av/media/libstagefright/codecs/amrwbenc/src/qisf_ns.c

/*
 ** 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;
}