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g723.1: deobfuscate an expression

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(x << 2) - x is just an optimisation of 3 * x the compiler is
perfectly capable of doing on its own.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-08-10 00:13:46 +01:00
parent e2b7c5783d
commit e141cf2c57
1 changed files with 1 additions and 2 deletions
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libavcodec/g723_1.c
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@ -974,8 +974,7 @@ static void formant_postfilter(G723_1_Context *p, int16_t *lpc, int16_t *buf)
if (temp) {
temp = (auto_corr[0] >> 2) / temp;
}
p->reflection_coef = ((p->reflection_coef << 2) - p->reflection_coef +
temp + 2) >> 2;
p->reflection_coef = (3 * p->reflection_coef + temp + 2) >> 2;
temp = (p->reflection_coef * 0xffffc >> 3) & 0xfffc;
/* Compensation filter */