LJACK

Lua binding for the JACK Audio Connection Kit.

This binding enables Lua scripting code to registrate ports and to manage port connections and Lua audio processor objects for the JACK Audio Connection Kit. Realtime audio processing of Lua processor objects has to be implemented in native C code.

Further reading:

• Documentation
• Examples

First Example

• This example lists all JACK ports and connects the first MIDI OUT port with the first MIDI IN port if these are available:

  local ljack = require("ljack")
  
  local client = ljack.client_open("example01.lua")
  
  local function listPorts(type, direction)
      local list = client:get_ports(".*", type, direction)
      print("Ports", type, direction)
      for _, p in ipairs(list) do
          print("     ", p)
      end
      print()
      return list
  end
  
  local audioOutList = listPorts("AUDIO", "OUT")
  local audioInList  = listPorts("AUDIO", "IN")
  
  local midiOutList = listPorts("MIDI", "OUT")
  local midiInList  = listPorts("MIDI", "IN")
  
  if #midiInList > 0 and #midiOutList > 0 then
      local p1, p2 = midiOutList[1], midiInList[1]
      print(string.format("Connecting %q\n"..
                          "      with %q...", p1, p2))
      client:connect(p1, p2)
  end