asrc_anoisesrc.c File Reference

#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.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

Functions
	AVFILTER_DEFINE_CLASS (anoisesrc)
static av_cold int	query_formats (AVFilterContext *ctx)
static double	white_filter (double white, double *buf)
static double	pink_filter (double white, double *buf)
static double	brown_filter (double white, double *buf)
static av_cold int	config_props (AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)

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

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ANoiseSrcContext, x)

Definition at line 44 of file asrc_anoisesrc.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 45 of file asrc_anoisesrc.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

anoisesrc

)

static av_cold int query_formats ( AVFilterContext *  ctx )

static

Definition at line 69 of file asrc_anoisesrc.c.

static double white_filter ( double  white, double *  buf  )

static

Definition at line 103 of file asrc_anoisesrc.c.

Referenced by config_props().

static double pink_filter ( double  white, double *  buf  )

static

Definition at line 108 of file asrc_anoisesrc.c.

Referenced by config_props().

static double brown_filter ( double  white, double *  buf  )

static

Definition at line 124 of file asrc_anoisesrc.c.

Referenced by config_props().

static av_cold int config_props ( AVFilterLink *  outlink )

static

Definition at line 133 of file asrc_anoisesrc.c.

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 155 of file asrc_anoisesrc.c.

Variable Documentation

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 =  1},      0,  2,          FLAGS, "color" },
    { "colour",       "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  1},      0,  2,          FLAGS, "color" },
    { "c",            "set noise color",  OFFSET(color),        AV_OPT_TYPE_INT,       {.i64 =  0},      0,  2,          FLAGS, "color" },
    {     "white",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 =  0},      0,  0,          FLAGS, "color" },
    {     "pink",     0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 =  1},      0,  0,          FLAGS, "color" },
    {     "brown",    0,                  0,                    AV_OPT_TYPE_CONST,     {.i64 =  2},      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 47 of file asrc_anoisesrc.c.

const AVFilterPad anoisesrc_outputs[]

static

Initial value:

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

Definition at line 189 of file asrc_anoisesrc.c.

AVFilter ff_asrc_anoisesrc

Initial value:

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

Definition at line 199 of file asrc_anoisesrc.c.