public ToyMP3Frame()
{
// initialize
CRC_check = 0;
for(int i = 0; i < 2; i++)
{
for(int j = 0; j < 2; j++)
{
granule[i,j] = new GranuleInfo();
}
}
}
private void DecodeScalefactor(GranuleInfo granule, int ch, int gr)
{
int Slen1 = granule.Slen[0];
int Slen2 = granule.Slen[1];
// Mixed Block
if(granule.IsMixedBlock)
{
for(int sfb=0; sfb<8; sfb++)
{
Scf[ch,gr].LongBlock[sfb]=bs.GetByInt(Slen1);
}
for(int sfb=3; sfb<6; sfb++)
{
for(int w=0; w<3; w++)
{
Scf[ch,gr].ShortBlock[w,sfb] = bs.GetByInt(Slen1);
}
}
for(int sfb=6; sfb<12; sfb++)
{
for(int w=0; w<3; w++)
{
Scf[ch,gr].ShortBlock[w,sfb] = bs.GetByInt(Slen2);
}
}
}
// Short Block
else if(granule.IsShortBlock)
{
for(int sfb=0; sfb<6; sfb++)
{
for(int w=0; w<3; w++)
{
Scf[ch,gr].ShortBlock[w,sfb] = bs.GetByInt(Slen1);
}
}
for(int sfb=6; sfb<12; sfb++)
{
for(int w=0; w<3; w++)
{
Scf[ch,gr].ShortBlock[w,sfb] = bs.GetByInt(Slen2);
}
}
}
// Long Block
else if(granule.IsLongBlock)
{
// In case granule0,
// without exception, data should be taken from bitstream.
if(gr == 0)
{
for(int sfb=0; sfb<11; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = bs.GetByInt(Slen1);
}
for(int sfb=11; sfb<21; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = bs.GetByInt(Slen2);
}
}
else
{
// When processing granule1 and SCFSI is 1,
// sdalefactor will shared with granule0.
// Else, scalefactor should be got from bitstream.
if(frame.GetScfsi(ch,0) == 1)
{
for(int sfb=0; sfb<6; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = Scf[ch,0].LongBlock[sfb];
}
}
else
{
for(int sfb=0; sfb<6; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = bs.GetByInt(Slen1);
}
}
if(frame.GetScfsi(ch,1) == 1)
{
for(int sfb=6; sfb<11; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = Scf[ch,0].LongBlock[sfb];
}
}
else
{
for(int sfb=6; sfb<11; sfb++)
{
Scf[ch, gr].LongBlock[sfb] = bs.GetByInt(Slen1);
}
}
if(frame.GetScfsi(ch,2) == 1)
{
for(int sfb=11; sfb<16; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = Scf[ch,0].LongBlock[sfb];
}
}
else
{
for(int sfb=11; sfb<16; sfb++)
{
Scf[ch, gr].LongBlock[sfb] = bs.GetByInt(Slen2);
}
}
if(frame.GetScfsi(ch, 3) == 1)
{
for(int sfb=16; sfb<21; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = Scf[ch, 0].LongBlock[sfb];
}
}
else
{
for(int sfb=16; sfb<21; sfb++)
{
Scf[ch,gr].LongBlock[sfb] = bs.GetByInt(Slen2);
}
}
}
}
}
