public static MidiFileAsset Load(byte [] data)
{
var reader = new MidiDataStreamReader(data);;
// Chunk type
if (reader.ReadChars(4) != "MThd")
{
throw new FormatException("Can't find header chunk.");
}
// Chunk length
if (reader.ReadBEUInt32() != 6u)
{
throw new FormatException("Length of header chunk must be 6.");
}
// Format (unused)
reader.Advance(2);
// Number of tracks
var trackCount = reader.ReadBEUInt16();
// Ticks per quarter note
var tpqn = reader.ReadBEUInt16();
if ((tpqn & 0x8000u) != 0)
{
throw new FormatException("SMPTE time code is not supported.");
}
// Tracks
var tracks = new MidiAnimationAsset [trackCount];
for (var i = 0; i < trackCount; i++)
{
tracks[i] = ReadTrack(reader, tpqn);
}
// Asset instantiation
var asset = ScriptableObject.CreateInstance <MidiFileAsset>();
asset.tracks = tracks;
return(asset);
}
static MidiAnimationAsset ReadTrack(MidiDataStreamReader reader, uint tpqn)
{
// Chunk type
if (reader.ReadChars(4) != "MTrk")
{
throw new FormatException("Can't find track chunk.");
}
// Chunk length
var chunkEnd = reader.ReadBEUInt32();
chunkEnd += reader.Position;
// MIDI event sequence
var events = new List <MidiEvent>();
var ticks = 0u;
var stat = (byte)0;
while (reader.Position < chunkEnd)
{
// Delta time
ticks += reader.ReadMultiByteValue();
// Status byte
if ((reader.PeekByte() & 0x80u) != 0)
{
stat = reader.ReadByte();
}
if (stat == 0xffu)//255,FFのこと
{
// 0xff: Meta event (unused) メタイベントにテンポ情報とか入っている
//reader.Advance(1);//オリジナルのスクリプト：メタデータの種類
var meta = reader.ReadByte();
if (meta == 0x51u)
{
var dataLengh = reader.ReadMultiByteValue(); //データ長の情報。ここでは03が入るはず。（テンポの情報は３バイトであらわされる）
var data = reader.ReadBEUInt24(); //テンポのデータ。単位は[ms/qn]。通常表記のテンポ[qn/min]に直すには、逆数に60000000をかければ良い。
var tmp = Math.Round(60000000 / (float)data);
//出力するとき、MidiEventのインスタンスで返すが、小数の情報が落ちてしまうのでRoundにしておく。複雑なテンポはないと仮定する。
events.Add(new MidiEvent
{
time = ticks,
status = stat,
data1 = meta,
data2 = (byte)tmp
});
Debug.Log(ticks + ":: Tempo info:" + stat + ", " + meta + ", " + dataLengh + ", " + tmp);
}
else
{
reader.Advance(reader.ReadMultiByteValue());//reader.ReadMultiByteValue()で続くデータ長さを取得。その分Advanceで送っている。
}
}
else if (stat == 0xf0u)
{
// 0xf0: SysEx (unused)
while (reader.ReadByte() != 0xf7u)
{
}
}
else
{
// MIDI event
var b1 = reader.ReadByte();
var b2 = (stat & 0xe0u) == 0xc0u ? (byte)0 : reader.ReadByte();
events.Add(new MidiEvent {
time = ticks, status = stat, data1 = b1, data2 = b2
});
//Debug.Log(ticks + "," + stat + "," + b1 + "," + b2);
}
}
//Debug.Log(events);
// Quantize duration with bars.
var bars = (ticks + tpqn * 4 - 1) / (tpqn * 4);
//Debug.Log(bars + "bars");
// Asset instantiation
var asset = ScriptableObject.CreateInstance <MidiAnimationAsset>();
asset.template.tempo = 120;
asset.template.duration = bars * tpqn * 4;
asset.template.ticksPerQuarterNote = tpqn;
asset.template.events = events.ToArray();
return(asset);
}
static MidiAnimationAsset ReadTrack(MidiDataStreamReader reader, uint tpqn)
{
// Chunk type
if (reader.ReadChars(4) != "MTrk")
{
throw new FormatException("Can't find track chunk.");
}
// Chunk length
var chunkEnd = reader.ReadBEUInt32();
chunkEnd += reader.Position;
// MIDI event sequence
var events = new List <MidiEvent>();
var tick = 0u;
var time = 0f;
var tempo = 120f;
var stat = (byte)0;
var ticksStr = "";
var hitPointsCnt = 0;
while (reader.Position < chunkEnd)
{
// Delta time
var delta = reader.ReadMultiByteValue();
tick += delta;
// Time with tempo
var secondsPerBeat = 60f / tempo;
var deltaSeconds = secondsPerBeat * ((float)delta / (float)tpqn);
time += deltaSeconds;
// Status byte
if ((reader.PeekByte() & 0x80u) != 0)
{
stat = reader.ReadByte();
}
if (stat == 0xffu)
{
// 0xff: Meta event
var meta = reader.ReadByte();
if (meta == 0x51u) // tempo set
{
var dataLength = reader.ReadMultiByteValue();
var data = reader.ReadBEUInt24();
var tmp = Math.Round(60000000 / (float)data);
Debug.LogFormat("tick: {0}, tempo: {1}", tick, tmp);
tempo = (float)tmp;
events.Add(new MidiEvent {
time = time,
tick = tick,
status = stat,
data1 = meta,
data2 = new byte(), // dummy
tempo = tempo
});
}
else
{
reader.Advance(reader.ReadMultiByteValue());
events.Add(new MidiEvent {
time = time,
tick = tick,
status = stat,
data1 = meta,
data2 = new byte() // dummy
});
}
}
else if (stat == 0xf0u)
{
// 0xf0: SysEx (unused)
while (reader.ReadByte() != 0xf7u)
{
}
events.Add(new MidiEvent {
time = time,
tick = tick,
status = stat,
data1 = new byte(), // dummy
data2 = new byte() // dummy
});
}
else
{
// MIDI event
var b1 = reader.ReadByte();
var b2 = (stat & 0xe0u) == 0xc0u ? (byte)0 : reader.ReadByte();
if (!Contains(events, tick, stat))
{
events.Add(new MidiEvent {
time = time, tick = tick, status = stat, data1 = b1, data2 = b2
});
if ((stat & 0xf0) == 0x90)
{
Debug.LogFormat("tick: {0}, time: {1}, frame: {2}, note: {3}", (float)tick, time, Math.Round(time * 60), b1);
ticksStr += tick + "\n";
if (b1 == 0x26 || b1 == 0x23)
{
hitPointsCnt++;
}
}
}
}
}
// Debug.Log(ticksStr);
Debug.LogFormat("HitPoints {0}", hitPointsCnt);
// Quantize duration with bars.
var bars = (tick + tpqn * 4 - 1) / (tpqn * 4);
// Asset instantiation
var asset = ScriptableObject.CreateInstance <MidiAnimationAsset>();
asset.template.tempo = 120;
asset.template.duration = bars * tpqn * 4;
asset.template.ticksPerQuarterNote = tpqn;
asset.template.events = events.ToArray();
return(asset);
}
static MidiAnimationAsset ReadTrack(MidiDataStreamReader reader, uint tpqn)
{
// Chunk type
if (reader.ReadChars(4) != "MTrk")
{
throw new FormatException("Can't find track chunk.");
}
// Chunk length
var chunkEnd = reader.ReadBEUInt32();
chunkEnd += reader.Position;
// MIDI event sequence
var events = new List <MidiEvent>();
var ticks = 0u;
var stat = (byte)0;
while (reader.Position < chunkEnd)
{
// Delta time
ticks += reader.ReadMultiByteValue();
// Status byte
if ((reader.PeekByte() & 0x80u) != 0)
{
stat = reader.ReadByte();
}
if (stat == 0xffu)
{
// 0xff: Meta event (unused)
reader.Advance(1);
reader.Advance(reader.ReadMultiByteValue());
}
else if (stat == 0xf0u)
{
// 0xf0: SysEx (unused)
while (reader.ReadByte() != 0xf7u)
{
}
}
else
{
// MIDI event
var b1 = reader.ReadByte();
var b2 = (stat & 0xe0u) == 0xc0u ? (byte)0 : reader.ReadByte();
events.Add(new MidiEvent {
time = ticks, status = stat, data1 = b1, data2 = b2
});
}
}
// Quantize duration with bars.
var bars = (ticks + tpqn * 4 - 1) / (tpqn * 4);
// Asset instantiation
var asset = ScriptableObject.CreateInstance <MidiAnimationAsset>();
asset.template.tempo = 120;
asset.template.duration = bars * tpqn * 4;
asset.template.ticksPerQuarterNote = tpqn;
asset.template.events = events.ToArray();
return(asset);
}
