/// <summary> /// Determines if this is an end track event /// </summary> public static bool IsEndTrack(MidiEvent midiEvent) { if (midiEvent != null) { MetaEvent me = midiEvent as MetaEvent; if (me != null) { return(me.MetaEventType == MetaEventType.EndTrack); } } return(false); }
/// <summary> /// Constructs a MidiEvent from a BinaryStream /// </summary> /// <param name="br">The binary stream of MIDI data</param> /// <param name="previous">The previous MIDI event (pass null for first event)</param> /// <returns>A new MidiEvent</returns> public static MidiEvent ReadNextEvent(BinaryReader br, MidiEvent previous) { int deltaTime = MidiEvent.ReadVarInt(br); MidiCommandCode commandCode; int channel = 1; byte b = br.ReadByte(); if ((b & 0x80) == 0) { // a running command - command & channel are same as previous commandCode = previous.CommandCode; channel = previous.Channel; br.BaseStream.Position--; // need to push this back } else { if ((b & 0xF0) == 0xF0) { // both bytes are used for command code in this case commandCode = (MidiCommandCode)b; } else { commandCode = (MidiCommandCode)(b & 0xF0); channel = (b & 0x0F) + 1; } } MidiEvent me; switch (commandCode) { case MidiCommandCode.NoteOn: me = new NoteOnEvent(br); break; case MidiCommandCode.NoteOff: case MidiCommandCode.KeyAfterTouch: me = new NoteEvent(br); break; case MidiCommandCode.ControlChange: me = new ControlChangeEvent(br); break; case MidiCommandCode.PatchChange: me = new PatchChangeEvent(br); break; case MidiCommandCode.ChannelAfterTouch: me = new ChannelAfterTouchEvent(br); break; case MidiCommandCode.PitchWheelChange: me = new PitchWheelChangeEvent(br); break; case MidiCommandCode.TimingClock: case MidiCommandCode.StartSequence: case MidiCommandCode.ContinueSequence: case MidiCommandCode.StopSequence: me = new MidiEvent(); break; case MidiCommandCode.Sysex: me = SysexEvent.ReadSysexEvent(br); break; case MidiCommandCode.MetaEvent: me = MetaEvent.ReadMetaEvent(br); break; default: throw new FormatException(String.Format("Unsupported MIDI Command Code {0:X2}", (byte)commandCode)); } me.channel = channel; me.deltaTime = deltaTime; me.commandCode = commandCode; return(me); }
/// <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: 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); }