330 lines
10 KiB
C
330 lines
10 KiB
C
/*
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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 "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.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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enum PhaseMode {
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PROGRESSIVE,
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TOP_FIRST,
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BOTTOM_FIRST,
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TOP_FIRST_ANALYZE,
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BOTTOM_FIRST_ANALYZE,
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ANALYZE,
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FULL_ANALYZE,
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AUTO,
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AUTO_ANALYZE
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};
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typedef struct PhaseContext {
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const AVClass *class;
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enum PhaseMode mode;
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AVFrame *frame; /* previous frame */
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int nb_planes;
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int planeheight[4];
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int linesize[4];
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} PhaseContext;
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#define OFFSET(x) offsetof(PhaseContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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#define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }
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static const AVOption phase_options[] = {
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{ "mode", "set phase mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=AUTO_ANALYZE}, PROGRESSIVE, AUTO_ANALYZE, FLAGS, "mode" },
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CONST("p", "progressive", PROGRESSIVE, "mode"),
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CONST("t", "top first", TOP_FIRST, "mode"),
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CONST("b", "bottom first", BOTTOM_FIRST, "mode"),
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CONST("T", "top first analyze", TOP_FIRST_ANALYZE, "mode"),
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CONST("B", "bottom first analyze", BOTTOM_FIRST_ANALYZE, "mode"),
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CONST("u", "analyze", ANALYZE, "mode"),
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CONST("U", "full analyze", FULL_ANALYZE, "mode"),
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CONST("a", "auto", AUTO, "mode"),
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CONST("A", "auto analyze", AUTO_ANALYZE, "mode"),
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(phase);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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PhaseContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int ret;
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if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
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return ret;
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s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->planeheight[0] = s->planeheight[3] = inlink->h;
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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return 0;
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}
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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 analyze_plane(void *ctx, enum PhaseMode mode, AVFrame *old, AVFrame *new)
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{
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double bdiff, tdiff, pdiff, scale;
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const int ns = new->linesize[0];
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const int os = old->linesize[0];
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const uint8_t *nptr = new->data[0];
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const uint8_t *optr = 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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int bdif, tdif, pdif;
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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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int top = 0, t;
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const uint8_t *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)) / 25.0;
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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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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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PhaseContext *s = ctx->priv;
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enum PhaseMode mode;
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int plane, top, y;
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AVFrame *out;
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if (ctx->is_disabled) {
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av_frame_free(&s->frame);
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/* we keep a reference to the previous frame so the filter can start
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* being useful as soon as it's not disabled, avoiding the 1-frame
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* delay. */
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s->frame = av_frame_clone(in);
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return ff_filter_frame(outlink, in);
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}
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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if (!s->frame) {
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s->frame = in;
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mode = PROGRESSIVE;
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} else {
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mode = analyze_plane(ctx, s->mode, s->frame, in);
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}
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for (plane = 0; plane < s->nb_planes; plane++) {
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const uint8_t *buf = s->frame->data[plane];
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const uint8_t *from = in->data[plane];
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uint8_t *to = out->data[plane];
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for (y = 0, top = 1; y < s->planeheight[plane]; y++, top ^= 1) {
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memcpy(to, mode == (top ? BOTTOM_FIRST : TOP_FIRST) ? buf : from, s->linesize[plane]);
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buf += s->frame->linesize[plane];
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from += in->linesize[plane];
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to += out->linesize[plane];
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}
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}
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if (in != s->frame)
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av_frame_free(&s->frame);
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s->frame = in;
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return ff_filter_frame(outlink, out);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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PhaseContext *s = ctx->priv;
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av_frame_free(&s->frame);
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}
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static const AVFilterPad phase_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad phase_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_phase = {
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.name = "phase",
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.description = NULL_IF_CONFIG_SMALL("Phase shift fields."),
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.priv_size = sizeof(PhaseContext),
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.priv_class = &phase_class,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = phase_inputs,
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.outputs = phase_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
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};
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