Author: marco
Date: Sat Aug 18 00:28:25 2007
New Revision: 925
Log:
Fix a regression in updating the arithmetic coding contexts
Modified:
dirac/libavcodec/dirac_arith.c
Modified: dirac/libavcodec/dirac_arith.c
==============================================================================
--- dirac/libavcodec/dirac_arith.c (original)
+++ dirac/libavcodec/dirac_arith.c Sat Aug 18 00:28:25 2007
@@ -170,11 +170,11 @@ void dirac_arith_put_bit(dirac_arith_sta
if (bit == 0) {
arith->range = (arith->range * prob_zero) >> 16;
- arith->contexts[context] -= arith_lookup[arith->contexts[context] >>
8];
+ arith->contexts[context] += arith_lookup[255 -
(arith->contexts[context] >> 8)];
} else {
arith->low += (arith->range * prob_zero) >> 16;
arith->range -= (arith->range * prob_zero) >> 16;
- arith->contexts[context] += arith_lookup[255 -
(arith->contexts[context] >> 8)];
+ arith->contexts[context] -= arith_lookup[arith->contexts[context] >>
8];
}
/* Renormalisation and output. */
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