generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
50e66726a2
ffmpeg/libavfilter/vf_delogo.c
Clément Bœsch 50e66726a2 lavfi: use ceil right shift for chroma width/height. 
This should fix several issues with odd dimensions inputs.

lut, vflip, pad and crop video filters also need to be checked for such
issues. It's possible sws is also affected.
2013-05-10 17:20:06 +02:00

276 lines
9.3 KiB
C
Raw Blame History

/*
* 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/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 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;
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++) {
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)
#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 *delogo = ctx->priv;
#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->band < 0 || delogo->show) {
delogo->show = 1;
delogo->band = 4;
}
av_log(ctx, AV_LOG_VERBOSE, "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 int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
DelogoContext *delogo = 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;
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);
}
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),
delogo->x>>hsub, delogo->y>>vsub,
FF_CEIL_RSHIFT(delogo->w, hsub),
FF_CEIL_RSHIFT(delogo->h, vsub),
delogo->band>>FFMIN(hsub, vsub),
delogo->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,
};
Reference in New Issue View Git Blame Copy Permalink