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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.

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",
.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),
.priv_class = &sine_class,
}

Definition at line 213 of file asrc_sine.c.