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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2011 Michael Niedermayer |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | * |
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| 20 | * The vsrc_color filter from Stefano Sabatini was used as template to create |
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| 21 | * this |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * @file |
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| 26 | * Mandelbrot fraktal renderer |
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| 27 | */ |
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| 28 | |||
| 29 | #include "avfilter.h" |
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| 30 | #include "formats.h" |
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| 31 | #include "video.h" |
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| 32 | #include "internal.h" |
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| 33 | #include "libavutil/imgutils.h" |
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| 34 | #include "libavutil/opt.h" |
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| 35 | #include "libavutil/parseutils.h" |
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| 36 | #include |
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| 37 | #include |
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| 38 | |||
| 39 | #define SQR(a) ((a)*(a)) |
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| 40 | |||
| 41 | enum Outer{ |
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| 42 | ITERATION_COUNT, |
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| 43 | NORMALIZED_ITERATION_COUNT, |
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| 44 | WHITE, |
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| 45 | OUTZ, |
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| 46 | }; |
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| 47 | |||
| 48 | enum Inner{ |
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| 49 | BLACK, |
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| 50 | PERIOD, |
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| 51 | CONVTIME, |
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| 52 | MINCOL, |
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| 53 | }; |
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| 54 | |||
| 55 | typedef struct Point { |
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| 56 | double p[2]; |
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| 57 | uint32_t val; |
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| 58 | } Point; |
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| 59 | |||
| 60 | typedef struct { |
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| 61 | const AVClass *class; |
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| 62 | int w, h; |
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| 63 | AVRational frame_rate; |
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| 64 | uint64_t pts; |
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| 65 | int maxiter; |
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| 66 | double start_x; |
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| 67 | double start_y; |
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| 68 | double start_scale; |
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| 69 | double end_scale; |
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| 70 | double end_pts; |
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| 71 | double bailout; |
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| 72 | enum Outer outer; |
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| 73 | enum Inner inner; |
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| 74 | int cache_allocated; |
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| 75 | int cache_used; |
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| 76 | Point *point_cache; |
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| 77 | Point *next_cache; |
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| 78 | double (*zyklus)[2]; |
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| 79 | uint32_t dither; |
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| 80 | |||
| 81 | double morphxf; |
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| 82 | double morphyf; |
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| 83 | double morphamp; |
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| 84 | } MBContext; |
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| 85 | |||
| 86 | #define OFFSET(x) offsetof(MBContext, x) |
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| 87 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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| 88 | |||
| 89 | static const AVOption mandelbrot_options[] = { |
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| 90 | {"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
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| 91 | {"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
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| 92 | {"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
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| 93 | {"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
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| 94 | {"maxiter", "set max iterations number", OFFSET(maxiter), AV_OPT_TYPE_INT, {.i64=7189}, 1, INT_MAX, FLAGS }, |
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| 95 | {"start_x", "set the initial x position", OFFSET(start_x), AV_OPT_TYPE_DOUBLE, {.dbl=-0.743643887037158704752191506114774}, -100, 100, FLAGS }, |
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| 96 | {"start_y", "set the initial y position", OFFSET(start_y), AV_OPT_TYPE_DOUBLE, {.dbl=-0.131825904205311970493132056385139}, -100, 100, FLAGS }, |
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| 97 | {"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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| 98 | {"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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| 99 | {"end_pts", "set the terminal pts value", OFFSET(end_pts), AV_OPT_TYPE_DOUBLE, {.dbl=400}, 0, INT64_MAX, FLAGS }, |
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| 100 | {"bailout", "set the bailout value", OFFSET(bailout), AV_OPT_TYPE_DOUBLE, {.dbl=10}, 0, FLT_MAX, FLAGS }, |
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| 101 | {"morphxf", "set morph x frequency", OFFSET(morphxf), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, -FLT_MAX, FLT_MAX, FLAGS }, |
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| 102 | {"morphyf", "set morph y frequency", OFFSET(morphyf), AV_OPT_TYPE_DOUBLE, {.dbl=0.0123}, -FLT_MAX, FLT_MAX, FLAGS }, |
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| 103 | {"morphamp", "set morph amplitude", OFFSET(morphamp), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS }, |
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| 104 | |||
| 105 | {"outer", "set outer coloring mode", OFFSET(outer), AV_OPT_TYPE_INT, {.i64=NORMALIZED_ITERATION_COUNT}, 0, INT_MAX, FLAGS, "outer" }, |
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| 106 | {"iteration_count", "set iteration count mode", 0, AV_OPT_TYPE_CONST, {.i64=ITERATION_COUNT}, INT_MIN, INT_MAX, FLAGS, "outer" }, |
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| 107 | {"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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| 108 | {"white", "set white mode", 0, AV_OPT_TYPE_CONST, {.i64=WHITE}, INT_MIN, INT_MAX, FLAGS, "outer" }, |
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| 109 | {"outz", "set outz mode", 0, AV_OPT_TYPE_CONST, {.i64=OUTZ}, INT_MIN, INT_MAX, FLAGS, "outer" }, |
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| 110 | |||
| 111 | {"inner", "set inner coloring mode", OFFSET(inner), AV_OPT_TYPE_INT, {.i64=MINCOL}, 0, INT_MAX, FLAGS, "inner" }, |
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| 112 | {"black", "set black mode", 0, AV_OPT_TYPE_CONST, {.i64=BLACK}, INT_MIN, INT_MAX, FLAGS, "inner"}, |
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| 113 | {"period", "set period mode", 0, AV_OPT_TYPE_CONST, {.i64=PERIOD}, INT_MIN, INT_MAX, FLAGS, "inner"}, |
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| 114 | {"convergence", "show time until convergence", 0, AV_OPT_TYPE_CONST, {.i64=CONVTIME}, INT_MIN, INT_MAX, FLAGS, "inner"}, |
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| 115 | {"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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| 116 | |||
| 117 | {NULL}, |
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| 118 | }; |
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| 119 | |||
| 120 | AVFILTER_DEFINE_CLASS(mandelbrot); |
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| 121 | |||
| 122 | static av_cold int init(AVFilterContext *ctx) |
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| 123 | { |
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| 124 | MBContext *mb = ctx->priv; |
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| 125 | |||
| 126 | mb->bailout *= mb->bailout; |
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| 127 | |||
| 128 | mb->start_scale /=mb->h; |
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| 129 | mb->end_scale /=mb->h; |
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| 130 | |||
| 131 | mb->cache_allocated = mb->w * mb->h * 3; |
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| 132 | mb->cache_used = 0; |
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| 133 | mb->point_cache= av_malloc(sizeof(*mb->point_cache)*mb->cache_allocated); |
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| 134 | mb-> next_cache= av_malloc(sizeof(*mb-> next_cache)*mb->cache_allocated); |
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| 135 | mb-> zyklus = av_malloc(sizeof(*mb->zyklus) * (mb->maxiter+16)); |
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| 136 | |||
| 137 | return 0; |
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| 138 | } |
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| 139 | |||
| 140 | static av_cold void uninit(AVFilterContext *ctx) |
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| 141 | { |
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| 142 | MBContext *mb = ctx->priv; |
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| 143 | |||
| 144 | av_freep(&mb->point_cache); |
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| 145 | av_freep(&mb-> next_cache); |
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| 146 | av_freep(&mb->zyklus); |
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| 147 | } |
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| 148 | |||
| 149 | static int query_formats(AVFilterContext *ctx) |
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| 150 | { |
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| 151 | static const enum AVPixelFormat pix_fmts[] = { |
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| 152 | AV_PIX_FMT_BGR32, |
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| 153 | AV_PIX_FMT_NONE |
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| 154 | }; |
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| 155 | |||
| 156 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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| 157 | return 0; |
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| 158 | } |
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| 159 | |||
| 160 | static int config_props(AVFilterLink *inlink) |
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| 161 | { |
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| 162 | AVFilterContext *ctx = inlink->src; |
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| 163 | MBContext *mb = ctx->priv; |
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| 164 | |||
| 165 | if (av_image_check_size(mb->w, mb->h, 0, ctx) < 0) |
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| 166 | return AVERROR(EINVAL); |
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| 167 | |||
| 168 | inlink->w = mb->w; |
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| 169 | inlink->h = mb->h; |
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| 170 | inlink->time_base = av_inv_q(mb->frame_rate); |
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| 171 | |||
| 172 | return 0; |
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| 173 | } |
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| 174 | |||
| 175 | static void fill_from_cache(AVFilterContext *ctx, uint32_t *color, int *in_cidx, int *out_cidx, double py, double scale){ |
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| 176 | MBContext *mb = ctx->priv; |
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| 177 | if(mb->morphamp) |
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| 178 | return; |
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| 179 | for(; *in_cidx < mb->cache_used; (*in_cidx)++){ |
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| 180 | Point *p= &mb->point_cache[*in_cidx]; |
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| 181 | int x; |
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| 182 | if(p->p[1] > py) |
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| 183 | break; |
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| 184 | x= round((p->p[0] - mb->start_x) / scale + mb->w/2); |
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| 185 | if(x<0 || x >= mb->w) |
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| 186 | continue; |
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| 187 | if(color) color[x] = p->val; |
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| 188 | if(out_cidx && *out_cidx < mb->cache_allocated) |
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| 189 | mb->next_cache[(*out_cidx)++]= *p; |
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| 190 | } |
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| 191 | } |
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| 192 | |||
| 193 | static int interpol(MBContext *mb, uint32_t *color, int x, int y, int linesize) |
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| 194 | { |
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| 195 | uint32_t a,b,c,d, i; |
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| 196 | uint32_t ipol=0xFF000000; |
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| 197 | int dist; |
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| 198 | |||
| 199 | if(!x || !y || x+1==mb->w || y+1==mb->h) |
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| 200 | return 0; |
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| 201 | |||
| 202 | dist= FFMAX(FFABS(x-(mb->w>>1))*mb->h, FFABS(y-(mb->h>>1))*mb->w); |
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| 203 | |||
| 204 | if(dist<(mb->w*mb->h>>3)) |
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| 205 | return 0; |
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| 206 | |||
| 207 | a=color[(x+1) + (y+0)*linesize]; |
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| 208 | b=color[(x-1) + (y+1)*linesize]; |
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| 209 | c=color[(x+0) + (y+1)*linesize]; |
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| 210 | d=color[(x+1) + (y+1)*linesize]; |
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| 211 | |||
| 212 | if(a&&c){ |
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| 213 | b= color[(x-1) + (y+0)*linesize]; |
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| 214 | d= color[(x+0) + (y-1)*linesize]; |
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| 215 | }else if(b&&d){ |
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| 216 | a= color[(x+1) + (y-1)*linesize]; |
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| 217 | c= color[(x-1) + (y-1)*linesize]; |
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| 218 | }else if(c){ |
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| 219 | d= color[(x+0) + (y-1)*linesize]; |
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| 220 | a= color[(x-1) + (y+0)*linesize]; |
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| 221 | b= color[(x+1) + (y-1)*linesize]; |
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| 222 | }else if(d){ |
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| 223 | c= color[(x-1) + (y-1)*linesize]; |
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| 224 | a= color[(x-1) + (y+0)*linesize]; |
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| 225 | b= color[(x+1) + (y-1)*linesize]; |
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| 226 | }else |
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| 227 | return 0; |
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| 228 | |||
| 229 | for(i=0; i<3; i++){ |
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| 230 | int s= 8*i; |
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| 231 | uint8_t ac= a>>s; |
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| 232 | uint8_t bc= b>>s; |
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| 233 | uint8_t cc= c>>s; |
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| 234 | uint8_t dc= d>>s; |
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| 235 | int ipolab= (ac + bc); |
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| 236 | int ipolcd= (cc + dc); |
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| 237 | if(FFABS(ipolab - ipolcd) > 5) |
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| 238 | return 0; |
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| 239 | if(FFABS(ac-bc)+FFABS(cc-dc) > 20) |
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| 240 | return 0; |
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| 241 | ipol |= ((ipolab + ipolcd + 2)/4)< |
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| 242 | } |
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| 243 | color[x + y*linesize]= ipol; |
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| 244 | return 1; |
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| 245 | } |
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| 246 | |||
| 247 | static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, int64_t pts) |
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| 248 | { |
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| 249 | MBContext *mb = ctx->priv; |
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| 250 | int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx; |
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| 251 | double scale= mb->start_scale*pow(mb->end_scale/mb->start_scale, pts/mb->end_pts); |
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| 252 | int use_zyklus=0; |
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| 253 | fill_from_cache(ctx, NULL, &in_cidx, NULL, mb->start_y+scale*(-mb->h/2-0.5), scale); |
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| 254 | tmp_cidx= in_cidx; |
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| 255 | memset(color, 0, sizeof(*color)*mb->w); |
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| 256 | for(y=0; y |
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| 257 | int y1= y+1; |
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| 258 | const double ci=mb->start_y+scale*(y-mb->h/2); |
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| 259 | fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci, scale); |
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| 260 | if(y1 |
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| 261 | memset(color+linesize*y1, 0, sizeof(*color)*mb->w); |
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| 262 | fill_from_cache(ctx, color+linesize*y1, &tmp_cidx, NULL, ci + 3*scale/2, scale); |
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| 263 | } |
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| 264 | |||
| 265 | for(x=0; x |
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| 266 | float av_uninit(epsilon); |
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| 267 | const double cr=mb->start_x+scale*(x-mb->w/2); |
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| 268 | double zr=cr; |
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| 269 | double zi=ci; |
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| 270 | uint32_t c=0; |
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| 271 | double dv= mb->dither / (double)(1LL<<32); |
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| 272 | mb->dither= mb->dither*1664525+1013904223; |
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| 273 | |||
| 274 | if(color[x + y*linesize] & 0xFF000000) |
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| 275 | continue; |
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| 276 | if(!mb->morphamp){ |
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| 277 | if(interpol(mb, color, x, y, linesize)){ |
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| 278 | if(next_cidx < mb->cache_allocated){ |
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| 279 | mb->next_cache[next_cidx ].p[0]= cr; |
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| 280 | mb->next_cache[next_cidx ].p[1]= ci; |
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| 281 | mb->next_cache[next_cidx++].val = color[x + y*linesize]; |
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| 282 | } |
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| 283 | continue; |
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| 284 | } |
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| 285 | }else{ |
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| 286 | zr += cos(pts * mb->morphxf) * mb->morphamp; |
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| 287 | zi += sin(pts * mb->morphyf) * mb->morphamp; |
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| 288 | } |
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| 289 | |||
| 290 | use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000); |
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| 291 | if(use_zyklus) |
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| 292 | epsilon= scale*1*sqrt(SQR(x-mb->w/2) + SQR(y-mb->h/2))/mb->w; |
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| 293 | |||
| 294 | #define Z_Z2_C(outr,outi,inr,ini)\ |
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| 295 | outr= inr*inr - ini*ini + cr;\ |
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| 296 | outi= 2*inr*ini + ci; |
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| 297 | |||
| 298 | #define Z_Z2_C_ZYKLUS(outr,outi,inr,ini, Z)\ |
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| 299 | Z_Z2_C(outr,outi,inr,ini)\ |
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| 300 | if(use_zyklus){\ |
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| 301 | if(Z && fabs(mb->zyklus[i>>1][0]-outr)+fabs(mb->zyklus[i>>1][1]-outi) <= epsilon)\ |
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| 302 | break;\ |
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| 303 | }\ |
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| 304 | mb->zyklus[i][0]= outr;\ |
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| 305 | mb->zyklus[i][1]= outi;\ |
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| 306 | |||
| 307 | |||
| 308 | |||
| 309 | for(i=0; i |
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| 310 | double t; |
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| 311 | Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
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| 312 | i++; |
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| 313 | Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
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| 314 | i++; |
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| 315 | Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
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| 316 | i++; |
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| 317 | Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
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| 318 | i++; |
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| 319 | Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
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| 320 | i++; |
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| 321 | Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
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| 322 | i++; |
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| 323 | Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) |
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| 324 | i++; |
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| 325 | Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) |
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| 326 | if(zr*zr + zi*zi > mb->bailout){ |
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| 327 | i-= FFMIN(7, i); |
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| 328 | for(; i |
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| 329 | zr= mb->zyklus[i][0]; |
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| 330 | zi= mb->zyklus[i][1]; |
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| 331 | if(zr*zr + zi*zi > mb->bailout){ |
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| 332 | switch(mb->outer){ |
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| 333 | case ITERATION_COUNT: |
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| 334 | zr = i; |
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| 335 | c = lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256; |
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| 336 | break; |
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| 337 | case NORMALIZED_ITERATION_COUNT: |
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| 338 | zr = i + log2(log(mb->bailout) / log(zr*zr + zi*zi)); |
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| 339 | c = lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256; |
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| 340 | break; |
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| 341 | case WHITE: |
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| 342 | c = 0xFFFFFF; |
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| 343 | break; |
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| 344 | case OUTZ: |
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| 345 | zr /= mb->bailout; |
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| 346 | zi /= mb->bailout; |
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| 347 | c = (((int)(zr*128+128))&0xFF)*256 + (((int)(zi*128+128))&0xFF); |
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| 348 | } |
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| 349 | break; |
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| 350 | } |
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| 351 | } |
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| 352 | break; |
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| 353 | } |
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| 354 | } |
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| 355 | if(!c){ |
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| 356 | if(mb->inner==PERIOD){ |
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| 357 | int j; |
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| 358 | for(j=i-1; j; j--) |
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| 359 | if(SQR(mb->zyklus[j][0]-zr) + SQR(mb->zyklus[j][1]-zi) < epsilon*epsilon*10) |
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| 360 | break; |
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| 361 | if(j){ |
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| 362 | c= i-j; |
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| 363 | c= ((c<<5)&0xE0) + ((c<<10)&0xE000) + ((c<<15)&0xE00000); |
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| 364 | } |
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| 365 | }else if(mb->inner==CONVTIME){ |
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| 366 | c= floor(i*255.0/mb->maxiter+dv)*0x010101; |
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| 367 | } else if(mb->inner==MINCOL){ |
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| 368 | int j; |
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| 369 | double closest=9999; |
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| 370 | int closest_index=0; |
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| 371 | for(j=i-1; j>=0; j--) |
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| 372 | if(SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]) < closest){ |
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| 373 | closest= SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]); |
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| 374 | closest_index= j; |
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| 375 | } |
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| 376 | closest = sqrt(closest); |
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| 377 | c= lrintf((mb->zyklus[closest_index][0]/closest+1)*127+dv) + lrintf((mb->zyklus[closest_index][1]/closest+1)*127+dv)*256; |
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| 378 | } |
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| 379 | } |
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| 380 | c |= 0xFF000000; |
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| 381 | color[x + y*linesize]= c; |
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| 382 | if(next_cidx < mb->cache_allocated){ |
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| 383 | mb->next_cache[next_cidx ].p[0]= cr; |
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| 384 | mb->next_cache[next_cidx ].p[1]= ci; |
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| 385 | mb->next_cache[next_cidx++].val = c; |
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| 386 | } |
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| 387 | } |
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| 388 | fill_from_cache(ctx, NULL, &in_cidx, &next_cidx, ci + scale/2, scale); |
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| 389 | } |
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| 390 | FFSWAP(void*, mb->next_cache, mb->point_cache); |
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| 391 | mb->cache_used = next_cidx; |
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| 392 | if(mb->cache_used == mb->cache_allocated) |
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| 393 | av_log(ctx, AV_LOG_INFO, "Mandelbrot cache is too small!\n"); |
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| 394 | } |
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| 395 | |||
| 396 | static int request_frame(AVFilterLink *link) |
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| 397 | { |
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| 398 | MBContext *mb = link->src->priv; |
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| 399 | AVFrame *picref = ff_get_video_buffer(link, mb->w, mb->h); |
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| 400 | if (!picref) |
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| 401 | return AVERROR(ENOMEM); |
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| 402 | |||
| 403 | picref->sample_aspect_ratio = (AVRational) {1, 1}; |
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| 404 | picref->pts = mb->pts++; |
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| 405 | |||
| 406 | draw_mandelbrot(link->src, (uint32_t*)picref->data[0], picref->linesize[0]/4, picref->pts); |
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| 407 | return ff_filter_frame(link, picref); |
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| 408 | } |
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| 409 | |||
| 410 | static const AVFilterPad mandelbrot_outputs[] = { |
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| 411 | { |
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| 412 | .name = "default", |
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| 413 | .type = AVMEDIA_TYPE_VIDEO, |
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| 414 | .request_frame = request_frame, |
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| 415 | .config_props = config_props, |
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| 416 | }, |
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| 417 | { NULL } |
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| 418 | }; |
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| 419 | |||
| 420 | AVFilter avfilter_vsrc_mandelbrot = { |
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| 421 | .name = "mandelbrot", |
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| 422 | .description = NULL_IF_CONFIG_SMALL("Render a Mandelbrot fractal."), |
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| 423 | .priv_size = sizeof(MBContext), |
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| 424 | .priv_class = &mandelbrot_class, |
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| 425 | .init = init, |
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| 426 | .uninit = uninit, |
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| 427 | .query_formats = query_formats, |
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| 428 | .inputs = NULL, |
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| 429 | .outputs = mandelbrot_outputs, |
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| 430 | }; |