vf_spp.c File Reference

Simple post processing filter. More...

#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "filters.h"
#include "qp_table.h"
#include "vf_spp.h"
#include "video.h"

Go to the source code of this file.

Macros
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	TFLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
#define	STORE(pos)
#define	STORE16(pos)

Enumerations
enum	mode { MODE_HARD , MODE_SOFT , NB_MODES }

Functions
static const AVClass *	child_class_iterate (void **iter)
static void *	child_next (void *obj, void *prev)
static void	hardthresh_c (int16_t dst[64], const int16_t src[64], int qp, const uint8_t *permutation)
static void	softthresh_c (int16_t dst[64], const int16_t src[64], int qp, const uint8_t *permutation)
static void	store_slice_c (uint8_t *dst, const int16_t *src, int dst_linesize, int src_linesize, int width, int height, int log2_scale, const uint8_t dither[8][8])
static void	store_slice16_c (uint16_t *dst, const int16_t *src, int dst_linesize, int src_linesize, int width, int height, int log2_scale, const uint8_t dither[8][8], int depth)
static void	add_block (uint16_t *dst, int linesize, const int16_t block[64])
static void	filter (SPPContext *p, uint8_t *dst, uint8_t *src, int dst_linesize, int src_linesize, int width, int height, const uint8_t *qp_table, int qp_stride, int is_luma, int depth)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
static av_cold int	preinit (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	spp_options []
static const AVClass	spp_class
static const uint8_t	ldither [8][8]
static const uint8_t	offset [128][2]
static enum AVPixelFormat	pix_fmts []
static const AVFilterPad	spp_inputs []
const FFFilter	ff_vf_spp

Detailed Description

Simple post processing filter.

This implementation is based on an algorithm described in "Aria Nosratinia Embedded Post-Processing for Enhancement of Compressed Images (1999)"

Originally written by Michael Niedermayer for the MPlayer project, and ported by Clément Bœsch for FFmpeg.

Definition in file vf_spp.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(SPPContext, x)

Definition at line 64 of file vf_spp.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 65 of file vf_spp.c.

TFLAGS

#define TFLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 66 of file vf_spp.c.

STORE

#define STORE

(

pos

)

Value:

    do {                                                     \
    temp = (src[x + y*src_linesize + pos] * (1 << log2_scale) + d[pos]) >> 6;\
    if (temp & 0x100)                                                       \
        temp = ~(temp >> 31);                                               \
    dst[x + y*dst_linesize + pos] = temp;                                   \
} while (0)

Referenced by store_slice_c().

STORE16

#define STORE16

(

pos

)

Value:

    do {                                                   \
    temp = (src[x + y*src_linesize + pos] * (1 << log2_scale) + (d[pos]>>1)) >> 5; \
    if (temp & mask )                                                       \
        temp = ~(temp >> 31);                                               \
    dst[x + y*dst_linesize + pos] = temp;                                   \
} while (0)

Referenced by store_slice16_c().

Enumeration Type Documentation

mode

enum mode

Enumerator
MODE_HARD
MODE_SOFT
NB_MODES

Definition at line 45 of file vf_spp.c.

Function Documentation

child_class_iterate()

static const AVClass * child_class_iterate ( void ** iter )

static

Definition at line 51 of file vf_spp.c.

child_next()

static void * child_next ( void * obj, void * prev )

static

Definition at line 58 of file vf_spp.c.

hardthresh_c()

static void hardthresh_c ( int16_t dst[64], const int16_t src[64], int qp, const uint8_t * permutation )

static

Definition at line 124 of file vf_spp.c.

softthresh_c()

static void softthresh_c ( int16_t dst[64], const int16_t src[64], int qp, const uint8_t * permutation )

static

Definition at line 145 of file vf_spp.c.

store_slice_c()

static void store_slice_c ( uint8_t * dst, const int16_t * src, int dst_linesize, int src_linesize, int width, int height, int log2_scale, const uint8_t dither[8][8] )

static

Definition at line 167 of file vf_spp.c.

Referenced by config_input().

store_slice16_c()

static void store_slice16_c ( uint16_t * dst, const int16_t * src, int dst_linesize, int src_linesize, int width, int height, int log2_scale, const uint8_t dither[8][8], int depth )

static

Definition at line 197 of file vf_spp.c.

Referenced by filter().

add_block()

static void add_block ( uint16_t * dst, int linesize, const int16_t block[64] )

inlinestatic

Definition at line 228 of file vf_spp.c.

Referenced by filter().

filter()

static void filter ( SPPContext * p, uint8_t * dst, uint8_t * src, int dst_linesize, int src_linesize, int width, int height, const uint8_t * qp_table, int qp_stride, int is_luma, int depth )

static

Definition at line 244 of file vf_spp.c.

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 333 of file vf_spp.c.

filter_frame()

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

static

Definition at line 364 of file vf_spp.c.

process_command()

static int process_command ( AVFilterContext * ctx, const char * cmd, const char * args, char * res, int res_len, int flags )

static

Definition at line 444 of file vf_spp.c.

preinit()

static av_cold int preinit ( AVFilterContext * ctx )

static

Definition at line 459 of file vf_spp.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 470 of file vf_spp.c.

Variable Documentation

spp_options

const AVOption spp_options[]

static

Initial value:

= {
    { "quality", "set quality", OFFSET(log2_count), AV_OPT_TYPE_INT, {.i64 = 3}, 0, MAX_LEVEL, TFLAGS },
    { "qp", "force a constant quantizer parameter", OFFSET(qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 63, FLAGS },
    { "mode", "set thresholding mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_HARD}, 0, NB_MODES - 1, FLAGS, .unit = "mode" },
        { "hard", "hard thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_HARD}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
        { "soft", "soft thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_SOFT}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
    { "use_bframe_qp", "use B-frames' QP", OFFSET(use_bframe_qp), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
    { NULL }
}

Definition at line 67 of file vf_spp.c.

spp_class

const AVClass spp_class

static

Initial value:

= {
    .class_name       = "spp",
    .item_name        = av_default_item_name,
    .option           = spp_options,
    .version          = LIBAVUTIL_VERSION_INT,
    .category         = AV_CLASS_CATEGORY_FILTER,
    .child_class_iterate = child_class_iterate,
    .child_next       = child_next,
}

Definition at line 77 of file vf_spp.c.

ldither

const uint8_t ldither[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 88 of file vf_spp.c.

Referenced by filter().

offset

const uint8_t offset[128][2]

static

Initial value:

= {
    {0,0},                                                  
    {0,0},
    {0,0}, {4,4},                                           
    {0,0}, {2,2}, {6,4}, {4,6},                             
    {0,0}, {5,1}, {2,2}, {7,3}, {4,4}, {1,5}, {6,6}, {3,7}, 
 
    {0,0}, {4,0}, {1,1}, {5,1}, {3,2}, {7,2}, {2,3}, {6,3}, 
    {0,4}, {4,4}, {1,5}, {5,5}, {3,6}, {7,6}, {2,7}, {6,7},
 
    {0,0}, {0,2}, {0,4}, {0,6}, {1,1}, {1,3}, {1,5}, {1,7}, 
    {2,0}, {2,2}, {2,4}, {2,6}, {3,1}, {3,3}, {3,5}, {3,7},
    {4,0}, {4,2}, {4,4}, {4,6}, {5,1}, {5,3}, {5,5}, {5,7},
    {6,0}, {6,2}, {6,4}, {6,6}, {7,1}, {7,3}, {7,5}, {7,7},
 
    {0,0}, {4,4}, {0,4}, {4,0}, {2,2}, {6,6}, {2,6}, {6,2}, 
    {0,2}, {4,6}, {0,6}, {4,2}, {2,0}, {6,4}, {2,4}, {6,0},
    {1,1}, {5,5}, {1,5}, {5,1}, {3,3}, {7,7}, {3,7}, {7,3},
    {1,3}, {5,7}, {1,7}, {5,3}, {3,1}, {7,5}, {3,5}, {7,1},
    {0,1}, {4,5}, {0,5}, {4,1}, {2,3}, {6,7}, {2,7}, {6,3},
    {0,3}, {4,7}, {0,7}, {4,3}, {2,1}, {6,5}, {2,5}, {6,1},
    {1,0}, {5,4}, {1,4}, {5,0}, {3,2}, {7,6}, {3,6}, {7,2},
    {1,2}, {5,6}, {1,6}, {5,2}, {3,0}, {7,4}, {3,4}, {7,0},
}

Definition at line 99 of file vf_spp.c.

pix_fmts

enum AVPixelFormat pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,
    AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV411P,
    AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,
    AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
    AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
    AV_PIX_FMT_YUV444P10,  AV_PIX_FMT_YUV422P10,
    AV_PIX_FMT_YUV420P10,
    AV_PIX_FMT_YUV444P9,  AV_PIX_FMT_YUV422P9,
    AV_PIX_FMT_YUV420P9,
    AV_PIX_FMT_GRAY8,
    AV_PIX_FMT_GBRP,
    AV_PIX_FMT_GBRP9,
    AV_PIX_FMT_GBRP10,
    AV_PIX_FMT_NONE
}

Definition at line 316 of file vf_spp.c.

spp_inputs

const AVFilterPad spp_inputs[]

static

Initial value:

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

Definition at line 480 of file vf_spp.c.

ff_vf_spp

const FFFilter ff_vf_spp

Initial value:

= {
    .p.name          = "spp",
    .p.description   = NULL_IF_CONFIG_SMALL("Apply a simple post processing filter."),
    .p.priv_class    = &spp_class,
    .p.flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
    .priv_size       = sizeof(SPPContext),
    .preinit         = preinit,
    .uninit          = uninit,
    FILTER_INPUTS(spp_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
    .process_command = process_command,
}

Definition at line 489 of file vf_spp.c.