libm alternative in ports
michael.grunewald at laposte.net
Thu Nov 25 16:25:43 UTC 2010
> Alexander Best<arundel at freebsd.org> writes:
>> does anybody if there's an alternative for libm in the ports dir? i need it,
>> because the newest snapshots of mplayer require log2() and log2f(), which the
>> base libm doesn't support.
> for mplayer I'd suggest using code from x264 because both projects use GPLv2+
> #if !HAVE_LOG2F
> #define log2f(x) (logf(x)/0.693147180559945f)
> #define log2(x) (log(x)/0.693147180559945)
In `math.h', there is the following definition:
#define M_LN2 0.69314718055994530942 /* log e2 */
of which you can take advantage for your definition of log2f and log2.
Note that this macro is not described in math(3).
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