1 files changed, 116 insertions, 0 deletions
diff --git a/include/gst/math-compat.h b/include/gst/math-compat.h
new file mode 100644
index 0000000000..fe3fe95153
--- /dev/null
+++ b/include/gst/math-compat.h
@@ -0,0 +1,116 @@
+/* GStreamer
+ * Copyright (C) 2010 Tim-Philipp Müller <tim centricular net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_MATH_COMPAT_H__
+#define __GST_MATH_COMPAT_H__
+
+#ifndef __GI_SCANNER__
+
+/* This header is not included automatically via gst/gst.h, you need to
+ * include it explicitly if you need it. */
+
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES /* so MSVC defines M_PI etc. */
+#endif
+#include <math.h>
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+/* http://en.wikipedia.org/wiki/Math.h */
+
+#define __GST_MATH_COMPAT_NEED_RINT
+#define __GST_MATH_COMPAT_NEED_RINTF
+#define __GST_MATH_COMPAT_NEED_ISNAN
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#undef __GST_MATH_COMPAT_NEED_RINT
+#undef __GST_MATH_COMPAT_NEED_RINTF
+#undef __GST_MATH_COMPAT_NEED_ISNAN
+#endif
+
+#if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
+#undef __GST_MATH_COMPAT_NEED_RINT
+#undef __GST_MATH_COMPAT_NEED_RINTF
+#undef __GST_MATH_COMPAT_NEED_ISNAN
+#endif
+
+#ifndef M_PI
+#define M_PI G_PI
+#endif
+
+#ifndef M_PI_2
+#define M_PI_2 G_PI_2
+#endif
+
+#ifndef M_PI_4
+#define M_PI_4 G_PI_4
+#endif
+
+static inline double
+__gst_math_compat_rint (double x)
+{
+  return floor (x + 0.5);
+}
+
+static inline float
+__gst_math_compat_rintf (float x)
+{
+  return floorf (x + 0.5);
+}
+
+static inline gboolean
+__gst_math_compat_isnan (double x)
+{
+  return x != x;
+}
+
+#if defined (__GST_MATH_COMPAT_NEED_RINT) && !defined (rint)
+#define rint(x) __gst_math_compat_rint(x)
+#endif
+
+#if defined (__GST_MATH_COMPAT_NEED_RINTF) && !defined (rintf)
+#define rintf(x) __gst_math_compat_rintf(x)
+#endif
+
+#if defined (__GST_MATH_COMPAT_NEED_ISNAN) && !defined (isnan)
+#define isnan(x) __gst_math_compat_isnan (x)
+#endif
+
+#ifndef NAN
+#if G_BYTE_ORDER == G_BIG_ENDIAN
+#define __GST_NAN_BYTES        { 0x7f, 0xc0, 0, 0 }
+#elif G_BYTE_ORDER == G_LITTLE_ENDIAN
+#define __GST_NAN_BYTES        { 0, 0, 0xc0, 0x7f }
+#endif
+static union {
+  unsigned char __c[4];
+  float __d;
+} __gst_nan_union G_GNUC_UNUSED = {
+  __GST_NAN_BYTES
+};
+#define NAN    (__gst_nan_union.__d)
+#endif
+
+G_END_DECLS
+
+#endif /* !__GI_SCANNER__ */
+
+#endif /* __GST_MATH_COMPAT_H__ */