FFmpeg
Data Structures | Macros | Functions | Variables
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"

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 int query_formats (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 []
 
AVFilter ff_af_mcompand
 

Detailed Description

audio multiband compand filter

Definition in file af_mcompand.c.

Macro Definition Documentation

#define N   4
#define OFFSET (   x)    offsetof(MCompandContext, x)

Definition at line 94 of file af_mcompand.c.

Definition at line 95 of file af_mcompand.c.

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

Referenced by parse_points().

#define S (   x)    s->segments[2 * (x)]
#define L (   x)    s->segments[i - (x)]

Referenced by parse_points().

#define CONVOLVE   _ _ _ _

Definition at line 494 of file af_mcompand.c.

Referenced by crossover().

#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++;
#define N
Definition: af_mcompand.c:54
#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++;
#define N
Definition: af_mcompand.c:54

Function Documentation

AVFILTER_DEFINE_CLASS ( mcompand  )
static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 104 of file af_mcompand.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 126 of file af_mcompand.c.

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

Definition at line 156 of file af_mcompand.c.

Referenced by config_output().

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

Definition at line 167 of file af_mcompand.c.

Referenced by mcompand_channel().

static double get_volume ( CompandT s,
double  in_lin 
)
static

Definition at line 177 of file af_mcompand.c.

Referenced by mcompand_channel().

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

Definition at line 198 of file af_mcompand.c.

Referenced by config_output().

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

Definition at line 300 of file af_mcompand.c.

Referenced by crossover_setup().

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

Definition at line 309 of file af_mcompand.c.

Referenced by config_output().

static int config_output ( AVFilterLink outlink)
static

Definition at line 343 of file af_mcompand.c.

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

Definition at line 496 of file af_mcompand.c.

Referenced by filter_frame().

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

Definition at line 527 of file af_mcompand.c.

Referenced by filter_frame().

static int filter_frame ( AVFilterLink inlink,
AVFrame in 
)
static

Definition at line 580 of file af_mcompand.c.

static int request_frame ( AVFilterLink outlink)
static

Definition at line 636 of file af_mcompand.c.

Variable Documentation

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 }
}
#define NULL
Definition: coverity.c:32
#define OFFSET(x)
Definition: af_mcompand.c:94
#define A
Definition: af_mcompand.c:95

Definition at line 97 of file af_mcompand.c.

const AVFilterPad mcompand_inputs[]
static
Initial value:
= {
{
.name = "default",
.filter_frame = filter_frame,
},
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_mcompand.c:580

Definition at line 646 of file af_mcompand.c.

const AVFilterPad mcompand_outputs[]
static
Initial value:
= {
{
.name = "default",
.request_frame = request_frame,
.config_props = config_output,
},
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int config_output(AVFilterLink *outlink)
Definition: af_mcompand.c:343
static int request_frame(AVFilterLink *outlink)
Definition: af_mcompand.c:636

Definition at line 655 of file af_mcompand.c.

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,
}
static int query_formats(AVFilterContext *ctx)
Definition: af_mcompand.c:126
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static const AVFilterPad mcompand_outputs[]
Definition: af_mcompand.c:655
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_mcompand.c:104
static const AVFilterPad mcompand_inputs[]
Definition: af_mcompand.c:646

Definition at line 666 of file af_mcompand.c.