From: Ronald S. Bultje <rbultje@google.com>
Date: Mon, 22 Oct 2012 18:05:56 +0000 (-0700)
Subject: Invert SB probability.
X-Git-Tag: v1.3.0~1217^2~205^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ef50e48323078c823e993aedd087fe25e0afb7f1;p=libvpx

Invert SB probability.

It currently counts the probability that the branch is true, but it
should count the probability that the branch is false.

Change-Id: I963825da2e7a7ed3a613eb23ffd085e427dc36e5
---

diff --git a/vp8/encoder/bitstream.c b/vp8/encoder/bitstream.c
index 70cdb6aaf..f74f85fad 100644
--- a/vp8/encoder/bitstream.c
+++ b/vp8/encoder/bitstream.c
@@ -2561,7 +2561,7 @@ void vp8_pack_bitstream(VP8_COMP *cpi, unsigned char *dest, unsigned long *size)
     /* sb mode probability */
     const int sb_max = (((pc->mb_rows + 1) >> 1) * ((pc->mb_cols + 1) >> 1));
 
-    pc->sb_coded = get_prob(cpi->sb_count, sb_max);
+    pc->sb_coded = get_prob(sb_max - cpi->sb_count, sb_max);
     vp8_write_literal(&header_bc, pc->sb_coded, 8);
   }
 #endif