--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst-libs/gst/floatcast/floatcast.h Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,225 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Library <2002> Steve Baker <stevebaker_org@yahoo.co.uk>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstfloatcast
+ * @short_description: Floating point platform independence macros
+ *
+ * The floatcast.h header file contains a couple of convenience macros for
+ * floating point numbers.
+ *
+ * If you include this header, your application or library must link against
+ * libm (for maths.h support).
+ *
+ * For optimal results, your application's or library's build
+ * system should check whether the C99 functions lrint and lrintf are supported
+ * and define the preprocessor symbols HAVE_LRINT and HAVE_LRINTF if so. If
+ * you are using autoconf, you can do this by using the AC_C99_FUNC_LRINT and
+ * AC_C99_FUNC_LRINTF checks in your configure.ac or configure.in file and
+ * including your application's config.h header before you include floatcast.h.
+ */
+
+#ifndef __FLOATCAST_H__
+#define __FLOATCAST_H__
+
+#include <string.h>
+#include <glib/gtypes.h>
+#include <glib/gutils.h> /* to make sure inline is defined properly */
+
+#if defined (_MSC_VER) && !defined (inline)
+#define inline __inline
+#endif
+
+G_BEGIN_DECLS
+
+/* FIXME 0.11: these gst_cast_*() functions are not used anywhere, so we could
+ * just as well get rid of them and move the float/double swap macros into
+ * gstutils.h in core */
+
+/**
+ * gst_cast_float:
+ * @x: input value
+ *
+ * Casts a 32-bit floating point value (float) to an integer without bias.
+ */
+/**
+ * gst_cast_double:
+ * @x: input value
+ *
+ * Casts a 64-bit floating point value (double) to an integer without bias.
+ */
+
+/* FIXME: HAVE_LRINT && HAVE_LRINTF are defined by config.h - they should
+ * not be used in an installed header. */
+#if defined(HAVE_LRINT) && defined(HAVE_LRINTF)
+
+ /* These defines enable functionality introduced with the 1999 ISO C
+ ** standard. They must be defined before the inclusion of math.h to
+ ** engage them. If optimisation is enabled, these functions will be
+ ** inlined. With optimisation switched off, you have to link in the
+ ** maths library using -lm.
+ */
+
+ #define _ISOC9X_SOURCE 1
+ #define _ISOC99_SOURCE 1
+
+ #define __USE_ISOC9X 1
+ #define __USE_ISOC99 1
+
+ #include <math.h>
+
+ #define gst_cast_float(x) ((gint)lrintf(x))
+ #define gst_cast_double(x) ((gint)lrint(x))
+
+#else
+ #include <math.h>
+
+ /* use a standard c cast, but do rounding correctly */
+ #define gst_cast_float(x) ((gint)floor((x)+0.5))
+ #define gst_cast_double(x) ((gint)floor((x)+0.5))
+
+#endif
+
+/* FIXME 0.11: don't use GLib namespace (GDOUBLE_SWAP_LE_BE, GFLOAT_TO_LE,
+ * GFLOAT_TO_BE, GDOUBLE_TO_LE, GDOUBLE_TO_BE) */
+
+/**
+ * GFLOAT_SWAP_LE_BE:
+ * @in: input value
+ *
+ * Swap byte order of a 32-bit floating point value (float).
+ */
+inline static gfloat
+GFLOAT_SWAP_LE_BE(gfloat in)
+{
+ union
+ {
+ guint32 i;
+ gfloat f;
+ } u;
+
+ u.f = in;
+ u.i = GUINT32_SWAP_LE_BE (u.i);
+ return u.f;
+}
+
+/**
+ * GDOUBLE_SWAP_LE_BE:
+ * @in: input value
+ *
+ * Swap byte order of a 64-bit floating point value (double).
+ */
+inline static gdouble
+GDOUBLE_SWAP_LE_BE(gdouble in)
+{
+ union
+ {
+ guint64 i;
+ gdouble d;
+ } u;
+
+ u.d = in;
+ u.i = GUINT64_SWAP_LE_BE (u.i);
+ return u.d;
+}
+
+/**
+ * GDOUBLE_TO_LE:
+ * @val: value
+ *
+ * Convert 64-bit floating point value (double) from native byte order into
+ * little endian byte order.
+ */
+/**
+ * GDOUBLE_TO_BE:
+ * @val: value
+ *
+ * Convert 64-bit floating point value (double) from native byte order into
+ * big endian byte order.
+ */
+/**
+ * GDOUBLE_FROM_LE:
+ * @val: value
+ *
+ * Convert 64-bit floating point value (double) from little endian byte order
+ * into native byte order.
+ */
+/**
+ * GDOUBLE_FROM_BE:
+ * @val: value
+ *
+ * Convert 64-bit floating point value (double) from big endian byte order
+ * into native byte order.
+ */
+
+/**
+ * GFLOAT_TO_LE:
+ * @val: value
+ *
+ * Convert 32-bit floating point value (float) from native byte order into
+ * little endian byte order.
+ */
+/**
+ * GFLOAT_TO_BE:
+ * @val: value
+ *
+ * Convert 32-bit floating point value (float) from native byte order into
+ * big endian byte order.
+ */
+/**
+ * GFLOAT_FROM_LE:
+ * @val: value
+ *
+ * Convert 32-bit floating point value (float) from little endian byte order
+ * into native byte order.
+ */
+/**
+ * GFLOAT_FROM_BE:
+ * @val: value
+ *
+ * Convert 32-bit floating point value (float) from big endian byte order
+ * into native byte order.
+ */
+
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+#define GFLOAT_TO_LE(val) ((gfloat) (val))
+#define GFLOAT_TO_BE(val) (GFLOAT_SWAP_LE_BE (val))
+#define GDOUBLE_TO_LE(val) ((gdouble) (val))
+#define GDOUBLE_TO_BE(val) (GDOUBLE_SWAP_LE_BE (val))
+
+#elif G_BYTE_ORDER == G_BIG_ENDIAN
+#define GFLOAT_TO_LE(val) (GFLOAT_SWAP_LE_BE (val))
+#define GFLOAT_TO_BE(val) ((gfloat) (val))
+#define GDOUBLE_TO_LE(val) (GDOUBLE_SWAP_LE_BE (val))
+#define GDOUBLE_TO_BE(val) ((gdouble) (val))
+
+#else /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
+#error unknown ENDIAN type
+#endif /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
+
+#define GFLOAT_FROM_LE(val) (GFLOAT_TO_LE (val))
+#define GFLOAT_FROM_BE(val) (GFLOAT_TO_BE (val))
+#define GDOUBLE_FROM_LE(val) (GDOUBLE_TO_LE (val))
+#define GDOUBLE_FROM_BE(val) (GDOUBLE_TO_BE (val))
+
+G_END_DECLS
+
+#endif /* __FLOATCAST_H__ */
+