vf_boxblur.c File Reference

Apply a boxblur filter to the input video. More...

#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "boxblur.h"

Classes
struct	BoxBlurContext

Macros
#define	BLUR(type, depth)
#define	OFFSET(x)   offsetof(BoxBlurContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Typedefs
typedef struct BoxBlurContext	BoxBlurContext

Functions
	AVFILTER_DEFINE_CLASS (boxblur)

Variables
AVFilter	ff_vf_boxblur

Detailed Description

Apply a boxblur filter to the input video.

Ported from MPlayer libmpcodecs/vf_boxblur.c.

Macro Definition Documentation

BLUR

#define BLUR	(		type,
			depth
	)

Value:

static inline void blur ## depth(type *dst, int dst_step, const type *src,  \
                                 int src_step, int len, int radius)         \
{                                                                           \
    const int length = radius*2 + 1;                                        \
    const int inv = ((1<<16) + length/2)/length;                            \
    int x, sum = src[radius*src_step];                                      \
                                                                            \
    for (x = 0; x < radius; x++)                                            \
        sum += src[x*src_step]<<1;                                          \
                                                                            \
    sum = sum*inv + (1<<15);                                                \
                                                                            \
    for (x = 0; x <= radius; x++) {                                         \
        sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv;   \
        dst[x*dst_step] = sum>>16;                                          \
    }                                                                       \
                                                                            \
    for (; x < len-radius; x++) {                                           \
        sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \
        dst[x*dst_step] = sum >>16;                                         \
    }                                                                       \
                                                                            \
    for (; x < len; x++) {                                                  \
        sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \
        dst[x*dst_step] = sum>>16;                                          \
    }                                                                       \
}

Variable Documentation

ff_vf_boxblur

AVFilter ff_vf_boxblur

Initial value:

= {
    .name          = "boxblur",
    .description   = NULL_IF_CONFIG_SMALL("Blur the input."),
    .priv_size     = sizeof(BoxBlurContext),
    .priv_class    = &boxblur_class,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = avfilter_vf_boxblur_inputs,
    .outputs       = avfilter_vf_boxblur_outputs,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
}