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mac.c
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/* hacktv - Analogue video transmitter for the HackRF */
/*=======================================================================*/
/* Copyright 2018 Philip Heron <[email protected]> */
/* */
/* 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 ===- */
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "video.h"
#include "nicam728.h"
#include "mac.h"
/* MAC sync codes */
#define MAC_CLAMP 0xEAF3927FUL
#define MAC_LSW 0x0BUL
#define MAC_CRI 0x55555555UL
#define MAC_FSW 0x65AEF3153F41C246ULL
/* Polynomial for PRBS generator */
#define _PRBS_POLY 0x7FFF
/* Hamming codes */
static const uint8_t _hamming[0x10] = {
0x15, 0x02, 0x49, 0x5E, 0x64, 0x73, 0x38, 0x2F, 0xD0, 0xC7, 0x8C, 0x9B, 0xA1, 0xB6, 0xFD, 0xEA
};
/* Network origin and name */
static const char *_nwo = "hacktv";
static const char *_nwname = "hacktv";
/* Service Reference */
static const char *_sname = "hacktv"; /* Service Name (max 32 characters) */
/* RDF sequence */
typedef struct {
int tdmcid;
int fln1;
int lln1;
int fln2;
int lln2;
int fcp;
int lcp;
int links;
} _rdf_t;
static _rdf_t _rdf_d2[] = {
/* CID, FL1, LL1, FL2, LL2, FCP, LCP */
{ 0x01, 0, 622, 1023, 1023, 9, 205, 0 }, /* MPX 01 data burst (99 bits) */
{ 0x10, 22, 309, 334, 621, 235, 583, 0 }, /* CDIFF colour difference signal */
{ 0x11, 22, 309, 334, 621, 589, 1285, 0 }, /* LUM luminance signal */
{ 0x20, 0, 21, 312, 333, 229, 1292, 0 }, /* FF Fixed Format teletext */
{ 0x00, }, /* End of sequence */
};
static _rdf_t _rdf_d[] = {
/* CID, FL1, LL1, FL2, LL2, FCP, LCP */
{ 0x01, 0, 622, 1023, 1023, 6, 104, 0 }, /* MPX 01 data burst (99 bits) */
{ 0x02, 0, 622, 1023, 1023, 105, 203, 0 }, /* MPX 02 data burst (99 bits) */
{ 0x10, 22, 309, 334, 621, 235, 583, 0 }, /* CDIFF colour difference signal */
{ 0x11, 22, 309, 334, 621, 589, 1285, 0 }, /* LUM luminance signal */
{ 0x20, 0, 21, 312, 333, 229, 1292, 0 }, /* FF Fixed Format teletext */
{ 0x00, }, /* End of sequence */
};
static double _rrc(double x)
{
return(x == 0 ? 1 : sin(M_PI * x) / (M_PI * x));
}
static int16_t *_duobinary_lut(int mode, int width, double level)
{
double samples_per_symbol;
double offset;
int i, x, bits;
double err;
int ntaps, htaps;
int16_t *lut, *p;
bits = (mode == MAC_MODE_D2 ? 648 : 1296);
samples_per_symbol = (double) width / bits;
offset = (double) width / 1296 * (mode == MAC_MODE_D2 ? -3 : -1);
ntaps = (int) (samples_per_symbol * 16) | 1;
htaps = ntaps / 2;
lut = malloc(sizeof(int16_t) * ((ntaps + 1) * bits + 1));
if(!lut)
{
return(NULL);
}
p = lut;
*(p++) = ntaps;
for(i = 0; i < bits; i++)
{
/* Calculate the error */
*p = lround(offset + samples_per_symbol * i);
err = offset + samples_per_symbol * i - *p;
*(p++) -= htaps;
for(x = 0; x < ntaps; x++)
{
*(p++) = lround(_rrc((double) (x - htaps - err) / samples_per_symbol) * level);
}
}
return(lut);
}
static int _duobinary(vid_t *s, int bit)
{
if(bit)
{
return(s->mac.polarity);
}
s->mac.polarity = -s->mac.polarity;
return(0);
}
static void _render_duobinary(vid_t *s, vid_line_t **lines, uint8_t *data, int nbits)
{
const int16_t *taps;
int symbol;
int ntaps;
int x, xo;
int l;
int i;
taps = s->mac.lut;
ntaps = *(taps++);
for(i = 0; i < nbits; i++, taps += ntaps + 1)
{
/* Read the next symbol */
symbol = _duobinary(s, (data[i >> 3] >> (i & 7)) & 1);
/* 0 bits don't need to be rendered */
if(!symbol) continue;
l = 1;
xo = *taps;
if(xo < 0)
{
l = 0;
xo += s->width;
}
for(x = 1; x <= ntaps; x++, xo++)
{
int t;
if(xo >= s->width)
{
xo -= s->width;
l++;
}
t = lines[l]->output[xo * 2] + (symbol == 1 ? taps[x] : -taps[x]);
/* Don't let the duobinary signal clip */
if(t < INT16_MIN) t = INT16_MIN;
else if(t > INT16_MAX) t = INT16_MAX;
lines[l]->output[xo * 2] = t;
}
}
}
/* Pseudo-random binary sequence (PRBS) generator for spectrum shaping */
static int _prbs(uint16_t *x)
{
int b;
b = (*x ^ (*x >> 14)) & 1;
*x = (*x >> 1) | (b << 14);
return(b);
}
/* Generate IW for CA PRBS for video scrambling */
static uint64_t _prbs_generate_iw(uint64_t cw, uint8_t fcnt)
{
uint64_t iw;
/* FCNT is repeated 8 times, each time inverted */
iw = ((fcnt ^ 0xFF) << 8) | fcnt;
iw |= (iw << 16) | (iw << 32) | (iw << 48);
return((iw ^ cw) & MAC_PRBS_CW_MASK);
}
/* Reset CA PRBS */
static void _prbs1_reset(mac_t *s, uint8_t fcnt)
{
uint64_t iw = _prbs_generate_iw(s->cw, fcnt);
s->sr1 = iw & MAC_PRBS_SR3_MASK;
s->sr2 = (iw >> 31) & MAC_PRBS_SR4_MASK;
}
static void _prbs2_reset(mac_t *s, uint8_t fcnt)
{
uint64_t iw = _prbs_generate_iw(s->cw, fcnt);
s->sr3 = iw & MAC_PRBS_SR3_MASK;
s->sr4 = (iw >> 31) & MAC_PRBS_SR4_MASK;
}
/* Return first x LSBs in b in reversed order. TODO: Remove this */
static uint64_t _rev(uint64_t b, int x)
{
uint64_t r = 0;
while(x--)
{
r = (r << 1) | (b & 1);
b >>= 1;
}
return(r);
}
/* Update CA PRBS1 */
static uint64_t _prbs1_update(mac_t *s)
{
uint64_t code = 0;
int i;
for(i = 0; i < 61; i++)
{
uint32_t a, b;
/* Load the multiplexer address */
a = (_rev(s->sr2, 29) << 0) & 0x03;
a |= (_rev(s->sr1, 31) << 2) & 0x1C;
/* Load the multiplexer data */
b = (_rev(s->sr2, 29) >> 2) & 0x000000FF;
b |= (_rev(s->sr1, 31) << 5) & 0xFFFFFF00;
/* Shift into result register */
code = (code >> 1) | ((uint64_t) ((b >> a) & 1) << 60);
/* Update shift registers */
s->sr1 = (s->sr1 >> 1) ^ (s->sr1 & 1 ? 0x78810820UL : 0);
s->sr2 = (s->sr2 >> 1) ^ (s->sr2 & 1 ? 0x17121100UL : 0);
}
return(code);
}
/* Update CA PRBS2 */
static uint16_t _prbs2_update(mac_t *s)
{
uint16_t code = 0;
int i;
for(i = 0; i < 16; i++)
{
int a;
/* Load the multiplexer address */
a = _rev(s->sr4, 29) & 0x1F;
if(a == 31) a = 30;
/* Shift into result register */
code = (code >> 1) | (((_rev(s->sr3, 31) >> a) & 1) << 15);
/* Update shift registers */
s->sr3 = (s->sr3 >> 1) ^ (s->sr3 & 1 ? 0x7BB88888UL : 0);
s->sr4 = (s->sr4 >> 1) ^ (s->sr4 & 1 ? 0x17A2C100UL : 0);
}
return(code);
}
/* Pack bits into buffer LSB first */
static size_t _bits(uint8_t *data, size_t offset, uint64_t bits, size_t nbits)
{
uint8_t b;
for(; nbits; nbits--, offset++, bits >>= 1)
{
b = 1 << (offset & 7);
if(bits & 1) data[offset >> 3] |= b;
else data[offset >> 3] &= ~b;
}
return(offset);
}
/* Pack bits into buffer MSB first */
static size_t _rbits(uint8_t *data, size_t offset, uint64_t bits, size_t nbits)
{
uint64_t m = (uint64_t) 1 << (nbits - 1);
uint8_t b;
for(; nbits; nbits--, offset++, bits <<= 1)
{
b = 1 << (offset & 7);
if(bits & m) data[offset >> 3] |= b;
else data[offset >> 3] &= ~b;
}
return(offset);
}
/* Pack bits from a byte array into buffer LSB first */
static size_t _bits_buf(uint8_t *data, size_t offset, const uint8_t *src, size_t nbits)
{
for(; nbits >= 8; nbits -= 8)
{
offset = _bits(data, offset, *(src++), 8);
}
if(nbits)
{
offset = _bits(data, offset, *src, nbits);
}
return(offset);
}
/* Pack bits from a byte array into buffer LSB first, interleaved with PRNG bits */
static size_t _bits_buf_il(uint8_t *data, size_t offset, const uint8_t *src, size_t nbits, uint16_t *poly)
{
int x;
for(x = 0; x < nbits; x++)
{
_prbs(poly);
offset = _bits(data, offset, (src[x >> 3] >> (x & 7)) & 1, 1);
offset = _bits(data, offset, _prbs(poly), 1);
}
return(offset);
}
static inline uint8_t _parity(unsigned int value)
{
uint8_t p = 0;
while(value)
{
p ^= value & 1;
value >>= 1;
}
return(p);
}
/* Reversed version of the CCITT CRC */
static uint16_t _crc16(const uint8_t *data, size_t length)
{
uint16_t crc = 0x0000;
const uint16_t poly = 0x8408;
int b;
while(length--)
{
crc ^= *(data++);
for(b = 0; b < 8; b++)
{
crc = (crc & 1 ? (crc >> 1) ^ poly : crc >> 1);
}
}
return(crc);
}
/* Calculate and append bits in *data with BCH codes.
*
* data = pointer to bits, LSB first
* n = Length of final code in bits (data + BCH codes)
* k = Length of data in bits
*/
static void _bch_encode(uint8_t *data, int n, int k)
{
unsigned int code = 0x0000;
unsigned int g;
int i, b;
g = (n == 23 ? 0x0571 : 0x3BB0);
for(i = 0; i < k; i++)
{
b = (data[i >> 3] >> (i & 7)) & 1;
b = (b ^ code) & 1;
code >>= 1;
if(b) code ^= g;
}
_bits(data, k, code, n - k);
}
/* Golay(24,12) protection */
void mac_golay_encode(uint8_t *data, int blocks)
{
uint8_t p[MAC_PAYLOAD_BYTES];
uint8_t *dst = p, *src = data;
int i;
memset(p, 0, MAC_PAYLOAD_BYTES);
for(i = 0; i < blocks; i += 2)
{
dst[0] = src[0];
dst[1] = src[1] & 0x0F;
dst[2] = 0x00;
_bch_encode(dst, 23, 12);
dst[2] |= (_parity(dst[0] | (dst[1] << 8) | (dst[2] << 16)) ^ 1) << 7;
dst += 3;
dst[0] = (src[2] << 4) | (src[1] >> 4);
dst[1] = src[2] >> 4;
dst[2] = 0x00;
_bch_encode(dst, 23, 12);
dst[2] |= (_parity(dst[0] | (dst[1] << 8) | (dst[2] << 16)) ^ 1) << 7;
dst += 3;
src += 3;
}
memcpy(data, p, blocks * 3);
}
static void _update_udt(uint8_t udt[25], time_t timestamp)
{
struct tm tm;
int i, mjd;
/* Get the timezone offset */
localtime_r(×tamp, &tm);
i = tm.tm_gmtoff / 1800;
if(i < 0) i = -i | (1 << 5);
/* Calculate Modified Julian Date */
gmtime_r(×tamp, &tm);
mjd = 367.0 * (1900 + tm.tm_year)
- (int) (7.0 * (1900 + tm.tm_year + (int) ((1 + tm.tm_mon + 9.0) / 12.0)) / 4.0)
+ (int) (275.0 * (1 + tm.tm_mon) / 9.0) + tm.tm_mday - 678987.0;
/* Set the Unified Date and Time sequence */
memset(udt, 0, 25);
udt[ 0] = mjd / 10000 % 10; /* MJD digit weight 10^4 */
udt[ 1] = mjd / 1000 % 10; /* MJD digit weight 10^3 */
udt[ 2] = mjd / 100 % 10; /* MJD digit weight 10^2 */
udt[ 3] = mjd / 10 % 10; /* MJD digit weight 10^1 */
udt[ 4] = mjd / 1 % 10; /* MJD digit weight 10^0 */
udt[ 5] = tm.tm_hour / 10 % 10; /* UTC hours (tens) */
udt[ 6] = tm.tm_hour / 1 % 10; /* UTC hours (units) */
udt[ 7] = tm.tm_min / 10 % 10; /* UTC minutes (tens) */
udt[ 8] = tm.tm_min / 1 % 10; /* UTC minutes (units) */
udt[ 9] = tm.tm_sec / 10 % 10; /* UTC seconds (tens) */
udt[10] = tm.tm_sec / 1 % 10; /* UTC seconds (units) */
udt[15] = (i >> 4) & 15; /* Local Offset */
udt[16] = i & 15; /* Local Offset */
/* Apply the chain code sequence */
/* 0000101011101100011111001 */
for(i = 0; i < 25; i++)
{
udt[i] |= ((0x13E3750 >> i) & 1) << 4;
}
}
static void _interleave(uint8_t pkt[94])
{
uint8_t tmp[94];
int c, d, i;
memcpy(tmp, pkt, 94);
/* + 1 bit to ensure final byte is shifted correctly */
for(d = i = 0; i < 751 + 1; i++)
{
c = i >> 3;
pkt[d] = (pkt[d] >> 1) | (tmp[c] << 7);
tmp[c] >>= 1;
if(++d == 94) d = 0;
}
}
static void _encode_packet(uint8_t *pkt, int address, int continuity, const uint8_t *data)
{
int x;
/* Generate packet header (address and continuity, MSB first) */
x = _bits(pkt, 0, address & 0x3FF, 10);
x = _bits(pkt, x, continuity & 3, 2);
_bch_encode(pkt, 23, 12);
/* Write the packet contents, or zero */
for(x = 23; x < 751; x += 8)
{
_bits(pkt, x, data ? *(data++) : 0x00, 8);
}
/* Interleave the packet */
_interleave(pkt);
}
static void _scramble_packet(uint8_t *pkt, uint64_t iw)
{
int x;
for(x = 1; x < MAC_PAYLOAD_BYTES; x++)
{
int i;
uint8_t c = 0;
/* PRBS3 */
for(i = 0; i < 8; i++)
{
uint32_t a, b;
/* Load the multiplexer address */
a = ((_rev(iw, 61) >> 4) & 1) << 0;
a |= ((_rev(iw, 61) >> 9) & 1) << 1;
a |= ((_rev(iw, 61) >> 14) & 1) << 2;
a |= ((_rev(iw, 61) >> 19) & 1) << 3;
a |= ((_rev(iw, 61) >> 24) & 1) << 4;
/* Load the multiplexer data */
b = (_rev(iw, 61) >> 29) & 0xFFFFFFFF;
/* Shift into result */
c = (c >> 1) | (((b >> a) & 1) << 7);
/* Update shift registers */
iw = (iw >> 1) ^ (iw & 1 ? 0x163D23594C934051UL : 0);
}
pkt[x] ^= c;
}
}
/* Packet reader. Returns a dummy packet if the queue is empty */
static void _read_packet(mac_t *s, _mac_packet_queue_item_t *pkt, int subframe)
{
mac_subframe_t *sf = &s->subframes[subframe];
int x;
if(sf->queue.len == 0)
{
/* The packet queue is empty, generate a dummy packet */
pkt->address = 0x3FF;
pkt->continuity = sf->dummy_continuity++;
pkt->scramble = 0;
memset(pkt->pkt, 0, MAC_PAYLOAD_BYTES);
return;
}
x = sf->queue.p - sf->queue.len;
if(x < 0) x += MAC_QUEUE_LEN;
memcpy(pkt, &sf->queue.pkts[x], sizeof(_mac_packet_queue_item_t));
sf->queue.len--;
}
static void _create_si_dg0_packet(mac_t *s, uint8_t pkt[MAC_PAYLOAD_BYTES])
{
int x;
uint16_t b;
memset(pkt, 0, MAC_PAYLOAD_BYTES);
/* PT Packet Type */
pkt[0] = 0xF8;
/* DGH (Data Group Header) */
pkt[1] = _hamming[0]; /* TG data group type */
pkt[2] = _hamming[0]; /* C data group continuity */
pkt[3] = _hamming[15]; /* R data group repetition */
pkt[4] = _hamming[0]; /* S1 MSB number of packets carrying the data group */
pkt[5] = _hamming[1]; /* S2 LSB number of packets carrying the data group */
pkt[6] = _hamming[0]; /* F1 MSB number of data group bytes in the last packet */
pkt[7] = _hamming[0]; /* F2 LSB number of data group bytes in the last packet */
pkt[8] = _hamming[1]; /* N data group suffix indicator */
pkt[9] = 0x10; /* CI Network Command (Medium Priority) */
pkt[10] = 11; /* LI Length (bytes, everything following up until the DGS) */
x = 11;
/* Parameter NWO */
pkt[x++] = 0x10; /* PI NWO (Network Origin) */
pkt[x++] = 3 + strlen(_nwo); /* LI Length (bytes, 3 + string length) */
pkt[x++] = 0x00; /* Channel number, BCD */
pkt[x++] = 0x01; /* First and second digit of satellite orbital position, BCD */
pkt[x++] = 0x91; /* Third digit of satellite orbital position, BCD and Polarisation */
strcpy((char *) &pkt[x], _nwo); /* Network Origin string */
x += strlen(_nwo);
/* Parameter NWNAME */
pkt[x++] = 0x14; /* PI NWNAME (Network Name) */
pkt[x++] = strlen(_nwname); /* LI Length (bytes, string length) */
strcpy((char *) &pkt[x], _nwname); /* Network Name string */
x += strlen(_nwname);
/* Parameter LISTX (TV) */
pkt[x++] = 0x18; /* PI LISTX (List of index values) */
pkt[x++] = 0x04; /* LI Length (4 bytes) */
pkt[x++] = 0x01; /* TV service */
pkt[x++] = 0x01; /* Index value 1 */
b = 3 << 12; /* TV, detailed description = DG3 */
b |= 1 << 10; /* Subframe identification, TDMCID = 01 */
b |= s->audio_channel; /* Packet address of the main TV sound */
pkt[x++] = (b & 0x00FF) >> 0; /* TV config LSB */
pkt[x++] = (b & 0xFF00) >> 8; /* TV config MSB */
/* Parameter LISTX (OTA - for EMMs) */
pkt[x++] = 0x18; /* PI LISTX (List of index values) */
pkt[x++] = 0x04; /* LI Length (4 bytes) */
pkt[x++] = 0x04; /* Over-air addressing service */
pkt[x++] = 0x01; /* Index value 1 */
b = 4 << 12; /* Over-air addressing, detailed description = DG4 */
b |= 1 << 10; /* Subframe identification, TDMCID = 01 */
b |= s->ec.emm_addr; /* Packet address of EMM */
pkt[x++] = (b & 0x00FF) >> 0; /* OTA config LSB */
pkt[x++] = (b & 0xFF00) >> 8; /* OTA config MSB */
/* Update the CI command length */
pkt[10] = x - pkt[10];
/* Generate the DGS CRC */
b = _crc16(&pkt[9], pkt[10] + 2);
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
/* Update the DGH length */
x -= 1;
pkt[6] = _hamming[(x & 0xF0) >> 4];
pkt[7] = _hamming[(x & 0x0F) >> 0];
/* Test if the data is too large for a single packet */
if(x > 45 - 2)
{
fprintf(stderr, "SI DG0 packet overflow (%d/43 bytes)\n", x);
}
/* Generate the overall packet CRC (excludes PT and CRC) */
x = MAC_PAYLOAD_BYTES;
b = _crc16(&pkt[1], x - 3);
pkt[x - 2] = (b & 0x00FF) >> 0;
pkt[x - 1] = (b & 0xFF00) >> 8;
}
static void _create_si_dg3_packet(mac_t *s, uint8_t *pkt)
{
int x;
uint16_t b;
memset(pkt, 0, MAC_PAYLOAD_BYTES);
/* PT Packet Type */
pkt[0] = 0xF8;
/* DGH (Data Group Header) */
pkt[1] = _hamming[3]; /* TG data group type */
pkt[2] = _hamming[0]; /* C data group continuity */
pkt[3] = _hamming[15]; /* R data group repetition */
pkt[4] = _hamming[0]; /* S1 MSB number of packets carrying the data group */
pkt[5] = _hamming[1]; /* S2 LSB number of packets carrying the data group */
pkt[6] = _hamming[0]; /* F1 MSB number of data group bytes in the last packet */
pkt[7] = _hamming[0]; /* F2 LSB number of data group bytes in the last packet */
pkt[8] = _hamming[1]; /* N data group suffix indicator */
pkt[9] = 0x90; /* CI TV Command (Medium Priority) */
pkt[10] = 11; /* LI Length (bytes, everything following up until the DGS) */
x = 11;
/* Parameter SREF */
pkt[x++] = 0x40; /* PI Service Reference */
pkt[x++] = 1 + strlen(_sname); /* LI Length */
pkt[x++] = 1; /* Index value 1 */
strcpy((char *) &pkt[x], _sname);
x += strlen(_sname);
if(s->eurocrypt)
{
/* Parameter ACCM */
pkt[x++] = 0x88;
pkt[x++] = 0x03; /* Packet length = 3 */
b = 1 << 15; /* 0: Absence of ECM, 1: Presence of ECM */
b |= 0 << 14; /* 0: CW derived 'by other means', 1: CW derived from CAFCNT */
b |= 1 << 10; /* Subframe related location - TDMCID 01 */
b |= s->ec.ecm_addr; /* Address 346 */
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
pkt[x++] = 0x40; /* Eurocrypt */
}
/* Parameter VCONF */
pkt[x++] = 0x90; /* PI Analogue TV picture (VCONF) */
pkt[x++] = 1; /* LI Length (1 byte) */
b = 1 << 5; /* Always 001 */
//b |= 0 << 4; /* Aspect ratio: 0: 4:3, 1: 16:9 -- note: inverse of line 625 flag */
b |= s->ratio << 4;
b |= 0 << 3; /* Compression ratio: always 0 for Cy = 3:2, Cu = 3:1 */
/* VSAM Vision scrambling and access mode (3 bits) */
//b |= 0 << 2; /* Access type: 0: Free access, 1: Controlled access */
//b |= 0 << 1; /* Scramble type: 0: Double-cut rotation, 1: single-cut line rotation */
//b |= 1 << 0; /* Scrambled: 0: Scrambled, 1: Unscrambled */
b |= s->vsam << 0;
pkt[x++] = b;
/* Parameter DCINF A4 */
pkt[x++] = 0xA4; /* PI TV original sound (DCINF A4) */
pkt[x++] = 3; /* LI Length (3 bytes */
pkt[x++] = 0x09; /* Language (see page 188) = English */
b = 0x0400 | s->audio_channel; /* 0 0 0 0 01 audio_channel */
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
if(s->teletext)
{
/* Parameter DCINF F0 */
pkt[x++] = 0xF0; /* PI CCIR system B cyclic teletext */
pkt[x++] = 3; /* LI Length (3 bytes) */
pkt[x++] = 0x09; /* Language = English */
b = 0; /* Not a part of the packet multiplex */
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
}
/* Update the CI command length */
pkt[10] = x - pkt[10];
/* Generate the DGS CRC */
b = _crc16(&pkt[9], pkt[10] + 2);
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
/* Update the DGH length */
x -= 1;
pkt[6] = _hamming[(x & 0xF0) >> 4];
pkt[7] = _hamming[(x & 0x0F) >> 0];
/* Test if the data is too large for a single packet */
if(x > 45 - 2)
{
fprintf(stderr, "SI DG3 packet overflow (%d/43 bytes)\n", x);
}
/* Generate the overall packet CRC (excludes PT and CRC) */
x = MAC_PAYLOAD_BYTES;
b = _crc16(&pkt[1], x - 3);
pkt[x - 2] = (b & 0x00FF) >> 0;
pkt[x - 1] = (b & 0xFF00) >> 8;
}
static void _create_si_dg4_packet(mac_t *s, uint8_t *pkt)
{
int x;
uint16_t b;
memset(pkt, 0, MAC_PAYLOAD_BYTES);
/* PT Packet Type */
pkt[0] = 0xF8;
/* DGH (Data Group Header) */
pkt[1] = _hamming[4]; /* TG data group type */
pkt[2] = _hamming[0]; /* C data group continuity */
pkt[3] = _hamming[15]; /* R data group repetition */
pkt[4] = _hamming[0]; /* S1 MSB number of packets carrying the data group */
pkt[5] = _hamming[1]; /* S2 LSB number of packets carrying the data group */
pkt[6] = _hamming[0]; /* F1 MSB number of data group bytes in the last packet */
pkt[7] = _hamming[0]; /* F2 LSB number of data group bytes in the last packet */
pkt[8] = _hamming[1]; /* N data group suffix indicator */
pkt[9] = 0xC0; /* OTA Command (Medium Priority) */
pkt[10] = 11; /* LI Length (bytes, everything following up until the DGS) */
x = 11;
/* Parameter SREF */
pkt[x++] = 0x40; /* PI Service Reference */
pkt[x++] = 1 + strlen(_sname); /* LI Length */
pkt[x++] = 1; /* Index value 1 */
strcpy((char *) &pkt[x], _sname);
x += strlen(_sname);
/* Parameter ACMM */
if(s->eurocrypt && s->ec.emmode->id != NULL)
{
pkt[x++] = 0x78;
pkt[x++] = 0x03; /* Packet length = 3 */
b = 1 << 10; /* Subframe related location - TDMCID 01 */
b |= s->ec.emm_addr; /* Address 347 */
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
pkt[x++] = 0x40; /* Eurocrypt */
}
/* Update the CI command length */
pkt[10] = x - pkt[10];
/* Generate the DGS CRC */
b = _crc16(&pkt[9], pkt[10] + 2);
pkt[x++] = (b & 0x00FF) >> 0;
pkt[x++] = (b & 0xFF00) >> 8;
/* Update the DGH length */
x -= 1;
pkt[6] = _hamming[(x & 0xF0) >> 4];
pkt[7] = _hamming[(x & 0x0F) >> 0];
/* Test if the data is too large for a single packet */
if(x > 45 - 2)
{
fprintf(stderr, "SI DG4 packet overflow (%d/43 bytes)\n", x);
}
/* Generate the overall packet CRC (excludes PT and CRC) */
x = MAC_PAYLOAD_BYTES;
b = _crc16(&pkt[1], x - 3);
pkt[x - 2] = (b & 0x00FF) >> 0;
pkt[x - 1] = (b & 0xFF00) >> 8;
}
static void _create_audio_si_packet(mac_t *s, uint8_t *pkt)
{
uint16_t b;
int x;
memset(pkt, 0, MAC_PAYLOAD_BYTES);
pkt[0] = 0x00; /* PT == BI1 */
pkt[1] = _hamming[0]; /* S1 Number of packets MSB */
pkt[2] = _hamming[1]; /* S2 Number of packets LSB */
pkt[3] = _hamming[0]; /* F1 Number of bytes in last packet MSB */
pkt[4] = _hamming[12]; /* F2 Number of bytes in last packet LSB */
pkt[5] = _hamming[1]; /* CI */
pkt[6] = _hamming[10]; /* LI Length (10 bytes) */
b = 0 << 15; /* State (0: Signal Present, 1: interrupted) */
b |= 0 << 13; /* CIB (0: music/speech ON, 1: cross-fade sound ON, 2+3 undefined) */
b |= 0 << 12; /* Timing (0: Continuous, 1: intermittent) */
b |= 1 << 11; /* ID of sound coding blocks (0: BC2, 1: BC1) */
b |= 0 << 10; /* News flash (0: no, 1: yes) */
b |= 0 << 9; /* SDFSCR flag (0: store, 1: don't store) */
b |= 0 << 7; /* Level of error protection (0: first level, 1: second level) */
b |= 1 << 6; /* Coding law (0: linear, 1: companded) */
b |= ((s->vsam & MAC_VSAM_CONTROLLED_ACCESS ? 1 : 0) & s->scramble_audio) << 5; /* Controlled access (0: no, 1: yes) */
b |= s->scramble_audio << 4; /* Scrambling (0: no, 1: yes) */
b |= 0 << 3; /* Automatic mixing (0: mixing not intended, 1: mixing intended) */
b |= 4 << 0; /* Audio config (0: 15 kHz mono, 2: 7 kHz mono, 4: 15 kHz stereo) */
b |= _parity(b) << 8; /* Parity bit */
for(x = 0; x < 5; x++)
{
pkt[7 + x * 2] = (b & 0xFF00) >> 8;
pkt[8 + x * 2] = (b & 0x00FF) >> 0;
}
}
static int _calculate_audio_address(int channels, int quality, int protection, int mode, int index)
{
int addr;
/* Audio channel address calculation:
*
* 001 ? ? ? ? ???_: Index (0-7)
* \ \ \ \____: 0: 10-bit-NICAM, 1: Linear
* \ \ \_____: 0: First level, 1: Second level protection
* \ \______: 0: 7 kHz, 1: 15 kHz
* \_______: 0: Mono, 1: Stereo
*
* 224 = 001 1 1 0 0 000 = Stereo, 15 kHz, First level, Companded
* 129 = 001 0 0 0 0 001 = Mono, 7 kHz, First level, Companded
* 170 = 001 0 1 0 1 010 = Mono, 15 kHz, First level, Linear
*/
addr = 1 << 7;
addr |= (channels & 1) << 6;
addr |= (quality & 1) << 5;
addr |= (protection & 1) << 4;
addr |= (mode & 1) << 3;
addr |= index & 7;
return(addr);
}
int mac_init(vid_t *s)
{
mac_t *mac = &s->mac;
int i, x;
s->audio = 1; /* MAC always has audio */
memset(mac, 0, sizeof(mac_t));
mac->vsam = MAC_VSAM_FREE_ACCESS;
/* Initalise Eurocrypt, if required */
if(s->conf.eurocrypt)
{
mac->vsam = MAC_VSAM_CONTROLLED_ACCESS;
mac->eurocrypt = 1;
i = eurocrypt_init(s, s->conf.eurocrypt);
if(i != VID_OK)
{
return(i);
}
_sname = s->mac.ec.mode->channame;
}
/* Configure scrambling */
switch(s->conf.scramble_video)
{
default: mac->vsam |= MAC_VSAM_UNSCRAMBLED; break;
case 1: mac->vsam |= MAC_VSAM_SINGLE_CUT; break;
case 2: mac->vsam |= MAC_VSAM_DOUBLE_CUT; break;
}
mac->scramble_audio = s->conf.scramble_audio;
if(s->conf.mac_mode == MAC_MODE_D)
{
/* BSB receivers are ignoring the SI packets,
* and expect audio at packet address 128. */
mac->audio_channel = 128; /* Stereo NICAM 32kHz, level 1 protection */
}
else
{
mac->audio_channel = _calculate_audio_address(
MAC_STEREO,
MAC_HIGH_QUALITY,
MAC_FIRST_LEVEL_PROTECTION,
MAC_COMPANDED,
0);
}
mac->teletext = (s->conf.teletext ? 1 : 0);
_update_udt(s->mac.udt, time(NULL));
mac->rdf = 0;
/* Generate the per-line PRBS seeds */
mac->prbs[0] = _PRBS_POLY;
for(i = 1; i < MAC_LINES; i++)
{
mac->prbs[i] = mac->prbs[i - 1];
for(x = 0; x < (s->conf.mac_mode == MAC_MODE_D ? 1296 : 648); x++)
{
_prbs(&mac->prbs[i]);
}
}
/* Init NICAM encoder */
nicam_encode_init(&mac->nicam, NICAM_MODE_STEREO, 0);
mac->subframes[0].pkt_bits = MAC_PACKET_BITS;
mac->subframes[1].pkt_bits = MAC_PACKET_BITS;
mac->polarity = -1;
mac->lut = _duobinary_lut(s->conf.mac_mode, s->width, (s->white_level - s->black_level) * 0.4);
/* Set the video properties */
s->active_width &= ~1; /* Ensure the active width is an even number */
mac->chrominance_width = s->active_width / 2;
mac->chrominance_left = round(s->sample_rate * (233.5 / MAC_CLOCK_RATE));
mac->white_ref_left = round(s->sample_rate * (371.0 / MAC_CLOCK_RATE));
mac->black_ref_left = round(s->sample_rate * (533.0 / MAC_CLOCK_RATE));
mac->black_ref_right = round(s->sample_rate * (695.0 / MAC_CLOCK_RATE));
/* Setup PRBS */