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]]);
}
}
