af_afade.c File Reference

fade audio filter More...

#include "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.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	AudioFadeContext

Macros
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	TFLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#define	CUBE(a)
#define	FADE_PLANAR(name, type)
#define	FADE(name, type)
#define	SCALE_PLANAR(name, type)
#define	SCALE(name, type)

Enumerations
enum	CurveType {   NONE = -1 , TRI , QSIN , ESIN ,   HSIN , LOG , IPAR , QUA ,   CUB , SQU , CBR , PAR ,   EXP , IQSIN , IHSIN , DESE ,   DESI , LOSI , SINC , ISINC ,   QUAT , QUATR , QSIN2 , HSIN2 ,   NB_CURVES }

Functions
static double	fade_gain (int curve, int64_t index, int64_t range, double silence, double unity)
static int	config_output (AVFilterLink *outlink)

Variables
static enum AVSampleFormat	sample_fmts []

Detailed Description

fade audio filter

Definition in file af_afade.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(AudioFadeContext, x)

Definition at line 64 of file af_afade.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 65 of file af_afade.c.

TFLAGS

#define TFLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 66 of file af_afade.c.

CUBE

#define CUBE

(

a

)

Value:

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

Referenced by fade_gain().

FADE_PLANAR

#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, int64_t range,int curve,\
                                     double silence, double unity)          \
{                                                                           \
    int i, c;                                                               \
                                                                            \
    for (i = 0; i < nb_samples; i++) {                                      \
        double gain = fade_gain(curve, start + i * dir,range,silence,unity);\
        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 166 of file af_afade.c.

FADE

#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, int64_t range, int curve,  \
                                  double silence, double unity)             \
{                                                                           \
    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,silence,unity);\
        for (c = 0; c < channels; c++, k++)                                 \
            d[k] = s[k] * gain;                                             \
    }                                                                       \
}

Definition at line 185 of file af_afade.c.

Referenced by config_output(), and xfade_opencl_load().

SCALE_PLANAR

#define SCALE_PLANAR	(		name,
			type )

Value:

static void scale_samples_## name ##p(uint8_t **dst, uint8_t * const *src,  \
                                     int nb_samples, int channels,          \
                                     double gain)                           \
{                                                                           \
    int i, c;                                                               \
                                                                            \
    for (i = 0; i < nb_samples; i++) {                                      \
        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 212 of file af_afade.c.

SCALE

#define SCALE	(		name,
			type )

Value:

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

Definition at line 229 of file af_afade.c.

Enumeration Type Documentation

CurveType

enum CurveType

Enumerator
NONE
TRI
QSIN
ESIN
HSIN
LOG
IPAR
QUA
CUB
SQU
CBR
PAR
EXP
IQSIN
IHSIN
DESE
DESI
LOSI
SINC
ISINC
QUAT
QUATR
QSIN2
HSIN2
NB_CURVES

Definition at line 62 of file af_afade.c.

Function Documentation

fade_gain()

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

static

Definition at line 76 of file af_afade.c.

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 253 of file af_afade.c.

Variable Documentation

sample_fmts

enum AVSampleFormat sample_fmts[]

static

Initial value:

= {
        AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,
        AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P,
        AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
        AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
        AV_SAMPLE_FMT_NONE
    }

Definition at line 68 of file af_afade.c.