public Instrument CreateFromFile(Project project, string filename)
{
var bytes = System.IO.File.ReadAllBytes(filename);
if (!bytes.Skip(0).Take(3).SequenceEqual(Encoding.ASCII.GetBytes("FTI")))
{
Log.LogMessage(LogSeverity.Error, "Incompatible file.");
return(null);
}
if (!bytes.Skip(3).Take(3).SequenceEqual(Encoding.ASCII.GetBytes("2.4")))
{
Log.LogMessage(LogSeverity.Error, "Incompatible FTI version.");
return(null);
}
var instType = InstrumentTypeLookup[bytes[6]];
// Needs to match the current expansion audio. Our enum happens to match (-1) for now.
if (instType != ExpansionType.None && !project.UsesExpansionAudio(instType))
{
Log.LogMessage(LogSeverity.Error, "Audio expansion is not enabled in the current project.");
return(null);
}
var offset = 7;
var nameLen = BitConverter.ToInt32(bytes, offset); offset += 4;
var name = Encoding.ASCII.GetString(bytes, offset, nameLen); offset += nameLen;
if (project.GetInstrument(name) != null)
{
Log.LogMessage(LogSeverity.Error, $"An instrument named '{name}' already exists.");
return(null);
}
var instrument = project.CreateInstrument(instType, name);
if (instType == ExpansionType.Fds)
{
var wavEnv = instrument.Envelopes[EnvelopeType.FdsWaveform];
for (int i = 0; i < wavEnv.Length; i++)
{
wavEnv.Values[i] = (sbyte)bytes[offset++];
}
var modEnv = instrument.Envelopes[EnvelopeType.FdsModulation];
for (int i = 0; i < modEnv.Length; i++)
{
modEnv.Values[i] = (sbyte)bytes[offset++];
}
instrument.FdsWavePreset = WavePresetType.Custom;
instrument.FdsModPreset = WavePresetType.Custom;
modEnv.ConvertFdsModulationToAbsolute();
// Skip mod speed/depth/delay.
offset += sizeof(int) * 3;
ReadEnvelope(bytes, ref offset, instrument, EnvelopeType.Volume);
ReadEnvelope(bytes, ref offset, instrument, EnvelopeType.Arpeggio);
ReadEnvelope(bytes, ref offset, instrument, EnvelopeType.Pitch);
}
else if (instType == ExpansionType.None ||
instType == ExpansionType.N163)
{
var seqCount = bytes[offset++];
// Envelopes
for (int i = 0; i < seqCount; i++)
{
if (bytes[offset++] == 1)
{
ReadEnvelope(bytes, ref offset, instrument, EnvelopeTypeLookup[i]);
}
}
}
else if (instType == ExpansionType.Vrc7)
{
instrument.Vrc7Patch = (byte)BitConverter.ToInt32(bytes, offset); offset += 4;
if (instrument.Vrc7Patch == 0)
{
for (int i = 0; i < 8; ++i)
{
instrument.Vrc7PatchRegs[i] = bytes[offset++];
}
}
}
if (instType == ExpansionType.N163)
{
int waveSize = BitConverter.ToInt32(bytes, offset); offset += 4;
int wavePos = BitConverter.ToInt32(bytes, offset); offset += 4;
int waveCount = BitConverter.ToInt32(bytes, offset); offset += 4;
instrument.N163WavePreset = WavePresetType.Custom;
instrument.N163WaveSize = (byte)waveSize;
instrument.N163WavePos = (byte)wavePos;
var wavEnv = instrument.Envelopes[EnvelopeType.N163Waveform];
// Only read the first wave for now.
for (int j = 0; j < waveSize; j++)
{
wavEnv.Values[j] = (sbyte)bytes[offset++];
}
if (waveCount > 1)
{
Log.LogMessage(LogSeverity.Warning, $"Multiple N163 waveforms detected, only loading the first one.");
}
}
// Samples
if (instType == ExpansionType.None)
{
// Skip over the sample mappings for now, we will load them after the actual sample data.
var assignedCount = BitConverter.ToInt32(bytes, offset); offset += 4;
var mappingOffset = offset;
offset += assignedCount * 4;
var sampleCount = BitConverter.ToInt32(bytes, offset); offset += 4;
var sampleMap = new DPCMSample[MAX_DSAMPLES];
for (int i = 0; i < sampleCount; i++)
{
var sampleIdx = BitConverter.ToInt32(bytes, offset); offset += 4;
var sampleNameLen = BitConverter.ToInt32(bytes, offset); offset += 4;
var sampleName = Encoding.ASCII.GetString(bytes, offset, sampleNameLen); offset += sampleNameLen;
var sampleSize = BitConverter.ToInt32(bytes, offset); offset += 4;
var sampleData = new byte[sampleSize];
Array.Copy(bytes, offset, sampleData, 0, sampleSize); offset += sampleSize;
sampleMap[sampleIdx] = project.CreateDPCMSampleFromDmcData(sampleName, sampleData);
}
for (int i = 0; i < assignedCount; i++)
{
byte idx = bytes[mappingOffset++];
byte sample = bytes[mappingOffset++];
byte pitch = bytes[mappingOffset++];
byte delta = bytes[mappingOffset++];
if (project.NoteSupportsDPCM(idx + 1))
{
project.MapDPCMSample(idx + 1, sampleMap[sample - 1], pitch & 0x0f, (pitch & 0x80) != 0);
}
}
}
project.SortInstruments();
return(instrument);
}
