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vf_noise.c File Reference

noise generator More...

#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/lfg.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures

struct  FilterParams
 filter data More...
 
struct  NoiseContext
 

Macros

#define MAX_NOISE   4096
 
#define MAX_SHIFT   1024
 
#define MAX_RES   (MAX_NOISE-MAX_SHIFT)
 
#define NOISE_UNIFORM   1
 
#define NOISE_TEMPORAL   2
 
#define NOISE_QUALITY   4
 
#define NOISE_AVERAGED   8
 
#define NOISE_PATTERN   16
 
#define OFFSET(x)   offsetof(NoiseContext, x)
 
#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 
#define NOISE_PARAMS(name, x, param)
 
#define RAND_N(range)   ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))
 

Functions

 AVFILTER_DEFINE_CLASS (noise)
 
static int init_noise (NoiseContext *n, int comp)
 
static av_cold int init (AVFilterContext *ctx, const char *args)
 
static int query_formats (AVFilterContext *ctx)
 
static int config_input (AVFilterLink *inlink)
 
static void line_noise (uint8_t *dst, const uint8_t *src, int8_t *noise, int len, int shift)
 
static void line_noise_avg (uint8_t *dst, const uint8_t *src, int len, int8_t **shift)
 
static void noise (uint8_t *dst, const uint8_t *src, int dst_linesize, int src_linesize, int width, int height, NoiseContext *n, int comp)
 
static int filter_frame (AVFilterLink *inlink, AVFilterBufferRef *inpicref)
 
static av_cold void uninit (AVFilterContext *ctx)
 

Variables

static const AVOption noise_options []
 
static const int8_t patt [4] = { -1, 0, 1, 0 }
 
static const AVFilterPad noise_inputs []
 
static const AVFilterPad noise_outputs []
 
AVFilter avfilter_vf_noise
 

Detailed Description

noise generator

Definition in file vf_noise.c.

Macro Definition Documentation

#define MAX_NOISE   4096

Definition at line 37 of file vf_noise.c.

Referenced by init_noise().

#define MAX_SHIFT   1024

Definition at line 38 of file vf_noise.c.

Referenced by init_noise(), and noise().

#define MAX_RES   (MAX_NOISE-MAX_SHIFT)

Definition at line 39 of file vf_noise.c.

Referenced by init_noise().

#define NOISE_UNIFORM   1

Definition at line 41 of file vf_noise.c.

Referenced by init_noise().

#define NOISE_TEMPORAL   2

Definition at line 42 of file vf_noise.c.

Referenced by noise().

#define NOISE_QUALITY   4

Definition at line 43 of file vf_noise.c.

Referenced by noise().

#define NOISE_AVERAGED   8

Definition at line 44 of file vf_noise.c.

Referenced by init_noise(), and noise().

#define NOISE_PATTERN   16

Definition at line 45 of file vf_noise.c.

Referenced by init_noise().

#define OFFSET (   x)    offsetof(NoiseContext, x)

Definition at line 68 of file vf_noise.c.

Definition at line 69 of file vf_noise.c.

#define NOISE_PARAMS (   name,
  x,
  param 
)
Value:
{#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
{#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
{#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
{#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
{#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
{"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \
{"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \
{"q", "high quality", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_QUALITY}, 0, 0, FLAGS, #name"_flags"}, \
{"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \
{"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"},

Definition at line 71 of file vf_noise.c.

#define RAND_N (   range)    ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0)))

Definition at line 96 of file vf_noise.c.

Referenced by init_noise().

Function Documentation

AVFILTER_DEFINE_CLASS ( noise  )
static int init_noise ( NoiseContext n,
int  comp 
)
static

Definition at line 97 of file vf_noise.c.

Referenced by init().

static av_cold int init ( AVFilterContext ctx,
const char *  args 
)
static

Definition at line 167 of file vf_noise.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 197 of file vf_noise.c.

static int config_input ( AVFilterLink inlink)
static

Definition at line 212 of file vf_noise.c.

static void line_noise ( uint8_t dst,
const uint8_t src,
int8_t *  noise,
int  len,
int  shift 
)
static

Definition at line 231 of file vf_noise.c.

Referenced by noise().

static void line_noise_avg ( uint8_t dst,
const uint8_t src,
int  len,
int8_t **  shift 
)
static

Definition at line 244 of file vf_noise.c.

Referenced by noise().

static void noise ( uint8_t dst,
const uint8_t src,
int  dst_linesize,
int  src_linesize,
int  width,
int  height,
NoiseContext n,
int  comp 
)
static

Definition at line 256 of file vf_noise.c.

Referenced by filter_frame(), and init_noise().

static int filter_frame ( AVFilterLink inlink,
AVFilterBufferRef inpicref 
)
static

Definition at line 301 of file vf_noise.c.

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 329 of file vf_noise.c.

Variable Documentation

const AVOption noise_options[]
static
Initial value:
= {
NOISE_PARAMS(c3, 3, param[3])
{NULL}
}

Definition at line 83 of file vf_noise.c.

const int8_t patt[4] = { -1, 0, 1, 0 }
static

Definition at line 94 of file vf_noise.c.

Referenced by init_noise().

const AVFilterPad noise_inputs[]
static
Initial value:
= {
{
.name = "default",
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
.config_props = config_input,
.min_perms = AV_PERM_READ,
},
{ NULL }
}

Definition at line 339 of file vf_noise.c.

const AVFilterPad noise_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}

Definition at line 351 of file vf_noise.c.

AVFilter avfilter_vf_noise
Initial value:
= {
.name = "noise",
.description = NULL_IF_CONFIG_SMALL("Add noise."),
.priv_size = sizeof(NoiseContext),
.init = init,
.priv_class = &noise_class,
}

Definition at line 359 of file vf_noise.c.