af_replaygain.c File Reference

#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	ReplayGainFreqInfo
struct	ReplayGainContext

Macros
#define	HISTOGRAM_SLOTS   12000
#define	BUTTER_ORDER   2
#define	YULE_ORDER   10
#define	OFFSET(x)   offsetof(ReplayGainContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_EXPORT|AV_OPT_FLAG_READONLY

Functions
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static void	calc_stereo_peak (const float *samples, int nb_samples, float *peak_p)
static double	calc_stereo_rms (const float *samples, int nb_samples)
static void	butter_filter_stereo_samples (ReplayGainContext *s, float *samples, int nb_samples)
static void	yule_filter_stereo_samples (ReplayGainContext *s, const float *src, float *dst, int nb_samples)
static float	calc_replaygain (uint32_t *histogram)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	request_frame (AVFilterLink *outlink)
	AVFILTER_DEFINE_CLASS (replaygain)

Variables
static const ReplayGainFreqInfo	freqinfos []
static const AVFilterPad	replaygain_inputs []
static const AVFilterPad	replaygain_outputs []
static const AVOption	replaygain_options []
const AVFilter	ff_af_replaygain

Detailed Description

ReplayGain scanner

Definition in file af_replaygain.c.

Macro Definition Documentation

HISTOGRAM_SLOTS

#define HISTOGRAM_SLOTS   12000

Definition at line 36 of file af_replaygain.c.

BUTTER_ORDER

#define BUTTER_ORDER   2

Definition at line 37 of file af_replaygain.c.

YULE_ORDER

#define YULE_ORDER   10

Definition at line 38 of file af_replaygain.c.

OFFSET

#define OFFSET

(

x

)

offsetof(ReplayGainContext, x)

Definition at line 621 of file af_replaygain.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_EXPORT|AV_OPT_FLAG_READONLY

Definition at line 622 of file af_replaygain.c.

Function Documentation

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 329 of file af_replaygain.c.

config_input()

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 350 of file af_replaygain.c.

calc_stereo_peak()

static void calc_stereo_peak ( const float *  samples, int  nb_samples, float *  peak_p  )

static

Definition at line 378 of file af_replaygain.c.

Referenced by filter_frame().

calc_stereo_rms()

static double calc_stereo_rms ( const float *  samples, int  nb_samples  )

static

Definition at line 405 of file af_replaygain.c.

Referenced by filter_frame().

butter_filter_stereo_samples()

static void butter_filter_stereo_samples ( ReplayGainContext *  s, float *  samples, int  nb_samples  )

static

Definition at line 421 of file af_replaygain.c.

Referenced by filter_frame().

yule_filter_stereo_samples()

static void yule_filter_stereo_samples ( ReplayGainContext *  s, const float *  src, float *  dst, int  nb_samples  )

static

Definition at line 470 of file af_replaygain.c.

Referenced by filter_frame().

calc_replaygain()

static float calc_replaygain ( uint32_t *  histogram )

static

Definition at line 537 of file af_replaygain.c.

Referenced by request_frame().

filter_frame()

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

static

Definition at line 555 of file af_replaygain.c.

request_frame()

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 586 of file af_replaygain.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

replaygain

)

Variable Documentation

freqinfos

const ReplayGainFreqInfo freqinfos[]

static

Definition at line 48 of file af_replaygain.c.

Referenced by config_input(), and query_formats().

replaygain_inputs

const AVFilterPad replaygain_inputs[]

static

Initial value:

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

Definition at line 604 of file af_replaygain.c.

replaygain_outputs

const AVFilterPad replaygain_outputs[]

static

Initial value:

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

Definition at line 613 of file af_replaygain.c.

replaygain_options

const AVOption replaygain_options[]

static

Initial value:

= {
    { "track_gain", "track gain (dB)", OFFSET(gain), AV_OPT_TYPE_FLOAT,{.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
    { "track_peak", "track peak",      OFFSET(peak), AV_OPT_TYPE_FLOAT,{.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
    { NULL }
}

Definition at line 624 of file af_replaygain.c.

ff_af_replaygain

const AVFilter ff_af_replaygain

Initial value:

= {
    .name          = "replaygain",
    .description   = NULL_IF_CONFIG_SMALL("ReplayGain scanner."),
    .priv_size     = sizeof(ReplayGainContext),
    .priv_class    = &replaygain_class,
    .flags         = AVFILTER_FLAG_METADATA_ONLY,
    FILTER_INPUTS(replaygain_inputs),
    FILTER_OUTPUTS(replaygain_outputs),
    FILTER_QUERY_FUNC(query_formats),
}

Definition at line 632 of file af_replaygain.c.