FFmpeg
Macros | Functions | Variables
mathops.h File Reference
#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/reverse.h"
#include "config.h"

Go to the source code of this file.

Macros

#define MAX_NEG_CROP   1024
 
#define MUL64(a, b)   ((int64_t)(a) * (int64_t)(b))
 
#define MULL(a, b, s)   (MUL64(a, b) >> (s))
 
#define MAC64(d, a, b)   ((d) += MUL64(a, b))
 
#define MLS64(d, a, b)   ((d) -= MUL64(a, b))
 
#define MAC16(rt, ra, rb)   rt += (ra) * (rb)
 
#define MUL16(ra, rb)   ((ra) * (rb))
 
#define MLS16(rt, ra, rb)   ((rt) -= (ra) * (rb))
 
#define mid_pred   mid_pred
 
#define median4   median4
 
#define COPY3_IF_LT(x, y, a, b, c, d)
 
#define MASK_ABS(mask, level)
 
#define NEG_SSR32(a, s)   ((( int32_t)(a))>>(32-(s)))
 
#define NEG_USR32(a, s)   (((uint32_t)(a))>>(32-(s)))
 
#define PACK_2U8(a, b)   (((b) << 8) | (a))
 
#define PACK_4U8(a, b, c, d)   (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
 
#define PACK_2U16(a, b)   (((b) << 16) | (a))
 
#define PACK_2S8(a, b)   PACK_2U8((a)&255, (b)&255)
 
#define PACK_4S8(a, b, c, d)   PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255)
 
#define PACK_2S16(a, b)   PACK_2U16((a)&0xffff, (b)&0xffff)
 
#define FASTDIV(a, b)   ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
 
#define ff_sqrt   ff_sqrt
 

Functions

static av_always_inline int MULH (int a, int b)
 
static av_always_inline unsigned UMULH (unsigned a, unsigned b)
 
static av_const int mid_pred (int a, int b, int c)
 
static av_const int median4 (int a, int b, int c, int d)
 
static av_const int sign_extend (int val, unsigned bits)
 
static av_const unsigned zero_extend (unsigned val, unsigned bits)
 
static av_const unsigned int ff_sqrt (unsigned int a)
 
static av_const float ff_sqrf (float a)
 
static int8_t ff_u8_to_s8 (uint8_t a)
 
static av_always_inline uint32_t bitswap_32 (uint32_t x)
 

Variables

const uint32_t ff_inverse [257]
 
const uint8_t ff_sqrt_tab [256]
 
const uint8_t ff_crop_tab [256+2 *MAX_NEG_CROP]
 
const uint8_t ff_zigzag_direct [64]
 
const uint8_t ff_zigzag_scan [16+1]
 

Macro Definition Documentation

#define MAX_NEG_CROP   1024
#define MUL64 (   a,
  b 
)    ((int64_t)(a) * (int64_t)(b))
#define MULL (   a,
  b,
  s 
)    (MUL64(a, b) >> (s))

Definition at line 58 of file mathops.h.

Referenced by long_term_filter(), lsp2poly(), and silk_is_lpc_stable().

#define MAC64 (   d,
  a,
  b 
)    ((d) += MUL64(a, b))

Definition at line 74 of file mathops.h.

Referenced by ac3_sum_square_butterfly_int32_c().

#define MLS64 (   d,
  a,
  b 
)    ((d) -= MUL64(a, b))

Definition at line 78 of file mathops.h.

#define MAC16 (   rt,
  ra,
  rb 
)    rt += (ra) * (rb)

Definition at line 83 of file mathops.h.

Referenced by g722_apply_qmf().

#define MUL16 (   ra,
  rb 
)    ((ra) * (rb))
#define MLS16 (   rt,
  ra,
  rb 
)    ((rt) -= (ra) * (rb))

Definition at line 92 of file mathops.h.

#define mid_pred   mid_pred
#define median4   median4

Definition at line 116 of file mathops.h.

Referenced by get_chroma_mv(), and get_luma_mv().

#define COPY3_IF_LT (   x,
  y,
  a,
  b,
  c,
 
)
Value:
if ((y) < (x)) {\
(x) = (y);\
(a) = (b);\
(c) = (d);\
}
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
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
#define b
Definition: input.c:41

Definition at line 146 of file mathops.h.

#define MASK_ABS (   mask,
  level 
)
Value:
do { \
mask = level >> 31; \
level = (level ^ mask) - mask; \
} while (0)
static const uint16_t mask[17]
Definition: lzw.c:38
uint8_t level
Definition: svq3.c:207

Definition at line 155 of file mathops.h.

Referenced by dnxhd_init_vlc(), and mpeg1_encode_block().

#define NEG_SSR32 (   a,
  s 
)    ((( int32_t)(a))>>(32-(s)))

Definition at line 162 of file mathops.h.

#define NEG_USR32 (   a,
  s 
)    (((uint32_t)(a))>>(32-(s)))
#define PACK_2U8 (   a,
  b 
)    (((b) << 8) | (a))

Definition at line 181 of file mathops.h.

#define PACK_4U8 (   a,
  b,
  c,
 
)    (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))

Definition at line 184 of file mathops.h.

Referenced by pred4x4_vertical_vp8_c().

#define PACK_2U16 (   a,
  b 
)    (((b) << 16) | (a))

Definition at line 187 of file mathops.h.

#define PACK_2S8 (   a,
  b 
)    PACK_2U8((a)&255, (b)&255)

Definition at line 192 of file mathops.h.

#define PACK_4S8 (   a,
  b,
  c,
 
)    PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255)

Definition at line 195 of file mathops.h.

#define PACK_2S16 (   a,
  b 
)    PACK_2U16((a)&0xffff, (b)&0xffff)

Definition at line 198 of file mathops.h.

#define FASTDIV (   a,
  b 
)    ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
#define ff_sqrt   ff_sqrt

Function Documentation

static av_always_inline int MULH ( int  a,
int  b 
)
static

Definition at line 62 of file mathops.h.

static av_always_inline unsigned UMULH ( unsigned  a,
unsigned  b 
)
static

Definition at line 68 of file mathops.h.

Referenced by pRNG().

static av_const int mid_pred ( int  a,
int  b,
int  c 
)
inlinestatic

Definition at line 98 of file mathops.h.

static av_const int median4 ( int  a,
int  b,
int  c,
int  d 
)
inlinestatic

Definition at line 117 of file mathops.h.

static av_const int sign_extend ( int  val,
unsigned  bits 
)
inlinestatic
static av_const unsigned zero_extend ( unsigned  val,
unsigned  bits 
)
inlinestatic

Definition at line 139 of file mathops.h.

Referenced by get_xbits_le().

static av_const unsigned int ff_sqrt ( unsigned int  a)
inlinestatic

Definition at line 207 of file mathops.h.

static av_const float ff_sqrf ( float  a)
inlinestatic

Definition at line 228 of file mathops.h.

Referenced by search_for_quantizers_twoloop().

static int8_t ff_u8_to_s8 ( uint8_t  a)
inlinestatic

Definition at line 233 of file mathops.h.

Referenced by color_transform_delta().

static av_always_inline uint32_t bitswap_32 ( uint32_t  x)
static

Definition at line 243 of file mathops.h.

Referenced by build_table(), and reverse().

Variable Documentation

const uint32_t ff_inverse[257]

Definition at line 27 of file mathtables.c.

Referenced by dct_quantize_TMPL(), ff_msmpeg4_pred_dc(), and setup_classifs().

const uint8_t ff_sqrt_tab[256]

Definition at line 63 of file mathtables.c.

Referenced by ff_sqrt().

const uint8_t ff_crop_tab[256+2 *MAX_NEG_CROP]

Definition at line 77 of file mathtables.c.

const uint8_t ff_zigzag_direct[64]
const uint8_t ff_zigzag_scan[16+1]