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.");
}
/// <summary>
/// Reads a byte as size and the string itself.
/// Additionally it is ensured the specified amount of bytes is read.
/// </summary>
/// <param name="data">the data to read from.</param>
/// <param name="length">the amount of bytes to read</param>
/// <returns></returns>
public static string GpReadStringByteLength(this IReadable data, int length)
{
var stringLength = data.ReadByte();
var s = data.GpReadString(stringLength);
if (stringLength < length)
{
data.Skip(length - stringLength);
}
return(s);
}
public static Color GpReadColor(this IReadable data, bool readAlpha = false)
{
byte r = (byte)data.ReadByte();
byte g = (byte)data.ReadByte();
byte b = (byte)data.ReadByte();
byte a = 255;
if (readAlpha)
{
a = (byte)data.ReadByte();
}
else
{
data.Skip(1);
}
return(new Color(r, g, b, a));
}
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.");
}
}
/// <summary>
/// Skips an integer (4byte) and reads a string using
/// a bytesize
/// </summary>
/// <returns></returns>
public static string GpReadStringIntUnused(this IReadable data)
{
data.Skip(4);
return(data.GpReadString(data.ReadByte()));
}
