GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_chromakey.c Lines: 0 150 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 80 0.0 %

Line Branch Exec Source
1
/*
2
 * Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21
#include "libavutil/opt.h"
22
#include "libavutil/imgutils.h"
23
#include "libavutil/intreadwrite.h"
24
#include "avfilter.h"
25
#include "formats.h"
26
#include "internal.h"
27
#include "video.h"
28
29
typedef struct ChromakeyContext {
30
    const AVClass *class;
31
32
    uint8_t chromakey_rgba[4];
33
    uint16_t chromakey_uv[2];
34
35
    float similarity;
36
    float blend;
37
38
    int is_yuv;
39
    int depth;
40
    int mid;
41
    int max;
42
43
    int hsub_log2;
44
    int vsub_log2;
45
46
    int (*do_slice)(AVFilterContext *ctx, void *arg,
47
                    int jobnr, int nb_jobs);
48
} ChromakeyContext;
49
50
static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
51
{
52
    double diff = 0.0;
53
    int du, dv, i;
54
55
    for (i = 0; i < 9; ++i) {
56
        du = (int)u[i] - ctx->chromakey_uv[0];
57
        dv = (int)v[i] - ctx->chromakey_uv[1];
58
59
        diff += sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2));
60
    }
61
62
    diff /= 9.0;
63
64
    if (ctx->blend > 0.0001) {
65
        return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
66
    } else {
67
        return (diff > ctx->similarity) ? 255 : 0;
68
    }
69
}
70
71
static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
72
{
73
    double max = ctx->max;
74
    double diff = 0.0;
75
    int du, dv, i;
76
77
    for (i = 0; i < 9; ++i) {
78
        du = (int)u[i] - ctx->chromakey_uv[0];
79
        dv = (int)v[i] - ctx->chromakey_uv[1];
80
81
        diff += sqrt((du * du + dv * dv) / (max * max * 2));
82
    }
83
84
    diff /= 9.0;
85
86
    if (ctx->blend > 0.0001) {
87
        return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * max;
88
    } else {
89
        return (diff > ctx->similarity) ? max : 0;
90
    }
91
}
92
93
static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
94
{
95
    if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
96
        return;
97
98
    x >>= hsub_log2;
99
    y >>= vsub_log2;
100
101
    *u = frame->data[1][frame->linesize[1] * y + x];
102
    *v = frame->data[2][frame->linesize[2] * y + x];
103
}
104
105
static av_always_inline void get_pixel16_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
106
{
107
    if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
108
        return;
109
110
    x >>= hsub_log2;
111
    y >>= vsub_log2;
112
113
    *u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
114
    *v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
115
}
116
117
static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
118
{
119
    AVFrame *frame = arg;
120
121
    const int slice_start = (frame->height * jobnr) / nb_jobs;
122
    const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
123
124
    ChromakeyContext *ctx = avctx->priv;
125
126
    int x, y, xo, yo;
127
    uint8_t u[9], v[9];
128
129
    memset(u, ctx->chromakey_uv[0], sizeof(u));
130
    memset(v, ctx->chromakey_uv[1], sizeof(v));
131
132
    for (y = slice_start; y < slice_end; ++y) {
133
        for (x = 0; x < frame->width; ++x) {
134
            for (yo = 0; yo < 3; ++yo) {
135
                for (xo = 0; xo < 3; ++xo) {
136
                    get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
137
                }
138
            }
139
140
            frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
141
        }
142
    }
143
144
    return 0;
145
}
146
147
static int do_chromakey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
148
{
149
    AVFrame *frame = arg;
150
151
    const int slice_start = (frame->height * jobnr) / nb_jobs;
152
    const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
153
154
    ChromakeyContext *ctx = avctx->priv;
155
156
    int x, y, xo, yo;
157
    uint16_t u[9], v[9];
158
159
    for (int i = 0; i < 9; i++) {
160
        u[i] = ctx->chromakey_uv[0];
161
        v[i] = ctx->chromakey_uv[1];
162
    }
163
164
    for (y = slice_start; y < slice_end; ++y) {
165
        for (x = 0; x < frame->width; ++x) {
166
            uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
167
168
            for (yo = 0; yo < 3; ++yo) {
169
                for (xo = 0; xo < 3; ++xo) {
170
                    get_pixel16_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
171
                }
172
            }
173
174
            dst[x] = do_chromakey_pixel16(ctx, u, v);
175
        }
176
    }
177
178
    return 0;
179
}
180
181
static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
182
{
183
    ChromakeyContext *ctx = avctx->priv;
184
    AVFrame *frame = arg;
185
    const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
186
    const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
187
188
    int x, y, alpha;
189
190
    for (y = slice_start; y < slice_end; ++y) {
191
        for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
192
            int u = frame->data[1][frame->linesize[1] * y + x];
193
            int v = frame->data[2][frame->linesize[2] * y + x];
194
            double diff;
195
            int du, dv;
196
197
            du = u - ctx->chromakey_uv[0];
198
            dv = v - ctx->chromakey_uv[1];
199
200
            diff = sqrt((du * du + dv * dv) / (255.0 * 255.0));
201
202
            alpha = diff > ctx->similarity;
203
            if (ctx->blend > 0.0001) {
204
                double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
205
206
                frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
207
                frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
208
            } else if (alpha) {
209
                frame->data[1][frame->linesize[1] * y + x] = 128;
210
                frame->data[2][frame->linesize[2] * y + x] = 128;
211
            }
212
        }
213
    }
214
215
    return 0;
216
}
217
218
static int do_chromahold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
219
{
220
    ChromakeyContext *ctx = avctx->priv;
221
    AVFrame *frame = arg;
222
    const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
223
    const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
224
    const int mid = ctx->mid;
225
    double max = ctx->max;
226
227
    int x, y, alpha;
228
229
    for (y = slice_start; y < slice_end; ++y) {
230
        for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
231
            int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
232
            int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
233
            double diff;
234
            int du, dv;
235
236
            du = u - ctx->chromakey_uv[0];
237
            dv = v - ctx->chromakey_uv[1];
238
239
            diff = sqrt((du * du + dv * dv) / (max * max));
240
241
            alpha = diff > ctx->similarity;
242
            if (ctx->blend > 0.0001) {
243
                double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
244
245
                AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid + (u - mid) * f);
246
                AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid + (v - mid) * f);
247
            } else if (alpha) {
248
                AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid);
249
                AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid);
250
            }
251
        }
252
    }
253
254
    return 0;
255
}
256
257
static int filter_frame(AVFilterLink *link, AVFrame *frame)
258
{
259
    AVFilterContext *avctx = link->dst;
260
    ChromakeyContext *ctx = avctx->priv;
261
    int res;
262
263
    if (res = avctx->internal->execute(avctx, ctx->do_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
264
        return res;
265
266
    return ff_filter_frame(avctx->outputs[0], frame);
267
}
268
269
#define FIXNUM(x) lrint((x) * (1 << 10))
270
#define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
271
#define RGB_TO_V(rgb) (((  FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
272
273
static av_cold int config_output(AVFilterLink *outlink)
274
{
275
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
276
    AVFilterContext *avctx = outlink->src;
277
    ChromakeyContext *ctx = avctx->priv;
278
    int factor;
279
280
    ctx->depth = desc->comp[0].depth;
281
    ctx->mid = 1 << (ctx->depth - 1);
282
    ctx->max = (1 << ctx->depth) - 1;
283
284
    factor = 1 << (ctx->depth - 8);
285
286
    if (ctx->is_yuv) {
287
        ctx->chromakey_uv[0] = ctx->chromakey_rgba[1] * factor;
288
        ctx->chromakey_uv[1] = ctx->chromakey_rgba[2] * factor;
289
    } else {
290
        ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba) * factor;
291
        ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba) * factor;
292
    }
293
294
    if (!strcmp(avctx->filter->name, "chromakey")) {
295
        ctx->do_slice = ctx->depth <= 8 ? do_chromakey_slice : do_chromakey16_slice;
296
    } else {
297
        ctx->do_slice = ctx->depth <= 8 ? do_chromahold_slice: do_chromahold16_slice;
298
    }
299
300
    return 0;
301
}
302
303
static av_cold int query_formats(AVFilterContext *avctx)
304
{
305
    static const enum AVPixelFormat pixel_fmts[] = {
306
        AV_PIX_FMT_YUVA420P,
307
        AV_PIX_FMT_YUVA422P,
308
        AV_PIX_FMT_YUVA444P,
309
        AV_PIX_FMT_YUVA420P9,  AV_PIX_FMT_YUVA422P9,  AV_PIX_FMT_YUVA444P9,
310
        AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
311
        AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
312
        AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
313
        AV_PIX_FMT_NONE
314
    };
315
316
    static const enum AVPixelFormat hold_pixel_fmts[] = {
317
        AV_PIX_FMT_YUV420P,
318
        AV_PIX_FMT_YUV422P,
319
        AV_PIX_FMT_YUV444P,
320
        AV_PIX_FMT_YUVA420P,
321
        AV_PIX_FMT_YUVA422P,
322
        AV_PIX_FMT_YUVA444P,
323
        AV_PIX_FMT_YUV420P9,   AV_PIX_FMT_YUV422P9,   AV_PIX_FMT_YUV444P9,
324
        AV_PIX_FMT_YUV420P10,  AV_PIX_FMT_YUV422P10,  AV_PIX_FMT_YUV444P10,
325
        AV_PIX_FMT_YUV444P12,  AV_PIX_FMT_YUV422P12,  AV_PIX_FMT_YUV420P12,
326
        AV_PIX_FMT_YUV444P14,  AV_PIX_FMT_YUV422P14,  AV_PIX_FMT_YUV420P14,
327
        AV_PIX_FMT_YUV420P16,  AV_PIX_FMT_YUV422P16,  AV_PIX_FMT_YUV444P16,
328
        AV_PIX_FMT_YUVA420P9,  AV_PIX_FMT_YUVA422P9,  AV_PIX_FMT_YUVA444P9,
329
        AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
330
        AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
331
        AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
332
        AV_PIX_FMT_NONE
333
    };
334
335
    AVFilterFormats *formats = NULL;
336
337
    formats = ff_make_format_list(!strcmp(avctx->filter->name, "chromahold") ? hold_pixel_fmts : pixel_fmts);
338
    if (!formats)
339
        return AVERROR(ENOMEM);
340
341
    return ff_set_common_formats(avctx, formats);
342
}
343
344
static av_cold int config_input(AVFilterLink *inlink)
345
{
346
    AVFilterContext *avctx = inlink->dst;
347
    ChromakeyContext *ctx = avctx->priv;
348
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
349
350
    ctx->hsub_log2 = desc->log2_chroma_w;
351
    ctx->vsub_log2 = desc->log2_chroma_h;
352
353
    return 0;
354
}
355
356
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
357
                           char *res, int res_len, int flags)
358
{
359
    int ret;
360
361
    ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
362
    if (ret < 0)
363
        return ret;
364
365
    return config_output(ctx->outputs[0]);
366
}
367
368
static const AVFilterPad chromakey_inputs[] = {
369
    {
370
        .name           = "default",
371
        .type           = AVMEDIA_TYPE_VIDEO,
372
        .needs_writable = 1,
373
        .filter_frame   = filter_frame,
374
        .config_props   = config_input,
375
    },
376
    { NULL }
377
};
378
379
static const AVFilterPad chromakey_outputs[] = {
380
    {
381
        .name           = "default",
382
        .type           = AVMEDIA_TYPE_VIDEO,
383
        .config_props   = config_output,
384
    },
385
    { NULL }
386
};
387
388
#define OFFSET(x) offsetof(ChromakeyContext, x)
389
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
390
391
static const AVOption chromakey_options[] = {
392
    { "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
393
    { "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
394
    { "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
395
    { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
396
    { NULL }
397
};
398
399
AVFILTER_DEFINE_CLASS(chromakey);
400
401
AVFilter ff_vf_chromakey = {
402
    .name          = "chromakey",
403
    .description   = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
404
    .priv_size     = sizeof(ChromakeyContext),
405
    .priv_class    = &chromakey_class,
406
    .query_formats = query_formats,
407
    .inputs        = chromakey_inputs,
408
    .outputs       = chromakey_outputs,
409
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
410
    .process_command = process_command,
411
};
412
413
static const AVOption chromahold_options[] = {
414
    { "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
415
    { "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
416
    { "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
417
    { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
418
    { NULL }
419
};
420
421
static const AVFilterPad chromahold_inputs[] = {
422
    {
423
        .name           = "default",
424
        .type           = AVMEDIA_TYPE_VIDEO,
425
        .needs_writable = 1,
426
        .filter_frame   = filter_frame,
427
        .config_props   = config_input,
428
    },
429
    { NULL }
430
};
431
432
static const AVFilterPad chromahold_outputs[] = {
433
    {
434
        .name           = "default",
435
        .type           = AVMEDIA_TYPE_VIDEO,
436
        .config_props   = config_output,
437
    },
438
    { NULL }
439
};
440
441
AVFILTER_DEFINE_CLASS(chromahold);
442
443
AVFilter ff_vf_chromahold = {
444
    .name          = "chromahold",
445
    .description   = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
446
    .priv_size     = sizeof(ChromakeyContext),
447
    .priv_class    = &chromahold_class,
448
    .query_formats = query_formats,
449
    .inputs        = chromahold_inputs,
450
    .outputs       = chromahold_outputs,
451
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
452
    .process_command = process_command,
453
};