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VP8: Slightly faster MV selection

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Don't clamp best mv unless it's actually used.

Originally committed as revision 24461 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser 2010-07-23 19:06:22 +00:00
parent 14767f35ed
commit 9fddd14a8e
1 changed files with 9 additions and 8 deletions
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17
libavcodec/vp8.c
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@ -589,7 +589,7 @@ static void find_near_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
if (cnt[CNT_NEAREST] >= cnt[CNT_ZERO])
best_idx = CNT_NEAREST;
clamp_mv(s, best, &near_mv[best_idx], mb_x, mb_y);
mb->mv = near_mv[best_idx];
near[0] = near_mv[CNT_NEAREST];
near[1] = near_mv[CNT_NEAR];
}
@ -629,8 +629,7 @@ static const uint8_t *get_submv_prob(uint32_t left, uint32_t top)
* Split motion vector prediction, 16.4.
* @returns the number of motion vectors parsed (2, 4 or 16)
*/
static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
VP8Macroblock *mb, VP56mv *base_mv)
static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb)
{
int part_idx = mb->partitioning =
vp8_rac_get_tree(c, vp8_mbsplit_tree, vp8_mbsplit_prob);
@ -663,8 +662,8 @@ static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
switch (vp8_rac_get_tree(c, vp8_submv_ref_tree, submv_prob)) {
case VP8_SUBMVMODE_NEW4X4:
mb->bmv[n].y = base_mv->y + read_mv_component(c, s->prob->mvc[0]);
mb->bmv[n].x = base_mv->x + read_mv_component(c, s->prob->mvc[1]);
mb->bmv[n].y = mb->mv.y + read_mv_component(c, s->prob->mvc[0]);
mb->bmv[n].x = mb->mv.x + read_mv_component(c, s->prob->mvc[1]);
break;
case VP8_SUBMVMODE_ZERO4X4:
AV_ZERO32(&mb->bmv[n]);
@ -746,7 +745,8 @@ static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_mvinter, p);
switch (mb->mode) {
case VP8_MVMODE_SPLIT:
mb->mv = mb->bmv[decode_splitmvs(s, c, mb, &best) - 1];
clamp_mv(s, &mb->mv, &mb->mv, mb_x, mb_y);
mb->mv = mb->bmv[decode_splitmvs(s, c, mb) - 1];
break;
case VP8_MVMODE_ZERO:
AV_ZERO32(&mb->mv);
@ -758,8 +758,9 @@ static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
clamp_mv(s, &mb->mv, &near[1], mb_x, mb_y);
break;
case VP8_MVMODE_NEW:
mb->mv.y = best.y + read_mv_component(c, s->prob->mvc[0]);
mb->mv.x = best.x + read_mv_component(c, s->prob->mvc[1]);
clamp_mv(s, &mb->mv, &mb->mv, mb_x, mb_y);
mb->mv.y += + read_mv_component(c, s->prob->mvc[0]);
mb->mv.x += + read_mv_component(c, s->prob->mvc[1]);
break;
}
if (mb->mode != VP8_MVMODE_SPLIT) {