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Sync with Speex SVN. Syntactic change in filters_cf.S.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15310 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2007-10-26 01:16:55 +00:00
parent 14da611cd3
commit fa971b142d
28 changed files with 375 additions and 484 deletions
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23
apps/codecs/libspeex/math_approx.h
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@ -45,9 +45,21 @@
#define spx_cos_norm(x) (cos((.5f*M_PI)*(x)))
#define spx_atan atan
#endif
/** Generate a pseudo-random number */
static inline spx_word16_t speex_rand(spx_word16_t std, spx_int32_t *seed)
{
const unsigned int jflone = 0x3f800000;
const unsigned int jflmsk = 0x007fffff;
union {int i; float f;} ran;
*seed = 1664525 * *seed + 1013904223;
ran.i = jflone | (jflmsk & *seed);
ran.f -= 1.5;
return 3.4642*std*ran.f;
}
#endif
static inline spx_int16_t spx_ilog2(spx_uint32_t x)
{
@ -106,6 +118,15 @@ static inline spx_int16_t spx_ilog4(spx_uint32_t x)
#ifdef FIXED_POINT
/** Generate a pseudo-random number */
static inline spx_word16_t speex_rand(spx_word16_t std, spx_int32_t *seed)
{
spx_word32_t res;
*seed = 1664525 * *seed + 1013904223;
res = MULT16_16(EXTRACT16(SHR32(*seed,16)),std);
return EXTRACT16(PSHR32(SUB32(res, SHR32(res, 3)),14));
}
/* sqrt(x) ~= 0.22178 + 1.29227*x - 0.77070*x^2 + 0.25723*x^3 (for .25 < x < 1) */
/*#define C0 3634
#define C1 21173