Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/common_audio/signal_processing/energy.c

@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_Energy().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+int32_t WebRtcSpl_Energy(int16_t* vector, int vector_length, int* scale_factor)
+{
+    int32_t en = 0;
+    int i;
+    int scaling = WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
+    int looptimes = vector_length;
+    int16_t *vectorptr = vector;
+
+    for (i = 0; i < looptimes; i++)
+    {
+        en += WEBRTC_SPL_MUL_16_16_RSFT(*vectorptr, *vectorptr, scaling);
+        vectorptr++;
+    }
+    *scale_factor = scaling;
+
+    return en;
+}