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395 lines
13 KiB
395 lines
13 KiB
/* |
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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 "libavutil/eval.h" |
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#include "avfilter.h" |
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#include "filters.h" |
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#include "video.h" |
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static const char * const var_names[] = { |
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"x", |
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"y", |
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"w", |
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"h", |
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"n", ///< number of frame |
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"t", ///< timestamp expressed in seconds |
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NULL |
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}; |
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enum var_name { |
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VAR_X, |
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VAR_Y, |
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VAR_W, |
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VAR_H, |
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VAR_N, |
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VAR_T, |
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VAR_VARS_NB |
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}; |
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static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx) |
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{ |
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int ret; |
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AVExpr *old = NULL; |
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if (*pexpr) |
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old = *pexpr; |
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ret = av_expr_parse(pexpr, expr, var_names, NULL, NULL, NULL, NULL, 0, log_ctx); |
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if (ret < 0) { |
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av_log(log_ctx, AV_LOG_ERROR, |
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"Error when parsing the expression '%s' for %s\n", |
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expr, option); |
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*pexpr = old; |
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return ret; |
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} |
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av_expr_free(old); |
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return 0; |
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} |
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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 = (interp + (weight >> 1)) / 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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char *x_expr, *y_expr, *w_expr, *h_expr; |
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AVExpr *x_pexpr, *y_pexpr, *w_pexpr, *h_pexpr; |
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double var_values[VAR_VARS_NB]; |
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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_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS }, |
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{ "y", "set logo y position", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS }, |
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{ "w", "set logo width", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS }, |
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{ "h", "set logo height", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS }, |
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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 av_cold void uninit(AVFilterContext *ctx) |
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{ |
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DelogoContext *s = ctx->priv; |
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av_expr_free(s->x_pexpr); s->x_pexpr = NULL; |
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av_expr_free(s->y_pexpr); s->y_pexpr = NULL; |
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av_expr_free(s->w_pexpr); s->w_pexpr = NULL; |
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av_expr_free(s->h_pexpr); s->h_pexpr = NULL; |
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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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static av_cold int init(AVFilterContext *ctx) |
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{ |
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DelogoContext *s = ctx->priv; |
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int ret = 0; |
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if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 || |
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(ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0 || |
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(ret = set_expr(&s->w_pexpr, s->w_expr, "w", ctx)) < 0 || |
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(ret = set_expr(&s->h_pexpr, s->h_expr, "h", ctx)) < 0 ) |
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return ret; |
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s->x = av_expr_eval(s->x_pexpr, s->var_values, s); |
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s->y = av_expr_eval(s->y_pexpr, s->var_values, s); |
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s->w = av_expr_eval(s->w_pexpr, s->var_values, s); |
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s->h = av_expr_eval(s->h_pexpr, s->var_values, s); |
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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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s->band = 1; |
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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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FilterLink *inl = ff_filter_link(inlink); |
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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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int ret; |
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s->var_values[VAR_N] = inl->frame_count_out; |
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s->var_values[VAR_T] = TS2T(in->pts, inlink->time_base); |
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s->x = av_expr_eval(s->x_pexpr, s->var_values, s); |
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s->y = av_expr_eval(s->y_pexpr, s->var_values, s); |
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s->w = av_expr_eval(s->w_pexpr, s->var_values, s); |
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s->h = av_expr_eval(s->h_pexpr, s->var_values, s); |
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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_WARNING, "Logo area is outside of the frame," |
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" auto set the area inside of the frame\n"); |
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} |
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if (s->x + (s->band - 1) <= 0) |
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s->x = 1 + s->band; |
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if (s->y + (s->band - 1) <= 0) |
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s->y = 1 + s->band; |
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if (s->x + s->w - (s->band*2 - 2) > inlink->w) |
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s->w = inlink->w - s->x - (s->band*2 - 2); |
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if (s->y + s->h - (s->band*2 - 2) > inlink->h) |
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s->h = inlink->h - s->y - (s->band*2 - 2); |
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ret = config_input(inlink); |
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if (ret < 0) { |
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av_frame_free(&in); |
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return ret; |
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} |
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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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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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}; |
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const 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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.uninit = uninit, |
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FILTER_INPUTS(avfilter_vf_delogo_inputs), |
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FILTER_OUTPUTS(ff_video_default_filterpad), |
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FILTER_PIXFMTS_ARRAY(pix_fmts), |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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};
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