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 20 WebRtc_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
