af_flanger.c File Reference

#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "avfilter.h"
#include "audio.h"
#include "internal.h"
#include "generate_wave_table.h"

Go to the source code of this file.

Data Structures
struct	FlangerContext

Macros
#define	INTERPOLATION_LINEAR   0
#define	INTERPOLATION_QUADRATIC   1
#define	OFFSET(x)   offsetof(FlangerContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (flanger)
static int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	flanger_options []
static const AVFilterPad	flanger_inputs []
static const AVFilterPad	flanger_outputs []
AVFilter	ff_af_flanger

Macro Definition Documentation

#define INTERPOLATION_LINEAR   0

Definition at line 29 of file af_flanger.c.

Referenced by filter_frame().

#define INTERPOLATION_QUADRATIC   1

Definition at line 30 of file af_flanger.c.

#define OFFSET

(

x

)

offsetof(FlangerContext, x)

Definition at line 52 of file af_flanger.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 53 of file af_flanger.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

flanger

)

static int init ( AVFilterContext *  ctx )

static

Definition at line 75 of file af_flanger.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 91 of file af_flanger.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 117 of file af_flanger.c.

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

static

Definition at line 138 of file af_flanger.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 201 of file af_flanger.c.

Variable Documentation

const AVOption flanger_options[]

static

Initial value:

= {
    { "delay", "base delay in milliseconds",        OFFSET(delay_min),   AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 30, A },
    { "depth", "added swept delay in milliseconds", OFFSET(delay_depth), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, 10, A },
    { "regen", "percentage regeneration (delayed signal feedback)", OFFSET(feedback_gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -95, 95, A },
    { "width", "percentage of delayed signal mixed with original", OFFSET(delay_gain), AV_OPT_TYPE_DOUBLE, {.dbl=71}, 0, 100, A },
    { "speed", "sweeps per second (Hz)", OFFSET(speed), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.1, 10, A },
    { "shape", "swept wave shape", OFFSET(wave_shape), AV_OPT_TYPE_INT, {.i64=WAVE_SIN}, WAVE_SIN, WAVE_NB-1, A, "type" },
    { "triangular",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_TRI}, 0, 0, A, "type" },
    { "t",           NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_TRI}, 0, 0, A, "type" },
    { "sinusoidal",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_SIN}, 0, 0, A, "type" },
    { "s",           NULL, 0, AV_OPT_TYPE_CONST,  {.i64=WAVE_SIN}, 0, 0, A, "type" },
    { "phase", "swept wave percentage phase-shift for multi-channel", OFFSET(channel_phase), AV_OPT_TYPE_DOUBLE, {.dbl=25}, 0, 100, A },
    { "interp", "delay-line interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A, "itype" },
    { "linear",     NULL, 0, AV_OPT_TYPE_CONST,  {.i64=INTERPOLATION_LINEAR},    0, 0, A, "itype" },
    { "quadratic",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64=INTERPOLATION_QUADRATIC}, 0, 0, A, "itype" },
    { NULL }
}

Definition at line 55 of file af_flanger.c.

const AVFilterPad flanger_inputs[]

static

Initial value:

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

Definition at line 213 of file af_flanger.c.

const AVFilterPad flanger_outputs[]

static

Initial value:

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

Definition at line 223 of file af_flanger.c.

AVFilter ff_af_flanger

Initial value:

= {
    .name          = "flanger",
    .description   = NULL_IF_CONFIG_SMALL("Apply a flanging effect to the audio."),
    .query_formats = query_formats,
    .priv_size     = sizeof(FlangerContext),
    .priv_class    = &flanger_class,
    .init          = init,
    .uninit        = uninit,
    .inputs        = flanger_inputs,
    .outputs       = flanger_outputs,
}

Definition at line 231 of file af_flanger.c.