/// <summary>Parse a voice event from the data stream.</summary>
/// <param name="deltaTime">The previously parsed delta-time for this event.</param>
/// <param name="messageType">The previously parsed type of message we're expecting to find.</param>
/// <param name="channel">The previously parsed channel for this message.</param>
/// <param name="data">The data stream from which to read the event information.</param>
/// <param name="pos">The position of the start of the event information.</param>
/// <returns>The parsed voice MIDI event.</returns>
private static MidiEvent ParseVoiceEvent(long deltaTime, byte messageType, byte channel, byte [] data, ref long pos)
{
try
{
MidiEvent tempEvent = null;
// Create the correct voice event based on its message id/type
switch (messageType)
{
// NOTE OFF
case 0x8:
// **Adding this check seems to make GH1 mids work....GH2s are
// a little more complicated**
if (pos < data.GetLength(0) - 1)
{
tempEvent = new NoteOff(deltaTime, channel, data[pos], data[pos + 1]);
}
pos += 2;
break;
// NOTE ON
case 0x9:
tempEvent = new NoteOn(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// AFTERTOUCH
case 0xA:
tempEvent = new Aftertouch(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// CONTROLLER
case 0xB:
tempEvent = new Controller(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// PROGRAM CHANGE
case 0xC:
tempEvent = new ProgramChange(deltaTime, channel, data[pos]);
pos += 1;
break;
// CHANNEL PRESSURE
case 0xD:
tempEvent = new ChannelPressure(deltaTime, channel, data[pos]);
pos += 1;
break;
// PITCH WHEEL
case 0xE:
int position = ((data[pos] << 8) | data[pos + 1]);
byte upper, lower;
MidiEvent.Split14BitsToBytes(position, out upper, out lower);
tempEvent = new PitchWheel(deltaTime, channel, upper, lower);
pos += 2;
break;
// UH OH!
default: throw new ArgumentOutOfRangeException("messageType", messageType, "Not a voice message.");
}
// Return the newly parsed event
return(tempEvent);
}
// Something bad happened; wrap it in a parser exception
catch (Exception exc) { throw new MidiParserException("Unable to parse voice MIDI event.", exc, pos); }
}
/// <summary>Parse a voice event from the data stream.</summary>
/// <param name="deltaTime">The previously parsed delta-time for this event.</param>
/// <param name="messageType">The previously parsed type of message we're expecting to find.</param>
/// <param name="channel">The previously parsed channel for this message.</param>
/// <param name="data">The data stream from which to read the event information.</param>
/// <param name="pos">The position of the start of the event information.</param>
/// <returns>The parsed voice MIDI event.</returns>
private static MidiEvent ParseVoiceEvent(long deltaTime, byte messageType, byte channel, byte[] data, ref long pos)
{
try {
MidiEvent tempEvent = null;
// Create the correct voice event based on its message id/type
switch (messageType)
{
// NOTE OFF
case OffNoteVoiceMidiEvent.CategoryId:
tempEvent = new OffNoteVoiceMidiEvent(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// NOTE ON
case OnNoteVoiceMidiEvent.CategoryId:
tempEvent = new OnNoteVoiceMidiEvent(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// AFTERTOUCH
case AftertouchNoteVoiceMidiEvent.CategoryId:
tempEvent = new AftertouchNoteVoiceMidiEvent(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// CONTROLLER
case ControllerVoiceMidiEvent.CategoryId:
tempEvent = new ControllerVoiceMidiEvent(deltaTime, channel, data[pos], data[pos + 1]);
pos += 2;
break;
// PROGRAM CHANGE
case ProgramChangeVoiceMidiEvent.CategoryId:
tempEvent = new ProgramChangeVoiceMidiEvent(deltaTime, channel, data[pos]);
pos += 1;
break;
// CHANNEL PRESSURE
case ChannelPressureVoiceMidiEvent.CategoryId:
tempEvent = new ChannelPressureVoiceMidiEvent(deltaTime, channel, data[pos]);
pos += 1;
break;
// PITCH WHEEL
case PitchWheelVoiceMidiEvent.CategoryId:
int position = ((data[pos] << 8) | data[pos + 1]);
byte upper, lower;
MidiEvent.Split14BitsToBytes(position, out upper, out lower);
tempEvent = new PitchWheelVoiceMidiEvent(deltaTime, channel, upper, lower);
pos += 2;
break;
// UH OH!
default:
Validate.ThrowOutOfRange("messageType", messageType, 0x8, 0xE);
break;
}
// Return the newly parsed event
return(tempEvent);
}
// Something bad happened; wrap it in a parser exception
catch (Exception exc) { throw new MidiParserException("Unable to parse voice MIDI event.", exc, pos); }
}
