private void ReadHeader(IReadable input)
{
if (input.ReadInt32BE() != 6)
{
throw new Exception("Midi header is invalid.");
}
TrackFormat = (MidiTrackFormat)input.ReadInt16BE();
Tracks = new MidiTrack[input.ReadInt16BE()];
var div = input.ReadInt16BE();
Division = div & 0x7FFF;
TimingStandard = ((div & 0x8000) > 0) ? MidiTimeFormat.FramesPerSecond : MidiTimeFormat.TicksPerBeat;
}
private static MidiEvent ReadSystemCommonMessage(IReadable input, int delta, byte status)
{
switch ((SystemCommonTypeEnum)status)
{
case SystemCommonTypeEnum.SystemExclusive2:
case SystemCommonTypeEnum.SystemExclusive:
{
var maker = input.ReadInt16BE();
if (maker == 0x0)
{
maker = input.ReadInt16BE();
}
else if (maker == 0xF7)
{
return(null);
}
var data = new FastList <byte>();
var b = input.ReadByte();
while (b != 0xF7)
{
data.Add((byte)b);
b = input.ReadByte();
}
return(new SystemExclusiveEvent(delta, status, maker, data.ToArray()));
}
case SystemCommonTypeEnum.MtcQuarterFrame:
return(new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0));
case SystemCommonTypeEnum.SongPosition:
return(new SystemCommonEvent(delta, status, (byte)input.ReadByte(), (byte)input.ReadByte()));
case SystemCommonTypeEnum.SongSelect:
return(new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0));
case SystemCommonTypeEnum.TuneRequest:
return(new SystemCommonEvent(delta, status, 0, 0));
default:
throw new Exception("The system common message was invalid or unsupported : " + status);
}
}
private static MidiEvent ReadMetaMessage(IReadable input, int delta, byte status)
{
var metaStatus = input.ReadByte();
switch ((MetaEventTypeEnum)metaStatus)
{
case MetaEventTypeEnum.SequenceNumber:
{
var count = input.ReadByte();
if (count == 0)
{
return(new MetaNumberEvent(delta, status, (byte)metaStatus, -1));
}
else if (count == 2)
{
return(new MetaNumberEvent(delta, status, (byte)metaStatus, input.ReadInt16BE()));
}
else
{
throw new Exception("Invalid sequence number event.");
}
}
case MetaEventTypeEnum.TextEvent:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.CopyrightNotice:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.SequenceOrTrackName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.InstrumentName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.LyricText:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.MarkerText:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.CuePoint:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.PatchName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.PortName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.MidiChannel:
if (input.ReadByte() != 1)
{
throw new Exception("Invalid midi channel event. Expected size of 1.");
}
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.MidiPort:
if (input.ReadByte() != 1)
{
throw new Exception("Invalid midi port event. Expected size of 1.");
}
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.EndOfTrack:
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.Tempo:
if (input.ReadByte() != 3)
{
throw new Exception("Invalid tempo event. Expected size of 3.");
}
return(new MetaNumberEvent(delta, status, (byte)metaStatus, (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte()));
case MetaEventTypeEnum.SmpteOffset:
if (input.ReadByte() != 5)
{
throw new Exception("Invalid smpte event. Expected size of 5.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.TimeSignature:
if (input.ReadByte() != 4)
{
throw new Exception("Invalid time signature event. Expected size of 4.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.KeySignature:
if (input.ReadByte() != 2)
{
throw new Exception("Invalid key signature event. Expected size of 2.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.SequencerSpecific:
var length = ReadVariableLength(input);
var data = input.ReadByteArray(length);
return(new MetaDataEvent(delta, status, (byte)metaStatus, data));
}
throw new Exception("Not a valid meta message Status: " + status + " Meta: " + metaStatus);
}
private static MidiEvent ReadSystemCommonMessage(IReadable input, int delta, byte status)
{
switch ((SystemCommonTypeEnum)status)
{
case SystemCommonTypeEnum.SystemExclusive2:
case SystemCommonTypeEnum.SystemExclusive:
{
var maker = input.ReadInt16BE();
if (maker == 0x0)
{
maker = input.ReadInt16BE();
}
else if (maker == 0xF7)
return null;
var data = new FastList<byte>();
var b = input.ReadByte();
while (b != 0xF7)
{
data.Add((byte)b);
b = input.ReadByte();
}
return new SystemExclusiveEvent(delta, status, maker, data.ToArray());
}
case SystemCommonTypeEnum.MtcQuarterFrame:
return new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0);
case SystemCommonTypeEnum.SongPosition:
return new SystemCommonEvent(delta, status, (byte)input.ReadByte(), (byte)input.ReadByte());
case SystemCommonTypeEnum.SongSelect:
return new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0);
case SystemCommonTypeEnum.TuneRequest:
return new SystemCommonEvent(delta, status, 0, 0);
default:
throw new Exception("The system common message was invalid or unsupported : " + status);
}
}
private static MidiEvent ReadMetaMessage(IReadable input, int delta, byte status)
{
var metaStatus = input.ReadByte();
switch ((MetaEventTypeEnum)metaStatus)
{
case MetaEventTypeEnum.SequenceNumber:
{
var count = input.ReadByte();
if (count == 0)
return new MetaNumberEvent(delta, status, (byte)metaStatus, -1);
else if (count == 2)
{
return new MetaNumberEvent(delta, status, (byte)metaStatus, input.ReadInt16BE());
}
else
throw new Exception("Invalid sequence number event.");
}
case MetaEventTypeEnum.TextEvent:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.CopyrightNotice:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.SequenceOrTrackName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.InstrumentName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.LyricText:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.MarkerText:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.CuePoint:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.PatchName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.PortName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.MidiChannel:
if (input.ReadByte() != 1)
throw new Exception("Invalid midi channel event. Expected size of 1.");
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.MidiPort:
if (input.ReadByte() != 1)
throw new Exception("Invalid midi port event. Expected size of 1.");
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.EndOfTrack:
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.Tempo:
if (input.ReadByte() != 3)
throw new Exception("Invalid tempo event. Expected size of 3.");
return new MetaNumberEvent(delta, status, (byte)metaStatus, (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte());
case MetaEventTypeEnum.SmpteOffset:
if (input.ReadByte() != 5)
throw new Exception("Invalid smpte event. Expected size of 5.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.TimeSignature:
if (input.ReadByte() != 4)
throw new Exception("Invalid time signature event. Expected size of 4.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.KeySignature:
if (input.ReadByte() != 2)
throw new Exception("Invalid key signature event. Expected size of 2.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.SequencerSpecific:
var length = ReadVariableLength(input);
var data = input.ReadByteArray(length);
return new MetaDataEvent(delta, status, (byte)metaStatus, data);
}
throw new Exception("Not a valid meta message Status: " + status + " Meta: " + metaStatus);
}
private void ReadHeader(IReadable input)
{
if (input.ReadInt32BE() != 6)
throw new Exception("Midi header is invalid.");
TrackFormat = (MidiTrackFormat)input.ReadInt16BE();
Tracks = new MidiTrack[input.ReadInt16BE()];
var div = input.ReadInt16BE();
Division = div & 0x7FFF;
TimingStandard = ((div & 0x8000) > 0) ? MidiTimeFormat.FramesPerSecond : MidiTimeFormat.TicksPerBeat;
}
