/*
* Copyright (c) 2002 Jindrich Makovicka <makovick@gmail.com>
* Copyright (c) 2011 Stefano Sabatini
*
* 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
* Ported from MPlayer libmpcodecs/vf_delogo.c.
*/
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
/**
* Apply a simple delogo algorithm to the image in dst and put the
* result in src.
*
* 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,
int logo_x, int logo_y, int logo_w, int logo_h,
int band, int show, int direct)
{
int x, y;
int interp, dist;
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;
dst += (logo_y1+1)*dst_linesize;
src += (logo_y1+1)*src_linesize;
if (!direct)
av_image_copy_plane(dst, dst_linesize, src, src_linesize, w, h);
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++) {
interp =
(topleft[src_linesize*(y-logo_y -yclipt)] +
topleft[src_linesize*(y-logo_y-1-yclipt)] +
topleft[src_linesize*(y-logo_y+1-yclipt)]) * (logo_w-(x-logo_x))/logo_w
+
(topright[src_linesize*(y-logo_y-yclipt)] +
topright[src_linesize*(y-logo_y-1-yclipt)] +
topright[src_linesize*(y-logo_y+1-yclipt)]) * (x-logo_x)/logo_w
+
(topleft[x-logo_x-xclipl] +
topleft[x-logo_x-1-xclipl] +
topleft[x-logo_x+1-xclipl]) * (logo_h-(y-logo_y))/logo_h
+
(botleft[x-logo_x-xclipl] +
botleft[x-logo_x-1-xclipl] +
botleft[x-logo_x+1-xclipl]) * (y-logo_y)/logo_h;
interp /= 6;
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)
static const AVOption delogo_options[]= {
{"x", "set logo x position", OFFSET(x), AV_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
{"y", "set logo y position", OFFSET(y), AV_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
{"w", "set logo width", OFFSET(w), AV_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
{"h", "set logo height", OFFSET(h), AV_OPT_TYPE_INT, {.dbl=-1}, -1, INT_MAX },
{"band", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, {.dbl= 4}, -1, INT_MAX },
{"t", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, {.dbl= 4}, -1, INT_MAX },
{"show", "show delogo area", OFFSET(show), AV_OPT_TYPE_INT, {.dbl= 0}, 0, 1 },
{NULL},
};
static const char *delogo_get_name(void *ctx)
{
return "delogo";
}
static const AVClass delogo_class = {
.class_name = "DelogoContext",
.item_name = delogo_get_name,
.option = delogo_options,
};
static int query_formats(AVFilterContext *ctx)
{
enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUV440P,
PIX_FMT_YUVA420P, PIX_FMT_GRAY8,
PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
DelogoContext *delogo = ctx->priv;
int ret = 0;
delogo->class = &delogo_class;
av_opt_set_defaults(delogo);
if (args)
ret = sscanf(args, "%d:%d:%d:%d:%d",
&delogo->x, &delogo->y, &delogo->w, &delogo->h, &delogo->band);
if (ret == 5) {
if (delogo->band < 0)
delogo->show = 1;
} else if ((ret = (av_set_options_string(delogo, args, "=", ":"))) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
return ret;
}
#define CHECK_UNSET_OPT(opt) \
if (delogo->opt == -1) { \
av_log(delogo, 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 (delogo->show)
delogo->band = 4;
av_log(ctx, AV_LOG_INFO, "x:%d y:%d, w:%d h:%d band:%d show:%d\n",
delogo->x, delogo->y, delogo->w, delogo->h, delogo->band, delogo->show);
delogo->w += delogo->band*2;
delogo->h += delogo->band*2;
delogo->x -= delogo->band;
delogo->y -= delogo->band;
return 0;
}
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *outpicref;
if (inpicref->perms & AV_PERM_PRESERVE) {
outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
outlink->w, outlink->h);
avfilter_copy_buffer_ref_props(outpicref, inpicref);
outpicref->video->w = outlink->w;
outpicref->video->h = outlink->h;
} else
outpicref = inpicref;
outlink->out_buf = outpicref;
avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
}
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
static void end_frame(AVFilterLink *inlink)
{
DelogoContext *delogo = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *inpicref = inlink ->cur_buf;
AVFilterBufferRef *outpicref = outlink->out_buf;
int direct = inpicref == outpicref;
int hsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
int vsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
int plane;
for (plane = 0; plane < 4 && inpicref->data[plane]; plane++) {
int hsub = plane == 1 || plane == 2 ? hsub0 : 0;
int vsub = plane == 1 || plane == 2 ? vsub0 : 0;
apply_delogo(outpicref->data[plane], outpicref->linesize[plane],
inpicref ->data[plane], inpicref ->linesize[plane],
inlink->w>>hsub, inlink->h>>vsub,
delogo->x>>hsub, delogo->y>>vsub,
delogo->w>>hsub, delogo->h>>vsub,
delogo->band>>FFMIN(hsub, vsub),
delogo->show, direct);
}
avfilter_draw_slice(outlink, 0, inlink->h, 1);
avfilter_end_frame(outlink);
avfilter_unref_buffer(inpicref);
if (!direct)
avfilter_unref_buffer(outpicref);
}
AVFilter avfilter_vf_delogo = {
.name = "delogo",
.description = NULL_IF_CONFIG_SMALL("Remove logo from input video."),
.priv_size = sizeof(DelogoContext),
.init = init,
.query_formats = query_formats,
.inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = avfilter_null_get_video_buffer,
.start_frame = start_frame,
.draw_slice = null_draw_slice,
.end_frame = end_frame,
.min_perms = AV_PERM_WRITE | AV_PERM_READ,
.rej_perms = AV_PERM_PRESERVE },
{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};