protected void Open()
{
MidiFileReader = File.Open(filepath, FileMode.Open);
ParseHeaderChunk();
while (MidiFileReader.Position < MidiFileReader.Length)
{
try
{
ParseTrackChunk();
}
catch
{
if (trackBeginnings.Count == 0)
{
throw new Exception("Corrupt first track chunk header");
}
else
{
ParseStatusText = "Chunk " + (trackcount - 1) + " has corrupt length\nCalculating length...";
var pos = trackBeginnings.Last();
var reader = new BufferByteReader(MidiFileReader, 10000, pos, MidiFileReader.Length - pos);
try
{
var len = TrackParser.GetCorruptChunkLength(reader);
trackLengths[trackLengths.Count - 1] = (uint)len;
MidiFileReader.Position = pos + len;
}
catch { throw new Exception("Could not determine length of corrupt chunk"); }
}
}
ParseNumber += 2;
cancel.ThrowIfCancellationRequested();
}
parsers = new TrackParser[trackcount];
}
public TrackParser(BufferByteReader reader, int ppq, int track, MIDILoaderSettings settings)
{
this.settings = settings;
this.reader = reader;
this.ppq = ppq;
this.track = track;
tempoMultiplier = ((double)500000 / ppq) / 1000000;
}
protected void FirstPassParse()
{
object l = new object();
int tracksParsed = 0;
ParseStage = ParsingStage.FirstPass;
Parallel.For(0, parsers.Length, new ParallelOptions()
{
CancellationToken = cancel
}, (i) =>
{
var reader = new BufferByteReader(MidiFileReader, 100000, trackBeginnings[i], trackLengths[i]);
parsers[i] = new TrackParser(reader, division, i, loaderSettings);
parsers[i].FirstPassParse();
lock (l)
{
tracksParsed++;
ParseNumber += 20;
ParseStatusText = "Analyzing MIDI\nTracks " + tracksParsed + " of " + parsers.Length;
Console.WriteLine("Pass 1 Parsed track " + tracksParsed + "/" + parsers.Length);
if (FirstKey > parsers[i].FirstKey)
{
FirstKey = parsers[i].FirstKey;
}
if (LastKey < parsers[i].LastKey)
{
LastKey = parsers[i].LastKey;
}
}
});
cancel.ThrowIfCancellationRequested();
var temposMerge = TimedMerger <TempoEvent> .MergeMany(parsers.Select(p => p.Tempos).ToArray(), t => t.time);
globalTempos = temposMerge.Cast <TempoEvent>().ToArray();
MidiNoteCount = parsers.Select(p => p.noteCount).Sum();
}
