iDAC

i(Pad)?OS Devices as a DAC.

Setup with PulseAudio

with iDAC, you can use an iOS device as PulseAudio audio input/output.

1. Install inetcat command (in Arch Linux, package name is libusbmuxd)
2. Create null sink that provide sounds to iDAC. (if you want to hear already exists output monitor device in iDAC, please skip this step)
   • pactl load-module module-null-sink sink_name=iDAC_Output sink_properties=device.description=iDAC_Output format=float32le channels=2 rate=48000
   • If successful, pactl shows number
3. Create null sink that outputs microphone sounds from iDAC.
   • pactl load-module module-null-sink sink_name=iDAC_Input sink_properties=device.description=iDAC_Input format=float32le channels=1 rate=48000
   • If successful, pactl shows number
4. Launch iDAC App
5. Run command
   • parec --rate=48000 --format=float32le --channels=2 --device=iDAC_Output.monitor --latency-msec=1 | inetcat 48000 | pacat --rate=48000 --format=float32le --channels=1 --latency-msec=10 --device=iDAC_Input
   • If connected two or more devices to your computer, you may need to specify device UUID that running iDAC in inetcat options. please check inetcat help.
6. Set output device to iDAC_Output and input device to Monitor of iDAC_Input or iDAC_Input.monitor.

Known Issues with PulseAudio

• sometimes usbmuxd using 100% CPU
  • workaround: disconnect & connect a USB cable, then sudo killall usbmuxd
• some Linux applications (e.g. Discord) doesn't show iDAC_Input device and other monitor devices
  • workaround: Use PulseAudio's module-remap-source.
  • Run pactl load-module module-remap-source master=iDAC_Input.monitor source_name="iDAC_Input_Remapped" and use Remapped Monitor of iDAC_Input as input device.