af_afir.c File Reference

An arbitrary audio FIR filter. More...

#include "libavutil/audio_fifo.h"
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/opt.h"
#include "libavcodec/avfft.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "af_afir.h"

Go to the source code of this file.

Macros
#define	AF   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	OFFSET(x)   offsetof(AudioFIRContext, x)

Functions
static void	fcmul_add_c (float *sum, const float *t, const float *c, ptrdiff_t len)
static int	fir_channel (AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
static int	fir_frame (AudioFIRContext *s, AVFilterLink *outlink)
static int	convert_coeffs (AVFilterContext *ctx)
static int	read_ir (AVFilterLink *link, AVFrame *frame)
static int	filter_frame (AVFilterLink *link, AVFrame *frame)
static int	request_frame (AVFilterLink *outlink)
static int	query_formats (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static av_cold void	uninit (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx)
	AVFILTER_DEFINE_CLASS (afir)

Variables
static const AVFilterPad	afir_inputs []
static const AVFilterPad	afir_outputs []
static const AVOption	afir_options []
AVFilter	ff_af_afir

Detailed Description

An arbitrary audio FIR filter.

Definition in file af_afir.c.

Macro Definition Documentation

AF

#define AF   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 532 of file af_afir.c.

OFFSET

#define OFFSET

(

x

)

offsetof(AudioFIRContext, x)

Definition at line 533 of file af_afir.c.

Function Documentation

fcmul_add_c()

static void fcmul_add_c ( float *  sum, const float *  t, const float *  c, ptrdiff_t  len  )

static

Definition at line 38 of file af_afir.c.

Referenced by init().

fir_channel()

static int fir_channel ( AVFilterContext *  ctx, void *  arg, int  ch, int  nb_jobs  )

static

Definition at line 55 of file af_afir.c.

Referenced by fir_frame().

fir_frame()

static int fir_frame ( AudioFIRContext *  s, AVFilterLink *  outlink  )

static

Definition at line 115 of file af_afir.c.

Referenced by filter_frame(), and request_frame().

convert_coeffs()

static int convert_coeffs ( AVFilterContext *  ctx )

static

Definition at line 165 of file af_afir.c.

Referenced by filter_frame().

read_ir()

static int read_ir ( AVFilterLink *  link, AVFrame *  frame  )

static

Definition at line 280 of file af_afir.c.

filter_frame()

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

static

Definition at line 302 of file af_afir.c.

request_frame()

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 335 of file af_afir.c.

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 374 of file af_afir.c.

config_output()

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 402 of file af_afir.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 443 of file af_afir.c.

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 493 of file af_afir.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

afir

)

Variable Documentation

afir_inputs

const AVFilterPad afir_inputs[]

static

Initial value:

= {
    {
        .name           = "main",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = filter_frame,
    },{
        .name           = "ir",
        .type           = AVMEDIA_TYPE_AUDIO,
        .filter_frame   = read_ir,
    },
    { NULL }
}

Definition at line 509 of file af_afir.c.

afir_outputs

const AVFilterPad afir_outputs[]

static

Initial value:

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

Definition at line 522 of file af_afir.c.

afir_options

const AVOption afir_options[]

static

Initial value:

= {
    { "dry",    "set dry gain",     OFFSET(dry_gain), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, AF },
    { "wet",    "set wet gain",     OFFSET(wet_gain), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, AF },
    { "length", "set IR length",    OFFSET(length),   AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, AF },
    { "again",  "enable auto gain", OFFSET(again),    AV_OPT_TYPE_BOOL,  {.i64=1}, 0, 1, AF },
    { NULL }
}

Definition at line 535 of file af_afir.c.

ff_af_afir

AVFilter ff_af_afir

Initial value:

= {
    .name          = "afir",
    .description   = NULL_IF_CONFIG_SMALL("Apply Finite Impulse Response filter with supplied coefficients in 2nd stream."),
    .priv_size     = sizeof(AudioFIRContext),
    .priv_class    = &afir_class,
    .query_formats = query_formats,
    .init          = init,
    .uninit        = uninit,
    .inputs        = afir_inputs,
    .outputs       = afir_outputs,
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 545 of file af_afir.c.