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/******************************************************************************
*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
/*!
******************************************************************************
* \file squrt_interp.c
*
* \brief
* This file contain square root interpolate function
*
* \date
*
* \author
* ittiam
*
******************************************************************************
*/
/*****************************************************************************/
/* File Includes */
/*****************************************************************************/
/* System include files */
#include <stdio.h>
#include <stdlib.h>
/* User include files */
#include "ia_type_def.h"
#include "defs.h"
/* #include "constants.h" */
#include "ia_basic_ops32.h"
/* #include "ia_basic_ops16.h" */
#include "ia_basic_ops40.h"
#include "sqrt_interp.h"
/* #include "ia_enhaacplus_enc_basicops.h" */
#include "common_rom.h"
WORD32 sqrtFix_interpolate(WORD32 num, WORD *q, const WORD32 *sqrt_tab)
{
WORD32 index, answer, temp, delta, step_size;
WORD q_temp = *q;
WORD k;
if(num == 0)
return 0;
k = norm32(num);
temp = shr32(shl32(num, k), 21);
q_temp += k;
index = temp & 0x1FF; /* Leave leading 1 */
{
delta = shl32((shl32(num, k) - shl32(temp, 21)), 10);
step_size = sub32(sqrt_tab[index + 1], sqrt_tab[index]);
step_size = mult32_shl_sat(step_size, delta); /* Q:Q_SQRT_TAB + 21 + 10 - 31 */
answer = add32(sqrt_tab[index], step_size);
}
if(q_temp & 1)
{
q_temp -= 1;
answer = mult32_shl_sat(answer, INV_SQRT_2_Q31);
}
q_temp = q_temp >> 1;
q_temp += (Q_SQRT_TAB);
*q = q_temp;
answer >>= 1;
*q -= 1;
return answer;
}
WORD32 sqrtFix(WORD32 num, WORD *q, const WORD32 *sqrt_tab)
{
WORD32 index, answer, temp;
WORD k;
WORD q_temp = *q;
if(num == 0)
return 0;
k = norm32(num);
temp = shr32(shl32(num, k), 21);
q_temp += k;
index = temp & 0x1FF; /* Leave leading 1 */
answer = sqrt_tab[index];
if(q_temp & 1)
{
q_temp -= 1;
answer = mult32x16in32_shl(answer, INV_SQRT_2_Q15);
}
q_temp = q_temp >> 1;
q_temp += Q_SQRT_TAB;
*q = q_temp;
return answer;
}
#ifdef ITT_C6678
#pragma CODE_SECTION(sqrtFix_interpolate, "itt_varq_l1pram");
#pragma CODE_SECTION(sqrtFix, "itt_varq_l1pram");
#endif
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