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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 | NULL | |
51 | }; | |
52 | ||
53 | enum { Y, U, V, A }; | |
54 | ||
55 | enum var_name { | |
56 | VAR_DAR, | |
57 | VAR_HSUB, VAR_VSUB, | |
58 | VAR_IN_H, VAR_IH, | |
59 | VAR_IN_W, VAR_IW, | |
60 | VAR_SAR, | |
61 | VAR_X, | |
62 | VAR_Y, | |
63 | VAR_H, | |
64 | VAR_W, | |
65 | VAR_T, | |
66 | VARS_NB | |
67 | }; | |
68 | ||
69 | typedef struct DrawBoxContext { | |
70 | const AVClass *class; | |
71 | int x, y, w, h; | |
72 | int thickness; | |
73 | char *color_str; | |
74 | unsigned char yuv_color[4]; | |
75 | int invert_color; ///< invert luma color | |
76 | int vsub, hsub; ///< chroma subsampling | |
77 | char *x_expr, *y_expr; ///< expression for x and y | |
78 | char *w_expr, *h_expr; ///< expression for width and height | |
79 | char *t_expr; ///< expression for thickness | |
80 | } DrawBoxContext; | |
81 | ||
82 | static const int NUM_EXPR_EVALS = 5; | |
83 | ||
84 | static av_cold int init(AVFilterContext *ctx) | |
85 | { | |
86 | DrawBoxContext *s = ctx->priv; | |
87 | uint8_t rgba_color[4]; | |
88 | ||
89 | if (!strcmp(s->color_str, "invert")) | |
90 | s->invert_color = 1; | |
91 | else if (av_parse_color(rgba_color, s->color_str, -1, ctx) < 0) | |
92 | return AVERROR(EINVAL); | |
93 | ||
94 | if (!s->invert_color) { | |
95 | s->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]); | |
96 | s->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0); | |
97 | s->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0); | |
98 | s->yuv_color[A] = rgba_color[3]; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int query_formats(AVFilterContext *ctx) | |
105 | { | |
106 | static const enum AVPixelFormat pix_fmts[] = { | |
107 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, | |
108 | AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, | |
109 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, | |
110 | AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P, | |
111 | AV_PIX_FMT_NONE | |
112 | }; | |
113 | ||
114 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static int config_input(AVFilterLink *inlink) | |
119 | { | |
120 | AVFilterContext *ctx = inlink->dst; | |
121 | DrawBoxContext *s = ctx->priv; | |
122 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
123 | double var_values[VARS_NB], res; | |
124 | char *expr; | |
125 | int ret; | |
126 | int i; | |
127 | ||
128 | s->hsub = desc->log2_chroma_w; | |
129 | s->vsub = desc->log2_chroma_h; | |
130 | ||
131 | var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h; | |
132 | var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w; | |
133 | var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1; | |
134 | var_values[VAR_DAR] = (double)inlink->w / inlink->h * var_values[VAR_SAR]; | |
135 | var_values[VAR_HSUB] = s->hsub; | |
136 | var_values[VAR_VSUB] = s->vsub; | |
137 | var_values[VAR_X] = NAN; | |
138 | var_values[VAR_Y] = NAN; | |
139 | var_values[VAR_H] = NAN; | |
140 | var_values[VAR_W] = NAN; | |
141 | var_values[VAR_T] = NAN; | |
142 | ||
143 | for (i = 0; i <= NUM_EXPR_EVALS; i++) { | |
144 | /* evaluate expressions, fail on last iteration */ | |
145 | if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr), | |
146 | var_names, var_values, | |
147 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS) | |
148 | goto fail; | |
149 | s->x = var_values[VAR_X] = res; | |
150 | ||
151 | if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr), | |
152 | var_names, var_values, | |
153 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS) | |
154 | goto fail; | |
155 | s->y = var_values[VAR_Y] = res; | |
156 | ||
157 | if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr), | |
158 | var_names, var_values, | |
159 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS) | |
160 | goto fail; | |
161 | s->w = var_values[VAR_W] = res; | |
162 | ||
163 | if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr), | |
164 | var_names, var_values, | |
165 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS) | |
166 | goto fail; | |
167 | s->h = var_values[VAR_H] = res; | |
168 | ||
169 | if ((ret = av_expr_parse_and_eval(&res, (expr = s->t_expr), | |
170 | var_names, var_values, | |
171 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS) | |
172 | goto fail; | |
173 | s->thickness = var_values[VAR_T] = res; | |
174 | } | |
175 | ||
176 | /* if w or h are zero, use the input w/h */ | |
177 | s->w = (s->w > 0) ? s->w : inlink->w; | |
178 | s->h = (s->h > 0) ? s->h : inlink->h; | |
179 | ||
180 | /* sanity check width and height */ | |
181 | if (s->w < 0 || s->h < 0) { | |
182 | av_log(ctx, AV_LOG_ERROR, "Size values less than 0 are not acceptable.\n"); | |
183 | return AVERROR(EINVAL); | |
184 | } | |
185 | ||
186 | av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n", | |
187 | s->x, s->y, s->w, s->h, | |
188 | s->yuv_color[Y], s->yuv_color[U], s->yuv_color[V], s->yuv_color[A]); | |
189 | ||
190 | return 0; | |
191 | ||
192 | fail: | |
193 | av_log(ctx, AV_LOG_ERROR, | |
194 | "Error when evaluating the expression '%s'.\n", | |
195 | expr); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
200 | { | |
201 | DrawBoxContext *s = inlink->dst->priv; | |
202 | int plane, x, y, xb = s->x, yb = s->y; | |
203 | unsigned char *row[4]; | |
204 | ||
205 | for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) { | |
206 | row[0] = frame->data[0] + y * frame->linesize[0]; | |
207 | ||
208 | for (plane = 1; plane < 3; plane++) | |
209 | row[plane] = frame->data[plane] + | |
210 | frame->linesize[plane] * (y >> s->vsub); | |
211 | ||
212 | if (s->invert_color) { | |
213 | for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) | |
214 | if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) || | |
215 | (x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness)) | |
216 | row[0][x] = 0xff - row[0][x]; | |
217 | } else { | |
218 | for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) { | |
219 | double alpha = (double)s->yuv_color[A] / 255; | |
220 | ||
221 | if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) || | |
222 | (x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness)) { | |
223 | row[0][x ] = (1 - alpha) * row[0][x ] + alpha * s->yuv_color[Y]; | |
224 | row[1][x >> s->hsub] = (1 - alpha) * row[1][x >> s->hsub] + alpha * s->yuv_color[U]; | |
225 | row[2][x >> s->hsub] = (1 - alpha) * row[2][x >> s->hsub] + alpha * s->yuv_color[V]; | |
226 | } | |
227 | } | |
228 | } | |
229 | } | |
230 | ||
231 | return ff_filter_frame(inlink->dst->outputs[0], frame); | |
232 | } | |
233 | ||
234 | #define OFFSET(x) offsetof(DrawBoxContext, x) | |
235 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | |
236 | ||
237 | #if CONFIG_DRAWBOX_FILTER | |
238 | ||
239 | static const AVOption drawbox_options[] = { | |
240 | { "x", "set horizontal position of the left box edge", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
241 | { "y", "set vertical position of the top box edge", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
242 | { "width", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
243 | { "w", "set width of the box", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
244 | { "height", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
245 | { "h", "set height of the box", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
246 | { "color", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
247 | { "c", "set color of the box", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
248 | { "thickness", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
249 | { "t", "set the box thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, { .str="3" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
250 | { NULL } | |
251 | }; | |
252 | ||
253 | AVFILTER_DEFINE_CLASS(drawbox); | |
254 | ||
255 | static const AVFilterPad drawbox_inputs[] = { | |
256 | { | |
257 | .name = "default", | |
258 | .type = AVMEDIA_TYPE_VIDEO, | |
259 | .config_props = config_input, | |
260 | .filter_frame = filter_frame, | |
261 | .needs_writable = 1, | |
262 | }, | |
263 | { NULL } | |
264 | }; | |
265 | ||
266 | static const AVFilterPad drawbox_outputs[] = { | |
267 | { | |
268 | .name = "default", | |
269 | .type = AVMEDIA_TYPE_VIDEO, | |
270 | }, | |
271 | { NULL } | |
272 | }; | |
273 | ||
274 | AVFilter ff_vf_drawbox = { | |
275 | .name = "drawbox", | |
276 | .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."), | |
277 | .priv_size = sizeof(DrawBoxContext), | |
278 | .priv_class = &drawbox_class, | |
279 | .init = init, | |
280 | .query_formats = query_formats, | |
281 | .inputs = drawbox_inputs, | |
282 | .outputs = drawbox_outputs, | |
283 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | |
284 | }; | |
285 | #endif /* CONFIG_DRAWBOX_FILTER */ | |
286 | ||
287 | #if CONFIG_DRAWGRID_FILTER | |
288 | static av_pure av_always_inline int pixel_belongs_to_grid(DrawBoxContext *drawgrid, int x, int y) | |
289 | { | |
290 | // x is horizontal (width) coord, | |
291 | // y is vertical (height) coord | |
292 | int x_modulo; | |
293 | int y_modulo; | |
294 | ||
295 | // Abstract from the offset | |
296 | x -= drawgrid->x; | |
297 | y -= drawgrid->y; | |
298 | ||
299 | x_modulo = x % drawgrid->w; | |
300 | y_modulo = y % drawgrid->h; | |
301 | ||
302 | // If x or y got negative, fix values to preserve logics | |
303 | if (x_modulo < 0) | |
304 | x_modulo += drawgrid->w; | |
305 | if (y_modulo < 0) | |
306 | y_modulo += drawgrid->h; | |
307 | ||
308 | return x_modulo < drawgrid->thickness // Belongs to vertical line | |
309 | || y_modulo < drawgrid->thickness; // Belongs to horizontal line | |
310 | } | |
311 | ||
312 | static int drawgrid_filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
313 | { | |
314 | DrawBoxContext *drawgrid = inlink->dst->priv; | |
315 | int plane, x, y; | |
316 | uint8_t *row[4]; | |
317 | ||
318 | for (y = 0; y < frame->height; y++) { | |
319 | row[0] = frame->data[0] + y * frame->linesize[0]; | |
320 | ||
321 | for (plane = 1; plane < 3; plane++) | |
322 | row[plane] = frame->data[plane] + | |
323 | frame->linesize[plane] * (y >> drawgrid->vsub); | |
324 | ||
325 | if (drawgrid->invert_color) { | |
326 | for (x = 0; x < frame->width; x++) | |
327 | if (pixel_belongs_to_grid(drawgrid, x, y)) | |
328 | row[0][x] = 0xff - row[0][x]; | |
329 | } else { | |
330 | for (x = 0; x < frame->width; x++) { | |
331 | double alpha = (double)drawgrid->yuv_color[A] / 255; | |
332 | ||
333 | if (pixel_belongs_to_grid(drawgrid, x, y)) { | |
334 | row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawgrid->yuv_color[Y]; | |
335 | row[1][x >> drawgrid->hsub] = (1 - alpha) * row[1][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[U]; | |
336 | row[2][x >> drawgrid->hsub] = (1 - alpha) * row[2][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[V]; | |
337 | } | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
342 | return ff_filter_frame(inlink->dst->outputs[0], frame); | |
343 | } | |
344 | ||
345 | static const AVOption drawgrid_options[] = { | |
346 | { "x", "set horizontal offset", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
347 | { "y", "set vertical offset", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
348 | { "width", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
349 | { "w", "set width of grid cell", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
350 | { "height", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
351 | { "h", "set height of grid cell", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str="0" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
352 | { "color", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
353 | { "c", "set color of the grid", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS }, | |
354 | { "thickness", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS }, | |
355 | { "t", "set grid line thickness", OFFSET(t_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS }, | |
356 | { NULL } | |
357 | }; | |
358 | ||
359 | AVFILTER_DEFINE_CLASS(drawgrid); | |
360 | ||
361 | static const AVFilterPad drawgrid_inputs[] = { | |
362 | { | |
363 | .name = "default", | |
364 | .type = AVMEDIA_TYPE_VIDEO, | |
365 | .config_props = config_input, | |
366 | .filter_frame = drawgrid_filter_frame, | |
367 | .needs_writable = 1, | |
368 | }, | |
369 | { NULL } | |
370 | }; | |
371 | ||
372 | static const AVFilterPad drawgrid_outputs[] = { | |
373 | { | |
374 | .name = "default", | |
375 | .type = AVMEDIA_TYPE_VIDEO, | |
376 | }, | |
377 | { NULL } | |
378 | }; | |
379 | ||
380 | AVFilter ff_vf_drawgrid = { | |
381 | .name = "drawgrid", | |
382 | .description = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."), | |
383 | .priv_size = sizeof(DrawBoxContext), | |
384 | .priv_class = &drawgrid_class, | |
385 | .init = init, | |
386 | .query_formats = query_formats, | |
387 | .inputs = drawgrid_inputs, | |
388 | .outputs = drawgrid_outputs, | |
389 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | |
390 | }; | |
391 | ||
392 | #endif /* CONFIG_DRAWGRID_FILTER */ |