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/* hacktv - Analogue video transmitter for the HackRF */
/*=======================================================================*/
/* Copyright 2018 Philip Heron <phil@sanslogic.co.uk> */
/* */
/* This program 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 of the License, or */
/* (at your option) any later version. */
/* */
/* This program 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 program. If not, see <http://www.gnu.org/licenses/>. */
/* -=== D/D2-MAC encoder ===- */
#ifndef _MAC_H
#define _MAC_H
#define MAC_CLOCK_RATE 20250000
#define MAC_WIDTH 1296
#define MAC_LINES 625
/* The two data modes */
#define MAC_MODE_D 0
#define MAC_MODE_D2 1
/* MAC VSAM modes */
#define MAC_VSAM_DOUBLE_CUT (0 << 0)
#define MAC_VSAM_UNSCRAMBLED (1 << 0)
#define MAC_VSAM_SINGLE_CUT (2 << 0)
#define MAC_VSAM_FREE_ACCESS (0 << 2)
#define MAC_VSAM_CONTROLLED_ACCESS (1 << 2)
#define MAC_VSAM_FREE_ACCESS_DOUBLE_CUT 0 /* 000: free access, double-cut component rotation scrambling */
#define MAC_VSAM_FREE_ACCESS_UNSCRAMBLED 1 /* 001: free access, unscrambled */
#define MAC_VSAM_FREE_ACCESS_SINGLE_CUT 2 /* 010: free access, single-cut line rotation scrambling */
#define MAC_VSAM_CONTROLLED_ACCESS_DOUBLE_CUT 4 /* 100: controlled access, double-cut component rotation scrambling */
#define MAC_VSAM_CONTROLLED_ACCESS_SINGLE_CUT 6 /* 110: controlled access, single-cut line rotation scrambling */
/* Video aspect ratios */
#define MAC_RATIO_4_3 0
#define MAC_RATIO_16_9 1
/* Number of bits and bytes in a packet, bytes rounded up */
#define MAC_PACKET_BITS 751
#define MAC_PACKET_BYTES 94
/* Number of bits and bytes in a packet payload */
#define MAC_PAYLOAD_BITS 728
#define MAC_PAYLOAD_BYTES 91
/* Number of packets in the transmit queue */
#define MAC_QUEUE_LEN 12
/* Maximum number of bytes per line (for D-MAC, D2 is half) */
#define MAC_LINE_BYTES (MAC_WIDTH / 8)
/* Audio defines */
#define MAC_MEDIUM_QUALITY 0
#define MAC_HIGH_QUALITY 1
#define MAC_MONO 0
#define MAC_STEREO 1
#define MAC_COMPANDED 0
#define MAC_LINEAR 1
#define MAC_FIRST_LEVEL_PROTECTION 0
#define MAC_SECOND_LEVEL_PROTECTION 1
/* CA PRBS defines */
#define MAC_PRBS_CW_FA (((uint64_t) 1 << 60) - 1)
#define MAC_PRBS_CW_MASK (((uint64_t) 1 << 60) - 1)
#define MAC_PRBS_SR1_MASK (((uint32_t) 1 << 31) - 1)
#define MAC_PRBS_SR2_MASK (((uint32_t) 1 << 29) - 1)
#define MAC_PRBS_SR3_MASK (((uint32_t) 1 << 31) - 1)
#define MAC_PRBS_SR4_MASK (((uint32_t) 1 << 29) - 1)
#define MAC_PRBS_SR5_MASK (((uint32_t) 1 << 61) - 1)
#include "eurocrypt.h"
typedef struct {
uint8_t pkt[MAC_PAYLOAD_BYTES];
int address;
int continuity;
int scramble; /* 0 = Don't scramble, 1 = Scramble */
} _mac_packet_queue_item_t;
typedef struct {
/* The packet queue */
_mac_packet_queue_item_t pkts[MAC_QUEUE_LEN]; /* Copy of the packets */
int len; /* Number of packets in the queue */
int p; /* Index of the next free slot */
} mac_packet_queue_t;
typedef struct {
mac_packet_queue_t queue; /* Packet queue for this subframe */
uint8_t pkt[MAC_PACKET_BYTES]; /* The current packet */
int pkt_bits; /* Bits sent of the current packet */
/* Channel continuity counters */
int service_continuity; /* Channel 0 -- Service information */
int audio_continuity; /* Channel 224 -- Audio packets */
int dummy_continuity; /* Channel 1023 -- Dummy packets */
} mac_subframe_t;
typedef struct {
uint8_t vsam; /* VSAM Vision scrambling and access mode */
uint8_t ratio; /* 0: 4:3, 1: 16:9 */
uint16_t audio_channel;
int scramble_audio;
/* 1 = Teletext enabled */
int teletext;
/* UDT (Unified Date and Time) sequence */
uint8_t udt[25];
/* RDF sequence index */
int rdf;
/* The data subframes */
mac_subframe_t subframes[2];
/* PRBS seed, per-line */
uint16_t prbs[MAC_LINES];
/* Duobinary state */
int polarity;
int16_t *lut;
int width;
/* NICAM encoder */
nicam_enc_t nicam;
/* Video properties */
int chrominance_width;
int chrominance_left;
int white_ref_left;
int black_ref_left;
int black_ref_right;
/* PRBS generators */
uint64_t cw;
uint64_t sr1;
uint64_t sr2;
uint64_t sr3;
uint64_t sr4;
int video_scale[MAC_WIDTH];
/* Eurocrypt state */
int eurocrypt;
eurocrypt_t ec;
} mac_t;
extern void mac_golay_encode(uint8_t *data, int blocks);
extern int mac_init(vid_t *s);
extern void mac_free(vid_t *s);
extern int mac_write_packet(vid_t *s, int subframe, int address, int continuity, const uint8_t *data, int scramble);
extern int mac_write_audio(vid_t *s, const int16_t *audio);
extern int mac_next_line(vid_t *s, void *arg, int nlines, vid_line_t **lines);
#endif
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