/* * Copyright (c) 2002 Jindrich Makovicka * Copyright (c) 2011 Stefano Sabatini * Copyright (c) 2013 Jean Delvare * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with FFmpeg; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /** * @file * A very simple tv station logo remover * Originally imported from MPlayer libmpcodecs/vf_delogo.c, * the algorithm was later improved. */ #include "libavutil/common.h" #include "libavutil/imgutils.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" /** * Apply a simple delogo algorithm to the image in src and put the * result in dst. * * The algorithm is only applied to the region specified by the logo * parameters. * * @param w width of the input image * @param h height of the input image * @param logo_x x coordinate of the top left corner of the logo region * @param logo_y y coordinate of the top left corner of the logo region * @param logo_w width of the logo * @param logo_h height of the logo * @param band the size of the band around the processed area * @param show show a rectangle around the processed area, useful for * parameters tweaking * @param direct if non-zero perform in-place processing */ static void apply_delogo(uint8_t *dst, int dst_linesize, uint8_t *src, int src_linesize, int w, int h, AVRational sar, int logo_x, int logo_y, int logo_w, int logo_h, int band, int show, int direct) { int x, y, dist; uint64_t interp, weightl, weightr, weightt, weightb; uint8_t *xdst, *xsrc; uint8_t *topleft, *botleft, *topright; int xclipl, xclipr, yclipt, yclipb; int logo_x1, logo_x2, logo_y1, logo_y2; xclipl = FFMAX(-logo_x, 0); xclipr = FFMAX(logo_x+logo_w-w, 0); yclipt = FFMAX(-logo_y, 0); yclipb = FFMAX(logo_y+logo_h-h, 0); logo_x1 = logo_x + xclipl; logo_x2 = logo_x + logo_w - xclipr; logo_y1 = logo_y + yclipt; logo_y2 = logo_y + logo_h - yclipb; topleft = src+logo_y1 * src_linesize+logo_x1; topright = src+logo_y1 * src_linesize+logo_x2-1; botleft = src+(logo_y2-1) * src_linesize+logo_x1; if (!direct) av_image_copy_plane(dst, dst_linesize, src, src_linesize, w, h); dst += (logo_y1 + 1) * dst_linesize; src += (logo_y1 + 1) * src_linesize; for (y = logo_y1+1; y < logo_y2-1; y++) { for (x = logo_x1+1, xdst = dst+logo_x1+1, xsrc = src+logo_x1+1; x < logo_x2-1; x++, xdst++, xsrc++) { /* Weighted interpolation based on relative distances, taking SAR into account */ weightl = (uint64_t) (logo_x2-1-x) * (y-logo_y1) * (logo_y2-1-y) * sar.den; weightr = (uint64_t)(x-logo_x1) * (y-logo_y1) * (logo_y2-1-y) * sar.den; weightt = (uint64_t)(x-logo_x1) * (logo_x2-1-x) * (logo_y2-1-y) * sar.num; weightb = (uint64_t)(x-logo_x1) * (logo_x2-1-x) * (y-logo_y1) * sar.num; interp = (topleft[src_linesize*(y-logo_y1)] + topleft[src_linesize*(y-logo_y1-1)] + topleft[src_linesize*(y-logo_y1+1)]) * weightl + (topright[src_linesize*(y-logo_y1)] + topright[src_linesize*(y-logo_y1-1)] + topright[src_linesize*(y-logo_y1+1)]) * weightr + (topleft[x-logo_x1] + topleft[x-logo_x1-1] + topleft[x-logo_x1+1]) * weightt + (botleft[x-logo_x1] + botleft[x-logo_x1-1] + botleft[x-logo_x1+1]) * weightb; interp /= (weightl + weightr + weightt + weightb) * 3U; if (y >= logo_y+band && y < logo_y+logo_h-band && x >= logo_x+band && x < logo_x+logo_w-band) { *xdst = interp; } else { dist = 0; if (x < logo_x+band) dist = FFMAX(dist, logo_x-x+band); else if (x >= logo_x+logo_w-band) dist = FFMAX(dist, x-(logo_x+logo_w-1-band)); if (y < logo_y+band) dist = FFMAX(dist, logo_y-y+band); else if (y >= logo_y+logo_h-band) dist = FFMAX(dist, y-(logo_y+logo_h-1-band)); *xdst = (*xsrc*dist + interp*(band-dist))/band; if (show && (dist == band-1)) *xdst = 0; } } dst += dst_linesize; src += src_linesize; } } typedef struct { const AVClass *class; int x, y, w, h, band, show; } DelogoContext; #define OFFSET(x) offsetof(DelogoContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption delogo_options[]= { { "x", "set logo x position", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, { "y", "set logo y position", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, { "w", "set logo width", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, { "h", "set logo height", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, { "band", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 4 }, -1, INT_MAX, FLAGS }, { "t", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 4 }, -1, INT_MAX, FLAGS }, { "show", "show delogo area", OFFSET(show), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS }, { NULL }, }; AVFILTER_DEFINE_CLASS(delogo); static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } static av_cold int init(AVFilterContext *ctx) { DelogoContext *s = ctx->priv; #define CHECK_UNSET_OPT(opt) \ if (s->opt == -1) { \ av_log(s, AV_LOG_ERROR, "Option %s was not set.\n", #opt); \ return AVERROR(EINVAL); \ } CHECK_UNSET_OPT(x); CHECK_UNSET_OPT(y); CHECK_UNSET_OPT(w); CHECK_UNSET_OPT(h); if (s->band < 0 || s->show) { s->show = 1; s->band = 4; } av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d, w:%d h:%d band:%d show:%d\n", s->x, s->y, s->w, s->h, s->band, s->show); s->w += s->band*2; s->h += s->band*2; s->x -= s->band; s->y -= s->band; return 0; } static int filter_frame(AVFilterLink *inlink, AVFrame *in) { DelogoContext *s = inlink->dst->priv; AVFilterLink *outlink = inlink->dst->outputs[0]; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); AVFrame *out; int hsub0 = desc->log2_chroma_w; int vsub0 = desc->log2_chroma_h; int direct = 0; int plane; AVRational sar; if (av_frame_is_writable(in)) { direct = 1; out = in; } else { out = ff_get_video_buffer(outlink, outlink->w, outlink->h); if (!out) { av_frame_free(&in); return AVERROR(ENOMEM); } av_frame_copy_props(out, in); } sar = in->sample_aspect_ratio; /* Assume square pixels if SAR is unknown */ if (!sar.num) sar.num = sar.den = 1; for (plane = 0; plane < 4 && in->data[plane]; plane++) { int hsub = plane == 1 || plane == 2 ? hsub0 : 0; int vsub = plane == 1 || plane == 2 ? vsub0 : 0; apply_delogo(out->data[plane], out->linesize[plane], in ->data[plane], in ->linesize[plane], FF_CEIL_RSHIFT(inlink->w, hsub), FF_CEIL_RSHIFT(inlink->h, vsub), sar, s->x>>hsub, s->y>>vsub, /* Up and left borders were rounded down, inject lost bits * into width and height to avoid error accumulation */ FF_CEIL_RSHIFT(s->w + (s->x & ((1<h + (s->y & ((1<band>>FFMIN(hsub, vsub), s->show, direct); } if (!direct) av_frame_free(&in); return ff_filter_frame(outlink, out); } static const AVFilterPad avfilter_vf_delogo_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .get_video_buffer = ff_null_get_video_buffer, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad avfilter_vf_delogo_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter avfilter_vf_delogo = { .name = "delogo", .description = NULL_IF_CONFIG_SMALL("Remove logo from input video."), .priv_size = sizeof(DelogoContext), .priv_class = &delogo_class, .init = init, .query_formats = query_formats, .inputs = avfilter_vf_delogo_inputs, .outputs = avfilter_vf_delogo_outputs, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, };