vsrc_perlin.c File Reference

#include <float.h>
#include "perlin.h"
#include "libavutil/lfg.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	PerlinContext

Macros
#define	OFFSET(x)   offsetof(PerlinContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (perlin)
static av_cold int	init (AVFilterContext *ctx)
static int	config_props (AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)

Variables
static const AVOption	perlin_options []
static const AVFilterPad	perlin_outputs []
const AVFilter	ff_vsrc_perlin

Detailed Description

Perlin noise generator

Definition in file vsrc_perlin.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(PerlinContext, x)

Definition at line 50 of file vsrc_perlin.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 51 of file vsrc_perlin.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

perlin

)

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 77 of file vsrc_perlin.c.

config_props()

static int config_props ( AVFilterLink *  outlink )

static

Definition at line 95 of file vsrc_perlin.c.

request_frame()

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 108 of file vsrc_perlin.c.

query_formats()

static int query_formats ( const AVFilterContext *  ctx, AVFilterFormatsConfig **  cfg_in, AVFilterFormatsConfig **  cfg_out  )

static

Definition at line 145 of file vsrc_perlin.c.

Variable Documentation

perlin_options

const AVOption perlin_options[]

static

Initial value:

= {
    { "size",     "set video size", OFFSET(w),          AV_OPT_TYPE_IMAGE_SIZE, {.str="320x240"}, 0, 0, FLAGS },
    { "s",        "set video size", OFFSET(w),          AV_OPT_TYPE_IMAGE_SIZE, {.str="320x240"}, 0, 0, FLAGS },
    { "rate",     "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
    { "r",        "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
    { "octaves", "set the number of components to use to generate the noise", OFFSET(octaves), AV_OPT_TYPE_INT, {.i64=1}, 1, INT_MAX, FLAGS },
    { "persistence", "set the octaves persistence", OFFSET(persistence), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS },
 
    { "xscale", "set x-scale factor", OFFSET(xscale), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS },
    { "yscale", "set y-scale factor", OFFSET(yscale), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS },
    { "tscale", "set t-scale factor", OFFSET(tscale), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.0, DBL_MAX, FLAGS },
 
    { "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" },
    { "random", "compute and use random seed", 0, AV_OPT_TYPE_CONST, {.i64=FF_PERLIN_RANDOM_MODE_RANDOM},   0, 0, FLAGS, .unit = "random_mode" },
    { "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" },
    { "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" },
 
    { "random_seed", "set the seed for filling the initial pattern", OFFSET(random_seed), AV_OPT_TYPE_UINT, {.i64=0}, 0, UINT_MAX, FLAGS },
    { "seed",        "set the seed for filling the initial pattern", OFFSET(random_seed), AV_OPT_TYPE_UINT, {.i64=0}, 0, UINT_MAX, FLAGS },
    { NULL }
}

Definition at line 53 of file vsrc_perlin.c.

perlin_outputs

const AVFilterPad perlin_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .request_frame = request_frame,
        .config_props  = config_props,
    },
}

Definition at line 154 of file vsrc_perlin.c.

ff_vsrc_perlin

const AVFilter ff_vsrc_perlin

Initial value:

= {
    .name          = "perlin",
    .description   = NULL_IF_CONFIG_SMALL("Generate Perlin noise"),
    .priv_size     = sizeof(PerlinContext),
    .priv_class    = &perlin_class,
    .init          = init,
    .inputs        = NULL,
    FILTER_OUTPUTS(perlin_outputs),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 163 of file vsrc_perlin.c.