public MOD(Data.Buffer data)
{
data.SetEndianess(Endian.Endianess.Big);
Log.Info.Write(ErrorSystemType.Data, $"Loading MOD song: {System.Text.Encoding.ASCII.GetString(data.Pop(20).ReinterpretAsArray(20))}"); // songname
// add dummy sample 0
samples.Add(new Sample());
for (int i = 1; i < 32; ++i) // samples 1-31
{
Log.Info.Write(ErrorSystemType.Data, $"Sample {i} name: {System.Text.Encoding.ASCII.GetString(data.Pop(22).ReinterpretAsArray(22))}"); // samplename
samples.Add(new Sample()
{
Length = data.Pop <UInt16>() * 2,
FineTune = ConvertFineTune(data.Pop <byte>() & 0xf),
Volume = data.Pop <byte>(), // 0-64, change in dB = 20*log10(Volume/64)
RepeatPointOffset = data.Pop <UInt16>() * 2,
RepeatLength = Math.Max(0, data.Pop <UInt16>() - 1) * 2
});
}
int songLength = data.Pop <byte>();
if (songLength < 1 || songLength > 128)
{
throw new ExceptionAudio("Invalid MOD format.");
}
data.Skip(1);
byte[] songPatterns = data.Pop(128).ReinterpretAsArray(128);
var magic = data.Pop(4).ToString();
if (magic != "M!K!" && magic != "M.K.")
{
throw new ExceptionAudio("Invalid or unsupported MOD format.");
}
int numPatterns = songPatterns.Max() + 1;
List <Pattern> patterns = new List <Pattern>(numPatterns);
for (int i = 0; i < numPatterns; ++i)
{
var pattern = new Pattern();
for (int div = 0; div < 64; ++div)
{
for (int chan = 0; chan < 4; ++chan)
{
pattern.AddNote(chan, new Note(data));
}
}
patterns.Add(pattern);
}
for (int i = 0; i < samples.Count; ++i)
{
if (samples[i].Length > 0)
{
data.Skip(2); // ignore tracker word
samples[i].Length -= 2;
uint length = (uint)samples[i].Length;
if (length > 0)
{
samples[i].SetData(data.Pop(length).ReinterpretAsArray(length));
}
}
}
for (int i = 0; i < songLength; ++i)
{
song.Add(patterns[songPatterns[i]]);
}
}
public XMI(Data.Buffer data)
{
// Note: Chunk length and so on are encoded as big endian.
// But as we don't use them we use little endian because
// the XMI data is encoded in little endian.
data.SetEndianess(Endian.Endianess.Little);
// Form chunk
if (data.ToString(4) != "FORM")
{
return;
}
data.Pop(4); // FORM
data.Pop <uint>(); // FORM chunk length
// format XDIR
if (data.ToString(4) != "XDIR")
{
return;
}
data.Pop(4); // XDIR
if (data.ToString(4) != "INFO")
{
return;
}
data.Pop(4); // INFO
data.Pop <uint>(); // INFO chunk length
int numTracks = data.Pop <ushort>();
if (numTracks != 1)
{
return; // we only support one track per file
}
if (data.ToString(4) != "CAT ")
{
return;
}
data.Pop(4); // CAT_
data.Pop <uint>(); // CAT chunk length
// format XMID
if (data.ToString(4) != "XMID")
{
return;
}
data.Pop(4); // XMID
// load the one track
// Form chunk
if (data.ToString(4) != "FORM")
{
return;
}
data.Pop(4); // FORM
data.Pop <uint>(); // FORM chunk length
// format XMID
if (data.ToString(4) != "XMID")
{
return;
}
data.Pop(4); // XMID
// TIMB chunk
if (data.ToString(4) != "TIMB")
{
return;
}
data.Pop(4); // TIMB
data.Pop <uint>(); // TIMB chunk length
int count = data.Pop <ushort>();
for (int j = 0; j < count; ++j)
{
// we don't need the TIMB information, just skip it
data.Pop(2);
}
// EVNT chunk
if (data.ToString(4) != "EVNT")
{
return;
}
data.Pop(4); // EVNT
data.Pop <uint>(); // EVNT chunk length
// read xmi/midi events
while (data.Readable())
{
ParseEvent(data);
}
var eventIndices = new Dictionary <Event, int>();
for (int i = 0; i < events.Count; ++i)
{
eventIndices.Add(events[i], i);
}
events.Sort((a, b) =>
{
int result = a.StartTime.CompareTo(b.StartTime);
if (result == 0)
{
return(eventIndices[a].CompareTo(eventIndices[b]));
}
return(result);
});
}