--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/tests/test_utils.c	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,135 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * test_utils.c - Utility routines for module tests.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2006 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: test_utils.c,v 1.7 2006/11/19 14:07:27 steveu Exp $
+ */
+
+/*! \file */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdio.h>
+#if defined(HAVE_TGMATH_H)
+#include <tgmath.h>
+#endif
+#if defined(HAVE_MATH_H)
+#include <math.h>
+#endif
+#include <time.h>
+#include <fcntl.h>
+#include <audiofile.h>
+#include <tiffio.h>
+
+#include "spandsp.h"
+#include "test_utils.h"
+
+struct codec_munge_state_s
+{
+    int munging_codec;
+    g726_state_t g726_enc_state;
+    g726_state_t g726_dec_state;
+};
+
+codec_munge_state_t *codec_munge_init(int codec)
+{
+    codec_munge_state_t *s;
+    
+    if ((s = (codec_munge_state_t *) malloc(sizeof(*s))))
+    {
+        switch (codec)
+        {
+        case MUNGE_CODEC_G726_40K:
+            g726_init(&s->g726_enc_state, 40000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            g726_init(&s->g726_dec_state, 40000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            s->munging_codec = MUNGE_CODEC_G726_32K;
+            break;
+        case MUNGE_CODEC_G726_32K:
+            g726_init(&s->g726_enc_state, 32000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            g726_init(&s->g726_dec_state, 32000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            s->munging_codec = MUNGE_CODEC_G726_32K;
+            break;
+        case MUNGE_CODEC_G726_24K:
+            g726_init(&s->g726_enc_state, 24000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            g726_init(&s->g726_dec_state, 24000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            s->munging_codec = MUNGE_CODEC_G726_32K;
+            break;
+        case MUNGE_CODEC_G726_16K:
+            g726_init(&s->g726_enc_state, 16000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            g726_init(&s->g726_dec_state, 16000, G726_ENCODING_LINEAR, G726_PACKING_NONE);
+            s->munging_codec = MUNGE_CODEC_G726_32K;
+            break;
+        default:
+            s->munging_codec = codec;
+            break;
+        }
+    }
+    return s;
+}
+/*- End of function --------------------------------------------------------*/
+
+void codec_munge(codec_munge_state_t *s, int16_t amp[], int len)
+{
+    uint8_t law;
+    uint8_t adpcmdata[160];
+    int i;
+    int adpcm;
+    int x;
+
+    switch (s->munging_codec)
+    {
+    case MUNGE_CODEC_NONE:
+        /* Do nothing */
+        break;
+    case MUNGE_CODEC_ALAW:
+        for (i = 0;  i < len;  i++)
+        {
+            law = linear_to_alaw(amp[i]);
+            amp[i] = alaw_to_linear(law);
+        }
+        break;
+    case MUNGE_CODEC_ULAW:
+        for (i = 0;  i < len;  i++)
+        {
+            law = linear_to_ulaw(amp[i]);
+            amp[i] = ulaw_to_linear(law);
+        }
+        break;
+    case MUNGE_CODEC_G726_32K:
+        /* This could actually be any of the G.726 rates */
+        for (i = 0;  i < len;  i += x)
+        {
+            x = (len - i >= 160)  ?  160  :  (len - i);
+            adpcm = g726_encode(&s->g726_enc_state, adpcmdata, amp + i, x);
+            g726_decode(&s->g726_dec_state, amp + i, adpcmdata, adpcm);
+        }
+        break;
+    }
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/