1 files changed, 36 insertions, 0 deletions
diff --git a/src/common_audio/signal_processing/energy.c b/src/common_audio/signal_processing/energy.c
new file mode 100644
index 0000000000..e8fdf94e03
--- /dev/null
+++ b/src/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 "signal_processing_library.h"
+
+WebRtc_Word32 WebRtcSpl_Energy(WebRtc_Word16* vector, int vector_length, int* scale_factor)
+{
+    WebRtc_Word32 en = 0;
+    int i;
+    int scaling = WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
+    int looptimes = vector_length;
+    WebRtc_Word16 *vectorptr = vector;
+
+    for (i = 0; i < looptimes; i++)
+    {
+        en += WEBRTC_SPL_MUL_16_16_RSFT(*vectorptr, *vectorptr, scaling);
+        vectorptr++;
+    }
+    *scale_factor = scaling;
+
+    return en;
+}