lavfi: add Perlin noise generator

Stefano Sabatini committed 2 years ago

Commit 3764b8e1 parent c9151ea7 files · +597 −0Browse files

Showing the changes to libavfilter (5 of 7 files). Show all

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5 files

libavfilter/Makefile +1 −0
libavfilter/allfilters.c +1 −0
libavfilter/perlin.c +224 −0
libavfilter/perlin.h +101 −0
libavfilter/vsrc_perlin.c +169 −0

@@ -603,6 +603,7 @@ OBJS-$(CONFIG_NULLSRC_FILTER) += vsrc_testsrc.o · 602 unmodified lines
603	OBJS-$(CONFIG_OPENCLSRC_FILTER) += vf_program_opencl.o opencl.o	603	OBJS-$(CONFIG_OPENCLSRC_FILTER) += vf_program_opencl.o opencl.o
604	OBJS-$(CONFIG_PAL75BARS_FILTER) += vsrc_testsrc.o	604	OBJS-$(CONFIG_PAL75BARS_FILTER) += vsrc_testsrc.o
605	OBJS-$(CONFIG_PAL100BARS_FILTER) += vsrc_testsrc.o	605	OBJS-$(CONFIG_PAL100BARS_FILTER) += vsrc_testsrc.o
		606	OBJS-$(CONFIG_PERLIN_FILTER) += vsrc_perlin.o perlin.o
606	OBJS-$(CONFIG_QRENCODE_FILTER) += qrencode.o textutils.o	607	OBJS-$(CONFIG_QRENCODE_FILTER) += qrencode.o textutils.o
607	OBJS-$(CONFIG_QRENCODESRC_FILTER) += qrencode.o textutils.o	608	OBJS-$(CONFIG_QRENCODESRC_FILTER) += qrencode.o textutils.o
608	OBJS-$(CONFIG_RGBTESTSRC_FILTER) += vsrc_testsrc.o	609	OBJS-$(CONFIG_RGBTESTSRC_FILTER) += vsrc_testsrc.o

libavfilter/allfilters.c+1−0

@@ -569,6 +569,7 @@ extern const AVFilter ff_vsrc_openclsrc; · 568 unmodified lines
569	extern const AVFilter ff_vsrc_qrencodesrc;	569	extern const AVFilter ff_vsrc_qrencodesrc;
570	extern const AVFilter ff_vsrc_pal75bars;	570	extern const AVFilter ff_vsrc_pal75bars;
571	extern const AVFilter ff_vsrc_pal100bars;	571	extern const AVFilter ff_vsrc_pal100bars;
		572	extern const AVFilter ff_vsrc_perlin;
572	extern const AVFilter ff_vsrc_rgbtestsrc;	573	extern const AVFilter ff_vsrc_rgbtestsrc;
573	extern const AVFilter ff_vsrc_sierpinski;	574	extern const AVFilter ff_vsrc_sierpinski;
574	extern const AVFilter ff_vsrc_smptebars;	575	extern const AVFilter ff_vsrc_smptebars;

libavfilter/perlin.c+224−0

@@ -0,0 +1,224 @@
	1	/*
	2	* This file is part of FFmpeg.
	3	*
	4	* FFmpeg is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (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
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	17	*/
	18
	19	/**
	20	* @file
	21	* Perlin Noise generator, based on code from:
	22	* https://adrianb.io/2014/08/09/perlinnoise.html
	23	*
	24	* Original article from Ken Perlin:
	25	* http://mrl.nyu.edu/~perlin/paper445.pdf
	26	*/
	27
	28	#include <math.h>
	29
	30	#include "libavutil/lfg.h"
	31	#include "libavutil/random_seed.h"
	32	#include "perlin.h"
	33
	34	static inline int inc(int num, int period)
	35	{
	36	num++;
	37	if (period > 0)
	38	num %= period;
	39	return num;
	40	}
	41
	42	static inline double grad(int hash, double x, double y, double z)
	43	{
	44	// Take the hashed value and take the first 4 bits of it (15 == 0b1111)
	45	int h = hash & 15;
	46	// If the most significant bit (MSB) of the hash is 0 then set u = x. Otherwise y.
	47	double u = h < 8 /* 0b1000 */ ? x : y;
	48	double v;
	49
	50	// In Ken Perlin's original implementation this was another
	51	// conditional operator (?:), then expanded for readability.
	52	if (h < 4 /* 0b0100 */)
	53	// If the first and second significant bits are 0 set v = y
	54	v = y;
	55	// If the first and second significant bits are 1 set v = x
	56	else if (h == 12 /* 0b1100 / \|\| h == 14 / 0b1110 */)
	57	v = x;
	58	else
	59	// If the first and second significant bits are not equal (0/1, 1/0) set v = z
	60	v = z;
	61
	62	// Use the last 2 bits to decide if u and v are positive or negative. Then return their addition.
	63	return ((h&1) == 0 ? u : -u)+((h&2) == 0 ? v : -v);
	64	}
	65
	66	static inline double fade(double t)
	67	{
	68	// Fade function as defined by Ken Perlin. This eases coordinate values
	69	// so that they will "ease" towards integral values. This ends up smoothing
	70	// the final output.
	71	// use Horner method to compute: 6t^5 - 15t^4 + 10t^3
	72	return t * t * t * (t * (t * 6 - 15) + 10);
	73	}
	74
	75	static double lerp(double a, double b, double x)
	76	{
	77	return a + x * (b - a);
	78	}
	79
	80	// Hash lookup table as defined by Ken Perlin. This is a randomly
	81	// arranged array of all numbers from 0-255 inclusive.
	82	static uint8_t ken_permutations[] = {
	83	151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225,
	84	140, 36, 103, 30, 69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148,
	85	247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203, 117, 35, 11, 32,
	86	57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175,
	87	74, 165, 71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122,
	88	60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245, 40, 244, 102, 143, 54,
	89	65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169,
	90	200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64,
	91	52, 217, 226, 250, 124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212,
	92	207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213,
	93	119, 248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9,
	94	129, 22, 39, 253, 19, 98, 108, 110, 79, 113, 224, 232, 178, 185, 112, 104,
	95	218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162, 241,
	96	81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157,
	97	184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93,
	98	222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180
	99	};
	100
	101	int ff_perlin_init(FFPerlin *perlin, double period, int octaves, double persistence,
	102	enum FFPerlinRandomMode random_mode, unsigned int random_seed)
	103	{
	104	int i;
	105
	106	perlin->period = period;
	107	perlin->octaves = octaves;
	108	perlin->persistence = persistence;
	109	perlin->random_mode = random_mode;
	110	perlin->random_seed = random_seed;
	111
	112	if (perlin->random_mode == FF_PERLIN_RANDOM_MODE_KEN) {
	113	for (i = 0; i < 512; i++) {
	114	perlin->permutations[i] = ken_permutations[i % 256];
	115	}
	116	} else {
	117	AVLFG lfg;
	118	uint8_t random_permutations[256];
	119
	120	if (perlin->random_mode == FF_PERLIN_RANDOM_MODE_RANDOM)
	121	perlin->random_seed = av_get_random_seed();
	122
	123	av_lfg_init(&lfg, perlin->random_seed);
	124
	125	for (i = 0; i < 256; i++) {
	126	random_permutations[i] = i;
	127	}
	128
	129	for (i = 0; i < 256; i++) {
	130	unsigned int random_idx = av_lfg_get(&lfg) % (256-i);
	131	uint8_t random_val = random_permutations[random_idx];
	132	random_permutations[random_idx] = random_permutations[256-i];
	133
	134	perlin->permutations[i] = perlin->permutations[i+256] = random_val;
	135	}
	136	}
	137
	138	return 0;
	139	}
	140
	141	static double perlin_get(FFPerlin *perlin, double x, double y, double z)
	142	{
	143	int xi, yi, zi;
	144	double xf, yf, zf;
	145	double u, v, w;
	146	const uint8_t *p = perlin->permutations;
	147	double period = perlin->period;
	148	int aaa, aba, aab, abb, baa, bba, bab, bbb;
	149	double x1, x2, y1, y2;
	150
	151	if (perlin->period > 0) {
	152	// If we have any period on, change the coordinates to their "local" repetitions
	153	x = fmod(x, perlin->period);
	154	y = fmod(y, perlin->period);
	155	z = fmod(z, perlin->period);
	156	}
	157
	158	// Calculate the "unit cube" that the point asked will be located in
	159	// The left bound is ( \|_x_\|,\|_y_\|,\|_z_\| ) and the right bound is that
	160	// plus 1. Next we calculate the location (from 0.0 to 1.0) in that cube.
	161	xi = (int)x & 255;
	162	yi = (int)y & 255;
	163	zi = (int)z & 255;
	164
	165	xf = x - (int)x;
	166	yf = y - (int)y;
	167	zf = z - (int)z;
	168
	169	// We also fade the location to smooth the result.
	170	u = fade(xf);
	171	v = fade(yf);
	172	w = fade(zf);
	173
	174	aaa = p[p[p[ xi ] + yi ] + zi ];
	175	aba = p[p[p[ xi ] + inc(yi, period)] + zi ];
	176	aab = p[p[p[ xi ] + yi ] + inc(zi, period)];
	177	abb = p[p[p[ xi ] + inc(yi, period)] + inc(zi, period)];
	178	baa = p[p[p[inc(xi, period)] + yi ] + zi ];
	179	bba = p[p[p[inc(xi, period)] + inc(yi, period)] + zi ];
	180	bab = p[p[p[inc(xi, period)] + yi ] + inc(zi, period)];
	181	bbb = p[p[p[inc(xi, period)] + inc(yi, period)] + inc(zi, period)];
	182
	183	// The gradient function calculates the dot product between a pseudorandom
	184	// gradient vector and the vector from the input coordinate to the 8
	185	// surrounding points in its unit cube.
	186	// This is all then lerped together as a sort of weighted average based on the faded (u,v,w)
	187	// values we made earlier.
	188	x1 = lerp(grad(aaa, xf , yf , zf),
	189	grad(baa, xf-1, yf , zf),
	190	u);
	191	x2 = lerp(grad(aba, xf , yf-1, zf),
	192	grad(bba, xf-1, yf-1, zf),
	193	u);
	194	y1 = lerp(x1, x2, v);
	195
	196	x1 = lerp(grad(aab, xf , yf , zf-1),
	197	grad(bab, xf-1, yf , zf-1),
	198	u);
	199	x2 = lerp(grad(abb, xf , yf-1, zf-1),
	200	grad(bbb, xf-1, yf-1, zf-1),
	201	u);
	202	y2 = lerp(x1, x2, v);
	203
	204	// For convenience we bound it to 0 - 1 (theoretical min/max before is -1 - 1)
	205	return (lerp(y1, y2, w) + 1) / 2;
	206	}
	207
	208	double ff_perlin_get(FFPerlin *perlin, double x, double y, double z)
	209	{
	210	double total = 0;
	211	double frequency = 1;
	212	double amplitude = 1;
	213	double max_value = 0; // Used for normalizing result to 0.0 - 1.0
	214
	215	for (int i = 0; i < perlin->octaves; i++) {
	216	total += perlin_get(perlin, x * frequency, y * frequency, z * frequency) * amplitude;
	217	max_value += amplitude;
	218	amplitude *= perlin->persistence;
	219	frequency *= 2;
	220	}
	221
	222	return total / max_value;
	223	}
	224

libavfilter/perlin.h+101−0

@@ -0,0 +1,101 @@
	1	/*
	2	* Perlin noise generator
	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
	21	/**
	22	* @file
	23	* Perlin Noise generator
	24	*/
	25
	26	#ifndef AVFILTER_PERLIN_H
	27	#define AVFILTER_PERLIN_H
	28
	29	#include <stdint.h>
	30
	31	enum FFPerlinRandomMode {
	32	FF_PERLIN_RANDOM_MODE_RANDOM,
	33	FF_PERLIN_RANDOM_MODE_KEN,
	34	FF_PERLIN_RANDOM_MODE_SEED,
	35	FF_PERLIN_RANDOM_MODE_NB
	36	};
	37
	38	/**
	39	* Perlin generator context. This needs to be initialized with the
	40	* parameters used to generate the Perlin noise.
	41	*/
	42	typedef struct FFPerlin {
	43	/**
	44	* spatial repeat period, if negative it is ignored
	45	*/
	46	double period;
	47
	48	/**
	49	* total number of components making up the noise, each one with
	50	* doubled frequency
	51	*/
	52	int octaves;
	53
	54	/**
	55	* ratio used to compute the amplitude of the next octave
	56	* component with respect to the previous component
	57	*/
	58	double persistence;
	59
	60	/**
	61	* permutations array used to compute the Perlin noise hash
	62	*/
	63	uint8_t permutations[512];
	64
	65	/**
	66	* define how to compute the permutations array
	67	*/
	68	enum FFPerlinRandomMode random_mode;
	69
	70	/**
	71	* when random_mode is set FF_PERLIN_RANDOM_MODE_RANDOM, set random
	72	* seed used to compute the permutations array
	73	*/
	74	unsigned int random_seed;
	75	} FFPerlin;
	76
	77	/**
	78	* Initialize the Perlin noise generator with parameters.
	79	*
	80	* @param perlin Perlin noise generator context
	81	* @param period spatial repeat period, if negative it is ignored
	82	* @param octaves total number of components making up the noise, each one with doubled frequency
	83	* @param persistence define ratio used to compute the amplitude of the next octave
	84	* component with respect to the previous component
	85	* @param random_mode define how to compute the permutations array
	86	* @param random_seed when random_mode is set to FF_PERLIN_RANDOM_MODE_RANDOM, set random
	87	* seed used to compute the permutations array
	88	* @return a negative AVERROR code in case of error, a non negative value otherwise
	89	*/
	90	int ff_perlin_init(FFPerlin *perlin, double period, int octaves, double persistence,
	91	enum FFPerlinRandomMode random_mode, unsigned int random_seed);
	92
	93	/**
	94	* Compute Perlin noise given the x, y, z coordinates.
	95	*
	96	* @param perlin Perlin noise generator context
	97	* @return normalized value for the perlin noise, in the range [0, 1]
	98	*/
	99	double ff_perlin_get(FFPerlin *perlin, double x, double y, double z);
	100
	101	#endif /* AVFILTER_PERLIN_H */

libavfilter/vsrc_perlin.c+169−0

@@ -0,0 +1,169 @@
	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 "internal.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
	99	outlink->w = perlin->w;
	100	outlink->h = perlin->h;
	101	outlink->time_base = av_inv_q(perlin->frame_rate);
	102	outlink->frame_rate = perlin->frame_rate;
	103
	104	return 0;
	105	}
	106
	107	static int request_frame(AVFilterLink *outlink)
	108	{
	109	AVFilterContext *ctx = outlink->src;
	110	PerlinContext *perlin = ctx->priv;
	111	AVFrame *picref = ff_get_video_buffer(outlink, perlin->w, perlin->h);
	112	int i, j;
	113	uint8_t data0, data;
	114	double x, y, t;
	115
	116	if (!picref)
	117	return AVERROR(ENOMEM);
	118
	119	picref->sample_aspect_ratio = (AVRational) {1, 1};
	120	picref->pts = perlin->pts++;
	121	picref->duration = 1;
	122
	123	t = perlin->tscale * (perlin->pts * av_q2d(outlink->time_base));
	124	data0 = picref->data[0];
	125
	126	for (i = 0; i < perlin->h; i++) {
	127	y = perlin->yscale * (double)i / perlin->h;
	128
	129	data = data0;
	130
	131	for (j = 0; j < perlin->w; j++) {
	132	double res;
	133	x = perlin->xscale * (double)j / perlin->w;
	134	res = ff_perlin_get(&perlin->perlin, x, y, t);
	135	av_log(ctx, AV_LOG_DEBUG, "x:%f y:%f t:%f => %f\n", x, y, t, res);
	136	data++ = res 255;
	137	}
	138	data0 += picref->linesize[0];
	139	}
	140
	141	return ff_filter_frame(outlink, picref);
	142	}
	143
	144	static int query_formats(AVFilterContext *ctx)
	145	{
	146	enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
	147
	148	return ff_set_common_formats_from_list(ctx, pix_fmts);
	149	}
	150
	151	static const AVFilterPad perlin_outputs[] = {
	152	{
	153	.name = "default",
	154	.type = AVMEDIA_TYPE_VIDEO,
	155	.request_frame = request_frame,
	156	.config_props = config_props,
	157	},
	158	};
	159
	160	const AVFilter ff_vsrc_perlin = {
	161	.name = "perlin",
	162	.description = NULL_IF_CONFIG_SMALL("Generate Perlin noise"),
	163	.priv_size = sizeof(PerlinContext),
	164	.priv_class = &perlin_class,
	165	.init = init,
	166	.inputs = NULL,
	167	FILTER_OUTPUTS(perlin_outputs),
	168	FILTER_QUERY_FUNC(query_formats),
	169	};

lavfi: add Perlin noise generator

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