a5e8c41c28
It is not used in any filters currently and is inherently evil. If passing binary data to filters is required in the future, it should be done with some AVOptions-based system.
288 lines
10 KiB
C
288 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#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 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 = (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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+ (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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+ (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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+ (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, {-1}, -1, INT_MAX },
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{"y", "set logo y position", OFFSET(y), FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
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{"w", "set logo width", OFFSET(w), FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
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{"h", "set logo height", OFFSET(h), FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
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{"band", "set delogo area band size", OFFSET(band), FF_OPT_TYPE_INT, { 4}, -1, INT_MAX },
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{"t", "set delogo area band size", OFFSET(band), FF_OPT_TYPE_INT, { 4}, -1, INT_MAX },
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{"show", "show delogo area", OFFSET(show), FF_OPT_TYPE_INT, { 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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.class_name = "DelogoContext",
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.item_name = delogo_get_name,
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.option = 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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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 av_cold int init(AVFilterContext *ctx, const char *args)
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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_defaults(delogo);
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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_DEBUG, "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 = ff_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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ff_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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ff_draw_slice(outlink, 0, inlink->h, 1);
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ff_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 = ff_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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