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Internet live streams

The A2Stream server allows to listen to internet live streams (such as internet radio stations) with A2Stream. This is a step-by-step guide for installing the A2Stream server on a Raspberry Pi:

  • Install Raspberry Pi OS.
  • Open a shell on your Raspberry Pi.
  • Get the A2Stream server source code with 
    wget https://raw.githubusercontent.com/oliverschmidt/a2stream/main/srva2stream.c
  • Compile the A2Stream server source code with 
    gcc -o srva2stream srva2stream.c
  • Check the compilation result with 
    ls -l
  • Install MPlayer with 
    sudo apt install mplayer -y
  • Find out the URL of the actual audio stream of the internet radio station you want to listen to. They tend to not publish their audio stream URL (anymore). For 106.7 Lite FM that URL is http://stream.revma.ihrhls.com/zc1477.
  • Try to play the URL with 
    mplayer http://stream.revma.ihrhls.com/zc1477
  • If MPlayer prints Starting playback... then the URL works. Stop MPlayer witch Ctrl-C.
  • Open a second shell and run the A2Stream server on TCP port 80 with 
    sudo ./srva2stream 80
  • Wait for the the A2Stream server to print waiting on /tmp/a2stream-80.
  • On the first shell, play the URL to the pipe just opened by the A2Stream server with 
    sudo mplayer -nocache -af pan=1:0.5:0.5,volnorm=1:0.8,resample=22200:0:1,format=floatne -ao pcm:nowaveheader:file=/tmp/a2stream-80 http://stream.revma.ihrhls.com/zc1477
  • On the second shell, wait for the A2Stream server to print connect on pipe.
  • On your Apple II, run A2STREAM.SYSTEM and enter the IP address of your Raspberry Pi as URL.
  • If A2Stream plays 106.7 Lite FM, then everything works :-) Stop MPlayer witch Ctrl-C.
  • Now automate everything. First, create a service unit for the A2Stream server with 
    sudo --preserve-env=HOME bash -c 'cat > /etc/systemd/system/a2stream.service << EOF
[Unit]
Description=a2stream
After=network-online.target
Requires=network-online.target

[Service]
ExecStart=$HOME/srva2stream 80

[Install]
WantedBy=multi-user.target
EOF'
  • Enable that service with 
    sudo systemctl enable a2stream.service
  • Create a service unit for MPlayer (depending on the the A2Stream service) with
  • sudo bash -c 'cat > /etc/systemd/system/mplayer.service << EOF
[Unit]
Description=mplayer
After=a2stream.service
Requires=a2stream.service

[Service]
ExecStart=/usr/bin/mplayer -nocache -af pan=1:0.5:0.5,volnorm=1:0.8,resample=22200:0:1,format=floatne -ao pcm:nowaveheader:file=/tmp/a2stream-80 http://stream.revma.ihrhls.com/zc1477

[Install]
WantedBy=multi-user.target
EOF'
  • Enable that service with 
    sudo systemctl enable mplayer.service
  • Start the Mplayer service with 
    sudo systemctl start mplayer.service
  • Check that the A2Stream service was implicitly started (because of the dependency) with 
    systemctl status a2stream.service
  • Check that the two services come up after a reboot with 
    sudo reboot
  • Wait some time to allow the Raspberry Pi to come up.
  • On your Apple II, re-enter the IP address of your Raspberry Pi as URL in A2Stream.
  • If A2Stream plays 106.7 Lite FM, then you're done :-))

Notes:

  1. You can listen to additional internet radio stations by creating additional service pairs. Just use a different port number for each A2Stream service (resulting in a different pipe name to play to for each MPlayer service). On your Apple II, enter <IP address>:<port number> as URL in A2Stream.
  2. You can have custom cover art on your Apple II for each A2Stream service. Just put standard 16kB double hires graphics files named srva2stream-<port number>.dhgr in your home directory.

Further Idea:

With a Raspberry Pi that has both a WiFi and an Ethernet interface, use the former for the internet connection and the latter for a direct short cable connection to your Uthernet II. Run Dnsmasq on the Ethernet interface to provide an IP address to A2Stream. Put the Raspberry Pi right inside your Apple II creating a music art object to place anywhere in your home or office.