vf_fspp.c File Reference

Fast Simple Post-processing filter This implementation is based on an algorithm described in "Aria Nosratinia Embedded Post-Processing for Enhancement of Compressed Images (1999)" (http://www.utdallas.edu/~aria/papers/vlsisp99.pdf) Further, with splitting (I)DCT into horizontal/vertical passes, one of them can be performed once per block, not per pixel. More...

#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#include "vf_fspp.h"

Macros
#define	OFFSET(x)   offsetof(FSPPContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	STORE(pos)
#define	STORE2(pos)

Functions
	AVFILTER_DEFINE_CLASS (fspp)
	DECLARE_ALIGNED (32, static const uint8_t, dither)[8][8]

Variables
AVFilter	ff_vf_fspp

Detailed Description

Fast Simple Post-processing filter This implementation is based on an algorithm described in "Aria Nosratinia Embedded Post-Processing for Enhancement of Compressed Images (1999)" (http://www.utdallas.edu/~aria/papers/vlsisp99.pdf) Further, with splitting (I)DCT into horizontal/vertical passes, one of them can be performed once per block, not per pixel.

This allows for much higher speed.

Originally written by Michael Niedermayer and Nikolaj for the MPlayer project, and ported by Arwa Arif for FFmpeg.

Macro Definition Documentation

STORE

#define STORE

(

pos

)

Value:

temp = (src[x + pos] + (d[pos] >> log2_scale)) >> (6 - log2_scale);        \
    src[x + pos] = src[x + pos - 8 * src_stride] = 0;                          \
    if (temp & 0x100) temp = ~(temp >> 31);                                    \
    dst[x + pos] = temp;

STORE2

#define STORE2

(

pos

)

Value:

temp = (src[x + pos] + src[x + pos + 16 * src_stride] + (d[pos] >> log2_scale)) >> (6 - log2_scale);  \
    src[x + pos + 16 * src_stride] = 0;                                                                   \
    if (temp & 0x100) temp = ~(temp >> 31);                                                               \
    dst[x + pos] = temp;

Variable Documentation

ff_vf_fspp

AVFilter ff_vf_fspp

Initial value:

= {
    .name            = "fspp",
    .description     = NULL_IF_CONFIG_SMALL("Apply Fast Simple Post-processing filter."),
    .priv_size       = sizeof(FSPPContext),
    .uninit          = uninit,
    .query_formats   = query_formats,
    .inputs          = fspp_inputs,
    .outputs         = fspp_outputs,
    .priv_class      = &fspp_class,
    .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
}