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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
  2. 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

  2. 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

  3. 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.

  4. 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