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FFmpeg4/libavfilter/vf_delogo.c

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/*
* Copyright (c) 2002 Jindrich Makovicka <makovick@gmail.com>
* Copyright (c) 2011 Stefano Sabatini
* Copyright (c) 2013, 2015 Jean Delvare <jdelvare@suse.com>
*
* 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 "libavutil/eval.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
static const char * const var_names[] = {
"x",
"y",
"w",
"h",
"n", ///< number of frame
"t", ///< timestamp expressed in seconds
NULL
};
enum var_name {
VAR_X,
VAR_Y,
VAR_W,
VAR_H,
VAR_N,
VAR_T,
VAR_VARS_NB
};
#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
{
int ret;
AVExpr *old = NULL;
if (*pexpr)
old = *pexpr;
ret = av_expr_parse(pexpr, expr, var_names, NULL, NULL, NULL, NULL, 0, log_ctx);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Error when parsing the expression '%s' for %s\n",
expr, option);
*pexpr = old;
return ret;
}
av_expr_free(old);
return 0;
}
/**
* 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,
unsigned int band, int show, int direct)
{
int x, y;
uint64_t interp, weightl, weightr, weightt, weightb, weight;
uint8_t *xdst, *xsrc;
uint8_t *topleft, *botleft, *topright;
unsigned int left_sample, right_sample;
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 - 1;
logo_y1 = logo_y + yclipt;
logo_y2 = logo_y + logo_h - yclipb - 1;
topleft = src+logo_y1 * src_linesize+logo_x1;
topright = src+logo_y1 * src_linesize+logo_x2;
botleft = src+logo_y2 * 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; y++) {
left_sample = topleft[src_linesize*(y-logo_y1)] +
topleft[src_linesize*(y-logo_y1-1)] +
topleft[src_linesize*(y-logo_y1+1)];
right_sample = topright[src_linesize*(y-logo_y1)] +
topright[src_linesize*(y-logo_y1-1)] +
topright[src_linesize*(y-logo_y1+1)];
for (x = logo_x1+1,
xdst = dst+logo_x1+1,
xsrc = src+logo_x1+1; x < logo_x2; x++, xdst++, xsrc++) {
if (show && (y == logo_y1+1 || y == logo_y2-1 ||
x == logo_x1+1 || x == logo_x2-1)) {
*xdst = 0;
continue;
}
/* Weighted interpolation based on relative distances, taking SAR into account */
weightl = (uint64_t) (logo_x2-x) * (y-logo_y1) * (logo_y2-y) * sar.den;
weightr = (uint64_t)(x-logo_x1) * (y-logo_y1) * (logo_y2-y) * sar.den;
weightt = (uint64_t)(x-logo_x1) * (logo_x2-x) * (logo_y2-y) * sar.num;
weightb = (uint64_t)(x-logo_x1) * (logo_x2-x) * (y-logo_y1) * sar.num;
interp =
left_sample * weightl
+
right_sample * 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;
weight = (weightl + weightr + weightt + weightb) * 3U;
interp = (interp + (weight >> 1)) / weight;
if (y >= logo_y+band && y < logo_y+logo_h-band &&
x >= logo_x+band && x < logo_x+logo_w-band) {
*xdst = interp;
} else {
unsigned 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;
}
}
dst += dst_linesize;
src += src_linesize;
}
}
typedef struct DelogoContext {
const AVClass *class;
int x, y, w, h, band, show;
char *x_expr, *y_expr, *w_expr, *h_expr;
AVExpr *x_pexpr, *y_pexpr, *w_pexpr, *h_pexpr;
double var_values[VAR_VARS_NB];
} 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_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
{ "y", "set logo y position", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
{ "w", "set logo width", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
{ "h", "set logo height", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
{ "show", "show delogo area", OFFSET(show), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(delogo);
static av_cold void uninit(AVFilterContext *ctx)
{
DelogoContext *s = ctx->priv;
av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
av_expr_free(s->w_pexpr); s->w_pexpr = NULL;
av_expr_free(s->h_pexpr); s->h_pexpr = NULL;
}
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
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
static av_cold int init(AVFilterContext *ctx)
{
DelogoContext *s = ctx->priv;
int ret = 0;
if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
(ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0 ||
(ret = set_expr(&s->w_pexpr, s->w_expr, "w", ctx)) < 0 ||
(ret = set_expr(&s->h_pexpr, s->h_expr, "h", ctx)) < 0 )
return ret;
s->x = av_expr_eval(s->x_pexpr, s->var_values, s);
s->y = av_expr_eval(s->y_pexpr, s->var_values, s);
s->w = av_expr_eval(s->w_pexpr, s->var_values, s);
s->h = av_expr_eval(s->h_pexpr, s->var_values, s);
#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);
s->band = 1;
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 config_input(AVFilterLink *inlink)
{
DelogoContext *s = inlink->dst->priv;
/* Check whether the logo area fits in the frame */
if (s->x + (s->band - 1) < 0 || s->x + s->w - (s->band*2 - 2) > inlink->w ||
s->y + (s->band - 1) < 0 || s->y + s->h - (s->band*2 - 2) > inlink->h) {
av_log(s, AV_LOG_ERROR, "Logo area is outside of the frame.\n");
return AVERROR(EINVAL);
}
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;
int ret;
s->var_values[VAR_N] = inlink->frame_count_out;
s->var_values[VAR_T] = TS2T(in->pts, inlink->time_base);
s->x = av_expr_eval(s->x_pexpr, s->var_values, s);
s->y = av_expr_eval(s->y_pexpr, s->var_values, s);
s->w = av_expr_eval(s->w_pexpr, s->var_values, s);
s->h = av_expr_eval(s->h_pexpr, s->var_values, s);
if (s->x + (s->band - 1) <= 0 || s->x + s->w - (s->band*2 - 2) > inlink->w ||
s->y + (s->band - 1) <= 0 || s->y + s->h - (s->band*2 - 2) > inlink->h) {
av_log(s, AV_LOG_WARNING, "Logo area is outside of the frame,"
" auto set the area inside of the frame\n");
}
if (s->x + (s->band - 1) <= 0)
s->x = 1 + s->band;
if (s->y + (s->band - 1) <= 0)
s->y = 1 + s->band;
if (s->x + s->w - (s->band*2 - 2) > inlink->w)
s->w = inlink->w - s->x - (s->band*2 - 2);
if (s->y + s->h - (s->band*2 - 2) > inlink->h)
s->h = inlink->h - s->y - (s->band*2 - 2);
ret = config_input(inlink);
if (ret < 0) {
av_frame_free(&in);
return ret;
}
s->w += s->band*2;
s->h += s->band*2;
s->x -= s->band;
s->y -= s->band;
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 < desc->nb_components; 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],
AV_CEIL_RSHIFT(inlink->w, hsub),
AV_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 */
AV_CEIL_RSHIFT(s->w + (s->x & ((1<<hsub)-1)), hsub),
AV_CEIL_RSHIFT(s->h + (s->y & ((1<<vsub)-1)), vsub),
s->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,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_delogo_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_delogo = {
.name = "delogo",
.description = NULL_IF_CONFIG_SMALL("Remove logo from input video."),
.priv_size = sizeof(DelogoContext),
.priv_class = &delogo_class,
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = avfilter_vf_delogo_inputs,
.outputs = avfilter_vf_delogo_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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