commit c54692b5ac0fbb8fae8c1c5ab6686c5301aff399
author Alex Converse <aconverse@google.com> Wed Jan 25 16:41:05 2017 -0800
committer Alex Converse <aconverse@google.com> Sat Feb 04 02:40:26 2017 +0000
tree a39234a6b15eb39e7ba9699160586724c3367811
parent e2746e30b95d78e3c0a467c969232341ea897dc6

ans: Switch from uABS to rABS

This is in preparation for expanding the state range.

No discernible compression impact

ans_multioff@2017-01-25T20:58:18.756Z -> ans_multioff_rabs@2017-01-26T01:05:12.801Z

     PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
  -0.0001 | -0.0001 | -0.0001 |  -0.0001 | -0.0001 | -0.0001 | -0.0001

https://arewecompressedyet.com/?job=ans_multioff%402017-01-25T20%3A58%3A18.756Z&job=ans_multioff_rabs%402017-01-26T01%3A05%3A12.801Z

Change-Id: Ie1817991190f1de6d9c31e0c97f77efbd5869d35

aom_dsp/buf_ans.h

diff --git a/aom_dsp/buf_ans.h b/aom_dsp/buf_ans.h
index 2a36a64..90f36a2 100644
--- a/aom_dsp/buf_ans.h
+++ b/aom_dsp/buf_ans.h
@@ -25,11 +25,11 @@
 extern "C" {
 #endif  // __cplusplus
 
-#define ANS_METHOD_UABS 0
+#define ANS_METHOD_RABS 0
 #define ANS_METHOD_RANS 1
 
 struct buffered_ans_symbol {
-  unsigned int method : 1;  // one of ANS_METHOD_UABS or ANS_METHOD_RANS
+  unsigned int method : 1;  // one of ANS_METHOD_RABS or ANS_METHOD_RANS
   // TODO(aconverse): Should be possible to write this in terms of start for ABS
   unsigned int val_start : RANS_PROB_BITS;  // Boolean value for ABS
                                             // start in symbol cycle for Rans
@@ -71,7 +71,7 @@
   ans_write_init(&c->ans, output_buffer);
 }
 
-static INLINE void buf_uabs_write(struct BufAnsCoder *const c, uint8_t val,
+static INLINE void buf_rabs_write(struct BufAnsCoder *const c, uint8_t val,
                                   AnsP8 prob) {
   assert(c->offset <= c->size);
 #if !ANS_MAX_SYMBOLS
@@ -79,7 +79,7 @@
     aom_buf_ans_grow(c);
   }
 #endif
-  c->buf[c->offset].method = ANS_METHOD_UABS;
+  c->buf[c->offset].method = ANS_METHOD_RABS;
   c->buf[c->offset].val_start = val;
   c->buf[c->offset].prob = prob;
   ++c->offset;
@@ -105,17 +105,17 @@
 #endif
 }
 
-static INLINE void buf_uabs_write_bit(struct BufAnsCoder *c, int bit) {
-  buf_uabs_write(c, bit, 128);
+static INLINE void buf_rabs_write_bit(struct BufAnsCoder *c, int bit) {
+  buf_rabs_write(c, bit, 128);
 }
 
-static INLINE void buf_uabs_write_literal(struct BufAnsCoder *c, int literal,
+static INLINE void buf_rabs_write_literal(struct BufAnsCoder *c, int literal,
                                           int bits) {
   int bit;
 
   assert(bits < 31);
   for (bit = bits - 1; bit >= 0; bit--)
-    buf_uabs_write_bit(c, 1 & (literal >> bit));
+    buf_rabs_write_bit(c, 1 & (literal >> bit));
 }
 
 static INLINE int buf_ans_write_end(struct BufAnsCoder *const c) {