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FFmpeg/libavfilter/vsrc_mandelbrot.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

429 lines
16 KiB
C

/*
* 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 fractal 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 MBContext {
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;
int outer;
int 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"}, 0, 0, FLAGS },
{"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
{"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
{"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_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 *s = ctx->priv;
s->bailout *= s->bailout;
s->start_scale /=s->h;
s->end_scale /=s->h;
s->cache_allocated = s->w * s->h * 3;
s->cache_used = 0;
s->point_cache= av_malloc_array(s->cache_allocated, sizeof(*s->point_cache));
s-> next_cache= av_malloc_array(s->cache_allocated, sizeof(*s-> next_cache));
s-> zyklus = av_malloc_array(s->maxiter + 16, sizeof(*s->zyklus));
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
MBContext *s = ctx->priv;
av_freep(&s->point_cache);
av_freep(&s-> next_cache);
av_freep(&s->zyklus);
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_0BGR32,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int config_props(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->src;
MBContext *s = ctx->priv;
if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
return AVERROR(EINVAL);
inlink->w = s->w;
inlink->h = s->h;
inlink->time_base = av_inv_q(s->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 *s = ctx->priv;
if(s->morphamp)
return;
for(; *in_cidx < s->cache_used; (*in_cidx)++){
Point *p= &s->point_cache[*in_cidx];
int x;
if(p->p[1] > py)
break;
x= lrint((p->p[0] - s->start_x) / scale + s->w/2);
if(x<0 || x >= s->w)
continue;
if(color) color[x] = p->val;
if(out_cidx && *out_cidx < s->cache_allocated)
s->next_cache[(*out_cidx)++]= *p;
}
}
static int interpol(MBContext *s, 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==s->w || y+1==s->h)
return 0;
dist= FFMAX(FFABS(x-(s->w>>1))*s->h, FFABS(y-(s->h>>1))*s->w);
if(dist<(s->w*s->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 *s = ctx->priv;
int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx;
double scale= s->start_scale*pow(s->end_scale/s->start_scale, pts/s->end_pts);
int use_zyklus=0;
fill_from_cache(ctx, NULL, &in_cidx, NULL, s->start_y+scale*(-s->h/2-0.5), scale);
tmp_cidx= in_cidx;
memset(color, 0, sizeof(*color)*s->w);
for(y=0; y<s->h; y++){
int y1= y+1;
const double ci=s->start_y+scale*(y-s->h/2);
fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci, scale);
if(y1<s->h){
memset(color+linesize*y1, 0, sizeof(*color)*s->w);
fill_from_cache(ctx, color+linesize*y1, &tmp_cidx, NULL, ci + 3*scale/2, scale);
}
for(x=0; x<s->w; x++){
float av_uninit(epsilon);
const double cr=s->start_x+scale*(x-s->w/2);
double zr=cr;
double zi=ci;
uint32_t c=0;
double dv= s->dither / (double)(1LL<<32);
s->dither= s->dither*1664525+1013904223;
if(color[x + y*linesize] & 0xFF000000)
continue;
if(!s->morphamp){
if(interpol(s, color, x, y, linesize)){
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 = color[x + y*linesize];
}
continue;
}
}else{
zr += cos(pts * s->morphxf) * s->morphamp;
zi += sin(pts * s->morphyf) * s->morphamp;
}
use_zyklus= (x==0 || s->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);
if(use_zyklus)
epsilon= scale*(abs(x-s->w/2) + abs(y-s->h/2))/s->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(s->zyklus[i>>1][0]-outr)+fabs(s->zyklus[i>>1][1]-outi) <= epsilon)\
break;\
}\
s->zyklus[i][0]= outr;\
s->zyklus[i][1]= outi;\
for(i=0; i<s->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 > 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,
},
};
const 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,
.inputs = NULL,
FILTER_OUTPUTS(mandelbrot_outputs),
FILTER_QUERY_FUNC(query_formats),
};