Exemplo n.º 1
0
        /// <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);
        }
Exemplo n.º 2
0
        /// <summary>
        /// Creates a MidiEvent from a raw message received using
        /// the MME MIDI In APIs
        /// </summary>
        /// <param name="rawMessage">The short MIDI message</param>
        /// <returns>A new MIDI Event</returns>
        public static MidiEvent FromRawMessage(int rawMessage)
        {
            long            absoluteTime = 0;
            int             b            = rawMessage & 0xFF;
            int             data1        = (rawMessage >> 8) & 0xFF;
            int             data2        = (rawMessage >> 16) & 0xFF;
            MidiCommandCode commandCode;
            int             channel = 1;

            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:
            case MidiCommandCode.NoteOff:
            case MidiCommandCode.KeyAfterTouch:
                if (data2 > 0 && commandCode == MidiCommandCode.NoteOn)
                {
                    me = new NoteOnEvent(absoluteTime, channel, data1, data2, 0);
                }
                else
                {
                    me = new NoteEvent(absoluteTime, channel, commandCode, data1, data2);
                }
                break;

            case MidiCommandCode.ControlChange:
                me = new ControlChangeEvent(absoluteTime, channel, (MidiController)data1, data2);
                break;

            case MidiCommandCode.PatchChange:
                me = new PatchChangeEvent(absoluteTime, channel, data1);
                break;

            case MidiCommandCode.ChannelAfterTouch:
                me = new ChannelAfterTouchEvent(absoluteTime, channel, data1);
                break;

            case MidiCommandCode.PitchWheelChange:
                me = new PitchWheelChangeEvent(absoluteTime, channel, data1 + (data2 << 7));
                break;

            case MidiCommandCode.TimingClock:
            case MidiCommandCode.StartSequence:
            case MidiCommandCode.ContinueSequence:
            case MidiCommandCode.StopSequence:
            case MidiCommandCode.AutoSensing:
                me = new MidiEvent(absoluteTime, channel, commandCode);
                break;

            case MidiCommandCode.MetaEvent:
            case MidiCommandCode.Sysex:
            default:
                throw new FormatException(String.Format("Unsupported MIDI Command Code for Raw Message {0}", commandCode));
            }
            return(me);
        }