289 lines
10 KiB
C
289 lines
10 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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*
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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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* Ported from MPlayer libmpcodecs/vf_delogo.c.
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*/
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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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/**
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* Apply a simple delogo algorithm to the image in dst and put the
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* result in src.
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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,
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int logo_x, int logo_y, int logo_w, int logo_h,
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int band, int show, int direct)
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{
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int x, y;
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int interp, dist;
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uint8_t *xdst, *xsrc;
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uint8_t *topleft, *botleft, *topright;
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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;
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logo_y1 = logo_y + yclipt;
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logo_y2 = logo_y + logo_h - yclipb;
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topleft = src+logo_y1 * src_linesize+logo_x1;
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topright = src+logo_y1 * src_linesize+logo_x2-1;
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botleft = src+(logo_y2-1) * src_linesize+logo_x1;
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dst += (logo_y1+1)*dst_linesize;
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src += (logo_y1+1)*src_linesize;
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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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for (y = logo_y1+1; y < logo_y2-1; y++) {
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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_x2-1; x++, xdst++, xsrc++) {
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interp =
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(topleft[src_linesize*(y-logo_y -yclipt)] +
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topleft[src_linesize*(y-logo_y-1-yclipt)] +
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topleft[src_linesize*(y-logo_y+1-yclipt)]) * (logo_w-(x-logo_x))/logo_w
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+
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(topright[src_linesize*(y-logo_y-yclipt)] +
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topright[src_linesize*(y-logo_y-1-yclipt)] +
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topright[src_linesize*(y-logo_y+1-yclipt)]) * (x-logo_x)/logo_w
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+
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(topleft[x-logo_x-xclipl] +
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topleft[x-logo_x-1-xclipl] +
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topleft[x-logo_x+1-xclipl]) * (logo_h-(y-logo_y))/logo_h
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+
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(botleft[x-logo_x-xclipl] +
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botleft[x-logo_x-1-xclipl] +
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botleft[x-logo_x+1-xclipl]) * (y-logo_y)/logo_h;
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interp /= 6;
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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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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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if (show && (dist == band-1))
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*xdst = 0;
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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 {
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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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static const AVOption delogo_options[]= {
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{"x", "set logo x position", OFFSET(x), FF_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
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{"y", "set logo y position", OFFSET(y), FF_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
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{"w", "set logo width", OFFSET(w), FF_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
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{"h", "set logo height", OFFSET(h), FF_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
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{"band", "set delogo area band size", OFFSET(band), FF_OPT_TYPE_INT, {.dbl= 4}, -1, INT_MAX },
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{"t", "set delogo area band size", OFFSET(band), FF_OPT_TYPE_INT, {.dbl= 4}, -1, INT_MAX },
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{"show", "show delogo area", OFFSET(show), FF_OPT_TYPE_INT, {.dbl= 0}, 0, 1 },
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{NULL},
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};
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static const char *delogo_get_name(void *ctx)
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{
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return "delogo";
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}
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static const AVClass delogo_class = {
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"DelogoContext",
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delogo_get_name,
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delogo_options
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};
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static int query_formats(AVFilterContext *ctx)
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{
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enum PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
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PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUV440P,
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PIX_FMT_YUVA420P, PIX_FMT_GRAY8,
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PIX_FMT_NONE
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};
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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DelogoContext *delogo = ctx->priv;
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int ret = 0;
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delogo->class = &delogo_class;
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av_opt_set_defaults2(delogo, 0, 0);
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if (args)
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ret = sscanf(args, "%d:%d:%d:%d:%d",
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&delogo->x, &delogo->y, &delogo->w, &delogo->h, &delogo->band);
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if (ret == 5) {
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if (delogo->band < 0)
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delogo->show = 1;
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} else if ((ret = (av_set_options_string(delogo, args, "=", ":"))) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
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return ret;
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}
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#define CHECK_UNSET_OPT(opt) \
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if (delogo->opt == -1) { \
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av_log(delogo, 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 (delogo->show)
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delogo->band = 4;
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av_log(ctx, AV_LOG_INFO, "x:%d y:%d, w:%d h:%d band:%d show:%d\n",
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delogo->x, delogo->y, delogo->w, delogo->h, delogo->band, delogo->show);
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delogo->w += delogo->band*2;
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delogo->h += delogo->band*2;
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delogo->x -= delogo->band;
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delogo->y -= delogo->band;
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return 0;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *outpicref;
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if (inpicref->perms & AV_PERM_PRESERVE) {
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outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
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outlink->w, outlink->h);
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avfilter_copy_buffer_ref_props(outpicref, inpicref);
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outpicref->video->w = outlink->w;
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outpicref->video->h = outlink->h;
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} else
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outpicref = inpicref;
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outlink->out_buf = outpicref;
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avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
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}
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static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
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static void end_frame(AVFilterLink *inlink)
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{
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DelogoContext *delogo = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *inpicref = inlink ->cur_buf;
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AVFilterBufferRef *outpicref = outlink->out_buf;
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int direct = inpicref == outpicref;
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int hsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
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int vsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
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int plane;
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for (plane = 0; plane < 4 && inpicref->data[plane]; 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(outpicref->data[plane], outpicref->linesize[plane],
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inpicref ->data[plane], inpicref ->linesize[plane],
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inlink->w>>hsub, inlink->h>>vsub,
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delogo->x>>hsub, delogo->y>>vsub,
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delogo->w>>hsub, delogo->h>>vsub,
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delogo->band>>FFMIN(hsub, vsub),
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delogo->show, direct);
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}
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avfilter_draw_slice(outlink, 0, inlink->h, 1);
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avfilter_end_frame(outlink);
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avfilter_unref_buffer(inpicref);
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if (!direct)
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avfilter_unref_buffer(outpicref);
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}
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AVFilter avfilter_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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.init = init,
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.start_frame = start_frame,
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.draw_slice = null_draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_WRITE | AV_PERM_READ,
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.rej_perms = AV_PERM_PRESERVE },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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