asrc_anoisesrc.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
#include "libavutil/lfg.h"
#include "libavutil/random_seed.h"

Go to the source code of this file.

Data Structures
struct	ANoiseSrcContext

Macros
#define	OFFSET(x)   offsetof(ANoiseSrcContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Enumerations
enum	NoiseMode {   NM_WHITE, NM_PINK, NM_BROWN, NM_BLUE,   NM_VIOLET, NM_VELVET, NM_NB }

Functions
	AVFILTER_DEFINE_CLASS (anoisesrc)
static av_cold int	query_formats (AVFilterContext *ctx)
static double	white_filter (double white, double *buf, double ha)
static double	pink_filter (double white, double *buf, double ha)
static double	blue_filter (double white, double *buf, double ha)
static double	brown_filter (double white, double *buf, double ha)
static double	violet_filter (double white, double *buf, double ha)
static double	velvet_filter (double white, double *buf, double ha)
static av_cold int	config_props (AVFilterLink *outlink)
static int	activate (AVFilterContext *ctx)

Variables
static const AVOption	anoisesrc_options []
static const AVFilterPad	anoisesrc_outputs []
const AVFilter	ff_asrc_anoisesrc

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(ANoiseSrcContext, x)

Definition at line 56 of file asrc_anoisesrc.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 57 of file asrc_anoisesrc.c.

Enumeration Type Documentation

NoiseMode

enum NoiseMode

Enumerator
NM_WHITE
NM_PINK
NM_BROWN
NM_BLUE
NM_VIOLET
NM_VELVET
NM_NB

Definition at line 46 of file asrc_anoisesrc.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

anoisesrc

)

query_formats()

static av_cold int query_formats ( AVFilterContext *  ctx )

static

Definition at line 84 of file asrc_anoisesrc.c.

white_filter()

static double white_filter ( double  white, double *  buf, double  ha  )

static

Definition at line 104 of file asrc_anoisesrc.c.

Referenced by config_props().

pink_filter()

static double pink_filter ( double  white, double *  buf, double  ha  )

static

Definition at line 109 of file asrc_anoisesrc.c.

Referenced by config_props().

blue_filter()

static double blue_filter ( double  white, double *  buf, double  ha  )

static

Definition at line 125 of file asrc_anoisesrc.c.

Referenced by config_props().

brown_filter()

static double brown_filter ( double  white, double *  buf, double  ha  )

static

Definition at line 141 of file asrc_anoisesrc.c.

Referenced by config_props().

violet_filter()

static double violet_filter ( double  white, double *  buf, double  ha  )

static

Definition at line 150 of file asrc_anoisesrc.c.

Referenced by config_props().

velvet_filter()

static double velvet_filter ( double  white, double *  buf, double  ha  )

static

Definition at line 159 of file asrc_anoisesrc.c.

Referenced by config_props().

config_props()

static av_cold int config_props ( AVFilterLink *  outlink )

static

Definition at line 164 of file asrc_anoisesrc.c.

activate()

static int activate ( AVFilterContext *  ctx )

static

Definition at line 189 of file asrc_anoisesrc.c.

Variable Documentation

anoisesrc_options

const AVOption anoisesrc_options[]

static

Initial value:

= {
    { "sample_rate",  "set sample rate",  OFFSET(sample_rate),  AV_OPT_TYPE_INT,       {.i64 = 48000},     15,  INT_MAX,    FLAGS },
    { "r",            "set sample rate",  OFFSET(sample_rate),  AV_OPT_TYPE_INT,       {.i64 = 48000},     15,  INT_MAX,    FLAGS },
    { "amplitude",    "set amplitude",    OFFSET(amplitude),    AV_OPT_TYPE_DOUBLE,    {.dbl = 1.},        0.,  1.,         FLAGS },
    { "a",            "set amplitude",    OFFSET(amplitude),    AV_OPT_TYPE_DOUBLE,    {.dbl = 1.},        0.,  1.,         FLAGS },
    { "duration",     "set duration",     OFFSET(duration),     AV_OPT_TYPE_DURATION,  {.i64 =  0},         0,  INT64_MAX,  FLAGS },
    { "d",            "set duration",     OFFSET(duration),     AV_OPT_TYPE_DURATION,  {.i64 =  0},         0,  INT64_MAX,  FLAGS },
    { "color",        "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
    { "colour",       "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
    { "c",            "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},         0,  NM_NB - 1,  FLAGS, "color" },
    {     "white",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_WHITE},   0,  0,          FLAGS, "color" },
    {     "pink",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_PINK},    0,  0,          FLAGS, "color" },
    {     "brown",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_BROWN},   0,  0,          FLAGS, "color" },
    {     "blue",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_BLUE},    0,  0,          FLAGS, "color" },
    {     "violet",   0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_VIOLET},  0,  0,          FLAGS, "color" },
    {     "velvet",   0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 = NM_VELVET},  0,  0,          FLAGS, "color" },
    { "seed",         "set random seed",  OFFSET(seed),         AV_OPT_TYPE_INT64,     {.i64 = -1},        -1,  UINT_MAX,   FLAGS },
    { "s",            "set random seed",  OFFSET(seed),         AV_OPT_TYPE_INT64,     {.i64 = -1},        -1,  UINT_MAX,   FLAGS },
    { "nb_samples",   "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
    { "n",            "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS },
    {NULL}
}

Definition at line 59 of file asrc_anoisesrc.c.

anoisesrc_outputs

const AVFilterPad anoisesrc_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .config_props  = config_props,
    },
}

Definition at line 227 of file asrc_anoisesrc.c.

ff_asrc_anoisesrc

const AVFilter ff_asrc_anoisesrc

Initial value:

= {
    .name          = "anoisesrc",
    .description   = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."),
    .priv_size     = sizeof(ANoiseSrcContext),
    .inputs        = NULL,
    .activate      = activate,
    FILTER_OUTPUTS(anoisesrc_outputs),
    FILTER_QUERY_FUNC(query_formats),
    .priv_class    = &anoisesrc_class,
}

Definition at line 235 of file asrc_anoisesrc.c.