FFmpeg  4.0
Data Structures | Macros | Functions | Variables
af_pan.c File Reference

Audio panning filter (channels mixing) Original code written by Anders Johansson for MPlayer, reimplemented for FFmpeg. More...

#include <stdio.h>
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libswresample/swresample.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures

struct  PanContext
 

Macros

#define MAX_CHANNELS   64
 
#define OFFSET(x)   offsetof(PanContext, x)
 

Functions

static void skip_spaces (char **arg)
 
static int parse_channel_name (char **arg, int *rchannel, int *rnamed)
 
static av_cold int init (AVFilterContext *ctx)
 
static int are_gains_pure (const PanContext *pan)
 
static int query_formats (AVFilterContext *ctx)
 
static int config_props (AVFilterLink *link)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *insamples)
 
static av_cold void uninit (AVFilterContext *ctx)
 
 AVFILTER_DEFINE_CLASS (pan)
 

Variables

static const AVOption pan_options []
 
static const AVFilterPad pan_inputs []
 
static const AVFilterPad pan_outputs []
 
AVFilter ff_af_pan
 

Detailed Description

Audio panning filter (channels mixing) Original code written by Anders Johansson for MPlayer, reimplemented for FFmpeg.

Definition in file af_pan.c.

Macro Definition Documentation

◆ MAX_CHANNELS

#define MAX_CHANNELS   64

Definition at line 40 of file af_pan.c.

Referenced by are_gains_pure(), config_props(), init(), and parse_channel_name().

◆ OFFSET

#define OFFSET (   x)    offsetof(PanContext, x)

Definition at line 424 of file af_pan.c.

Function Documentation

◆ skip_spaces()

static void skip_spaces ( char **  arg)
static

Definition at line 57 of file af_pan.c.

Referenced by init(), and parse_channel_name().

◆ parse_channel_name()

static int parse_channel_name ( char **  arg,
int rchannel,
int rnamed 
)
static

Definition at line 65 of file af_pan.c.

Referenced by init().

◆ init()

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 101 of file af_pan.c.

◆ are_gains_pure()

static int are_gains_pure ( const PanContext pan)
static

Definition at line 227 of file af_pan.c.

Referenced by query_formats().

◆ query_formats()

static int query_formats ( AVFilterContext ctx)
static

Definition at line 249 of file af_pan.c.

◆ config_props()

static int config_props ( AVFilterLink link)
static

Definition at line 281 of file af_pan.c.

◆ filter_frame()

static int filter_frame ( AVFilterLink inlink,
AVFrame insamples 
)
static

Definition at line 395 of file af_pan.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 418 of file af_pan.c.

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( pan  )

Variable Documentation

◆ pan_options

const AVOption pan_options[]
static
Initial value:
= {
{ "args", NULL, OFFSET(args), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
{ NULL }
}
#define NULL
Definition: coverity.c:32
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:278
#define AV_OPT_FLAG_FILTERING_PARAM
a generic parameter which can be set by the user for filtering
Definition: opt.h:291
const char AVS_Value args
Definition: avisynth_c.h:780
#define OFFSET(x)
Definition: af_pan.c:424

Definition at line 426 of file af_pan.c.

◆ pan_inputs

const AVFilterPad pan_inputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_props,
.filter_frame = filter_frame,
},
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int config_props(AVFilterLink *link)
Definition: af_pan.c:281
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
Definition: af_pan.c:395

Definition at line 433 of file af_pan.c.

◆ pan_outputs

const AVFilterPad pan_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}
#define NULL
Definition: coverity.c:32

Definition at line 443 of file af_pan.c.

◆ ff_af_pan

AVFilter ff_af_pan
Initial value:
= {
.name = "pan",
.description = NULL_IF_CONFIG_SMALL("Remix channels with coefficients (panning)."),
.priv_size = sizeof(PanContext),
.priv_class = &pan_class,
.init = init,
}
static const AVFilterPad pan_inputs[]
Definition: af_pan.c:433
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static int query_formats(AVFilterContext *ctx)
Definition: af_pan.c:249
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static av_cold int init(AVFilterContext *ctx)
Definition: af_pan.c:101
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_pan.c:418
static const AVFilterPad pan_outputs[]
Definition: af_pan.c:443

Definition at line 451 of file af_pan.c.