author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 16 Apr 2010 15:15:52 +0300 | |
changeset 8 | 4a7fac7dd34a |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk> |
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* |
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* gstfastrandom.h: Fast, bad PNRG |
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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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#include <glib.h> |
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#ifndef __GST_FAST_RANDOM__ |
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#define __GST_FAST_RANDOM__ |
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/* transform [0..2^32] -> [0..1] */ |
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#define GST_RAND_DOUBLE_TRANSFORM 2.3283064365386962890625e-10 |
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/* This is the base function, implementing a linear congruential generator |
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* and returning a pseudo random number between 0 and 2^32 - 1. |
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*/ |
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static inline guint32 |
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gst_fast_random_uint32 () |
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{ |
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static guint32 state = 0xdeadbeef; |
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return (state = state * 1103515245 + 12345); |
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} |
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static inline guint32 |
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gst_fast_random_uint32_range (gint32 start, gint32 end) |
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{ |
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guint64 tmp = gst_fast_random_uint32 (); |
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tmp = (tmp * (end - start)) / G_MAXUINT32 + start; |
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return (guint32) tmp; |
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} |
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static inline gint32 |
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gst_fast_random_int32 (void) |
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{ |
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return (gint32) gst_fast_random_uint32 (); |
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} |
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static inline gint32 |
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gst_fast_random_int32_range (gint32 start, gint32 end) |
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{ |
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gint64 tmp = gst_fast_random_uint32 (); |
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tmp = (tmp * (end - start)) / G_MAXUINT32 + start; |
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return (gint32) tmp; |
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} |
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static inline gdouble |
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gst_fast_random_double (void) |
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{ |
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gdouble ret; |
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ret = gst_fast_random_uint32 () * GST_RAND_DOUBLE_TRANSFORM; |
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ret = (ret + gst_fast_random_uint32 ()) * GST_RAND_DOUBLE_TRANSFORM; |
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if (ret >= 1.0) |
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return gst_fast_random_double (); |
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return ret; |
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} |
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static inline gdouble |
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gst_fast_random_double_range (gdouble start, gdouble end) |
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{ |
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return gst_fast_random_double () * (end - start) + start; |
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} |
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#undef GST_RAND_DOUBLE_TRANSFORM |
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#endif /* __GST_FAST_RANDOM__ */ |
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