mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-23 16:37:30 +00:00
45 lines
1.2 KiB
C
45 lines
1.2 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_GetScalingSquare().
|
||
|
|
* The description header can be found in signal_processing_library.h
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
|
||
|
|
|
||
|
|
int WebRtcSpl_GetScalingSquare(int16_t *in_vector, int in_vector_length, int times)
|
||
|
|
{
|
||
|
|
int nbits = WebRtcSpl_GetSizeInBits(times);
|
||
|
|
int i;
|
||
|
|
int16_t smax = -1;
|
||
|
|
int16_t sabs;
|
||
|
|
int16_t *sptr = in_vector;
|
||
|
|
int t;
|
||
|
|
int looptimes = in_vector_length;
|
||
|
|
|
||
|
|
for (i = looptimes; i > 0; i--)
|
||
|
|
{
|
||
|
|
sabs = (*sptr > 0 ? *sptr++ : -*sptr++);
|
||
|
|
smax = (sabs > smax ? sabs : smax);
|
||
|
|
}
|
||
|
|
t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax));
|
||
|
|
|
||
|
|
if (smax == 0)
|
||
|
|
{
|
||
|
|
return 0; // Since norm(0) returns 0
|
||
|
|
} else
|
||
|
|
{
|
||
|
|
return (t > nbits) ? 0 : nbits - t;
|
||
|
|
}
|
||
|
|
}
|