private void LoadMidiFile(MidiFile midiFile)
{
_tempoChanges = new FastList <MidiFileSequencerTempoChange>();
//Converts midi to sample based format for easy sequencing
float bpm = 120.0f;
//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();
}
//Convert delta time to sample time
_synthData = new SynthEvent[midiFile.Tracks[0].MidiEvents.Length];
_division = midiFile.Division;
_eventIndex = 0;
CurrentTime = 0;
CurrentTempo = (int)bpm;
//Calculate sample based time using double counter and round down to nearest integer sample.
var absDelta = 0.0;
var absTick = 0;
var absTime = 0.0;
for (int x = 0; x < midiFile.Tracks[0].MidiEvents.Length; x++)
{
var mEvent = midiFile.Tracks[0].MidiEvents[x];
_synthData[x] = new SynthEvent(mEvent);
absTick += mEvent.DeltaTime;
absTime += mEvent.DeltaTime * (60000.0 / (bpm * midiFile.Division));
absDelta += Synth.SampleRate * mEvent.DeltaTime * (60.0 / (bpm * midiFile.Division));
_synthData[x].Delta = (int)(absDelta);
//Update tempo
if (IsTempoMessage(mEvent.Command, mEvent.Data1))
{
var meta = (MetaNumberEvent)mEvent;
bpm = MidiHelper.MicroSecondsPerMinute / meta.Value;
_tempoChanges.Add(new MidiFileSequencerTempoChange(bpm, absTick, (int)(absTime)));
}
}
EndTime = _synthData[_synthData.Length - 1].Delta;
}
public void DispatchEvent(int i, SynthEvent synthEvent)
{
_midiEventQueue.AddFirst(synthEvent);
_midiEventCounts[i]++;
}
public void LoadMidi(MidiFile midiFile)
{
_tempoChanges = new FastList <MidiFileSequencerTempoChange>();
// 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();
}
_division = midiFile.Division;
_eventIndex = 0;
_currentTime = 0;
// build synth events.
_synthData = new FastList <SynthEvent>();
// Converts midi to milliseconds for easy sequencing
double bpm = 120;
var absTick = 0;
var absTime = 0.0;
var metronomeLength = 0;
var metronomeTick = 0;
var metronomeTime = 0.0;
for (int x = 0; x < midiFile.Tracks[0].MidiEvents.Length; x++)
{
var mEvent = midiFile.Tracks[0].MidiEvents[x];
var synthData = new SynthEvent(mEvent);
_synthData.Add(synthData);
absTick += mEvent.DeltaTime;
absTime += mEvent.DeltaTime * (60000.0 / (bpm * midiFile.Division));
synthData.Delta = absTime;
if (mEvent.Command == MidiEventTypeEnum.Meta && mEvent.Data1 == (int)MetaEventTypeEnum.Tempo)
{
var meta = (MetaNumberEvent)mEvent;
bpm = MidiHelper.MicroSecondsPerMinute / (double)meta.Value;
_tempoChanges.Add(new MidiFileSequencerTempoChange(bpm, absTick, (int)(absTime)));
}
else if (mEvent.Command == MidiEventTypeEnum.Meta && mEvent.Data1 == (int)MetaEventTypeEnum.TimeSignature)
{
var meta = (MetaDataEvent)mEvent;
var timeSignatureDenominator = (int)Math.Pow(2, meta.Data[1]);
metronomeLength = (int)(_division * (4.0 / timeSignatureDenominator));
}
else if (mEvent.Command == MidiEventTypeEnum.ProgramChange)
{
var channel = mEvent.Channel;
if (!_firstProgramEventPerChannel.ContainsKey(channel))
{
_firstProgramEventPerChannel[channel] = synthData;
}
}
if (metronomeLength > 0)
{
while (metronomeTick < absTick)
{
var metronome = SynthEvent.NewMetronomeEvent(metronomeLength);
_synthData.Add(metronome);
metronome.Delta = metronomeTime;
metronomeTick += metronomeLength;
metronomeTime += metronomeLength * (60000.0 / (bpm * midiFile.Division));
}
}
}
_synthData.Sort((a, b) => (int)(a.Delta - b.Delta));
_endTime = absTime;
EndTick = absTick;
}
public void LoadMidi(MidiFile midiFile)
{
_tempoChanges = new FastList <MidiFileSequencerTempoChange>();
_division = midiFile.Division;
_eventIndex = 0;
_currentTime = 0;
// build synth events.
_synthData = new FastList <SynthEvent>();
// Converts midi to milliseconds for easy sequencing
double bpm = 120;
var absTick = 0;
var absTime = 0.0;
var metronomeLength = 0;
var metronomeTick = 0;
var metronomeTime = 0.0;
var previousTick = 0;
foreach (var mEvent in midiFile.Events)
{
var synthData = new SynthEvent(_synthData.Count, mEvent);
_synthData.Add(synthData);
var deltaTick = mEvent.Tick - previousTick;
absTick += deltaTick;
absTime += deltaTick * (60000.0 / (bpm * midiFile.Division));
synthData.Time = absTime;
previousTick = mEvent.Tick;
if (mEvent.Command == MidiEventType.Meta && mEvent.Data1 == (int)MetaEventTypeEnum.Tempo)
{
var meta = (MetaNumberEvent)mEvent;
bpm = MidiHelper.MicroSecondsPerMinute / (double)meta.Value;
_tempoChanges.Add(new MidiFileSequencerTempoChange(bpm, absTick, (int)(absTime)));
}
else if (mEvent.Command == MidiEventType.Meta && mEvent.Data1 == (int)MetaEventTypeEnum.TimeSignature)
{
var meta = (MetaDataEvent)mEvent;
var timeSignatureDenominator = (int)Math.Pow(2, meta.Data[1]);
metronomeLength = (int)(_division * (4.0 / timeSignatureDenominator));
}
else if (mEvent.Command == MidiEventType.ProgramChange)
{
var channel = mEvent.Channel;
if (!_firstProgramEventPerChannel.ContainsKey(channel))
{
_firstProgramEventPerChannel[channel] = synthData;
}
}
if (metronomeLength > 0)
{
while (metronomeTick < absTick)
{
var metronome = SynthEvent.NewMetronomeEvent(_synthData.Count, metronomeLength);
_synthData.Add(metronome);
metronome.Time = metronomeTime;
metronomeTick += metronomeLength;
metronomeTime += metronomeLength * (60000.0 / (bpm * midiFile.Division));
}
}
}
_synthData.Sort((a, b) =>
{
if (a.Time > b.Time)
{
return(1);
}
else if (a.Time < b.Time)
{
return(-1);
}
return(a.EventIndex - b.EventIndex);
});
_endTime = absTime;
EndTick = absTick;
}
