Hi I’m using the C++ audio example lib and came across a little trick I thought I would share.
I am in a situation where talking to the alsa device directly is not possible.
Another device has a lock on the sound card.
Even though the code says
Requires one parameter (ID of the sound card) in the form of plughw:1,0 (where 1=card number, 0=device).
You can find these via
cat /proc/asound/cards. E.g. for:
0 [Headphones ]: bcm2835_headphonbcm2835 Headphones - bcm2835 Headphones
1 [Webcam ]: USB-Audio - C922 Pro Stream Webcam
C922 Pro Stream Webcam at usb-0000:01:00.0-1.3, high speed
The ID for ‘C922 Pro Stream Webcam’ is then plughw:1,0
if you have pulse running and the alsa pulse plugin
You can use the aliases ie:
Playback/recording through the PulseAudio sound server
you can just run your code with
and it will listen via the pulse pipe and works fine.
‘default’ works so any other working input should also work the same way