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fix for divide by zero

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Felicia Lim 2016-03-18 08:52:05 +08:00 • committed by Jean-Marc Valin
parent c43b1bc8c0
commit 02f3ac225f
1 changed files with 8 additions and 6 deletions
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14
silk/fixed/burg_modified_FIX.c
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@ -200,12 +200,14 @@ void silk_burg_modified_c(
/* Max prediction gain exceeded; set reflection coefficient such that max prediction gain is exactly hit */ /* 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 */ tmp2 = ( (opus_int32)1 << 30 ) - silk_DIV32_varQ( minInvGain_Q30, invGain_Q30, 30 ); /* Q30 */
rc_Q31 = silk_SQRT_APPROX( tmp2 ); /* Q15 */ rc_Q31 = silk_SQRT_APPROX( tmp2 ); /* Q15 */
/* Newton-Raphson iteration */ if( rc_Q31 > 0 ) {
rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 ); /* Q15 */ /* Newton-Raphson iteration */
rc_Q31 = silk_LSHIFT32( rc_Q31, 16 ); /* Q31 */ rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 ); /* Q15 */
if( num < 0 ) { rc_Q31 = silk_LSHIFT32( rc_Q31, 16 ); /* Q31 */
/* Ensure adjusted reflection coefficients has the original sign */ if( num < 0 ) {
rc_Q31 = -rc_Q31; /* Ensure adjusted reflection coefficients has the original sign */
rc_Q31 = -rc_Q31;
}
} }
invGain_Q30 = minInvGain_Q30; invGain_Q30 = minInvGain_Q30;
reached_max_gain = 1; reached_max_gain = 1;