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)

static void	store_slice_c (uint8_t dst, int16_t src, ptrdiff_t dst_stride, ptrdiff_t src_stride, ptrdiff_t width, ptrdiff_t height, ptrdiff_t log2_scale)

static void	store_slice2_c (uint8_t dst, int16_t src, ptrdiff_t dst_stride, ptrdiff_t src_stride, ptrdiff_t width, ptrdiff_t height, ptrdiff_t log2_scale)

static void	mul_thrmat_c (int16_t thr_adr_noq, int16_t thr_adr, int q)

static void	filter (FSPPContext p, uint8_t dst, uint8_t src, int dst_stride, int src_stride, int width, int height, uint8_t qp_store, int qp_stride, int is_luma)

static void	column_fidct_c (int16_t thr_adr, int16_t data, int16_t *output, int cnt)

static void	row_idct_c (int16_t workspace, int16_t output_adr, ptrdiff_t output_stride, int cnt)

static void	row_fdct_c (int16_t data, const uint8_t pixels, ptrdiff_t line_size, int cnt)

static int	query_formats (AVFilterContext *ctx)

static int	config_input (AVFilterLink *inlink)

static int	filter_frame (AVFilterLink inlink, AVFrame in)

static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	fspp_options []

static const uint8_t	dither [8][8]

static const short	custom_threshold [64]

static const AVFilterPad	fspp_inputs []

static const AVFilterPad	fspp_outputs []

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.

Definition in file vf_fspp.c.

Macro Definition Documentation

◆ OFFSET

#define OFFSET ( x ) offsetof(FSPPContext, x)

Definition at line 45 of file vf_fspp.c.

◆ FLAGS

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 46 of file vf_fspp.c.

◆ 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;

Referenced by store_slice_c().

◆ 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;

Referenced by store_slice2_c().

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( fspp )

◆ store_slice_c()

static void store_slice_c	(	uint8_t *	dst,
		int16_t *	src,
		ptrdiff_t	dst_stride,
		ptrdiff_t	src_stride,
		ptrdiff_t	width,
		ptrdiff_t	height,
		ptrdiff_t	log2_scale
	)

static

Definition at line 83 of file vf_fspp.c.

Referenced by config_input().

◆ store_slice2_c()

static void store_slice2_c	(	uint8_t *	dst,
		int16_t *	src,
		ptrdiff_t	dst_stride,
		ptrdiff_t	src_stride,
		ptrdiff_t	width,
		ptrdiff_t	height,
		ptrdiff_t	log2_scale
	)

static

Definition at line 113 of file vf_fspp.c.

Referenced by config_input().

◆ mul_thrmat_c()

static void mul_thrmat_c	(	int16_t *	thr_adr_noq,
		int16_t *	thr_adr,
		int	q
	)

static

Definition at line 142 of file vf_fspp.c.

Referenced by config_input().

◆ filter()

static void filter	(	FSPPContext *	p,
		uint8_t *	dst,
		uint8_t *	src,
		int	dst_stride,
		int	src_stride,
		int	width,
		int	height,
		uint8_t *	qp_store,
		int	qp_stride,
		int	is_luma
	)

static

Definition at line 149 of file vf_fspp.c.

Referenced by filter_frame().

◆ column_fidct_c()

static void column_fidct_c	(	int16_t *	thr_adr,
		int16_t *	data,
		int16_t *	output,
		int	cnt
	)

static

Definition at line 247 of file vf_fspp.c.

Referenced by config_input().

◆ row_idct_c()

static void row_idct_c	(	int16_t *	workspace,
		int16_t *	output_adr,
		ptrdiff_t	output_stride,
		int	cnt
	)

static

Definition at line 370 of file vf_fspp.c.

Referenced by config_input().

◆ row_fdct_c()

static void row_fdct_c	(	int16_t *	data,
		const uint8_t *	pixels,
		ptrdiff_t	line_size,
		int	cnt
	)

static

Definition at line 432 of file vf_fspp.c.

Referenced by config_input().

◆ query_formats()

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 493 of file vf_fspp.c.

◆ config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 511 of file vf_fspp.c.

◆ filter_frame()

static int filter_frame	(	AVFilterLink *	inlink,
		AVFrame *	in
	)

static

Definition at line 548 of file vf_fspp.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 657 of file vf_fspp.c.

Variable Documentation

◆ fspp_options

const AVOption fspp_options[]

static

Initial value:

= {
    { "quality",       "set quality",                          OFFSET(log2_count),    AV_OPT_TYPE_INT, {.i64 = 4},   4, MAX_LEVEL, FLAGS },
    { "qp",            "force a constant quantizer parameter", OFFSET(qp),            AV_OPT_TYPE_INT, {.i64 = 0},   0, 64,        FLAGS },
    { "strength",      "set filter strength",                  OFFSET(strength),      AV_OPT_TYPE_INT, {.i64 = 0}, -15, 32,        FLAGS },
    { "use_bframe_qp", "use B-frames' QP",                     OFFSET(use_bframe_qp), AV_OPT_TYPE_BOOL,{.i64 = 0},   0, 1,         FLAGS },
    { NULL }
}

Definition at line 47 of file vf_fspp.c.

◆ dither

const uint8_t dither[8][8]

static

Initial value:

= {
    {  0,  48,  12,  60,   3,  51,  15,  63, },
    { 32,  16,  44,  28,  35,  19,  47,  31, },
    {  8,  56,   4,  52,  11,  59,   7,  55, },
    { 40,  24,  36,  20,  43,  27,  39,  23, },
    {  2,  50,  14,  62,   1,  49,  13,  61, },
    { 34,  18,  46,  30,  33,  17,  45,  29, },
    { 10,  58,   6,  54,   9,  57,   5,  53, },
    { 42,  26,  38,  22,  41,  25,  37,  21, },
}

Definition at line 57 of file vf_fspp.c.

Referenced by ac3_decode_transform_coeffs_ch(), encode_frame(), quantize_triangular_ns(), render_charset(), rv40_loop_filter(), store_slice2_c(), store_slice_c(), and yuv2yuvX().

◆ custom_threshold

const short custom_threshold[64]

static

Initial value:

= {
     71, 296, 295, 237,  71,  40,  38,  19,
    245, 193, 185, 121, 102,  73,  53,  27,
    158, 129, 141, 107,  97,  73,  50,  26,
    102, 116, 109,  98,  82,  66,  45,  23,
     71,  94,  95,  81,  70,  56,  38,  20,
     56,  77,  74,  66,  56,  44,  30,  15,
     38,  53,  50,  45,  38,  30,  21,  11,
     20,  27,  26,  23,  20,  15,  11,   5
}

Definition at line 68 of file vf_fspp.c.

Referenced by filter_frame().

◆ fspp_inputs

const AVFilterPad fspp_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_input,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 665 of file vf_fspp.c.

◆ fspp_outputs

const AVFilterPad fspp_outputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
}

Definition at line 675 of file vf_fspp.c.

◆ 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,
}

Definition at line 683 of file vf_fspp.c.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ OFFSET

◆ FLAGS

◆ STORE

◆ STORE2

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ store_slice_c()

◆ store_slice2_c()

◆ mul_thrmat_c()

◆ filter()

◆ column_fidct_c()

◆ row_idct_c()

◆ row_fdct_c()

◆ query_formats()

◆ config_input()

◆ filter_frame()

◆ uninit()

Variable Documentation

◆ fspp_options

◆ dither

◆ custom_threshold

◆ fspp_inputs

◆ fspp_outputs

◆ ff_vf_fspp