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asrc_anullsrc.c File Reference

null audio source More...

#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 "internal.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 av_cold int init (AVFilterContext *ctx)
 
static int query_formats (AVFilterContext *ctx)
 
static int config_props (AVFilterLink *outlink)
 
static int request_frame (AVFilterLink *outlink)
 

Variables

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

Detailed Description

null audio source

Definition in file asrc_anullsrc.c.

Macro Definition Documentation

#define OFFSET (   x)    offsetof(ANullContext, x)

Definition at line 47 of file asrc_anullsrc.c.

Definition at line 48 of file asrc_anullsrc.c.

Function Documentation

AVFILTER_DEFINE_CLASS ( anullsrc  )
static av_cold int init ( AVFilterContext ctx)
static

Definition at line 62 of file asrc_anullsrc.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 78 of file asrc_anullsrc.c.

static int config_props ( AVFilterLink outlink)
static

Definition at line 93 of file asrc_anullsrc.c.

static int request_frame ( AVFilterLink outlink)
static

Definition at line 106 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 }
}
#define NULL
Definition: coverity.c:32
#define OFFSET(x)
Definition: asrc_anullsrc.c:47
#define FLAGS
Definition: asrc_anullsrc.c:48

Definition at line 50 of file asrc_anullsrc.c.

const AVFilterPad avfilter_asrc_anullsrc_outputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_props,
.request_frame = request_frame,
},
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int config_props(AVFilterLink *outlink)
Definition: asrc_anullsrc.c:93
static int request_frame(AVFilterLink *outlink)

Definition at line 129 of file asrc_anullsrc.c.

AVFilter ff_asrc_anullsrc
Initial value:
= {
.name = "anullsrc",
.description = NULL_IF_CONFIG_SMALL("Null audio source, return empty audio frames."),
.init = init,
.query_formats = query_formats,
.priv_size = sizeof(ANullContext),
.priv_class = &anullsrc_class,
}
#define NULL
Definition: coverity.c:32
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:180
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
static const AVFilterPad avfilter_asrc_anullsrc_outputs[]
static int query_formats(AVFilterContext *ctx)
Definition: asrc_anullsrc.c:78
static av_cold int init(AVFilterContext *ctx)
Definition: asrc_anullsrc.c:62

Definition at line 139 of file asrc_anullsrc.c.