1/*
2 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12/*
13 * This file contains the function WebRtcSpl_Energy().
14 * The description header can be found in signal_processing_library.h
15 *
16 */
17
18#include "signal_processing_library.h"
19
20WebRtc_Word32 WebRtcSpl_Energy(WebRtc_Word16* vector, int vector_length, int* scale_factor)
21{
22    WebRtc_Word32 en = 0;
23    int i;
24    int scaling = WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
25    int looptimes = vector_length;
26    WebRtc_Word16 *vectorptr = vector;
27
28    for (i = 0; i < looptimes; i++)
29    {
30        en += WEBRTC_SPL_MUL_16_16_RSFT(*vectorptr, *vectorptr, scaling);
31        vectorptr++;
32    }
33    *scale_factor = scaling;
34
35    return en;
36}
37