asrc_sine.c File Reference

#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	SineContext

Macros
#define	CONTEXT   SineContext
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...)
#define	OPT_INT(name, field, def, min, max, descr, ...)   OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__)
#define	OPT_DBL(name, field, def, min, max, descr, ...)   OPT_GENERIC(name, field, def, min, max, descr, DOUBLE, dbl, __VA_ARGS__)
#define	OPT_DUR(name, field, def, min, max, descr, ...)   OPT_GENERIC(name, field, def, min, max, descr, DURATION, str, __VA_ARGS__)
#define	OPT_STR(name, field, def, min, max, descr, ...)   OPT_GENERIC(name, field, def, min, max, descr, STRING, str, __VA_ARGS__)
#define	LOG_PERIOD   15
#define	AMPLITUDE   4095
#define	AMPLITUDE_SHIFT   3

Enumerations
enum	{   VAR_N, VAR_PTS, VAR_T, VAR_TB,   VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (sine)
static void	make_sin_table (int16_t *sin)
static av_cold int	init (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static av_cold int	query_formats (AVFilterContext *ctx)
static av_cold int	config_props (AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)

Variables
static const AVOption	sine_options []
static const char *const	var_names []
static const AVFilterPad	sine_outputs []
AVFilter	ff_asrc_sine

Macro Definition Documentation

CONTEXT

#define CONTEXT   SineContext

Definition at line 50 of file asrc_sine.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 51 of file asrc_sine.c.

OPT_GENERIC

#define OPT_GENERIC	(		name,
			field,
			def,
			min,
			max,
			descr,
			type,
			deffield,
			...
	)

Value:

{ name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type,          \
      { .deffield = def }, min, max, FLAGS, __VA_ARGS__ }

Definition at line 53 of file asrc_sine.c.

OPT_INT

#define OPT_INT	(		name,
			field,
			def,
			min,
			max,
			descr,
			...
	)		OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__)

Definition at line 57 of file asrc_sine.c.

OPT_DBL

#define OPT_DBL	(		name,
			field,
			def,
			min,
			max,
			descr,
			...
	)		OPT_GENERIC(name, field, def, min, max, descr, DOUBLE, dbl, __VA_ARGS__)

Definition at line 60 of file asrc_sine.c.

OPT_DUR

#define OPT_DUR	(		name,
			field,
			def,
			min,
			max,
			descr,
			...
	)		OPT_GENERIC(name, field, def, min, max, descr, DURATION, str, __VA_ARGS__)

Definition at line 63 of file asrc_sine.c.

OPT_STR

#define OPT_STR	(		name,
			field,
			def,
			min,
			max,
			descr,
			...
	)		OPT_GENERIC(name, field, def, min, max, descr, STRING, str, __VA_ARGS__)

Definition at line 66 of file asrc_sine.c.

LOG_PERIOD

#define LOG_PERIOD   15

Definition at line 84 of file asrc_sine.c.

Referenced by init(), make_sin_table(), and request_frame().

AMPLITUDE

#define AMPLITUDE   4095

Definition at line 85 of file asrc_sine.c.

Referenced by make_sin_table().

AMPLITUDE_SHIFT

#define AMPLITUDE_SHIFT   3

Definition at line 86 of file asrc_sine.c.

Referenced by make_sin_table().

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
VAR_N
VAR_PTS
VAR_T
VAR_TB
VAR_VARS_NB

Definition at line 136 of file asrc_sine.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

sine

)

make_sin_table()

static void make_sin_table ( int16_t *  sin )

static

Definition at line 88 of file asrc_sine.c.

Referenced by init().

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 144 of file asrc_sine.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 170 of file asrc_sine.c.

query_formats()

static av_cold int query_formats ( AVFilterContext *  ctx )

static

Definition at line 179 of file asrc_sine.c.

config_props()

static av_cold int config_props ( AVFilterLink *  outlink )

static

Definition at line 210 of file asrc_sine.c.

request_frame()

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 217 of file asrc_sine.c.

Variable Documentation

sine_options

const AVOption sine_options[]

static

Initial value:

= {
    OPT_DBL("frequency",         frequency,            440, 0, DBL_MAX,   "set the sine frequency",),
    OPT_DBL("f",                 frequency,            440, 0, DBL_MAX,   "set the sine frequency",),
    OPT_DBL("beep_factor",       beep_factor,            0, 0, DBL_MAX,   "set the beep frequency factor",),
    OPT_DBL("b",                 beep_factor,            0, 0, DBL_MAX,   "set the beep frequency factor",),
    OPT_INT("sample_rate",       sample_rate,        44100, 1, INT_MAX,   "set the sample rate",),
    OPT_INT("r",                 sample_rate,        44100, 1, INT_MAX,   "set the sample rate",),
    OPT_DUR("duration",          duration,               0, 0, INT64_MAX, "set the audio duration",),
    OPT_DUR("d",                 duration,               0, 0, INT64_MAX, "set the audio duration",),
    OPT_STR("samples_per_frame", samples_per_frame, "1024", 0, 0,         "set the number of samples per frame",),
    {NULL}
}

Definition at line 69 of file asrc_sine.c.

var_names

const char* const var_names[]

static

Initial value:

= {
    "n",
    "pts",
    "t",
    "TB",
    NULL
}

Definition at line 128 of file asrc_sine.c.

Referenced by init().

sine_outputs

const AVFilterPad sine_outputs[]

static

Initial value:

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

Definition at line 262 of file asrc_sine.c.

ff_asrc_sine

AVFilter ff_asrc_sine

Initial value:

= {
    .name          = "sine",
    .description   = NULL_IF_CONFIG_SMALL("Generate sine wave audio signal."),
    .query_formats = query_formats,
    .init          = init,
    .uninit        = uninit,
    .priv_size     = sizeof(SineContext),
    .inputs        = NULL,
    .outputs       = sine_outputs,
    .priv_class    = &sine_class,
}

Definition at line 272 of file asrc_sine.c.