1 /*
2 * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
3 * Copyright (c) 2013 Andrey Utkin <andrey.krieger.utkin gmail com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg 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 GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Box and grid drawing filters. Also a nice template for a filter
25 * that needs to write in the input frame.
26 */
27
28 #include "libavutil/colorspace.h"
29 #include "libavutil/common.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/eval.h"
32 #include "libavutil/pixdesc.h"
33 #include "libavutil/parseutils.h"
34 #include "avfilter.h"
35 #include "formats.h"
36 #include "internal.h"
37 #include "video.h"
38
39 static const char *const var_names[] = {
40 "dar",
41 "hsub", "vsub",
42 "in_h", "ih", ///< height of the input video
43 "in_w", "iw", ///< width of the input video
44 "sar",
45 "x",
46 "y",
47 "h", ///< height of the rendered box
48 "w", ///< width of the rendered box
49 "t",
50 "fill",
51 NULL
52 };
53
54 enum { Y, U, V, A };
55
56 enum var_name {
57 VAR_DAR,
58 VAR_HSUB, VAR_VSUB,
59 VAR_IN_H, VAR_IH,
60 VAR_IN_W, VAR_IW,
61 VAR_SAR,
62 VAR_X,
63 VAR_Y,
64 VAR_H,
65 VAR_W,
66 VAR_T,
67 VAR_MAX,
68 VARS_NB
69 };
70
71 typedef struct DrawBoxContext {
72 const AVClass *class;
73 int x, y, w, h;
74 int thickness;
75 char *color_str;
76 unsigned char yuv_color[4];
77 int invert_color; ///< invert luma color
78 int vsub, hsub; ///< chroma subsampling
79 char *x_expr, *y_expr; ///< expression for x and y
80 char *w_expr, *h_expr; ///< expression for width and height
81 char *t_expr; ///< expression for thickness
82 int have_alpha;
83 int replace;
84 } DrawBoxContext;
85
86 static const int NUM_EXPR_EVALS = 5;
87
init(AVFilterContext * ctx)88 static av_cold int init(AVFilterContext *ctx)
89 {
90 DrawBoxContext *s = ctx->priv;
91 uint8_t rgba_color[4];
92
93 if (!strcmp(s->color_str, "invert"))
94 s->invert_color = 1;
95 else if (av_parse_color(rgba_color, s->color_str, -1, ctx) < 0)
96 return AVERROR(EINVAL);
97
98 if (!s->invert_color) {
99 s->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
100 s->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
101 s->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
102 s->yuv_color[A] = rgba_color[3];
103 }
104
105 return 0;
106 }
107
query_formats(AVFilterContext * ctx)108 static int query_formats(AVFilterContext *ctx)
109 {
110 static const enum AVPixelFormat pix_fmts[] = {
111 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
112 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
113 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
114 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
115 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
116 AV_PIX_FMT_NONE
117 };
118 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
119 if (!fmts_list)
120 return AVERROR(ENOMEM);
121 return ff_set_common_formats(ctx, fmts_list);
122 }
123
config_input(AVFilterLink * inlink)124 static int config_input(AVFilterLink *inlink)
125 {
126 AVFilterContext *ctx = inlink->dst;
127 DrawBoxContext *s = ctx->priv;
128 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
129 double var_values[VARS_NB], res;
130 char *expr;
131 int ret;
132 int i;
133
134 s->hsub = desc->log2_chroma_w;
135 s->vsub = desc->log2_chroma_h;
136 s->have_alpha = desc->flags & AV_PIX_FMT_FLAG_ALPHA;
137
138 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
139 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
140 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
141 var_values[VAR_DAR] = (double)inlink->w / inlink->h * var_values[VAR_SAR];
142 var_values[VAR_HSUB] = s->hsub;
143 var_values[VAR_VSUB] = s->vsub;
144 var_values[VAR_X] = NAN;
145 var_values[VAR_Y] = NAN;
146 var_values[VAR_H] = NAN;
147 var_values[VAR_W] = NAN;
148 var_values[VAR_T] = NAN;
149
150 for (i = 0; i <= NUM_EXPR_EVALS; i++) {
151 /* evaluate expressions, fail on last iteration */
152 var_values[VAR_MAX] = inlink->w;
153 if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
154 var_names, var_values,
155 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
156 goto fail;
157 s->x = var_values[VAR_X] = res;
158
159 var_values[VAR_MAX] = inlink->h;
160 if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
161 var_names, var_values,
162 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
163 goto fail;
164 s->y = var_values[VAR_Y] = res;
165
166 var_values[VAR_MAX] = inlink->w - s->x;
167 if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
168 var_names, var_values,
169 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
170 goto fail;
171 s->w = var_values[VAR_W] = res;
172
173 var_values[VAR_MAX] = inlink->h - s->y;
174 if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
175 var_names, var_values,
176 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
177 goto fail;
178 s->h = var_values[VAR_H] = res;
179
180 var_values[VAR_MAX] = INT_MAX;
181 if ((ret = av_expr_parse_and_eval(&res, (expr = s->t_expr),
182 var_names, var_values,
183 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
184 goto fail;
185 s->thickness = var_values[VAR_T] = res;
186 }
187
188 /* if w or h are zero, use the input w/h */
189 s->w = (s->w > 0) ? s->w : inlink->w;
190 s->h = (s->h > 0) ? s->h : inlink->h;
191
192 /* sanity check width and height */
193 if (s->w < 0 || s->h < 0) {
194 av_log(ctx, AV_LOG_ERROR, "Size values less than 0 are not acceptable.\n");
195 return AVERROR(EINVAL);
196 }
197
198 av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
199 s->x, s->y, s->w, s->h,
200 s->yuv_color[Y], s->yuv_color[U], s->yuv_color[V], s->yuv_color[A]);
201
202 return 0;
203
204 fail:
205 av_log(ctx, AV_LOG_ERROR,
206 "Error when evaluating the expression '%s'.\n",
207 expr);
208 return ret;
209 }
210
pixel_belongs_to_box(DrawBoxContext * s,int x,int y)211 static av_pure av_always_inline int pixel_belongs_to_box(DrawBoxContext *s, int x, int y)
212 {
213 return (y - s->y < s->thickness) || (s->y + s->h - 1 - y < s->thickness) ||
214 (x - s->x < s->thickness) || (s->x + s->w - 1 - x < s->thickness);
215 }
216
filter_frame(AVFilterLink * inlink,AVFrame * frame)217 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
218 {
219 DrawBoxContext *s = inlink->dst->priv;
220 int plane, x, y, xb = s->x, yb = s->y;
221 unsigned char *row[4];
222
223 if (s->have_alpha && s->replace) {
224 for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) {
225 row[0] = frame->data[0] + y * frame->linesize[0];
226 row[3] = frame->data[3] + y * frame->linesize[3];
227
228 for (plane = 1; plane < 3; plane++)
229 row[plane] = frame->data[plane] +
230 frame->linesize[plane] * (y >> s->vsub);
231
232 if (s->invert_color) {
233 for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++)
234 if (pixel_belongs_to_box(s, x, y))
235 row[0][x] = 0xff - row[0][x];
236 } else {
237 for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) {
238 if (pixel_belongs_to_box(s, x, y)) {
239 row[0][x ] = s->yuv_color[Y];
240 row[1][x >> s->hsub] = s->yuv_color[U];
241 row[2][x >> s->hsub] = s->yuv_color[V];
242 row[3][x ] = s->yuv_color[A];
243 }
244 }
245 }
246 }
247 } else {
248 for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) {
249 row[0] = frame->data[0] + y * frame->linesize[0];
250
251 for (plane = 1; plane < 3; plane++)
252 row[plane] = frame->data[plane] +
253 frame->linesize[plane] * (y >> s->vsub);
254
255 if (s->invert_color) {
256 for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++)
257 if (pixel_belongs_to_box(s, x, y))
258 row[0][x] = 0xff - row[0][x];
259 } else {
260 for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) {
261 double alpha = (double)s->yuv_color[A] / 255;
262
263 if (pixel_belongs_to_box(s, x, y)) {
264 row[0][x ] = (1 - alpha) * row[0][x ] + alpha * s->yuv_color[Y];
265 row[1][x >> s->hsub] = (1 - alpha) * row[1][x >> s->hsub] + alpha * s->yuv_color[U];
266 row[2][x >> s->hsub] = (1 - alpha) * row[2][x >> s->hsub] + alpha * s->yuv_color[V];
267 }
268 }
269 }
270 }
271 }
272
273 return ff_filter_frame(inlink->dst->outputs[0], frame);
274 }
275
process_command(AVFilterContext * ctx,const char * cmd,const char * args,char * res,int res_len,int flags)276 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
277 {
278 AVFilterLink *inlink = ctx->inputs[0];
279 DrawBoxContext *s = ctx->priv;
280 int old_x = s->x;
281 int old_y = s->y;
282 int old_w = s->w;
283 int old_h = s->h;
284 int old_t = s->thickness;
285 int old_r = s->replace;
286 int ret;
287
288 ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
289 if (ret < 0)
290 return ret;
291
292 ret = init(ctx);
293 if (ret < 0)
294 goto end;
295 ret = config_input(inlink);
296 end:
297 if (ret < 0) {
298 s->x = old_x;
299 s->y = old_y;
300 s->w = old_w;
301 s->h = old_h;
302 s->thickness = old_t;
303 s->replace = old_r;
304 }
305
306 return ret;
307 }
308
309 #define OFFSET(x) offsetof(DrawBoxContext, x)
310 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
311
312 #if CONFIG_DRAWBOX_FILTER
313
314 static const AVOption drawbox_options[] = {
315 { "x", "set horizontal position of the left box edge", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
316 { "y", "set vertical position of the top box edge", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
317 { "width", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
318 { "w", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
319 { "height", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
320 { "h", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
321 { "color", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
322 { "c", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
323 { "thickness", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, 0, 0, FLAGS },
324 { "t", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, 0, 0, FLAGS },
325 { "replace", "replace color & alpha", OFFSET(replace), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, FLAGS },
326 { NULL }
327 };
328
329 AVFILTER_DEFINE_CLASS(drawbox);
330
331 static const AVFilterPad drawbox_inputs[] = {
332 {
333 .name = "default",
334 .type = AVMEDIA_TYPE_VIDEO,
335 .config_props = config_input,
336 .filter_frame = filter_frame,
337 .needs_writable = 1,
338 },
339 { NULL }
340 };
341
342 static const AVFilterPad drawbox_outputs[] = {
343 {
344 .name = "default",
345 .type = AVMEDIA_TYPE_VIDEO,
346 },
347 { NULL }
348 };
349
350 AVFilter ff_vf_drawbox = {
351 .name = "drawbox",
352 .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
353 .priv_size = sizeof(DrawBoxContext),
354 .priv_class = &drawbox_class,
355 .init = init,
356 .query_formats = query_formats,
357 .inputs = drawbox_inputs,
358 .outputs = drawbox_outputs,
359 .process_command = process_command,
360 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
361 };
362 #endif /* CONFIG_DRAWBOX_FILTER */
363
364 #if CONFIG_DRAWGRID_FILTER
pixel_belongs_to_grid(DrawBoxContext * drawgrid,int x,int y)365 static av_pure av_always_inline int pixel_belongs_to_grid(DrawBoxContext *drawgrid, int x, int y)
366 {
367 // x is horizontal (width) coord,
368 // y is vertical (height) coord
369 int x_modulo;
370 int y_modulo;
371
372 // Abstract from the offset
373 x -= drawgrid->x;
374 y -= drawgrid->y;
375
376 x_modulo = x % drawgrid->w;
377 y_modulo = y % drawgrid->h;
378
379 // If x or y got negative, fix values to preserve logics
380 if (x_modulo < 0)
381 x_modulo += drawgrid->w;
382 if (y_modulo < 0)
383 y_modulo += drawgrid->h;
384
385 return x_modulo < drawgrid->thickness // Belongs to vertical line
386 || y_modulo < drawgrid->thickness; // Belongs to horizontal line
387 }
388
drawgrid_filter_frame(AVFilterLink * inlink,AVFrame * frame)389 static int drawgrid_filter_frame(AVFilterLink *inlink, AVFrame *frame)
390 {
391 DrawBoxContext *drawgrid = inlink->dst->priv;
392 int plane, x, y;
393 uint8_t *row[4];
394
395 if (drawgrid->have_alpha && drawgrid->replace) {
396 for (y = 0; y < frame->height; y++) {
397 row[0] = frame->data[0] + y * frame->linesize[0];
398 row[3] = frame->data[3] + y * frame->linesize[3];
399
400 for (plane = 1; plane < 3; plane++)
401 row[plane] = frame->data[plane] +
402 frame->linesize[plane] * (y >> drawgrid->vsub);
403
404 if (drawgrid->invert_color) {
405 for (x = 0; x < frame->width; x++)
406 if (pixel_belongs_to_grid(drawgrid, x, y))
407 row[0][x] = 0xff - row[0][x];
408 } else {
409 for (x = 0; x < frame->width; x++) {
410 if (pixel_belongs_to_grid(drawgrid, x, y)) {
411 row[0][x ] = drawgrid->yuv_color[Y];
412 row[1][x >> drawgrid->hsub] = drawgrid->yuv_color[U];
413 row[2][x >> drawgrid->hsub] = drawgrid->yuv_color[V];
414 row[3][x ] = drawgrid->yuv_color[A];
415 }
416 }
417 }
418 }
419 } else {
420 for (y = 0; y < frame->height; y++) {
421 row[0] = frame->data[0] + y * frame->linesize[0];
422
423 for (plane = 1; plane < 3; plane++)
424 row[plane] = frame->data[plane] +
425 frame->linesize[plane] * (y >> drawgrid->vsub);
426
427 if (drawgrid->invert_color) {
428 for (x = 0; x < frame->width; x++)
429 if (pixel_belongs_to_grid(drawgrid, x, y))
430 row[0][x] = 0xff - row[0][x];
431 } else {
432 for (x = 0; x < frame->width; x++) {
433 double alpha = (double)drawgrid->yuv_color[A] / 255;
434
435 if (pixel_belongs_to_grid(drawgrid, x, y)) {
436 row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawgrid->yuv_color[Y];
437 row[1][x >> drawgrid->hsub] = (1 - alpha) * row[1][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[U];
438 row[2][x >> drawgrid->hsub] = (1 - alpha) * row[2][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[V];
439 }
440 }
441 }
442 }
443 }
444
445 return ff_filter_frame(inlink->dst->outputs[0], frame);
446 }
447
448 static const AVOption drawgrid_options[] = {
449 { "x", "set horizontal offset", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
450 { "y", "set vertical offset", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
451 { "width", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
452 { "w", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
453 { "height", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
454 { "h", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, 0, 0, FLAGS },
455 { "color", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
456 { "c", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, 0, 0, FLAGS },
457 { "thickness", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, 0, 0, FLAGS },
458 { "t", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, 0, 0, FLAGS },
459 { "replace", "replace color & alpha", OFFSET(replace), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, FLAGS },
460 { NULL }
461 };
462
463 AVFILTER_DEFINE_CLASS(drawgrid);
464
465 static const AVFilterPad drawgrid_inputs[] = {
466 {
467 .name = "default",
468 .type = AVMEDIA_TYPE_VIDEO,
469 .config_props = config_input,
470 .filter_frame = drawgrid_filter_frame,
471 .needs_writable = 1,
472 },
473 { NULL }
474 };
475
476 static const AVFilterPad drawgrid_outputs[] = {
477 {
478 .name = "default",
479 .type = AVMEDIA_TYPE_VIDEO,
480 },
481 { NULL }
482 };
483
484 AVFilter ff_vf_drawgrid = {
485 .name = "drawgrid",
486 .description = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."),
487 .priv_size = sizeof(DrawBoxContext),
488 .priv_class = &drawgrid_class,
489 .init = init,
490 .query_formats = query_formats,
491 .inputs = drawgrid_inputs,
492 .outputs = drawgrid_outputs,
493 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
494 .process_command = process_command,
495 };
496
497 #endif /* CONFIG_DRAWGRID_FILTER */
498