af_drmeter.c File Reference

#include <float.h>
#include "libavutil/ffmath.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"

Go to the source code of this file.

Data Structures
struct	ChannelStats
struct	DRMeterContext

Macros
#define	BINS   32768
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	SQR(a)

Functions
	AVFILTER_DEFINE_CLASS (drmeter)
static int	config_output (AVFilterLink *outlink)
static void	finish_block (ChannelStats *p)
static void	update_stat (DRMeterContext *s, ChannelStats *p, float sample)
static int	filter_frame (AVFilterLink *inlink, AVFrame *buf)
static void	print_stats (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	drmeter_options []
static const AVFilterPad	drmeter_inputs []
static const AVFilterPad	drmeter_outputs []
const FFFilter	ff_af_drmeter

Macro Definition Documentation

BINS

#define BINS   32768

Definition at line 30 of file af_drmeter.c.

Referenced by filter_plane(), finish_block(), and print_stats().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(DRMeterContext, x)

Definition at line 49 of file af_drmeter.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 50 of file af_drmeter.c.

SQR

#define SQR

(

a

)

Value:

((a)*(a))

Definition at line 127 of file af_drmeter.c.

Referenced by print_stats().

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

drmeter

)

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 59 of file af_drmeter.c.

finish_block()

static void finish_block ( ChannelStats * p )

static

Definition at line 72 of file af_drmeter.c.

Referenced by print_stats(), and update_stat().

update_stat()

static void update_stat ( DRMeterContext * s, ChannelStats * p, float sample )

static

Definition at line 90 of file af_drmeter.c.

Referenced by filter_frame().

filter_frame()

static int filter_frame ( AVFilterLink * inlink, AVFrame * buf )

static

Definition at line 99 of file af_drmeter.c.

print_stats()

static void print_stats ( AVFilterContext * ctx )

static

Definition at line 129 of file af_drmeter.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 175 of file af_drmeter.c.

Variable Documentation

drmeter_options

const AVOption drmeter_options[]

static

Initial value:

= {
    { "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=3}, .01, 10, FLAGS },
    { NULL }
}

Definition at line 52 of file af_drmeter.c.

drmeter_inputs

const AVFilterPad drmeter_inputs[]

static

Initial value:

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

Definition at line 184 of file af_drmeter.c.

drmeter_outputs

const AVFilterPad drmeter_outputs[]

static

Initial value:

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

Definition at line 192 of file af_drmeter.c.

ff_af_drmeter

const FFFilter ff_af_drmeter

Initial value:

= {
    .p.name        = "drmeter",
    .p.description = NULL_IF_CONFIG_SMALL("Measure audio dynamic range."),
    .p.priv_class  = &drmeter_class,
    .p.flags       = AVFILTER_FLAG_METADATA_ONLY,
    .priv_size     = sizeof(DRMeterContext),
    .uninit        = uninit,
    FILTER_INPUTS(drmeter_inputs),
    FILTER_OUTPUTS(drmeter_outputs),
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT),
}

Definition at line 200 of file af_drmeter.c.