VorbisInfoFloor UnpackFloor0(OggBitStream input)
{
var info = new VorbisInfoFloor();
int order = input.ReadBits(8);
int rate = input.ReadBits(16);
int barkmap = input.ReadBits(16);
int ampbits = input.ReadBits(6);
int ampdB = input.ReadBits(8);
int numbooks = input.ReadBits(4) + 1;
if (order < 1 || rate < 1 || barkmap < 1 || numbooks < 1)
{
return(null);
}
for (int j = 0; j < numbooks; ++j)
{
int books = input.ReadByte();
if (books < 0 || books >= CodecSetup.Books)
{
return(null);
}
}
return(info);
}
VorbisInfoMapping UnpackMapping(OggBitStream input)
{
var info = new VorbisInfoMapping();
int b = input.ReadBits(1);
if (b < 0)
{
return(null);
}
if (b > 0)
{
info.submaps = input.ReadBits(4) + 1;
if (info.submaps <= 0)
{
return(null);
}
}
else
{
info.submaps = 1;
}
b = input.ReadBits(1);
if (b < 0)
{
return(null);
}
if (b > 0)
{
info.coupling_steps = input.ReadBits(8) + 1;
if (info.coupling_steps <= 0)
{
return(null);
}
for (int i = 0; i < info.coupling_steps; ++i)
{
int bits = CountBits((uint)Channels);
int testM = input.ReadBits(bits);
int testA = input.ReadBits(bits);
if (testM < 0 || testA < 0 || testM == testA ||
testM >= Channels || testA >= Channels)
{
return(null);
}
}
}
if (input.ReadBits(2) != 0)
{
return(null);
}
if (info.submaps > 1)
{
for (int i = 0; i < Channels; ++i)
{
int chmuxlist = input.ReadBits(4);
if (chmuxlist >= info.submaps || chmuxlist < 0)
{
return(null);
}
}
}
for (int i = 0; i < info.submaps; ++i)
{
input.ReadByte(); // time submap unused
int floorsubmap = input.ReadByte();
if (floorsubmap >= CodecSetup.Floors || floorsubmap < 0)
{
return(null);
}
int residuesubmap = input.ReadByte();
if (residuesubmap >= CodecSetup.Residues || residuesubmap < 0)
{
return(null);
}
}
return(info);
}