/******************************************************************************
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* *
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#include "ixheaacd_sbr_common.h"
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#include <ixheaacd_type_def.h>
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#include "ixheaacd_constants.h"
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#include <ixheaacd_basic_ops32.h>
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#include <ixheaacd_basic_ops16.h>
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#include <ixheaacd_basic_ops40.h>
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#include "ixheaacd_basic_ops.h"
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#include "ixheaacd_common_rom.h"
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#include "ixheaacd_dsp_fft32x32s.h"
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#include "ixheaacd_intrinsics.h"
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#include <ixheaacd_basic_op.h>
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VOID ixheaacd_inv_dit_fft_8pt_dec(WORD32 *y, WORD32 *real, WORD32 *imag) {
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WORD32 a0, a1, a2, a3, a00, a10, a20, a30;
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WORD32 vr, vi;
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WORD32 x[16];
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a00 = ixheaacd_add32_sat(y[0], y[8]);
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a0 = ixheaacd_sub32_sat(y[0], y[8]);
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a20 = ixheaacd_add32_sat(y[1], y[9]);
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a3 = ixheaacd_sub32_sat(y[1], y[9]);
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a10 = ixheaacd_add32_sat(y[4], y[12]);
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a2 = ixheaacd_sub32_sat(y[4], y[12]);
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a30 = ixheaacd_add32_sat(y[5], y[13]);
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a1 = ixheaacd_sub32_sat(y[5], y[13]);
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x[0] = ixheaacd_add32_sat(a00, a10);
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x[4] = ixheaacd_sub32_sat(a00, a10);
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x[1] = ixheaacd_add32_sat(a20, a30);
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x[5] = ixheaacd_sub32_sat(a20, a30);
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x[2] = ixheaacd_sub32_sat(a0, a1);
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x[6] = ixheaacd_add32_sat(a0, a1);
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x[3] = ixheaacd_add32_sat(a3, a2);
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x[7] = ixheaacd_sub32_sat(a3, a2);
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a00 = ixheaacd_add32_sat(y[2], y[10]);
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a0 = ixheaacd_sub32_sat(y[2], y[10]);
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a20 = ixheaacd_add32_sat(y[3], y[11]);
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a3 = ixheaacd_sub32_sat(y[3], y[11]);
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a10 = ixheaacd_add32_sat(y[6], y[14]);
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a2 = ixheaacd_sub32_sat(y[6], y[14]);
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a30 = ixheaacd_add32_sat(y[7], y[15]);
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a1 = ixheaacd_sub32_sat(y[7], y[15]);
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x[8] = ixheaacd_add32_sat(a00, a10);
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x[12] = ixheaacd_sub32_sat(a00, a10);
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x[9] = ixheaacd_add32_sat(a20, a30);
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x[13] = ixheaacd_sub32_sat(a20, a30);
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x[10] = ixheaacd_sub32_sat(a0, a1);
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x[14] = ixheaacd_add32_sat(a0, a1);
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x[11] = ixheaacd_add32_sat(a3, a2);
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x[15] = ixheaacd_sub32_sat(a3, a2);
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real[0] = ixheaacd_add32_sat(x[0], x[8]);
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imag[0] = ixheaacd_add32_sat(x[1], x[9]);
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a00 = ixheaacd_sub32_sat(x[0], x[8]);
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a10 = ixheaacd_sub32_sat(x[1], x[9]);
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a0 = ixheaacd_sub32_sat(x[4], x[13]);
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a1 = ixheaacd_add32_sat(x[5], x[12]);
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real[4] = ixheaacd_add32_sat(x[4], x[13]);
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imag[4] = ixheaacd_sub32_sat(x[5], x[12]);
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vr = ixheaacd_mult32x16in32_shl_sat(ixheaacd_sub32_sat(x[10], x[11]), 0x5A82);
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vi = ixheaacd_mult32x16in32_shl_sat(ixheaacd_add32_sat(x[10], x[11]), 0x5A82);
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real[1] = ixheaacd_add32_sat(x[2], vr);
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imag[1] = ixheaacd_add32_sat(x[3], vi);
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a2 = ixheaacd_sub32_sat(x[2], vr);
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a3 = ixheaacd_sub32_sat(x[3], vi);
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real[2] = ixheaacd_add32_sat(a0, a2);
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imag[2] = ixheaacd_add32_sat(a1, a3);
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vr = ixheaacd_mult32x16in32_shl_sat(ixheaacd_add32_sat(x[14], x[15]), 0x5A82);
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vi = ixheaacd_mult32x16in32_shl_sat(ixheaacd_sub32_sat(x[14], x[15]), 0x5A82);
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a20 = ixheaacd_sub32_sat(x[6], vr);
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a30 = ixheaacd_add32_sat(x[7], vi);
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real[3] = ixheaacd_add32_sat(a00, a20);
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imag[3] = ixheaacd_add32_sat(a10, a30);
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real[5] = ixheaacd_add32_sat(x[6], vr);
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imag[5] = ixheaacd_sub32_sat(x[7], vi);
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}
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