Initial commit

added libraries:
opus
flac
libsndfile

updated:
libvorbis
libogg
openal

- Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.

Engine/lib/libvorbis/test/util.c

@@ -0,0 +1,52 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
+ * by the Xiph.Org Foundation https://xiph.org/                     *
+ *                                                                  *
+ ********************************************************************
+
+ function: utility functions for vorbis codec test suite.
+
+ ********************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <errno.h>
+
+#include <vorbis/codec.h>
+#include <vorbis/vorbisenc.h>
+
+#include "util.h"
+
+void
+gen_windowed_sine (float *data, int len, float maximum)
+{    int k ;
+
+    memset (data, 0, len * sizeof (float)) ;
+
+    len /= 2 ;
+
+    for (k = 0 ; k < len ; k++)
+    {    data [k] = sin (2.0 * k * M_PI * 1.0 / 32.0 + 0.4) ;
+
+        /* Apply Hanning Window. */
+        data [k] *= maximum * (0.5 - 0.5 * cos (2.0 * M_PI * k / ((len) - 1))) ;
+        }
+
+    return ;
+}
+
+void
+set_data_in (float * data, unsigned len, float value)
+{        unsigned k ;
+
+        for (k = 0 ; k < len ; k++)
+                data [k] = value ;
+}