File: energy.c

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/*
 *  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;
}