private InstrumentRegion(Instrument instrument, Generator[] global, Generator[] local, SampleHeader[] samples)
{
gs = new short[61];
gs[(int)GeneratorType.InitialFilterCutoffFrequency] = 13500;
gs[(int)GeneratorType.DelayModulationLfo] = -12000;
gs[(int)GeneratorType.DelayVibratoLfo] = -12000;
gs[(int)GeneratorType.DelayModulationEnvelope] = -12000;
gs[(int)GeneratorType.AttackModulationEnvelope] = -12000;
gs[(int)GeneratorType.HoldModulationEnvelope] = -12000;
gs[(int)GeneratorType.DecayModulationEnvelope] = -12000;
gs[(int)GeneratorType.ReleaseModulationEnvelope] = -12000;
gs[(int)GeneratorType.DelayVolumeEnvelope] = -12000;
gs[(int)GeneratorType.AttackVolumeEnvelope] = -12000;
gs[(int)GeneratorType.HoldVolumeEnvelope] = -12000;
gs[(int)GeneratorType.DecayVolumeEnvelope] = -12000;
gs[(int)GeneratorType.ReleaseVolumeEnvelope] = -12000;
gs[(int)GeneratorType.KeyRange] = 0x7F00;
gs[(int)GeneratorType.VelocityRange] = 0x7F00;
gs[(int)GeneratorType.KeyNumber] = -1;
gs[(int)GeneratorType.Velocity] = -1;
gs[(int)GeneratorType.ScaleTuning] = 100;
gs[(int)GeneratorType.OverridingRootKey] = -1;
if (global != null)
{
foreach (var parameter in global)
{
SetParameter(parameter);
}
}
if (local != null)
{
foreach (var parameter in local)
{
SetParameter(parameter);
}
}
if (samples != null)
{
var id = gs[(int)GeneratorType.SampleID];
if (!(0 <= id && id < samples.Length))
{
throw new InvalidDataException($"The instrument '{instrument.Name}' contains an invalid sample ID '{id}'.");
}
sample = samples[id];
}
else
{
sample = SampleHeader.Default;
}
}
internal static SampleHeader[] ReadFromChunk(BinaryReader reader, int size)
{
if (size % 46 != 0)
{
throw new InvalidDataException("The sample header list is invalid.");
}
var headers = new SampleHeader[size / 46 - 1];
for (var i = 0; i < headers.Length; i++)
{
headers[i] = new SampleHeader(reader);
}
// The last one is the terminator.
new SampleHeader(reader);
return(headers);
}
internal SoundFontParameters(BinaryReader reader)
{
var chunkId = reader.ReadFourCC();
if (chunkId != "LIST")
{
throw new InvalidDataException("The LIST chunk was not found.");
}
var end = reader.BaseStream.Position + reader.ReadInt32();
var listType = reader.ReadFourCC();
if (listType != "pdta")
{
throw new InvalidDataException($"The type of the LIST chunk must be 'pdta', but was '{listType}'.");
}
PresetInfo[] presetInfos = null;
ZoneInfo[] presetBag = null;
Generator[] presetGenerators = null;
InstrumentInfo[] instrumentInfos = null;
ZoneInfo[] instrumentBag = null;
Generator[] instrumentGenerators = null;
while (reader.BaseStream.Position < end)
{
var id = reader.ReadFourCC();
var size = reader.ReadInt32();
switch (id)
{
case "phdr":
presetInfos = PresetInfo.ReadFromChunk(reader, size);
break;
case "pbag":
presetBag = ZoneInfo.ReadFromChunk(reader, size);
break;
case "pmod":
Modulator.DiscardData(reader, size);
break;
case "pgen":
presetGenerators = Generator.ReadFromChunk(reader, size);
break;
case "inst":
instrumentInfos = InstrumentInfo.ReadFromChunk(reader, size);
break;
case "ibag":
instrumentBag = ZoneInfo.ReadFromChunk(reader, size);
break;
case "imod":
Modulator.DiscardData(reader, size);
break;
case "igen":
instrumentGenerators = Generator.ReadFromChunk(reader, size);
break;
case "shdr":
sampleHeaders = SampleHeader.ReadFromChunk(reader, size);
break;
default:
throw new InvalidDataException($"The INFO list contains an unknown ID '{id}'.");
}
}
if (presetInfos == null)
{
throw new InvalidDataException("The PHDR sub-chunk was not found.");
}
if (presetBag == null)
{
throw new InvalidDataException("The PBAG sub-chunk was not found.");
}
if (presetGenerators == null)
{
throw new InvalidDataException("The PGEN sub-chunk was not found.");
}
if (instrumentInfos == null)
{
throw new InvalidDataException("The INST sub-chunk was not found.");
}
if (instrumentBag == null)
{
throw new InvalidDataException("The IBAG sub-chunk was not found.");
}
if (instrumentGenerators == null)
{
throw new InvalidDataException("The IGEN sub-chunk was not found.");
}
if (sampleHeaders == null)
{
throw new InvalidDataException("The SHDR sub-chunk was not found.");
}
var instrumentZones = Zone.Create(instrumentBag, instrumentGenerators);
instruments = Instrument.Create(instrumentInfos, instrumentZones, sampleHeaders);
var presetZones = Zone.Create(presetBag, presetGenerators);
presets = Preset.Create(presetInfos, presetZones, instruments);
}