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 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
