Updating Opus to a pre-release of 1.1

silk/fixed/schur_FIX.c

Index: silk/fixed/schur_FIX.c
diff --git a/silk/fixed/schur_FIX.c b/silk/fixed/schur_FIX.c
index 43db5018bbbbd9d53eae668211aaf3c7c40bb53b..c4c0ef23b47804e5f56c7c5d58c66556eef5a01e 100644
--- a/silk/fixed/schur_FIX.c
+++ b/silk/fixed/schur_FIX.c
@@ -8,11 +8,11 @@ this list of conditions and the following disclaimer.
 - Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
-- Neither the name of Internet Society, IETF or IETF Trust, nor the 
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
 names of specific contributors, may be used to endorse or promote
 products derived from this software without specific prior written
 permission.
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
@@ -68,6 +68,16 @@ opus_int32 silk_schur(                              /* O    Returns residual ene
     }
 
     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;
+        }
 
         /* Get reflection coefficient */
         rc_tmp_Q15 = -silk_DIV32_16( C[ k + 1 ][ 0 ], silk_max_32( silk_RSHIFT( C[ 0 ][ 1 ], 15 ), 1 ) );
@@ -87,6 +97,10 @@ opus_int32 silk_schur(                              /* O    Returns residual ene
         }
     }
 
+    for(; k < order; k++ ) {
+       rc_Q15[ k ] = 0;
+    }
+
     /* return residual energy */
-    return C[ 0 ][ 1 ];
+    return silk_max_32( 1, C[ 0 ][ 1 ] );
 }