Module: AlsaRawMIDI::API::Device

Defined in:
lib/alsa-rawmidi/api.rb

Overview

Wrapper for ALSA methods dealing with devices

Class Method Summary collapse

Class Method Details

.close(handle) ⇒ Boolean

Close the device with the given handle

Parameters:

  • handle (Integer)

Returns:

  • (Boolean) 


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# File 'lib/alsa-rawmidi/api.rb', line 318

def close(handle)
  API.snd_rawmidi_drain(handle)
  API.snd_rawmidi_close(handle)
  true
end

.get_info(id, direction) ⇒ SndCtlCardInfo

Parameters:

  • id (Integer)
  • direction (Symbol)

Returns:



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# File 'lib/alsa-rawmidi/api.rb', line 303

def get_info(id, direction)
  stream_key = case direction
               when :input then :SND_RAWMIDI_STREAM_INPUT
               when :output then :SND_RAWMIDI_STREAM_OUTPUT
               end
  stream = API::CONSTANTS[stream_key]
  info = API::SndRawMIDIInfo.new
  API.snd_rawmidi_info_set_device(info.pointer, id)
  API.snd_rawmidi_info_set_stream(info.pointer, stream)
  info
end

.open(_id) {|handle_pointer| ... } ⇒ Integer

Open the device with the given id

Parameters:

  • id (Integer)
  • block (Proc)

Yields:

  • (handle_pointer)

Returns:

  • (Integer) 


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# File 'lib/alsa-rawmidi/api.rb', line 328

def open(_id)
  handle_pointer = FFI::MemoryPointer.new(FFI.type_size(:int))
  yield(handle_pointer)
  handle_pointer.read_int
end