FreeDATA/test/001_highsnr_stdio_audio/README.md

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# 001_HIGHSNR_STDIO_AUDIO TEST SUITE
1. Install
```
sudo apt update
sudo apt upgrade
sudo apt install git cmake build-essential python3-pip portaudio19-dev python3-pyaudio
pip3 install crcengine
pip3 install threading
```
1. Install codec2, and set up the `libcodec2.so` shared library path, for example
```
export LD_LIBRARY_PATH=${HOME}/codec2/build_linux/src
```
## STDIO tests
Pipes are used to move audio samples from the Tx to Rx:
```
python3 test_tx.py --mode datac1 --delay 500 --frames 2 --bursts 1 | python3 test_rx.py --mode datac1 --frames 2 --bursts 1
```
## AUDIO test via virtual audio devices
1. Create virtual audio devices. Note: This command needs to be run again after every reboot
```
sudo modprobe snd-aloop index=1,2 enable=1,1 pcm_substreams=1,1 id=CHAT1,CHAT2
```
1. Check if devices have been created
```
aplay -l
Karte 0: Intel [HDA Intel], Gerät 0: Generic Analog [Generic Analog]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: CHAT1 [Loopback], Gerät 0: Loopback PCM [Loopback PCM]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: CHAT1 [Loopback], Gerät 1: Loopback PCM [Loopback PCM]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 2: CHAT2 [Loopback], Gerät 0: Loopback PCM [Loopback PCM]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 2: CHAT2 [Loopback], Gerät 1: Loopback PCM [Loopback PCM]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
```
1. Determine the audio device number you would like to use:
```
python3 test_rx.py --list
<snip>
audiodev: 0 HDA Intel PCH: ALC269VC Analog (hw:0,0)
audiodev: 1 HDA Intel PCH: HDMI 0 (hw:0,3)
audiodev: 2 HDA Intel PCH: HDMI 1 (hw:0,7)
audiodev: 3 HDA Intel PCH: HDMI 2 (hw:0,8)
audiodev: 4 Loopback: PCM (hw:1,0)
audiodev: 5 Loopback: PCM (hw:1,1)
audiodev: 6 Loopback: PCM (hw:2,0)
audiodev: 7 Loopback: PCM (hw:2,1)
```
In this case we choose audiodev 4 for the RX and 5 for the Tx.
1. Start the Rx first, then Tx in separate consoles:
```
python3 test_rx.py --mode datac0 --frames 2 --bursts 1 --audiodev 4 --debug
python3 test_tx.py --mode datac0 --frames 2 --bursts 1 --audiodev 5