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This should prevent a rare divide-by-zero in the pitch gain code

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Jean-Marc Valin 2009-10-20 07:13:35 -04:00
parent bd5d54adb8
commit a3bba38b49
1 changed files with 4 additions and 2 deletions
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6
libcelt/bands.c
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@ -262,12 +262,14 @@ int compute_pitch_gain(const CELTMode *m, const celt_sig *X, const celt_sig *P,
fact = QCONST16(1., 14); fact = QCONST16(1., 14);
num = Sxy; num = Sxy;
den = EPSILON+Sxx+MULT16_32_Q15(QCONST16(.03,15),Syy); den = EPSILON+Sxx+MULT16_32_Q15(QCONST16(.03,15),Syy);
shift = celt_ilog2(Sxy)-16; shift = celt_zlog2(Sxy)-16;
if (shift < 0) if (shift < 0)
shift = 0; shift = 0;
g = DIV32(SHL32(SHR32(num,shift),14),SHR32(den,shift));
if (Sxy < MULT16_32_Q15(fact, MULT16_16(celt_sqrt(EPSILON+Sxx),celt_sqrt(EPSILON+Syy)))) if (Sxy < MULT16_32_Q15(fact, MULT16_16(celt_sqrt(EPSILON+Sxx),celt_sqrt(EPSILON+Syy))))
g = 0; g = 0;
else
g = DIV32(SHL32(SHR32(num,shift),14),ADD32(EPSILON,SHR32(den,shift)));
/* This MUST round down so that we don't over-estimate the gain */ /* This MUST round down so that we don't over-estimate the gain */
*gain_id = EXTRACT16(SHR32(MULT16_16(20,(g-QCONST16(.5,14))),14)); *gain_id = EXTRACT16(SHR32(MULT16_16(20,(g-QCONST16(.5,14))),14));
} }