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/*
* Copyright (c) 2004 Ville Saari
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#undef pixel
#undef accumulator
#if DEPTH == 8
#define pixel uint8_t
#define accumulator int
#else
#define pixel uint16_t
#define accumulator int64_t
#endif
#define fn3(a,b) a##_##b
#define fn2(a,b) fn3(a,b)
#define fn(a) fn2(a, DEPTH)
/*
* This macro interpolates the value of both fields at a point halfway
* between lines and takes the squared difference. In field resolution
* the point is a quarter pixel below a line in one field and a quarter
* pixel above a line in other.
*
* (The result is actually multiplied by 25)
*/
#define DIFF(a, as, b, bs) ((t) = ((*(a) - (b)[bs]) << 2) + (a)[(as) << 1] - (b)[-(bs)], (t) * (t))
/*
* Find which field combination has the smallest average squared difference
* between the fields.
*/
static enum PhaseMode fn(analyze_plane)(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new)
{
double bdiff, tdiff, pdiff;
if (mode == AUTO) {
mode = new->interlaced_frame ? new->top_field_first ?
TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE;
} else if (mode == AUTO_ANALYZE) {
mode = new->interlaced_frame ? new->top_field_first ?
TOP_FIRST_ANALYZE : BOTTOM_FIRST_ANALYZE : FULL_ANALYZE;
}
if (mode <= BOTTOM_FIRST) {
bdiff = pdiff = tdiff = 65536.0;
} else {
const double factor = 1. / (25. * (1 << (DEPTH - 8)) * (1 << (DEPTH - 8)));
const int ns = new->linesize[0] / sizeof(pixel);
const int os = old->linesize[0] / sizeof(pixel);
const pixel *nptr = (pixel *)new->data[0];
const pixel *optr = (pixel *)old->data[0];
const int h = new->height;
const int w = new->width;
accumulator bdif, tdif, pdif;
double scale;
int top = 0, t;
const pixel *rend, *end = nptr + (h - 2) * ns;
bdiff = pdiff = tdiff = 0.0;
nptr += ns;
optr += os;
while (nptr < end) {
pdif = tdif = bdif = 0;
switch (mode) {
case TOP_FIRST_ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
tdif += DIFF(nptr, ns, optr, os);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
tdif += DIFF(optr, os, nptr, ns);
}
}
break;
case BOTTOM_FIRST_ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
bdif += DIFF(optr, os, nptr, ns);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
bdif += DIFF(nptr, ns, optr, os);
}
}
break;
case ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
tdif += DIFF(nptr, ns, optr, os);
bdif += DIFF(optr, os, nptr, ns);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
bdif += DIFF(nptr, ns, optr, os);
tdif += DIFF(optr, os, nptr, ns);
}
}
break;
case FULL_ANALYZE:
if (top) {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
tdif += DIFF(nptr, ns, optr, os);
bdif += DIFF(optr, os, nptr, ns);
}
} else {
for (rend = nptr + w; nptr < rend; nptr++, optr++) {
pdif += DIFF(nptr, ns, nptr, ns);
bdif += DIFF(nptr, ns, optr, os);
tdif += DIFF(optr, os, nptr, ns);
}
}
break;
default:
av_assert0(0);
}
pdiff += (double)pdif;
tdiff += (double)tdif;
bdiff += (double)bdif;
nptr += ns - w;
optr += os - w;
top ^= 1;
}
scale = 1.0 / (w * (h - 3)) * factor;
pdiff *= scale;
tdiff *= scale;
bdiff *= scale;
if (mode == TOP_FIRST_ANALYZE) {
bdiff = 65536.0;
} else if (mode == BOTTOM_FIRST_ANALYZE) {
tdiff = 65536.0;
} else if (mode == ANALYZE) {
pdiff = 65536.0;
}
if (bdiff < pdiff && bdiff < tdiff) {
mode = BOTTOM_FIRST;
} else if (tdiff < pdiff && tdiff < bdiff) {
mode = TOP_FIRST;
} else {
mode = PROGRESSIVE;
}
}
av_log(ctx, AV_LOG_DEBUG, "mode=%c tdiff=%f bdiff=%f pdiff=%f\n",
mode == BOTTOM_FIRST ? 'b' : mode == TOP_FIRST ? 't' : 'p',
tdiff, bdiff, pdiff);
return mode;
}
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