yading@10: /*
yading@10:  * Copyright (c) 2012
yading@10:  *      MIPS Technologies, Inc., California.
yading@10:  *
yading@10:  * Redistribution and use in source and binary forms, with or without
yading@10:  * modification, are permitted provided that the following conditions
yading@10:  * are met:
yading@10:  * 1. Redistributions of source code must retain the above copyright
yading@10:  *    notice, this list of conditions and the following disclaimer.
yading@10:  * 2. Redistributions in binary form must reproduce the above copyright
yading@10:  *    notice, this list of conditions and the following disclaimer in the
yading@10:  *    documentation and/or other materials provided with the distribution.
yading@10:  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
yading@10:  *    contributors may be used to endorse or promote products derived from
yading@10:  *    this software without specific prior written permission.
yading@10:  *
yading@10:  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
yading@10:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
yading@10:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
yading@10:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
yading@10:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
yading@10:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
yading@10:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
yading@10:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
yading@10:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
yading@10:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
yading@10:  * SUCH DAMAGE.
yading@10:  *
yading@10:  * Author:  Stanislav Ocovaj (socovaj@mips.com)
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * definitions and initialization of LUT table for MIPS FFT
yading@10:  */
yading@10: #include "fft_table.h"
yading@10: 
yading@10: uint16_t fft_offsets_lut[0x2aab];
yading@10: 
yading@10: void ff_fft_lut_init(uint16_t *table, int off, int size, int *index)
yading@10: {
yading@10:     if (size < 16) {
yading@10:         table[*index] = off >> 2;
yading@10:         (*index)++;
yading@10:     }
yading@10:     else {
yading@10:         ff_fft_lut_init(table, off, size>>1, index);
yading@10:         ff_fft_lut_init(table, off+(size>>1), size>>2, index);
yading@10:         ff_fft_lut_init(table, off+3*(size>>2), size>>2, index);
yading@10:     }
yading@10: }