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 "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
19
20int32_t WebRtcSpl_Energy(int16_t* vector,
21                         size_t vector_length,
22                         int* scale_factor)
23{
24    int32_t en = 0;
25    size_t i;
26    int scaling =
27        WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
28    size_t looptimes = vector_length;
29    int16_t *vectorptr = vector;
30
31    for (i = 0; i < looptimes; i++)
32    {
33      en += (*vectorptr * *vectorptr) >> scaling;
34      vectorptr++;
35    }
36    *scale_factor = scaling;
37
38    return en;
39}
40