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/*
** Copyright 2003-2010, VisualOn, Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
/***************************************************************************
* File: qisf_ns.c *
* *
* Description: Coding/Decoding of ISF parameters for background noise.*
* The ISF vector is quantized using VQ with split-by-5 *
* *
****************************************************************************/
#include "typedef.h"
#include "basic_op.h"
#include "acelp.h"
#include "qisf_ns.tab" /* Codebooks of ISFs */
/*------------------------------------------------------------------*
* routine: Qisf_ns() *
* ~~~~~~~~~ *
*------------------------------------------------------------------*/
void Qisf_ns(
Word16 * isf1, /* input : ISF in the frequency domain (0..0.5) */
Word16 * isf_q, /* output: quantized ISF */
Word16 * indice /* output: quantization indices */
)
{
Word16 i;
Word32 tmp;
for (i = 0; i < ORDER; i++)
{
isf_q[i] = sub(isf1[i], mean_isf_noise[i]);
}
indice[0] = Sub_VQ(&isf_q[0], dico1_isf_noise, 2, SIZE_BK_NOISE1, &tmp);
indice[1] = Sub_VQ(&isf_q[2], dico2_isf_noise, 3, SIZE_BK_NOISE2, &tmp);
indice[2] = Sub_VQ(&isf_q[5], dico3_isf_noise, 3, SIZE_BK_NOISE3, &tmp);
indice[3] = Sub_VQ(&isf_q[8], dico4_isf_noise, 4, SIZE_BK_NOISE4, &tmp);
indice[4] = Sub_VQ(&isf_q[12], dico5_isf_noise, 4, SIZE_BK_NOISE5, &tmp);
/* decoding the ISFs */
Disf_ns(indice, isf_q);
return;
}
/********************************************************************
* Function: Disf_ns() *
* ~~~~~~~~~ *
* Decoding of ISF parameters *
*-------------------------------------------------------------------*
* Arguments: *
* indice[] : indices of the selected codebook entries *
* isf[] : quantized ISFs (in frequency domain) *
*********************************************************************/
void Disf_ns(
Word16 * indice, /* input: quantization indices */
Word16 * isf_q /* input : ISF in the frequency domain (0..0.5) */
)
{
Word16 i;
for (i = 0; i < 2; i++)
{
isf_q[i] = dico1_isf_noise[indice[0] * 2 + i];
}
for (i = 0; i < 3; i++)
{
isf_q[i + 2] = dico2_isf_noise[indice[1] * 3 + i];
}
for (i = 0; i < 3; i++)
{
isf_q[i + 5] = dico3_isf_noise[indice[2] * 3 + i];
}
for (i = 0; i < 4; i++)
{
isf_q[i + 8] = dico4_isf_noise[indice[3] * 4 + i];
}
for (i = 0; i < 4; i++)
{
isf_q[i + 12] = dico5_isf_noise[indice[4] * 4 + i];
}
for (i = 0; i < ORDER; i++)
{
isf_q[i] = add(isf_q[i], mean_isf_noise[i]);
}
Reorder_isf(isf_q, ISF_GAP, ORDER);
return;
}
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