//Create TrackChunk Object from Array of Bytes
public void TrackChunkFromBytes(byte[] TrackBytes)
{
//MidiEvent
int Delta = 0;
sbyte EventType;
sbyte MidiChannel;
byte Param1;
byte Param2;
//TempoEvent
int MicroSecondsPerQuarterNote = 1;
//InstrumentEvent
byte InstrumentNumber = 1;
MidiEvent[] OpenedEvents = new MidiEvent[1];
Boolean DeltaRetrieved = false;
int NextEventIndex = 0;
byte NextByteValue;
for (int ByteIndex = TRACKHEADERLENGTH; ByteIndex < TrackBytes.Length - 1; ByteIndex++)
{
Delta = 0;
while (!(DeltaRetrieved))
{
NextByteValue = TrackBytes[ByteIndex];
if ((NextByteValue) >= 128)
{
Delta = NextByteValue & 127;
Delta = Delta << SHIFT;
}
else
{
Delta = Delta | NextByteValue;
DeltaRetrieved = true;
}
ByteIndex++;
}
DeltaRetrieved = false;
NextByteValue = TrackBytes[ByteIndex];
//If its a Meta Event
if (NextByteValue == 0xff)
{
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
if ((NextByteValue == 0x2F))
{
//EOT found
break;
}
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
ByteIndex++;
MicroSecondsPerQuarterNote = TrackBytes[ByteIndex] << 8;
ByteIndex++;
MicroSecondsPerQuarterNote = (MicroSecondsPerQuarterNote | TrackBytes[ByteIndex]) << 8;
ByteIndex++;
MicroSecondsPerQuarterNote = (MicroSecondsPerQuarterNote | TrackBytes[ByteIndex]);
if (OpenedEvents[0] == null)
{
}
else
{
Array.Resize(ref OpenedEvents, OpenedEvents.Length + 1);
}
OpenedEvents[NextEventIndex] = new TempoMidiEvent(Delta, MicroSecondsPerQuarterNote);
NextEventIndex++;
}
//if its an instrument change event
else if (NextByteValue == 0xC0)
{
MidiChannel = Convert.ToSByte(0x0f & NextByteValue << 4);
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
InstrumentNumber = NextByteValue;
if (OpenedEvents[0] == null)
{
//Do Nothing. Opened events are empty and the first element is free
}
else //Resize the array for the extra event
{
Array.Resize(ref OpenedEvents, OpenedEvents.Length + 1);
}
OpenedEvents[NextEventIndex] = new InstrumentMidiEvent(Delta, 0, MidiChannel, InstrumentNumber);
NextEventIndex++;
}
//Other Midi Event
else
{
EventType = Convert.ToSByte(NextByteValue >> 4);
//No ByteIndex++ because EventType& MidiChannel are stored in same byte
MidiChannel = Convert.ToSByte(NextByteValue & 0xf);
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
Param1 = NextByteValue;
ByteIndex++;
NextByteValue = TrackBytes[ByteIndex];
Param2 = NextByteValue;
if (OpenedEvents[0] == null)
{
}
else
{
Array.Resize(ref OpenedEvents, OpenedEvents.Length + 1);
}
OpenedEvents[NextEventIndex] = new MidiEvent(0, 0, Delta, EventType, MidiChannel, Param1, Param2);
NextEventIndex++;
}
}
CalculateScorePositionFromDeltaTimes(OpenedEvents, MidiHeaderChunk.Ticks);
CalculateNoteDownLengths(OpenedEvents);
MidiTrackChunk = new TrackChunk(OpenedEvents);
}
public StandardMidi()
{
MidiHeaderChunk = new HeaderChunk();
MidiTrackChunk = new TrackChunk();
}