af_join.c File Reference

Audio join filter. More...

#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.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	JoinContext
struct	JoinBufferPriv
	To avoid copying the data from input buffers, this filter creates a custom output buffer that stores references to all inputs and unrefs them on free. More...

Macros
#define	OFFSET(x)   offsetof(JoinContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM
#define	PARSE_CHANNEL(str, var, inout)

Functions
static int	filter_frame (AVFilterLink *link, AVFilterBufferRef *buf)
static int	parse_maps (AVFilterContext *ctx)
static int	join_init (AVFilterContext *ctx, const char *args)
static void	join_uninit (AVFilterContext *ctx)
static int	join_query_formats (AVFilterContext *ctx)
static void	guess_map_matching (AVFilterContext *ctx, ChannelMap *ch, uint64_t *inputs)
static void	guess_map_any (AVFilterContext *ctx, ChannelMap *ch, uint64_t *inputs)
static int	join_config_output (AVFilterLink *outlink)
static void	join_free_buffer (AVFilterBuffer *buf)
static int	join_request_frame (AVFilterLink *outlink)

Variables
static const AVOption	join_options []
static const AVClass	join_class
static const AVFilterPad	avfilter_af_join_outputs []
AVFilter	avfilter_af_join

Detailed Description

Audio join filter.

Join multiple audio inputs as different channels in a single output

Definition in file af_join.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(JoinContext, x)

Definition at line 77 of file af_join.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 78 of file af_join.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 79 of file af_join.c.

#define PARSE_CHANNEL	(		str,
			var,
			inout
	)

Value:

if (!(var = av_get_channel_layout(str))) {                             \
            av_log(ctx, AV_LOG_ERROR, "Invalid " inout " channel: %s.\n", str);\
            return AVERROR(EINVAL);                                            \
        }                                                                      \
        if (av_get_channel_layout_nb_channels(var) != 1) {                     \
            av_log(ctx, AV_LOG_ERROR, "Channel map describes more than one "   \
                   inout " channel.\n");                                       \
            return AVERROR(EINVAL);                                            \
        }

Referenced by parse_maps().

Function Documentation

static int filter_frame ( AVFilterLink *  link, AVFilterBufferRef *  buf  )

static

Definition at line 97 of file af_join.c.

Referenced by join_init().

static int parse_maps ( AVFilterContext *  ctx )

static

Definition at line 113 of file af_join.c.

Referenced by join_init().

static int join_init ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 191 of file af_join.c.

static void join_uninit ( AVFilterContext *  ctx )

static

Definition at line 244 of file af_join.c.

static int join_query_formats ( AVFilterContext *  ctx )

static

Definition at line 259 of file af_join.c.

static void guess_map_matching ( AVFilterContext *  ctx, ChannelMap *  ch, uint64_t *  inputs  )

static

Definition at line 278 of file af_join.c.

Referenced by join_config_output().

static void guess_map_any ( AVFilterContext *  ctx, ChannelMap *  ch, uint64_t *  inputs  )

static

Definition at line 296 of file af_join.c.

Referenced by join_config_output().

static int join_config_output ( AVFilterLink *  outlink )

static

Definition at line 315 of file af_join.c.

static void join_free_buffer ( AVFilterBuffer *  buf )

static

Definition at line 397 of file af_join.c.

Referenced by join_request_frame().

static int join_request_frame ( AVFilterLink *  outlink )

static

Definition at line 416 of file af_join.c.

Variable Documentation

const AVOption join_options[]

static

Initial value:

= {
    { "inputs",         "Number of input streams.", OFFSET(inputs),             AV_OPT_TYPE_INT,    { .i64 = 2 }, 1, INT_MAX,       A|F },
    { "channel_layout", "Channel layout of the "
                        "output stream.",           OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },
    { "map",            "A comma-separated list of channels maps in the format "
                        "'input_stream.input_channel-output_channel.",
                                                    OFFSET(map),                AV_OPT_TYPE_STRING,                 .flags = A|F },
    { NULL },
}

Definition at line 80 of file af_join.c.

const AVClass join_class

static

Initial value:

= {
    .class_name = "join filter",
    .item_name  = av_default_item_name,
    .option     = join_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 90 of file af_join.c.

Referenced by join_init().

const AVFilterPad avfilter_af_join_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .config_props  = join_config_output,
        .request_frame = join_request_frame,
    },
    { NULL }
}

Definition at line 487 of file af_join.c.

AVFilter avfilter_af_join

Initial value:

= {
    .name           = "join",
    .description    = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "
                                           "multi-channel output"),
    .priv_size      = sizeof(JoinContext),

    .init           = join_init,
    .uninit         = join_uninit,
    .query_formats  = join_query_formats,

    .inputs  = NULL,
    .outputs = avfilter_af_join_outputs,
    .priv_class = &join_class,
}

Definition at line 497 of file af_join.c.