asrc_sine.c File Reference

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

Go to the source code of this file.

Data Structures
struct	SamplingContext
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, ...)
#define	OPT_DBL(name, field, def, min, max, descr, ...)
#define	OPT_DUR(name, field, def, min, max, descr, ...)
#define	OPT_STR(name, field, def, min, max, descr, ...)
#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 void	sampling_init (SamplingContext *c, double frequency, int sample_rate)
static av_always_inline void	sampling_advance (SamplingContext *c)
static av_cold int	init (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static av_cold int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static av_cold int	config_props (AVFilterLink *outlink)
static int	activate (AVFilterContext *ctx)

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

Macro Definition Documentation

CONTEXT

#define CONTEXT   SineContext

Definition at line 58 of file asrc_sine.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 59 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 61 of file asrc_sine.c.

OPT_INT

#define OPT_INT	(		name,
			field,
			def,
			min,
			max,
			descr,
			... )

Value:

    OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__)

Definition at line 65 of file asrc_sine.c.

OPT_DBL

#define OPT_DBL	(		name,
			field,
			def,
			min,
			max,
			descr,
			... )

Value:

    OPT_GENERIC(name, field, def, min, max, descr, DOUBLE, dbl, __VA_ARGS__)

Definition at line 68 of file asrc_sine.c.

OPT_DUR

#define OPT_DUR	(		name,
			field,
			def,
			min,
			max,
			descr,
			... )

Value:

    OPT_GENERIC(name, field, def, min, max, descr, DURATION, str, __VA_ARGS__)

Definition at line 71 of file asrc_sine.c.

OPT_STR

#define OPT_STR	(		name,
			field,
			def,
			min,
			max,
			descr,
			... )

Value:

    OPT_GENERIC(name, field, def, min, max, descr, STRING, str, __VA_ARGS__)

Definition at line 74 of file asrc_sine.c.

LOG_PERIOD

#define LOG_PERIOD   15

Definition at line 92 of file asrc_sine.c.

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

AMPLITUDE

#define AMPLITUDE   4095

Definition at line 93 of file asrc_sine.c.

Referenced by make_sin_table().

AMPLITUDE_SHIFT

#define AMPLITUDE_SHIFT   3

Definition at line 94 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 144 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 96 of file asrc_sine.c.

Referenced by init().

sampling_init()

static void sampling_init ( SamplingContext * c, double frequency, int sample_rate )

static

Definition at line 152 of file asrc_sine.c.

Referenced by init().

sampling_advance()

static av_always_inline void sampling_advance ( SamplingContext * c )

static

Definition at line 171 of file asrc_sine.c.

Referenced by activate().

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 181 of file asrc_sine.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 206 of file asrc_sine.c.

query_formats()

static av_cold int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 215 of file asrc_sine.c.

config_props()

static av_cold int config_props ( AVFilterLink * outlink )

static

Definition at line 235 of file asrc_sine.c.

activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 242 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 77 of file asrc_sine.c.

var_names

const char* const var_names[]

static

Initial value:

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

Definition at line 136 of file asrc_sine.c.

sine_outputs

const AVFilterPad sine_outputs[]

static

Initial value:

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

Definition at line 293 of file asrc_sine.c.

ff_asrc_sine

const FFFilter ff_asrc_sine

Initial value:

= {
    .p.name        = "sine",
    .p.description = NULL_IF_CONFIG_SMALL("Generate sine wave audio signal."),
    .p.priv_class  = &sine_class,
    .init          = init,
    .uninit        = uninit,
    .activate      = activate,
    .priv_size     = sizeof(SineContext),
    FILTER_OUTPUTS(sine_outputs),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 301 of file asrc_sine.c.