/// <summary>
/// Initializes a new instance of the Track class with another instance
/// of the Track class.
/// </summary>
/// <param name="trk">
/// The Track instance to use for initialization.
/// </param>
public Track(Track trk)
{
// Copy events from the existing track into this one.
foreach(MidiEvent e in trk.MidiEvents)
{
this.MidiEvents.Add(e.Clone());
}
}
/// <summary>
/// Reads the number of tracks in the Midi file.
/// </summary>
/// <returns>
/// <b>MidiFileResult.Succes</b> if the track count and format type
/// are valid; otherwise, <b>MidiFileResult.InvalidFormat</b>.
/// </returns>
private MidiFileResult ReadTrackCount()
{
MidiFileResult result = MidiFileResult.Success;
byte[] trackCount = binReader.ReadBytes(TrackCountByteCount);
// Convert array to the same byte order as this platform.
ConvertByteArray(trackCount);
// Convert array to number.
tracks = new Track[BitConverter.ToInt16(trackCount, 0)];
// If there are more than one track and the Midi file is type 0.
if(tracks.Length > 1 && Format == 0)
{
// Indicate that the format is invalid. A type 0 Midi file can
// only have one track.
result = MidiFileResult.InvalidFormat;
}
// If the format is valid.
if(result == MidiFileResult.Success)
{
// Allocate tracks.
for(int i = 0; i < tracks.Length; i++)
{
tracks[i] = new Track();
}
}
return result;
}
/// <summary>
/// Adds a track to the Sequence.
/// </summary>
/// <param name="trk">
/// The track to add to the Sequence.
/// </param>
public void Add(Track trk)
{
tracks.Add(new TrackInfo(trk));
// Indicate that the sequence has changed.
dirty = true;
}
/// <summary>
/// Initializes a new instance of the TrackInfo class with the
/// specified track.
/// </summary>
/// <param name="trk">
/// The Track.
/// </param>
public TrackInfo(Track trk)
{
this.trk = trk;
version = trk.Version;
}
/// <summary>
/// Merge only Tracks that are soloed.
/// </summary>
private void MergeSoloTracks()
{
// For each track in the Sequence.
foreach(TrackInfo info in tracks)
{
// If the track is soloed and not muted.
if(info.trk.Solo && !info.trk.Mute)
{
// Merge track.
mergedTrack = Track.Merge(mergedTrack, info.trk);
}
}
}
/// <summary>
/// Gets all of the Tracks in the Sequence merged into one Track.
/// </summary>
/// <returns>
/// The Tracks in the Sequence merged into one Track.
/// </returns>
/// <remarks>
/// Only Tracks that are not muted are merged into one Track. Also, if
/// any of the Tracks have been soloed, only those Tracks are merged.
/// </remarks>
public Track GetMergedTrack()
{
// If the Sequence has been changed.
if(IsDirty())
{
mergedTrack = new Track();
// If any of the tracks have been soloed.
if(IsSolo())
{
// Merge only the solo tracks.
MergeSoloTracks();
}
// Else none of the tracks have been soloed.
else
{
// For each track in the sequence.
foreach(TrackInfo info in tracks)
{
// If the track is not muted.
if(!info.trk.Mute)
{
// Merge track.
mergedTrack = Track.Merge(mergedTrack, info.trk);
}
}
}
// Update versioning information.
foreach(TrackInfo info in tracks)
{
info.version = info.trk.Version;
}
// Indicate that the merged track has been updated.
dirty = false;
}
return mergedTrack;
}
/// <summary>
/// Merges two tracks together.
/// </summary>
/// <param name="trackA">
/// The first of two tracks to merge.
/// </param>
/// <param name="trackB">
/// The second of two tracks to merge.
/// </param>
/// <returns>
/// The merged track.
/// </returns>
public static Track Merge(Track trackA, Track trackB)
{
Track trkA = new Track(trackA);
Track trkB = new Track(trackB);
Track mergedTrack = new Track();
int a = 0, b = 0;
//
// The following algorithm merges two Midi tracks together. It
// assumes that both tracks are valid in that both end with a
// end of track meta message.
//
// While neither the end of track A or track B has been reached.
while(a < trkA.Count - 1 && b < trkB.Count - 1)
{
// While the end of track A has not been reached and the
// current Midi event in track A comes before the current Midi
// event in track B.
while(a < trkA.Count - 1 && trkA[a].Ticks <= trkB[b].Ticks)
{
// Slide the events in track B backwards by the amount of
// ticks in the current event in track A. This keeps both
// tracks in sync.
trkB.Slide(b, -trkA[a].Ticks);
// Add the current event in track A to the merged track.
mergedTrack.Add(trkA[a]);
// Move to the next Midi event in track A.
a++;
}
// If the end of track A has not yet been reached.
if(a < trkA.Count - 1)
{
// While the end of track B has not been reached and the
// current Midi event in track B comes before the current Midi
// event in track A.
while(b < trkB.Count - 1 && trkB[b].Ticks < trkA[a].Ticks)
{
// Slide the events in track A backwards by the amount of
// ticks in the current event in track B. This keeps both
// tracks in sync.
trkA.Slide(a, -trkB[b].Ticks);
// Add the current event in track B to the merged track.
mergedTrack.Add(trkB[b]);
// Move forward to the next Midi event in track B.
b++;
}
}
}
// If the end of track A has not yet been reached.
if(a < trkA.Count - 1)
{
// Add the rest of the events in track A to the merged track.
while(a < trkA.Count)
{
mergedTrack.Add(trkA[a]);
a++;
}
}
// Else if the end of track B has not yet been reached.
else if(b < trkB.Count - 1)
{
// Add the rest of the events in track B to the merged track.
while(b < trkB.Count)
{
mergedTrack.Add(trkB[b]);
b++;
}
}
return mergedTrack;
}
public void beginRecording(int instrument)
{
stopallnotes();
//add new track!
Track newtrack = new Track();
int nchannel = getCurChannelRecording() + 1;
//Set instrument
builder.Command = ChannelCommand.ProgramChange;
builder.MidiChannel = nchannel;
builder.Data1 = instrument;
builder.Build();
newtrack.Insert(0, builder.Result);
this.midiFilePlayer1.sequence.Add(newtrack);
//Also important: send event to the output device.
outDevice.Send(builder.Result);
recordTicks = new ArrayList();
recordNotes = new ArrayList();
midiFilePlayer1.Start();
isRecording = true;
}
/// <summary>
/// Initializes a new instance of the TrackInfo class with the
/// specified track.
/// </summary>
/// <param name="trk">
/// The Track.
/// </param>
public TrackInfo(Track trk)
{
this.trk = trk;
version = trk.Version;
}
