FFmpeg
Macros | Functions
h264_mvpred.h File Reference
#include "internal.h"
#include "avcodec.h"
#include "h264dec.h"
#include "mpegutils.h"
#include "libavutil/avassert.h"

Go to the source code of this file.

Macros

#define SET_DIAG_MV(MV_OP, REF_OP, XY, Y4)
 
#define FIX_MV_MBAFF(type, refn, mvn, idx)
 
#define MAP_MVS
 
#define MAP_F2F(idx, mb_type)
 
#define MAP_F2F(idx, mb_type)
 

Functions

static av_always_inline int fetch_diagonal_mv (const H264Context *h, H264SliceContext *sl, const int16_t **C, int i, int list, int part_width)
 
static av_always_inline void pred_motion (const H264Context *const h, H264SliceContext *sl, int n, int part_width, int list, int ref, int *const mx, int *const my)
 Get the predicted MV. More...
 
static av_always_inline void pred_16x8_motion (const H264Context *const h, H264SliceContext *sl, int n, int list, int ref, int *const mx, int *const my)
 Get the directionally predicted 16x8 MV. More...
 
static av_always_inline void pred_8x16_motion (const H264Context *const h, H264SliceContext *sl, int n, int list, int ref, int *const mx, int *const my)
 Get the directionally predicted 8x16 MV. More...
 
static av_always_inline void pred_pskip_motion (const H264Context *const h, H264SliceContext *sl)
 
static void fill_decode_neighbors (const H264Context *h, H264SliceContext *sl, int mb_type)
 
static void fill_decode_caches (const H264Context *h, H264SliceContext *sl, int mb_type)
 
static void av_unused decode_mb_skip (const H264Context *h, H264SliceContext *sl)
 decodes a P_SKIP or B_SKIP macroblock More...
 

Detailed Description

H.264 / AVC / MPEG-4 part10 motion vector prediction.

Author
Michael Niedermayer micha.nosp@m.elni.nosp@m.@gmx..nosp@m.at

Definition in file h264_mvpred.h.

Macro Definition Documentation

◆ SET_DIAG_MV

#define SET_DIAG_MV (   MV_OP,
  REF_OP,
  XY,
  Y4 
)
Value:
const int xy = XY, y4 = Y4; \
const int mb_type = mb_types[xy + (y4 >> 2) * h->mb_stride]; \
if (!USES_LIST(mb_type, list)) \
return LIST_NOT_USED; \
mv = h->cur_pic_ptr->motion_val[list][h->mb2b_xy[xy] + 3 + y4 * h->b_stride]; \
sl->mv_cache[list][scan8[0] - 2][0] = mv[0]; \
sl->mv_cache[list][scan8[0] - 2][1] = mv[1] MV_OP; \
return h->cur_pic_ptr->ref_index[list][4 * xy + 1 + (y4 & ~1)] REF_OP;

◆ FIX_MV_MBAFF

#define FIX_MV_MBAFF (   type,
  refn,
  mvn,
  idx 
)
Value:
if (FRAME_MBAFF(h)) { \
if (MB_FIELD(sl)) { \
if (!IS_INTERLACED(type)) { \
refn <<= 1; \
AV_COPY32(mvbuf[idx], mvn); \
mvbuf[idx][1] /= 2; \
mvn = mvbuf[idx]; \
} \
} else { \
if (IS_INTERLACED(type)) { \
refn >>= 1; \
AV_COPY32(mvbuf[idx], mvn); \
mvbuf[idx][1] *= 2; \
mvn = mvbuf[idx]; \
} \
} \
}

Definition at line 238 of file h264_mvpred.h.

◆ MAP_MVS

#define MAP_MVS
Value:
MAP_F2F(scan8[0] - 1 - 1 * 8, topleft_type) \
MAP_F2F(scan8[0] + 0 - 1 * 8, top_type) \
MAP_F2F(scan8[0] + 1 - 1 * 8, top_type) \
MAP_F2F(scan8[0] + 2 - 1 * 8, top_type) \
MAP_F2F(scan8[0] + 3 - 1 * 8, top_type) \
MAP_F2F(scan8[0] + 4 - 1 * 8, topright_type) \
MAP_F2F(scan8[0] - 1 + 0 * 8, left_type[LTOP]) \
MAP_F2F(scan8[0] - 1 + 1 * 8, left_type[LTOP]) \
MAP_F2F(scan8[0] - 1 + 2 * 8, left_type[LBOT]) \
MAP_F2F(scan8[0] - 1 + 3 * 8, left_type[LBOT])

◆ MAP_F2F [1/2]

#define MAP_F2F (   idx,
  mb_type 
)
Value:
if (!IS_INTERLACED(mb_type) && sl->ref_cache[list][idx] >= 0) { \
sl->ref_cache[list][idx] *= 2; \
sl->mv_cache[list][idx][1] /= 2; \
sl->mvd_cache[list][idx][1] >>= 1; \
}

◆ MAP_F2F [2/2]

#define MAP_F2F (   idx,
  mb_type 
)
Value:
if (IS_INTERLACED(mb_type) && sl->ref_cache[list][idx] >= 0) { \
sl->ref_cache[list][idx] >>= 1; \
sl->mv_cache[list][idx][1] *= 2; \
sl->mvd_cache[list][idx][1] <<= 1; \
}

Function Documentation

◆ fetch_diagonal_mv()

static av_always_inline int fetch_diagonal_mv ( const H264Context *  h,
H264SliceContext *  sl,
const int16_t **  C,
int  i,
int  list,
int  part_width 
)
static

Definition at line 38 of file h264_mvpred.h.

Referenced by pred_8x16_motion(), and pred_motion().

◆ pred_motion()

static av_always_inline void pred_motion ( const H264Context *const  h,
H264SliceContext *  sl,
int  n,
int  part_width,
int  list,
int  ref,
int *const  mx,
int *const  my 
)
static

Get the predicted MV.

Parameters
nthe block index
part_widththe width of the partition (4, 8,16) -> (1, 2, 4)
mxthe x component of the predicted motion vector
mythe y component of the predicted motion vector

Definition at line 95 of file h264_mvpred.h.

Referenced by ff_h264_decode_mb_cabac(), ff_h264_decode_mb_cavlc(), pred_16x8_motion(), and pred_8x16_motion().

◆ pred_16x8_motion()

static av_always_inline void pred_16x8_motion ( const H264Context *const  h,
H264SliceContext *  sl,
int  n,
int  list,
int  ref,
int *const  mx,
int *const  my 
)
static

Get the directionally predicted 16x8 MV.

Parameters
nthe block index
mxthe x component of the predicted motion vector
mythe y component of the predicted motion vector

Definition at line 160 of file h264_mvpred.h.

Referenced by ff_h264_decode_mb_cabac(), and ff_h264_decode_mb_cavlc().

◆ pred_8x16_motion()

static av_always_inline void pred_8x16_motion ( const H264Context *const  h,
H264SliceContext *  sl,
int  n,
int  list,
int  ref,
int *const  mx,
int *const  my 
)
static

Get the directionally predicted 8x16 MV.

Parameters
nthe block index
mxthe x component of the predicted motion vector
mythe y component of the predicted motion vector

Definition at line 201 of file h264_mvpred.h.

Referenced by ff_h264_decode_mb_cabac(), and ff_h264_decode_mb_cavlc().

◆ pred_pskip_motion()

static av_always_inline void pred_pskip_motion ( const H264Context *const  h,
H264SliceContext *  sl 
)
static

Definition at line 257 of file h264_mvpred.h.

Referenced by decode_mb_skip().

◆ fill_decode_neighbors()

static void fill_decode_neighbors ( const H264Context *  h,
H264SliceContext *  sl,
int  mb_type 
)
static

Definition at line 356 of file h264_mvpred.h.

Referenced by decode_mb_skip(), ff_h264_decode_mb_cabac(), and ff_h264_decode_mb_cavlc().

◆ fill_decode_caches()

static void fill_decode_caches ( const H264Context *  h,
H264SliceContext *  sl,
int  mb_type 
)
static

Definition at line 445 of file h264_mvpred.h.

Referenced by decode_mb_skip(), ff_h264_decode_mb_cabac(), and ff_h264_decode_mb_cavlc().

◆ decode_mb_skip()

static void av_unused decode_mb_skip ( const H264Context *  h,
H264SliceContext *  sl 
)
static

decodes a P_SKIP or B_SKIP macroblock

Definition at line 803 of file h264_mvpred.h.

Referenced by ff_h264_decode_mb_cabac(), and ff_h264_decode_mb_cavlc().

mv
static const int8_t mv[256][2]
Definition: 4xm.c:77
MB_FIELD
#define MB_FIELD(sl)
Definition: h264dec.h:72
USES_LIST
#define USES_LIST(a, list)
Definition: mpegutils.h:99
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
MAP_F2F
#define MAP_F2F(idx, mb_type)
if
if(ret)
Definition: filter_design.txt:179
list
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining list
Definition: filter_design.txt:25
IS_INTERLACED
#define IS_INTERLACED(a)
Definition: mpegutils.h:83
FRAME_MBAFF
#define FRAME_MBAFF(h)
Definition: h264dec.h:73
LIST_NOT_USED
#define LIST_NOT_USED
Definition: h264dec.h:396
scan8
static const uint8_t scan8[16 *3+3]
Definition: h264dec.h:650
LBOT
#define LBOT
Definition: h264dec.h:77
LTOP
#define LTOP
Definition: h264dec.h:76
h
h
Definition: vp9dsp_template.c:2038
Generated on Wed Aug 24 2022 21:32:15 for FFmpeg by   doxygen 1.8.17