/// <summary>
/// Reads a meta-event from a stream
/// </summary>
/// <param name="br">A binary reader based on the stream of MIDI data</param>
/// <returns>A new MetaEvent object</returns>
public static MetaEvent ReadMetaEvent(BinaryReader br)
{
MetaEventType metaEvent = (MetaEventType) br.ReadByte();
int length = ReadVarInt(br);
MetaEvent me = new MetaEvent();
switch(metaEvent)
{
case MetaEventType.TrackSequenceNumber: // Sets the track's sequence number.
me = new TrackSequenceNumberEvent(br,length);
break;
case MetaEventType.TextEvent: // Text event
case MetaEventType.Copyright: // Copyright
case MetaEventType.SequenceTrackName: // Sequence / Track Name
case MetaEventType.TrackInstrumentName: // Track instrument name
case MetaEventType.Lyric: // lyric
case MetaEventType.Marker: // marker
case MetaEventType.CuePoint: // cue point
case MetaEventType.ProgramName:
case MetaEventType.DeviceName:
me = new TextEvent(br,length);
break;
case MetaEventType.EndTrack: // This event must come at the end of each track
if(length != 0)
{
throw new FormatException("End track length");
}
break;
case MetaEventType.SetTempo: // Set tempo
me = new TempoEvent(br,length);
break;
case MetaEventType.TimeSignature: // Time signature
me = new TimeSignatureEvent(br,length);
break;
case MetaEventType.KeySignature: // Key signature
me = new KeySignatureEvent(br, length);
break;
case MetaEventType.SequencerSpecific: // Sequencer specific information
me = new SequencerSpecificEvent(br, length);
break;
case MetaEventType.SmpteOffset:
me = new SmpteOffsetEvent(br, length);
break;
default:
//System.Windows.Forms.MessageBox.Show(String.Format("Unsupported MetaEvent {0} length {1} pos {2}",metaEvent,length,br.BaseStream.Position));
me.data = br.ReadBytes(length);
if (me.data.Length != length)
{
throw new FormatException("Failed to read metaevent's data fully");
}
break;
}
me.metaEvent = metaEvent;
me.metaDataLength = length;
return me;
}
private string ToMBT(long eventTime, int ticksPerQuarterNote, TimeSignatureEvent timeSignature)
{
int beatsPerBar = timeSignature == null ? 4 : timeSignature.Numerator;
int ticksPerBar = timeSignature == null ? ticksPerQuarterNote * 4 : (timeSignature.Numerator * ticksPerQuarterNote * 4) / (1 << timeSignature.Denominator);
int ticksPerBeat = ticksPerBar / beatsPerBar;
long bar = 1 + (eventTime / ticksPerBar);
long beat = 1 + ((eventTime % ticksPerBar) / ticksPerBeat);
long tick = eventTime % ticksPerBeat;
return String.Format("{0}:{1}:{2}", bar, beat, tick);
}
/// <summary>
/// Reads a meta-event from a stream
/// </summary>
/// <param name="br">A binary reader based on the stream of MIDI data</param>
/// <returns>A new MetaEvent object</returns>
public static MetaEvent ReadMetaEvent(BinaryReader br)
{
MetaEventType metaEvent = (MetaEventType)br.ReadByte();
int length = ReadVarInt(br);
MetaEvent me = new MetaEvent();
switch (metaEvent)
{
case MetaEventType.TextEvent: // Text event
case MetaEventType.Copyright: // Copyright
case MetaEventType.SequenceTrackName: // Sequence / Track Name
case MetaEventType.TrackInstrumentName: // Track instrument name
case MetaEventType.Lyric: // lyric
case MetaEventType.Marker: // marker
case MetaEventType.CuePoint: // cue point
case MetaEventType.ProgramName:
case MetaEventType.DeviceName:
me = new TextEvent(br, length);
break;
case MetaEventType.EndTrack: // This event must come at the end of each track
if (length != 0)
{
throw new FormatException("End track length");
}
break;
case MetaEventType.SetTempo: // Set tempo
me = new TempoEvent(br, length);
break;
case MetaEventType.TimeSignature: // Time signature
me = new TimeSignatureEvent(br, length);
break;
default:
//System.Windows.Forms.MessageBox.Show(String.Format("Unsupported MetaEvent {0} length {1} pos {2}",metaEvent,length,br.BaseStream.Position));
me.data = br.ReadBytes(length);
if (me.data.Length != length)
{
throw new FormatException("Failed to read metaevent's data fully");
}
break;
}
me.metaEvent = metaEvent;
me.metaDataLength = length;
return(me);
}
private string ToMBT(long eventTime, int ticksPerQuarterNote, NAudio.Midi.TimeSignatureEvent timeSignature)
{
int beatsPerBar = timeSignature == null ? 4 : timeSignature.Numerator;
int ticksPerBar = timeSignature == null ? ticksPerQuarterNote * 4 : (timeSignature.Numerator * ticksPerQuarterNote * 4) / (1 << timeSignature.Denominator);
int ticksPerBeat = ticksPerBar / beatsPerBar;
long bar = (eventTime / ticksPerBar);
long beat = ((eventTime % ticksPerBar) / ticksPerBeat);
long tick = eventTime % ticksPerBeat;
float milsPerTick = milliSecondsPerQuartNote / ticksPerBeat;
String initialMidiString = currentMidiEvent.ToString();
int currentChannel = getChannelNumber(initialMidiString);
int noteLength = getMidiNoteLength(initialMidiString);
if (noteLength != 0 && currentChannel > -1)
{
//START TIME AND DURATION TIME ARE CALCULATED HERE!!!!
Note newNote = new Note();
//Double theStartTime = (bar * milliSecondsPerQuartNote * 4) + (milliSecondsPerQuartNote * (beat));
Double theStartTime = eventTime * milsPerTick;
newNote.startTime = theStartTime; //Start time Measured in milliseconds
String midiInfo = currentMidiEvent.ToString();
String typeOfNote = getTypeOfNote(midiInfo, currentChannel);
newNote.notePitch = typeOfNote;
newNote.noteVelocity = getVelocity(midiInfo);
newNote.notePitchNumber = GDMethods.getPitchNumber(newNote.notePitch);
//Debug.Log("Converted " + typeOfNote + " to -> " + newNote.notePitchNumber);
Double timeOfNote = noteLength;
//newNote.durationTime = ((((double)(timeOfNote))/(double)ticksPerBeat)* milliSecondsPerQuartNote);//Duration slso meseaured in milliseconds
//TODO - check this
newNote.durationTime = noteLength * milsPerTick;
Channels[currentChannel].Notes.Add(newNote);
if (!Channels[currentChannel].TypesOfNotes.Contains(typeOfNote))
{
Channels[currentChannel].TypesOfNotes.Add(typeOfNote);
}
}
string finalReturn = String.Format("{0}:{1}:{2}", bar + 1, beat + 1, tick);
Console.WriteLine(finalReturn);
return(finalReturn);
//Print out this string to see full output
}
public static MetaEvent ReadMetaEvent(BinaryReader br)
{
MetaEventType metaEventType = (MetaEventType)br.ReadByte();
int num = MidiEvent.ReadVarInt(br);
MetaEvent metaEvent = new MetaEvent();
MetaEventType metaEventType2 = metaEventType;
if (metaEventType2 <= MetaEventType.SetTempo)
{
switch (metaEventType2)
{
case MetaEventType.TrackSequenceNumber:
metaEvent = new TrackSequenceNumberEvent(br, num);
goto IL_E9;
case MetaEventType.TextEvent:
case MetaEventType.Copyright:
case MetaEventType.SequenceTrackName:
case MetaEventType.TrackInstrumentName:
case MetaEventType.Lyric:
case MetaEventType.Marker:
case MetaEventType.CuePoint:
case MetaEventType.ProgramName:
case MetaEventType.DeviceName:
metaEvent = new TextEvent(br, num);
goto IL_E9;
default:
if (metaEventType2 != MetaEventType.EndTrack)
{
if (metaEventType2 == MetaEventType.SetTempo)
{
metaEvent = new TempoEvent(br, num);
goto IL_E9;
}
}
else
{
if (num != 0)
{
throw new FormatException("End track length");
}
goto IL_E9;
}
break;
}
}
else
{
if (metaEventType2 == MetaEventType.SmpteOffset)
{
metaEvent = new SmpteOffsetEvent(br, num);
goto IL_E9;
}
switch (metaEventType2)
{
case MetaEventType.TimeSignature:
metaEvent = new TimeSignatureEvent(br, num);
goto IL_E9;
case MetaEventType.KeySignature:
metaEvent = new KeySignatureEvent(br, num);
goto IL_E9;
default:
if (metaEventType2 == MetaEventType.SequencerSpecific)
{
metaEvent = new SequencerSpecificEvent(br, num);
goto IL_E9;
}
break;
}
}
metaEvent.data = br.ReadBytes(num);
if (metaEvent.data.Length != num)
{
throw new FormatException("Failed to read metaevent's data fully");
}
IL_E9:
metaEvent.metaEvent = metaEventType;
metaEvent.metaDataLength = num;
return(metaEvent);
}
