Convert default resampler from libresample to libsoxr.

lib-src/libsoxr/src/rint.h

@@ -0,0 +1,68 @@
+/* SoX Resampler Library      Copyright (c) 2007-12 robs@users.sourceforge.net
+ * Licence for this file: LGPL v2.1                  See LICENCE for details. */
+
+#if !defined soxr_rint_included
+#define soxr_rint_included
+
+#include "soxr-config.h"
+
+
+
+#if HAVE_LRINT && LONG_MAX == 2147483647L
+  #include <math.h>
+  #define FPU_RINT32
+  #define rint32 lrint
+#elif defined __GNUC__ && (defined __i386__ || defined __x86_64__)
+  #define FPU_RINT32
+  static __inline int32_t rint32(double input) {
+    int32_t result;
+    __asm__ __volatile__("fistpl %0": "=m"(result): "t"(input): "st");
+    return result;
+  }
+#elif defined __GNUC__ && defined __arm__
+  #define FPU_RINT32
+  static __inline int32_t rint32(double input) {
+    register int32_t result;
+    __asm__ __volatile__ ("ftosid %0, %P1": "=w"(result): "w"(input));
+    return result;
+  }
+#elif defined _MSC_VER && defined _M_IX86
+  #define FPU_RINT32
+  static __inline int32_t rint32(double input) {
+    int32_t result;
+    _asm {
+      fld input
+      fistp result
+    }
+    return result;
+  }
+#else
+  #define rint32(x) (int32_t)((x) < 0? x - .5 : x + .5)
+#endif
+
+
+
+#if defined __GNUC__ && (defined __i386__ || defined __x86_64__)
+  #define FPU_RINT16
+  static __inline int16_t rint16(double input) {
+    int16_t result;
+    __asm__ __volatile__("fistps %0": "=m"(result): "t"(input): "st");
+    return result;
+  }
+#elif defined _MSC_VER && defined _M_IX86
+  #define FPU_RINT16
+  static __inline int16_t rint16(double input) {
+    int16_t result;
+    _asm {
+      fld input
+      fistp result
+    }
+    return result;
+  }
+#else
+  #define rint16(x) (int16_t)floor((x)+.5) /* Is this faster than in rint32? */
+#endif
+
+
+
+#endif