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RV3/4: calculate B-frame motion weights once per frame

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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Kostya Shishkov 2011-08-10 11:26:24 +02:00 committed by Ronald S. Bultje
parent d241f51e0f
commit e5ec68699e
2 changed files with 13 additions and 5 deletions
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17
libavcodec/rv34.c
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@ -568,12 +568,8 @@ static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int
*/
static int calc_add_mv(RV34DecContext *r, int dir, int val)
{
int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);
int dist = dir ? -GET_PTS_DIFF(r->next_pts, r->cur_pts) : GET_PTS_DIFF(r->cur_pts, r->last_pts);
int mul;
int mul = dir ? -r->weight2 : r->weight1;
if(!refdist) return 0;
mul = (dist << 14) / refdist;
return (val * mul + 0x2000) >> 14;
}
@ -1273,6 +1269,17 @@ static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int
if(s->pict_type != AV_PICTURE_TYPE_B){
r->last_pts = r->next_pts;
r->next_pts = r->cur_pts;
}else{
int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);
int dist0 = GET_PTS_DIFF(r->cur_pts, r->last_pts);
int dist1 = GET_PTS_DIFF(r->next_pts, r->cur_pts);
if(!refdist){
r->weight1 = r->weight2 = 8192;
}else{
r->weight1 = (dist0 << 14) / refdist;
r->weight2 = (dist1 << 14) / refdist;
}
}
s->mb_x = s->mb_y = 0;
}

1
libavcodec/rv34.h
View File

@ -107,6 +107,7 @@ typedef struct RV34DecContext{
int rpr; ///< one field size in RV30 slice header
int cur_pts, last_pts, next_pts;
int weight1, weight2; ///< B frame distance fractions (0.14) used in motion compensation
uint16_t *cbp_luma; ///< CBP values for luma subblocks
uint8_t *cbp_chroma; ///< CBP values for chroma subblocks