aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_delogo.c
blob: a9ba442699af9df045e72dc206369427a74d071f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/*
 * 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"
#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;

    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 AVClass delogo_class = {
    .class_name = "DelogoContext",
    .item_name  = av_default_item_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 = ff_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}},
};