//---------------------------------------------------------------------------
bool File_DolbyE::Descramble_20bit ()
{
int32u ScrambleMask;
Get_S3 (20, ScrambleMask, "Scramble mask");
int16u Size=((BigEndian2int16u(Buffer+Buffer_Offset+(size_t)Element_Size-Data_BS_Remain()/8)^(ScrambleMask>>4))>>2)&0x3FF;
if (Data_BS_Remain()<(size_t)((Size+1)*BitDepth)) //+1 for additional unknown word
return false; //There is a problem
int8u* Temp=Descrambled_Buffer+(size_t)Element_Size-Data_BS_Remain()/8;
int64u ScrambleMasks=(((int64u)ScrambleMask)<<20)|ScrambleMask;
bool Half;
if (Data_BS_Remain()%8)
{
Temp--;
int24u2BigEndian(Temp, BigEndian2int24u(Temp)^(ScrambleMask));
Half=true;
}
else
Half=false;
for (int16u Pos=0; Pos<Size-(Half?1:0); Pos+=2)
int40u2BigEndian(Temp+(Half?3:0)+Pos*5/2, BigEndian2int40u(Temp+(Half?3:0)+Pos*5/2)^ScrambleMasks);
if ((Size-((Size && Half)?1:0))%2==0)
int24u2BigEndian(Temp+(Half?3:0)+(Size-((Size && Half)?1:0))*5/2, BigEndian2int24u(Temp+(Half?3:0)+(Size-((Size && Half)?1:0))*5/2)^(((int32u)ScrambleMasks)<<4));
return true;
}
//---------------------------------------------------------------------------
bool File_Vc3::FileHeader_Begin()
{
//Element_Size
if (Buffer_Size<5)
return false; //Must wait for more data
if (BigEndian2int40u(Buffer)!=0x0000028001LL)
{
Reject("VC-3");
return false;
}
//All should be OK...
return true;
}
