public byte[] ToMIDI()
{
RIFF riff = new RIFF("MIDI");
byte[] mthd = new byte [6];
BEBitConv.ToInt16(mthd, 0, 0);
BEBitConv.ToInt16(mthd, 2, 1);
BEBitConv.ToInt16(mthd, 4, resolution);
riff.Items.Add(new RIFFData("MThd", mthd));
byte[] mtrk = new byte [15 + data.Length];
mtrk[0] = 0;
mtrk[1] = 0xFF;
mtrk[2] = 0x51;
mtrk[3] = 0x03;
MIDIConv.To3BE(mtrk, 4, tempo);
mtrk[7] = 0;
mtrk[8] = 0xFF;
mtrk[9] = 0x58;
mtrk[10] = 0x04;
BEBitConv.ToInt16(mtrk, 11, rhythm);
mtrk[13] = 0x18;
mtrk[14] = 0x08;
data.CopyTo(mtrk, 15);
riff.Items.Add(new RIFFData("MTrk", mtrk));
return(riff.SaveBody(Endianness.BigEndian));
}
public byte[] Save()
{
int length = 6;
foreach (SEQ seq in seqs)
{
length += 13;
length += seq.Data.Length;
}
byte[] data = new byte [length];
BEBitConv.ToInt32(data, 0, Magic);
BEBitConv.ToInt16(data, 4, Version);
int offset = 6;
for (int i = 0; i < seqs.Count; i++)
{
SEQ seq = seqs[i];
BEBitConv.ToInt16(data, offset, (short)i);
BEBitConv.ToInt16(data, offset + 2, seq.Resolution);
MIDIConv.To3BE(data, offset + 4, seq.Tempo);
BEBitConv.ToInt16(data, offset + 7, seq.Rhythm);
BEBitConv.ToInt32(data, offset + 9, seq.Data.Length);
offset += 13;
seq.Data.CopyTo(data, offset);
offset += seq.Data.Length;
}
return(data);
}
public static SEQ Load(byte[] data)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
// All SEP/SEQ stuff is big-endian, like MIDI
if (data.Length < 15)
{
ErrorManager.SignalError("SEQ: Data is too short");
}
int magic = BEBitConv.FromInt32(data, 0);
int version = BEBitConv.FromInt32(data, 4);
if (magic != Magic)
{
ErrorManager.SignalIgnorableError("SEQ: Magic number is wrong");
}
if (version != Version)
{
ErrorManager.SignalIgnorableError("SEQ: Version number is wrong");
}
short resolution = BEBitConv.FromInt16(data, 8);
int tempo = MIDIConv.From3BE(data, 10);
short rhythm = BEBitConv.FromInt16(data, 13);
byte[] scoredata = new byte [data.Length - 15];
Array.Copy(data, 15, scoredata, 0, scoredata.Length);
return(new SEQ(resolution, tempo, rhythm, scoredata));
}
public byte[] Save()
{
byte[] result = new byte [15 + data.Length];
BEBitConv.ToInt32(result, 0, Magic);
BEBitConv.ToInt32(result, 4, Version);
BEBitConv.ToInt16(result, 8, resolution);
MIDIConv.To3BE(result, 10, tempo);
BEBitConv.ToInt16(result, 13, rhythm);
data.CopyTo(result, 15);
return(result);
}
public static short FromInt16(Endianness endianness, byte[] str, int offset)
{
switch (endianness)
{
case Endianness.LittleEndian:
return(BitConv.FromInt16(str, offset));
case Endianness.BigEndian:
return(BEBitConv.FromInt16(str, offset));
default:
throw new ArgumentException("Endianness is invalid.");
}
}
public static void ToInt32(Endianness endianness, byte[] str, int offset, int value)
{
switch (endianness)
{
case Endianness.LittleEndian:
BitConv.ToInt32(str, offset, value);
break;
case Endianness.BigEndian:
BEBitConv.ToInt32(str, offset, value);
break;
default:
throw new ArgumentException("Endianness is invalid.");
}
}
public static SEP Load(byte[] data, int seqcount)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (seqcount < 0)
{
throw new ArgumentOutOfRangeException("seqcount");
}
// All SEP/SEQ stuff is big-endian, like MIDI
if (data.Length < 6)
{
ErrorManager.SignalError("SEP: Data is too short");
}
int magic = BEBitConv.FromInt32(data, 0);
short version = BEBitConv.FromInt16(data, 4);
if (magic != Magic)
{
ErrorManager.SignalIgnorableError("SEP: Magic number is wrong");
}
if (version != Version)
{
ErrorManager.SignalIgnorableError("SEP: Version number is wrong");
}
int offset = 6;
SEQ[] seqs = new SEQ [seqcount];
for (int i = 0; i < seqcount; i++)
{
if (data.Length < offset + 13)
{
ErrorManager.SignalError("SEP: Data is too short");
}
short seqid = BEBitConv.FromInt16(data, offset);
short resolution = BEBitConv.FromInt16(data, offset + 2);
// tempo is 3 (yes, three) bytes
int tempo = MIDIConv.From3BE(data, offset + 4);
short rhythm = BEBitConv.FromInt16(data, offset + 7);
int length = BEBitConv.FromInt32(data, offset + 9);
if (seqid != i)
{
ErrorManager.SignalIgnorableError("SEP: Track number is wrong");
}
if (length < 0)
{
ErrorManager.SignalError("SEP: Track length is negative");
}
offset += 13;
if (data.Length < offset + length)
{
ErrorManager.SignalError("SEP: Data is too short");
}
byte[] seqdata = new byte [length];
Array.Copy(data, offset, seqdata, 0, length);
seqs[i] = new SEQ(resolution, tempo, rhythm, seqdata);
offset += length;
}
return(new SEP(seqs));
}
