| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | /** | ||
| 20 | * @file | ||
| 21 | * Perlin noise generator | ||
| 22 | */ | ||
| 23 | |||
| 24 | #include <float.h> | ||
| 25 | |||
| 26 | #include "perlin.h" | ||
| 27 | #include "libavutil/lfg.h" | ||
| 28 | #include "libavutil/opt.h" | ||
| 29 | #include "avfilter.h" | ||
| 30 | #include "filters.h" | ||
| 31 | #include "formats.h" | ||
| 32 | #include "video.h" | ||
| 33 | |||
| 34 | typedef struct PerlinContext { | ||
| 35 | const AVClass *class; | ||
| 36 | |||
| 37 | int w, h; | ||
| 38 | AVRational frame_rate; | ||
| 39 | |||
| 40 | FFPerlin perlin; | ||
| 41 | int octaves; | ||
| 42 | double persistence; | ||
| 43 | unsigned int random_seed; | ||
| 44 | enum FFPerlinRandomMode random_mode; | ||
| 45 | |||
| 46 | double xscale, yscale, tscale; | ||
| 47 | uint64_t pts; | ||
| 48 | } PerlinContext; | ||
| 49 | |||
| 50 | #define OFFSET(x) offsetof(PerlinContext, x) | ||
| 51 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 52 | |||
| 53 | static const AVOption perlin_options[] = { | ||
| 54 | { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="320x240"}, 0, 0, FLAGS }, | ||
| 55 | { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="320x240"}, 0, 0, FLAGS }, | ||
| 56 | { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS }, | ||
| 57 | { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS }, | ||
| 58 | { "octaves", "set the number of components to use to generate the noise", OFFSET(octaves), AV_OPT_TYPE_INT, {.i64=1}, 1, INT_MAX, FLAGS }, | ||
| 59 | { "persistence", "set the octaves persistence", OFFSET(persistence), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS }, | ||
| 60 | |||
| 61 | { "xscale", "set x-scale factor", OFFSET(xscale), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS }, | ||
| 62 | { "yscale", "set y-scale factor", OFFSET(yscale), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS }, | ||
| 63 | { "tscale", "set t-scale factor", OFFSET(tscale), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS }, | ||
| 64 | |||
| 65 | { "random_mode", "set random mode used to compute initial pattern", OFFSET(random_mode), AV_OPT_TYPE_INT, {.i64=FF_PERLIN_RANDOM_MODE_RANDOM}, 0, FF_PERLIN_RANDOM_MODE_NB-1, FLAGS, .unit = "random_mode" }, | ||
| 66 | { "random", "compute and use random seed", 0, AV_OPT_TYPE_CONST, {.i64=FF_PERLIN_RANDOM_MODE_RANDOM}, 0, 0, FLAGS, .unit = "random_mode" }, | ||
| 67 | { "ken", "use the predefined initial pattern defined by Ken Perlin in the original article", 0, AV_OPT_TYPE_CONST, {.i64=FF_PERLIN_RANDOM_MODE_KEN}, 0, 0, FLAGS, .unit = "random_mode" }, | ||
| 68 | { "seed", "use the value specified by random_seed", 0, AV_OPT_TYPE_CONST, {.i64=FF_PERLIN_RANDOM_MODE_SEED}, 0, 0, FLAGS, .unit="random_mode" }, | ||
| 69 | |||
| 70 | { "random_seed", "set the seed for filling the initial pattern", OFFSET(random_seed), AV_OPT_TYPE_UINT, {.i64=0}, 0, UINT_MAX, FLAGS }, | ||
| 71 | { "seed", "set the seed for filling the initial pattern", OFFSET(random_seed), AV_OPT_TYPE_UINT, {.i64=0}, 0, UINT_MAX, FLAGS }, | ||
| 72 | { NULL } | ||
| 73 | }; | ||
| 74 | |||
| 75 | AVFILTER_DEFINE_CLASS(perlin); | ||
| 76 | |||
| 77 | ✗ | static av_cold int init(AVFilterContext *ctx) | |
| 78 | { | ||
| 79 | ✗ | PerlinContext *perlin = ctx->priv; | |
| 80 | int ret; | ||
| 81 | |||
| 82 | ✗ | if (ret = ff_perlin_init(&perlin->perlin, -1, perlin->octaves, perlin->persistence, | |
| 83 | perlin->random_mode, perlin->random_seed)) { | ||
| 84 | ✗ | return ret; | |
| 85 | } | ||
| 86 | |||
| 87 | ✗ | av_log(ctx, AV_LOG_VERBOSE, | |
| 88 | "s:%dx%d r:%d/%d octaves:%d persistence:%f xscale:%f yscale:%f tscale:%f\n", | ||
| 89 | perlin->w, perlin->h, perlin->frame_rate.num, perlin->frame_rate.den, | ||
| 90 | perlin->octaves, perlin->persistence, | ||
| 91 | perlin->xscale, perlin->yscale, perlin->tscale); | ||
| 92 | ✗ | return 0; | |
| 93 | } | ||
| 94 | |||
| 95 | ✗ | static int config_props(AVFilterLink *outlink) | |
| 96 | { | ||
| 97 | ✗ | PerlinContext *perlin = outlink->src->priv; | |
| 98 | ✗ | FilterLink *l = ff_filter_link(outlink); | |
| 99 | |||
| 100 | ✗ | outlink->w = perlin->w; | |
| 101 | ✗ | outlink->h = perlin->h; | |
| 102 | ✗ | outlink->time_base = av_inv_q(perlin->frame_rate); | |
| 103 | ✗ | l->frame_rate = perlin->frame_rate; | |
| 104 | |||
| 105 | ✗ | return 0; | |
| 106 | } | ||
| 107 | |||
| 108 | ✗ | static int request_frame(AVFilterLink *outlink) | |
| 109 | { | ||
| 110 | ✗ | AVFilterContext *ctx = outlink->src; | |
| 111 | ✗ | PerlinContext *perlin = ctx->priv; | |
| 112 | ✗ | AVFrame *picref = ff_get_video_buffer(outlink, perlin->w, perlin->h); | |
| 113 | int i, j; | ||
| 114 | uint8_t *data0, *data; | ||
| 115 | double x, y, t; | ||
| 116 | |||
| 117 | ✗ | if (!picref) | |
| 118 | ✗ | return AVERROR(ENOMEM); | |
| 119 | |||
| 120 | ✗ | picref->sample_aspect_ratio = (AVRational) {1, 1}; | |
| 121 | ✗ | picref->pts = perlin->pts++; | |
| 122 | ✗ | picref->duration = 1; | |
| 123 | |||
| 124 | ✗ | t = perlin->tscale * (perlin->pts * av_q2d(outlink->time_base)); | |
| 125 | ✗ | data0 = picref->data[0]; | |
| 126 | |||
| 127 | ✗ | for (i = 0; i < perlin->h; i++) { | |
| 128 | ✗ | y = perlin->yscale * (double)i / perlin->h; | |
| 129 | |||
| 130 | ✗ | data = data0; | |
| 131 | |||
| 132 | ✗ | for (j = 0; j < perlin->w; j++) { | |
| 133 | double res; | ||
| 134 | ✗ | x = perlin->xscale * (double)j / perlin->w; | |
| 135 | ✗ | res = ff_perlin_get(&perlin->perlin, x, y, t); | |
| 136 | ✗ | av_log(ctx, AV_LOG_DEBUG, "x:%f y:%f t:%f => %f\n", x, y, t, res); | |
| 137 | ✗ | *data++ = res * 255; | |
| 138 | } | ||
| 139 | ✗ | data0 += picref->linesize[0]; | |
| 140 | } | ||
| 141 | |||
| 142 | ✗ | return ff_filter_frame(outlink, picref); | |
| 143 | } | ||
| 144 | |||
| 145 | ✗ | static int query_formats(const AVFilterContext *ctx, | |
| 146 | AVFilterFormatsConfig **cfg_in, | ||
| 147 | AVFilterFormatsConfig **cfg_out) | ||
| 148 | { | ||
| 149 | ✗ | enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; | |
| 150 | |||
| 151 | ✗ | return ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, pix_fmts); | |
| 152 | } | ||
| 153 | |||
| 154 | static const AVFilterPad perlin_outputs[] = { | ||
| 155 | { | ||
| 156 | .name = "default", | ||
| 157 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 158 | .request_frame = request_frame, | ||
| 159 | .config_props = config_props, | ||
| 160 | }, | ||
| 161 | }; | ||
| 162 | |||
| 163 | const AVFilter ff_vsrc_perlin = { | ||
| 164 | .name = "perlin", | ||
| 165 | .description = NULL_IF_CONFIG_SMALL("Generate Perlin noise"), | ||
| 166 | .priv_size = sizeof(PerlinContext), | ||
| 167 | .priv_class = &perlin_class, | ||
| 168 | .init = init, | ||
| 169 | .inputs = NULL, | ||
| 170 | FILTER_OUTPUTS(perlin_outputs), | ||
| 171 | FILTER_QUERY_FUNC2(query_formats), | ||
| 172 | }; | ||
| 173 |