internal static InstrumentInfo[] ReadFromChunk(BinaryReader reader, int size)
{
if (size % 22 != 0)
{
throw new InvalidDataException("The instrument list is invalid.");
}
var count = size / 22;
var instruments = new InstrumentInfo[count];
for (var i = 0; i < count; i++)
{
var instrument = new InstrumentInfo();
instrument.name = reader.ReadFixedLengthString(20);
instrument.zoneStartIndex = reader.ReadUInt16();
instruments[i] = instrument;
}
for (var i = 0; i < count - 1; i++)
{
instruments[i].zoneEndIndex = instruments[i + 1].zoneStartIndex - 1;
}
return(instruments);
}
private Instrument(InstrumentInfo info, Zone[] zones, SampleHeader[] samples)
{
this.name = info.Name;
var zoneCount = info.ZoneEndIndex - info.ZoneStartIndex + 1;
if (zoneCount <= 0)
{
throw new InvalidDataException($"The instrument '{info.Name}' has no zone.");
}
var zoneSpan = zones.AsSpan(info.ZoneStartIndex, zoneCount);
regions = InstrumentRegion.Create(this, zoneSpan, samples);
}
internal SoundFontParameters(BinaryReader reader)
{
var chunkId = reader.ReadFourCC();
if (chunkId != "LIST")
{
throw new InvalidDataException("The LIST chunk was not found.");
}
var end = reader.BaseStream.Position + reader.ReadInt32();
var listType = reader.ReadFourCC();
if (listType != "pdta")
{
throw new InvalidDataException($"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);
}