static MidiTrack ReadTrack(MidiDataStreamReader reader)
{
var track = new MidiTrack ();
// Chunk type.
if (new string (reader.ReadChars (4)) != "MTrk") {
throw new System.FormatException ("Can't find track chunk.");
}
// Chunk length.
var chunkEnd = reader.ReadBEInt32 ();
chunkEnd += reader.Offset;
// Read delta-time and event pairs.
byte ev = 0;
while (reader.Offset < chunkEnd) {
// Delta time.
var delta = reader.ReadMultiByteValue ();
// Event type.
if ((reader.PeekByte () & 0x80) != 0) {
ev = reader.ReadByte ();
}
if (ev == 0xff) {
// 0xff: Meta event (unused).
reader.Advance (1);
reader.Advance (reader.ReadMultiByteValue ());
} else if (ev == 0xf0) {
// 0xf0: SysEx (unused).
while (reader.ReadByte() != 0xf7) {
}
} else {
// MIDI event
byte data1 = reader.ReadByte ();
byte data2 = ((ev & 0xe0) == 0xc0) ? (byte)0 : reader.ReadByte ();
track.AddEvent (delta, new MidiEvent (ev, data1, data2));
}
}
return track;
}
// Constructor
// "ppqn" stands for Pulse Per Quater Note,
// which is usually provided with a MIDI header.
public MidiTrackSequencer(MidiTrack track, int ppqn, float bpm)
{
pulsePerSecond = bpm / 60.0f * ppqn;
enumerator = track.GetEnumerator();
}
public MidiTrackSequencer(MidiTrack track, int ppqn, float bpm)
{
pulsePerSecond = bpm / 60.0f * ppqn;
enumerator = track.GetEnumerator ();
}
// Constructor
// "ppqn" stands for Pulse Per Quater Note,
// which is usually provided with a MIDI header.
public MidiTrackSequencer(MidiTrack track, int ppqn, float bpm)
{
_track = track;
_pulsePerSecond = bpm / 60.0f * ppqn;
}
