mirror of
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232 lines
6.3 KiB
C++
232 lines
6.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2021-2022 Jon Beniston, M7RCE <jon@beniston.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////
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#ifndef DVB2_H
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#define DVB2_H
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#include <queue>
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#include <deque>
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#include <list>
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#include <stdio.h>
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typedef unsigned int u32;
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typedef unsigned char u8;
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// BB HEADER fileds
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#define TS_GS_TRANSPORT 3
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#define TS_GS_GENERIC_PACKETIZED 0
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#define TS_GS_GENERIC_CONTINUOUS 1
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#define TS_GS_RESERVED 2
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#define SIS_MIS_SINGLE 1
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#define SIS_MIS_MULTIPLE 0
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#define CCM 1
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#define ACM 0
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#define ISSYI_ACTIVE 1
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#define ISSYI_NOT_ACTIVE 0
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#define NPD_ACTIVE 1
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#define NPD_NOT_ACTIVE 0
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// Rolloff
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#define RO_0_35 0
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#define RO_0_25 1
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#define RO_0_20 2
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#define RO_RESERVED 3
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// Pilots
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#define PILOTS_OFF 0
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#define PILOTS_ON 1
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typedef struct{
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int ts_gs;
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int sis_mis;
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int ccm_acm;
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int issyi;
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int npd;
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int ro;
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int isi;
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int upl;
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int dfl;
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int sync;
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int syncd;
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}BBHeader;
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typedef int Bit;
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// The number of useable and stuff bits in a frame
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typedef struct{
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int data_bits;
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int stuff_bits;
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}FrameBits;
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#define FRAME_SIZE_NORMAL 64800
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#define FRAME_SIZE_SHORT 16200
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#define LDPC_ENCODE_TABLE_LENGTH (FRAME_SIZE_NORMAL*10)
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typedef struct{
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int table_length;
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Bit d[LDPC_ENCODE_TABLE_LENGTH];
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Bit p[LDPC_ENCODE_TABLE_LENGTH];
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}Ldpc_encode_table;
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#define FRAME_NORMAL 0x00
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#define FRAME_SHORT 0x10
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#define BB_HEADER_LENGTH_BITS 72
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#define CRC8_LENGTH_BITS 8
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#define PADDING_LENGTH 200
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// Code rates
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#define CR_1_4 0
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#define CR_1_3 1
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#define CR_2_5 2
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#define CR_1_2 3
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#define CR_3_5 4
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#define CR_2_3 5
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#define CR_3_4 6
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#define CR_4_5 7
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#define CR_5_6 8
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#define CR_8_9 9
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#define CR_9_10 10
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// BCH Code
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#define BCH_CODE_N8 0
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#define BCH_CODE_N10 1
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#define BCH_CODE_N12 2
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#define BCH_CODE_S12 3
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// Constellation
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#define M_QPSK 0
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#define M_8PSK 1
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#define M_16APSK 2
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#define M_32APSK 3
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//Interface
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#define M_ACM 0
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#define M_CCM 1
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#define M_VCM 2
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typedef struct{
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int frame_type;
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int code_rate;
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int roll_off;
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int constellation;
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int pilots;
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int dummy_frame;
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int null_deletion;
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int intface;
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int broadcasting;
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// Calculated information, not used by caller
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BBHeader bb_header;
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int kldpc;
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int kbch;
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int nldpc;
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int q_val;
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int bch_code;
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int useable_data_bits;
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int padding_bits;
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int total_bits;
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int nr_tps;
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int nr_tps_bits;
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}DVB2FrameFormat;
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class DVB2{
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public:
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protected:
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Bit m_frame[FRAME_SIZE_NORMAL];
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DVB2FrameFormat m_format[2];
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Bit m_padding[PADDING_LENGTH];
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int m_frame_offset_bits;
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int m_params_changed;
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private:
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int m_bbheader[BB_HEADER_LENGTH_BITS+CRC8_LENGTH_BITS];
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int m_bb_randomise[FRAME_SIZE_NORMAL];
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u32 m_poly_n_8[4];
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u32 m_poly_n_10[5];
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u32 m_poly_n_12[6];
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u32 m_poly_s_12[6];
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u8 m_crc_tab[256];
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u8 m_dnp; // Deleted null packet
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// Transport packet queue
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std::queue <u8> m_tp_q;
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// LDPC tables
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const static int ldpc_tab_1_4N[45][13];
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const static int ldpc_tab_1_3N[60][13];
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const static int ldpc_tab_2_5N[72][13];
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const static int ldpc_tab_1_2N[90][9];
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const static int ldpc_tab_3_5N[108][13];
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const static int ldpc_tab_2_3N[120][14];
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const static int ldpc_tab_3_4N[135][13];
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const static int ldpc_tab_4_5N[144][12];
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const static int ldpc_tab_5_6N[150][14];
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const static int ldpc_tab_8_9N[160][5];
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const static int ldpc_tab_9_10N[162][5];
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const static int ldpc_tab_1_4S[9][13];
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const static int ldpc_tab_1_3S[15][13];
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const static int ldpc_tab_2_5S[18][13];
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const static int ldpc_tab_1_2S[20][9];
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const static int ldpc_tab_3_5S[27][13];
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const static int ldpc_tab_2_3S[30][14];
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const static int ldpc_tab_3_4S[33][13];
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const static int ldpc_tab_4_5S[35][4];
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const static int ldpc_tab_5_6S[37][14];
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const static int ldpc_tab_8_9S[40][5];
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Ldpc_encode_table m_ldpc_encode;
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void bb_randomise(void);
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void init_scrambler(void);
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void init_bb_randomiser(void);
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void ldpc_lookup_generate(void);
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void ldpc_encode( void );
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int add_transport_packet( u8 *pkt, Bit *b );
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void build_crc8_table( void );
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u8 calc_crc8( u8 *b, int len );
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int add_crc8_bits( Bit *in, int length );
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void unpack_transport_packet_add_crc( u8 *ts );
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void add_bbheader( void );
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void poly_reverse( int *pin, int *pout, int len );
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void poly_pack( const int *pin, u32* pout, int len );
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int poly_mult( const int *ina, int lena, const int *inb, int lenb, int *out );
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void bch_poly_build_tables( void );
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void reg_4_shift( u32 *sr );
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void reg_5_shift( u32 *sr );
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void reg_6_shift( u32 *sr );
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Bit bch_n_8_encode( Bit *in, int len );
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Bit bch_n_10_encode( Bit *in, int len );
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Bit bch_n_12_encode( Bit *in, int len );
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Bit bch_s_12_encode( Bit *in, int len );
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int bch_encode( void );
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int add_ts_frame_base( u8 *ts );
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void ldpc_encode_test();
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void base_end_of_frame_actions(void);
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protected:
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int set_configure( DVB2FrameFormat *f );
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void get_configure( DVB2FrameFormat *f );
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int next_ts_frame_base( u8 *ts );
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public:
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// encode a new transport packet
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// virtual void physical(void);
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DVB2();
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~DVB2();
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};
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#endif
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