af_mcompand.c File Reference

audio multiband compand filter More...

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

Classes
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	_

Typedefs
typedef struct CompandSegment	CompandSegment
typedef struct CompandT	CompandT
typedef struct PrevCrossover	PrevCrossover[N *2]
typedef struct Crossover	Crossover
typedef struct CompBand	CompBand
typedef struct MCompandContext	MCompandContext

Functions
	AVFILTER_DEFINE_CLASS (mcompand)

Variables
AVFilter	ff_af_mcompand

Detailed Description

audio multiband compand filter

Macro Definition Documentation

_ [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++;

Variable Documentation

ff_af_mcompand

AVFilter ff_af_mcompand

Initial value:

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