af_chorus.c File Reference

chorus audio filter More...

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

Go to the source code of this file.

Data Structures
struct	ChorusContext

Macros
#define	OFFSET(x)   offsetof(ChorusContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	MOD(a, b)   (((a) >= (b)) ? (a) - (b) : (a))

Functions
	AVFILTER_DEFINE_CLASS (chorus)
static void	count_items (char *item_str, int *nb_items)
static void	fill_items (char *item_str, int *nb_items, float *items)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
static int	request_frame (AVFilterLink *outlink)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	chorus_options []
static const AVFilterPad	chorus_inputs []
static const AVFilterPad	chorus_outputs []
AVFilter	ff_af_chorus

Detailed Description

chorus audio filter

Definition in file af_chorus.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ChorusContext, x)

Definition at line 63 of file af_chorus.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 64 of file af_chorus.c.

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

Definition at line 237 of file af_chorus.c.

Referenced by filter_frame().

Function Documentation

AVFILTER_DEFINE_CLASS

(

chorus

)

static void count_items ( char *  item_str, int *  nb_items  )

static

Definition at line 78 of file af_chorus.c.

Referenced by init().

static void fill_items ( char *  item_str, int *  nb_items, float *  items  )

static

Definition at line 90 of file af_chorus.c.

Referenced by init().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 105 of file af_chorus.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 156 of file af_chorus.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 185 of file af_chorus.c.

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

static

Definition at line 239 of file af_chorus.c.

Referenced by request_frame().

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 292 of file af_chorus.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 324 of file af_chorus.c.

Variable Documentation

const AVOption chorus_options[]

static

Initial value:

= {
    { "in_gain",  "set input gain",  OFFSET(in_gain),    AV_OPT_TYPE_FLOAT,  {.dbl=.4}, 0, 1, A },
    { "out_gain", "set output gain", OFFSET(out_gain),   AV_OPT_TYPE_FLOAT,  {.dbl=.4}, 0, 1, A },
    { "delays",   "set delays",      OFFSET(delays_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
    { "decays",   "set decays",      OFFSET(decays_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
    { "speeds",   "set speeds",      OFFSET(speeds_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
    { "depths",   "set depths",      OFFSET(depths_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
    { NULL }
}

Definition at line 66 of file af_chorus.c.

const AVFilterPad chorus_inputs[]

static

Initial value:

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

Definition at line 352 of file af_chorus.c.

const AVFilterPad chorus_outputs[]

static

Initial value:

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

Definition at line 361 of file af_chorus.c.

AVFilter ff_af_chorus

Initial value:

= {
    .name          = "chorus",
    .description   = NULL_IF_CONFIG_SMALL("Add a chorus effect to the audio."),
    .query_formats = query_formats,
    .priv_size     = sizeof(ChorusContext),
    .priv_class    = &chorus_class,
    .init          = init,
    .uninit        = uninit,
    .inputs        = chorus_inputs,
    .outputs       = chorus_outputs,
}

Definition at line 371 of file af_chorus.c.