FFmpeg
Macros | Functions | Variables
bwdifdsp.c File Reference
#include <stdint.h>
#include <string.h>
#include "config.h"
#include "bwdifdsp.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/macros.h"

Go to the source code of this file.

Macros

#define FILTER_INTRA()
 
#define FILTER1()
 
#define SPAT_CHECK()
 
#define FILTER_LINE()
 
#define FILTER_EDGE()
 
#define FILTER2()
 

Functions

void ff_bwdif_filter_intra_c (void *dst1, const void *cur1, int w, int prefs, int mrefs, int prefs3, int mrefs3, int parity, int clip_max)
 
void ff_bwdif_filter_line_c (void *dst1, const void *prev1, const void *cur1, const void *next1, int w, int prefs, int mrefs, int prefs2, int mrefs2, int prefs3, int mrefs3, int prefs4, int mrefs4, int parity, int clip_max)
 
void ff_bwdif_filter_edge_c (void *dst1, const void *prev1, const void *cur1, const void *next1, int w, int prefs, int mrefs, int prefs2, int mrefs2, int parity, int clip_max, int spat)
 
static void filter_intra_16bit (void *dst1, const void *cur1, int w, int prefs, int mrefs, int prefs3, int mrefs3, int parity, int clip_max)
 
static void filter_line_c_16bit (void *dst1, const void *prev1, const void *cur1, const void *next1, int w, int prefs, int mrefs, int prefs2, int mrefs2, int prefs3, int mrefs3, int prefs4, int mrefs4, int parity, int clip_max)
 
static void filter_edge_16bit (void *dst1, const void *prev1, const void *cur1, const void *next1, int w, int prefs, int mrefs, int prefs2, int mrefs2, int parity, int clip_max, int spat)
 
av_cold void ff_bwdif_init_filter_line (BWDIFDSPContext *s, int bit_depth)
 

Variables

static const uint16_t coef_lf [2] = { 4309, 213 }
 
static const uint16_t coef_hf [3] = { 5570, 3801, 1016 }
 
static const uint16_t coef_sp [2] = { 5077, 981 }
 

Macro Definition Documentation

◆ FILTER_INTRA

#define FILTER_INTRA ( )
Value:
for (x = 0; x < w; x++) { \
interpol = (coef_sp[0] * (cur[mrefs] + cur[prefs]) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
dst[0] = av_clip(interpol, 0, clip_max); \
\
dst++; \
cur++; \
}

Definition at line 52 of file bwdifdsp.c.

◆ FILTER1

#define FILTER1 ( )
Value:
for (x = 0; x < w; x++) { \
int c = cur[mrefs]; \
int d = (prev2[0] + next2[0]) >> 1; \
int e = cur[prefs]; \
int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e)) >> 1; \
int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e)) >> 1; \
int diff = FFMAX3(temporal_diff0 >> 1, temporal_diff1, temporal_diff2); \
if (!diff) { \
dst[0] = d; \
} else {

Definition at line 61 of file bwdifdsp.c.

◆ SPAT_CHECK

#define SPAT_CHECK ( )
Value:
int b = ((prev2[mrefs2] + next2[mrefs2]) >> 1) - c; \
int f = ((prev2[prefs2] + next2[prefs2]) >> 1) - e; \
int dc = d - c; \
int de = d - e; \
int max = FFMAX3(de, dc, FFMIN(b, f)); \
int min = FFMIN3(de, dc, FFMAX(b, f)); \
diff = FFMAX3(diff, min, -max);

Definition at line 75 of file bwdifdsp.c.

◆ FILTER_LINE

#define FILTER_LINE ( )
Value:
if (FFABS(c - e) > temporal_diff0) { \
interpol = (((coef_hf[0] * (prev2[0] + next2[0]) \
- coef_hf[1] * (prev2[mrefs2] + next2[mrefs2] + prev2[prefs2] + next2[prefs2]) \
+ coef_hf[2] * (prev2[mrefs4] + next2[mrefs4] + prev2[prefs4] + next2[prefs4])) >> 2) \
+ coef_lf[0] * (c + e) - coef_lf[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
} else { \
interpol = (coef_sp[0] * (c + e) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
}

Definition at line 84 of file bwdifdsp.c.

◆ FILTER_EDGE

#define FILTER_EDGE ( )
Value:
if (spat) { \
SPAT_CHECK() \
} \
interpol = (c + e) >> 1;

Definition at line 95 of file bwdifdsp.c.

◆ FILTER2

#define FILTER2 ( )
Value:
if (interpol > d + diff) \
interpol = d + diff; \
else if (interpol < d - diff) \
interpol = d - diff; \
\
dst[0] = av_clip(interpol, 0, clip_max); \
} \
\
dst++; \
cur++; \
prev++; \
next++; \
prev2++; \
next2++; \
}

Definition at line 101 of file bwdifdsp.c.

Function Documentation

◆ ff_bwdif_filter_intra_c()

void ff_bwdif_filter_intra_c ( void *  dst1,
const void *  cur1,
int  w,
int  prefs,
int  mrefs,
int  prefs3,
int  mrefs3,
int  parity,
int  clip_max 
)

Definition at line 118 of file bwdifdsp.c.

Referenced by ff_bwdif_init_filter_line(), and filter_intra_helper().

◆ ff_bwdif_filter_line_c()

void ff_bwdif_filter_line_c ( void *  dst1,
const void *  prev1,
const void *  cur1,
const void *  next1,
int  w,
int  prefs,
int  mrefs,
int  prefs2,
int  mrefs2,
int  prefs3,
int  mrefs3,
int  prefs4,
int  mrefs4,
int  parity,
int  clip_max 
)

◆ ff_bwdif_filter_edge_c()

void ff_bwdif_filter_edge_c ( void *  dst1,
const void *  prev1,
const void *  cur1,
const void *  next1,
int  w,
int  prefs,
int  mrefs,
int  prefs2,
int  mrefs2,
int  parity,
int  clip_max,
int  spat 
)

Definition at line 146 of file bwdifdsp.c.

Referenced by ff_bwdif_init_filter_line(), and filter_edge_helper().

◆ filter_intra_16bit()

static void filter_intra_16bit ( void *  dst1,
const void *  cur1,
int  w,
int  prefs,
int  mrefs,
int  prefs3,
int  mrefs3,
int  parity,
int  clip_max 
)
static

Definition at line 163 of file bwdifdsp.c.

Referenced by ff_bwdif_init_filter_line().

◆ filter_line_c_16bit()

static void filter_line_c_16bit ( void *  dst1,
const void *  prev1,
const void *  cur1,
const void *  next1,
int  w,
int  prefs,
int  mrefs,
int  prefs2,
int  mrefs2,
int  prefs3,
int  mrefs3,
int  prefs4,
int  mrefs4,
int  parity,
int  clip_max 
)
static

Definition at line 173 of file bwdifdsp.c.

Referenced by ff_bwdif_init_filter_line().

◆ filter_edge_16bit()

static void filter_edge_16bit ( void *  dst1,
const void *  prev1,
const void *  cur1,
const void *  next1,
int  w,
int  prefs,
int  mrefs,
int  prefs2,
int  mrefs2,
int  parity,
int  clip_max,
int  spat 
)
static

Definition at line 191 of file bwdifdsp.c.

Referenced by ff_bwdif_init_filter_line().

◆ ff_bwdif_init_filter_line()

av_cold void ff_bwdif_init_filter_line ( BWDIFDSPContext s,
int  bit_depth 
)

Definition at line 208 of file bwdifdsp.c.

Referenced by checkasm_check_vf_bwdif(), and config_props().

Variable Documentation

◆ coef_lf

const uint16_t coef_lf[2] = { 4309, 213 }
static

Definition at line 47 of file bwdifdsp.c.

◆ coef_hf

const uint16_t coef_hf[3] = { 5570, 3801, 1016 }
static

Definition at line 48 of file bwdifdsp.c.

◆ coef_sp

const uint16_t coef_sp[2] = { 5077, 981 }
static

Definition at line 49 of file bwdifdsp.c.

interpol
static int interpol(MBContext *s, uint32_t *color, int x, int y, int linesize)
Definition: vsrc_mandelbrot.c:184
av_clip
#define av_clip
Definition: common.h:96
w
uint8_t w
Definition: llviddspenc.c:38
b
#define b
Definition: input.c:41
max
#define max(a, b)
Definition: cuda_runtime.h:33
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
coef_sp
static const uint16_t coef_sp[2]
Definition: bwdifdsp.c:49
SPAT_CHECK
#define SPAT_CHECK()
Definition: bwdifdsp.c:75
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:65
if
if(ret)
Definition: filter_design.txt:179
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
f
f
Definition: af_crystalizer.c:121
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
diff
static av_always_inline int diff(const struct color_info *a, const struct color_info *b, const int trans_thresh)
Definition: vf_paletteuse.c:164
FFMIN3
#define FFMIN3(a, b, c)
Definition: macros.h:50
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
coef_hf
static const uint16_t coef_hf[3]
Definition: bwdifdsp.c:48
FFMAX3
#define FFMAX3(a, b, c)
Definition: macros.h:48
d
d
Definition: ffmpeg_filter.c:422
coef_lf
static const uint16_t coef_lf[2]
Definition: bwdifdsp.c:47
min
float min
Definition: vorbis_enc_data.h:429