af_drmeter.c File Reference

#include <float.h>
#include "libavutil/ffmath.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	ChannelStats
struct	DRMeterContext

Macros
#define	OFFSET(x)   offsetof(DRMeterContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	SQR(a)   ((a)*(a))

Functions
	AVFILTER_DEFINE_CLASS (drmeter)
static int	query_formats (AVFilterContext *ctx)
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 []
AVFilter	ff_af_drmeter

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(DRMeterContext, x)

Definition at line 46 of file af_drmeter.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 47 of file af_drmeter.c.

#define SQR

(

a

)

((a)*(a))

Definition at line 157 of file af_drmeter.c.

Referenced by print_stats().

Function Documentation

AVFILTER_DEFINE_CLASS

(

drmeter

)

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 56 of file af_drmeter.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 86 of file af_drmeter.c.

static void finish_block ( ChannelStats *  p )

static

Definition at line 99 of file af_drmeter.c.

Referenced by print_stats(), and update_stat().

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

static

Definition at line 117 of file af_drmeter.c.

Referenced by filter_frame().

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

static

Definition at line 128 of file af_drmeter.c.

static void print_stats ( AVFilterContext *  ctx )

static

Definition at line 159 of file af_drmeter.c.

Referenced by uninit().

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 197 of file af_drmeter.c.

Variable Documentation

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 49 of file af_drmeter.c.

const AVFilterPad drmeter_inputs[]

static

Initial value:

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

Definition at line 206 of file af_drmeter.c.

const AVFilterPad drmeter_outputs[]

static

Initial value:

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

Definition at line 215 of file af_drmeter.c.

AVFilter ff_af_drmeter

Initial value:

= {
    .name          = "drmeter",
    .description   = NULL_IF_CONFIG_SMALL("Measure audio dynamic range."),
    .query_formats = query_formats,
    .priv_size     = sizeof(DRMeterContext),
    .priv_class    = &drmeter_class,
    .uninit        = uninit,
    .inputs        = drmeter_inputs,
    .outputs       = drmeter_outputs,
}

Definition at line 224 of file af_drmeter.c.