public static void decode_to_int()
{
Assert.Equal(0, VariableLengthUtil.decode_to_int(new ByteList()
{
0x00
}));
Assert.Equal(0x40, VariableLengthUtil.decode_to_int(new ByteList()
{
0x40
}));
Assert.Equal(0x7F, VariableLengthUtil.decode_to_int(new ByteList()
{
0x7F
}));
Assert.Equal(0x80, VariableLengthUtil.decode_to_int(new ByteList()
{
0x81, 0x00
}));
Assert.Equal(0x2000, VariableLengthUtil.decode_to_int(new ByteList()
{
0xC0, 0x00
}));
Assert.Equal(0x3FFF, VariableLengthUtil.decode_to_int(new ByteList()
{
0xFF, 0x7F
}));
Assert.Equal(0x1FFFFF, VariableLengthUtil.decode_to_int(new ByteList()
{
0xFF, 0xFF, 0x7F
}));
Assert.Equal(0x08000000, VariableLengthUtil.decode_to_int(new ByteList()
{
0xC0, 0x80, 0x80, 0x00
}));
Assert.Equal(0x0FFFFFFF, VariableLengthUtil.decode_to_int(new ByteList()
{
0xFF, 0xFF, 0xFF, 0x7F
}));
}
public static void decode()
{
Assert.Equal(new ByteList()
{
0x00
}, VariableLengthUtil.decode(new ByteList()
{
0x00
}));
Assert.Equal(new ByteList()
{
0x40
}, VariableLengthUtil.decode(new ByteList()
{
0x40
}));
Assert.Equal(new ByteList()
{
0x7F
}, VariableLengthUtil.decode(new ByteList()
{
0x7F
}));
Assert.Equal(new ByteList()
{
0x80
}, VariableLengthUtil.decode(new ByteList()
{
0x81, 0x00
}));
Assert.Equal(new ByteList()
{
0x20, 0x00
}, VariableLengthUtil.decode(new ByteList()
{
0xC0, 0x00
}));
Assert.Equal(new ByteList()
{
0x3F, 0xFF
}, VariableLengthUtil.decode(new ByteList()
{
0xFF, 0x7F
}));
Assert.Equal(new ByteList()
{
0x1F, 0xFF, 0xFF
}, VariableLengthUtil.decode(new ByteList()
{
0xFF, 0xFF, 0x7F
}));
Assert.Equal(new ByteList()
{
0x08, 0x00, 0x00, 0x00
}, VariableLengthUtil.decode(new ByteList()
{
0xC0, 0x80, 0x80, 0x00
}));
Assert.Equal(new ByteList()
{
0x0F, 0xFF, 0xFF, 0xFF
}, VariableLengthUtil.decode(new ByteList()
{
0xFF, 0xFF, 0xFF, 0x7F
}));
}
private static MIDIEvent_Length_Tuple next_event(ByteEnumerable track_data, int start_index, byte last_midi_channel)
{
var i = start_index - 1;
MidiEvent midi_event = null;
{
var delta_time = 0;
{
var length_temp = new ByteList();
do
{
i += 1;
length_temp.Add(track_data.ElementAt(i));
} while (track_data.ElementAt(i) > 0x7F);
delta_time = VariableLengthUtil.decode_to_int(length_temp);
}
i += 1;
var event_type_value = track_data.ElementAt(i);
// MIDI Channel Events
if ((event_type_value & 0xF0) < 0xF0)
{
var midi_channel_event_type = (byte)(event_type_value & 0xF0);
var midi_channel = (byte)(event_type_value & 0x0F);
i += 1;
var parameter_1 = track_data.ElementAt(i);
var parameter_2 = (byte)0x00;
// One or two parameter type
switch (midi_channel_event_type)
{
// One parameter types
case 0xC0:
midi_event = new ProgramChangeEvent(delta_time, midi_channel, parameter_1);
last_midi_channel = midi_channel;
break;
case 0xD0:
midi_event = new ChannelAftertouchEvent(delta_time, midi_channel, parameter_1);
last_midi_channel = midi_channel;
break;
// Two parameter types
case 0x80:
i += 1;
parameter_2 = track_data.ElementAt(i);
midi_event = new NoteOffEvent(delta_time, midi_channel, parameter_1, parameter_2);
last_midi_channel = midi_channel;
break;
case 0x90:
i += 1;
parameter_2 = track_data.ElementAt(i);
midi_event = new NoteOnEvent(delta_time, midi_channel, parameter_1, parameter_2);
last_midi_channel = midi_channel;
break;
case 0xA0:
i += 1;
parameter_2 = track_data.ElementAt(i);
midi_event = new NoteAftertouchEvent(delta_time, midi_channel, parameter_1, parameter_2);
last_midi_channel = midi_channel;
break;
case 0xB0:
i += 1;
parameter_2 = track_data.ElementAt(i);
midi_event = new ControllerEvent(delta_time, midi_channel, parameter_1, parameter_2);
last_midi_channel = midi_channel;
break;
case 0xE0:
i += 1;
parameter_2 = track_data.ElementAt(i);
midi_event = new PitchBendEvent(delta_time, midi_channel, parameter_1, parameter_2);
last_midi_channel = midi_channel;
break;
// Might be a Control Change Messages LSB
default:
midi_event = new ControllerEvent(delta_time, last_midi_channel, event_type_value, parameter_1);
break;
}
i += 1;
}
// Meta Events
else if (event_type_value == 0xFF)
{
i += 1;
var meta_event_type = track_data.ElementAt(i);
i += 1;
var meta_event_length = track_data.ElementAt(i);
i += 1;
var meta_event_data = Enumerable.Range(i, meta_event_length).Select(b => track_data.ElementAt(b)).ToArray();
switch (meta_event_type)
{
case 0x00:
midi_event = new SequenceNumberEvent(BitConverter.ToUInt16(meta_event_data.Reverse().ToArray <byte>(), 0));
break;
case 0x01:
midi_event = new TextEvent(delta_time, stringEncoder.GetString(meta_event_data));
break;
case 0x02:
midi_event = new CopyrightNoticeEvent(stringEncoder.GetString(meta_event_data));
break;
case 0x03:
midi_event = new SequenceOrTrackNameEvent(stringEncoder.GetString(meta_event_data));
break;
case 0x04:
midi_event = new InstrumentNameEvent(delta_time, stringEncoder.GetString(meta_event_data));
break;
case 0x05:
midi_event = new LyricsEvent(delta_time, stringEncoder.GetString(meta_event_data));
break;
case 0x06:
midi_event = new MarkerEvent(delta_time, stringEncoder.GetString(meta_event_data));
break;
case 0x07:
midi_event = new CuePointEvent(delta_time, stringEncoder.GetString(meta_event_data));
break;
case 0x20:
midi_event = new MIDIChannelPrefixEvent(delta_time, meta_event_data[0]);
break;
case 0x2F:
midi_event = new EndOfTrackEvent(delta_time);
break;
case 0x51:
var tempo =
(meta_event_data[2] & 0x0F) +
((meta_event_data[2] & 0xF0) * 16) +
((meta_event_data[1] & 0x0F) * 256) +
((meta_event_data[1] & 0xF0) * 4096) +
((meta_event_data[0] & 0x0F) * 65536) +
((meta_event_data[0] & 0xF0) * 1048576);
midi_event = new SetTempoEvent(delta_time, tempo);
break;
case 0x54:
midi_event = new SMPTEOffsetEvent(delta_time, meta_event_data[0], meta_event_data[1], meta_event_data[2], meta_event_data[3], meta_event_data[4]);
break;
case 0x58:
midi_event = new TimeSignatureEvent(delta_time, meta_event_data[0], meta_event_data[1], meta_event_data[2], meta_event_data[3]);
break;
case 0x59:
midi_event = new KeySignatureEvent(delta_time, meta_event_data[0], meta_event_data[1]);
break;
case 0x7F:
midi_event = new SequencerSpecificEvent(delta_time, meta_event_data);
break;
}
i += meta_event_length;
}
// System Exclusive Events
else if (event_type_value == 0xF0 || event_type_value == 0xF7)
{
var event_length = 0;
{
var length_temp = new ByteList();
do
{
i += 1;
length_temp.Add(track_data.ElementAt(i));
} while (track_data.ElementAt(i) > 0x7F);
event_length = VariableLengthUtil.decode_to_int(length_temp);
}
i += 1;
var event_data = Enumerable.Range(i, event_length).Select(b => track_data.ElementAt(b));
midi_event = new SysexEvent(delta_time, event_type_value, event_data);
i += event_length;
}
}
switch (midi_event != null)
{
case true:
return(new MIDIEvent_Length_Tuple(new SomeMidiEvent(midi_event), i - start_index, last_midi_channel));
}
return(new MIDIEvent_Length_Tuple(new NoMidiEvent(), i - start_index, last_midi_channel));
}
