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tbc-ntscx.cxx
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tbc-ntscx.cxx
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/* LD decoder prototype, Copyright (C) 2013 Chad Page. License: LGPL2 */
#include <complex>
#include "ld-decoder.h"
#include "deemp.h"
bool f_debug = true;
int p_skipframes = 0;
inline double clamp(double v, double low, double high)
{
if (v < low) return low;
else if (v > high) return high;
else return v;
}
// NTSC properties
#ifdef FSC10
const double FSC = 10.0; // in FSC. Must be an even number!
#elif defined(FSC4)
const double FSC = 4.0; // in FSC. Must be an even number!
#else
const double FSC = 8.0; // in FSC. Must be an even number!
#endif
#define OUT_FREQ 4
const int ntsc_iplinei = 227.5 * FSC; // pixels per line
double p_rotdetect = 40;
bool f_highburst = false; // (FSC == 4);
bool f_flip = false;
int writeonfield = 1;
bool do_autoset = (FSC == 4);
bool audio_only = false;
double inscale = 327.68;
double inbase = (inscale * 20); // IRE == -40
long long a_read = 0, v_read = 0;
int va_ratio = 80;
const int vblen = (ntsc_iplinei * 1100); // should be divisible evenly by 16
const int ablen = (ntsc_iplinei * 1100) / 40;
const int absize = ablen * 8;
const int vbsize = vblen * 2;
float abuf[ablen * 2];
unsigned short inbuf[vblen];
inline double in_to_ire(uint16_t level)
{
if (level == 0) return -100;
return -40 + ((double)(level - inbase) / inscale);
}
inline uint16_t ire_to_in(double ire)
{
if (ire <= -60) return 0;
return clamp(((ire + 40) * inscale) + inbase, 1, 65535);
}
inline uint16_t ire_to_out(double ire)
{
if (ire <= -60) return 0;
return clamp(((ire + 60) * 327.68) + 1, 1, 65535);
}
double out_to_ire(uint16_t in)
{
return (in / 327.68) - 60;
}
inline double peakdetect_quad(double *y)
{
return (2 * (y[2] - y[0]) / (2 * (2 * y[1] - y[0] - y[2])));
}
// taken from http://www.paulinternet.nl/?page=bicubic
inline double CubicInterpolate(uint16_t *y, double x)
{
double p[4];
p[0] = y[0]; p[1] = y[1]; p[2] = y[2]; p[3] = y[3];
return p[1] + 0.5 * x*(p[2] - p[0] + x*(2.0*p[0] - 5.0*p[1] + 4.0*p[2] - p[3] + x*(3.0*(p[1] - p[2]) + p[3] - p[0])));
}
inline void Scale(uint16_t *buf, double *outbuf, double start, double end, double outlen, double offset = 0, int from = 0, int to = -1)
{
double inlen = end - start;
double perpel = inlen / outlen;
if (to == -1) to = (int)outlen;
double p1 = start + (offset * perpel);
for (int i = from; i < to; i++) {
int index = (int)p1;
if (index < 1) index = 1;
outbuf[i] = clamp(CubicInterpolate(&buf[index - 1], p1 - index), 0, 65535);
p1 += perpel;
}
}
bool InRange(double v, double l, double h) {
return ((v > l) && (v < h));
}
bool InRangeCF(double v, double l, double h) {
return InRange(v, l * FSC, h * FSC);
}
// tunables
bool freeze_frame = false;
bool despackle = true;
int afd = -1, fd = 0;
double black_ire = 7.5;
int write_locs = -1;
uint16_t frame[505][(int)(OUT_FREQ * 211)];
uint16_t frame_orig[505][(int)(OUT_FREQ * 211)];
double Δframe[505][(int)(OUT_FREQ * 211)];
double Δframe_filt[505][(int)(OUT_FREQ * 211)];
#ifdef FSC10
Filter f_longsync(f_dsync10);
Filter f_syncid(f_syncid10);
Filter f_endsync(f_esync10);
int syncid_offset = syncid10_offset;
#elif defined(FSC4)
Filter f_longsync(f_dsync4);
Filter f_syncid(f_syncid4);
Filter f_endsync(f_esync4);
int syncid_offset = syncid4_offset;
#else
Filter f_longsync(f_dsync);
Filter f_syncid(f_syncid8);
Filter f_endsync(f_esync8);
int syncid_offset = syncid8_offset;
#endif
bool BurstDetect2(double *line, int freq, double _loc, int tgt, double &plevel, double &pphase, bool &phaseflip, bool do_abs = false)
{
int len = (6 * freq);
int loc = _loc * freq;
double start = 0 * freq;
double peakh = 0, peakl = 0;
int npeakh = 0, npeakl = 0;
double lastpeakh = -1, lastpeakl = -1;
double highmin = ire_to_in(f_highburst ? 11 : 9);
double highmax = ire_to_in(f_highburst ? 23 : 22);
double lowmin = ire_to_in(f_highburst ? -11 : -9);
double lowmax = ire_to_in(f_highburst ? -23 : -22);
int begin = loc + (start * freq);
int end = begin + len;
cerr << freq << ' ' << begin << ' ' << end << endl;
// first get average (probably should be a moving one)
double avg = 0;
for (int i = begin; i < end; i++) {
avg += line[i];
}
avg /= (end - begin);
// or we could just ass-u-me IRE 0...
//avg = ire_to_in(0);
// get first and last ZC's, along with first low-to-high transition
double firstc = -1;
double firstc_h = -1;
double lastc = -1;
double avg_htl_zc = 0, avg_lth_zc = 0;
int n_htl_zc = 0, n_lth_zc = 0;
for (int i = begin ; i < end; i++) {
if ((line[i] > highmin) && (line[i] < highmax) && (line[i] > line[i - 1]) && (line[i] > line[i + 1])) {
peakh += line[i];
npeakh++;
lastpeakh = i; lastpeakl = -1;
} else if ((line[i] < lowmin) && (line[i] > lowmax) && (line[i] < line[i - 1]) && (line[i] < line[i + 1])) {
peakl += line[i];
npeakl++;
lastpeakl = i; lastpeakh = -1;
} else if (((line[i] >= avg) && (line[i - 1] < avg)) && (lastpeakl != -1)) {
// XXX: figure this out quadratically
double diff = line[i] - line[i - 1];
double zc = i - ((line[i] - avg) / diff);
if (firstc == -1) firstc = zc;
if (firstc_h == -1) firstc_h = zc;
lastc = zc;
double ph_zc = (zc / freq) - floor(zc / freq);
if (ph_zc > .9) ph_zc -= 1.0;
avg_lth_zc += ph_zc;
n_lth_zc++;
if (f_debug) cerr << "ZCH " << i << ' ' << line[i - 1] << ' ' << avg << ' ' << line[i] << ' ' << zc << ' ' << ph_zc << endl;
} else if (((line[i] <= avg) && (line[i - 1] > avg)) && (lastpeakh != -1)) {
// XXX: figure this out quadratically
double diff = line[i] - line[i - 1];
double zc = i - ((line[i] - avg) / diff);
if (firstc == -1) firstc = zc;
lastc = zc;
double ph_zc = (zc / freq) - floor(zc / freq);
if (ph_zc > .9) ph_zc -= 1.0;
avg_htl_zc += ph_zc;
n_htl_zc++;
if (f_debug) cerr << "ZCL " << i << ' ' << line[i - 1] << ' ' << avg << ' ' << line[i] << ' ' << zc << ' ' << ph_zc << endl;
}
}
// cerr << "ZC " << n_htl_zc << ' ' << n_lth_zc << endl;
if (n_htl_zc) {
avg_htl_zc /= n_htl_zc;
} else return false;
if (n_lth_zc) {
avg_lth_zc /= n_lth_zc;
} else return false;
if (f_debug) cerr << "PDETECT " << fabs(avg_htl_zc - avg_lth_zc) << ' ' << n_htl_zc << ' ' << avg_htl_zc << ' ' << n_lth_zc << ' ' << avg_lth_zc << endl;
double pdiff = fabs(avg_htl_zc - avg_lth_zc);
if ((pdiff < .35) || (pdiff > .65)) return false;
plevel = ((peakh / npeakh) - (peakl / npeakl)) / 4.3;
if (avg_htl_zc < .5) {
pphase = (avg_htl_zc + (avg_lth_zc - .5)) / 2;
phaseflip = false;
} else {
pphase = (avg_lth_zc + (avg_htl_zc - .5)) / 2;
phaseflip = true;
}
return true;
}
double pleft = 0, pright = 0;
Filter f_fml(f_fmdeemp), f_fmr(f_fmdeemp);
uint16_t aout[512];
int aout_i = 0;
void ProcessAudioSample(float left, float right, double vel)
{
left = f_fml.feed(left * (65535.0 / 300000.0));
left += 32768;
right = f_fmr.feed(right * (65535.0 / 300000.0));
right += 32768;
aout[aout_i * 2] = clamp(left, 0, 65535);
aout[(aout_i * 2) + 1] = clamp(right, 0, 65535);
aout_i++;
if (aout_i == 256) {
int rv = write(audio_only ? 1 : 3, aout, sizeof(aout));
rv = aout_i = 0;
}
}
double afreq = 48000;
double prev_time = -1;
double next_audsample = 0;
size_t prev_loc = -1;
long long prev_index = 0, prev_i = 0;
void ProcessAudio(double frame, long long loc, float *abuf)
{
double time = frame / (30000.0 / 1001.0);
// cerr << "PA " << frame << ' ' << loc << endl;
if (afd < 0) return;
if (prev_time >= 0) {
while (next_audsample < time) {
double i1 = (next_audsample - prev_time) / (time - prev_time);
long long i = (i1 * (loc - prev_loc)) + prev_loc;
if (i < v_read) {
ProcessAudioSample(f_fml.val(), f_fmr.val(), 1.0);
} else {
long long index = (i / va_ratio) - a_read;
if (index >= ablen) {
cerr << "audio error " << frame << " " << time << " " << i1 << " " << i << " " << index << " " << ablen << endl;
index = ablen - 1;
// exit(0);
}
float left = abuf[index * 2], right = abuf[(index * 2) + 1];
cerr << "A " << frame << ' ' << loc << ' ' << i1 << ' ' << i << ' ' << i - prev_i << ' ' << index << ' ' << index - prev_index << ' ' << left << ' ' << right << endl;
prev_index = index;
prev_i = i;
ProcessAudioSample(left, right, 1.0);
}
next_audsample += 1.0 / afreq;
}
}
prev_time = time; prev_loc = loc;
}
double tline = 0, line = -2;
int phase = -1;
bool first = true;
int iline = 0;
int frameno = -1;
//uint16_t synclevel = 12000;
uint16_t synclevel = inbase + (inscale * 15);
bool IsPeak(double *p, int i)
{
return (fabs(p[i]) >= fabs(p[i - 1])) && (fabs(p[i]) >= fabs(p[i + 1]));
}
// Essential VBI/Phillips code reference: http://www.daphne-emu.com/mediawiki/index.php/VBIInfo
// (LD-V6000A info page is cryptic but very essential!)
double dots_usec = 4.0 * 315.0 / 88.0;
uint32_t ReadPhillipsCode(uint16_t *line) {
int first_bit = -1; // 108 - dots_usec;
uint32_t out = 0;
double Δline[844];
for (int i = 1; i < 843; i++) {
Δline[i] = line[i] - line[i - 1];
}
// find first positive transition (exactly halfway into bit 0 which is *always* 1)
for (int i = 70; (first_bit == -1) && (i < 140); i++) {
// cerr << i << ' ' << out_to_ire(line[i]) << ' ' << Δline[i] << endl;
if (IsPeak(Δline, i) && (Δline[i] > 10 * 327.68)) {
first_bit = i;
}
}
if (first_bit < 0) return 0;
for (int i = 0; i < 24; i++) {
int rloc = -1, loc = (first_bit + (i * 2 * dots_usec));
double rpeak = -1;
for (int h = loc - 8; (h < loc + 8); h++) {
if (IsPeak(Δline, h)) {
if (fabs(Δline[h]) > rpeak) {
rpeak = fabs(Δline[h]);
rloc = h;
}
}
}
if (rloc == -1) rloc = loc;
out |= (Δline[rloc] > 0) ? (1 << (23 - i)) : 0;
cerr << i << ' ' << loc << ' ' << Δline[loc] << ' ' << rloc << ' ' << Δline[rloc] << ' ' << Δline[rloc] / inscale << ' ' << out << endl;
if (!i) first_bit = rloc;
}
cerr << "P " << hex << out << dec << endl;
return out;
}
const int out_x = 844;
const int out_y = 505;
inline double max(double a, double b)
{
return (a > b) ? a : b;
}
void Despackle()
{
memcpy(frame_orig, frame, sizeof(frame));
for (int y = 22; y < out_y; y++) {
double rotdetect = p_rotdetect * inscale;
for (int x = 60; x < out_x - 16; x++) {
double comp = 0;
for (int cy = y - 1; (cy < (y + 2)) && (cy < out_y); cy++) {
for (int cx = x - 3; (cx < x + 3) && (cx < (out_x - 12)); cx++) {
comp = max(comp, Δframe_filt[cy][cx]);
}
}
if ((out_to_ire(frame[y][x]) < -20) || (out_to_ire(frame[y][x]) > 140) || ((Δframe[y][x] > rotdetect) && ((Δframe[y][x] - comp) > rotdetect))) {
cerr << "R " << y << ' ' << x << ' ' << rotdetect << ' ' << Δframe[y][x] << ' ' << comp << ' ' << Δframe_filt[y][x] << endl;
for (int m = x - 4; (m < (x + 14)) && (m < out_x); m++) {
double tmp = (((double)frame_orig[y - 2][m - 2]) + ((double)frame_orig[y - 2][m + 2])) / 2;
if (y < (out_y - 3)) {
tmp /= 2;
tmp += ((((double)frame_orig[y + 2][m - 2]) + ((double)frame_orig[y + 2][m + 2])) / 4);
}
frame[y][m] = clamp(tmp, 0, 65535);
}
x = x + 14;
}
}
}
}
bool CheckWhiteFlag(int l)
{
int wc = 0;
for (int i = 100; i < 800; i++) {
if (out_to_ire(frame[l][i]) > 80) wc++;
if (wc >= 200) return true;
}
return false;
}
void DecodeVBI()
{
uint32_t code[6];
uint32_t clv_time = 0;
uint32_t chap = 0;
uint32_t flags = 0;
bool odd = false; // CAV framecode on odd scanline
bool even = false; // on even scanline (need to report both, since some frames have none!)
bool clv = false;
bool cx = false;
int fnum = 0;
memset(code, 0, sizeof(code));
for (int i = 14; i < 20; i++) {
code[i - 14] = ReadPhillipsCode(frame[i]);
}
cerr << "Phillips codes " << hex << code[0] << ' ' << code[1] << ' ' << code[2] << ' ' << code[3] << ' ' << code[4] << ' ' << code[5] << dec << endl;
for (int i = 0; i < 6; i++) {
frame[0][i * 2] = code[i] >> 16;
frame[0][(i * 2) + 1] = code[i] & 0xffff;
if ((code[i] & 0xf00fff) == 0x800fff) {
chap = ((code[i] & 0x00f000) >> 12);
chap += (((code[i] & 0x0f0000) >> 16) - 8) * 10;
}
if ((code[i] & 0xfff000) == 0x8dc000) {
cx = true;
}
if (0x87ffff == code[i]) {
clv = true;
}
}
if (clv == true) {
uint16_t hours = 0;
uint16_t minutes = 0;
uint16_t seconds = 0;
uint16_t framenum = 0;
// Find CLV frame # data
for (int i = 0; i < 6; i++) {
// CLV Picture #
if (((code[i] & 0xf0f000) == 0x80e000) && ((code[i] & 0x0f0000) >= 0x0a0000)) {
seconds = (((code[i] & 0x0f0000) - 0x0a0000) >> 16) * 10;
seconds += (code[i] & 0x000f00) >> 8;
framenum = code[i] & 0x0f;
framenum += ((code[i] & 0x000f0) >> 4) * 10;
}
if ((code[i] & 0xf0ff00) == 0xf0dd00) {
hours = ((code[i] & 0x0f0000) >> 16);
minutes = code[i] & 0x0f;
minutes += ((code[i] & 0x000f0) >> 4) * 10;
}
}
fnum = (((hours * 3600) + (minutes * 60) + seconds) * 30) + framenum;
clv_time = (hours << 24) | (minutes << 16) || (seconds << 8) || framenum;
cerr << "CLV " << hours << ':' << minutes << ':' << seconds << '.' << framenum << endl;
} else {
for (int i = 0; i < 6; i++) {
// CAV frame: f80000 + frame
if ((code[i] >= 0xf80000) && (code[i] <= 0xffffff)) {
// Convert from BCD to binary
fnum = code[i] & 0x0f;
fnum += ((code[i] & 0x000f0) >> 4) * 10;
fnum += ((code[i] & 0x00f00) >> 8) * 100;
fnum += ((code[i] & 0x0f000) >> 12) * 1000;
fnum += ((code[i] & 0xf0000) >> 16) * 10000;
if (fnum >= 80000) fnum -= 80000;
cerr << i << " CAV frame " << fnum << endl;
if (i % 2) odd = true;
if (!(i % 2)) even = true;
}
}
}
cerr << " fnum " << fnum << endl;
flags = (clv ? FRAME_INFO_CLV : 0) | (even ? FRAME_INFO_CAV_EVEN : 0) | (odd ? FRAME_INFO_CAV_ODD : 0) | (cx ? FRAME_INFO_CX : 0);
flags |= CheckWhiteFlag(4) ? FRAME_INFO_WHITE_EVEN : 0;
flags |= CheckWhiteFlag(5) ? FRAME_INFO_WHITE_ODD : 0;
cerr << "Status " << hex << flags << dec << " chapter " << chap << endl;
frame[0][12] = chap;
frame[0][13] = flags;
frame[0][14] = fnum >> 16;
frame[0][15] = fnum & 0xffff;
frame[0][16] = clv_time >> 16;
frame[0][17] = clv_time & 0xffff;
}
int find_sync(uint16_t *buf, int len, int tgt = 50, bool debug = false)
{
const int pad = 96;
int rv = -1;
const uint16_t to_min = ire_to_in(-45), to_max = ire_to_in(-35);
const uint16_t err_min = ire_to_in(-55), err_max = ire_to_in(30);
uint16_t clen = tgt * 3;
uint16_t *circbuf = new uint16_t[clen];
uint16_t *circbuf_err = new uint16_t[clen];
memset(circbuf, 0, clen * 2);
memset(circbuf_err, 0, clen * 2);
int count = 0, errcount = 0, peak = 0, peakloc = 0;
for (int i = 0; (rv == -1) && (i < len); i++) {
int nv = (buf[i] >= to_min) && (buf[i] < to_max);
int err = (buf[i] <= err_min) || (buf[i] >= err_max);
count = count - circbuf[i % clen] + nv;
circbuf[i % clen] = nv;
errcount = errcount - circbuf_err[i % clen] + err;
circbuf_err[i % clen] = err;
if (count > peak) {
peak = count;
peakloc = i;
} else if ((count > tgt) && ((i - peakloc) > pad)) {
rv = peakloc;
if ((FSC > 4) && (errcount > 1)) {
cerr << "HERR " << errcount << endl;
rv = -rv;
}
}
if (debug) {
cerr << i << ' ' << buf[i] << ' ' << peak << ' ' << peakloc << ' ' << i - peakloc << endl;
}
}
if (rv == -1)
cerr << "not found " << peak << ' ' << peakloc << endl;
return rv;
}
// This could probably be used for more than just field det, but eh
int count_slevel(uint16_t *buf, int begin, int end)
{
const uint16_t to_min = ire_to_in(-45), to_max = ire_to_in(-35);
int count = 0;
for (int i = begin; i < end; i++) {
count += (buf[i] >= to_min) && (buf[i] < to_max);
}
return count;
}
// returns index of end of VSYNC - negative if _ field
int find_vsync(uint16_t *buf, int len, int offset = 0)
{
const uint16_t field_len = FSC * 227.5 * 280;
if (len < field_len) return -1;
int pulse_ends[6];
int slen = len;
int loc = offset;
for (int i = 0; i < 6; i++) {
// 32xFSC is *much* shorter, but it shouldn't get confused for an hsync -
// and on rotted disks and ones with burst in vsync, this helps
int syncend = abs(find_sync(&buf[loc], slen, 32 * FSC));
pulse_ends[i] = syncend + loc;
cerr << pulse_ends[i] << endl;
loc += syncend;
slen = 3840;
}
int rv = pulse_ends[5];
// determine line type
int before_end = pulse_ends[0] - (127.5 * FSC);
int before_start = before_end - (227.5 * 4.5 * FSC);
int pc_before = count_slevel(buf, before_start, before_end);
int after_start = pulse_ends[5];
int after_end = after_start + (227.5 * 4.5 * FSC);
int pc_after = count_slevel(buf, after_start, after_end);
cerr << "beforeafter: " << pulse_ends[0] + offset << ' ' << pulse_ends[5] + offset << ' ' << pc_before << ' ' << pc_after << endl;
if (pc_before < pc_after) rv = -rv;
return rv;
}
// returns end of each line, -end if error detected in this phase
// (caller responsible for freeing array)
bool find_hsyncs(uint16_t *buf, int len, int offset, double *rv, int nlines = 253)
{
// sanity check (XXX: assert!)
if (len < (nlines * FSC * 227.5))
return false;
int loc = offset;
for (int line = 0; line < nlines; line++) {
cerr << line << ' ' << loc << endl;
int syncend = find_sync(&buf[loc], 227.5 * 3 * FSC, 8 * FSC);
double gap = 227.5 * FSC;
int err_offset = 0;
while (syncend < -1) {
cerr << "error found " << line << ' ' << syncend << ' ';
err_offset += gap;
syncend = find_sync(&buf[loc] + err_offset, 227.5 * 3 * FSC, 8 * FSC);
cerr << syncend << endl;
}
// If it skips a scan line, fake it
if ((line > 0) && (line < nlines) && (syncend > (40 * FSC))) {
rv[line] = -(abs(rv[line - 1]) + gap);
cerr << "XX " << line << ' ' << loc << ' ' << syncend << ' ' << rv[line] << endl;
syncend -= gap;
loc += gap;
} else {
rv[line] = loc + syncend;
if (err_offset) rv[line] = -rv[line];
if (syncend != -1) {
loc += fabs(syncend) + (200 * FSC);
} else {
loc += gap;
}
}
}
return rv;
}
// correct damaged hsyncs by interpolating neighboring lines
void CorrectDamagedHSyncs(double *hsyncs, bool *err)
{
for (int line = 1; line < 251; line++) {
if (err[line] == false) continue;
int lprev, lnext;
for (lprev = line - 1; (err[lprev] == true) && (lprev >= 0); lprev--);
for (lnext = line + 1; (err[lnext] == true) && (lnext < 252); lnext++);
// This shouldn't happen...
if ((lprev < 0) || (lnext == 252)) continue;
double linex = (hsyncs[line] - hsyncs[0]) / line;
cerr << "FIX " << line << ' ' << linex << ' ' << hsyncs[line] << ' ' << hsyncs[line] - hsyncs[line - 1] << ' ' << lprev << ' ' << lnext << ' ' ;
double lavg = (hsyncs[lnext] - hsyncs[lprev]) / (lnext - lprev);
hsyncs[line] = hsyncs[lprev] + (lavg * (line - lprev));
cerr << hsyncs[line] << endl;
}
}
double psync[ntsc_iplinei*1200];
int Process(uint16_t *buf, int len, float *abuf, int alen)
{
double linebuf[1820];
double hsyncs[253];
int field = -1;
int offset = 500;
memset(frame, 0, sizeof(frame));
while (field < 1) {
//find_vsync(&buf[firstsync - 1920], len - (firstsync - 1920));
int vs = find_vsync(buf, len, offset);
bool oddeven = vs > 0;
vs = abs(vs);
cerr << "findvsync " << oddeven << ' ' << vs << endl;
if ((oddeven == false) && (field == -1))
return vs + (FSC * 227.5 * 240);
// Process skip-frames mode - zoom forward an entire frame
if (frameno < p_skipframes) {
frameno++;
return vs + (FSC * 227.5 * 510);
}
field++;
// zoom ahead to close to the first full proper sync
if (oddeven) {
vs = abs(vs) + (750 * FSC);
} else {
vs = abs(vs) + (871 * FSC);
}
find_hsyncs(buf, len, vs, hsyncs);
bool err[252];
// find hsyncs (rough alignment)
for (int line = 0; line < 252; line++) {
err[line] = hsyncs[line] < 0;
hsyncs[line] = abs(hsyncs[line]);
}
// Determine vsync->0/7.5IRE transition point (TODO: break into function)
for (int line = 0; line < 252; line++) {
if (err[line] == true) continue;
double prev = 0, begsync = -1, endsync = -1;
const uint16_t tpoint = ire_to_in(-20);
// find beginning of hsync
f_endsync.clear();
prev = 0;
for (int i = hsyncs[line] - (20 * FSC); i < hsyncs[line] - (8 * FSC); i++) {
double cur = f_endsync.feed(buf[i]);
if ((prev > tpoint) && (cur < tpoint)) {
// cerr << 'B' << ' ' << i << ' ' << line << ' ' << hsyncs[line] << ' ';
double diff = cur - prev;
begsync = ((i - 8) + (tpoint - prev) / diff);
// cerr << prev << ' ' << tpoint << ' ' << cur << ' ' << hsyncs[line] << endl;
break;
}
prev = cur;
}
// find end of hsync
f_endsync.clear();
prev = 0;
for (int i = hsyncs[line] - (2 * FSC); i < hsyncs[line] + (4 * FSC); i++) {
double cur = f_endsync.feed(buf[i]);
if ((prev < tpoint) && (cur > tpoint)) {
// cerr << 'E' << ' ' << line << ' ' << hsyncs[line] << ' ';
double diff = cur - prev;
endsync = ((i - 8) + (tpoint - prev) / diff);
// cerr << prev << ' ' << tpoint << ' ' << cur << ' ' << hsyncs[line] << endl;
break;
}
prev = cur;
}
cerr << "A " << line << ' ' << begsync << ' ' << endsync << ' ' << endsync - begsync << endl;
if ((!InRangeCF(endsync - begsync, 15.75, 17.25)) || (begsync == -1) || (endsync == -1)) {
err[line] = true;
} else {
hsyncs[line] = endsync;
}
}
// We need semi-correct lines for the next phases
CorrectDamagedHSyncs(hsyncs, err);
bool phaseflip;
double blevel[252], phase[252];
double tpodd = 0, tpeven = 0;
int nodd = 0, neven = 0; // need to track these to exclude bad lines
double bphase = 0;
// detect alignment (undamaged lines only)
for (int line = 0; line < 64; line++) {
double line1 = hsyncs[line], line2 = hsyncs[line + 1];
if (err[line] == true) {
cerr << "ERR " << line << endl;
continue;
}
// burst detection/correction
Scale(buf, linebuf, line1, line2, 227.5 * FSC);
if (!BurstDetect2(linebuf, FSC, 4, -1, blevel[line], bphase, phaseflip, true)) {
cerr << "ERRnoburst " << line << endl;
err[line] = true;
continue;
}
phase[line] = bphase;
if (line % 2) {
tpodd += phaseflip;
nodd++;
} else {
tpeven += phaseflip;
neven++;
}
cerr << "BURST " << line << ' ' << line1 << ' ' << line2 << ' ' << blevel[line] << ' ' << bphase << endl;
}
bool fieldphase = fabs(tpeven / neven) < fabs(tpodd / nodd);
cerr << "PHASES: " << neven + nodd << ' ' << tpeven / neven << ' ' << tpodd / nodd << ' ' << fieldphase << endl;
for (int pass = 0; pass < 2; pass++) {
for (int line = 0; line < 252; line++) {
bool lphase = ((line % 2) == 0);
if (fieldphase) lphase = !lphase;
double line1c = hsyncs[line] + ((hsyncs[line + 1] - hsyncs[line]) * 14.0 / 227.5);
Scale(buf, linebuf, hsyncs[line], line1c, 14 * FSC);
if (!BurstDetect2(linebuf, FSC, 4, lphase, blevel[line], bphase, phaseflip, false)) {
err[line] = true;
continue;
}
double tgt = .260;
// if (bphase > .5) tgt += .5;
double adj = (tgt - bphase) * 8;
cerr << "ADJ " << line << ' ' << pass << ' ' << bphase << ' ' << tgt << ' ' << adj << endl;
hsyncs[line] -= adj;
}
}
CorrectDamagedHSyncs(hsyncs, err);
// final output
for (int line = 0; line < 252; line++) {
double line1 = hsyncs[line], line2 = hsyncs[line + 1];
int oline = 3 + (line * 2) + (oddeven ? 0 : 1);
// 33 degree shift
double shift33 = (33.0 / 360.0) * 4 * 2;
if (FSC == 4) {
// XXX THIS IS BUGGED, but works
shift33 = (107.0 / 360.0) * 4 * 2;
}
double pt = -12 - shift33; // align with previous-gen tbc output
Scale(buf, linebuf, line1 + pt, line2 + pt, 910, 0);
ProcessAudio((line / 525.0) + frameno + (field * .5), v_read + hsyncs[line], abuf);
bool lphase = ((line % 2) == 0);
if (fieldphase) lphase = !lphase;
frame[oline][0] = (lphase == 0) ? 32768 : 16384;
frame[oline][1] = blevel[line] * (327.68 / inscale); // ire_to_out(in_to_ire(blevel[line]));
if (err[line]) {
frame[oline][3] = frame[oline][5] = 65000;
frame[oline][4] = frame[oline][6] = 0;
}
for (int t = 4; t < 844; t++) {
double o = linebuf[t];
if (do_autoset) o = ire_to_out(in_to_ire(o));
frame[oline][t] = (uint16_t)clamp(o, 1, 65535);
}
}
offset = abs(hsyncs[250]);
cerr << "new offset " << offset << endl;
}
if (despackle) Despackle();
// Decode VBI data
DecodeVBI();
frameno++;
cerr << "WRITING\n";
write(1, frame, sizeof(frame));
memset(frame, 0, sizeof(frame));
return offset;
}
bool seven_five = (FSC == 4);
double low = 65535, high = 0;
double f[vblen];
void autoset(uint16_t *buf, int len, bool fullagc = true)
{
int lowloc = -1;
int checklen = (int)(FSC * 4);
if (!fullagc) {
low = 65535;
high = 0;
}
cerr << "old base:scale = " << inbase << ':' << inscale << endl;
// f_longsync.clear(0);
// phase 1: get low (-40ire) and high (??ire)
for (int i = 0; i < len; i++) {
f[i] = f_longsync.feed(buf[i]);
if ((i > (FSC * 256)) && (f[i] < low) && (f[i - checklen] < low)) {
if (f[i - checklen] > f[i])
low = f[i - checklen];
else
low = f[i];
lowloc = i;
}
if ((i > (FSC * 256)) && (f[i] > high) && (f[i - checklen] > high)) {
if (f[i - checklen] < f[i])
high = f[i - checklen];
else
high = f[i];
}
}
// phase 2: attempt to figure out the 0IRE porch near the sync
if (!fullagc) {
int gap = high - low;
int nloc;
for (nloc = lowloc; (nloc > lowloc - (FSC * 320)) && (f[nloc] < (low + (gap / 8))); nloc--);
cerr << nloc << ' ' << (lowloc - nloc) / FSC << ' ' << f[nloc] << endl;
nloc -= (FSC * 4);
cerr << nloc << ' ' << (lowloc - nloc) / FSC << ' ' << f[nloc] << endl;
cerr << "old base:scale = " << inbase << ':' << inscale << endl;
inscale = (f[nloc] - low) / ((seven_five) ? 47.5 : 40.0);
inbase = low - (20 * inscale); // -40IRE to -60IRE
if (inbase < 1) inbase = 1;
cerr << "new base:scale = " << inbase << ':' << inscale << endl;
} else {
inscale = (high - low) / 140.0;
}
inbase = low; // -40IRE to -60IRE
if (inbase < 1) inbase = 1;
cerr << "new base:scale = " << inbase << ':' << inscale << " low: " << low << ' ' << high << endl;