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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.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_EnergyInverse.c
******************************************************************/
/* Inverses the in vector in into Q29 domain */
#include "modules/audio_coding/codecs/ilbc/energy_inverse.h"
void WebRtcIlbcfix_EnergyInverse(
int16_t *energy, /* (i/o) Energy and inverse
energy (in Q29) */
size_t noOfEnergies) /* (i) The length of the energy
vector */
{
int32_t Nom=(int32_t)0x1FFFFFFF;
int16_t *energyPtr;
size_t i;
/* Set the minimum energy value to 16384 to avoid overflow */
energyPtr=energy;
for (i=0; i<noOfEnergies; i++) {
(*energyPtr)=WEBRTC_SPL_MAX((*energyPtr),16384);
energyPtr++;
}
/* Calculate inverse energy in Q29 */
energyPtr=energy;
for (i=0; i<noOfEnergies; i++) {
(*energyPtr) = (int16_t)WebRtcSpl_DivW32W16(Nom, (*energyPtr));
energyPtr++;
}
}
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