/// <summary>
/// Initializes a new instance of the MidiEventArgs class with the
/// specified Midi event.
/// </summary>
/// <param name="e">
/// The Midi event for this event.
/// </param>
public MidiEventArgs(MidiEvent e)
{
evt = e;
}
/// <summary>
/// Reads the data for the next track from the Midi file.
/// </summary>
/// <param name="trackNum">
/// The track number.
/// </param>
private void ReadNextTrack(int trackNum)
{
int status = 0;
int runningStatus = 0;
// Read length of track.
binReader.ReadBytes(LengthByteCount);
// Continue reading Midi events until the end of the track.
while (true)
{
// Next Midi message in track.
IMidiMessage msg = null;
// Ticks for next Midi event.
int ticks = ReadVariableLengthQuantity();
// Read status byte for the next Midi message.
status = binReader.ReadByte();
// If this is a status byte.
if ((status & StatusFlag) == StatusFlag)
{
// If the next Midi message is a channel message.
if (ChannelMessage.IsChannelMessage(status))
{
// Read channel message from the Midi file.
msg = ReadChannelMessage(status);
// Update running status.
runningStatus = status;
}
// Else if the next Midi message is a meta message.
else if (MetaMessage.IsMetaMessage(status))
{
// Read the type of meta message.
MetaType mType = (MetaType)binReader.ReadByte();
// If this is the end of the track.
if (mType == MetaType.EndOfTrack)
{
// Make sure end of track message has the same
// ticks value as the end of track message in the
// file.
tracks[trackNum].Slide(tracks[trackNum].Count - 1, ticks);
// Break out of loop - finished with this track.
break;
}
// Read the length of the meta message data.
int length = ReadVariableLengthQuantity();
// Read the meta message data.
byte[] data = binReader.ReadBytes(length);
// Create meta message.
msg = new MetaMessage(mType, data);
}
// Else if the next Midi message is a system exclusive
// message.
else if (SysExMessage.IsSysExMessage(status))
{
// The type of system exclusive message.
SysExType type = (SysExType)status;
// Read the length of the system exclusive data.
int length = ReadVariableLengthQuantity();
// Read the system exclusive data.
byte[] data = binReader.ReadBytes(length);
// Create system exclusive message.
msg = new SysExMessage(type, data);
}
}
// Assumes running status.
else
{
// Create channel message.
msg = ReadChannelMessage(runningStatus, status);
}
// Create the next Midi event and store it in the specified
// track.
MidiEvent e = new MidiEvent(msg, ticks);
tracks[trackNum].Add(e);
}
}
/// <summary>
///
/// </summary>
/// <param name="tracks"></param>
/// <returns></returns>
public static Track Merge(ArrayList tracks)
{
Track mergedTrack = new Track();
Track currentTrack;
ArrayList trackList = new ArrayList();
ArrayList events = new ArrayList();
ArrayList trackIndexes = new ArrayList();
for (int i = 0; i < tracks.Count; i++)
{
currentTrack = (Track)tracks[i];
if (currentTrack.Count > 1)
{
trackList.Add(currentTrack);
trackIndexes.Add(0);
events.Add(currentTrack[0]);
}
}
while (events.Count > 0)
{
int n = 0;
MidiEvent e1 = (MidiEvent)events[0];
MidiEvent e2;
int ticks = e1.Ticks;
for (int i = 1; i < events.Count; i++)
{
e1 = (MidiEvent)events[i];
if (e1.Ticks < ticks)
{
ticks = e1.Ticks;
n = i;
}
}
e1 = (MidiEvent)events[n];
mergedTrack.Add(e1);
for (int i = 0; i < events.Count; i++)
{
e2 = (MidiEvent)events[i];
e2.Ticks -= e1.Ticks;
events[i] = e2;
}
int counter = (int)trackIndexes[n] + 1;
currentTrack = (Track)trackList[n];
if (counter < currentTrack.Count - 1)
{
events[n] = currentTrack[counter];
trackIndexes[n] = counter;
}
else
{
trackList.RemoveAt(n);
trackIndexes.RemoveAt(n);
events.RemoveAt(n);
}
}
return(mergedTrack);
}
