Check for the presence of llrint(), lrint(), round() and roundf()

and provide simple replacements if they are unavailable.
patch by Michael Kostylev, mik niipt ru

Originally committed as revision 11326 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -706,6 +706,8 @@ HAVE_LIST="
     getrusage
     imlib2
     inet_aton
+    llrint
+    lrint
     lrintf
     machine_ioctl_bt848_h
     machine_ioctl_meteor_h
@@ -714,6 +716,8 @@ HAVE_LIST="
     mkstemp
     mlib
     ppc64
+    round
+    roundf
     sdl
     sdl_video_size
     soundcard_h
@@ -1593,12 +1597,14 @@ done
 
 check_lib math.h sin -lm
 
-# test for lrintf in math.h
-check_exec <<EOF && enable lrintf || disable lrintf
+# test for C99 functions in math.h
+for func in llrint lrint lrintf round roundf; do
+    check_exec <<EOF && enable $func || disable $func
 #define _ISOC9X_SOURCE  1
 #include <math.h>
-int main(void) { return (lrintf(3.999f) > 0)?0:1; }
+int main(void) { return ($func(3.999f) > 0)?0:1; }
 EOF
+done
 
 enabled_any libamr_nb libamr_wb && enable libamr
 

libavutil/internal.h

@@ -270,6 +270,20 @@ if((y)<(x)){\
     }\
 }
 
+#ifndef HAVE_LLRINT
+static av_always_inline long long llrint(double x)
+{
+    return rint(x);
+}
+#endif /* HAVE_LLRINT */
+
+#ifndef HAVE_LRINT
+static av_always_inline long int lrint(double x)
+{
+    return rint(x);
+}
+#endif /* HAVE_LRINT */
+
 #ifndef HAVE_LRINTF
 static av_always_inline long int lrintf(float x)
 {
@@ -277,4 +291,18 @@ static av_always_inline long int lrintf(float x)
 }
 #endif /* HAVE_LRINTF */
 
+#ifndef HAVE_ROUND
+static av_always_inline double round(double x)
+{
+    return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
+}
+#endif /* HAVE_ROUND */
+
+#ifndef HAVE_ROUNDF
+static av_always_inline float roundf(float x)
+{
+    return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
+}
+#endif /* HAVE_ROUNDF */
+
 #endif /* FFMPEG_INTERNAL_H */