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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_CbMemEnergyAugmentation.c
******************************************************************/
#include "modules/audio_coding/codecs/ilbc/cb_mem_energy_augmentation.h"
#include "modules/audio_coding/codecs/ilbc/constants.h"
#include "modules/audio_coding/codecs/ilbc/defines.h"
void WebRtcIlbcfix_CbMemEnergyAugmentation(
int16_t *interpSamples, /* (i) The interpolated samples */
int16_t *CBmem, /* (i) The CB memory */
int scale, /* (i) The scaling of all energy values */
size_t base_size, /* (i) Index to where energy values should be stored */
int16_t *energyW16, /* (o) Energy in the CB vectors */
int16_t *energyShifts /* (o) Shift value of the energy */
){
int32_t energy, tmp32;
int16_t *ppe, *pp, *interpSamplesPtr;
int16_t *CBmemPtr;
size_t lagcount;
int16_t *enPtr=&energyW16[base_size-20];
int16_t *enShPtr=&energyShifts[base_size-20];
int32_t nrjRecursive;
CBmemPtr = CBmem+147;
interpSamplesPtr = interpSamples;
/* Compute the energy for the first (low-5) noninterpolated samples */
nrjRecursive = WebRtcSpl_DotProductWithScale( CBmemPtr-19, CBmemPtr-19, 15, scale);
ppe = CBmemPtr - 20;
for (lagcount=20; lagcount<=39; lagcount++) {
/* Update the energy recursively to save complexity */
nrjRecursive += (*ppe * *ppe) >> scale;
ppe--;
energy = nrjRecursive;
/* interpolation */
energy += WebRtcSpl_DotProductWithScale(interpSamplesPtr, interpSamplesPtr, 4, scale);
interpSamplesPtr += 4;
/* Compute energy for the remaining samples */
pp = CBmemPtr - lagcount;
energy += WebRtcSpl_DotProductWithScale(pp, pp, SUBL-lagcount, scale);
/* Normalize the energy and store the number of shifts */
(*enShPtr) = (int16_t)WebRtcSpl_NormW32(energy);
tmp32 = energy << *enShPtr;
*enPtr = (int16_t)(tmp32 >> 16);
enShPtr++;
enPtr++;
}
}
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