Class: AlsaRawMIDI::Soundcard

Inherits:
Object
  • Object
show all
Defined in:
lib/alsa-rawmidi/soundcard.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(card_num) ⇒ Soundcard

Returns a new instance of Soundcard.



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# File 'lib/alsa-rawmidi/soundcard.rb', line 9

def initialize(card_num)
  @subdevices = { :input => [], :output => [] }
  name = "hw:#{card_num}"
  handle_ptr = FFI::MemoryPointer.new(FFI.type_size(:int))
  #snd_ctl = Map::SndCtl.new
  #snd_ctl_pointer = FFI::MemoryPointer.new(:pointer).write_pointer(snd_ctl.pointer)
  Map.snd_ctl_open(handle_ptr, name, 0)
  handle = handle_ptr.read_int
  32.times do |i|
    devnum = FFI::MemoryPointer.new(:int).write_int(i)
    if (err = Map.snd_ctl_rawmidi_next_device(handle, devnum)) < 0
    break # fix this
    end
    @subdevices.keys.each do |type|
      populate_subdevices(type, handle, card_num, i)
    end
  end
end

Instance Attribute Details

#subdevices ⇒ Object (readonly)

Returns the value of attribute subdevices.



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# File 'lib/alsa-rawmidi/soundcard.rb', line 7

def subdevices
  @subdevices
end

Class Method Details

.find(card_num) ⇒ Object 



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# File 'lib/alsa-rawmidi/soundcard.rb', line 28

def self.find(card_num)
  Soundcard.new(card_num) if Map.snd_card_load(card_num).eql?(1)
end