FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vsrc_mandelbrot.c
Date: 2024-04-24 13:31:03
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Branches: 0 127 0.0%
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1 /*
2 * Copyright (c) 2011 Michael Niedermayer
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 * The vsrc_color filter from Stefano Sabatini was used as template to create
21 * this
22 */
23
24 /**
25 * @file
26 * Mandelbrot fractal renderer
27 */
28
29 #include "avfilter.h"
30 #include "video.h"
31 #include "internal.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/mem.h"
34 #include "libavutil/opt.h"
35 #include <float.h>
36 #include <math.h>
37
38 #define SQR(a) ((a)*(a))
39
40 enum Outer{
41 ITERATION_COUNT,
42 NORMALIZED_ITERATION_COUNT,
43 WHITE,
44 OUTZ,
45 };
46
47 enum Inner{
48 BLACK,
49 PERIOD,
50 CONVTIME,
51 MINCOL,
52 };
53
54 typedef struct Point {
55 double p[2];
56 uint32_t val;
57 } Point;
58
59 typedef struct MBContext {
60 const AVClass *class;
61 int w, h;
62 AVRational frame_rate;
63 uint64_t pts;
64 int maxiter;
65 double start_x;
66 double start_y;
67 double start_scale;
68 double end_scale;
69 double end_pts;
70 double bailout;
71 int outer;
72 int inner;
73 int cache_allocated;
74 int cache_used;
75 Point *point_cache;
76 Point *next_cache;
77 double (*zyklus)[2];
78 uint32_t dither;
79
80 double morphxf;
81 double morphyf;
82 double morphamp;
83 } MBContext;
84
85 #define OFFSET(x) offsetof(MBContext, x)
86 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
87
88 static const AVOption mandelbrot_options[] = {
89 {"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
90 {"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
91 {"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
92 {"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
93 {"maxiter", "set max iterations number", OFFSET(maxiter), AV_OPT_TYPE_INT, {.i64=7189}, 1, INT_MAX, FLAGS },
94 {"start_x", "set the initial x position", OFFSET(start_x), AV_OPT_TYPE_DOUBLE, {.dbl=-0.743643887037158704752191506114774}, -100, 100, FLAGS },
95 {"start_y", "set the initial y position", OFFSET(start_y), AV_OPT_TYPE_DOUBLE, {.dbl=-0.131825904205311970493132056385139}, -100, 100, FLAGS },
96 {"start_scale", "set the initial scale value", OFFSET(start_scale), AV_OPT_TYPE_DOUBLE, {.dbl=3.0}, 0, FLT_MAX, FLAGS },
97 {"end_scale", "set the terminal scale value", OFFSET(end_scale), AV_OPT_TYPE_DOUBLE, {.dbl=0.3}, 0, FLT_MAX, FLAGS },
98 {"end_pts", "set the terminal pts value", OFFSET(end_pts), AV_OPT_TYPE_DOUBLE, {.dbl=400}, 0, INT64_MAX, FLAGS },
99 {"bailout", "set the bailout value", OFFSET(bailout), AV_OPT_TYPE_DOUBLE, {.dbl=10}, 0, FLT_MAX, FLAGS },
100 {"morphxf", "set morph x frequency", OFFSET(morphxf), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, -FLT_MAX, FLT_MAX, FLAGS },
101 {"morphyf", "set morph y frequency", OFFSET(morphyf), AV_OPT_TYPE_DOUBLE, {.dbl=0.0123}, -FLT_MAX, FLT_MAX, FLAGS },
102 {"morphamp", "set morph amplitude", OFFSET(morphamp), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
103
104 {"outer", "set outer coloring mode", OFFSET(outer), AV_OPT_TYPE_INT, {.i64=NORMALIZED_ITERATION_COUNT}, 0, INT_MAX, FLAGS, .unit = "outer" },
105 {"iteration_count", "set iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, .unit = "outer" },
106 {"normalized_iteration_count", "set normalized iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=NORMALIZED_ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, .unit = "outer" },
107 {"white", "set white mode", 0, AV_OPT_TYPE_CONST, {.i64=WHITE}, INT_MIN, INT_MAX, FLAGS, .unit = "outer" },
108 {"outz", "set outz mode", 0, AV_OPT_TYPE_CONST, {.i64=OUTZ}, INT_MIN, INT_MAX, FLAGS, .unit = "outer" },
109
110 {"inner", "set inner coloring mode", OFFSET(inner), AV_OPT_TYPE_INT, {.i64=MINCOL}, 0, INT_MAX, FLAGS, .unit = "inner" },
111 {"black", "set black mode", 0, AV_OPT_TYPE_CONST, {.i64=BLACK}, INT_MIN, INT_MAX, FLAGS, .unit = "inner"},
112 {"period", "set period mode", 0, AV_OPT_TYPE_CONST, {.i64=PERIOD}, INT_MIN, INT_MAX, FLAGS, .unit = "inner"},
113 {"convergence", "show time until convergence", 0, AV_OPT_TYPE_CONST, {.i64=CONVTIME}, INT_MIN, INT_MAX, FLAGS, .unit = "inner"},
114 {"mincol", "color based on point closest to the origin of the iterations", 0, AV_OPT_TYPE_CONST, {.i64=MINCOL}, INT_MIN, INT_MAX, FLAGS, .unit = "inner"},
115
116 {NULL},
117 };
118
119 AVFILTER_DEFINE_CLASS(mandelbrot);
120
121 ✗ static av_cold int init(AVFilterContext *ctx)
122 {
123 ✗ MBContext *s = ctx->priv;
124
125 ✗ s->bailout *= s->bailout;
126
127 ✗ s->start_scale /=s->h;
128 ✗ s->end_scale /=s->h;
129
130 ✗ s->cache_allocated = s->w * s->h * 3;
131 ✗ s->cache_used = 0;
132 ✗ s->point_cache= av_malloc_array(s->cache_allocated, sizeof(*s->point_cache));
133 ✗ s-> next_cache= av_malloc_array(s->cache_allocated, sizeof(*s-> next_cache));
134 ✗ s-> zyklus = av_malloc_array(s->maxiter + 16, sizeof(*s->zyklus));
135
136 ✗ if (!s->point_cache || !s->next_cache || !s->zyklus)
137 ✗ return AVERROR(ENOMEM);
138
139 ✗ return 0;
140 }
141
142 ✗ static av_cold void uninit(AVFilterContext *ctx)
143 {
144 ✗ MBContext *s = ctx->priv;
145
146 ✗ av_freep(&s->point_cache);
147 ✗ av_freep(&s-> next_cache);
148 ✗ av_freep(&s->zyklus);
149 ✗ }
150
151 ✗ static int config_props(AVFilterLink *outlink)
152 {
153 ✗ AVFilterContext *ctx = outlink->src;
154 ✗ MBContext *s = ctx->priv;
155
156 ✗ if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
157 ✗ return AVERROR(EINVAL);
158
159 ✗ outlink->w = s->w;
160 ✗ outlink->h = s->h;
161 ✗ outlink->time_base = av_inv_q(s->frame_rate);
162 ✗ outlink->frame_rate = s->frame_rate;
163
164 ✗ return 0;
165 }
166
167 ✗ static void fill_from_cache(AVFilterContext *ctx, uint32_t *color, int *in_cidx, int *out_cidx, double py, double scale){
168 ✗ MBContext *s = ctx->priv;
169 ✗ if(s->morphamp)
170 ✗ return;
171 ✗ for(; *in_cidx < s->cache_used; (*in_cidx)++){
172 ✗ Point *p= &s->point_cache[*in_cidx];
173 int x;
174 ✗ if(p->p[1] > py)
175 ✗ break;
176 ✗ x= lrint((p->p[0] - s->start_x) / scale + s->w/2);
177 ✗ if(x<0 || x >= s->w)
178 ✗ continue;
179 ✗ if(color) color[x] = p->val;
180 ✗ if(out_cidx && *out_cidx < s->cache_allocated)
181 ✗ s->next_cache[(*out_cidx)++]= *p;
182 }
183 }
184
185 ✗ static int interpol(MBContext *s, uint32_t *color, int x, int y, int linesize)
186 {
187 uint32_t a,b,c,d, i;
188 ✗ uint32_t ipol=0xFF000000;
189 int dist;
190
191 ✗ if(!x || !y || x+1==s->w || y+1==s->h)
192 ✗ return 0;
193
194 ✗ dist= FFMAX(FFABS(x-(s->w>>1))*s->h, FFABS(y-(s->h>>1))*s->w);
195
196 ✗ if(dist<(s->w*s->h>>3))
197 ✗ return 0;
198
199 ✗ a=color[(x+1) + (y+0)*linesize];
200 ✗ b=color[(x-1) + (y+1)*linesize];
201 ✗ c=color[(x+0) + (y+1)*linesize];
202 ✗ d=color[(x+1) + (y+1)*linesize];
203
204 ✗ if(a&&c){
205 ✗ b= color[(x-1) + (y+0)*linesize];
206 ✗ d= color[(x+0) + (y-1)*linesize];
207 ✗ }else if(b&&d){
208 ✗ a= color[(x+1) + (y-1)*linesize];
209 ✗ c= color[(x-1) + (y-1)*linesize];
210 ✗ }else if(c){
211 ✗ d= color[(x+0) + (y-1)*linesize];
212 ✗ a= color[(x-1) + (y+0)*linesize];
213 ✗ b= color[(x+1) + (y-1)*linesize];
214 ✗ }else if(d){
215 ✗ c= color[(x-1) + (y-1)*linesize];
216 ✗ a= color[(x-1) + (y+0)*linesize];
217 ✗ b= color[(x+1) + (y-1)*linesize];
218 }else
219 ✗ return 0;
220
221 ✗ for(i=0; i<3; i++){
222 ✗ int s= 8*i;
223 ✗ uint8_t ac= a>>s;
224 ✗ uint8_t bc= b>>s;
225 ✗ uint8_t cc= c>>s;
226 ✗ uint8_t dc= d>>s;
227 ✗ int ipolab= (ac + bc);
228 ✗ int ipolcd= (cc + dc);
229 ✗ if(FFABS(ipolab - ipolcd) > 5)
230 ✗ return 0;
231 ✗ if(FFABS(ac-bc)+FFABS(cc-dc) > 20)
232 ✗ return 0;
233 ✗ ipol |= ((ipolab + ipolcd + 2)/4)<<s;
234 }
235 ✗ color[x + y*linesize]= ipol;
236 ✗ return 1;
237 }
238
239 ✗ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, int64_t pts)
240 {
241 ✗ MBContext *s = ctx->priv;
242 ✗ int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx;
243 ✗ double scale= s->start_scale*pow(s->end_scale/s->start_scale, pts/s->end_pts);
244 ✗ int use_zyklus=0;
245 ✗ fill_from_cache(ctx, NULL, &in_cidx, NULL, s->start_y+scale*(-s->h/2-0.5), scale);
246 ✗ tmp_cidx= in_cidx;
247 ✗ memset(color, 0, sizeof(*color)*s->w);
248 ✗ for(y=0; y<s->h; y++){
249 ✗ int y1= y+1;
250 ✗ const double ci=s->start_y+scale*(y-s->h/2);
251 ✗ fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci, scale);
252 ✗ if(y1<s->h){
253 ✗ memset(color+linesize*y1, 0, sizeof(*color)*s->w);
254 ✗ fill_from_cache(ctx, color+linesize*y1, &tmp_cidx, NULL, ci + 3*scale/2, scale);
255 }
256
257 ✗ for(x=0; x<s->w; x++){
258 ✗ float av_uninit(epsilon);
259 ✗ const double cr=s->start_x+scale*(x-s->w/2);
260 ✗ double zr=cr;
261 ✗ double zi=ci;
262 ✗ uint32_t c=0;
263 ✗ double dv= s->dither / (double)(1LL<<32);
264 ✗ s->dither= s->dither*1664525+1013904223;
265
266 ✗ if(color[x + y*linesize] & 0xFF000000)
267 ✗ continue;
268 ✗ if(!s->morphamp){
269 ✗ if(interpol(s, color, x, y, linesize)){
270 ✗ if(next_cidx < s->cache_allocated){
271 ✗ s->next_cache[next_cidx ].p[0]= cr;
272 ✗ s->next_cache[next_cidx ].p[1]= ci;
273 ✗ s->next_cache[next_cidx++].val = color[x + y*linesize];
274 }
275 ✗ continue;
276 }
277 }else{
278 ✗ zr += cos(pts * s->morphxf) * s->morphamp;
279 ✗ zi += sin(pts * s->morphyf) * s->morphamp;
280 }
281
282 ✗ use_zyklus= (x==0 || s->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);
283 ✗ if(use_zyklus)
284 ✗ epsilon= scale*(abs(x-s->w/2) + abs(y-s->h/2))/s->w;
285
286 #define Z_Z2_C(outr,outi,inr,ini)\
287 outr= inr*inr - ini*ini + cr;\
288 outi= 2*inr*ini + ci;
289
290 #define Z_Z2_C_ZYKLUS(outr,outi,inr,ini, Z)\
291 Z_Z2_C(outr,outi,inr,ini)\
292 if(use_zyklus){\
293 if(Z && fabs(s->zyklus[i>>1][0]-outr)+fabs(s->zyklus[i>>1][1]-outi) <= epsilon)\
294 break;\
295 }\
296 s->zyklus[i][0]= outr;\
297 s->zyklus[i][1]= outi;\
298
299
300
301 ✗ for(i=0; i<s->maxiter-8; i++){
302 double t;
303 ✗ Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
304 ✗ i++;
305 ✗ Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
306 ✗ i++;
307 ✗ Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
308 ✗ i++;
309 ✗ Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
310 ✗ i++;
311 ✗ Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
312 ✗ i++;
313 ✗ Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
314 ✗ i++;
315 ✗ Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
316 ✗ i++;
317 ✗ Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
318 ✗ if(zr*zr + zi*zi > s->bailout){
319 ✗ i-= FFMIN(7, i);
320 ✗ for(; i<s->maxiter; i++){
321 ✗ zr= s->zyklus[i][0];
322 ✗ zi= s->zyklus[i][1];
323 ✗ if(zr*zr + zi*zi > s->bailout){
324 ✗ switch(s->outer){
325 ✗ case ITERATION_COUNT:
326 ✗ zr = i;
327 ✗ c = lrintf((sinf(zr)+1)*127) + lrintf((sinf(zr/1.234)+1)*127)*256*256 + lrintf((sinf(zr/100)+1)*127)*256;
328 ✗ break;
329 ✗ case NORMALIZED_ITERATION_COUNT:
330 ✗ zr = i + log2(log(s->bailout) / log(zr*zr + zi*zi));
331 ✗ c = lrintf((sinf(zr)+1)*127) + lrintf((sinf(zr/1.234)+1)*127)*256*256 + lrintf((sinf(zr/100)+1)*127)*256;
332 ✗ break;
333 ✗ case WHITE:
334 ✗ c = 0xFFFFFF;
335 ✗ break;
336 ✗ case OUTZ:
337 ✗ zr /= s->bailout;
338 ✗ zi /= s->bailout;
339 ✗ c = (((int)(zr*128+128))&0xFF)*256 + (((int)(zi*128+128))&0xFF);
340 }
341 ✗ break;
342 }
343 }
344 ✗ break;
345 }
346 }
347 ✗ if(!c){
348 ✗ if(s->inner==PERIOD){
349 int j;
350 ✗ for(j=i-1; j; j--)
351 ✗ if(SQR(s->zyklus[j][0]-zr) + SQR(s->zyklus[j][1]-zi) < epsilon*epsilon*10)
352 ✗ break;
353 ✗ if(j){
354 ✗ c= i-j;
355 ✗ c= ((c<<5)&0xE0) + ((c<<10)&0xE000) + ((c<<15)&0xE00000);
356 }
357 ✗ }else if(s->inner==CONVTIME){
358 ✗ c= floor(i*255.0/s->maxiter+dv)*0x010101;
359 ✗ } else if(s->inner==MINCOL){
360 int j;
361 ✗ double closest=9999;
362 ✗ int closest_index=0;
363 ✗ for(j=i-1; j>=0; j--)
364 ✗ if(SQR(s->zyklus[j][0]) + SQR(s->zyklus[j][1]) < closest){
365 ✗ closest= SQR(s->zyklus[j][0]) + SQR(s->zyklus[j][1]);
366 ✗ closest_index= j;
367 }
368 ✗ closest = sqrt(closest);
369 ✗ c= lrintf((s->zyklus[closest_index][0]/closest+1)*127+dv) + lrintf((s->zyklus[closest_index][1]/closest+1)*127+dv)*256;
370 }
371 }
372 ✗ c |= 0xFF000000;
373 ✗ color[x + y*linesize]= c;
374 ✗ if(next_cidx < s->cache_allocated){
375 ✗ s->next_cache[next_cidx ].p[0]= cr;
376 ✗ s->next_cache[next_cidx ].p[1]= ci;
377 ✗ s->next_cache[next_cidx++].val = c;
378 }
379 }
380 ✗ fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci + scale/2, scale);
381 }
382 ✗ FFSWAP(void*, s->next_cache, s->point_cache);
383 ✗ s->cache_used = next_cidx;
384 ✗ if(s->cache_used == s->cache_allocated)
385 ✗ av_log(ctx, AV_LOG_INFO, "Mandelbrot cache is too small!\n");
386 ✗ }
387
388 ✗ static int request_frame(AVFilterLink *link)
389 {
390 ✗ MBContext *s = link->src->priv;
391 ✗ AVFrame *picref = ff_get_video_buffer(link, s->w, s->h);
392 ✗ if (!picref)
393 ✗ return AVERROR(ENOMEM);
394
395 ✗ picref->sample_aspect_ratio = (AVRational) {1, 1};
396 ✗ picref->pts = s->pts++;
397 ✗ picref->duration = 1;
398
399 ✗ draw_mandelbrot(link->src, (uint32_t*)picref->data[0], picref->linesize[0]/4, picref->pts);
400 ✗ return ff_filter_frame(link, picref);
401 }
402
403 static const AVFilterPad mandelbrot_outputs[] = {
404 {
405 .name = "default",
406 .type = AVMEDIA_TYPE_VIDEO,
407 .request_frame = request_frame,
408 .config_props = config_props,
409 },
410 };
411
412 const AVFilter ff_vsrc_mandelbrot = {
413 .name = "mandelbrot",
414 .description = NULL_IF_CONFIG_SMALL("Render a Mandelbrot fractal."),
415 .priv_size = sizeof(MBContext),
416 .priv_class = &mandelbrot_class,
417 .init = init,
418 .uninit = uninit,
419 .inputs = NULL,
420 FILTER_OUTPUTS(mandelbrot_outputs),
421 FILTER_SINGLE_PIXFMT(AV_PIX_FMT_0BGR32),
422 };
423