Line data    Source code

       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           0 : int32_t WebRtcSpl_Energy(int16_t* vector,
      21             :                          size_t vector_length,
      22             :                          int* scale_factor)
      23             : {
      24           0 :     int32_t en = 0;
      25             :     size_t i;
      26           0 :     int scaling =
      27           0 :         WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
      28           0 :     size_t looptimes = vector_length;
      29           0 :     int16_t *vectorptr = vector;
      30             : 
      31           0 :     for (i = 0; i < looptimes; i++)
      32             :     {
      33           0 :       en += (*vectorptr * *vectorptr) >> scaling;
      34           0 :       vectorptr++;
      35             :     }
      36           0 :     *scale_factor = scaling;
      37             : 
      38           0 :     return en;
      39             : }