af_afade.c File Reference

fade audio filter More...

#include "framequeue.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"

Classes
struct	AudioFadeContext

Macros
#define	FF_INTERNAL_FIELDS   1
#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)

Typedefs
typedef struct AudioFadeContext	AudioFadeContext

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

Detailed Description

fade audio filter

Macro Definition Documentation

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)  \
{                                                                           \
    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;                                             \
    }                                                                       \
}

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) \
{                                                                           \
    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;                                             \
        }                                                                   \
    }                                                                       \
}