af_channelmap.c File Reference

audio channel mapping filter More...

#include <ctype.h>
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	ChannelMap
struct	ChannelMapContext

Macros
#define	MAX_CH   64
#define	OFFSET(x)   offsetof(ChannelMapContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM

Enumerations
enum	MappingMode {   MAP_NONE, MAP_ONE_INT, MAP_ONE_STR, MAP_PAIR_INT_INT,   MAP_PAIR_INT_STR, MAP_PAIR_STR_INT, MAP_PAIR_STR_STR }

Functions
static char *	split (char *message, char delim)
static int	get_channel_idx (char **map, int *ch, char delim, int max_ch)
static int	get_channel (char **map, uint64_t *ch, char delim)
static av_cold int	channelmap_init (AVFilterContext *ctx, const char *args)
static int	channelmap_query_formats (AVFilterContext *ctx)
static int	channelmap_filter_frame (AVFilterLink *inlink, AVFilterBufferRef *buf)
static int	channelmap_config_input (AVFilterLink *inlink)

Variables
static const AVOption	options []
static const AVClass	channelmap_class
static const AVFilterPad	avfilter_af_channelmap_inputs []
static const AVFilterPad	avfilter_af_channelmap_outputs []
AVFilter	avfilter_af_channelmap

Detailed Description

audio channel mapping filter

Definition in file af_channelmap.c.

Macro Definition Documentation

#define MAX_CH   64

Definition at line 57 of file af_channelmap.c.

Referenced by channelmap_filter_frame(), and channelmap_init().

#define OFFSET

(

x

)

offsetof(ChannelMapContext, x)

Definition at line 69 of file af_channelmap.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 70 of file af_channelmap.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 71 of file af_channelmap.c.

Enumeration Type Documentation

enum MappingMode

Enumerator:

MAP_NONE
MAP_ONE_INT
MAP_ONE_STR
MAP_PAIR_INT_INT
MAP_PAIR_INT_STR
MAP_PAIR_STR_INT
MAP_PAIR_STR_STR

Definition at line 47 of file af_channelmap.c.

Function Documentation

static char* split ( char *  message, char  delim  )

static

Definition at line 87 of file af_channelmap.c.

Referenced by arith2_get_scaled_value(), arith2_rescale_interval(), avfilter_register_all(), dirac_unpack_block_motion_data(), encode_block(), get_channel(), get_channel_idx(), main(), and mss4_decode_image_block().

static int get_channel_idx ( char **  map, int *  ch, char  delim, int  max_ch  )

static

Definition at line 94 of file af_channelmap.c.

Referenced by channelmap_init().

static int get_channel ( char **  map, uint64_t *  ch, char  delim  )

static

Definition at line 111 of file af_channelmap.c.

Referenced by channelmap_init().

static av_cold int channelmap_init ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 123 of file af_channelmap.c.

static int channelmap_query_formats ( AVFilterContext *  ctx )

static

Definition at line 303 of file af_channelmap.c.

static int channelmap_filter_frame ( AVFilterLink *  inlink, AVFilterBufferRef *  buf  )

static

Definition at line 315 of file af_channelmap.c.

static int channelmap_config_input ( AVFilterLink *  inlink )

static

Definition at line 360 of file af_channelmap.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    { "map", "A comma-separated list of input channel numbers in output order.",
          OFFSET(mapping_str),        AV_OPT_TYPE_STRING, .flags = A|F },
    { "channel_layout", "Output channel layout.",
          OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F },
    { NULL },
}

Definition at line 72 of file af_channelmap.c.

const AVClass channelmap_class

static

Initial value:

= {
    .class_name = "channel map filter",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 80 of file af_channelmap.c.

Referenced by channelmap_init().

const AVFilterPad avfilter_af_channelmap_inputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .min_perms      = AV_PERM_READ | AV_PERM_WRITE,
        .filter_frame   = channelmap_filter_frame,
        .config_props   = channelmap_config_input
    },
    { NULL }
}

Definition at line 396 of file af_channelmap.c.

const AVFilterPad avfilter_af_channelmap_outputs[]

static

Initial value:

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

Definition at line 407 of file af_channelmap.c.

AVFilter avfilter_af_channelmap

Initial value:

= {
    .name          = "channelmap",
    .description   = NULL_IF_CONFIG_SMALL("Remap audio channels."),
    .init          = channelmap_init,
    .query_formats = channelmap_query_formats,
    .priv_size     = sizeof(ChannelMapContext),

    .inputs        = avfilter_af_channelmap_inputs,
    .outputs       = avfilter_af_channelmap_outputs,
    .priv_class    = &channelmap_class,
}

Definition at line 415 of file af_channelmap.c.