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

#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().

#define OFFSET

(

x

)

offsetof(PanContext, x)

Definition at line 424 of file af_pan.c.

Function Documentation

static void skip_spaces ( char **  arg )

static

Definition at line 57 of file af_pan.c.

Referenced by init(), and 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().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 101 of file af_pan.c.

static int are_gains_pure ( const PanContext *  pan )

static

Definition at line 227 of file af_pan.c.

Referenced by query_formats().

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 249 of file af_pan.c.

static int config_props ( AVFilterLink *  link )

static

Definition at line 281 of file af_pan.c.

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

static

Definition at line 395 of file af_pan.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 418 of file af_pan.c.

AVFILTER_DEFINE_CLASS

(

pan

)

Variable Documentation

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 }
}

Definition at line 426 of file af_pan.c.

const AVFilterPad pan_inputs[]

static

Initial value:

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

Definition at line 433 of file af_pan.c.

const AVFilterPad pan_outputs[]

static

Initial value:

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

Definition at line 443 of file af_pan.c.

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,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = pan_inputs,
    .outputs       = pan_outputs,
}

Definition at line 451 of file af_pan.c.