af_pan.c File Reference

#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 []
const 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.

OFFSET

#define OFFSET

(

x

)

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 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 93 of file af_pan.c.

are_gains_pure()

static int are_gains_pure ( const PanContext *  pan )

static

Definition at line 222 of file af_pan.c.

Referenced by query_formats().

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 244 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 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,
    FILTER_INPUTS(pan_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_QUERY_FUNC(query_formats),
}

Definition at line 425 of file af_pan.c.