mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
181 lines
6.1 KiB
181 lines
6.1 KiB
/* |
|
* 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 "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]) * 4) + (a)[(as) * 2] - (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->flags & AV_FRAME_FLAG_INTERLACED) ? (new->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? |
|
TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE; |
|
} else if (mode == AUTO_ANALYZE) { |
|
mode = (new->flags & AV_FRAME_FLAG_INTERLACED) ? (new->flags & AV_FRAME_FLAG_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; |
|
}
|
|
|