Libav
vf_delogo.c
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1 /*
2  * Copyright (c) 2002 Jindrich Makovicka <makovick@gmail.com>
3  * Copyright (c) 2011 Stefano Sabatini
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with Libav; if not, write to the Free Software Foundation, Inc.,
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20  */
21 
28 #include "libavutil/common.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/pixdesc.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35 #include "video.h"
36 
55 static void apply_delogo(uint8_t *dst, int dst_linesize,
56  uint8_t *src, int src_linesize,
57  int w, int h,
58  int logo_x, int logo_y, int logo_w, int logo_h,
59  int band, int show, int direct)
60 {
61  int x, y;
62  int interp, dist;
63  uint8_t *xdst, *xsrc;
64 
65  uint8_t *topleft, *botleft, *topright;
66  int xclipl, xclipr, yclipt, yclipb;
67  int logo_x1, logo_x2, logo_y1, logo_y2;
68 
69  xclipl = FFMAX(-logo_x, 0);
70  xclipr = FFMAX(logo_x+logo_w-w, 0);
71  yclipt = FFMAX(-logo_y, 0);
72  yclipb = FFMAX(logo_y+logo_h-h, 0);
73 
74  logo_x1 = logo_x + xclipl;
75  logo_x2 = logo_x + logo_w - xclipr;
76  logo_y1 = logo_y + yclipt;
77  logo_y2 = logo_y + logo_h - yclipb;
78 
79  topleft = src+logo_y1 * src_linesize+logo_x1;
80  topright = src+logo_y1 * src_linesize+logo_x2-1;
81  botleft = src+(logo_y2-1) * src_linesize+logo_x1;
82 
83  if (!direct)
84  av_image_copy_plane(dst, dst_linesize, src, src_linesize, w, h);
85 
86  dst += (logo_y1 + 1) * dst_linesize;
87  src += (logo_y1 + 1) * src_linesize;
88 
89  for (y = logo_y1+1; y < logo_y2-1; y++) {
90  for (x = logo_x1+1,
91  xdst = dst+logo_x1+1,
92  xsrc = src+logo_x1+1; x < logo_x2-1; x++, xdst++, xsrc++) {
93  interp = (topleft[src_linesize*(y-logo_y -yclipt)] +
94  topleft[src_linesize*(y-logo_y-1-yclipt)] +
95  topleft[src_linesize*(y-logo_y+1-yclipt)]) * (logo_w-(x-logo_x))/logo_w
96  + (topright[src_linesize*(y-logo_y-yclipt)] +
97  topright[src_linesize*(y-logo_y-1-yclipt)] +
98  topright[src_linesize*(y-logo_y+1-yclipt)]) * (x-logo_x)/logo_w
99  + (topleft[x-logo_x-xclipl] +
100  topleft[x-logo_x-1-xclipl] +
101  topleft[x-logo_x+1-xclipl]) * (logo_h-(y-logo_y))/logo_h
102  + (botleft[x-logo_x-xclipl] +
103  botleft[x-logo_x-1-xclipl] +
104  botleft[x-logo_x+1-xclipl]) * (y-logo_y)/logo_h;
105  interp /= 6;
106 
107  if (y >= logo_y+band && y < logo_y+logo_h-band &&
108  x >= logo_x+band && x < logo_x+logo_w-band) {
109  *xdst = interp;
110  } else {
111  dist = 0;
112  if (x < logo_x+band)
113  dist = FFMAX(dist, logo_x-x+band);
114  else if (x >= logo_x+logo_w-band)
115  dist = FFMAX(dist, x-(logo_x+logo_w-1-band));
116 
117  if (y < logo_y+band)
118  dist = FFMAX(dist, logo_y-y+band);
119  else if (y >= logo_y+logo_h-band)
120  dist = FFMAX(dist, y-(logo_y+logo_h-1-band));
121 
122  *xdst = (*xsrc*dist + interp*(band-dist))/band;
123  if (show && (dist == band-1))
124  *xdst = 0;
125  }
126  }
127 
128  dst += dst_linesize;
129  src += src_linesize;
130  }
131 }
132 
133 typedef struct {
134  const AVClass *class;
135  int x, y, w, h, band, show;
136 } DelogoContext;
137 
138 #define OFFSET(x) offsetof(DelogoContext, x)
139 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
140 
141 static const AVOption delogo_options[]= {
142  { "x", "set logo x position", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
143  { "y", "set logo y position", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
144  { "w", "set logo width", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
145  { "h", "set logo height", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
146  { "band", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 4 }, -1, INT_MAX, FLAGS },
147  { "t", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 4 }, -1, INT_MAX, FLAGS },
148  { "show", "show delogo area", OFFSET(show), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
149  { NULL },
150 };
151 
152 static const char *delogo_get_name(void *ctx)
153 {
154  return "delogo";
155 }
156 
157 static const AVClass delogo_class = {
158  .class_name = "DelogoContext",
159  .item_name = delogo_get_name,
160  .option = delogo_options,
161 };
162 
164 {
165  enum AVPixelFormat pix_fmts[] = {
170  };
171 
173  return 0;
174 }
175 
176 static av_cold int init(AVFilterContext *ctx)
177 {
178  DelogoContext *s = ctx->priv;
179 
180 #define CHECK_UNSET_OPT(opt) \
181  if (s->opt == -1) { \
182  av_log(s, AV_LOG_ERROR, "Option %s was not set.\n", #opt); \
183  return AVERROR(EINVAL); \
184  }
185  CHECK_UNSET_OPT(x);
186  CHECK_UNSET_OPT(y);
187  CHECK_UNSET_OPT(w);
188  CHECK_UNSET_OPT(h);
189 
190  if (s->show)
191  s->band = 4;
192 
193  av_log(ctx, AV_LOG_DEBUG, "x:%d y:%d, w:%d h:%d band:%d show:%d\n",
194  s->x, s->y, s->w, s->h, s->band, s->show);
195 
196  s->w += s->band*2;
197  s->h += s->band*2;
198  s->x -= s->band;
199  s->y -= s->band;
200 
201  return 0;
202 }
203 
204 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
205 {
206  DelogoContext *s = inlink->dst->priv;
207  AVFilterLink *outlink = inlink->dst->outputs[0];
208  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
209  AVFrame *out;
210  int hsub0 = desc->log2_chroma_w;
211  int vsub0 = desc->log2_chroma_h;
212  int direct = 0;
213  int plane;
214 
215  if (av_frame_is_writable(in)) {
216  direct = 1;
217  out = in;
218  } else {
219  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
220  if (!out) {
221  av_frame_free(&in);
222  return AVERROR(ENOMEM);
223  }
224 
225  av_frame_copy_props(out, in);
226  out->width = outlink->w;
227  out->height = outlink->h;
228  }
229 
230  for (plane = 0; plane < 4 && in->data[plane]; plane++) {
231  int hsub = plane == 1 || plane == 2 ? hsub0 : 0;
232  int vsub = plane == 1 || plane == 2 ? vsub0 : 0;
233 
234  apply_delogo(out->data[plane], out->linesize[plane],
235  in ->data[plane], in ->linesize[plane],
236  inlink->w>>hsub, inlink->h>>vsub,
237  s->x>>hsub, s->y>>vsub,
238  s->w>>hsub, s->h>>vsub,
239  s->band>>FFMIN(hsub, vsub),
240  s->show, direct);
241  }
242 
243  if (!direct)
244  av_frame_free(&in);
245 
246  return ff_filter_frame(outlink, out);
247 }
248 
250  {
251  .name = "default",
252  .type = AVMEDIA_TYPE_VIDEO,
253  .get_video_buffer = ff_null_get_video_buffer,
254  .filter_frame = filter_frame,
255  },
256  { NULL }
257 };
258 
260  {
261  .name = "default",
262  .type = AVMEDIA_TYPE_VIDEO,
263  },
264  { NULL }
265 };
266 
268  .name = "delogo",
269  .description = NULL_IF_CONFIG_SMALL("Remove logo from input video."),
270  .priv_size = sizeof(DelogoContext),
271  .priv_class = &delogo_class,
272  .init = init,
274 
275  .inputs = avfilter_vf_delogo_inputs,
276  .outputs = avfilter_vf_delogo_outputs,
277 };