libavfilter/asrc_anullsrc.c File Reference

null audio source More...

#include <inttypes.h>
#include <stdio.h>
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
#include "libavutil/audioconvert.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"

Go to the source code of this file.

Data Structures
struct	ANullContext
Defines
#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	init (AVFilterContext *ctx, const char *args)
static int	config_props (AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)
Variables
static const AVOption	anullsrc_options []
AVFilter	avfilter_asrc_anullsrc

---

Detailed Description

null audio source

Definition in file asrc_anullsrc.c.

---

Define Documentation

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 49 of file asrc_anullsrc.c.

#define OFFSET

(

x

)

offsetof(ANullContext, x)

Definition at line 48 of file asrc_anullsrc.c.

---

Function Documentation

AVFILTER_DEFINE_CLASS

(

anullsrc

)

static int config_props

(

AVFilterLink *

outlink

)

[static]

Definition at line 85 of file asrc_anullsrc.c.

static int init	(	AVFilterContext *	ctx,
		const char *	args
	)			[static]

Definition at line 63 of file asrc_anullsrc.c.

static int request_frame

(

AVFilterLink *

outlink

)

[static]

Definition at line 103 of file asrc_anullsrc.c.

---

Variable Documentation

const AVOption anullsrc_options[] [static]

Initial value:

 {
    { "channel_layout", "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
    { "cl",             "set channel_layout", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, FLAGS },
    { "sample_rate",    "set sample rate",    OFFSET(sample_rate_str)   , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
    { "r",              "set sample rate",    OFFSET(sample_rate_str)   , AV_OPT_TYPE_STRING, {.str = "44100"}, 0, 0, FLAGS },
    { "nb_samples",     "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
    { "n",              "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 0, INT_MAX, FLAGS },
    { NULL },
}

Definition at line 51 of file asrc_anullsrc.c.

AVFilter avfilter_asrc_anullsrc

Initial value:

 {
    .name        = "anullsrc",
    .description = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),

    .init        = init,
    .priv_size   = sizeof(ANullContext),

    .inputs      = NULL,

    .outputs     = (const AVFilterPad[]) {{ .name = "default",
                                            .type = AVMEDIA_TYPE_AUDIO,
                                            .config_props = config_props,
                                            .request_frame = request_frame, },
                                          { .name = NULL}},
    .priv_class = &anullsrc_class,
}

Definition at line 122 of file asrc_anullsrc.c.