public void LoadMidi(MidiFile midi)
{
this.midi = midi;
sequencer.Stop();
sequencer.UnloadMidi();
sequencer.LoadMidi(midi);
}
public bool LoadMidi(MidiFile midiFile)
{
if (playing == true)
return false;
LoadMidiFile(midiFile);
return true;
}
//--Private Methods
private void LoadMidiFile(MidiFile midiFile)
{
//Converts midi to sample based format for easy sequencing
double BPM = 120.0;
//Combine all tracks into 1 track that is organized from lowest to highest absolute time
if(midiFile.Tracks.Length > 1 || midiFile.Tracks[0].EndTime == 0)
midiFile.CombineTracks();
mdata = new MidiMessage[midiFile.Tracks[0].MidiEvents.Length];
//Convert delta time to sample time
eventIndex = 0;
sampleTime = 0;
//Calculate sample based time using double counter and round down to nearest integer sample.
double absDelta = 0.0;
for (int x = 0; x < mdata.Length; x++)
{
MidiEvent mEvent = midiFile.Tracks[0].MidiEvents[x];
mdata[x] = new MidiMessage((byte)mEvent.Channel, (byte)mEvent.Command, (byte)mEvent.Data1, (byte)mEvent.Data2);
absDelta += synth.SampleRate * mEvent.DeltaTime * (60.0 / (BPM * midiFile.Division));
mdata[x].delta = (int)absDelta;
//Update tempo
if (mEvent.Command == 0xFF && mEvent.Data1 == 0x51)
BPM = Math.Round(MidiHelper.MicroSecondsPerMinute / (double)((MetaNumberEvent)mEvent).Value, 2);
}
//Set total time to proper value
totalTime = mdata[mdata.Length - 1].delta;
}
/// <summary>
/// Play current song.
/// </summary>
public void Play(SongFiles song)
{
if (!InitSynth())
return;
// Stop if playing another song
Stop();
// Load song data
string filename = EnumToFilename(song);
byte[] songData = LoadSong(filename);
if (songData == null)
return;
// Create song
MidiFile midiFile = new MidiFile(new MyMemoryFile(songData, filename));
if (midiSequencer.LoadMidi(midiFile))
{
midiSequencer.Play();
currentMidiName = filename;
playEnabled = true;
}
}
