libavfilter/af_channelmap.c File Reference

audio channel mapping filter More...

#include <ctype.h>
#include "libavutil/audioconvert.h"
#include "libavutil/avstring.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
Defines
#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_samples (AVFilterLink *inlink, AVFilterBufferRef *buf)
static int	channelmap_config_input (AVFilterLink *inlink)
Variables
static const AVOption	options []
static const AVClass	channelmap_class
AVFilter	avfilter_af_channelmap

---

Detailed Description

audio channel mapping filter

Definition in file af_channelmap.c.

---

Define Documentation

#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.

#define MAX_CH   64

Definition at line 57 of file af_channelmap.c.

Referenced by channelmap_filter_samples(), and channelmap_init().

#define OFFSET

(

x

)

offsetof(ChannelMapContext, x)

Definition at line 69 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 int channelmap_config_input

(

AVFilterLink *

inlink

)

[static]

Definition at line 361 of file af_channelmap.c.

static int channelmap_filter_samples	(	AVFilterLink *	inlink,
		AVFilterBufferRef *	buf
	)			[static]

Definition at line 316 of file af_channelmap.c.

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 304 of file af_channelmap.c.

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 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 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().

---

Variable Documentation

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        = (const AVFilterPad[]) {{ .name            = "default",
                                              .type            = AVMEDIA_TYPE_AUDIO,
                                              .min_perms       = AV_PERM_READ | AV_PERM_WRITE,
                                              .filter_samples  = channelmap_filter_samples,
                                              .config_props    = channelmap_config_input },
                                            { .name = NULL }},
    .outputs       = (const AVFilterPad[]) {{ .name            = "default",
                                              .type            = AVMEDIA_TYPE_AUDIO },
                                            { .name = NULL }},
    .priv_class = &channelmap_class,
}

Definition at line 388 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.

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.