mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
5 years ago
parent
732d77dc50
commit
314a783bb8
2 changed files with 246 additions and 148 deletions
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/*
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* Copyright (c) 2004 Ville Saari |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/avassert.h" |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "internal.h" |
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#include "video.h" |
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#undef pixel |
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#undef accumulator |
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#if DEPTH == 8 |
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#define pixel uint8_t |
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#define accumulator int |
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#else |
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#define pixel uint16_t |
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#define accumulator int64_t |
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#endif |
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#define fn3(a,b) a##_##b |
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#define fn2(a,b) fn3(a,b) |
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#define fn(a) fn2(a, DEPTH) |
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/*
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* This macro interpolates the value of both fields at a point halfway |
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* between lines and takes the squared difference. In field resolution |
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* the point is a quarter pixel below a line in one field and a quarter |
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* pixel above a line in other. |
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* |
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* (The result is actually multiplied by 25) |
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*/ |
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#define DIFF(a, as, b, bs) ((t) = ((*(a) - (b)[bs]) << 2) + (a)[(as) << 1] - (b)[-(bs)], (t) * (t)) |
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/*
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* Find which field combination has the smallest average squared difference |
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* between the fields. |
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*/ |
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static enum PhaseMode fn(analyze_plane)(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new) |
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{ |
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double bdiff, tdiff, pdiff; |
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if (mode == AUTO) { |
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mode = new->interlaced_frame ? new->top_field_first ? |
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TOP_FIRST : BOTTOM_FIRST : PROGRESSIVE; |
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} else if (mode == AUTO_ANALYZE) { |
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mode = new->interlaced_frame ? new->top_field_first ? |
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TOP_FIRST_ANALYZE : BOTTOM_FIRST_ANALYZE : FULL_ANALYZE; |
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} |
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if (mode <= BOTTOM_FIRST) { |
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bdiff = pdiff = tdiff = 65536.0; |
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} else { |
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const double factor = 1. / (25. * (1 << (DEPTH - 8)) * (1 << (DEPTH - 8))); |
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const int ns = new->linesize[0] / sizeof(pixel); |
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const int os = old->linesize[0] / sizeof(pixel); |
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const pixel *nptr = (pixel *)new->data[0]; |
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const pixel *optr = (pixel *)old->data[0]; |
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const int h = new->height; |
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const int w = new->width; |
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accumulator bdif, tdif, pdif; |
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double scale; |
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int top = 0, t; |
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const pixel *rend, *end = nptr + (h - 2) * ns; |
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bdiff = pdiff = tdiff = 0.0; |
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nptr += ns; |
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optr += os; |
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while (nptr < end) { |
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pdif = tdif = bdif = 0; |
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switch (mode) { |
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case TOP_FIRST_ANALYZE: |
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if (top) { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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pdif += DIFF(nptr, ns, nptr, ns); |
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tdif += DIFF(nptr, ns, optr, os); |
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} |
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} else { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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pdif += DIFF(nptr, ns, nptr, ns); |
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tdif += DIFF(optr, os, nptr, ns); |
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} |
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} |
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break; |
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case BOTTOM_FIRST_ANALYZE: |
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if (top) { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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pdif += DIFF(nptr, ns, nptr, ns); |
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bdif += DIFF(optr, os, nptr, ns); |
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} |
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} else { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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pdif += DIFF(nptr, ns, nptr, ns); |
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bdif += DIFF(nptr, ns, optr, os); |
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} |
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} |
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break; |
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case ANALYZE: |
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if (top) { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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tdif += DIFF(nptr, ns, optr, os); |
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bdif += DIFF(optr, os, nptr, ns); |
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} |
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} else { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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bdif += DIFF(nptr, ns, optr, os); |
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tdif += DIFF(optr, os, nptr, ns); |
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} |
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} |
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break; |
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case FULL_ANALYZE: |
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if (top) { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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pdif += DIFF(nptr, ns, nptr, ns); |
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tdif += DIFF(nptr, ns, optr, os); |
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bdif += DIFF(optr, os, nptr, ns); |
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} |
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} else { |
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for (rend = nptr + w; nptr < rend; nptr++, optr++) { |
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pdif += DIFF(nptr, ns, nptr, ns); |
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bdif += DIFF(nptr, ns, optr, os); |
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tdif += DIFF(optr, os, nptr, ns); |
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} |
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} |
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break; |
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default: |
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av_assert0(0); |
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} |
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pdiff += (double)pdif; |
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tdiff += (double)tdif; |
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bdiff += (double)bdif; |
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nptr += ns - w; |
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optr += os - w; |
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top ^= 1; |
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} |
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scale = 1.0 / (w * (h - 3)) * factor; |
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pdiff *= scale; |
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tdiff *= scale; |
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bdiff *= scale; |
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if (mode == TOP_FIRST_ANALYZE) { |
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bdiff = 65536.0; |
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} else if (mode == BOTTOM_FIRST_ANALYZE) { |
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tdiff = 65536.0; |
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} else if (mode == ANALYZE) { |
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pdiff = 65536.0; |
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} |
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if (bdiff < pdiff && bdiff < tdiff) { |
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mode = BOTTOM_FIRST; |
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} else if (tdiff < pdiff && tdiff < bdiff) { |
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mode = TOP_FIRST; |
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} else { |
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mode = PROGRESSIVE; |
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} |
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} |
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av_log(ctx, AV_LOG_DEBUG, "mode=%c tdiff=%f bdiff=%f pdiff=%f\n", |
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mode == BOTTOM_FIRST ? 'b' : mode == TOP_FIRST ? 't' : 'p', |
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tdiff, bdiff, pdiff); |
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return mode; |
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} |
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