/* ***** BEGIN LICENSE BLOCK *****
*
* $Id: subband_byteio.cpp,v 1.3 2007/11/16 04:48:44 asuraparaju Exp $ $Name: Dirac_0_9_1 $
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The Original Code is BBC Research and Development code.
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* The Initial Developer of the Original Code is the British Broadcasting
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* Contributor(s): Andrew Kennedy
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#include <libdirac_byteio/subband_byteio.h>

using namespace dirac;
using namespace std;

SubbandByteIO::SubbandByteIO(Subband& sub_band,
                             const ByteIO& byteio):
ByteIO(byteio),
m_subband(sub_band),
m_band_data_length(0)
{
   
}

SubbandByteIO::SubbandByteIO(Subband& sub_band):
ByteIO(),
m_subband(sub_band),
m_band_data_length(0)
{
   
}

SubbandByteIO::~SubbandByteIO()
{

}

//--------------public----------------------------------------------

bool SubbandByteIO::Input()
{
    // read length of Arith-coded data block
    m_band_data_length = ReadUint();

    // set skip flag if no data
    m_subband.SetSkip(m_band_data_length==0 ? true : false);

    // check for zero-length sub-band
    if(m_subband.Skipped())
    {
        ByteAlignInput();
        return true;
    }

     // If we're not skipped, we need a quantisation index for the subband
    m_subband.SetQIndex(ReadUint() );

    if ( !m_subband.UsingMultiQuants() )
    {
        // Propogate the quantiser index to all the code blocks if we 
        // don't have multiquants
        for ( int j=0 ; j<m_subband.GetCodeBlocks().LengthY() ; ++j )
            for ( int i=0 ; i<m_subband.GetCodeBlocks().LengthX() ; ++i )
           m_subband.GetCodeBlocks()[j][i].SetQIndex( m_subband.QIndex() );
    }

    // byte align
    ByteAlignInput();
    //int f=mp_stream->tellg();

    return true;
}

int SubbandByteIO::GetBandDataLength() const 
{
    return m_band_data_length;
}

const string SubbandByteIO::GetBytes() 
{
    ByteIO byte_io;

    ByteAlignOutput();

    // output size
    byte_io.WriteUint(GetSize());

    // check for zero-length sub-band
    if(GetSize()==0)
    {
        byte_io.ByteAlignOutput();
        return byte_io.GetBytes();
    }

    // output quantisation
    byte_io.WriteUint(m_subband.QIndex());

    // byte align
    byte_io.ByteAlignOutput();

    //std::cerr << "Subband hdr size=" << byte_io.GetSize();
    //std::cerr << " Arithdata size=" << this->GetSize()<< std::endl;

    return byte_io.GetBytes()+ByteIO::GetBytes();
}



//-------------private-------------------------------------------------------
 
