diff options
| author | Felicia Lim <flim@google.com> | 2016-03-18 08:52:05 +0800 |
|---|---|---|
| committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2016-03-22 03:10:51 -0400 |
| commit | 02f3ac225f99512364dc69e45e3a849f83b96363 (patch) | |
| tree | cc761cba060fd616a84542bc48eb0c25fa4dc865 | |
| parent | c43b1bc8c0a55dde4b7b33cf3f6eba9595ecdd99 (diff) | |
| download | opus-02f3ac225f99512364dc69e45e3a849f83b96363.tar.gz | |
fix for divide by zero
| -rw-r--r-- | silk/fixed/burg_modified_FIX.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/silk/fixed/burg_modified_FIX.c b/silk/fixed/burg_modified_FIX.c index 4878553b..be79e11d 100644 --- a/silk/fixed/burg_modified_FIX.c +++ b/silk/fixed/burg_modified_FIX.c @@ -200,12 +200,14 @@ void silk_burg_modified_c( /* Max prediction gain exceeded; set reflection coefficient such that max prediction gain is exactly hit */ tmp2 = ( (opus_int32)1 << 30 ) - silk_DIV32_varQ( minInvGain_Q30, invGain_Q30, 30 ); /* Q30 */ rc_Q31 = silk_SQRT_APPROX( tmp2 ); /* Q15 */ - /* Newton-Raphson iteration */ - rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 ); /* Q15 */ - rc_Q31 = silk_LSHIFT32( rc_Q31, 16 ); /* Q31 */ - if( num < 0 ) { - /* Ensure adjusted reflection coefficients has the original sign */ - rc_Q31 = -rc_Q31; + if( rc_Q31 > 0 ) { + /* Newton-Raphson iteration */ + rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 ); /* Q15 */ + rc_Q31 = silk_LSHIFT32( rc_Q31, 16 ); /* Q31 */ + if( num < 0 ) { + /* Ensure adjusted reflection coefficients has the original sign */ + rc_Q31 = -rc_Q31; + } } invGain_Q30 = minInvGain_Q30; reached_max_gain = 1; |