sdrangel/plugins/channeltx/moddatv/dvb-s2/dvbs2_interleave.cpp

#include "memory.h"
#include "DVBS2.h"
//
// The output is bit packed ready for modulating
//
void DVBS2::s2_interleave( void )
{
    int index=0;
    int rows=0;

    int frame_size = m_format[0].nldpc;

    if( m_format[0].constellation == M_QPSK )
    {
        rows = frame_size/2;
        m_payload_symbols =  rows;
        for( int i = 0; i < rows; i++ )
        {
            m_iframe[i]  = (m_frame[index++]<<1);
            m_iframe[i] |= m_frame[index++];
        }
        return;
    }

    if( m_format[0].constellation == M_8PSK )
    {
        if( m_format[0].code_rate == CR_3_5 )
        {
            rows = frame_size/3;
            m_payload_symbols =  rows;
            Bit *c1,*c2,*c3;
            c1 = &m_frame[rows*2];
            c2 = &m_frame[rows];
            c3 = &m_frame[0];
            for( int i = 0; i < rows; i++ )
            {
                m_iframe[i]  = (c1[i]<<2) | (c2[i]<<1) | (c3[i]);
            }
        }
        else
        {
            rows = frame_size/3;
            m_payload_symbols =  rows;
            Bit *c1,*c2,*c3;
            c1 = &m_frame[0];
            c2 = &m_frame[rows];
            c3 = &m_frame[rows*2];
            for( int i = 0; i < rows; i++ )
            {
                m_iframe[i]  = (c1[i]<<2) | (c2[i]<<1) | (c3[i]);
            }
        }
        return;
    }

    if( m_format[0].constellation == M_16APSK )
    {
        rows = frame_size/4;
        m_payload_symbols =  rows;
        Bit *c1,*c2,*c3,*c4;
        c1 = &m_frame[0];
        c2 = &m_frame[rows];
        c3 = &m_frame[rows*2];
        c4 = &m_frame[rows*3];
        for( int i = 0; i < rows; i++ )
        {
            m_iframe[i]  = (c1[i]<<3) | (c2[i]<<2) | (c3[i]<<1) | (c4[i]);
        }
        return;
    }

    if( m_format[0].constellation == M_32APSK )
    {
        rows = frame_size/5;
        m_payload_symbols =  rows;
        Bit *c1,*c2,*c3,*c4,*c5;
        c1 = &m_frame[0];
        c2 = &m_frame[rows];
        c3 = &m_frame[rows*2];
        c4 = &m_frame[rows*3];
        c5 = &m_frame[rows*4];
        for( int i = 0; i < rows; i++ )
        {
            m_iframe[i]  = (c1[i]<<4) | (c2[i]<<3) | (c3[i]<<2) | (c4[i]<<1) | c5[i];
        }

        return;
    }
}