diff -r 567bb019e3e3 -r 7e817e7e631c gst_plugins_base/gst/audioconvert/gstfastrandom.h --- a/gst_plugins_base/gst/audioconvert/gstfastrandom.h Tue Aug 31 15:30:33 2010 +0300 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,90 +0,0 @@ -/* GStreamer - * Copyright (C) 2008 Sebastian Dröge - * - * gstfastrandom.h: Fast, bad PNRG - * - * 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. - */ - -#include - -#ifndef __GST_FAST_RANDOM__ -#define __GST_FAST_RANDOM__ - -/* transform [0..2^32] -> [0..1] */ -#define GST_RAND_DOUBLE_TRANSFORM 2.3283064365386962890625e-10 - -/* This is the base function, implementing a linear congruential generator - * and returning a pseudo random number between 0 and 2^32 - 1. - */ -static inline guint32 -gst_fast_random_uint32 () -{ - static guint32 state = 0xdeadbeef; - - return (state = state * 1103515245 + 12345); -} - -static inline guint32 -gst_fast_random_uint32_range (gint32 start, gint32 end) -{ - guint64 tmp = gst_fast_random_uint32 (); - - tmp = (tmp * (end - start)) / G_MAXUINT32 + start; - - return (guint32) tmp; -} - -static inline gint32 -gst_fast_random_int32 (void) -{ - return (gint32) gst_fast_random_uint32 (); -} - -static inline gint32 -gst_fast_random_int32_range (gint32 start, gint32 end) -{ - gint64 tmp = gst_fast_random_uint32 (); - - tmp = (tmp * (end - start)) / G_MAXUINT32 + start; - - return (gint32) tmp; -} - -static inline gdouble -gst_fast_random_double (void) -{ - gdouble ret; - - ret = gst_fast_random_uint32 () * GST_RAND_DOUBLE_TRANSFORM; - ret = (ret + gst_fast_random_uint32 ()) * GST_RAND_DOUBLE_TRANSFORM; - - if (ret >= 1.0) - return gst_fast_random_double (); - - return ret; -} - -static inline gdouble -gst_fast_random_double_range (gdouble start, gdouble end) -{ - return gst_fast_random_double () * (end - start) + start; -} - -#undef GST_RAND_DOUBLE_TRANSFORM - -#endif /* __GST_FAST_RANDOM__ */ -