FFmpeg
Macros | Functions
vp9_intra_lsx.c File Reference
#include "libavcodec/vp9dsp.h"
#include "libavutil/loongarch/loongson_intrinsics.h"
#include "vp9dsp_loongarch.h"

Go to the source code of this file.

Macros

#define LSX_ST_8(_dst0, _dst1, _dst2, _dst3, _dst4, _dst5, _dst6, _dst7, _dst, _stride, _stride2, _stride3, _stride4)
 
#define LSX_ST_8X16(_dst0, _dst1, _dst2, _dst3, _dst4, _dst5, _dst6, _dst7, _dst, _stride)
 
#define INTRA_DC_TL_4X4(dir)
 
#define INTRA_DC_TL_8X8(dir)
 
#define INTRA_DC_TL_16X16(dir)
 
#define INTRA_DC_TL_32X32(dir)
 
#define INTRA_PREDICT_VALDC_16X16_LSX(val)
 
#define INTRA_PREDICT_VALDC_32X32_LSX(val)
 

Functions

void ff_vert_16x16_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *left, const uint8_t *src)
 
void ff_vert_32x32_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *left, const uint8_t *src)
 
void ff_hor_16x16_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src, const uint8_t *top)
 
void ff_hor_32x32_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src, const uint8_t *top)
 
void ff_dc_4x4_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top)
 
 INTRA_DC_TL_4X4 (top)
 
 INTRA_DC_TL_4X4 (left)
 
void ff_dc_8x8_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top)
 
 INTRA_DC_TL_8X8 (top)
 
 INTRA_DC_TL_8X8 (left)
 
void ff_dc_16x16_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top)
 
 INTRA_DC_TL_16X16 (top)
 
 INTRA_DC_TL_16X16 (left)
 
void ff_dc_32x32_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top)
 
 INTRA_DC_TL_32X32 (top)
 
 INTRA_DC_TL_32X32 (left)
 
 INTRA_PREDICT_VALDC_16X16_LSX (127)
 
 INTRA_PREDICT_VALDC_16X16_LSX (128)
 
 INTRA_PREDICT_VALDC_16X16_LSX (129)
 
 INTRA_PREDICT_VALDC_32X32_LSX (127)
 
 INTRA_PREDICT_VALDC_32X32_LSX (128)
 
 INTRA_PREDICT_VALDC_32X32_LSX (129)
 
void ff_tm_4x4_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top_ptr)
 
void ff_tm_8x8_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top_ptr)
 
void ff_tm_16x16_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top_ptr)
 
void ff_tm_32x32_lsx (uint8_t *dst, ptrdiff_t dst_stride, const uint8_t *src_left, const uint8_t *src_top_ptr)
 

Macro Definition Documentation

◆ LSX_ST_8

#define LSX_ST_8 (   _dst0,
  _dst1,
  _dst2,
  _dst3,
  _dst4,
  _dst5,
  _dst6,
  _dst7,
  _dst,
  _stride,
  _stride2,
  _stride3,
  _stride4 
)
Value:
{ \
__lsx_vst(_dst0, _dst, 0); \
__lsx_vstx(_dst1, _dst, _stride); \
__lsx_vstx(_dst2, _dst, _stride2); \
__lsx_vstx(_dst3, _dst, _stride3); \
_dst += _stride4; \
__lsx_vst(_dst4, _dst, 0); \
__lsx_vstx(_dst5, _dst, _stride); \
__lsx_vstx(_dst6, _dst, _stride2); \
__lsx_vstx(_dst7, _dst, _stride3); \
}

Definition at line 26 of file vp9_intra_lsx.c.

◆ LSX_ST_8X16

#define LSX_ST_8X16 (   _dst0,
  _dst1,
  _dst2,
  _dst3,
  _dst4,
  _dst5,
  _dst6,
  _dst7,
  _dst,
  _stride 
)
Value:
{ \
__lsx_vst(_dst0, _dst, 0); \
__lsx_vst(_dst0, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst1, _dst, 0); \
__lsx_vst(_dst1, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst2, _dst, 0); \
__lsx_vst(_dst2, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst3, _dst, 0); \
__lsx_vst(_dst3, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst4, _dst, 0); \
__lsx_vst(_dst4, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst5, _dst, 0); \
__lsx_vst(_dst5, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst6, _dst, 0); \
__lsx_vst(_dst6, _dst, 16); \
_dst += _stride; \
__lsx_vst(_dst7, _dst, 0); \
__lsx_vst(_dst7, _dst, 16); \
_dst += _stride; \
}

Definition at line 41 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_4X4

#define INTRA_DC_TL_4X4 (   dir)
Value:
void ff_dc_##dir##_4x4_lsx(uint8_t *dst, ptrdiff_t dst_stride, \
const uint8_t *left, \
const uint8_t *top) \
{ \
__m128i tmp0, dst0; \
\
tmp0 = __lsx_vldrepl_w(dir, 0); \
dst0 = __lsx_vhaddw_hu_bu(tmp0, tmp0); \
dst0 = __lsx_vhaddw_wu_hu(dst0, dst0); \
dst0 = __lsx_vsrari_w(dst0, 2); \
dst0 = __lsx_vshuf4i_b(dst0, 0); \
__lsx_vstelm_w(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_w(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_w(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_w(dst0, dst, 0, 0); \
}

Definition at line 203 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_8X8

#define INTRA_DC_TL_8X8 (   dir)
Value:
void ff_dc_##dir##_8x8_lsx(uint8_t *dst, ptrdiff_t dst_stride, \
const uint8_t *left, \
const uint8_t *top) \
{ \
__m128i tmp0, dst0; \
\
tmp0 = __lsx_vldrepl_d(dir, 0); \
dst0 = __lsx_vhaddw_hu_bu(tmp0, tmp0); \
dst0 = __lsx_vhaddw_wu_hu(dst0, dst0); \
dst0 = __lsx_vhaddw_du_wu(dst0, dst0); \
dst0 = __lsx_vsrari_w(dst0, 3); \
dst0 = __lsx_vreplvei_b(dst0, 0); \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
dst += dst_stride; \
__lsx_vstelm_d(dst0, dst, 0, 0); \
}

Definition at line 257 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_16X16

#define INTRA_DC_TL_16X16 (   dir)
Value:
void ff_dc_##dir##_16x16_lsx(uint8_t *dst, ptrdiff_t dst_stride, \
const uint8_t *left, \
const uint8_t *top) \
{ \
__m128i tmp0, dst0; \
ptrdiff_t stride2 = dst_stride << 1; \
ptrdiff_t stride3 = stride2 + dst_stride; \
ptrdiff_t stride4 = stride2 << 1; \
\
tmp0 = __lsx_vld(dir, 0); \
dst0 = __lsx_vhaddw_hu_bu(tmp0, tmp0); \
dst0 = __lsx_vhaddw_wu_hu(dst0, dst0); \
dst0 = __lsx_vhaddw_du_wu(dst0, dst0); \
dst0 = __lsx_vhaddw_qu_du(dst0, dst0); \
dst0 = __lsx_vsrari_w(dst0, 4); \
dst0 = __lsx_vreplvei_b(dst0, 0); \
LSX_ST_8(dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst, \
dst_stride, stride2, stride3, stride4); \
dst += stride4; \
LSX_ST_8(dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst, \
dst_stride, stride2, stride3, stride4); \
}

Definition at line 314 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_32X32

#define INTRA_DC_TL_32X32 (   dir)
Value:
void ff_dc_##dir##_32x32_lsx(uint8_t *dst, ptrdiff_t dst_stride, \
const uint8_t *left, \
const uint8_t *top) \
{ \
__m128i tmp0, tmp1, dst0; \
DUP2_ARG2(__lsx_vld, dir, 0, dir, 16, tmp0, tmp1); \
DUP2_ARG2(__lsx_vhaddw_hu_bu, tmp0, tmp0, tmp1, tmp1, tmp0, tmp1); \
dst0 = __lsx_vadd_h(tmp0, tmp1); \
dst0 = __lsx_vhaddw_wu_hu(dst0, dst0); \
dst0 = __lsx_vhaddw_du_wu(dst0, dst0); \
dst0 = __lsx_vhaddw_qu_du(dst0, dst0); \
dst0 = __lsx_vsrari_w(dst0, 5); \
dst0 = __lsx_vreplvei_b(dst0, 0); \
LSX_ST_8X16(dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst0, \
dst, dst_stride); \
LSX_ST_8X16(dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst0, \
dst, dst_stride); \
LSX_ST_8X16(dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst0, \
dst, dst_stride); \
LSX_ST_8X16(dst0, dst0, dst0, dst0, dst0, dst0, dst0, dst0, \
dst, dst_stride); \
}

Definition at line 367 of file vp9_intra_lsx.c.

◆ INTRA_PREDICT_VALDC_16X16_LSX

#define INTRA_PREDICT_VALDC_16X16_LSX (   val)
Value:
void ff_dc_##val##_16x16_lsx(uint8_t *dst, ptrdiff_t dst_stride, \
const uint8_t *left, const uint8_t *top) \
{ \
__m128i out = __lsx_vldi(val); \
ptrdiff_t stride2 = dst_stride << 1; \
ptrdiff_t stride3 = stride2 + dst_stride; \
ptrdiff_t stride4 = stride2 << 1; \
LSX_ST_8(out, out, out, out, out, out, out, out, dst, \
dst_stride, stride2, stride3, stride4); \
dst += stride4; \
LSX_ST_8(out, out, out, out, out, out, out, out, dst, \
dst_stride, stride2, stride3, stride4); \
}

Definition at line 395 of file vp9_intra_lsx.c.

◆ INTRA_PREDICT_VALDC_32X32_LSX

#define INTRA_PREDICT_VALDC_32X32_LSX (   val)
Value:
void ff_dc_##val##_32x32_lsx(uint8_t *dst, ptrdiff_t dst_stride, \
const uint8_t *left, const uint8_t *top) \
{ \
__m128i out = __lsx_vldi(val); \
LSX_ST_8X16(out, out, out, out, out, out, out, out, dst, dst_stride);\
LSX_ST_8X16(out, out, out, out, out, out, out, out, dst, dst_stride);\
LSX_ST_8X16(out, out, out, out, out, out, out, out, dst, dst_stride);\
LSX_ST_8X16(out, out, out, out, out, out, out, out, dst, dst_stride);\
}

Definition at line 415 of file vp9_intra_lsx.c.

Function Documentation

◆ ff_vert_16x16_lsx()

void ff_vert_16x16_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  left,
const uint8_t *  src 
)

Definition at line 70 of file vp9_intra_lsx.c.

◆ ff_vert_32x32_lsx()

void ff_vert_32x32_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  left,
const uint8_t *  src 
)

Definition at line 85 of file vp9_intra_lsx.c.

◆ ff_hor_16x16_lsx()

void ff_hor_16x16_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src,
const uint8_t *  top 
)

Definition at line 99 of file vp9_intra_lsx.c.

◆ ff_hor_32x32_lsx()

void ff_hor_32x32_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src,
const uint8_t *  top 
)

Definition at line 131 of file vp9_intra_lsx.c.

◆ ff_dc_4x4_lsx()

void ff_dc_4x4_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top 
)

Definition at line 181 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_4X4() [1/2]

INTRA_DC_TL_4X4 ( top  )

◆ INTRA_DC_TL_4X4() [2/2]

INTRA_DC_TL_4X4 ( left  )

◆ ff_dc_8x8_lsx()

void ff_dc_8x8_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top 
)

Definition at line 226 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_8X8() [1/2]

INTRA_DC_TL_8X8 ( top  )

◆ INTRA_DC_TL_8X8() [2/2]

INTRA_DC_TL_8X8 ( left  )

◆ ff_dc_16x16_lsx()

void ff_dc_16x16_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top 
)

Definition at line 290 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_16X16() [1/2]

INTRA_DC_TL_16X16 ( top  )

◆ INTRA_DC_TL_16X16() [2/2]

INTRA_DC_TL_16X16 ( left  )

◆ ff_dc_32x32_lsx()

void ff_dc_32x32_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top 
)

Definition at line 341 of file vp9_intra_lsx.c.

◆ INTRA_DC_TL_32X32() [1/2]

INTRA_DC_TL_32X32 ( top  )

◆ INTRA_DC_TL_32X32() [2/2]

INTRA_DC_TL_32X32 ( left  )

◆ INTRA_PREDICT_VALDC_16X16_LSX() [1/3]

INTRA_PREDICT_VALDC_16X16_LSX ( 127  )

◆ INTRA_PREDICT_VALDC_16X16_LSX() [2/3]

INTRA_PREDICT_VALDC_16X16_LSX ( 128  )

◆ INTRA_PREDICT_VALDC_16X16_LSX() [3/3]

INTRA_PREDICT_VALDC_16X16_LSX ( 129  )

◆ INTRA_PREDICT_VALDC_32X32_LSX() [1/3]

INTRA_PREDICT_VALDC_32X32_LSX ( 127  )

◆ INTRA_PREDICT_VALDC_32X32_LSX() [2/3]

INTRA_PREDICT_VALDC_32X32_LSX ( 128  )

◆ INTRA_PREDICT_VALDC_32X32_LSX() [3/3]

INTRA_PREDICT_VALDC_32X32_LSX ( 129  )

◆ ff_tm_4x4_lsx()

void ff_tm_4x4_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top_ptr 
)

Definition at line 431 of file vp9_intra_lsx.c.

◆ ff_tm_8x8_lsx()

void ff_tm_8x8_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top_ptr 
)

Definition at line 461 of file vp9_intra_lsx.c.

◆ ff_tm_16x16_lsx()

void ff_tm_16x16_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top_ptr 
)

Definition at line 510 of file vp9_intra_lsx.c.

◆ ff_tm_32x32_lsx()

void ff_tm_32x32_lsx ( uint8_t *  dst,
ptrdiff_t  dst_stride,
const uint8_t *  src_left,
const uint8_t *  src_top_ptr 
)

Definition at line 595 of file vp9_intra_lsx.c.

out
FILE * out
Definition: movenc.c:54
_stride
ptrdiff_t _stride
Definition: h264pred_template.c:411
DUP2_ARG2
#define DUP2_ARG2(_INS, _IN0, _IN1, _IN2, _IN3, _OUT0, _OUT1)
Definition: loongson_intrinsics.h:58
LSX_ST_8X16
#define LSX_ST_8X16(_dst0, _dst1, _dst2, _dst3, _dst4, _dst5, _dst6, _dst7, _dst, _stride)
Definition: vp9_intra_lsx.c:41
LSX_ST_8
#define LSX_ST_8(_dst0, _dst1, _dst2, _dst3, _dst4, _dst5, _dst6, _dst7, _dst, _stride, _stride2, _stride3, _stride4)
Definition: vp9_intra_lsx.c:26
val
static double val(void *priv, double ch)
Definition: aeval.c:78
left
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 left
Definition: snow.txt:386