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added a few commands to help with sound setup

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Paul Dino Jones 2025-01-17 10:28:25 -05:00
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README.md
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@ -73,11 +73,19 @@ cmake -DUSE_PULSEAUDIO=YES ..
```
## Bass Shaker Sound Devices
When using pulseaudio it is necesarry to provide a devid in the configuration. You can find this with: (you need to look at the full output of pactl if you don't know which one you want)
When using pulseaudio it is necesarry to provide a devid in the configuration. This command should list available sound cards with the "Name" being the "devid" needed in the monocoque config.
```
pactl list sinks|grep -E -i 'index:|name:'
pactl list sinks | grep -E -i 'index:|name:' -A 4
```
analyze the output to determine the appropriate hardware to which you would like to output the effects. ( Need to research how to do this with pipewire. )
One can generate sample sine waves at specific frequency on a specific channel on a specific sound card with this command
```
ffmpeg -f lavfi -i "sine=f=440" -af "pan=7.1|c1=c0,surround=level_out=10" -f wav pipe:1 | paplay --no-remap --no-remix -d alsa_output.pci-0000_00_1b.0.analog-stereo -n "Monocoque" --stream-name="Haptic Test"
```
(the -n and --stream-name are optional but it helps you identify the stream in pavucontrol)
The channel map from the pactl command is the order of channels. Change c1 in this above command to the desired output channel.
The effects generated by monocoque should match the effects generated by this ffmpeg command. The frequency will differ slightly due to having to [fit in the buffer size](https://stackoverflow.com/questions/40078417/how-to-calculate-minimum-cycles-of-sine-wave-to-have-integer-n-cycles-in-a-buffe)
(monocoque lowers the target frequency until it fits in the audio buffer).
## Using Arduino Devices