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Skip certain ALTREF inter modes in ARF coding

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This commit enables the encoder to skip checking ALTREF inter modes
in ARF coding, if the predicted motion vectors suggest that the
GOLDEN_FRAME provides higher prediction accuracy than ALTREF_FRAME.

It improves the speed 3 encoding speed by about 5%, at the expense
of compression performance loss -0.041% and -0.225% for derf and
stdhd, respectively.

pedestrian_area 1080p 2000 kbps
66705 b/f, 40.909 dB, 118738 ms ->
66732 b/f, 40.908 dB, 113688 ms

old_town_cross 720p 1500 kbps
14427 b/f, 36.256 dB, 62746 ms ->
14412 b/f, 36.252 dB, 60690 ms

blue_sky 1080p 1500 kbps
51026 b/f, 35.897 dB, 73310 ms ->
50921 b/f, 35.893 dB, 70406 ms

bus CIF 1000 kbps
21301 b/f, 34.841 dB, 7326 ms ->
21248 b/f, 34.837 dB, 7196 ms

Change-Id: I76cf88b4d655e1ee3c0cb03c8a5745493040e8d2
This commit is contained in:
Jingning Han 2014-09-26 12:43:14 -07:00
parent 6989e81d61
commit ccdb518ff8
1 changed files with 5 additions and 0 deletions
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5
vp9/encoder/vp9_rdopt.c
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@ -2674,6 +2674,11 @@ int64_t vp9_rd_pick_inter_mode_sb(VP9_COMP *cpi, MACROBLOCK *x,
}
}
if (cpi->sf.alt_ref_search_fp)
if (!cm->show_frame)
if (x->pred_mv_sad[ALTREF_FRAME] > (x->pred_mv_sad[GOLDEN_FRAME] << 1))
mode_skip_mask[ALTREF_FRAME] |= INTER_ALL;
if (bsize > cpi->sf.max_intra_bsize) {
ref_frame_skip_mask[0] |= (1 << INTRA_FRAME);
ref_frame_skip_mask[1] |= (1 << INTRA_FRAME);