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 
WebRtcSpl_Energy(int16_t * vector,size_t vector_length,int * scale_factor)20 int32_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