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/mem.h"
#include "libavutil/opt.h"
#include "libswresample/swresample.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"

Go to the source code of this file.

Data Structures
struct	PanContext

Macros
#define	MAX_CHANNELS   64
#define	OFFSET(x)

Functions
static void	skip_spaces (char **arg)
static int	parse_channel_name (char **arg, int *rchannel, int *rnamed)
static int	are_gains_pure (const PanContext *pan)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
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 []
const FFFilter	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 41 of file af_pan.c.

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(PanContext, x)

Definition at line 407 of file af_pan.c.

Function Documentation

skip_spaces()

static void skip_spaces ( char ** arg )

static

Definition at line 58 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 66 of file af_pan.c.

Referenced by init().

are_gains_pure()

static int are_gains_pure ( const PanContext * pan )

static

Definition at line 94 of file af_pan.c.

Referenced by init().

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 116 of file af_pan.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 252 of file af_pan.c.

config_props()

static int config_props ( AVFilterLink * link )

static

Definition at line 272 of file af_pan.c.

filter_frame()

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

static

Definition at line 375 of file af_pan.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 400 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 }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM },
    { NULL }
}

Definition at line 409 of file af_pan.c.

pan_inputs

const AVFilterPad pan_inputs[]

static

Initial value:

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

Definition at line 416 of file af_pan.c.

ff_af_pan

const FFFilter ff_af_pan

Initial value:

= {
    .p.name        = "pan",
    .p.description = NULL_IF_CONFIG_SMALL("Remix channels with coefficients (panning)."),
    .p.priv_class  = &pan_class,
    .priv_size     = sizeof(PanContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(pan_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 425 of file af_pan.c.