asrc_sine.c File Reference

#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.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	LOG_PERIOD   15
#define	AMPLITUDE   4095
#define	AMPLITUDE_SHIFT   3

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 AVFilterPad	sine_outputs []
AVFilter	ff_asrc_sine

Macro Definition Documentation

#define CONTEXT   SineContext

Definition at line 48 of file asrc_sine.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 49 of file asrc_sine.c.

#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 51 of file asrc_sine.c.

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

Definition at line 55 of file asrc_sine.c.

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

Definition at line 58 of file asrc_sine.c.

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

Definition at line 61 of file asrc_sine.c.

#define LOG_PERIOD   15

Definition at line 79 of file asrc_sine.c.

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

#define AMPLITUDE   4095

Definition at line 80 of file asrc_sine.c.

Referenced by make_sin_table().

#define AMPLITUDE_SHIFT   3

Definition at line 81 of file asrc_sine.c.

Referenced by make_sin_table().

Function Documentation

AVFILTER_DEFINE_CLASS

(

sine

)

static void make_sin_table ( int16_t *  sin )

static

Definition at line 83 of file asrc_sine.c.

Referenced by init().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 123 of file asrc_sine.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 142 of file asrc_sine.c.

static av_cold int query_formats ( AVFilterContext *  ctx )

static

Definition at line 149 of file asrc_sine.c.

static av_cold int config_props ( AVFilterLink *  outlink )

static

Definition at line 163 of file asrc_sine.c.

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 170 of file asrc_sine.c.

Variable Documentation

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 fequency factor"),
    OPT_DBL("b",                 beep_factor,            0, 0, DBL_MAX,   "set the beep fequency 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_INT("samples_per_frame", samples_per_frame,   1024, 0, INT_MAX,   "set the number of samples per frame"),
    {NULL}
}

Definition at line 64 of file asrc_sine.c.

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 203 of file asrc_sine.c.

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 213 of file asrc_sine.c.