af_afade.c File Reference

fade audio filter More...

#include "libavutil/audio_fifo.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	AudioFadeContext

Macros
#define	OFFSET(x)   offsetof(AudioFadeContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	CUBE(a)   ((a)*(a)*(a))
#define	FADE_PLANAR(name, type)
#define	FADE(name, type)

Enumerations
enum	CurveType {   TRI, QSIN, ESIN, HSIN,   LOG, IPAR, QUA, CUB,   SQU, CBR, PAR, EXP,   IQSIN, IHSIN, DESE, DESI,   NB_CURVES }

Functions
static int	query_formats (AVFilterContext *ctx)
static double	fade_gain (int curve, int64_t index, int range)
static int	config_output (AVFilterLink *outlink)

Detailed Description

fade audio filter

Definition in file af_afade.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(AudioFadeContext, x)

Definition at line 57 of file af_afade.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 58 of file af_afade.c.

#define CUBE

(

a

)

((a)*(a)*(a))

Referenced by fade_gain().

#define FADE_PLANAR	(		name,
			type
	)

Value:

static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src,   \
                                     int nb_samples, int channels, int dir, \
                                     int64_t start, int range, int curve)   \
{                                                                           \
    int i, c;                                                               \
                                                                            \
    for (i = 0; i < nb_samples; i++) {                                      \
        double gain = fade_gain(curve, start + i * dir, range);             \
        for (c = 0; c < channels; c++) {                                    \
            type *d = (type *)dst[c];                                       \
            const type *s = (type *)src[c];                                 \
                                                                            \
            d[i] = s[i] * gain;                                             \
        }                                                                   \
    }                                                                       \
}

Definition at line 154 of file af_afade.c.

#define FADE	(		name,
			type
	)

Value:

static void fade_samples_## name (uint8_t **dst, uint8_t * const *src,      \
                                  int nb_samples, int channels, int dir,    \
                                  int64_t start, int range, int curve)      \
{                                                                           \
    type *d = (type *)dst[0];                                               \
    const type *s = (type *)src[0];                                         \
    int i, c, k = 0;                                                        \
                                                                            \
    for (i = 0; i < nb_samples; i++) {                                      \
        double gain = fade_gain(curve, start + i * dir, range);             \
        for (c = 0; c < channels; c++, k++)                                 \
            d[k] = s[k] * gain;                                             \
    }                                                                       \
}

Definition at line 172 of file af_afade.c.

Referenced by avfilter_register_all().

Enumeration Type Documentation

enum CurveType

Enumerator
TRI
QSIN
ESIN
HSIN
LOG
IPAR
QUA
CUB
SQU
CBR
PAR
EXP
IQSIN
IHSIN
DESE
DESI
NB_CURVES

Definition at line 55 of file af_afade.c.

Function Documentation

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 60 of file af_afade.c.

static double fade_gain ( int  curve, int64_t  index, int  range  )

static

Definition at line 93 of file af_afade.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 198 of file af_afade.c.