author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 30 | 7e817e7e631c |
parent 29 | 567bb019e3e3 |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu> |
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* Library <2002> Steve Baker <stevebaker_org@yahoo.co.uk> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public |
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* License along with this library; if not, write to the |
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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* Boston, MA 02111-1307, USA. |
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*/ |
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|
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/** |
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* SECTION:gstfloatcast |
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* @short_description: Floating point platform independence macros |
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* |
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* The floatcast.h header file contains a couple of convenience macros for |
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* floating point numbers. |
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* |
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* If you include this header, your application or library must link against |
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* libm (for maths.h support). |
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* |
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* For optimal results, your application's or library's build |
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* system should check whether the C99 functions lrint and lrintf are supported |
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* and define the preprocessor symbols HAVE_LRINT and HAVE_LRINTF if so. If |
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* you are using autoconf, you can do this by using the AC_C99_FUNC_LRINT and |
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* AC_C99_FUNC_LRINTF checks in your configure.ac or configure.in file and |
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* including your application's config.h header before you include floatcast.h. |
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*/ |
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#ifndef __FLOATCAST_H__ |
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#define __FLOATCAST_H__ |
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#include <string.h> |
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#include <glib/gtypes.h> |
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#include <glib/gutils.h> /* to make sure inline is defined properly */ |
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#if defined (_MSC_VER) && !defined (inline) |
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#define inline __inline |
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#endif |
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G_BEGIN_DECLS |
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/* FIXME 0.11: these gst_cast_*() functions are not used anywhere, so we could |
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* just as well get rid of them and move the float/double swap macros into |
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* gstutils.h in core */ |
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/** |
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* gst_cast_float: |
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* @x: input value |
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* |
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* Casts a 32-bit floating point value (float) to an integer without bias. |
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*/ |
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/** |
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* gst_cast_double: |
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* @x: input value |
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* |
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* Casts a 64-bit floating point value (double) to an integer without bias. |
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*/ |
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/* FIXME: HAVE_LRINT && HAVE_LRINTF are defined by config.h - they should |
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* not be used in an installed header. */ |
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#if defined(HAVE_LRINT) && defined(HAVE_LRINTF) |
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/* These defines enable functionality introduced with the 1999 ISO C |
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** standard. They must be defined before the inclusion of math.h to |
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** engage them. If optimisation is enabled, these functions will be |
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** inlined. With optimisation switched off, you have to link in the |
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** maths library using -lm. |
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*/ |
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#define _ISOC9X_SOURCE 1 |
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#define _ISOC99_SOURCE 1 |
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#define __USE_ISOC9X 1 |
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#define __USE_ISOC99 1 |
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#include <math.h> |
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#define gst_cast_float(x) ((gint)lrintf(x)) |
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#define gst_cast_double(x) ((gint)lrint(x)) |
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#else |
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#include <math.h> |
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/* use a standard c cast, but do rounding correctly */ |
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#define gst_cast_float(x) ((gint)floor((x)+0.5)) |
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#define gst_cast_double(x) ((gint)floor((x)+0.5)) |
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#endif |
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/* FIXME 0.11: don't use GLib namespace (GDOUBLE_SWAP_LE_BE, GFLOAT_TO_LE, |
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* GFLOAT_TO_BE, GDOUBLE_TO_LE, GDOUBLE_TO_BE) */ |
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/** |
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* GFLOAT_SWAP_LE_BE: |
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* @in: input value |
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* |
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* Swap byte order of a 32-bit floating point value (float). |
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*/ |
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inline static gfloat |
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GFLOAT_SWAP_LE_BE(gfloat in) |
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{ |
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union |
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{ |
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guint32 i; |
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gfloat f; |
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} u; |
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u.f = in; |
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u.i = GUINT32_SWAP_LE_BE (u.i); |
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return u.f; |
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} |
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/** |
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* GDOUBLE_SWAP_LE_BE: |
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* @in: input value |
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* |
|
127 |
* Swap byte order of a 64-bit floating point value (double). |
|
128 |
*/ |
|
129 |
inline static gdouble |
|
130 |
GDOUBLE_SWAP_LE_BE(gdouble in) |
|
131 |
{ |
|
132 |
union |
|
133 |
{ |
|
134 |
guint64 i; |
|
135 |
gdouble d; |
|
136 |
} u; |
|
137 |
||
138 |
u.d = in; |
|
139 |
u.i = GUINT64_SWAP_LE_BE (u.i); |
|
140 |
return u.d; |
|
141 |
} |
|
142 |
||
143 |
/** |
|
144 |
* GDOUBLE_TO_LE: |
|
145 |
* @val: value |
|
146 |
* |
|
147 |
* Convert 64-bit floating point value (double) from native byte order into |
|
148 |
* little endian byte order. |
|
149 |
*/ |
|
150 |
/** |
|
151 |
* GDOUBLE_TO_BE: |
|
152 |
* @val: value |
|
153 |
* |
|
154 |
* Convert 64-bit floating point value (double) from native byte order into |
|
155 |
* big endian byte order. |
|
156 |
*/ |
|
157 |
/** |
|
158 |
* GDOUBLE_FROM_LE: |
|
159 |
* @val: value |
|
160 |
* |
|
161 |
* Convert 64-bit floating point value (double) from little endian byte order |
|
162 |
* into native byte order. |
|
163 |
*/ |
|
164 |
/** |
|
165 |
* GDOUBLE_FROM_BE: |
|
166 |
* @val: value |
|
167 |
* |
|
168 |
* Convert 64-bit floating point value (double) from big endian byte order |
|
169 |
* into native byte order. |
|
170 |
*/ |
|
171 |
||
172 |
/** |
|
173 |
* GFLOAT_TO_LE: |
|
174 |
* @val: value |
|
175 |
* |
|
176 |
* Convert 32-bit floating point value (float) from native byte order into |
|
177 |
* little endian byte order. |
|
178 |
*/ |
|
179 |
/** |
|
180 |
* GFLOAT_TO_BE: |
|
181 |
* @val: value |
|
182 |
* |
|
183 |
* Convert 32-bit floating point value (float) from native byte order into |
|
184 |
* big endian byte order. |
|
185 |
*/ |
|
186 |
/** |
|
187 |
* GFLOAT_FROM_LE: |
|
188 |
* @val: value |
|
189 |
* |
|
190 |
* Convert 32-bit floating point value (float) from little endian byte order |
|
191 |
* into native byte order. |
|
192 |
*/ |
|
193 |
/** |
|
194 |
* GFLOAT_FROM_BE: |
|
195 |
* @val: value |
|
196 |
* |
|
197 |
* Convert 32-bit floating point value (float) from big endian byte order |
|
198 |
* into native byte order. |
|
199 |
*/ |
|
200 |
||
201 |
#if G_BYTE_ORDER == G_LITTLE_ENDIAN |
|
202 |
#define GFLOAT_TO_LE(val) ((gfloat) (val)) |
|
203 |
#define GFLOAT_TO_BE(val) (GFLOAT_SWAP_LE_BE (val)) |
|
204 |
#define GDOUBLE_TO_LE(val) ((gdouble) (val)) |
|
205 |
#define GDOUBLE_TO_BE(val) (GDOUBLE_SWAP_LE_BE (val)) |
|
206 |
||
207 |
#elif G_BYTE_ORDER == G_BIG_ENDIAN |
|
208 |
#define GFLOAT_TO_LE(val) (GFLOAT_SWAP_LE_BE (val)) |
|
209 |
#define GFLOAT_TO_BE(val) ((gfloat) (val)) |
|
210 |
#define GDOUBLE_TO_LE(val) (GDOUBLE_SWAP_LE_BE (val)) |
|
211 |
#define GDOUBLE_TO_BE(val) ((gdouble) (val)) |
|
212 |
||
213 |
#else /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */ |
|
214 |
#error unknown ENDIAN type |
|
215 |
#endif /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */ |
|
216 |
||
217 |
#define GFLOAT_FROM_LE(val) (GFLOAT_TO_LE (val)) |
|
218 |
#define GFLOAT_FROM_BE(val) (GFLOAT_TO_BE (val)) |
|
219 |
#define GDOUBLE_FROM_LE(val) (GDOUBLE_TO_LE (val)) |
|
220 |
#define GDOUBLE_FROM_BE(val) (GDOUBLE_TO_BE (val)) |
|
221 |
||
0
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
222 |
G_END_DECLS |
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parents:
diff
changeset
|
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|
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
224 |
#endif /* __FLOATCAST_H__ */ |
0e761a78d257
Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
225 |