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Code Issues Releases Activity

2x faster ff_mpeg4_set_direct_mv

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Originally committed as revision 5264 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2006-04-03 07:52:24 +00:00
parent f760b70fbe
commit 841f65f25a
2 changed files with 53 additions and 14 deletions
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66
libavcodec/h263.c
View File

@ -552,6 +552,49 @@ void ff_clean_mpeg4_qscales(MpegEncContext *s){
}
#endif //CONFIG_ENCODERS
static void ff_mpeg4_init_direct_mv(MpegEncContext *s){
//FIXME table is stored in MpegEncContext for thread-safety,
// but a static array would be faster
static const int tab_size = sizeof(s->direct_scale_mv[0])/sizeof(int16_t);
static const int tab_bias = (tab_size/2);
int i;
for(i=0; i<tab_size; i++){
s->direct_scale_mv[0][i] = (i-tab_bias)*s->pb_time/s->pp_time;
s->direct_scale_mv[1][i] = (i-tab_bias)*(s->pb_time-s->pp_time)/s->pp_time;
}
}
static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my, int i){
static const int tab_size = sizeof(s->direct_scale_mv[0])/sizeof(int16_t);
static const int tab_bias = (tab_size/2);
int xy= s->block_index[i];
uint16_t time_pp= s->pp_time;
uint16_t time_pb= s->pb_time;
int p_mx, p_my;
p_mx= s->next_picture.motion_val[0][xy][0];
if((unsigned)(p_mx + tab_bias) < tab_size){
s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
: s->direct_scale_mv[1][p_mx + tab_bias];
}else{
s->mv[0][i][0] = p_mx*time_pb/time_pp + mx;
s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
: p_mx*(time_pb - time_pp)/time_pp;
}
p_my= s->next_picture.motion_val[0][xy][1];
if((unsigned)(p_my + tab_bias) < tab_size){
s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
: s->direct_scale_mv[1][p_my + tab_bias];
}else{
s->mv[0][i][1] = p_my*time_pb/time_pp + my;
s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
: p_my*(time_pb - time_pp)/time_pp;
}
}
/**
*
* @return the mb_type
@ -559,23 +602,17 @@ void ff_clean_mpeg4_qscales(MpegEncContext *s){
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
const int mb_index= s->mb_x + s->mb_y*s->mb_stride;
const int colocated_mb_type= s->next_picture.mb_type[mb_index];
int xy= s->block_index[0];
uint16_t time_pp= s->pp_time;
uint16_t time_pb= s->pb_time;
int i;
//FIXME avoid divides
// try special case with shifts for 1 and 3 B-frames?
if(IS_8X8(colocated_mb_type)){
s->mv_type = MV_TYPE_8X8;
for(i=0; i<4; i++){
xy= s->block_index[i];
s->mv[0][i][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp + mx;
s->mv[0][i][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp + my;
s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->next_picture.motion_val[0][xy][0]
: s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
s->mv[1][i][1] = my ? s->mv[0][i][1] - s->next_picture.motion_val[0][xy][1]
: s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
ff_mpeg4_set_one_direct_mv(s, mx, my, i);
}
return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
} else if(IS_INTERLACED(colocated_mb_type)){
@ -600,12 +637,11 @@ int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
}
return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
}else{
s->mv[0][0][0] = s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp + mx;
s->mv[0][0][1] = s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp + my;
s->mv[1][0][0] = s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = mx ? s->mv[0][0][0] - s->next_picture.motion_val[0][xy][0]
: s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
s->mv[1][0][1] = s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = my ? s->mv[0][0][1] - s->next_picture.motion_val[0][xy][1]
: s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->mv[0][0][0];
s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->mv[0][0][1];
s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = s->mv[1][0][0];
s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = s->mv[1][0][1];
if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
s->mv_type= MV_TYPE_16X16;
else
@ -2219,6 +2255,7 @@ void ff_set_mpeg4_time(MpegEncContext * s, int picture_number){
if(s->pict_type==B_TYPE){
s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
assert(s->pb_time > 0 && s->pb_time < s->pp_time);
ff_mpeg4_init_direct_mv(s);
}else{
s->last_time_base= s->time_base;
s->time_base= time_div;
@ -5851,6 +5888,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
// printf("messed up order, maybe after seeking? skipping current b frame\n");
return FRAME_SKIPPED;
}
ff_mpeg4_init_direct_mv(s);
if(s->t_frame==0) s->t_frame= s->pb_time;
if(s->t_frame==0) s->t_frame=1; // 1/0 protection

1
libavcodec/mpegvideo.h
View File

@ -430,6 +430,7 @@ typedef struct MpegEncContext {
int field_select[2][2];
int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
uint8_t *fcode_tab; ///< smallest fcode needed for each MV
int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
MotionEstContext me;