

Real-time audio visualizations (spectrum, spectrogram, etc.)
http://friture.org
GNU General Public License v3.0
916 stars 160 forks source link

WASAPI loopback #64

Open tlecomte opened 6 years ago

tlecomte commented 6 years ago

Audacity is patching PortAudio to get audio loopback: https://github.com/michaelni/audacity/blob/master/lib-src/portaudio-v19/wasapi-loopback.patch https://app.assembla.com/spaces/portaudio/git/source/master/src/hostapi/wasapi/pa_win_wasapi.c

cgernert commented 6 years ago

I also really need this.

I took a look around. In Friture there are some wrappers for PortAudio involved. to be precise: sounddevice -> PyAudio -> PortAudio

There is an inofficial modified PyAudio version that support WASAPI loopbacks. https://github.com/intxcc/pyaudio_portaudio I managed to get the examples working.

But sadly there is no supported sounddevice version for that.

It seems like there would be a lot of rewriting involved in audiobackend.py to make an exception for Windows OS and not use sounddevice, but (the modified) PyAudio library functions.

tlecomte commented 6 years ago

Hello @cgernert ! That's very interesting. Another option that I have in mind is migrating away from sounddevice, and use the audio features from PyQt5 instead. It supports Android, which could be a nice new target for Friture... And it supports wasapi too, so maybe the loopback would work. I've not been able to find any info to confirm that though.

tlecomte commented 6 years ago

I did a quick check and unfortunately PyQt5 does not support WASAPI loopback either.

Another option would be to use https://github.com/bastibe/SoundCard. It does not support WASAPI loopback either, but it may be easier to add support there.

janleskovec commented 6 years ago

Another option would be to use https://github.com/bastibe/SoundCard. It does not support WASAPI loopback either, but it may be easier to add support there.

I actually added support for this and it is already merged. All you have to do is add the include_loopback=True flag when calling all_microphones().

tlecomte commented 6 years ago

Sounds great, thanks @slole ! bastibe/Soundcard does not support callback recording though, right ? Friture would also need this unfortunately...

janleskovec commented 6 years ago

I have already opened an issue about not supporting callback. https://github.com/bastibe/SoundCard/issues/30

s0d3s commented 2 years ago

Hello, I also encountered a problem with recording with the WASAPI loopback devices via python. I did not find a ready-made solution, so I solved this one in my PyAudio fork.

All changes in PyAudio behavior are minor. The main thing is that the methodology for working with loopback devices has been worked out. It might help you solve your issues.