acinclude/ac_check_define.m4
author Ryan C. Gordon
Mon, 23 Jan 2017 16:45:50 -0500
changeset 10840 3c3708a0b217
parent 6491 03b7e6b0a8bf
child 14038 2c13b7ca1997
permissions -rw-r--r--
audio: Resampler now special-cases stereo and mono processing.

Turns out that iterating from 0 to channels-1 was a serious performance hit!

These cases now tend to match or beat the original audio resampler's speed!
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AC_DEFUN([AC_CHECK_DEFINE],[dnl
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  AC_CACHE_CHECK(for $1 in $2, ac_cv_define_$1,
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    AC_EGREP_CPP([YES_IS_DEFINED], [
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#include <$2>
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#ifdef $1
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YES_IS_DEFINED
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#endif
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    ], ac_cv_define_$1=yes, ac_cv_define_$1=no)
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  )
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  if test "$ac_cv_define_$1" = "yes" ; then
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    AC_DEFINE([HAVE_$1],[],[Added by AC_CHECK_DEFINE])
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  fi
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])dnl
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AC_DEFINE([HAVE_$1],[],[Added by AC_CHECK_DEFINE])