dep: Add libsamplerate

dep/libsamplerate/cmake/ClipMode.cmake

@@ -0,0 +1,81 @@
+macro(CLIP_MODE)
+
+  set(CLIP_MODE_POSITIVE_MESSAGE "Target processor clips on positive float to int conversion")
+  set(CLIP_MODE_NEGATIVE_MESSAGE "Target processor clips on negative float to int conversion")
+
+  message(STATUS "Checking processor clipping capabilities...")
+
+  if(CMAKE_CROSSCOMPILING)
+
+    set(CLIP_MSG "disabled")
+    set(CPU_CLIPS_POSITIVE FALSE CACHE BOOL ${CLIP_MODE_POSITIVE_MESSAGE})
+    set(CPU_CLIPS_NEGATIVE FALSE CACHE BOOL ${CLIP_MODE_NEGATIVE_MESSAGE})
+
+  else()
+      include(CheckCSourceRuns)
+      include(CMakePushCheckState)
+      cmake_push_check_state(RESET)
+
+      if(MATH_LIBRARY)
+        list(APPEND CMAKE_REQUIRED_LIBRARIES ${MATH_LIBRARY})
+      endif()
+
+      check_c_source_runs(
+      "
+      #include <math.h>
+      int main (void)
+      {   double  fval ;
+          int k, ival ;
+
+          fval = 1.0 * 0x7FFFFFFF ;
+          for (k = 0 ; k < 100 ; k++)
+          {   ival = (lrint (fval)) >> 24 ;
+              if (ival != 127)
+                  return 1 ;
+
+              fval *= 1.2499999 ;
+              } ;
+
+              return 0 ;
+          }
+      "
+      CPU_CLIPS_POSITIVE)
+
+      check_c_source_runs(
+        "
+        #include <math.h>
+        int main (void)
+        {   double  fval ;
+            int k, ival ;
+
+            fval = -8.0 * 0x10000000 ;
+            for (k = 0 ; k < 100 ; k++)
+            {   ival = (lrint (fval)) >> 24 ;
+                if (ival != -128)
+                    return 1 ;
+
+                fval *= 1.2499999 ;
+                } ;
+
+                return 0 ;
+            }
+        "
+        CPU_CLIPS_NEGATIVE)
+
+      cmake_pop_check_state()
+
+      if(CPU_CLIPS_POSITIVE AND CPU_CLIPS_NEGATIVE)
+          set(CLIP_MSG "both")
+      elseif(CPU_CLIPS_POSITIVE)
+          set(CLIP_MSG "positive")
+      elseif(CPU_CLIPS_NEGATIVE)
+          set(CLIP_MSG "negative")
+      else()
+          set(CLIP_MSG "none")
+      endif()
+
+  endif()
+
+  message(STATUS "Checking processor clipping capabilities... ${CLIP_MSG}")
+
+endmacro()