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ref: 74de3a580cca34a855c2846bf249eb224f6e9658
parent: 6862b44e7d6500765dad4bf19e3c21423901802a
author: Jean-Marc Valin <[email protected]>
date: Thu May 16 19:09:34 EDT 2013 

Saturates the last RC to 0.99 when Schur blows up

This is a follow-up on ac76b15. When Schur blows up, we set the last RC to
+/- 0.99 instead of eliminating it.


--- a/silk/fixed/schur64_FIX.c
+++ b/silk/fixed/schur64_FIX.c
@@ -58,6 +58,12 @@
     for( k = 0; k < order; k++ ) {
         /* Check that we won't be getting an unstable rc, otherwise stop here. */
         if (silk_abs_int32(C[ k + 1 ][ 0 ]) >= C[ 0 ][ 1 ]) {
+           if ( C[ k + 1 ][ 0 ] > 0 ) {
+              rc_Q16[ k ] = -SILK_FIX_CONST( .99f, 16 );
+           } else {
+              rc_Q16[ k ] = SILK_FIX_CONST( .99f, 16 );
+           }
+           k++;
            break;
         }
 
--- a/silk/fixed/schur_FIX.c
+++ b/silk/fixed/schur_FIX.c
@@ -70,6 +70,12 @@
     for( k = 0; k < order; k++ ) {
         /* Check that we won't be getting an unstable rc, otherwise stop here. */
         if (silk_abs_int32(C[ k + 1 ][ 0 ]) >= C[ 0 ][ 1 ]) {
+           if ( C[ k + 1 ][ 0 ] > 0 ) {
+              rc_Q15[ k ] = -SILK_FIX_CONST( .99f, 15 );
+           } else {
+              rc_Q15[ k ] = SILK_FIX_CONST( .99f, 15 );
+           }
+           k++;
            break;
         }