40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/*
|
|
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
|
|
/*
|
|
* This file contains the function WebRtcSpl_Energy().
|
|
* The description header can be found in signal_processing_library.h
|
|
*
|
|
*/
|
|
|
|
#include "common_audio/signal_processing/include/signal_processing_library.h"
|
|
|
|
int32_t WebRtcSpl_Energy(int16_t* vector,
|
|
size_t vector_length,
|
|
int* scale_factor)
|
|
{
|
|
int32_t en = 0;
|
|
size_t i;
|
|
int scaling =
|
|
WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
|
|
size_t looptimes = vector_length;
|
|
int16_t *vectorptr = vector;
|
|
|
|
for (i = 0; i < looptimes; i++)
|
|
{
|
|
en += (*vectorptr * *vectorptr) >> scaling;
|
|
vectorptr++;
|
|
}
|
|
*scale_factor = scaling;
|
|
|
|
return en;
|
|
}
|