/// <summary>
/// Creates a new midi event that represents a meta event.
/// </summary>
/// <param name="absoluteTime">The absolute-time of the event.</param>
/// <param name="deltaTime">The delta-time of the event.</param>
/// <param name="metaType">The type of meta event.</param>
/// <param name="data">The data for the meta event.</param>
/// <returns>Never returns null.</returns>
private MidiFileEvent CreateMetaEvent(long absoluteTime, long deltaTime, byte metaType, byte[] data)
{
var midiEvent = new MidiFileEvent();
midiEvent.AbsoluteTime = absoluteTime;
midiEvent.DeltaTime = deltaTime;
midiEvent.Message = this.midiMessageFactory.CreateMetaMessage((MidiMetaType)metaType, data);
return(midiEvent);
}
/// <summary>
/// Creates a new midi event that represents a system exclusive event.
/// </summary>
/// <param name="absoluteTime">The absolute-time of the event.</param>
/// <param name="deltaTime">The delta-time of the event.</param>
/// <param name="data">The data for the sysex event.</param>
/// <param name="isContinuation">An indication if the sysex data is a continuation on a previous message.</param>
/// <returns>Never returns null.</returns>
private MidiFileEvent CreateSysExEvent(long absoluteTime, long deltaTime, byte[] data, bool isContinuation)
{
var midiEvent = new MidiFileEvent();
midiEvent.AbsoluteTime = absoluteTime;
midiEvent.DeltaTime = deltaTime;
midiEvent.Message = this.midiMessageFactory.CreateSysExMessage(data, isContinuation);
return(midiEvent);
}
/// <summary>
/// Creates a new midi event that represents a midi event.
/// </summary>
/// <param name="absoluteTime">The absolute-time of the event.</param>
/// <param name="deltaTime">The delta-time of the event.</param>
/// <param name="midiMsg">The midi event data.</param>
/// <returns>Never returns null.</returns>
private MidiFileEvent CreateMidiEvent(long absoluteTime, long deltaTime, int midiMsg)
{
var midiEvent = new MidiFileEvent();
midiEvent.AbsoluteTime = absoluteTime;
midiEvent.DeltaTime = deltaTime;
midiEvent.Message = this.midiMessageFactory.CreateShortMessage(midiMsg);
return(midiEvent);
}
/// <summary>
/// Creates a new midi event that represents a midi event.
/// </summary>
/// <param name="absoluteTime">The absolute-time of the event.</param>
/// <param name="deltaTime">The delta-time of the event.</param>
/// <param name="midiMsg">The midi event data.</param>
/// <returns>Never returns null.</returns>
private MidiFileEvent CreateMidiEvent(long absoluteTime, long deltaTime, int midiMsg)
{
var midiEvent = new MidiFileEvent
{
AbsoluteTime = absoluteTime,
DeltaTime = deltaTime,
Message = _midiMessageFactory.CreateShortMessage(midiMsg)
};
return(midiEvent);
}
/// <summary>
/// Creates a new midi event that represents a meta event.
/// </summary>
/// <param name="absoluteTime">The absolute-time of the event.</param>
/// <param name="deltaTime">The delta-time of the event.</param>
/// <param name="metaType">The type of meta event.</param>
/// <param name="data">The data for the meta event.</param>
/// <returns>Never returns null.</returns>
private MidiFileEvent CreateMetaEvent(long absoluteTime, long deltaTime, byte metaType, byte[] data)
{
var midiEvent = new MidiFileEvent
{
AbsoluteTime = absoluteTime,
DeltaTime = deltaTime,
Message = _midiMessageFactory.CreateMetaMessage((MidiMetaType)metaType, data)
};
return(midiEvent);
}
/// <summary>
/// Reads the midi track from the midi file.
/// </summary>
/// <param name="context">File context of the midi file being read. Must not be null.</param>
/// <returns>Returns the custom chunk object containing the data that was read.</returns>
public override object Read(ChunkFileContext context)
{
Check.IfArgumentNull(context, nameof(context));
var reader = context.Services.GetService <FileChunkReader>();
var stream = reader.CurrentStream;
var chunk = new MTrkChunk();
var events = new List <MidiFileEvent>();
chunk.Events = events;
var midiReader = new MidiFileStreamReader(stream);
// use the indication to copy buffers.
_midiMessageFactory.CopyData = context.CopyStreams;
while (midiReader.ReadNextEvent())
{
MidiFileEvent midiEvent = null;
switch (midiReader.EventType)
{
case MidiFileEventType.Event:
midiEvent = CreateMidiEvent(midiReader.AbsoluteTime, midiReader.DeltaTime, midiReader.MidiEvent);
break;
case MidiFileEventType.SystemExclusive:
midiEvent = CreateSysExEvent(midiReader.AbsoluteTime, midiReader.DeltaTime, midiReader.Data, false);
break;
case MidiFileEventType.SystemExclusiveContinuation:
midiEvent = CreateSysExEvent(midiReader.AbsoluteTime, midiReader.DeltaTime, midiReader.Data, true);
break;
case MidiFileEventType.Meta:
midiEvent = CreateMetaEvent(midiReader.AbsoluteTime, midiReader.DeltaTime, midiReader.MetaEvent, midiReader.Data);
break;
}
if (midiEvent != null)
{
events.Add(midiEvent);
}
}
return(chunk);
}
