mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
6 years ago
parent
55b32584b8
commit
9c3e1c1937
6 changed files with 230 additions and 2 deletions
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/*
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* Copyright (c) 2019 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* Sierpinski carpet fractal renderer |
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*/ |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "video.h" |
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#include "internal.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/parseutils.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/random_seed.h" |
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#include <float.h> |
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#include <math.h> |
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typedef struct SierpinskiContext { |
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const AVClass *class; |
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int w, h; |
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AVRational frame_rate; |
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uint64_t pts; |
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unsigned int seed; |
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int jump; |
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int pos_x, pos_y; |
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int dest_x, dest_y; |
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AVLFG lfg; |
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} SierpinskiContext; |
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#define OFFSET(x) offsetof(SierpinskiContext, x) |
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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static const AVOption sierpinski_options[] = { |
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{"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS }, |
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{"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS }, |
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{"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS }, |
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{"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS }, |
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{"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, UINT32_MAX, FLAGS }, |
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{"jump", "set the jump", OFFSET(jump), AV_OPT_TYPE_INT, {.i64=100}, 1, 10000, FLAGS }, |
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{NULL}, |
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}; |
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AVFILTER_DEFINE_CLASS(sierpinski); |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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static const enum AVPixelFormat pix_fmts[] = { |
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AV_PIX_FMT_0BGR32, |
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AV_PIX_FMT_NONE |
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}; |
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
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if (!fmts_list) |
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return AVERROR(ENOMEM); |
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return ff_set_common_formats(ctx, fmts_list); |
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} |
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static int config_output(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->src; |
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SierpinskiContext *s = ctx->priv; |
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if (av_image_check_size(s->w, s->h, 0, ctx) < 0) |
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return AVERROR(EINVAL); |
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inlink->w = s->w; |
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inlink->h = s->h; |
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inlink->time_base = av_inv_q(s->frame_rate); |
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inlink->sample_aspect_ratio = (AVRational) {1, 1}; |
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if (s->seed == -1) |
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s->seed = av_get_random_seed(); |
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av_lfg_init(&s->lfg, s->seed); |
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return 0; |
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} |
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static int fill_sierpinski(SierpinskiContext *s, int x, int y) |
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{ |
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int pos_x = x + s->pos_x; |
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int pos_y = y + s->pos_y; |
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while (pos_x != 0 && pos_y != 0) { |
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if (FFABS(pos_x % 3) == 1 && FFABS(pos_y % 3) == 1) |
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return 1; |
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pos_x /= 3; |
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pos_y /= 3; |
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} |
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return 0; |
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} |
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static int draw_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
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{ |
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SierpinskiContext *s = ctx->priv; |
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AVFrame *frame = arg; |
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const int width = frame->width; |
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const int height = frame->height; |
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const int start = (height * job ) / nb_jobs; |
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const int end = (height * (job+1)) / nb_jobs; |
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uint8_t *dst = frame->data[0] + start * frame->linesize[0]; |
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for (int y = start; y < end; y++) { |
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for (int x = 0; x < width; x++) { |
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if (fill_sierpinski(s, x, y)) { |
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AV_WL32(&dst[x*4], 0x00000000); |
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} else { |
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AV_WL32(&dst[x*4], 0xFFFFFFFF); |
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} |
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} |
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dst += frame->linesize[0]; |
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} |
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return 0; |
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} |
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static void draw_sierpinski(AVFilterContext *ctx, AVFrame *frame) |
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{ |
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SierpinskiContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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if (s->pos_x == s->dest_x && s->pos_y == s->dest_y) { |
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unsigned int rnd = av_lfg_get(&s->lfg); |
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int mod = 2 * s->jump + 1; |
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s->dest_x += (int)((rnd & 0xffff) % mod) - s->jump; |
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s->dest_y += (int)((rnd >> 16) % mod) - s->jump; |
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} else { |
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if (s->pos_x < s->dest_x) |
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s->pos_x++; |
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else if (s->pos_x > s->dest_x) |
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s->pos_x--; |
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if (s->pos_y < s->dest_y) |
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s->pos_y++; |
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else if (s->pos_y > s->dest_y) |
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s->pos_y--; |
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} |
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ctx->internal->execute(ctx, draw_slice, frame, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx))); |
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} |
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static int sierpinski_request_frame(AVFilterLink *link) |
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{ |
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SierpinskiContext *s = link->src->priv; |
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AVFrame *frame = ff_get_video_buffer(link, s->w, s->h); |
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if (!frame) |
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return AVERROR(ENOMEM); |
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frame->sample_aspect_ratio = (AVRational) {1, 1}; |
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frame->pts = s->pts++; |
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draw_sierpinski(link->src, frame); |
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return ff_filter_frame(link, frame); |
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} |
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static const AVFilterPad sierpinski_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.request_frame = sierpinski_request_frame, |
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.config_props = config_output, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_vsrc_sierpinski = { |
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.name = "sierpinski", |
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.description = NULL_IF_CONFIG_SMALL("Render a Sierpinski carpet fractal."), |
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.priv_size = sizeof(SierpinskiContext), |
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.priv_class = &sierpinski_class, |
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.query_formats = query_formats, |
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.inputs = NULL, |
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.outputs = sierpinski_outputs, |
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.flags = AVFILTER_FLAG_SLICE_THREADS, |
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}; |
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