# Instructions

1. Install:
   ```
   cd FreeDATA
   mkdir build
   cd build
   cmake -DCODEC2_BUILD_DIR=$HOME/codec2/build_linux ..
   ```
2. List available tests:
   ```
   ctest -N
   Test project /home/david/FreeDATA/build
   Test #1: 000_audio_tests
   Test #2: 001_highsnr_stdio_audio

   Total Tests: 2
   ```
3. Run tests:
   ```
   ctest --output-on-failure
   ```
4. Run tests verbosely:
   ```
   ctest -V
   ```




# 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
### Important:
The virtual audio devices are great for testing, but they are also a little bit tricky to handle. So there's a high chance, the tests will fail, if you are running them via virtual audio devices. You should run the tests several times, while keeping this in mind. Most time the ctest is working even if it is failing.

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