af_aphaser.c File Reference

phaser audio filter More...

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

Include dependency graph for af_aphaser.c:

Go to the source code of this file.

Data Structures
struct	AudioPhaserContext

Macros
#define	OFFSET(x)   offsetof(AudioPhaserContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	MOD(a, b)   (((a) >= (b)) ? (a) - (b) : (a))
#define	PHASER_PLANAR(name, type)
#define	PHASER(name, type)

Typedefs
typedef struct AudioPhaserContext	AudioPhaserContext

Enumerations
enum	WaveType { WAVE_SIN, WAVE_TRI, WAVE_NB }

Functions
	AVFILTER_DEFINE_CLASS (aphaser)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static void	generate_wave_table (enum WaveType wave_type, enum AVSampleFormat sample_fmt, void *table, int table_size, double min, double max, double phase)
static int	config_output (AVFilterLink *outlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *inbuf)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	aphaser_options []
static const AVFilterPad	aphaser_inputs []
static const AVFilterPad	aphaser_outputs []
AVFilter	avfilter_af_aphaser

Detailed Description

phaser audio filter

Definition in file af_aphaser.c.

Macro Definition Documentation

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 61 of file af_aphaser.c.

#define MOD	(		a,
			b
	)		(((a) >= (b)) ? (a) - (b) : (a))

Definition at line 180 of file af_aphaser.c.

#define OFFSET

(

x

)

offsetof(AudioPhaserContext, x)

Definition at line 60 of file af_aphaser.c.

#define PHASER	(		name,
			type
	)

Definition at line 218 of file af_aphaser.c.

#define PHASER_PLANAR	(		name,
			type
	)

Definition at line 182 of file af_aphaser.c.

Typedef Documentation

typedef struct AudioPhaserContext AudioPhaserContext

Enumeration Type Documentation

enum WaveType

Enumerator
WAVE_SIN
WAVE_TRI
WAVE_NB

Definition at line 32 of file af_aphaser.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

aphaser

)

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 264 of file af_aphaser.c.

static int filter_frame ( AVFilterLink *  inlink, AVFrame *  inbuf  )

static

Definition at line 298 of file af_aphaser.c.

static void generate_wave_table ( enum WaveType  wave_type, enum AVSampleFormat  sample_fmt, void *  table, int  table_size, double  min, double  max, double  phase  )

static

Definition at line 121 of file af_aphaser.c.

Referenced by config_output().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 79 of file af_aphaser.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 91 of file af_aphaser.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 322 of file af_aphaser.c.

Variable Documentation

const AVFilterPad aphaser_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 330 of file af_aphaser.c.

const AVOption aphaser_options[]

static

Initial value:

= {
    { "in_gain",  "set input gain",            OFFSET(in_gain),  AV_OPT_TYPE_DOUBLE, {.dbl=.4},  0,  1,   FLAGS },
    { "out_gain", "set output gain",           OFFSET(out_gain), AV_OPT_TYPE_DOUBLE, {.dbl=.74}, 0,  1e9, FLAGS },
    { "delay",    "set delay in milliseconds", OFFSET(delay),    AV_OPT_TYPE_DOUBLE, {.dbl=3.},  0,  5,   FLAGS },
    { "decay",    "set decay",                 OFFSET(decay),    AV_OPT_TYPE_DOUBLE, {.dbl=.4},  0, .99,  FLAGS },
    { "speed",    "set modulation speed",      OFFSET(speed),    AV_OPT_TYPE_DOUBLE, {.dbl=.5}, .1,  2,   FLAGS },
    { "type",     "set modulation type",       OFFSET(type),     AV_OPT_TYPE_INT,    {.i64=WAVE_TRI}, 0, WAVE_NB-1, FLAGS, "type" },
    { "triangular",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_TRI}, 0, 0, FLAGS, "type" },
    { "t",           NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_TRI}, 0, 0, FLAGS, "type" },
    { "sinusoidal",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_SIN}, 0, 0, FLAGS, "type" },
    { "s",           NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_SIN}, 0, 0, FLAGS, "type" },
    { NULL },
}

Definition at line 63 of file af_aphaser.c.

const AVFilterPad aphaser_outputs[]

static

Initial value:

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

Definition at line 339 of file af_aphaser.c.

AVFilter avfilter_af_aphaser

Initial value:

= {
    .name          = "aphaser",
    .description   = NULL_IF_CONFIG_SMALL("Add a phasing effect to the audio."),
    .query_formats = query_formats,
    .priv_size     = sizeof(AudioPhaserContext),
    .init          = init,
    .uninit        = uninit,
    .inputs        = aphaser_inputs,
    .outputs       = aphaser_outputs,
    .priv_class    = &aphaser_class,
}

Definition at line 348 of file af_aphaser.c.