af_mcompand.c File Reference

#include "libavutil/avstring.h"
#include "libavutil/ffmath.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"

Go to the source code of this file.

Data Structures
struct	CompandSegment
struct	CompandT
struct	PrevCrossover
struct	Crossover
struct	CompBand
struct	MCompandContext

Macros
#define	N   4
#define	OFFSET(x)   offsetof(MCompandContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	S(x)   s->segments[2 * ((x) + 1)]
#define	S(x)   s->segments[2 * (x)]
#define	L(x)   s->segments[i - (x)]
#define	CONVOLVE   _ _ _ _
#define	_
#define	_

Functions
	AVFILTER_DEFINE_CLASS (mcompand)
static av_cold void	uninit (AVFilterContext *ctx)
static void	count_items (char *item_str, int *nb_items, char delimiter)
static void	update_volume (CompBand *cb, double in, int ch)
static double	get_volume (CompandT *s, double in_lin)
static int	parse_points (char *points, int nb_points, double radius, CompandT *s, AVFilterContext *ctx)
static void	square_quadratic (double const *x, double *y)
static int	crossover_setup (AVFilterLink *outlink, Crossover *p, double frequency)
static int	config_output (AVFilterLink *outlink)
static void	crossover (int ch, Crossover *p, double *ibuf, double *obuf_low, double *obuf_high, size_t len)
static int	mcompand_channel (MCompandContext *c, CompBand *l, double *ibuf, double *obuf, int len, int ch)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	request_frame (AVFilterLink *outlink)

Variables
static const AVOption	mcompand_options []
static const AVFilterPad	mcompand_inputs []
static const AVFilterPad	mcompand_outputs []
const AVFilter	ff_af_mcompand

Detailed Description

audio multiband compand filter

Definition in file af_mcompand.c.

Macro Definition Documentation

N

#define N   4

Definition at line 54 of file af_mcompand.c.

OFFSET

#define OFFSET

(

x

)

offsetof(MCompandContext, x)

Definition at line 94 of file af_mcompand.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 95 of file af_mcompand.c.

S [1/2]

#define S

(

x

)

s->segments[2 * ((x) + 1)]

S [2/2]

#define S

(

x

)

s->segments[2 * (x)]

L

#define L

(

x

)

s->segments[i - (x)]

CONVOLVE

#define CONVOLVE   _ _ _ _

Definition at line 467 of file af_mcompand.c.

_ [1/2]

#define _

Value:

            out_low += p->coefs[j] * p->previous[ch][p->pos + j].in \
            - p->coefs[2*N+2 + j] * p->previous[ch][p->pos + j].out_low, j++;

_ [2/2]

#define _

Value:

            out_high += p->coefs[j+N+1] * p->previous[ch][p->pos + j].in \
            - p->coefs[2*N+2 + j] * p->previous[ch][p->pos + j].out_high, j++;

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

mcompand

)

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 104 of file af_mcompand.c.

count_items()

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

static

Definition at line 126 of file af_mcompand.c.

Referenced by config_output().

update_volume()

static void update_volume ( CompBand *  cb, double  in, int  ch  )

static

Definition at line 137 of file af_mcompand.c.

Referenced by mcompand_channel().

get_volume()

static double get_volume ( CompandT *  s, double  in_lin  )

static

Definition at line 147 of file af_mcompand.c.

Referenced by mcompand_channel().

parse_points()

static int parse_points ( char *  points, int  nb_points, double  radius, CompandT *  s, AVFilterContext *  ctx  )

static

Definition at line 168 of file af_mcompand.c.

Referenced by config_output().

square_quadratic()

static void square_quadratic ( double const *  x, double *  y  )

static

Definition at line 270 of file af_mcompand.c.

Referenced by crossover_setup().

crossover_setup()

static int crossover_setup ( AVFilterLink *  outlink, Crossover *  p, double  frequency  )

static

Definition at line 279 of file af_mcompand.c.

Referenced by config_output().

config_output()

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 313 of file af_mcompand.c.

crossover()

static void crossover ( int  ch, Crossover *  p, double *  ibuf, double *  obuf_low, double *  obuf_high, size_t  len  )

static

Definition at line 469 of file af_mcompand.c.

Referenced by filter_frame().

mcompand_channel()

static int mcompand_channel ( MCompandContext *  c, CompBand *  l, double *  ibuf, double *  obuf, int  len, int  ch  )

static

Definition at line 500 of file af_mcompand.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 553 of file af_mcompand.c.

request_frame()

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 609 of file af_mcompand.c.

Variable Documentation

mcompand_options

const AVOption mcompand_options[]

static

Initial value:

= {
    { "args", "set parameters for each band", OFFSET(args), AV_OPT_TYPE_STRING, { .str = "0.005,0.1 6 -47/-40,-34/-34,-17/-33 100 | 0.003,0.05 6 -47/-40,-34/-34,-17/-33 400 | 0.000625,0.0125 6 -47/-40,-34/-34,-15/-33 1600 | 0.0001,0.025 6 -47/-40,-34/-34,-31/-31,-0/-30 6400 | 0,0.025 6 -38/-31,-28/-28,-0/-25 22000" }, 0, 0, A },
    { NULL }
}

Definition at line 97 of file af_mcompand.c.

mcompand_inputs

const AVFilterPad mcompand_inputs[]

static

Initial value:

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

Definition at line 619 of file af_mcompand.c.

mcompand_outputs

const AVFilterPad mcompand_outputs[]

static

Initial value:

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

Definition at line 627 of file af_mcompand.c.

ff_af_mcompand

const AVFilter ff_af_mcompand

Initial value:

= {
    .name           = "mcompand",
    .description    = NULL_IF_CONFIG_SMALL(
            "Multiband Compress or expand audio dynamic range."),
    .priv_size      = sizeof(MCompandContext),
    .priv_class     = &mcompand_class,
    .uninit         = uninit,
    FILTER_INPUTS(mcompand_inputs),
    FILTER_OUTPUTS(mcompand_outputs),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
}

Definition at line 637 of file af_mcompand.c.