protected byte[] GetMidiMessage(MIDITrack track)
{
byte command = Common.GetByte(ref ByteBuff, ref currentOffset);
byte[] data;
if (!((command & 0x80) == 0x80)) // is not command?
{
if (track.LastCommand == 0)
{
throw new System.Exception("Bad midi file");
}
command = track.LastCommand;
currentOffset--; // Command byte - its 1 first data dyte
}
else
{
track.LastCommand = command;
}
data = GetMessageDataForCommand(track);
byte[] result = new byte[data.Length + 1];
result[0] = command;
Array.Copy(data, 0, result, 1, data.Length);
return(result);
}
protected MIDIEvent LoadMidiEvent(MIDITrack track)
{
MIDIEvent result = new MIDIEvent();
result.absTime = Common.GetVariableNumber(ref ByteBuff, ref currentOffset);
result.MidiMessage = GetMidiMessage(track);
return(result);
}
protected void ProcessMIDITracks()
{
for (int i = 0; i < MidiHeaderInfo.TrackCount; i++)
{
MIDITrack track = new MIDITrack();
ProcessMIDITrack(track);
Tracks.Add(track);
}
}
protected void ProcessMidiEvents(MIDITrack track)
{
track.MidiEvents = new List <MIDIEvent>();
int _old;
while (track.Info.Length > 0)
{
_old = currentOffset;
MIDIEvent midiEvent = LoadMidiEvent(track);
track.AbsTime += midiEvent.absTime;
midiEvent.absTime = track.AbsTime;
track.MidiEvents.Add(midiEvent);
track.Info.Length -= (currentOffset - _old);
}
}
protected void ProcessMIDITrack(MIDITrack track)
{
ProcessMidiTrackInfo(ref track.Info);
track.AbsTime = 0;
track.LastCommand = 0;
track.CurrentEventIndex = 0;
MIDIMarker marker = new MIDIMarker();
marker.StartIndex = track.MidiEvents.Count();
marker.Name = "Init";
marker.Section = StyleSections.Init;
track.CurrentMarker = marker;
track.MidiMarkers.Add(marker);
ProcessMidiEvents(track);
if (track.CurrentMarker != null)
{
track.CurrentMarker.StopIndex = track.MidiEvents.Count() - 1;
}
}
protected byte[] GetMessageDataForCommand(MIDITrack track)
{
//Meta
if (track.LastCommand == 0xFF)
{
byte type = Common.GetByte(ref ByteBuff, ref currentOffset);
byte[] b = GetVarData();
byte[] result = new byte[b.Length + 1];
result[0] = type;
Array.Copy(b, 0, result, 1, b.Length);
if (type == 0x06)
{
if (track.CurrentMarker != null)
{
track.CurrentMarker.StopIndex = track.MidiEvents.Count() - 1;
}
string name = Encoding.Default.GetString(b);
if (name != "SFF1" && name != "SInt")
{
MIDIMarker marker = new MIDIMarker();
marker.StartIndex = track.MidiEvents.Count();
marker.Name = name;
track.CurrentMarker = marker;
track.MidiMarkers.Add(marker);
}
}
if (type == 0x03)
{
StyleName = Encoding.Default.GetString(b);
}
return(result);
}
else
//SysEx
if (track.LastCommand == 0xF0)
{
return(GetVarData());
}
else
if (track.LastCommand == 0xF7)
{
throw new NotImplementedException();
}
else
// Channel message
if (Common.IsMasked(track.LastCommand, 0x8) || Common.IsMasked(track.LastCommand, 0x9) || Common.IsMasked(track.LastCommand, 0xA) || Common.IsMasked(track.LastCommand, 0xB) || Common.IsMasked(track.LastCommand, 0xE))
{
return(new byte[2] {
Common.GetByte(ref ByteBuff, ref currentOffset), Common.GetByte(ref ByteBuff, ref currentOffset)
});
}
else
if (Common.IsMasked(track.LastCommand, 0xC) || Common.IsMasked(track.LastCommand, 0xD))
{
return(new byte[1] {
Common.GetByte(ref ByteBuff, ref currentOffset)
});
}
return(new byte[0]);
}
