DarkIce, Icecast, Streaming computer audio over WiFi

The following creates a local WiFi 'radio station' to rebroadcast to an internet radio receiver whatever the soundcard in a Ubuntu PC is playing, specifically on the ALSA devices 'monitor' output.

1. Use the following command to list out Alsa output sources.
   $ pactl list | grep alsa_output
   
   Mine looks like this. I have a HiFImeDIY audio DAC and a HDMI connected television.
   

   Name: alsa_output.pci-0000_01_00.1.hdmi-surround71-extra1
   Monitor Source: alsa_output.pci-0000_01_00.1.hdmi-surround71-extra1.monitor
   Name: alsa_output.usb-HiFimeDIY_Audio_HiFimeDIY_DAC-01.iec958-stereo
   Monitor Source: alsa_output.usb-HiFimeDIY_Audio_HiFimeDIY_DAC-01.iec958-stereo.monitor
   Name: alsa_output.pci-0000_01_00.1.hdmi-surround71-extra1.monitor
   Monitor of Sink: alsa_output.pci-0000_01_00.1.hdmi-surround71-extra1
   Name: alsa_output.usb-HiFimeDIY_Audio_HiFimeDIY_DAC-01.iec958-stereo.monitor
   Monitor of Sink: alsa_output.usb-HiFimeDIY_Audio_HiFimeDIY_DAC-01.iec958-stereo
   

   If you don't see a Monitor output, find another soundcard for your PC?
2. Identify the line for the 'Monitor Source' for the 'Name' output that you normally play PC audio out to.

3. Install DarkIce from http://www.darkice.org/
4. Install and configure Icecast (http://icecast.org) securely from documentation
   $ sudo apt-get install icecast
5. Create (and edit) the following as /etc/darkice.cfg

[general]
       duration        = 3600
       bufferSecs      = 5

       [input]
       device          = pulseaudio # hw:2,1
       paSourceName    = alsa_output.usb-HiFimeDIY_Audio_HiFimeDIY_DAC-01.iec958-stereo.monitor
       sampleRate      = 44100 
       bitsPerSample   = 16
       channel         = 2

       [icecast2-0]
       format = mp3 
       sampleRate      = 44100 
       channel         = 2
       bitrateMode     = cbr
       bitrate         = 192 
       server          = serverme.lan
       port            = 8000
       password = youricecastserverpasswordhere 
       mountPoint      = live96
       name            = tictac2 
       description     = Streaming from TicTac2 
       url             = http://www.yourserver.com
       genre           = live
       public          = yes
       remoteDumpFile  = /tmp/live96.mp3

6. Start DarkIce with the following command, and 'tune in' from your internet radio. When finished listening stop the darkice process with Ctrl-C.
   $ sudo /usr/bin/darkice
   
   

   DarkIce 1.2 live audio streamer, http://code.google.com/p/darkice/
   Copyright (c) 2000-2007, Tyrell Hungary, http://tyrell.hu/
   Copyright (c) 2008-2013, Akos Maroy and Rafael Diniz
   This is free software, and you are welcome to redistribute it 
   under the terms of The GNU General Public License version 3 or
   any later version.
   
   Using config file: /etc/darkice.cfg
   Using PulseAudio audio server as input device.
   Using PulseAudio source:  alsa_output.usb-HiFimeDIY_Audio_HiFimeDIY_DAC-01.iec958-stereo.monitor
   Using POSIX real-time scheduling, priority 4
   

7. If you see the following panic message after this, check that the 'paSourceName' is entered correctly and your normal soundcard is actually selected as output in your PC's soundmixer.
   

   No such entity [0]
   Assertion 's' failed at pulse/simple.c:253, function pa_simple_free(). Aborting.
   Aborted (core dumped)