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47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_EnergyInverse.c
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******************************************************************/
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/* Inverses the in vector in into Q29 domain */
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#include "energy_inverse.h"
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void WebRtcIlbcfix_EnergyInverse(
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int16_t *energy, /* (i/o) Energy and inverse
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energy (in Q29) */
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int noOfEnergies) /* (i) The length of the energy
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vector */
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{
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int32_t Nom=(int32_t)0x1FFFFFFF;
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int16_t *energyPtr;
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int i;
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/* Set the minimum energy value to 16384 to avoid overflow */
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energyPtr=energy;
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for (i=0; i<noOfEnergies; i++) {
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(*energyPtr)=WEBRTC_SPL_MAX((*energyPtr),16384);
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energyPtr++;
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}
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/* Calculate inverse energy in Q29 */
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energyPtr=energy;
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for (i=0; i<noOfEnergies; i++) {
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(*energyPtr) = (int16_t)WebRtcSpl_DivW32W16(Nom, (*energyPtr));
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energyPtr++;
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}
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}
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