ref: 0607abc3dd26e6782ad9577765f9aeef311b0de9
parent: f6bc783d630cd191567259279be1b578a4825244
author: Yunqing Wang <yunqingwang@google.com>
date: Fri Sep 6 12:59:55 EDT 2013
Stop partition checking when distortion is small If the current obtained distortion is very small, which happens for static image case, we pick the current partition type without further split checking. This won't affect regular videos. For static videos, we got 10%~12% encoding speed gain. PSNR was better for some clips, and worse for others. Overall it was even. Change-Id: If787a57bedf46fc595ca4f5ded2b0c0a69e9fdef
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -1790,11 +1790,24 @@
}
sum_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_dist);
if (sum_rd < best_rd) {+ int64_t stop_thresh = 2048;
+
best_rate = this_rate;
best_dist = this_dist;
best_rd = sum_rd;
if (bsize >= BLOCK_8X8)
*(get_sb_partitioning(x, bsize)) = bsize;
+
+ // Adjust threshold according to partition size.
+ stop_thresh >>= 8 - (b_width_log2_lookup[bsize] +
+ b_height_log2_lookup[bsize]);
+
+ // If obtained distortion is very small, choose current partition
+ // and stop splitting.
+ if (this_dist < stop_thresh) {+ do_split = 0;
+ do_rect = 0;
+ }
}
}
restore_context(cpi, mi_row, mi_col, a, l, sa, sl, bsize);