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 static int FromInt32(Endianness endianness, byte[] str, int offset)
{
switch (endianness)
{
case Endianness.LittleEndian:
return(BitConv.FromInt32(str, offset));
case Endianness.BigEndian:
return(BEBitConv.FromInt32(str, offset));
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));
}