asrc_anullsrc.c File Reference

#include <inttypes.h>
#include <stdio.h>
#include "libavutil/channel_layout.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"

Go to the source code of this file.

Data Structures
struct	ANullContext

Macros
#define	OFFSET(x)   offsetof(ANullContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (anullsrc)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static av_cold int	config_props (AVFilterLink *outlink)
static int	activate (AVFilterContext *ctx)

Variables
static const AVOption	anullsrc_options []
static const AVFilterPad	avfilter_asrc_anullsrc_outputs []
const AVFilter	ff_asrc_anullsrc

Detailed Description

null audio source

Definition in file asrc_anullsrc.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(ANullContext, x)

Definition at line 47 of file asrc_anullsrc.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 48 of file asrc_anullsrc.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

anullsrc

)

query_formats()

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

static

Definition at line 64 of file asrc_anullsrc.c.

config_props()

static av_cold int config_props ( AVFilterLink *  outlink )

static

Definition at line 80 of file asrc_anullsrc.c.

activate()

static int activate ( AVFilterContext *  ctx )

static

Definition at line 90 of file asrc_anullsrc.c.

Variable Documentation

anullsrc_options

const AVOption anullsrc_options[]

static

Initial value:

= {
    { "channel_layout", "set channel_layout", OFFSET(ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "stereo"}, 0, 0, FLAGS },
    { "cl",             "set channel_layout", OFFSET(ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = "stereo"}, 0, 0, FLAGS },
    { "sample_rate",    "set sample rate",    OFFSET(sample_rate)   , AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT_MAX, FLAGS },
    { "r",              "set sample rate",    OFFSET(sample_rate)   , AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT_MAX, FLAGS },
    { "nb_samples",     "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, UINT16_MAX, FLAGS },
    { "n",              "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, UINT16_MAX, FLAGS },
    { "duration",       "set the audio duration",                        OFFSET(duration),   AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
    { "d",              "set the audio duration",                        OFFSET(duration),   AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
    { NULL }
}

Definition at line 50 of file asrc_anullsrc.c.

avfilter_asrc_anullsrc_outputs

const AVFilterPad avfilter_asrc_anullsrc_outputs[]

static

Initial value:

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

Definition at line 115 of file asrc_anullsrc.c.

ff_asrc_anullsrc

const AVFilter ff_asrc_anullsrc

Initial value:

= {
    .name          = "anullsrc",
    .description   = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),
    .priv_size     = sizeof(ANullContext),
    .inputs        = NULL,
    FILTER_OUTPUTS(avfilter_asrc_anullsrc_outputs),
    FILTER_QUERY_FUNC2(query_formats),
    .activate      = activate,
    .priv_class    = &anullsrc_class,
}

Definition at line 123 of file asrc_anullsrc.c.