| /* |
| * Copyright (c) 2011 Michael Niedermayer |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser 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 |
| * |
| * The vsrc_color filter from Stefano Sabatini was used as template to create |
| * this |
| */ |
| |
| /** |
| * @file |
| * Mandelbrot fraktal renderer |
| */ |
| |
| #include "avfilter.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include <float.h> |
| #include <math.h> |
| |
| #define SQR(a) ((a)*(a)) |
| |
| enum Outer{ |
| ITERATION_COUNT, |
| NORMALIZED_ITERATION_COUNT, |
| }; |
| |
| enum Inner{ |
| BLACK, |
| PERIOD, |
| CONVTIME, |
| MINCOL, |
| }; |
| |
| typedef struct Point { |
| double p[2]; |
| uint32_t val; |
| } Point; |
| |
| typedef struct { |
| const AVClass *class; |
| int w, h; |
| AVRational time_base; |
| uint64_t pts; |
| char *size, *rate; |
| int maxiter; |
| double start_x; |
| double start_y; |
| double start_scale; |
| double end_scale; |
| double end_pts; |
| double bailout; |
| enum Outer outer; |
| enum Inner inner; |
| int cache_allocated; |
| int cache_used; |
| Point *point_cache; |
| Point *next_cache; |
| double (*zyklus)[2]; |
| uint32_t dither; |
| } MBContext; |
| |
| #define OFFSET(x) offsetof(MBContext, x) |
| |
| static const AVOption mandelbrot_options[] = { |
| {"size", "set frame size", OFFSET(size), AV_OPT_TYPE_STRING, {.str="640x480"}, CHAR_MIN, CHAR_MAX }, |
| {"s", "set frame size", OFFSET(size), AV_OPT_TYPE_STRING, {.str="640x480"}, CHAR_MIN, CHAR_MAX }, |
| {"rate", "set frame rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str="25"}, CHAR_MIN, CHAR_MAX }, |
| {"r", "set frame rate", OFFSET(rate), AV_OPT_TYPE_STRING, {.str="25"}, CHAR_MIN, CHAR_MAX }, |
| {"maxiter", "set max iterations number", OFFSET(maxiter), AV_OPT_TYPE_INT, {.dbl=7189}, 1, INT_MAX }, |
| {"start_x", "set the initial x position", OFFSET(start_x), AV_OPT_TYPE_DOUBLE, {.dbl=-0.743643887037158704752191506114774}, -100, 100 }, |
| {"start_y", "set the initial y position", OFFSET(start_y), AV_OPT_TYPE_DOUBLE, {.dbl=-0.131825904205311970493132056385139}, -100, 100 }, |
| {"start_scale", "set the initial scale value", OFFSET(start_scale), AV_OPT_TYPE_DOUBLE, {.dbl=3.0}, 0, FLT_MAX }, |
| {"end_scale", "set the terminal scale value", OFFSET(end_scale), AV_OPT_TYPE_DOUBLE, {.dbl=0.3}, 0, FLT_MAX }, |
| {"end_pts", "set the terminal pts value", OFFSET(end_pts), AV_OPT_TYPE_DOUBLE, {.dbl=400}, 0, INT64_MAX }, |
| {"bailout", "set the bailout value", OFFSET(bailout), AV_OPT_TYPE_DOUBLE, {.dbl=10}, 0, FLT_MAX }, |
| |
| {"outer", "set outer coloring mode", OFFSET(outer), AV_OPT_TYPE_INT, {.dbl=NORMALIZED_ITERATION_COUNT}, 0, INT_MAX, 0, "outer"}, |
| {"iteration_count", "set iteration count mode", 0, AV_OPT_TYPE_CONST, {.dbl=ITERATION_COUNT}, INT_MIN, INT_MAX, 0, "outer" }, |
| {"normalized_iteration_count", "set normalized iteration count mode", 0, AV_OPT_TYPE_CONST, {.dbl=NORMALIZED_ITERATION_COUNT}, INT_MIN, INT_MAX, 0, "outer" }, |
| |
| {"inner", "set inner coloring mode", OFFSET(inner), AV_OPT_TYPE_INT, {.dbl=MINCOL}, 0, INT_MAX, 0, "inner"}, |
| {"black", "set black mode", 0, AV_OPT_TYPE_CONST, {.dbl=BLACK}, INT_MIN, INT_MAX, 0, "inner" }, |
| {"period", "set period mode", 0, AV_OPT_TYPE_CONST, {.dbl=PERIOD}, INT_MIN, INT_MAX, 0, "inner" }, |
| {"convergence", "show time until convergence", 0, AV_OPT_TYPE_CONST, {.dbl=CONVTIME}, INT_MIN, INT_MAX, 0, "inner" }, |
| {"mincol", "color based on point closest to the origin of the iterations", 0, AV_OPT_TYPE_CONST, {.dbl=MINCOL}, INT_MIN, INT_MAX, 0, "inner" }, |
| |
| {NULL}, |
| }; |
| |
| static const char *mandelbrot_get_name(void *ctx) |
| { |
| return "mandelbrot"; |
| } |
| |
| static const AVClass mandelbrot_class = { |
| "MBContext", |
| mandelbrot_get_name, |
| mandelbrot_options |
| }; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| MBContext *mb = ctx->priv; |
| AVRational rate_q; |
| int err; |
| |
| mb->class = &mandelbrot_class; |
| av_opt_set_defaults(mb); |
| |
| if ((err = (av_set_options_string(mb, args, "=", ":"))) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args); |
| return err; |
| } |
| mb->bailout *= mb->bailout; |
| |
| if (av_parse_video_size(&mb->w, &mb->h, mb->size) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", mb->size); |
| return AVERROR(EINVAL); |
| } |
| mb->start_scale /=mb->h; |
| mb->end_scale /=mb->h; |
| |
| if (av_parse_video_rate(&rate_q, mb->rate) < 0 || |
| rate_q.den <= 0 || rate_q.num <= 0) { |
| av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", mb->rate); |
| return AVERROR(EINVAL); |
| } |
| mb->time_base.num = rate_q.den; |
| mb->time_base.den = rate_q.num; |
| |
| mb->cache_allocated = mb->w * mb->h * 3; |
| mb->cache_used = 0; |
| mb->point_cache= av_malloc(sizeof(*mb->point_cache)*mb->cache_allocated); |
| mb-> next_cache= av_malloc(sizeof(*mb-> next_cache)*mb->cache_allocated); |
| mb-> zyklus = av_malloc(sizeof(*mb->zyklus) * (mb->maxiter+16)); |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| MBContext *mb = ctx->priv; |
| |
| av_freep(&mb->size); |
| av_freep(&mb->rate); |
| av_freep(&mb->point_cache); |
| av_freep(&mb-> next_cache); |
| av_freep(&mb->zyklus); |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| static const enum PixelFormat pix_fmts[] = { |
| PIX_FMT_BGR32, |
| PIX_FMT_NONE |
| }; |
| |
| avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| return 0; |
| } |
| |
| static int config_props(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->src; |
| MBContext *mb = ctx->priv; |
| |
| if (av_image_check_size(mb->w, mb->h, 0, ctx) < 0) |
| return AVERROR(EINVAL); |
| |
| inlink->w = mb->w; |
| inlink->h = mb->h; |
| inlink->time_base = mb->time_base; |
| |
| return 0; |
| } |
| |
| static void fill_from_cache(AVFilterContext *ctx, uint32_t *color, int *in_cidx, int *out_cidx, double py, double scale){ |
| MBContext *mb = ctx->priv; |
| for(; *in_cidx < mb->cache_used; (*in_cidx)++){ |
| Point *p= &mb->point_cache[*in_cidx]; |
| int x; |
| if(p->p[1] > py) |
| break; |
| x= round((p->p[0] - mb->start_x) / scale + mb->w/2); |
| if(x<0 || x >= mb->w) |
| continue; |
| if(color) color[x] = p->val; |
| if(out_cidx && *out_cidx < mb->cache_allocated) |
| mb->next_cache[(*out_cidx)++]= *p; |
| } |
| } |
| |
| static int interpol(MBContext *mb, uint32_t *color, int x, int y, int linesize) |
| { |
| uint32_t a,b,c,d, i; |
| uint32_t ipol=0xFF000000; |
| int dist; |
| |
| if(!x || !y || x+1==mb->w || y+1==mb->h) |
| return 0; |
| |
| dist= FFMAX(FFABS(x-(mb->w>>1))*mb->h, FFABS(y-(mb->h>>1))*mb->w); |
| |
| if(dist<(mb->w*mb->h>>3)) |
| return 0; |
| |
| a=color[(x+1) + (y+0)*linesize]; |
| b=color[(x-1) + (y+1)*linesize]; |
| c=color[(x+0) + (y+1)*linesize]; |
| d=color[(x+1) + (y+1)*linesize]; |
| |
| if(a&&c){ |
| b= color[(x-1) + (y+0)*linesize]; |
| d= color[(x+0) + (y-1)*linesize]; |
| }else if(b&&d){ |
| a= color[(x+1) + (y-1)*linesize]; |
| c= color[(x-1) + (y-1)*linesize]; |
| }else if(c){ |
| d= color[(x+0) + (y-1)*linesize]; |
| a= color[(x-1) + (y+0)*linesize]; |
| b= color[(x+1) + (y-1)*linesize]; |
| }else if(d){ |
| c= color[(x-1) + (y-1)*linesize]; |
| a= color[(x-1) + (y+0)*linesize]; |
| b= color[(x+1) + (y-1)*linesize]; |
| }else |
| return 0; |
| |
| for(i=0; i<3; i++){ |
| int s= 8*i; |
| uint8_t ac= a>>s; |
| uint8_t bc= b>>s; |
| uint8_t cc= c>>s; |
| uint8_t dc= d>>s; |
| int ipolab= (ac + bc); |
| int ipolcd= (cc + dc); |
| if(FFABS(ipolab - ipolcd) > 5) |
| return 0; |
| if(FFABS(ac-bc)+FFABS(cc-dc) > 20) |
| return 0; |
| ipol |= ((ipolab + ipolcd + 2)/4)<<s; |
| } |
| color[x + y*linesize]= ipol; |
| return 1; |
| } |
| |
| static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, int64_t pts) |
| { |
| MBContext *mb = ctx->priv; |
| int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx; |
| double scale= mb->start_scale*pow(mb->end_scale/mb->start_scale, pts/mb->end_pts); |
| int use_zyklus=0; |
| fill_from_cache(ctx, NULL, &in_cidx, NULL, mb->start_y+scale*(-mb->h/2-0.5), scale); |
| tmp_cidx= in_cidx; |
| memset(color, 0, sizeof(*color)*mb->w); |
| for(y=0; y<mb->h; y++){ |
| int y1= y+1; |
| const double ci=mb->start_y+scale*(y-mb->h/2); |
| fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci, scale); |
| if(y1<mb->h){ |
| memset(color+linesize*y1, 0, sizeof(*color)*mb->w); |
| fill_from_cache(ctx, color+linesize*y1, &tmp_cidx, NULL, ci + 3*scale/2, scale); |
| } |
| |
| for(x=0; x<mb->w; x++){ |
| float av_uninit(epsilon); |
| const double cr=mb->start_x+scale*(x-mb->w/2); |
| double zr=cr; |
| double zi=ci; |
| uint32_t c=0; |
| double dv= mb->dither / (double)(1LL<<32); |
| mb->dither= mb->dither*1664525+1013904223; |
| |
| if(color[x + y*linesize] & 0xFF000000) |
| continue; |
| if(interpol(mb, color, x, y, linesize)){ |
| if(next_cidx < mb->cache_allocated){ |
| mb->next_cache[next_cidx ].p[0]= cr; |
| mb->next_cache[next_cidx ].p[1]= ci; |
| mb->next_cache[next_cidx++].val = color[x + y*linesize]; |
| } |
| continue; |
| } |
| |
| use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000); |
| if(use_zyklus) |
| epsilon= scale*1*sqrt(SQR(x-mb->w/2) + SQR(y-mb->h/2))/mb->w; |
| |
| #define Z_Z2_C(outr,outi,inr,ini)\ |
| outr= inr*inr - ini*ini + cr;\ |
| outi= 2*inr*ini + ci; |
| |
| #define Z_Z2_C_ZYKLUS(outr,outi,inr,ini, Z)\ |
| Z_Z2_C(outr,outi,inr,ini)\ |
| if(use_zyklus){\ |
| if(Z && fabs(mb->zyklus[i>>1][0]-outr)+fabs(mb->zyklus[i>>1][1]-outi) <= epsilon)\ |
| break;\ |
| }\ |
| mb->zyklus[i][0]= outr;\ |
| mb->zyklus[i][1]= outi;\ |
| |
| |
| |
| for(i=0; i<mb->maxiter-8; i++){ |
| double t; |
| Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
| i++; |
| Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
| i++; |
| Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
| i++; |
| Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
| i++; |
| Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
| i++; |
| Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
| i++; |
| Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
| i++; |
| Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
| if(zr*zr + zi*zi > mb->bailout){ |
| i-= FFMIN(7, i); |
| for(; i<mb->maxiter; i++){ |
| zr= mb->zyklus[i][0]; |
| zi= mb->zyklus[i][1]; |
| if(zr*zr + zi*zi > mb->bailout){ |
| switch(mb->outer){ |
| case ITERATION_COUNT: zr = i; break; |
| case NORMALIZED_ITERATION_COUNT: zr= i + log2(log(mb->bailout) / log(zr*zr + zi*zi)); break; |
| } |
| c= lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256; |
| break; |
| } |
| } |
| break; |
| } |
| } |
| if(!c){ |
| if(mb->inner==PERIOD){ |
| int j; |
| for(j=i-1; j; j--) |
| if(SQR(mb->zyklus[j][0]-zr) + SQR(mb->zyklus[j][1]-zi) < epsilon*epsilon*10) |
| break; |
| if(j){ |
| c= i-j; |
| c= ((c<<5)&0xE0) + ((c<<16)&0xE000) + ((c<<27)&0xE00000); |
| } |
| }else if(mb->inner==CONVTIME){ |
| c= floor(i*255.0/mb->maxiter+dv)*0x010101; |
| } else if(mb->inner==MINCOL){ |
| int j; |
| double closest=9999; |
| int closest_index=0; |
| for(j=i-1; j>=0; j--) |
| if(SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]) < closest){ |
| closest= SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]); |
| closest_index= j; |
| } |
| closest = sqrt(closest); |
| c= lrintf((mb->zyklus[closest_index][0]/closest+1)*127+dv) + lrintf((mb->zyklus[closest_index][1]/closest+1)*127+dv)*256; |
| } |
| } |
| c |= 0xFF000000; |
| color[x + y*linesize]= c; |
| if(next_cidx < mb->cache_allocated){ |
| mb->next_cache[next_cidx ].p[0]= cr; |
| mb->next_cache[next_cidx ].p[1]= ci; |
| mb->next_cache[next_cidx++].val = c; |
| } |
| } |
| fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci + scale/2, scale); |
| } |
| FFSWAP(void*, mb->next_cache, mb->point_cache); |
| mb->cache_used = next_cidx; |
| if(mb->cache_used == mb->cache_allocated) |
| av_log(0, AV_LOG_INFO, "Mandelbrot cache is too small!\n"); |
| } |
| |
| static int request_frame(AVFilterLink *link) |
| { |
| MBContext *mb = link->src->priv; |
| AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, mb->w, mb->h); |
| picref->video->sample_aspect_ratio = (AVRational) {1, 1}; |
| picref->pts = mb->pts++; |
| picref->pos = -1; |
| |
| avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0)); |
| draw_mandelbrot(link->src, (uint32_t*)picref->data[0], picref->linesize[0]/4, picref->pts); |
| avfilter_draw_slice(link, 0, mb->h, 1); |
| avfilter_end_frame(link); |
| avfilter_unref_buffer(picref); |
| |
| return 0; |
| } |
| |
| AVFilter avfilter_vsrc_mandelbrot = { |
| .name = "mandelbrot", |
| .description = NULL_IF_CONFIG_SMALL("Render a Mandelbrot fractal."), |
| |
| .priv_size = sizeof(MBContext), |
| .init = init, |
| .uninit = uninit, |
| |
| .query_formats = query_formats, |
| |
| .inputs = (const AVFilterPad[]) {{ .name = NULL}}, |
| |
| .outputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .request_frame = request_frame, |
| .config_props = config_props }, |
| { .name = NULL}}, |
| }; |
