ebur128.c File Reference

#include "ebur128.h"
#include <float.h>
#include <limits.h>
#include <math.h>
#include "libavutil/error.h"
#include "libavutil/macros.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"

Go to the source code of this file.

Data Structures
struct	FFEBUR128StateInternal

Macros
#define	CHECK_ERROR(condition, errorcode, goto_point)
#define	ALMOST_ZERO   0.000001
#define	RELATIVE_GATE   (-10.0)
#define	RELATIVE_GATE_FACTOR   pow(10.0, RELATIVE_GATE / 10.0)
#define	MINUS_20DB   pow(10.0, -20.0 / 10.0)
#define	EBUR128_FILTER(type, scaling_factor)
#define	EBUR128_ADD_FRAMES_PLANAR(type)
#define	FF_EBUR128_ADD_FRAMES(type)

Functions
static void	ebur128_init_filter (FFEBUR128State *st)
static int	ebur128_init_channel_map (FFEBUR128State *st)
static void	init_histogram (void)
FFEBUR128State *	ff_ebur128_init (unsigned int channels, unsigned long samplerate, unsigned long window, int mode)
	Initialize library state. More...
void	ff_ebur128_destroy (FFEBUR128State **st)
	Destroy library state. More...
static double	ebur128_energy_to_loudness (double energy)
static size_t	find_histogram_index (double energy)
static void	ebur128_calc_gating_block (FFEBUR128State *st, size_t frames_per_block, double *optional_output)
int	ff_ebur128_set_channel (FFEBUR128State *st, unsigned int channel_number, int value)
	Set channel type. More...
static int	ebur128_energy_shortterm (FFEBUR128State *st, double *out)
static int	ebur128_calc_relative_threshold (FFEBUR128State **sts, size_t size, double *relative_threshold)
static int	ebur128_gated_loudness (FFEBUR128State **sts, size_t size, double *out)
int	ff_ebur128_relative_threshold (FFEBUR128State *st, double *out)
	Get relative threshold in LUFS. More...
int	ff_ebur128_loudness_global (FFEBUR128State *st, double *out)
	Get global integrated loudness in LUFS. More...
static int	ebur128_energy_in_interval (FFEBUR128State *st, size_t interval_frames, double *out)
int	ff_ebur128_loudness_shortterm (FFEBUR128State *st, double *out)
	Get short-term loudness (last 3s) in LUFS. More...
int	ff_ebur128_loudness_range_multiple (FFEBUR128State **sts, size_t size, double *out)
	Get loudness range (LRA) in LU across multiple instances. More...
int	ff_ebur128_loudness_range (FFEBUR128State *st, double *out)
	Get loudness range (LRA) of programme in LU. More...
int	ff_ebur128_sample_peak (FFEBUR128State *st, unsigned int channel_number, double *out)
	Get maximum sample peak of selected channel in float format. More...

Variables
static AVOnce	histogram_init = AV_ONCE_INIT
static double	histogram_energies [1000]
static double	histogram_energy_boundaries [1001]

Macro Definition Documentation

CHECK_ERROR

#define CHECK_ERROR	(		condition,
			errorcode,
			goto_point
	)

Value:

    if ((condition)) {                                                         \
        errcode = (errorcode);                                                 \
        goto goto_point;                                                       \
    }

Definition at line 56 of file ebur128.c.

ALMOST_ZERO

#define ALMOST_ZERO   0.000001

Definition at line 62 of file ebur128.c.

RELATIVE_GATE

#define RELATIVE_GATE   (-10.0)

Definition at line 64 of file ebur128.c.

RELATIVE_GATE_FACTOR

#define RELATIVE_GATE_FACTOR   pow(10.0, RELATIVE_GATE / 10.0)

Definition at line 65 of file ebur128.c.

MINUS_20DB

#define MINUS_20DB   pow(10.0, -20.0 / 10.0)

Definition at line 66 of file ebur128.c.

EBUR128_FILTER

#define EBUR128_FILTER	(		type,
			scaling_factor
	)

Definition at line 317 of file ebur128.c.

EBUR128_ADD_FRAMES_PLANAR

#define EBUR128_ADD_FRAMES_PLANAR

(

type

)

Definition at line 460 of file ebur128.c.

FF_EBUR128_ADD_FRAMES

#define FF_EBUR128_ADD_FRAMES

(

type

)

Value:

void ff_ebur128_add_frames_##type(FFEBUR128State* st, const type* src,         \
                                    size_t frames) {                           \
  int i;                                                                       \
  const type **buf = (const type**)st->d->data_ptrs;                           \
  for (i = 0; i < st->channels; i++)                                           \
    buf[i] = src + i;                                                          \
  ebur128_add_frames_planar_##type(st, buf, frames, st->channels);             \
}

Definition at line 504 of file ebur128.c.

Function Documentation

ebur128_init_filter()

static void ebur128_init_filter ( FFEBUR128State *  st )

static

Definition at line 106 of file ebur128.c.

Referenced by ff_ebur128_init().

ebur128_init_channel_map()

static int ebur128_init_channel_map ( FFEBUR128State *  st )

static

Definition at line 156 of file ebur128.c.

Referenced by ff_ebur128_init().

init_histogram()

static void init_histogram ( void  )

inlinestatic

Definition at line 204 of file ebur128.c.

Referenced by ff_ebur128_init().

ff_ebur128_init()

FFEBUR128State* ff_ebur128_init	(	unsigned int	channels,
		unsigned long	samplerate,
		unsigned long	window,
		int	mode
	)

Initialize library state.

Parameters

channels	the number of channels.
samplerate	the sample rate.
window	set the maximum window size in ms, set to 0 for auto.
mode	see the mode enum for possible values.

Returns

an initialized library state.

Definition at line 219 of file ebur128.c.

Referenced by config_input().

ff_ebur128_destroy()

void ff_ebur128_destroy

(

FFEBUR128State **

st

)

Destroy library state.

Parameters

st	pointer to a library state.

Definition at line 304 of file ebur128.c.

Referenced by uninit().

ebur128_energy_to_loudness()

static double ebur128_energy_to_loudness ( double  energy )

static

Definition at line 368 of file ebur128.c.

Referenced by ebur128_gated_loudness(), ff_ebur128_loudness_range_multiple(), ff_ebur128_loudness_shortterm(), and ff_ebur128_relative_threshold().

find_histogram_index()

static size_t find_histogram_index ( double  energy )

static

Definition at line 373 of file ebur128.c.

Referenced by ebur128_calc_gating_block(), ebur128_gated_loudness(), and ff_ebur128_loudness_range_multiple().

ebur128_calc_gating_block()

static void ebur128_calc_gating_block ( FFEBUR128State *  st, size_t  frames_per_block, double *  optional_output  )

static

Definition at line 391 of file ebur128.c.

Referenced by ebur128_energy_in_interval().

ff_ebur128_set_channel()

int ff_ebur128_set_channel	(	FFEBUR128State *	st,
		unsigned int	channel_number,
		int	value
	)

Set channel type.

The default is:

• 0 -> FF_EBUR128_LEFT
• 1 -> FF_EBUR128_RIGHT
• 2 -> FF_EBUR128_CENTER
• 3 -> FF_EBUR128_UNUSED
• 4 -> FF_EBUR128_LEFT_SURROUND
• 5 -> FF_EBUR128_RIGHT_SURROUND

Parameters

st	library state.
channel_number	zero based channel index.
value	channel type from the "channel" enum.

Returns

• 0 on success.
• AVERROR(EINVAL) if invalid channel index.

Definition at line 445 of file ebur128.c.

Referenced by config_input().

ebur128_energy_shortterm()

static int ebur128_energy_shortterm ( FFEBUR128State *  st, double *  out  )

static

Definition at line 611 of file ebur128.c.

Referenced by ff_ebur128_loudness_shortterm().

ebur128_calc_relative_threshold()

static int ebur128_calc_relative_threshold ( FFEBUR128State **  sts, size_t  size, double *  relative_threshold  )

static

Definition at line 515 of file ebur128.c.

Referenced by ebur128_gated_loudness(), and ff_ebur128_relative_threshold().

ebur128_gated_loudness()

static int ebur128_gated_loudness ( FFEBUR128State **  sts, size_t  size, double *  out  )

static

Definition at line 538 of file ebur128.c.

Referenced by ff_ebur128_loudness_global().

ff_ebur128_relative_threshold()

int ff_ebur128_relative_threshold	(	FFEBUR128State *	st,
		double *	out
	)

Get relative threshold in LUFS.

Parameters

st	library state
out	relative threshold in LUFS.

Returns

• 0 on success.
• AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.

Definition at line 580 of file ebur128.c.

Referenced by filter_frame(), and uninit().

ff_ebur128_loudness_global()

int ff_ebur128_loudness_global	(	FFEBUR128State *	st,
		double *	out
	)

Get global integrated loudness in LUFS.

Parameters

st	library state.
out	integrated loudness in LUFS. -HUGE_VAL if result is negative infinity.

Returns

• 0 on success.
• AVERROR(EINVAL) if mode "FF_EBUR128_MODE_I" has not been set.

Definition at line 596 of file ebur128.c.

Referenced by filter_frame(), and uninit().

ebur128_energy_in_interval()

static int ebur128_energy_in_interval ( FFEBUR128State *  st, size_t  interval_frames, double *  out  )

static

Definition at line 601 of file ebur128.c.

Referenced by ebur128_energy_shortterm().

ff_ebur128_loudness_shortterm()

int ff_ebur128_loudness_shortterm	(	FFEBUR128State *	st,
		double *	out
	)

Get short-term loudness (last 3s) in LUFS.

Parameters

st	library state.
out	short-term loudness in LUFS. -HUGE_VAL if result is negative infinity.

Returns

• 0 on success.
• AVERROR(EINVAL) if mode "FF_EBUR128_MODE_S" has not been set.

Definition at line 617 of file ebur128.c.

Referenced by filter_frame().

ff_ebur128_loudness_range_multiple()

int ff_ebur128_loudness_range_multiple	(	FFEBUR128State **	sts,
		size_t	size,
		double *	out
	)

Get loudness range (LRA) in LU across multiple instances.

Calculates loudness range according to EBU 3342.

Parameters

sts	array of library states.
size	length of sts
out	loudness range (LRA) in LU. Will not be changed in case of error. AVERROR(EINVAL) will be returned in this case.

Returns

• 0 on success.
• AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.

Definition at line 632 of file ebur128.c.

Referenced by ff_ebur128_loudness_range().

ff_ebur128_loudness_range()

int ff_ebur128_loudness_range	(	FFEBUR128State *	st,
		double *	out
	)

Get loudness range (LRA) of programme in LU.

Calculates loudness range according to EBU 3342.

Parameters

st	library state.
out	loudness range (LRA) in LU. Will not be changed in case of error. AVERROR(EINVAL) will be returned in this case.

Returns

• 0 on success.
• AVERROR(EINVAL) if mode "FF_EBUR128_MODE_LRA" has not been set.

Definition at line 709 of file ebur128.c.

Referenced by filter_frame(), and uninit().

ff_ebur128_sample_peak()

int ff_ebur128_sample_peak	(	FFEBUR128State *	st,
		unsigned int	channel_number,
		double *	out
	)

Get maximum sample peak of selected channel in float format.

Parameters

st	library state
channel_number	channel to analyse
out	maximum sample peak in float format (1.0 is 0 dBFS)

Returns

• 0 on success.
• AVERROR(EINVAL) if mode "FF_EBUR128_MODE_SAMPLE_PEAK" has not been set.
• AVERROR(EINVAL) if invalid channel index.

Definition at line 714 of file ebur128.c.

Referenced by filter_frame(), and uninit().

Variable Documentation

histogram_init

AVOnce histogram_init = AV_ONCE_INIT

static

Definition at line 102 of file ebur128.c.

Referenced by ff_ebur128_init().

histogram_energies

double histogram_energies[1000]

static

Definition at line 103 of file ebur128.c.

Referenced by ebur128_calc_relative_threshold(), ebur128_gated_loudness(), ff_ebur128_loudness_range_multiple(), and init_histogram().

histogram_energy_boundaries

double histogram_energy_boundaries[1001]

static

Definition at line 104 of file ebur128.c.

Referenced by ebur128_calc_gating_block(), ebur128_gated_loudness(), ff_ebur128_loudness_range_multiple(), find_histogram_index(), and init_histogram().