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Diffstat (limited to 'libavfilter/vsrc_mandelbrot.c')
-rw-r--r-- | libavfilter/vsrc_mandelbrot.c | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c new file mode 100644 index 0000000..255f2db --- /dev/null +++ b/libavfilter/vsrc_mandelbrot.c @@ -0,0 +1,430 @@ +/* + * 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 "formats.h" +#include "video.h" +#include "internal.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, + WHITE, + OUTZ, +}; + +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 frame_rate; + uint64_t pts; + 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; + + double morphxf; + double morphyf; + double morphamp; +} MBContext; + +#define OFFSET(x) offsetof(MBContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +static const AVOption mandelbrot_options[] = { + {"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, CHAR_MIN, CHAR_MAX, FLAGS }, + {"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, CHAR_MIN, CHAR_MAX, FLAGS }, + {"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, CHAR_MIN, CHAR_MAX, FLAGS }, + {"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, CHAR_MIN, CHAR_MAX, FLAGS }, + {"maxiter", "set max iterations number", OFFSET(maxiter), AV_OPT_TYPE_INT, {.i64=7189}, 1, INT_MAX, FLAGS }, + {"start_x", "set the initial x position", OFFSET(start_x), AV_OPT_TYPE_DOUBLE, {.dbl=-0.743643887037158704752191506114774}, -100, 100, FLAGS }, + {"start_y", "set the initial y position", OFFSET(start_y), AV_OPT_TYPE_DOUBLE, {.dbl=-0.131825904205311970493132056385139}, -100, 100, FLAGS }, + {"start_scale", "set the initial scale value", OFFSET(start_scale), AV_OPT_TYPE_DOUBLE, {.dbl=3.0}, 0, FLT_MAX, FLAGS }, + {"end_scale", "set the terminal scale value", OFFSET(end_scale), AV_OPT_TYPE_DOUBLE, {.dbl=0.3}, 0, FLT_MAX, FLAGS }, + {"end_pts", "set the terminal pts value", OFFSET(end_pts), AV_OPT_TYPE_DOUBLE, {.dbl=400}, 0, INT64_MAX, FLAGS }, + {"bailout", "set the bailout value", OFFSET(bailout), AV_OPT_TYPE_DOUBLE, {.dbl=10}, 0, FLT_MAX, FLAGS }, + {"morphxf", "set morph x frequency", OFFSET(morphxf), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, -FLT_MAX, FLT_MAX, FLAGS }, + {"morphyf", "set morph y frequency", OFFSET(morphyf), AV_OPT_TYPE_DOUBLE, {.dbl=0.0123}, -FLT_MAX, FLT_MAX, FLAGS }, + {"morphamp", "set morph amplitude", OFFSET(morphamp), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS }, + + {"outer", "set outer coloring mode", OFFSET(outer), AV_OPT_TYPE_INT, {.i64=NORMALIZED_ITERATION_COUNT}, 0, INT_MAX, FLAGS, "outer" }, + {"iteration_count", "set iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, "outer" }, + {"normalized_iteration_count", "set normalized iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=NORMALIZED_ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, "outer" }, + {"white", "set white mode", 0, AV_OPT_TYPE_CONST, {.i64=WHITE}, INT_MIN, INT_MAX, FLAGS, "outer" }, + {"outz", "set outz mode", 0, AV_OPT_TYPE_CONST, {.i64=OUTZ}, INT_MIN, INT_MAX, FLAGS, "outer" }, + + {"inner", "set inner coloring mode", OFFSET(inner), AV_OPT_TYPE_INT, {.i64=MINCOL}, 0, INT_MAX, FLAGS, "inner" }, + {"black", "set black mode", 0, AV_OPT_TYPE_CONST, {.i64=BLACK}, INT_MIN, INT_MAX, FLAGS, "inner"}, + {"period", "set period mode", 0, AV_OPT_TYPE_CONST, {.i64=PERIOD}, INT_MIN, INT_MAX, FLAGS, "inner"}, + {"convergence", "show time until convergence", 0, AV_OPT_TYPE_CONST, {.i64=CONVTIME}, INT_MIN, INT_MAX, FLAGS, "inner"}, + {"mincol", "color based on point closest to the origin of the iterations", 0, AV_OPT_TYPE_CONST, {.i64=MINCOL}, INT_MIN, INT_MAX, FLAGS, "inner"}, + + {NULL}, +}; + +AVFILTER_DEFINE_CLASS(mandelbrot); + +static av_cold int init(AVFilterContext *ctx) +{ + MBContext *mb = ctx->priv; + + mb->bailout *= mb->bailout; + + mb->start_scale /=mb->h; + mb->end_scale /=mb->h; + + mb->cache_allocated = mb->w * mb->h * 3; + mb->cache_used = 0; + mb->point_cache= av_malloc_array(mb->cache_allocated, sizeof(*mb->point_cache)); + mb-> next_cache= av_malloc_array(mb->cache_allocated, sizeof(*mb-> next_cache)); + mb-> zyklus = av_malloc_array(mb->maxiter + 16, sizeof(*mb->zyklus)); + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + MBContext *mb = ctx->priv; + + av_freep(&mb->point_cache); + av_freep(&mb-> next_cache); + av_freep(&mb->zyklus); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_BGR32, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_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 = av_inv_q(mb->frame_rate); + + 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; + if(mb->morphamp) + return; + 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(!mb->morphamp){ + 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; + } + }else{ + zr += cos(pts * mb->morphxf) * mb->morphamp; + zi += sin(pts * mb->morphyf) * mb->morphamp; + } + + 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; + c = lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256; + break; + case NORMALIZED_ITERATION_COUNT: + zr = i + log2(log(mb->bailout) / log(zr*zr + zi*zi)); + c = lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256; + break; + case WHITE: + c = 0xFFFFFF; + break; + case OUTZ: + zr /= mb->bailout; + zi /= mb->bailout; + c = (((int)(zr*128+128))&0xFF)*256 + (((int)(zi*128+128))&0xFF); + } + 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<<10)&0xE000) + ((c<<15)&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(ctx, AV_LOG_INFO, "Mandelbrot cache is too small!\n"); +} + +static int request_frame(AVFilterLink *link) +{ + MBContext *mb = link->src->priv; + AVFrame *picref = ff_get_video_buffer(link, mb->w, mb->h); + if (!picref) + return AVERROR(ENOMEM); + + picref->sample_aspect_ratio = (AVRational) {1, 1}; + picref->pts = mb->pts++; + + draw_mandelbrot(link->src, (uint32_t*)picref->data[0], picref->linesize[0]/4, picref->pts); + return ff_filter_frame(link, picref); +} + +static const AVFilterPad mandelbrot_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .request_frame = request_frame, + .config_props = config_props, + }, + { NULL } +}; + +AVFilter ff_vsrc_mandelbrot = { + .name = "mandelbrot", + .description = NULL_IF_CONFIG_SMALL("Render a Mandelbrot fractal."), + .priv_size = sizeof(MBContext), + .priv_class = &mandelbrot_class, + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .inputs = NULL, + .outputs = mandelbrot_outputs, +}; |