public MidiFile(byte[] data)
{
var position = 0;
if (Reader.ReadString(data, ref position, 4) != "MThd")
{
throw new FormatException("Invalid file header (expected MThd)");
}
if (Reader.Read32(data, ref position) != 6)
{
throw new FormatException("Invalid header length (expected 6)");
}
Format = (MidiFormat)Reader.Read16(data, ref position);
TracksCount = Reader.Read16(data, ref position);
PulsesPerQuarter = Reader.Read16(data, ref position);
if ((PulsesPerQuarter & 0x8000) != 0)
{
throw new FormatException("Invalid timing mode (SMPTE timecode not supported)");
}
Tracks = new MidiTrack[TracksCount];
for (var i = 0; i < TracksCount; i++)
{
Tracks[i] = ParseTrack(i, data, ref position, ref PulsesPerQuarter, ref BeatsPerMinute);
}
}
public HeaderChunk(MidiFormat Format, uint Length, uint NumTracks, ushort Division)
{
this.Format = Format;
this.Type = ChunkType.Header;
this.Length = Length;
this.NumTracks = NumTracks;
this.Division = new DivisionInfo(Division);
}
public MidiFile(MidiFormat format, List <MidiTrack> tracks, ushort ticksPerqn)
{
_tracks = tracks ?? throw new ArgumentException("Tracks must not be null", nameof(tracks));
if (_tracks.Count == 0)
{
throw new ArgumentException("No tracks provided to Midi File", nameof(tracks));
}
_format = format;
_ticksPerQn = ticksPerqn;
Duration = ProcessTempoMap();
}
// Set midi format
static void GetMidiFormatType(ref byte[] file, ref MidiFormat format)
{
uint data = ((uint)file[8] << 8) + ((uint)file[9] << 0);
if (0 == data)
{
format = MidiFormat.Single_MultiChannelTrack;
}
else if (1 == data)
{
format = MidiFormat.OneOrMore_simultaneousTrack;
}
else if (2 == data)
{
format = MidiFormat.OneOrMore_independentTrack;
}
}
public static string GetMidiFormatString(MidiFormat value)
{
return(Enum.GetName(typeof(MidiFormat), value));
}
