public SoundFontSampleData(IReadable input)
{
var id = input.Read8BitChars(4);
var size = input.ReadInt32LE();
if (id.ToLower() != "list")
throw new Exception("Invalid soundfont. Could not find sdta LIST chunk.");
var readTo = input.Position + size;
id = input.Read8BitChars(4);
if (id.ToLower() != "sdta")
throw new Exception("Invalid soundfont. The LIST chunk is not of type sdta.");
BitsPerSample = 0;
byte[] rawSampleData = null;
while (input.Position < readTo)
{
var subID = input.Read8BitChars(4);
size = input.ReadInt32LE();
switch (subID.ToLower())
{
case "smpl":
BitsPerSample = 16;
rawSampleData = input.ReadByteArray(size);
break;
case "sm24":
if (rawSampleData == null || size != Math.Ceiling(SampleData.Length / 2.0))
{//ignore this chunk if wrong size or if it comes first
input.Skip(size);
}
else
{
BitsPerSample = 24;
for (var x = 0; x < SampleData.Length; x++)
{
var b = new byte[3];
b[0] = (byte)input.ReadByte();
b[1] = rawSampleData[2 * x];
b[2] = rawSampleData[2 * x + 1];
}
}
if (size % 2 == 1)
{
if (input.ReadByte() != 0)
{
input.Position--;
}
}
break;
default:
throw new Exception("Invalid soundfont. Unknown chunk id: " + subID + ".");
}
}
if (BitsPerSample == 16)
{
SampleData = rawSampleData;
}
else if (BitsPerSample != 24)
throw new Exception("Only 16 and 24 bit samples are supported.");
}
public SoundFontSampleData(IReadable input)
{
var id = input.Read8BitChars(4);
var size = input.ReadInt32LE();
if (id.ToLower() != "list")
{
throw new Exception("Invalid soundfont. Could not find sdta LIST chunk.");
}
var readTo = input.Position + size;
id = input.Read8BitChars(4);
if (id.ToLower() != "sdta")
{
throw new Exception("Invalid soundfont. The LIST chunk is not of type sdta.");
}
BitsPerSample = 0;
byte[] rawSampleData = null;
while (input.Position < readTo)
{
var subID = input.Read8BitChars(4);
size = input.ReadInt32LE();
switch (subID.ToLower())
{
case "smpl":
BitsPerSample = 16;
rawSampleData = input.ReadByteArray(size);
break;
case "sm24":
if (rawSampleData == null || size != Math.Ceiling(SampleData.Length / 2.0))
{ //ignore this chunk if wrong size or if it comes first
input.Skip(size);
}
else
{
BitsPerSample = 24;
for (var x = 0; x < SampleData.Length; x++)
{
var b = new byte[3];
b[0] = (byte)input.ReadByte();
b[1] = rawSampleData[2 * x];
b[2] = rawSampleData[2 * x + 1];
}
}
if (size % 2 == 1)
{
if (input.ReadByte() != 0)
{
input.Position--;
}
}
break;
default:
throw new Exception("Invalid soundfont. Unknown chunk id: " + subID + ".");
}
}
if (BitsPerSample == 16)
{
SampleData = rawSampleData;
}
else if (BitsPerSample != 24)
{
throw new Exception("Only 16 and 24 bit samples are supported.");
}
}
private static MidiEvent ReadMetaMessage(IReadable input, int delta, byte status)
{
var metaStatus = input.ReadByte();
switch ((MetaEventTypeEnum)metaStatus)
{
case MetaEventTypeEnum.SequenceNumber:
{
var count = input.ReadByte();
if (count == 0)
{
return(new MetaNumberEvent(delta, status, (byte)metaStatus, -1));
}
else if (count == 2)
{
return(new MetaNumberEvent(delta, status, (byte)metaStatus, input.ReadInt16BE()));
}
else
{
throw new Exception("Invalid sequence number event.");
}
}
case MetaEventTypeEnum.TextEvent:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.CopyrightNotice:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.SequenceOrTrackName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.InstrumentName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.LyricText:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.MarkerText:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.CuePoint:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.PatchName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.PortName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.MidiChannel:
if (input.ReadByte() != 1)
{
throw new Exception("Invalid midi channel event. Expected size of 1.");
}
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.MidiPort:
if (input.ReadByte() != 1)
{
throw new Exception("Invalid midi port event. Expected size of 1.");
}
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.EndOfTrack:
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.Tempo:
if (input.ReadByte() != 3)
{
throw new Exception("Invalid tempo event. Expected size of 3.");
}
return(new MetaNumberEvent(delta, status, (byte)metaStatus, (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte()));
case MetaEventTypeEnum.SmpteOffset:
if (input.ReadByte() != 5)
{
throw new Exception("Invalid smpte event. Expected size of 5.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.TimeSignature:
if (input.ReadByte() != 4)
{
throw new Exception("Invalid time signature event. Expected size of 4.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.KeySignature:
if (input.ReadByte() != 2)
{
throw new Exception("Invalid key signature event. Expected size of 2.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.SequencerSpecific:
var length = ReadVariableLength(input);
var data = input.ReadByteArray(length);
return(new MetaDataEvent(delta, status, (byte)metaStatus, data));
}
throw new Exception("Not a valid meta message Status: " + status + " Meta: " + metaStatus);
}
private static MidiEvent ReadMetaMessage(IReadable input, int delta, byte status)
{
var metaStatus = input.ReadByte();
switch ((MetaEventTypeEnum)metaStatus)
{
case MetaEventTypeEnum.SequenceNumber:
{
var count = input.ReadByte();
if (count == 0)
return new MetaNumberEvent(delta, status, (byte)metaStatus, -1);
else if (count == 2)
{
return new MetaNumberEvent(delta, status, (byte)metaStatus, input.ReadInt16BE());
}
else
throw new Exception("Invalid sequence number event.");
}
case MetaEventTypeEnum.TextEvent:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.CopyrightNotice:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.SequenceOrTrackName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.InstrumentName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.LyricText:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.MarkerText:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.CuePoint:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.PatchName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.PortName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.MidiChannel:
if (input.ReadByte() != 1)
throw new Exception("Invalid midi channel event. Expected size of 1.");
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.MidiPort:
if (input.ReadByte() != 1)
throw new Exception("Invalid midi port event. Expected size of 1.");
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.EndOfTrack:
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.Tempo:
if (input.ReadByte() != 3)
throw new Exception("Invalid tempo event. Expected size of 3.");
return new MetaNumberEvent(delta, status, (byte)metaStatus, (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte());
case MetaEventTypeEnum.SmpteOffset:
if (input.ReadByte() != 5)
throw new Exception("Invalid smpte event. Expected size of 5.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.TimeSignature:
if (input.ReadByte() != 4)
throw new Exception("Invalid time signature event. Expected size of 4.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.KeySignature:
if (input.ReadByte() != 2)
throw new Exception("Invalid key signature event. Expected size of 2.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.SequencerSpecific:
var length = ReadVariableLength(input);
var data = input.ReadByteArray(length);
return new MetaDataEvent(delta, status, (byte)metaStatus, data);
}
throw new Exception("Not a valid meta message Status: " + status + " Meta: " + metaStatus);
}
