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https://github.com/f4exb/sdrangel.git
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157 lines
4.0 KiB
C++
157 lines
4.0 KiB
C++
#include "memory.h"
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#include "DVBS2.h"
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//
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// called at the end of a frame
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//
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void DVBS2::end_of_frame_actions(void)
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{
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if( m_s2_config_updated )
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{
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modulator_configuration();
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m_s2_config_updated = 0;
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}
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}
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int DVBS2::is_valid( int mod, int coderate )
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{
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if( mod == M_QPSK )
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{
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if(coderate == CR_1_4) return 0;
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if(coderate == CR_1_3) return 0;
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if(coderate == CR_2_5) return 0;
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if(coderate == CR_1_2) return 0;
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if(coderate == CR_3_5) return 0;
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if(coderate == CR_2_3) return 0;
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if(coderate == CR_3_4) return 0;
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if(coderate == CR_4_5) return 0;
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if(coderate == CR_5_6) return 0;
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if(coderate == CR_8_9) return 0;
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if(coderate == CR_9_10) return 0;
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}
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if( mod == M_8PSK )
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{
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if(coderate == CR_3_5) return 0;
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if(coderate == CR_2_3) return 0;
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if(coderate == CR_3_4) return 0;
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if(coderate == CR_5_6) return 0;
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if(coderate == CR_8_9) return 0;
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if(coderate == CR_9_10) return 0;
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}
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if( mod == M_16APSK )
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{
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if(coderate == CR_2_3) return 0;
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if(coderate == CR_3_4) return 0;
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if(coderate == CR_4_5) return 0;
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if(coderate == CR_5_6) return 0;
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if(coderate == CR_8_9) return 0;
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if(coderate == CR_9_10) return 0;
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}
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if( mod == M_32APSK )
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{
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if(coderate == CR_3_4) return 0;
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if(coderate == CR_4_5) return 0;
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if(coderate == CR_5_6) return 0;
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if(coderate == CR_8_9) return 0;
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if(coderate == CR_9_10) return 0;
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}
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return -1;
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}
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//
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// index 0 and 1 will only be different when being reconfigured.
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// Use index 1 as this will be applied in the following transmit
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// frames
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//
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void DVBS2::calc_efficiency( void )
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{
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double p,m,a,s,b,po;
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// Calculate the number of symbols in the payload
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p = 0;a = 0; m = 0;
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if( m_format[1].frame_type == FRAME_NORMAL ) p = (double)FRAME_SIZE_NORMAL;
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if( m_format[1].frame_type == FRAME_SHORT ) p = (double)FRAME_SIZE_SHORT;
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if( m_format[1].constellation == M_QPSK ) m = 2.0;
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if( m_format[1].constellation == M_8PSK ) m = 3.0;
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if( m_format[1].constellation == M_16APSK ) m = 4.0;
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if( m_format[1].constellation == M_32APSK ) m = 5.0;
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s = p/m;//Number of symbols per frame
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// PL header overhead
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if( m_format[1].pilots )
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{
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po = (s/(90*16))-1;// 1 pilot every 16 blocks (of 90 symbols)
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po = po*36; // No pilot at the end
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a = s/(90+po+s);
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}
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else
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{
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a = s/(90+s);// No pilots
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}
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// Modulation efficiency
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a = a*m;
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// Take into account pilot symbols
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// TBD
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// Now calculate the useable data as percentage of the frame
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b = ((double)m_format[1].useable_data_bits)/p;
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// Now calculate the efficiency by multiplying the
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// useable bits efficiency by the modulation efficiency
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m_efficiency = b*a;
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}
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//
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// Multiply the efficiency value by the symbol rate
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// to get the useable bitrate
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//
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double DVBS2::s2_get_efficiency( void )
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{
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return m_efficiency;
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}
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int DVBS2::s2_set_configure( DVB2FrameFormat *f )
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{
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if( is_valid( f->constellation, f->code_rate ) == 0 )
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{
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if( set_configure( f ) == 0 )
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{
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calc_efficiency();
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m_s2_config_updated = 1;
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m_configured = 1;
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return 0;
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}
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}
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return -1;
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}
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void DVBS2::s2_get_configure( DVB2FrameFormat *f )
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{
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get_configure( f );
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}
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int DVBS2::s2_add_ts_frame( u8 *ts )
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{
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int res = 0;
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if (m_configured == 0) return 0;
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// Call base class
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if( next_ts_frame_base( ts ) )
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{
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// Interleave and pack
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s2_interleave();
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// create the header
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s2_pl_header_create();
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// Add the data
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res = s2_pl_data_pack();
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// Do any updates required for the next frame
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end_of_frame_actions();
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}
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return res;
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}
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void DVBS2::physical( void )
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{
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}
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DVBS2::DVBS2()
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{
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m_configured = 0;
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modulator_configuration();
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build_symbol_scrambler_table();
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pl_build_dummy();
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}
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