void CompDecompressor::Decompress(ComponentByteIO* p_component_byteio,
CoeffArray& coeff_data,
SubbandList& bands)
{
// Set up the code blocks
SetupCodeBlocks( bands );
for ( int b=bands.Length() ; b>=1 ; --b ){
// Multiple quantiser are used only if
// a. The global code_block_mode is QUANT_MULTIPLE
// and
// b. More than one code block is present in the subband.
bands(b).SetUsingMultiQuants(
m_decparams.SpatialPartition() &&
m_decparams.GetCodeBlockMode() == QUANT_MULTIPLE &&
(bands(b).GetCodeBlocks().LengthX() > 1 ||
bands(b).GetCodeBlocks().LengthY() > 1)
);
// Read the header data first
SubbandByteIO subband_byteio(bands(b), *p_component_byteio);
subband_byteio.Input();
if ( !bands(b).Skipped() ){
if (m_pparams.UsingAC()){
// A pointer to the object(s) we'll be using for coding the bands
BandCodec* bdecoder;
if ( b>=bands.Length()-3){
if ( m_psort.IsIntra() && b==bands.Length() )
bdecoder=new IntraDCBandCodec(&subband_byteio,
TOTAL_COEFF_CTXS ,bands);
else
bdecoder=new LFBandCodec(&subband_byteio ,
TOTAL_COEFF_CTXS, bands ,
b, m_psort.IsIntra());
}
else
bdecoder=new BandCodec( &subband_byteio , TOTAL_COEFF_CTXS ,
bands , b, m_psort.IsIntra());
bdecoder->Decompress(coeff_data , subband_byteio.GetBandDataLength());
delete bdecoder;
}
else{
// A pointer to the object(s) we'll be using for coding the bands
BandVLC* bdecoder;
if ( m_psort.IsIntra() && b==bands.Length() )
bdecoder=new IntraDCBandVLC(&subband_byteio, bands);
else
bdecoder=new BandVLC( &subband_byteio , bands ,
b, m_psort.IsIntra());
bdecoder->Decompress(coeff_data , subband_byteio.GetBandDataLength());
delete bdecoder;
}
}
else{
SetToVal( coeff_data , bands(b) , 0 );
}
}
}
