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avfilter: add sierpinski video source
This commit is contained in:
Paul B Mahol
parent
55b32584b8
commit
9c3e1c1937
@ -11,6 +11,7 @@ version <next>:
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- ZeroMQ protocol
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- support Sipro ACELP.KELVIN decoding
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- streamhash muxer
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- sierpinski video source
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version 4.2:
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@ -21008,6 +21008,28 @@ __kernel void sierpinski_carpet(__write_only image2d_t dst,
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@end itemize
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@section sierpinski
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Generate a Sierpinksi carpet fractal, and randomly pan around.
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This source accepts the following options:
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@table @option
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@item size, s
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Set frame size. For the syntax of this option, check the @ref{video size syntax,,"Video
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size" section in the ffmpeg-utils manual,ffmpeg-utils}. Default value is "640x480".
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@item rate, r
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Set frame rate, expressed as number of frames per second. Default
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value is "25".
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@item seed
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Set seed which is used for random panning.
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@item jump
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Set max jump for single pan destination. Allowed range is from 1 to 10000.
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@end table
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@c man end VIDEO SOURCES
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@chapter Video Sinks
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@ -452,6 +452,7 @@ OBJS-$(CONFIG_OPENCLSRC_FILTER) += vf_program_opencl.o opencl.o
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OBJS-$(CONFIG_PAL75BARS_FILTER) += vsrc_testsrc.o
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OBJS-$(CONFIG_PAL100BARS_FILTER) += vsrc_testsrc.o
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OBJS-$(CONFIG_RGBTESTSRC_FILTER) += vsrc_testsrc.o
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OBJS-$(CONFIG_SMPTEBARS_FILTER) += vsrc_sierpinski.o
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OBJS-$(CONFIG_SMPTEBARS_FILTER) += vsrc_testsrc.o
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OBJS-$(CONFIG_SMPTEHDBARS_FILTER) += vsrc_testsrc.o
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OBJS-$(CONFIG_TESTSRC_FILTER) += vsrc_testsrc.o
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@ -430,6 +430,7 @@ extern AVFilter ff_vsrc_openclsrc;
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extern AVFilter ff_vsrc_pal75bars;
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extern AVFilter ff_vsrc_pal100bars;
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extern AVFilter ff_vsrc_rgbtestsrc;
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extern AVFilter ff_vsrc_sierpinski;
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extern AVFilter ff_vsrc_smptebars;
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extern AVFilter ff_vsrc_smptehdbars;
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extern AVFilter ff_vsrc_testsrc;
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@ -30,8 +30,8 @@
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#include "libavutil/version.h"
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#define LIBAVFILTER_VERSION_MAJOR 7
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#define LIBAVFILTER_VERSION_MINOR 58
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#define LIBAVFILTER_VERSION_MICRO 102
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#define LIBAVFILTER_VERSION_MINOR 59
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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203
libavfilter/vsrc_sierpinski.c
Normal file
203
libavfilter/vsrc_sierpinski.c
Normal file
@ -0,0 +1,203 @@
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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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