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FFmpeg/libavfilter/vsrc_mandelbrot.c
Stefano Sabatini 4d6a8a2bdb lavfi: add avfilter_default_filter_name() 
The function is modelled after av_default_item_name(), and will print the
name of the instance filter if defined, otherwise the name of the filter.

This allows to show the instance name in the log, which is useful when
debugging complex filter graphs.
2012-06-04 00:54:57 +02:00

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/*
* 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 *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(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, CHAR_MIN, CHAR_MAX },
{"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.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 AVClass mandelbrot_class = {
"MBContext",
avfilter_default_filter_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;
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->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}},
};
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