436 lines
16 KiB
C
436 lines
16 KiB
C
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/*
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* Copyright (c) 2011 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* The vsrc_color filter from Stefano Sabatini was used as template to create
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* this
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*/
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/**
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* @file
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* Mandelbrot fractal renderer
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*/
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#include "avfilter.h"
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#include "formats.h"
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#include "video.h"
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#include "internal.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include <float.h>
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#include <math.h>
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#define SQR(a) ((a)*(a))
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enum Outer{
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ITERATION_COUNT,
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NORMALIZED_ITERATION_COUNT,
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WHITE,
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OUTZ,
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};
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enum Inner{
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BLACK,
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PERIOD,
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CONVTIME,
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MINCOL,
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};
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typedef struct Point {
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double p[2];
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uint32_t val;
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} Point;
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typedef struct MBContext {
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const AVClass *class;
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int w, h;
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AVRational frame_rate;
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uint64_t pts;
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int maxiter;
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double start_x;
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double start_y;
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double start_scale;
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double end_scale;
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double end_pts;
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double bailout;
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int outer;
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int inner;
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int cache_allocated;
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int cache_used;
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Point *point_cache;
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Point *next_cache;
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double (*zyklus)[2];
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uint32_t dither;
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double morphxf;
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double morphyf;
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double morphamp;
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} MBContext;
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#define OFFSET(x) offsetof(MBContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption mandelbrot_options[] = {
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{"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
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{"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
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{"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
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{"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
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{"maxiter", "set max iterations number", OFFSET(maxiter), AV_OPT_TYPE_INT, {.i64=7189}, 1, INT_MAX, FLAGS },
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{"start_x", "set the initial x position", OFFSET(start_x), AV_OPT_TYPE_DOUBLE, {.dbl=-0.743643887037158704752191506114774}, -100, 100, FLAGS },
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{"start_y", "set the initial y position", OFFSET(start_y), AV_OPT_TYPE_DOUBLE, {.dbl=-0.131825904205311970493132056385139}, -100, 100, FLAGS },
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{"start_scale", "set the initial scale value", OFFSET(start_scale), AV_OPT_TYPE_DOUBLE, {.dbl=3.0}, 0, FLT_MAX, FLAGS },
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{"end_scale", "set the terminal scale value", OFFSET(end_scale), AV_OPT_TYPE_DOUBLE, {.dbl=0.3}, 0, FLT_MAX, FLAGS },
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{"end_pts", "set the terminal pts value", OFFSET(end_pts), AV_OPT_TYPE_DOUBLE, {.dbl=400}, 0, INT64_MAX, FLAGS },
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{"bailout", "set the bailout value", OFFSET(bailout), AV_OPT_TYPE_DOUBLE, {.dbl=10}, 0, FLT_MAX, FLAGS },
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{"morphxf", "set morph x frequency", OFFSET(morphxf), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, -FLT_MAX, FLT_MAX, FLAGS },
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{"morphyf", "set morph y frequency", OFFSET(morphyf), AV_OPT_TYPE_DOUBLE, {.dbl=0.0123}, -FLT_MAX, FLT_MAX, FLAGS },
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{"morphamp", "set morph amplitude", OFFSET(morphamp), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
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{"outer", "set outer coloring mode", OFFSET(outer), AV_OPT_TYPE_INT, {.i64=NORMALIZED_ITERATION_COUNT}, 0, INT_MAX, FLAGS, "outer" },
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{"iteration_count", "set iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, "outer" },
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{"normalized_iteration_count", "set normalized iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=NORMALIZED_ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, "outer" },
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{"white", "set white mode", 0, AV_OPT_TYPE_CONST, {.i64=WHITE}, INT_MIN, INT_MAX, FLAGS, "outer" },
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{"outz", "set outz mode", 0, AV_OPT_TYPE_CONST, {.i64=OUTZ}, INT_MIN, INT_MAX, FLAGS, "outer" },
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{"inner", "set inner coloring mode", OFFSET(inner), AV_OPT_TYPE_INT, {.i64=MINCOL}, 0, INT_MAX, FLAGS, "inner" },
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{"black", "set black mode", 0, AV_OPT_TYPE_CONST, {.i64=BLACK}, INT_MIN, INT_MAX, FLAGS, "inner"},
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{"period", "set period mode", 0, AV_OPT_TYPE_CONST, {.i64=PERIOD}, INT_MIN, INT_MAX, FLAGS, "inner"},
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{"convergence", "show time until convergence", 0, AV_OPT_TYPE_CONST, {.i64=CONVTIME}, INT_MIN, INT_MAX, FLAGS, "inner"},
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{"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"},
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(mandelbrot);
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static av_cold int init(AVFilterContext *ctx)
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{
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MBContext *s = ctx->priv;
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s->bailout *= s->bailout;
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s->start_scale /=s->h;
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s->end_scale /=s->h;
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s->cache_allocated = s->w * s->h * 3;
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s->cache_used = 0;
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s->point_cache= av_malloc_array(s->cache_allocated, sizeof(*s->point_cache));
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s-> next_cache= av_malloc_array(s->cache_allocated, sizeof(*s-> next_cache));
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s-> zyklus = av_malloc_array(s->maxiter + 16, sizeof(*s->zyklus));
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if (!s->point_cache || !s->next_cache || !s->zyklus)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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MBContext *s = ctx->priv;
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av_freep(&s->point_cache);
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av_freep(&s-> next_cache);
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av_freep(&s->zyklus);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_0BGR32,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int config_props(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->src;
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MBContext *s = ctx->priv;
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if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
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return AVERROR(EINVAL);
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inlink->w = s->w;
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inlink->h = s->h;
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inlink->time_base = av_inv_q(s->frame_rate);
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return 0;
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}
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static void fill_from_cache(AVFilterContext *ctx, uint32_t *color, int *in_cidx, int *out_cidx, double py, double scale){
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MBContext *s = ctx->priv;
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if(s->morphamp)
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return;
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for(; *in_cidx < s->cache_used; (*in_cidx)++){
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Point *p= &s->point_cache[*in_cidx];
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int x;
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if(p->p[1] > py)
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break;
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x= lrint((p->p[0] - s->start_x) / scale + s->w/2);
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if(x<0 || x >= s->w)
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continue;
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if(color) color[x] = p->val;
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if(out_cidx && *out_cidx < s->cache_allocated)
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s->next_cache[(*out_cidx)++]= *p;
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}
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}
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static int interpol(MBContext *s, uint32_t *color, int x, int y, int linesize)
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{
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uint32_t a,b,c,d, i;
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uint32_t ipol=0xFF000000;
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int dist;
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if(!x || !y || x+1==s->w || y+1==s->h)
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return 0;
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dist= FFMAX(FFABS(x-(s->w>>1))*s->h, FFABS(y-(s->h>>1))*s->w);
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if(dist<(s->w*s->h>>3))
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return 0;
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a=color[(x+1) + (y+0)*linesize];
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b=color[(x-1) + (y+1)*linesize];
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c=color[(x+0) + (y+1)*linesize];
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d=color[(x+1) + (y+1)*linesize];
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if(a&&c){
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b= color[(x-1) + (y+0)*linesize];
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d= color[(x+0) + (y-1)*linesize];
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}else if(b&&d){
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a= color[(x+1) + (y-1)*linesize];
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c= color[(x-1) + (y-1)*linesize];
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}else if(c){
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d= color[(x+0) + (y-1)*linesize];
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a= color[(x-1) + (y+0)*linesize];
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b= color[(x+1) + (y-1)*linesize];
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}else if(d){
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c= color[(x-1) + (y-1)*linesize];
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a= color[(x-1) + (y+0)*linesize];
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b= color[(x+1) + (y-1)*linesize];
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}else
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return 0;
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for(i=0; i<3; i++){
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int s= 8*i;
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uint8_t ac= a>>s;
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uint8_t bc= b>>s;
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uint8_t cc= c>>s;
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uint8_t dc= d>>s;
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int ipolab= (ac + bc);
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int ipolcd= (cc + dc);
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if(FFABS(ipolab - ipolcd) > 5)
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return 0;
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if(FFABS(ac-bc)+FFABS(cc-dc) > 20)
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return 0;
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ipol |= ((ipolab + ipolcd + 2)/4)<<s;
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}
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color[x + y*linesize]= ipol;
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return 1;
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}
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static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, int64_t pts)
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{
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MBContext *s = ctx->priv;
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int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx;
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double scale= s->start_scale*pow(s->end_scale/s->start_scale, pts/s->end_pts);
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int use_zyklus=0;
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fill_from_cache(ctx, NULL, &in_cidx, NULL, s->start_y+scale*(-s->h/2-0.5), scale);
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tmp_cidx= in_cidx;
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memset(color, 0, sizeof(*color)*s->w);
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for(y=0; y<s->h; y++){
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int y1= y+1;
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const double ci=s->start_y+scale*(y-s->h/2);
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fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci, scale);
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if(y1<s->h){
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memset(color+linesize*y1, 0, sizeof(*color)*s->w);
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fill_from_cache(ctx, color+linesize*y1, &tmp_cidx, NULL, ci + 3*scale/2, scale);
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}
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for(x=0; x<s->w; x++){
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float av_uninit(epsilon);
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const double cr=s->start_x+scale*(x-s->w/2);
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double zr=cr;
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double zi=ci;
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uint32_t c=0;
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double dv= s->dither / (double)(1LL<<32);
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s->dither= s->dither*1664525+1013904223;
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if(color[x + y*linesize] & 0xFF000000)
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continue;
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if(!s->morphamp){
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if(interpol(s, color, x, y, linesize)){
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if(next_cidx < s->cache_allocated){
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s->next_cache[next_cidx ].p[0]= cr;
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s->next_cache[next_cidx ].p[1]= ci;
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s->next_cache[next_cidx++].val = color[x + y*linesize];
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}
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continue;
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}
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}else{
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zr += cos(pts * s->morphxf) * s->morphamp;
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zi += sin(pts * s->morphyf) * s->morphamp;
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}
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use_zyklus= (x==0 || s->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);
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if(use_zyklus)
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epsilon= scale*(abs(x-s->w/2) + abs(y-s->h/2))/s->w;
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#define Z_Z2_C(outr,outi,inr,ini)\
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outr= inr*inr - ini*ini + cr;\
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outi= 2*inr*ini + ci;
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#define Z_Z2_C_ZYKLUS(outr,outi,inr,ini, Z)\
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Z_Z2_C(outr,outi,inr,ini)\
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if(use_zyklus){\
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if(Z && fabs(s->zyklus[i>>1][0]-outr)+fabs(s->zyklus[i>>1][1]-outi) <= epsilon)\
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break;\
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}\
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s->zyklus[i][0]= outr;\
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s->zyklus[i][1]= outi;\
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for(i=0; i<s->maxiter-8; i++){
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double t;
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Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)
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i++;
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Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)
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i++;
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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 > s->bailout){
|
||
|
|
i-= FFMIN(7, i);
|
||
|
|
for(; i<s->maxiter; i++){
|
||
|
|
zr= s->zyklus[i][0];
|
||
|
|
zi= s->zyklus[i][1];
|
||
|
|
if(zr*zr + zi*zi > s->bailout){
|
||
|
|
switch(s->outer){
|
||
|
|
case ITERATION_COUNT:
|
||
|
|
zr = i;
|
||
|
|
c = lrintf((sinf(zr)+1)*127) + lrintf((sinf(zr/1.234)+1)*127)*256*256 + lrintf((sinf(zr/100)+1)*127)*256;
|
||
|
|
break;
|
||
|
|
case NORMALIZED_ITERATION_COUNT:
|
||
|
|
zr = i + log2(log(s->bailout) / log(zr*zr + zi*zi));
|
||
|
|
c = lrintf((sinf(zr)+1)*127) + lrintf((sinf(zr/1.234)+1)*127)*256*256 + lrintf((sinf(zr/100)+1)*127)*256;
|
||
|
|
break;
|
||
|
|
case WHITE:
|
||
|
|
c = 0xFFFFFF;
|
||
|
|
break;
|
||
|
|
case OUTZ:
|
||
|
|
zr /= s->bailout;
|
||
|
|
zi /= s->bailout;
|
||
|
|
c = (((int)(zr*128+128))&0xFF)*256 + (((int)(zi*128+128))&0xFF);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if(!c){
|
||
|
|
if(s->inner==PERIOD){
|
||
|
|
int j;
|
||
|
|
for(j=i-1; j; j--)
|
||
|
|
if(SQR(s->zyklus[j][0]-zr) + SQR(s->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(s->inner==CONVTIME){
|
||
|
|
c= floor(i*255.0/s->maxiter+dv)*0x010101;
|
||
|
|
} else if(s->inner==MINCOL){
|
||
|
|
int j;
|
||
|
|
double closest=9999;
|
||
|
|
int closest_index=0;
|
||
|
|
for(j=i-1; j>=0; j--)
|
||
|
|
if(SQR(s->zyklus[j][0]) + SQR(s->zyklus[j][1]) < closest){
|
||
|
|
closest= SQR(s->zyklus[j][0]) + SQR(s->zyklus[j][1]);
|
||
|
|
closest_index= j;
|
||
|
|
}
|
||
|
|
closest = sqrt(closest);
|
||
|
|
c= lrintf((s->zyklus[closest_index][0]/closest+1)*127+dv) + lrintf((s->zyklus[closest_index][1]/closest+1)*127+dv)*256;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
c |= 0xFF000000;
|
||
|
|
color[x + y*linesize]= c;
|
||
|
|
if(next_cidx < s->cache_allocated){
|
||
|
|
s->next_cache[next_cidx ].p[0]= cr;
|
||
|
|
s->next_cache[next_cidx ].p[1]= ci;
|
||
|
|
s->next_cache[next_cidx++].val = c;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci + scale/2, scale);
|
||
|
|
}
|
||
|
|
FFSWAP(void*, s->next_cache, s->point_cache);
|
||
|
|
s->cache_used = next_cidx;
|
||
|
|
if(s->cache_used == s->cache_allocated)
|
||
|
|
av_log(ctx, AV_LOG_INFO, "Mandelbrot cache is too small!\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
static int request_frame(AVFilterLink *link)
|
||
|
|
{
|
||
|
|
MBContext *s = link->src->priv;
|
||
|
|
AVFrame *picref = ff_get_video_buffer(link, s->w, s->h);
|
||
|
|
if (!picref)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
picref->sample_aspect_ratio = (AVRational) {1, 1};
|
||
|
|
picref->pts = s->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,
|
||
|
|
};
|