energy.c (1098B)
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 * This file contains the function WebRtcSpl_Energy(). 13 * The description header can be found in signal_processing_library.h 14 * 15 */ 16 17 #include "common_audio/signal_processing/include/signal_processing_library.h" 18 19 int32_t WebRtcSpl_Energy(int16_t* vector, 20 size_t vector_length, 21 int* scale_factor) { 22 int32_t en = 0; 23 size_t i; 24 int scaling = 25 WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length); 26 size_t looptimes = vector_length; 27 int16_t* vectorptr = vector; 28 29 for (i = 0; i < looptimes; i++) { 30 en += (*vectorptr * *vectorptr) >> scaling; 31 vectorptr++; 32 } 33 *scale_factor = scaling; 34 35 return en; 36 }