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music.rb
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music.rb
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#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
require 'dl/import'
module Enumerable
def rest
return [] if empty?
self[1..-1]
end
end
class LiveMIDI
ON = 0x90
OFF = 0x80
PC = 0xC0
attr_reader :interval
@@singleton = nil
def self.use(bpm=120)
return @@singleton = self.new(bpm) if @@singleton.nil?
@@singleton.bpm = bpm
return @@singleton
end
def initialize(bpm=120)
self.bpm = bpm
@timer = Timer.get(@interval/10)
open
end
def bpm=(bpm)
@interval = 60.0 / bpm
end
def play(channel, note, duration, velocity=100, time=nil)
on_time = time || Time.now.to_f
@timer.at(on_time) { note_on(channel, note, velocity) }
off_time = on_time + duration
@timer.at(off_time) { note_off(channel, note, velocity) }
end
def note_on(channel, note, velocity=64)
message(ON | channel, note, velocity)
end
def note_off(channel, note, velocity=64)
message(OFF | channel, note, velocity)
end
def program_change(channel, preset)
message(PC | channel, preset)
end
end
class NoMIDIDestinations < Exception; end
if RUBY_PLATFORM.include?('mswin')
class LiveMIDI
module C
extend DL::Importable
dlload 'winmm'
extern "int midiOutOpen(HMIDIOUT*, int, int, int, int)"
extern "int midiOutClose(int)"
extern "int midiOutShortMsg(int, int)"
end
def open
@device = DL.malloc(DL.sizeof('I'))
C.midiOutOpen(@device, -1, 0, 0, 0)
end
def close
C.midiOutClose(@device.ptr.to_i)
end
def message(one, two=0, three=0)
message = one + (two << 8) + (three << 16)
C.midiOutShortMsg(@device.ptr.to_i, message)
end
end
elsif RUBY_PLATFORM.include?('darwin')
class LiveMIDI
module C
extend DL::Importable
dlload '/System/Library/Frameworks/CoreMIDI.framework/Versions/Current/CoreMIDI'
extern "int MIDIClientCreate(void *, void *, void *, void *)"
extern "int MIDIClientDispose(void *)"
extern "int MIDIGetNumberOfDestinations()"
extern "void * MIDIGetDestination(int)"
extern "int MIDIOutputPortCreate(void *, void *, void *)"
extern "void * MIDIPacketListInit(void *)"
extern "void * MIDIPacketListAdd(void *, int, void *, int, int, int, void *)"
extern "int MIDISend(void *, void *, void *)"
end
module CF
extend DL::Importable
dlload '/System/Library/Frameworks/CoreFoundation.framework/Versions/Current/CoreFoundation'
extern "void * CFStringCreateWithCString (void *, char *, int)"
end
def open
client_name = CF.cFStringCreateWithCString(nil, "RubyMIDI", 0)
@client = DL::PtrData.new(nil)
C.mIDIClientCreate(client_name, nil, nil, @client.ref);
port_name = CF.cFStringCreateWithCString(nil, "Output", 0)
@outport = DL::PtrData.new(nil)
C.mIDIOutputPortCreate(@client, port_name, @outport.ref);
num = C.mIDIGetNumberOfDestinations()
raise NoMIDIDestinations if num < 1
@destination = C.mIDIGetDestination(0)
end
def close
C.mIDIClientDispose(@client)
end
def message(*args)
format = "C" * args.size
bytes = args.pack(format).to_ptr
packet_list = DL.malloc(256)
packet_ptr = C.mIDIPacketListInit(packet_list)
# Pass in two 32 bit 0s for the 64 bit time
packet_ptr = C.mIDIPacketListAdd(packet_list, 256, packet_ptr, 0, 0, args.size, bytes)
C.mIDISend(@outport, @destination, packet_list)
end
end
elsif RUBY_PLATFORM.include?('linux')
class LiveMIDI
module C
extend DL::Importable
dlload 'libasound.so'
extern "int snd_rawmidi_open(void*, void*, char*, int)"
extern "int snd_rawmidi_close(void*)"
extern "int snd_rawmidi_write(void*, void*, int)"
extern "int snd_rawmidi_drain(void*)"
end
def open
@output = DL::PtrData.new(nil)
C.snd_rawmidi_open(nil, @output.ref, "virtual", 0)
end
def close
C.snd_rawmidi_close(@output)
end
def message(*args)
format = "C" * args.size
bytes = args.pack(format).to_ptr
C.snd_rawmidi_write(@output, bytes, args.size)
C.snd_rawmidi_drain(@output)
end
end
else
raise "Couldn't find a LiveMIDI implementation for your platform"
end
class Timer
def self.get(interval)
@timers ||= {}
return @timers[interval] if @timers[interval]
return @timers[interval] = self.new(interval)
end
def initialize(resolution)
@resolution = resolution
@queue = []
Thread.new do
while true
dispatch
sleep(@resolution)
end
end
end
end