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/* -*- c++ -*- */
/*
* Copyright 2018 Ron Economos.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "bbframe_ldpc.h"
#include "codings/dvb-s2/ldpc/dvb_s2_tables.hh"
#include <cstring>
namespace dvbs2
{
BBFrameLDPC::BBFrameLDPC(dvbs2_framesize_t framesize, dvbs2_code_rate_t rate)
{
if (framesize == FECFRAME_NORMAL)
{
switch (rate)
{
case C1_4:
ldpc = new LDPC<DVB_S2_TABLE_B1>();
break;
case C1_3:
ldpc = new LDPC<DVB_S2_TABLE_B2>();
break;
case C2_5:
ldpc = new LDPC<DVB_S2_TABLE_B3>();
break;
case C1_2:
ldpc = new LDPC<DVB_S2_TABLE_B4>();
break;
case C3_5:
ldpc = new LDPC<DVB_S2_TABLE_B5>();
break;
case C2_3:
ldpc = new LDPC<DVB_S2_TABLE_B6>();
break;
case C3_4:
ldpc = new LDPC<DVB_S2_TABLE_B7>();
break;
case C4_5:
ldpc = new LDPC<DVB_S2_TABLE_B8>();
break;
case C5_6:
ldpc = new LDPC<DVB_S2_TABLE_B9>();
break;
case C8_9:
ldpc = new LDPC<DVB_S2_TABLE_B10>();
break;
case C9_10:
ldpc = new LDPC<DVB_S2_TABLE_B11>();
break;
default:
break;
}
}
else if (framesize == FECFRAME_SHORT)
{
switch (rate)
{
case C1_4:
ldpc = new LDPC<DVB_S2_TABLE_C1>();
break;
case C1_3:
ldpc = new LDPC<DVB_S2_TABLE_C2>();
break;
case C2_5:
ldpc = new LDPC<DVB_S2_TABLE_C3>();
break;
case C1_2:
ldpc = new LDPC<DVB_S2_TABLE_C4>();
break;
case C3_5:
ldpc = new LDPC<DVB_S2_TABLE_C5>();
break;
case C2_3:
ldpc = new LDPC<DVB_S2_TABLE_C6>();
break;
case C3_4:
ldpc = new LDPC<DVB_S2_TABLE_C7>();
break;
case C4_5:
ldpc = new LDPC<DVB_S2_TABLE_C8>();
break;
case C5_6:
ldpc = new LDPC<DVB_S2_TABLE_C9>();
break;
case C8_9:
ldpc = new LDPC<DVB_S2_TABLE_C10>();
break;
default:
break;
}
}
decoder.init(ldpc);
encoder.init(ldpc);
aligned_buffer = new simd_type[68400];
}
BBFrameLDPC::~BBFrameLDPC()
{
delete ldpc;
}
int BBFrameLDPC::decode(int8_t *frame, int max_trials)
{
int trials = decoder((void *)aligned_buffer, (code_type *)frame, max_trials);
if (trials < 0)
return trials;
else
return max_trials - trials;
}
void BBFrameLDPC::encode(uint8_t *frame)
{
int8_t *soft_buffer = new int8_t[ldpc->code_len()];
// Convert to soft
for (int i = 0; i < ldpc->data_len(); i++)
soft_buffer[i] = ((frame[i / 8] >> (7 - (i % 8))) & 1) ? 127 : -127;
encoder(soft_buffer, &soft_buffer[ldpc->data_len()]);
// Repack to bytes
memset(&frame[ldpc->data_len() / 8], 0, (ldpc->code_len() - ldpc->data_len()) / 8);
for (int i = 0; i < (ldpc->code_len() - ldpc->data_len()); i++)
frame[(ldpc->data_len() / 8) + i / 8] = frame[(ldpc->data_len() / 8) + i / 8] << 1 | (soft_buffer[ldpc->data_len() + i] < 0);
delete[] soft_buffer;
}
}
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