private TrackEvent readMetaEvent(byte statusByte, BinaryReader reader, out uint readDataSize)
{
readDataSize = 0;
byte eventType = reader.ReadByte();
uint dataSize;
readDataSize += readVarLenNumeric(reader, out dataSize);
readDataSize += dataSize + 1 /* eventType */ + 1 /* statusByte */;
switch (eventType)
{
case 0x2f: // Track End
return(null);
case 0x51: // Tempo
{
// 四分音符の長さ(microsec, 10^-6
int tempo = (int)(readBENumeric(reader, 3));
TrackEvent ev = new TrackEvent();
ev.EventType = EventType.Tempo;
ev.Params = new object[] { tempo };
return(ev);
}
case 0x58: // 拍子
{
byte b1 = reader.ReadByte(); // 分子
byte b2 = reader.ReadByte(); // 分母(2のマイナス乗)
byte b3 = reader.ReadByte(); // 1拍当たりのMIDIクロック数
byte b4 = reader.ReadByte(); // 四分音符の中に入る32分の音符数
if (b3 != 0x18 || b4 != 0x08)
{
throw new SMFException("対応していないMIDIファイル:拍子記号");
}
}
return(null);
case 0x54:
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x08:
case 0x09:
case 0x20:
case 0x21:
case 0x59:
case 0x7f:
default:
reader.ReadBytes((int)dataSize); // 読み飛ばし
return(null);
}
}
private TrackEvent readMidiEvent(byte statusByte, byte prevStatusByte, BinaryReader reader, out uint readDataSize)
{
readDataSize = 2;
byte param1 = 0;
byte param2 = 0;
bool runningStatus = (statusByte & 0x80) == 0;
if (runningStatus)
{
param1 = statusByte;
statusByte = prevStatusByte;
readDataSize--;
}
else
{
param1 = reader.ReadByte();
}
int channel = (statusByte & 0x0f);
switch (statusByte >> 4)
{
case 0x8: // SMFNote Off
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int velocity = param2 & 0x7f;
TrackEvent ev = new TrackEvent();
ev.EventType = EventType.NoteOff;
ev.Params = new object[] { channel, noteNum, velocity };
return(ev);
}
case 0x9: // SMFNote On
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int velocity = param2 & 0x7f;
TrackEvent ev = new TrackEvent();
ev.EventType = velocity == 0 ? EventType.NoteOff : EventType.NoteOn;
ev.Params = new object[] { channel, noteNum, velocity };
return(ev);
}
case 0xa: // Polyphonic Key Pressure (Aftertouch)
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int amount = param2 & 0x7f;
}
break;
case 0xb: // Control Change
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int amount = param2 & 0x7f;
}
break;
case 0xc: // Program Change
{
int programNum = param1 & 0x7f;
}
break;
case 0xd: // Channel Pressure (After-touch)
{
int amount = param1 & 0x7f;
}
break;
case 0xe: // Pitch Wheel Change
{
param2 = reader.ReadByte();
readDataSize++;
int value = param1 + param2 << 7;
}
break;
}
return(null);
}
private TrackEvent readMetaEvent(byte statusByte, BinaryReader reader, out uint readDataSize)
{
readDataSize = 0;
byte eventType = reader.ReadByte();
uint dataSize;
readDataSize += readVarLenNumeric(reader, out dataSize);
readDataSize += dataSize + 1 /* eventType */ + 1 /* statusByte */;
switch (eventType)
{
case 0x2f: // Track End
return null;
case 0x51: // Tempo
{
// 四分音符の長さ(microsec, 10^-6
int tempo = (int)(readBENumeric(reader, 3));
TrackEvent ev = new TrackEvent();
ev.EventType = EventType.Tempo;
ev.Params = new object[] { tempo };
return ev;
}
case 0x58: // 拍子
{
byte b1 = reader.ReadByte(); // 分子
byte b2 = reader.ReadByte(); // 分母(2のマイナス乗)
byte b3 = reader.ReadByte(); // 1拍当たりのMIDIクロック数
byte b4 = reader.ReadByte(); // 四分音符の中に入る32分の音符数
if (b3 != 0x18 || b4 != 0x08)
{
throw new SMFException("対応していないMIDIファイル:拍子記号");
}
}
return null;
case 0x54:
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x08:
case 0x09:
case 0x20:
case 0x21:
case 0x59:
case 0x7f:
default:
reader.ReadBytes((int)dataSize); // 読み飛ばし
return null;
}
}
public override void Load(string filePath)
{
List <List <TrackEvent> > trackEvents = new List <List <TrackEvent> >();
BinaryReader reader = new BinaryReader(new FileStream(filePath, FileMode.Open), Encoding.UTF8);
_header = readHeader(reader);
if (!_header.DeltaTimeInPPQN)
{
throw new SMFException("対応していないMIDIファイル:TimeInSec Division");
}
if (_header.FormatType == 2)
{
throw new SMFException("対応していないMIDIファイル:Format");
}
for (int i = 0; i < _header.TrackNum; i++)
{
List <TrackEvent> evs = new List <TrackEvent>();
readTrack(reader, ref evs);
trackEvents.Add(evs);
}
double maxPitch = double.MinValue;
double minPitch = double.MaxValue;
long prevTick = 0;
double time = 0;
int tempo = 500000;
double ppqnInv = 1 / (double)_header.DeltaTime;
Dictionary <int, Dictionary <int, SMFNote> > channels = new Dictionary <int, Dictionary <int, SMFNote> >();
_points = new List <MusicNote>();
while (true)
{
if (trackEvents.Count == 0)
{
break;
}
if (trackEvents.TrueForAll((lst) => { return(lst.Count == 0); }))
{
break;
}
int idx = -1; long minTick = long.MaxValue;
for (int i = 0; i < trackEvents.Count; i++)
{
if (trackEvents[i].Count == 0)
{
continue;
}
long tick = trackEvents[i][0].AbsoluteTick;
if (tick < minTick)
{
idx = i; minTick = tick;
}
}
if (idx < 0)
{
break;
}
TrackEvent fstev = trackEvents[idx][0];
trackEvents[idx].RemoveAt(0);
time += (fstev.AbsoluteTick - prevTick) * tempo * ppqnInv / 1000000.0;
switch (fstev.EventType)
{
case EventType.Tempo:
tempo = (int)fstev.Params[0];
break;
case EventType.NoteOn:
{
int channel = (int)fstev.Params[0];
int noteNum = (int)fstev.Params[1];
Dictionary <int, SMFNote> noteNums;
if (channels.ContainsKey(channel))
{
noteNums = channels[channel];
}
else
{
noteNums = new Dictionary <int, SMFNote>();
channels.Add(channel, noteNums);
}
SMFNote note;
if (noteNums.ContainsKey(noteNum))
{
note = noteNums[noteNum];
MusicNote n = new MusicNote();
n.TimeInSec = time;
n.Pitch = note.Pitch;
n.Start = false;
_points.Add(n);
}
note = new SMFNote(true, pitchFromNote(noteNum));
if (noteNums.ContainsKey(noteNum))
{
noteNums[noteNum] = note;
}
else
{
noteNums.Add(noteNum, note);
}
MusicNote nn = new MusicNote();
nn.TimeInSec = time;
nn.Pitch = note.Pitch;
nn.Start = true;
_points.Add(nn);
if (note.Pitch < minPitch)
{
minPitch = note.Pitch;
}
if (note.Pitch > maxPitch)
{
maxPitch = note.Pitch;
}
}
break;
case EventType.NoteOff:
{
int channel = (int)fstev.Params[0];
int noteNum = (int)fstev.Params[1];
Dictionary <int, SMFNote> noteNums;
if (channels.ContainsKey(channel))
{
noteNums = channels[channel];
}
else
{
noteNums = new Dictionary <int, SMFNote>();
channels.Add(channel, noteNums);
}
SMFNote note;
if (noteNums.ContainsKey(noteNum))
{
note = noteNums[noteNum];
MusicNote n = new MusicNote();
n.TimeInSec = time;
n.Pitch = note.Pitch;
n.Start = false;
_points.Add(n);
if (note.Pitch < minPitch)
{
minPitch = note.Pitch;
}
if (note.Pitch > maxPitch)
{
maxPitch = note.Pitch;
}
noteNums.Remove(noteNum);
}
}
break;
}
prevTick = fstev.AbsoluteTick;
}
_length = time;
ToneResult minTone = ToneAnalyzer.Analyze(minPitch, 1.0);
ToneResult maxTone = ToneAnalyzer.Analyze(maxPitch, 1.0);
maxTone.ToneIdx++;
if (maxTone.ToneIdx >= 12)
{
maxTone.ToneIdx -= 12; maxTone.Octave++;
}
minTone.ToneIdx--;
if (minTone.ToneIdx <= 0)
{
minTone.ToneIdx += 12; minTone.Octave--;
}
MinPitch = ToneAnalyzer.PitchFromTone(minTone.ToneIdx, minTone.Octave);
MaxPitch = ToneAnalyzer.PitchFromTone(maxTone.ToneIdx, maxTone.Octave);
_points.Sort((MusicNote n1, MusicNote n2) =>
{
if (n1.TimeInSec != n2.TimeInSec)
{
return(n1.TimeInSec.CompareTo(n2.TimeInSec));
}
if (n1.Start)
{
if (n2.Start)
{
return(0);
}
return(1);
}
else
{
if (n2.Start)
{
return(-1);
}
return(0);
}
});
}
private TrackEvent readMidiEvent(byte statusByte, byte prevStatusByte, BinaryReader reader, out uint readDataSize)
{
readDataSize = 2;
byte param1 = 0;
byte param2 = 0;
bool runningStatus = (statusByte & 0x80) == 0;
if (runningStatus)
{
param1 = statusByte;
statusByte = prevStatusByte;
readDataSize--;
}
else
{
param1 = reader.ReadByte();
}
int channel = (statusByte & 0x0f);
switch (statusByte >> 4)
{
case 0x8: // SMFNote Off
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int velocity = param2 & 0x7f;
TrackEvent ev = new TrackEvent();
ev.EventType = EventType.NoteOff;
ev.Params = new object[] { channel, noteNum, velocity };
return ev;
}
case 0x9: // SMFNote On
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int velocity = param2 & 0x7f;
TrackEvent ev = new TrackEvent();
ev.EventType = velocity == 0 ? EventType.NoteOff : EventType.NoteOn;
ev.Params = new object[] { channel, noteNum, velocity };
return ev;
}
case 0xa: // Polyphonic Key Pressure (Aftertouch)
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int amount = param2 & 0x7f;
}
break;
case 0xb: // Control Change
{
param2 = reader.ReadByte();
readDataSize++;
int noteNum = param1 & 0x7f;
int amount = param2 & 0x7f;
}
break;
case 0xc: // Program Change
{
int programNum = param1 & 0x7f;
}
break;
case 0xd: // Channel Pressure (After-touch)
{
int amount = param1 & 0x7f;
}
break;
case 0xe: // Pitch Wheel Change
{
param2 = reader.ReadByte();
readDataSize++;
int value = param1 + param2 << 7;
}
break;
}
return null;
}