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tablegen: Don't use cbrtf in host tools

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You cannot count on them being present on all systems, and you
cannot include libm.h in a host tool, so just hard code baseline
implementations.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Derek Buitenhuis 2013-01-15 16:28:03 -05:00
parent 00aa24ffee
commit 008014b5e7
2 changed files with 6 additions and 3 deletions
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3
libavcodec/cbrt_tablegen.h
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@ -36,12 +36,13 @@ static void cbrt_tableinit(void)
{
if (!cbrt_tab[(1<<13) - 1]) {
int i;
/* cbrtf() isn't available on all systems, so we use powf(). */
for (i = 0; i < 1<<13; i++) {
union {
float f;
uint32_t i;
} f;
f.f = cbrtf(i) * i;
f.f = powf(i, 1.0 / 3.0) * i;
cbrt_tab[i] = f.i;
}
}

6
libavcodec/mpegaudio_tablegen.h
View File

@ -48,7 +48,8 @@ static void mpegaudio_tableinit(void)
double value = i / 4;
double f, fm;
int e, m;
f = value / IMDCT_SCALAR * cbrtf(value) * pow(2, (i & 3) * 0.25);
/* cbrtf() isn't available on all systems, so we use powf(). */
f = value / IMDCT_SCALAR * powf(value, 1.0 / 3.0) * pow(2, (i & 3) * 0.25);
fm = frexp(f, &e);
m = (uint32_t)(fm * (1LL << 31) + 0.5);
e += FRAC_BITS - 31 + 5 - 100;
@ -59,7 +60,8 @@ static void mpegaudio_tableinit(void)
}
for (exponent = 0; exponent < 512; exponent++) {
for (value = 0; value < 16; value++) {
double f = (double)value * cbrtf(value) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR;
/* cbrtf() isn't available on all systems, so we use powf(). */
double f = (double)value * powf(value, 1.0 / 3.0) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR;
expval_table_fixed[exponent][value] = llrint(f);
expval_table_float[exponent][value] = f;
}