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fixed-point: conversion of pre-echo avoidance now complete.

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This commit is contained in:
Jean-Marc Valin 2008-07-04 16:47:28 -04:00
parent 0ceccb2dbd
commit f457819668
1 changed files with 29 additions and 2 deletions
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31
libcelt/celt.c
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@ -164,13 +164,36 @@ static inline celt_int16_t SIG2INT16(celt_sig_t x)
return (celt_int16_t)floor(.5+x);
#endif
}
#ifdef FIXED_POINT
static int ratio_compare(celt_word32_t num1, celt_word32_t den1, celt_word32_t num2, celt_word32_t den2)
{
int shift = celt_zlog2(MAX32(num1, num2));
if (shift > 14)
{
num1 = SHR32(num1, shift-14);
num2 = SHR32(num2, shift-14);
}
shift = celt_zlog2(MAX32(den1, den2));
if (shift > 14)
{
den1 = SHR32(den1, shift-14);
den2 = SHR32(den2, shift-14);
}
return MULT16_16(EXTRACT16(num1),EXTRACT16(den2)) > MULT16_16(EXTRACT16(den1),EXTRACT16(num2));
}
#else
static int ratio_compare(celt_word32_t num1, celt_word32_t den1, celt_word32_t num2, celt_word32_t den2)
{
return num1*den2 > den1*num2;
}
#endif
static int transient_analysis(celt_word32_t *in, int len, int C, celt_word32_t *r)
{
int c, i, n;
celt_word32_t ratio;
/* FIXME: Remove the floats here */
float maxN, maxD;
celt_word32_t maxN, maxD;
VARDECL(celt_word32_t, begin);
SAVE_STACK;
ALLOC(begin, len, celt_word32_t);
@ -195,7 +218,7 @@ static int transient_analysis(celt_word32_t *in, int len, int C, celt_word32_t *
endi = begin[len-1]-begin[i];
num = endi*i;
den = (30+begin[i])*(len-i)+MULT16_32_Q15(QCONST16(.1f,15),endi)*len;
if ((num*maxD > den*maxN) && (endi > MULT16_32_Q15(QCONST16(.05f,15),begin[i])))
if (ratio_compare(num, den, maxN, maxD) && (endi > MULT16_32_Q15(QCONST16(.05f,15),begin[i])))
{
maxN = num;
maxD = den;
@ -208,6 +231,10 @@ static int transient_analysis(celt_word32_t *in, int len, int C, celt_word32_t *
n = -1;
ratio = 0;
}
if (ratio < 0)
ratio = 0;
if (ratio > 1000)
ratio = 1000;
*r = ratio*ratio;
RESTORE_STACK;
return n;