public void readHeaderFromStream(Stream stream)
{
long startSamplePosition = stream.Position;
sizeInBytes = ModuleUtils.ReadDWord(stream);
loopStart = ModuleUtils.ReadDWord(stream);
loopLength = ModuleUtils.ReadDWord(stream);
byte vol = ModuleUtils.ReadByte(stream);
volume = (vol >= 64) ? 1.0f : (float)vol / 64.0f;
finetune = (sbyte)ModuleUtils.ReadSignedByte(stream);
type = ModuleUtils.ReadByte(stream);
panning = ModuleUtils.ReadByte(stream);
relativeNoteNumber = (sbyte)ModuleUtils.ReadSignedByte(stream);
packedType = ModuleUtils.ReadByte(stream);
name = ModuleUtils.ReadString0(stream, 22);
length = ((type & 0x10) != 0) ? sizeInBytes >> 1 : sizeInBytes;
loopType = (byte)(type & 0x03);
is16Bits = (type & 0x10) != 0;
loopStart = is16Bits ? loopStart >> 1 : loopStart;
loopLength = is16Bits ? loopLength >> 1 : loopLength;
loopEnd = loopStart + loopLength;
loopEnd = (loopEnd > length) ? length : loopEnd;
loopStart = (loopStart > length) ? length : loopStart;
relativeNoteNumber = 0;
//stream.Seek(startSamplePosition + 40, SeekOrigin.Begin);
}
public override void ReadSampleDataFromStream(Stream stream)
{
sampleData.Clear();
if (length > 0)
{
for (int s = 0; s < length; s++)
{
float sampleValue = ModuleUtils.ReadSignedByte(stream) * 0.0078125f; // 0.0078125f = 1/128
sampleData.Add(sampleValue * ModuleConst.SOUND_AMP);
}
}
}
// NOTE : this function load regular delta packed sample data
// TODO : need to do loading of AD = 4-bit ADPCM-compressed sample data
public void readSampleDataFromStream(Stream stream)
{
sampleData.Clear();
float ampDivider = ((type & 0x10) != 0) ? 0.000030517578125f /* 1/32768 */ : 0.0078125f /* 1/128 */;
if (length > 0)
{
float oldValue = 0;
for (uint i = 0; i < length; i++)
{
float sampleValue;
sampleValue = ((type & 0x10) != 0) ? ModuleUtils.ReadSignedWordSwap(stream) : ModuleUtils.ReadSignedByte(stream);
oldValue += sampleValue * ampDivider;
if (oldValue < -1)
{
oldValue += 2;
}
else if (oldValue > 1)
{
oldValue -= 2;
}
sampleData.Add(oldValue * ModuleConst.SOUND_AMP);
}
}
}