* #27232: jni: added pjproject checkout as regular git content
We will remove it once the next release of pjsip (with Android support)
comes out and is merged into SFLphone.
diff --git a/jni/pjproject-android/pjlib/include/pj/math.h b/jni/pjproject-android/pjlib/include/pj/math.h
new file mode 100644
index 0000000..22f3e4d
--- /dev/null
+++ b/jni/pjproject-android/pjlib/include/pj/math.h
@@ -0,0 +1,197 @@
+/* $Id: math.h 3553 2011-05-05 06:14:19Z nanang $ */
+/*
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __PJ_MATH_H__
+#define __PJ_MATH_H__
+
+/**
+ * @file math.h
+ * @brief Mathematics and Statistics.
+ */
+
+#include <pj/string.h>
+#include <pj/compat/high_precision.h>
+
+PJ_BEGIN_DECL
+
+/**
+ * @defgroup pj_math Mathematics and Statistics
+ * @ingroup PJ_MISC
+ * @{
+ *
+ * Provides common mathematics constants and operations, and also standard
+ * statistics calculation (min, max, mean, standard deviation). Statistics
+ * calculation is done in realtime (statistics state is updated on time each
+ * new sample comes).
+ */
+
+/**
+ * Mathematical constants
+ */
+#define PJ_PI 3.14159265358979323846 /* pi */
+#define PJ_1_PI 0.318309886183790671538 /* 1/pi */
+
+/**
+ * Mathematical macro
+ */
+#define PJ_ABS(x) ((x) > 0 ? (x) : -(x))
+#define PJ_MAX(x, y) ((x) > (y)? (x) : (y))
+#define PJ_MIN(x, y) ((x) < (y)? (x) : (y))
+
+/**
+ * This structure describes statistics state.
+ */
+typedef struct pj_math_stat
+{
+ int n; /* number of samples */
+ int max; /* maximum value */
+ int min; /* minimum value */
+ int last; /* last value */
+ int mean; /* mean */
+
+ /* Private members */
+#if PJ_HAS_FLOATING_POINT
+ float fmean_; /* mean(floating point) */
+#else
+ int mean_res_; /* mean residu */
+#endif
+ pj_highprec_t m2_; /* variance * n */
+} pj_math_stat;
+
+/**
+ * Calculate integer square root of an integer.
+ *
+ * @param i Integer to be calculated.
+ *
+ * @return Square root result.
+ */
+PJ_INLINE(unsigned) pj_isqrt(unsigned i)
+{
+ unsigned res = 1, prev;
+
+ /* Rough guess, calculate half bit of input */
+ prev = i >> 2;
+ while (prev) {
+ prev >>= 2;
+ res <<= 1;
+ }
+
+ /* Babilonian method */
+ do {
+ prev = res;
+ res = (prev + i/prev) >> 1;
+ } while ((prev+res)>>1 != res);
+
+ return res;
+}
+
+/**
+ * Initialize statistics state.
+ *
+ * @param stat Statistic state.
+ */
+PJ_INLINE(void) pj_math_stat_init(pj_math_stat *stat)
+{
+ pj_bzero(stat, sizeof(pj_math_stat));
+}
+
+/**
+ * Update statistics state as a new sample comes.
+ *
+ * @param stat Statistic state.
+ * @param val The new sample data.
+ */
+PJ_INLINE(void) pj_math_stat_update(pj_math_stat *stat, int val)
+{
+#if PJ_HAS_FLOATING_POINT
+ float delta;
+#else
+ int delta;
+#endif
+
+ stat->last = val;
+
+ if (stat->n++) {
+ if (stat->min > val)
+ stat->min = val;
+ if (stat->max < val)
+ stat->max = val;
+ } else {
+ stat->min = stat->max = val;
+ }
+
+#if PJ_HAS_FLOATING_POINT
+ delta = val - stat->fmean_;
+ stat->fmean_ += delta/stat->n;
+
+ /* Return mean value with 'rounding' */
+ stat->mean = (int) (stat->fmean_ + 0.5);
+
+ stat->m2_ += (int)(delta * (val-stat->fmean_));
+#else
+ delta = val - stat->mean;
+ stat->mean += delta/stat->n;
+ stat->mean_res_ += delta % stat->n;
+ if (stat->mean_res_ >= stat->n) {
+ ++stat->mean;
+ stat->mean_res_ -= stat->n;
+ } else if (stat->mean_res_ <= -stat->n) {
+ --stat->mean;
+ stat->mean_res_ += stat->n;
+ }
+
+ stat->m2_ += delta * (val-stat->mean);
+#endif
+}
+
+/**
+ * Get the standard deviation of specified statistics state.
+ *
+ * @param stat Statistic state.
+ *
+ * @return The standard deviation.
+ */
+PJ_INLINE(unsigned) pj_math_stat_get_stddev(const pj_math_stat *stat)
+{
+ if (stat->n == 0) return 0;
+ return (pj_isqrt((unsigned)(stat->m2_/stat->n)));
+}
+
+/**
+ * Set the standard deviation of statistics state. This is useful when
+ * the statistic state is operated in 'read-only' mode as a storage of
+ * statistical data.
+ *
+ * @param stat Statistic state.
+ *
+ * @param dev The standard deviation.
+ */
+PJ_INLINE(void) pj_math_stat_set_stddev(pj_math_stat *stat, unsigned dev)
+{
+ if (stat->n == 0)
+ stat->n = 1;
+ stat->m2_ = dev*dev*stat->n;
+}
+
+/** @} */
+
+PJ_END_DECL
+
+#endif /* __PJ_MATH_H__ */