private void ReadSubframe()
{
uint zeroPadding = bitReader.ReadBits(1);
if (zeroPadding != 0)
{
throw new FlacException("Subframe zero padding is not zero");
}
int subframeType = (int)bitReader.ReadBits(6);
SubframeType type;
int order = 0;
if (subframeType == FlacCommons.ConstantSubframeType)
{
type = SubframeType.SubframeConstant;
}
else if (subframeType == FlacCommons.VerbatimSubframeType)
{
type = SubframeType.SubframeVerbatim;
}
else if (FlacCommons.FixedSubframeTypeStart <= subframeType &&
subframeType <= FlacCommons.FixedSubframeTypeEnd)
{
type = SubframeType.SubframeFixed;
order = subframeType - FlacCommons.FixedSubframeTypeStart;
}
else if (subframeType >= FlacCommons.LpcSubframeTypeStart)
{
type = SubframeType.SubframeLpc;
order = subframeType - FlacCommons.LpcSubframeTypeStart + 1;
}
else
{
throw new FlacException("Subframe type is set to reserved");
}
uint wastedBitsPerSampleFlag = bitReader.ReadBits(1);
if (wastedBitsPerSampleFlag > 0)
{
this.wastedBitsPerSample = 1 + (int)bitReader.ReadUnary();
}
else
{
this.wastedBitsPerSample = 0;
}
this.subframeType = type;
int subframeBitsPerSample = FrameBitsPerSample;
if (ChannelAssignment[subframeIndex] == SoundChannelAssignment.Difference)
{
subframeBitsPerSample++; // undocumented
}
switch (type)
{
case SubframeType.SubframeConstant:
PrepareConstantSubframe(subframeBitsPerSample);
break;
case SubframeType.SubframeVerbatim:
PrepareVerbatimSubframe(subframeBitsPerSample);
break;
case SubframeType.SubframeLpc:
PrepareLpcSubframe(order, subframeBitsPerSample);
break;
case SubframeType.SubframeFixed:
PrepareFixedSubframe(order, subframeBitsPerSample);
break;
}
this.recordType = FlacRecordType.Subframe;
this.dataRead = false;
}
