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![Jean Delvare](/assets/img/avatar_default.png)
We can only remove the logo if it is inside the picture. We need at least one pixel around the logo area for interpolation. Fixes ticket #5527 (Delogo crash with x=0 and/or y=0). Signed-off-by: Jean Delvare <jdelvare@suse.com> Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
325 lines
11 KiB
C
325 lines
11 KiB
C
/*
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* Copyright (c) 2002 Jindrich Makovicka <makovick@gmail.com>
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2013, 2015 Jean Delvare <jdelvare@suse.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* A very simple tv station logo remover
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* Originally imported from MPlayer libmpcodecs/vf_delogo.c,
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* the algorithm was later improved.
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*/
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#include "libavutil/common.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.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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/**
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* Apply a simple delogo algorithm to the image in src and put the
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* result in dst.
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*
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* The algorithm is only applied to the region specified by the logo
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* parameters.
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*
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* @param w width of the input image
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* @param h height of the input image
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* @param logo_x x coordinate of the top left corner of the logo region
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* @param logo_y y coordinate of the top left corner of the logo region
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* @param logo_w width of the logo
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* @param logo_h height of the logo
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* @param band the size of the band around the processed area
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* @param show show a rectangle around the processed area, useful for
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* parameters tweaking
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* @param direct if non-zero perform in-place processing
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*/
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static void apply_delogo(uint8_t *dst, int dst_linesize,
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uint8_t *src, int src_linesize,
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int w, int h, AVRational sar,
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int logo_x, int logo_y, int logo_w, int logo_h,
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unsigned int band, int show, int direct)
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{
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int x, y;
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uint64_t interp, weightl, weightr, weightt, weightb, weight;
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uint8_t *xdst, *xsrc;
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uint8_t *topleft, *botleft, *topright;
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unsigned int left_sample, right_sample;
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int xclipl, xclipr, yclipt, yclipb;
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int logo_x1, logo_x2, logo_y1, logo_y2;
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xclipl = FFMAX(-logo_x, 0);
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xclipr = FFMAX(logo_x+logo_w-w, 0);
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yclipt = FFMAX(-logo_y, 0);
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yclipb = FFMAX(logo_y+logo_h-h, 0);
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logo_x1 = logo_x + xclipl;
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logo_x2 = logo_x + logo_w - xclipr - 1;
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logo_y1 = logo_y + yclipt;
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logo_y2 = logo_y + logo_h - yclipb - 1;
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topleft = src+logo_y1 * src_linesize+logo_x1;
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topright = src+logo_y1 * src_linesize+logo_x2;
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botleft = src+logo_y2 * src_linesize+logo_x1;
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if (!direct)
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av_image_copy_plane(dst, dst_linesize, src, src_linesize, w, h);
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dst += (logo_y1 + 1) * dst_linesize;
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src += (logo_y1 + 1) * src_linesize;
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for (y = logo_y1+1; y < logo_y2; y++) {
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left_sample = topleft[src_linesize*(y-logo_y1)] +
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topleft[src_linesize*(y-logo_y1-1)] +
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topleft[src_linesize*(y-logo_y1+1)];
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right_sample = topright[src_linesize*(y-logo_y1)] +
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topright[src_linesize*(y-logo_y1-1)] +
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topright[src_linesize*(y-logo_y1+1)];
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for (x = logo_x1+1,
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xdst = dst+logo_x1+1,
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xsrc = src+logo_x1+1; x < logo_x2; x++, xdst++, xsrc++) {
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if (show && (y == logo_y1+1 || y == logo_y2-1 ||
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x == logo_x1+1 || x == logo_x2-1)) {
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*xdst = 0;
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continue;
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}
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/* Weighted interpolation based on relative distances, taking SAR into account */
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weightl = (uint64_t) (logo_x2-x) * (y-logo_y1) * (logo_y2-y) * sar.den;
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weightr = (uint64_t)(x-logo_x1) * (y-logo_y1) * (logo_y2-y) * sar.den;
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weightt = (uint64_t)(x-logo_x1) * (logo_x2-x) * (logo_y2-y) * sar.num;
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weightb = (uint64_t)(x-logo_x1) * (logo_x2-x) * (y-logo_y1) * sar.num;
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interp =
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left_sample * weightl
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+
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right_sample * weightr
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+
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(topleft[x-logo_x1] +
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topleft[x-logo_x1-1] +
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topleft[x-logo_x1+1]) * weightt
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+
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(botleft[x-logo_x1] +
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botleft[x-logo_x1-1] +
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botleft[x-logo_x1+1]) * weightb;
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weight = (weightl + weightr + weightt + weightb) * 3U;
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interp = ROUNDED_DIV(interp, weight);
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if (y >= logo_y+band && y < logo_y+logo_h-band &&
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x >= logo_x+band && x < logo_x+logo_w-band) {
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*xdst = interp;
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} else {
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unsigned dist = 0;
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if (x < logo_x+band)
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dist = FFMAX(dist, logo_x-x+band);
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else if (x >= logo_x+logo_w-band)
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dist = FFMAX(dist, x-(logo_x+logo_w-1-band));
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if (y < logo_y+band)
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dist = FFMAX(dist, logo_y-y+band);
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else if (y >= logo_y+logo_h-band)
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dist = FFMAX(dist, y-(logo_y+logo_h-1-band));
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*xdst = (*xsrc*dist + interp*(band-dist))/band;
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}
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}
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dst += dst_linesize;
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src += src_linesize;
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}
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}
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typedef struct DelogoContext {
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const AVClass *class;
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int x, y, w, h, band, show;
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} DelogoContext;
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#define OFFSET(x) offsetof(DelogoContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption delogo_options[]= {
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{ "x", "set logo x position", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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{ "y", "set logo y position", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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{ "w", "set logo width", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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{ "h", "set logo height", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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#if LIBAVFILTER_VERSION_MAJOR < 7
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/* Actual default value for band/t is 1, set in init */
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{ "band", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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{ "t", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
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#endif
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{ "show", "show delogo area", OFFSET(show), AV_OPT_TYPE_BOOL,{ .i64 = 0 }, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(delogo);
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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_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVA420P, AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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DelogoContext *s = ctx->priv;
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#define CHECK_UNSET_OPT(opt) \
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if (s->opt == -1) { \
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av_log(s, AV_LOG_ERROR, "Option %s was not set.\n", #opt); \
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return AVERROR(EINVAL); \
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}
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CHECK_UNSET_OPT(x);
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CHECK_UNSET_OPT(y);
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CHECK_UNSET_OPT(w);
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CHECK_UNSET_OPT(h);
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#if LIBAVFILTER_VERSION_MAJOR < 7
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if (s->band == 0) { /* Unset, use default */
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av_log(ctx, AV_LOG_WARNING, "Note: default band value was changed from 4 to 1.\n");
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s->band = 1;
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} else if (s->band != 1) {
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av_log(ctx, AV_LOG_WARNING, "Option band is deprecated.\n");
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}
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#else
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s->band = 1;
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#endif
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av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d, w:%d h:%d band:%d show:%d\n",
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s->x, s->y, s->w, s->h, s->band, s->show);
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s->w += s->band*2;
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s->h += s->band*2;
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s->x -= s->band;
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s->y -= s->band;
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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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DelogoContext *s = inlink->dst->priv;
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/* Check whether the logo area fits in the frame */
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if (s->x + (s->band - 1) < 0 || s->x + s->w - (s->band*2 - 2) > inlink->w ||
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s->y + (s->band - 1) < 0 || s->y + s->h - (s->band*2 - 2) > inlink->h) {
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av_log(s, AV_LOG_ERROR, "Logo area is outside of the frame.\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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DelogoContext *s = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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AVFrame *out;
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int hsub0 = desc->log2_chroma_w;
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int vsub0 = desc->log2_chroma_h;
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int direct = 0;
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int plane;
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AVRational sar;
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if (av_frame_is_writable(in)) {
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direct = 1;
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out = in;
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} else {
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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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}
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sar = in->sample_aspect_ratio;
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/* Assume square pixels if SAR is unknown */
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if (!sar.num)
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sar.num = sar.den = 1;
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for (plane = 0; plane < desc->nb_components; plane++) {
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int hsub = plane == 1 || plane == 2 ? hsub0 : 0;
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int vsub = plane == 1 || plane == 2 ? vsub0 : 0;
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apply_delogo(out->data[plane], out->linesize[plane],
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in ->data[plane], in ->linesize[plane],
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AV_CEIL_RSHIFT(inlink->w, hsub),
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AV_CEIL_RSHIFT(inlink->h, vsub),
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sar, s->x>>hsub, s->y>>vsub,
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/* Up and left borders were rounded down, inject lost bits
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* into width and height to avoid error accumulation */
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AV_CEIL_RSHIFT(s->w + (s->x & ((1<<hsub)-1)), hsub),
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AV_CEIL_RSHIFT(s->h + (s->y & ((1<<vsub)-1)), vsub),
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s->band>>FFMIN(hsub, vsub),
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s->show, direct);
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}
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if (!direct)
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static const AVFilterPad avfilter_vf_delogo_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 avfilter_vf_delogo_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_delogo = {
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.name = "delogo",
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.description = NULL_IF_CONFIG_SMALL("Remove logo from input video."),
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.priv_size = sizeof(DelogoContext),
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.priv_class = &delogo_class,
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.init = init,
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.query_formats = query_formats,
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.inputs = avfilter_vf_delogo_inputs,
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.outputs = avfilter_vf_delogo_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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