falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41654 Commits
32 Branches
552MB
Tree: eaf655384b
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'eaf655384b'
${ noResults }
FFmpeg/libavfilter/vsrc_mandelbrot.c

422 lines
15KB
Raw Blame History 

  1. /*

  2.  * Copyright (c) 2011 Michael Niedermayer

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  *

  20.  * The vsrc_color filter from Stefano Sabatini was used as template to create

  21.  * this

  22.  */

  23. 

  24. /**

  25.  * @file

  26.  * Mandelbrot fraktal renderer

  27.  */

  28. 

  29. #include "avfilter.h"

  30. #include "formats.h"

  31. #include "video.h"

  32. #include "libavutil/imgutils.h"

  33. #include "libavutil/opt.h"

  34. #include "libavutil/parseutils.h"

  35. #include <float.h>

  36. #include <math.h>

  37. 

  38. #define SQR(a) ((a)*(a))

  39. 

  40. enum Outer{

  41.     ITERATION_COUNT,

  42.     NORMALIZED_ITERATION_COUNT,

  43. };

  44. 

  45. enum Inner{

  46.     BLACK,

  47.     PERIOD,

  48.     CONVTIME,

  49.     MINCOL,

  50. };

  51. 

  52. typedef struct Point {

  53.     double p[2];

  54.     uint32_t val;

  55. } Point;

  56. 

  57. typedef struct {

  58.     const AVClass *class;

  59.     int w, h;

  60.     AVRational time_base;

  61.     uint64_t pts;

  62.     char *rate;

  63.     int maxiter;

  64.     double start_x;

  65.     double start_y;

  66.     double start_scale;

  67.     double end_scale;

  68.     double end_pts;

  69.     double bailout;

  70.     enum Outer outer;

  71.     enum Inner inner;

  72.     int cache_allocated;

  73.     int cache_used;

  74.     Point *point_cache;

  75.     Point *next_cache;

  76.     double (*zyklus)[2];

  77.     uint32_t dither;

  78. } MBContext;

  79. 

  80. #define OFFSET(x) offsetof(MBContext, x)

  81. 

  82. static const AVOption mandelbrot_options[] = {

  83.     {"size",        "set frame size",                OFFSET(w),       AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"},  CHAR_MIN, CHAR_MAX },

  84.     {"s",           "set frame size",                OFFSET(w),       AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"},  CHAR_MIN, CHAR_MAX },

  85.     {"rate",        "set frame rate",                OFFSET(rate),    AV_OPT_TYPE_STRING,     {.str="25"},  CHAR_MIN, CHAR_MAX },

  86.     {"r",           "set frame rate",                OFFSET(rate),    AV_OPT_TYPE_STRING,     {.str="25"},  CHAR_MIN, CHAR_MAX },

  87.     {"maxiter",     "set max iterations number",     OFFSET(maxiter), AV_OPT_TYPE_INT,        {.dbl=7189},  1,        INT_MAX  },

  88.     {"start_x",     "set the initial x position",    OFFSET(start_x), AV_OPT_TYPE_DOUBLE,     {.dbl=-0.743643887037158704752191506114774}, -100, 100  },

  89.     {"start_y",     "set the initial y position",    OFFSET(start_y), AV_OPT_TYPE_DOUBLE,     {.dbl=-0.131825904205311970493132056385139}, -100, 100  },

  90.     {"start_scale", "set the initial scale value",   OFFSET(start_scale), AV_OPT_TYPE_DOUBLE, {.dbl=3.0},  0, FLT_MAX },

  91.     {"end_scale",   "set the terminal scale value",  OFFSET(end_scale), AV_OPT_TYPE_DOUBLE,   {.dbl=0.3},  0, FLT_MAX },

  92.     {"end_pts",     "set the terminal pts value",    OFFSET(end_pts), AV_OPT_TYPE_DOUBLE,     {.dbl=400},  0, INT64_MAX },

  93.     {"bailout",     "set the bailout value",         OFFSET(bailout), AV_OPT_TYPE_DOUBLE,     {.dbl=10},   0, FLT_MAX },

  94. 

  95.     {"outer",       "set outer coloring mode",       OFFSET(outer), AV_OPT_TYPE_INT, {.dbl=NORMALIZED_ITERATION_COUNT}, 0, INT_MAX, 0, "outer"},

  96.     {"iteration_count", "set iteration count mode",  0, AV_OPT_TYPE_CONST, {.dbl=ITERATION_COUNT}, INT_MIN, INT_MAX, 0, "outer" },

  97.     {"normalized_iteration_count", "set normalized iteration count mode",   0, AV_OPT_TYPE_CONST, {.dbl=NORMALIZED_ITERATION_COUNT}, INT_MIN, INT_MAX, 0, "outer" },

  98. 

  99.     {"inner",       "set inner coloring mode",       OFFSET(inner), AV_OPT_TYPE_INT, {.dbl=MINCOL}, 0, INT_MAX, 0, "inner"},

  100.     {"black",       "set black mode",                0, AV_OPT_TYPE_CONST, {.dbl=BLACK}, INT_MIN, INT_MAX, 0, "inner" },

  101.     {"period",      "set period mode",               0, AV_OPT_TYPE_CONST, {.dbl=PERIOD}, INT_MIN, INT_MAX, 0, "inner" },

  102.     {"convergence", "show time until convergence",   0, AV_OPT_TYPE_CONST, {.dbl=CONVTIME}, INT_MIN, INT_MAX, 0, "inner" },

  103.     {"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" },

  104. 

  105.     {NULL},

  106. };

  107. 

  108. static const AVClass mandelbrot_class = {

  109.     "MBContext",

  110.     av_default_item_name,

  111.     mandelbrot_options

  112. };

  113. 

  114. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

  115. {

  116.     MBContext *mb = ctx->priv;

  117.     AVRational rate_q;

  118.     int err;

  119. 

  120.     mb->class = &mandelbrot_class;

  121.     av_opt_set_defaults(mb);

  122. 

  123.     if ((err = (av_set_options_string(mb, args, "=", ":"))) < 0) {

  124.         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);

  125.         return err;

  126.     }

  127.     mb->bailout *= mb->bailout;

  128. 

  129.     mb->start_scale /=mb->h;

  130.     mb->end_scale /=mb->h;

  131. 

  132.     if (av_parse_video_rate(&rate_q, mb->rate) < 0 ||

  133.         rate_q.den <= 0 || rate_q.num <= 0) {

  134.         av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", mb->rate);

  135.         return AVERROR(EINVAL);

  136.     }

  137.     mb->time_base.num = rate_q.den;

  138.     mb->time_base.den = rate_q.num;

  139. 

  140.     mb->cache_allocated = mb->w * mb->h * 3;

  141.     mb->cache_used = 0;

  142.     mb->point_cache= av_malloc(sizeof(*mb->point_cache)*mb->cache_allocated);

  143.     mb-> next_cache= av_malloc(sizeof(*mb-> next_cache)*mb->cache_allocated);

  144.     mb-> zyklus    = av_malloc(sizeof(*mb->zyklus) * (mb->maxiter+16));

  145. 

  146.     return 0;

  147. }

  148. 

  149. static av_cold void uninit(AVFilterContext *ctx)

  150. {

  151.     MBContext *mb = ctx->priv;

  152. 

  153.     av_freep(&mb->rate);

  154.     av_freep(&mb->point_cache);

  155.     av_freep(&mb-> next_cache);

  156.     av_freep(&mb->zyklus);

  157. }

  158. 

  159. static int query_formats(AVFilterContext *ctx)

  160. {

  161.     static const enum PixelFormat pix_fmts[] = {

  162.         PIX_FMT_BGR32,

  163.         PIX_FMT_NONE

  164.     };

  165. 

  166.     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

  167.     return 0;

  168. }

  169. 

  170. static int config_props(AVFilterLink *inlink)

  171. {

  172.     AVFilterContext *ctx = inlink->src;

  173.     MBContext *mb = ctx->priv;

  174. 

  175.     if (av_image_check_size(mb->w, mb->h, 0, ctx) < 0)

  176.         return AVERROR(EINVAL);

  177. 

  178.     inlink->w = mb->w;

  179.     inlink->h = mb->h;

  180.     inlink->time_base = mb->time_base;

  181. 

  182.     return 0;

  183. }

  184. 

  185. static void fill_from_cache(AVFilterContext *ctx, uint32_t *color, int *in_cidx, int *out_cidx, double py, double scale){

  186.     MBContext *mb = ctx->priv;

  187.     for(; *in_cidx < mb->cache_used; (*in_cidx)++){

  188.         Point *p= &mb->point_cache[*in_cidx];

  189.         int x;

  190.         if(p->p[1] > py)

  191.             break;

  192.         x= round((p->p[0] - mb->start_x) / scale + mb->w/2);

  193.         if(x<0 || x >= mb->w)

  194.             continue;

  195.         if(color) color[x] = p->val;

  196.         if(out_cidx && *out_cidx < mb->cache_allocated)

  197.             mb->next_cache[(*out_cidx)++]= *p;

  198.     }

  199. }

  200. 

  201. static int interpol(MBContext *mb, uint32_t *color, int x, int y, int linesize)

  202. {

  203.     uint32_t a,b,c,d, i;

  204.     uint32_t ipol=0xFF000000;

  205.     int dist;

  206. 

  207.     if(!x || !y || x+1==mb->w || y+1==mb->h)

  208.         return 0;

  209. 

  210.     dist= FFMAX(FFABS(x-(mb->w>>1))*mb->h, FFABS(y-(mb->h>>1))*mb->w);

  211. 

  212.     if(dist<(mb->w*mb->h>>3))

  213.         return 0;

  214. 

  215.     a=color[(x+1) + (y+0)*linesize];

  216.     b=color[(x-1) + (y+1)*linesize];

  217.     c=color[(x+0) + (y+1)*linesize];

  218.     d=color[(x+1) + (y+1)*linesize];

  219. 

  220.     if(a&&c){

  221.         b= color[(x-1) + (y+0)*linesize];

  222.         d= color[(x+0) + (y-1)*linesize];

  223.     }else if(b&&d){

  224.         a= color[(x+1) + (y-1)*linesize];

  225.         c= color[(x-1) + (y-1)*linesize];

  226.     }else if(c){

  227.         d= color[(x+0) + (y-1)*linesize];

  228.         a= color[(x-1) + (y+0)*linesize];

  229.         b= color[(x+1) + (y-1)*linesize];

  230.     }else if(d){

  231.         c= color[(x-1) + (y-1)*linesize];

  232.         a= color[(x-1) + (y+0)*linesize];

  233.         b= color[(x+1) + (y-1)*linesize];

  234.     }else

  235.         return 0;

  236. 

  237.     for(i=0; i<3; i++){

  238.         int s= 8*i;

  239.         uint8_t ac= a>>s;

  240.         uint8_t bc= b>>s;

  241.         uint8_t cc= c>>s;

  242.         uint8_t dc= d>>s;

  243.         int ipolab= (ac + bc);

  244.         int ipolcd= (cc + dc);

  245.         if(FFABS(ipolab - ipolcd) > 5)

  246.             return 0;

  247.         if(FFABS(ac-bc)+FFABS(cc-dc) > 20)

  248.             return 0;

  249.         ipol |= ((ipolab + ipolcd + 2)/4)<<s;

  250.     }

  251.     color[x + y*linesize]= ipol;

  252.     return 1;

  253. }

  254. 

  255. static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, int64_t pts)

  256. {

  257.     MBContext *mb = ctx->priv;

  258.     int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx;

  259.     double scale= mb->start_scale*pow(mb->end_scale/mb->start_scale, pts/mb->end_pts);

  260.     int use_zyklus=0;

  261.     fill_from_cache(ctx, NULL, &in_cidx, NULL, mb->start_y+scale*(-mb->h/2-0.5), scale);

  262.     tmp_cidx= in_cidx;

  263.     memset(color, 0, sizeof(*color)*mb->w);

  264.     for(y=0; y<mb->h; y++){

  265.         int y1= y+1;

  266.         const double ci=mb->start_y+scale*(y-mb->h/2);

  267.         fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci, scale);

  268.         if(y1<mb->h){

  269.             memset(color+linesize*y1, 0, sizeof(*color)*mb->w);

  270.             fill_from_cache(ctx, color+linesize*y1, &tmp_cidx, NULL, ci + 3*scale/2, scale);

  271.         }

  272. 

  273.         for(x=0; x<mb->w; x++){

  274.             float av_uninit(epsilon);

  275.             const double cr=mb->start_x+scale*(x-mb->w/2);

  276.             double zr=cr;

  277.             double zi=ci;

  278.             uint32_t c=0;

  279.             double dv= mb->dither / (double)(1LL<<32);

  280.             mb->dither= mb->dither*1664525+1013904223;

  281. 

  282.             if(color[x + y*linesize] & 0xFF000000)

  283.                 continue;

  284.             if(interpol(mb, color, x, y, linesize)){

  285.                 if(next_cidx < mb->cache_allocated){

  286.                     mb->next_cache[next_cidx  ].p[0]= cr;

  287.                     mb->next_cache[next_cidx  ].p[1]= ci;

  288.                     mb->next_cache[next_cidx++].val = color[x + y*linesize];

  289.                 }

  290.                 continue;

  291.             }

  292. 

  293.             use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);

  294.             if(use_zyklus)

  295.                 epsilon= scale*1*sqrt(SQR(x-mb->w/2) + SQR(y-mb->h/2))/mb->w;

  296. 

  297. #define Z_Z2_C(outr,outi,inr,ini)\

  298.             outr= inr*inr - ini*ini + cr;\

  299.             outi= 2*inr*ini + ci;

  300. 

  301. #define Z_Z2_C_ZYKLUS(outr,outi,inr,ini, Z)\

  302.             Z_Z2_C(outr,outi,inr,ini)\

  303.             if(use_zyklus){\

  304.                 if(Z && fabs(mb->zyklus[i>>1][0]-outr)+fabs(mb->zyklus[i>>1][1]-outi) <= epsilon)\

  305.                     break;\

  306.             }\

  307.             mb->zyklus[i][0]= outr;\

  308.             mb->zyklus[i][1]= outi;\

  309. 

  310. 

  311. 

  312.             for(i=0; i<mb->maxiter-8; i++){

  313.                 double t;

  314.                 Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)

  315.                 i++;

  316.                 Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)

  317.                 i++;

  318.                 Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)

  319.                 i++;

  320.                 Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)

  321.                 i++;

  322.                 Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)

  323.                 i++;

  324.                 Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)

  325.                 i++;

  326.                 Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0)

  327.                 i++;

  328.                 Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1)

  329.                 if(zr*zr + zi*zi > mb->bailout){

  330.                     i-= FFMIN(7, i);

  331.                     for(; i<mb->maxiter; i++){

  332.                         zr= mb->zyklus[i][0];

  333.                         zi= mb->zyklus[i][1];

  334.                         if(zr*zr + zi*zi > mb->bailout){

  335.                             switch(mb->outer){

  336.                             case            ITERATION_COUNT: zr = i; break;

  337.                             case NORMALIZED_ITERATION_COUNT: zr= i + log2(log(mb->bailout) / log(zr*zr + zi*zi)); break;

  338.                             }

  339.                             c= lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256;

  340.                             break;

  341.                         }

  342.                     }

  343.                     break;

  344.                 }

  345.             }

  346.             if(!c){

  347.                 if(mb->inner==PERIOD){

  348.                 int j;

  349.                 for(j=i-1; j; j--)

  350.                     if(SQR(mb->zyklus[j][0]-zr) + SQR(mb->zyklus[j][1]-zi) < epsilon*epsilon*10)

  351.                         break;

  352.                 if(j){

  353.                     c= i-j;

  354.                     c= ((c<<5)&0xE0) + ((c<<16)&0xE000) + ((c<<27)&0xE00000);

  355.                 }

  356.                 }else if(mb->inner==CONVTIME){

  357.                     c= floor(i*255.0/mb->maxiter+dv)*0x010101;

  358.                 } else if(mb->inner==MINCOL){

  359.                     int j;

  360.                     double closest=9999;

  361.                     int closest_index=0;

  362.                     for(j=i-1; j>=0; j--)

  363.                         if(SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]) < closest){

  364.                             closest= SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]);

  365.                             closest_index= j;

  366.                         }

  367.                     closest = sqrt(closest);

  368.                     c= lrintf((mb->zyklus[closest_index][0]/closest+1)*127+dv) + lrintf((mb->zyklus[closest_index][1]/closest+1)*127+dv)*256;

  369.                 }

  370.             }

  371.             c |= 0xFF000000;

  372.             color[x + y*linesize]= c;

  373.             if(next_cidx < mb->cache_allocated){

  374.                 mb->next_cache[next_cidx  ].p[0]= cr;

  375.                 mb->next_cache[next_cidx  ].p[1]= ci;

  376.                 mb->next_cache[next_cidx++].val = c;

  377.             }

  378.         }

  379.         fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci + scale/2, scale);

  380.     }

  381.     FFSWAP(void*, mb->next_cache, mb->point_cache);

  382.     mb->cache_used = next_cidx;

  383.     if(mb->cache_used == mb->cache_allocated)

  384.         av_log(0, AV_LOG_INFO, "Mandelbrot cache is too small!\n");

  385. }

  386. 

  387. static int request_frame(AVFilterLink *link)

  388. {

  389.     MBContext *mb = link->src->priv;

  390.     AVFilterBufferRef *picref = ff_get_video_buffer(link, AV_PERM_WRITE, mb->w, mb->h);

  391.     picref->video->sample_aspect_ratio = (AVRational) {1, 1};

  392.     picref->pts = mb->pts++;

  393.     picref->pos = -1;

  394. 

  395.     ff_start_frame(link, avfilter_ref_buffer(picref, ~0));

  396.     draw_mandelbrot(link->src, (uint32_t*)picref->data[0], picref->linesize[0]/4, picref->pts);

  397.     ff_draw_slice(link, 0, mb->h, 1);

  398.     ff_end_frame(link);

  399.     avfilter_unref_buffer(picref);

  400. 

  401.     return 0;

  402. }

  403. 

  404. AVFilter avfilter_vsrc_mandelbrot = {

  405.     .name        = "mandelbrot",

  406.     .description = NULL_IF_CONFIG_SMALL("Render a Mandelbrot fractal."),

  407. 

  408.     .priv_size = sizeof(MBContext),

  409.     .init      = init,

  410.     .uninit    = uninit,

  411. 

  412.     .query_formats = query_formats,

  413. 

  414.     .inputs    = (const AVFilterPad[]) {{ .name = NULL}},

  415. 

  416.     .outputs   = (const AVFilterPad[]) {{ .name      = "default",

  417.                                     .type            = AVMEDIA_TYPE_VIDEO,

  418.                                     .request_frame   = request_frame,

  419.                                     .config_props    = config_props },

  420.                                   { .name = NULL}},

  421. };