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a745fc3757
added libraries: opus flac libsndfile updated: libvorbis libogg openal - Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.
124 lines
2.3 KiB
Text
124 lines
2.3 KiB
Text
dnl @synopsis MN_C_CLIP_MODE
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dnl
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dnl Determine the clipping mode when converting float to int.
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dnl @version 1.0 May 17 2003
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dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
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dnl
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dnl Permission to use, copy, modify, distribute, and sell this file for any
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dnl purpose is hereby granted without fee, provided that the above copyright
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dnl and this permission notice appear in all copies. No representations are
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dnl made about the suitability of this software for any purpose. It is
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dnl provided "as is" without express or implied warranty.
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dnl Find the clipping mode in the following way:
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dnl 1) If we are not cross compiling test it.
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dnl 2) IF we are cross compiling, assume that clipping isn't done correctly.
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AC_DEFUN([MN_C_CLIP_MODE],
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[AC_CACHE_CHECK(processor clipping capabilities,
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ac_cv_c_clip_type,
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# Initialize to unknown
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ac_cv_c_clip_positive=unknown
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ac_cv_c_clip_negative=unknown
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if test $ac_cv_c_clip_positive = unknown ; then
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AC_TRY_RUN(
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[[
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#define _ISOC9X_SOURCE 1
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#define _ISOC99_SOURCE 1
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#define __USE_ISOC99 1
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#define __USE_ISOC9X 1
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#include <math.h>
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int main (void)
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{ double fval ;
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int k, ival ;
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fval = 1.0 * 0x7FFFFFFF ;
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for (k = 0 ; k < 100 ; k++)
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{ ival = (lrint (fval)) >> 24 ;
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if (ival != 127)
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return 1 ;
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fval *= 1.2499999 ;
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} ;
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return 0 ;
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}
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]],
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ac_cv_c_clip_positive=yes,
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ac_cv_c_clip_positive=no,
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ac_cv_c_clip_positive=unknown
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)
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AC_TRY_RUN(
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[[
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#define _ISOC9X_SOURCE 1
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#define _ISOC99_SOURCE 1
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#define __USE_ISOC99 1
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#define __USE_ISOC9X 1
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#include <math.h>
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int main (void)
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{ double fval ;
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int k, ival ;
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fval = -8.0 * 0x10000000 ;
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for (k = 0 ; k < 100 ; k++)
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{ ival = (lrint (fval)) >> 24 ;
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if (ival != -128)
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return 1 ;
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fval *= 1.2499999 ;
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} ;
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return 0 ;
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}
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]],
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ac_cv_c_clip_negative=yes,
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ac_cv_c_clip_negative=no,
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ac_cv_c_clip_negative=unknown
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)
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fi
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if test $ac_cv_c_clip_positive = yes ; then
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ac_cv_c_clip_positive=1
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else
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ac_cv_c_clip_positive=0
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fi
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if test $ac_cv_c_clip_negative = yes ; then
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ac_cv_c_clip_negative=1
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else
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ac_cv_c_clip_negative=0
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fi
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[[
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case "$ac_cv_c_clip_positive$ac_cv_c_clip_negative" in
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"00")
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ac_cv_c_clip_type="none"
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;;
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"10")
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ac_cv_c_clip_type="positive"
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;;
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"01")
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ac_cv_c_clip_type="negative"
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;;
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"11")
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ac_cv_c_clip_type="both"
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;;
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esac
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]]
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)
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]
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)# MN_C_CLIP_MODE
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