af_aecho.c File Reference

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

Go to the source code of this file.

Data Structures
struct	AudioEchoContext

Macros
#define	OFFSET(x)   offsetof(AudioEchoContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	MOD(a, b)   (((a) >= (b)) ? (a) - (b) : (a))
#define	ECHO(name, type, min, max)

Functions
	AVFILTER_DEFINE_CLASS (aecho)
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 void	uninit (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
static int	request_frame (AVFilterLink *outlink)
static int	activate (AVFilterContext *ctx)

Variables
static const AVOption	aecho_options []
static const AVFilterPad	aecho_outputs []
const AVFilter	ff_af_aecho

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(AudioEchoContext, x)

Definition at line 48 of file af_aecho.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 49 of file af_aecho.c.

MOD

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

Definition at line 155 of file af_aecho.c.

ECHO

#define ECHO	(		name,
			type,
			min,
			max
	)

Definition at line 157 of file af_aecho.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

aecho

)

count_items()

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

static

Definition at line 61 of file af_aecho.c.

Referenced by init().

fill_items()

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

static

Definition at line 73 of file af_aecho.c.

Referenced by init().

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 89 of file af_aecho.c.

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 102 of file af_aecho.c.

config_output()

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 203 of file af_aecho.c.

filter_frame()

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

static

Definition at line 244 of file af_aecho.c.

Referenced by activate().

request_frame()

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 272 of file af_aecho.c.

Referenced by activate(), and ff_request_frame().

activate()

static int activate ( AVFilterContext *  ctx )

static

Definition at line 298 of file af_aecho.c.

Variable Documentation

aecho_options

const AVOption aecho_options[]

static

Initial value:

= {
    { "in_gain",  "set signal input gain",  OFFSET(in_gain),  AV_OPT_TYPE_FLOAT,  {.dbl=0.6}, 0, 1, A },
    { "out_gain", "set signal output gain", OFFSET(out_gain), AV_OPT_TYPE_FLOAT,  {.dbl=0.3}, 0, 1, A },
    { "delays",   "set list of signal delays", OFFSET(delays), AV_OPT_TYPE_STRING, {.str="1000"}, 0, 0, A },
    { "decays",   "set list of signal decays", OFFSET(decays), AV_OPT_TYPE_STRING, {.str="0.5"}, 0, 0, A },
    { NULL }
}

Definition at line 51 of file af_aecho.c.

aecho_outputs

const AVFilterPad aecho_outputs[]

static

Initial value:

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

Definition at line 331 of file af_aecho.c.

ff_af_aecho

const AVFilter ff_af_aecho

Initial value:

= {
    .name          = "aecho",
    .description   = NULL_IF_CONFIG_SMALL("Add echoing to the audio."),
    .priv_size     = sizeof(AudioEchoContext),
    .priv_class    = &aecho_class,
    .init          = init,
    .activate      = activate,
    .uninit        = uninit,
    FILTER_INPUTS(ff_audio_default_filterpad),
    FILTER_OUTPUTS(aecho_outputs),
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P,
                      AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
}

Definition at line 339 of file af_aecho.c.