public MidiMessage copy()
{
MidiMessage other = (MidiMessage)this.MemberwiseClone();
return(other);
}
protected int readTrack(int p_readPos)
{
int currentTrack = midiTracks.Count;
byte[] trackSizeRaw = new byte[4];
for (int i = 0; i < 4; i++)
{
trackSizeRaw[i] = readFile[p_readPos];
p_readPos++;
}
if (BitConverter.IsLittleEndian)
{
Array.Reverse(trackSizeRaw);
}
trackPosOffset += 8; //offset for track header- timestamp and mtrk
int trackSize = BitConverter.ToUInt16(trackSizeRaw, 0); //this is track size not including header or ender...
MidiTrack track = new MidiTrack();
byte runningStatus = 0x00;
bool canUseRunningStatus = false;
//add all notes here. 4 is num bytes in track end message.
while (p_readPos < (trackSize + trackPosOffset))
{
while (p_readPos + 2 < (trackSize + trackPosOffset))
{
if (readFile[p_readPos] == 0x00 && readFile[p_readPos + 1] == 0xff)
{
p_readPos += 2;
switch (readFile[p_readPos])
{
case 0x00:
p_readPos += 2;
//00 FF 00 02 seqNum
//sequenceNum
break;
case 0x01:
//textEvent
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x02:
//copyrightMes
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x03:
//trackName
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x04:
//instName
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x05:
//lyrics
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x06:
//textMarker
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x07:
//cuePoint
p_readPos++;
p_readPos += (ushort)(readFile[p_readPos]); //len byte and text length
break;
case 0x20:
//midiChannelPrefix
p_readPos += 2;
break;
case 0x2f:
//endOfTrack
p_readPos++;
break;
case 0x51:
//setTempo
p_readPos += 4;
break;
case 0x54:
//SMPTEOffset
p_readPos += 6;
break;
case 0x58:
//timeSignature
p_readPos += 5;
break;
case 0x59:
//keySignature
p_readPos += 3;
break;
}
p_readPos++; //move to next read pos
}
else
{
break;
}
}
if (p_readPos < (trackSize + trackPosOffset))
{
List <byte> rawMessage = new List <byte>();
int numBytesTimestamp = 1;
//check for large timestamps
while (readFile[p_readPos] > 0x7F)
{
rawMessage.Add(readFile[p_readPos++]);
numBytesTimestamp++;
}
rawMessage.Add(readFile[p_readPos++]); //time stamp size will always be >= 1
//check if status byte or ctl byte is ignored
if ((readFile[p_readPos] & 0xF0) >= 0x80 && (readFile[p_readPos] & 0xF0) <= 0xE0)
{
canUseRunningStatus = true;
runningStatus = readFile[p_readPos]; //store status for later
rawMessage.Add(readFile[p_readPos++]); // add status byte- event type and channel
rawMessage.Add(readFile[p_readPos++]); // add note byte
rawMessage.Add(readFile[p_readPos++]); //add velocity byte
}
else if ((readFile[p_readPos] & 0xF0) == 0xF0)
{
canUseRunningStatus = false;
rawMessage.Add(readFile[p_readPos++]); // add status byte
rawMessage.Add(0x00); // add ctl byte- 0 as it's not used
rawMessage.Add(readFile[p_readPos++]); //add velocity byte
}
else if ((readFile[p_readPos] & 0xF0) <= 0x70 && canUseRunningStatus)
{
rawMessage.Add(runningStatus); // add running status message
rawMessage.Add(readFile[p_readPos++]); // add note byte
rawMessage.Add(readFile[p_readPos++]); //add velocity byte
}
MidiMessage mes = new MidiMessage(rawMessage.ToArray(), numBytesTimestamp);
mes.setOwnerTrack(track);
track.AddNote(mes);
}
}
track.setTrackNum(midiTracks.Count); //0 referenced
addTrack(track);
trackPosOffset += trackSize;
return(p_readPos);
}
