Class: Portmidi::Input

Inherits:
Object
  • Object
show all
Defined in:
lib/portmidi/input.rb

Instance Method Summary collapse

Constructor Details

#initialize(device_id, buffer_size = 512) ⇒ Input

Returns a new instance of Input.



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# File 'lib/portmidi/input.rb', line 3

def initialize(device_id, buffer_size = 512)
  in_stream_ptr = FFI::MemoryPointer.new(:pointer)
  if (errnum = PM_Map.Pm_OpenInput(in_stream_ptr, device_id, nil, buffer_size, nil, nil)) == 0
    @in_stream = in_stream_ptr.read_pointer
  else
    raise "Could not open Device #{device_id} as output device"
  end
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/portmidi/input.rb', line 12

def close
  PM_Map.Pm_Close(@in_stream)
end

#poll ⇒ Object 



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# File 'lib/portmidi/input.rb', line 16

def poll
  PM_Map.Pm_Poll(@in_stream) != 0
end

#read(buffer_size = 1) ⇒ Object 



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# File 'lib/portmidi/input.rb', line 20

def read(buffer_size = 1)
  event_pointer = FFI::MemoryPointer.new(PM_Map::Event, buffer_size)
  read = PM_Map::Pm_Read(@in_stream, event_pointer, buffer_size);
  if read > 0
    events = []
    read.times do |i|
      events << parseEvent(PM_Map::Event.new(event_pointer[i]))
    end
    return events
  elsif read < 0
    raise DeviceError, read, "read failed"
  else
    return nil
  end
end