1 /****************************************************************************** 2 * 3 * Copyright (C) 2018 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ***************************************************************************** 18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 /*! 21 ****************************************************************************** 22 * \file common_rom.h 23 * 24 * \brief 25 * This file contain square root table declarations 26 * 27 * \date 28 * 29 * \author 30 * ittiam 31 * 32 ****************************************************************************** 33 */ 34 #ifndef SQRT_TAB_H 35 #define SQRT_TAB_H 36 37 /*****************************************************************************/ 38 /* Constant Macros */ 39 /*****************************************************************************/ 40 41 #define INV_SQRT_2_Q31 1518500250 /* 1/sqrt(2) in Q31 */ 42 #define INV_SQRT_2_Q15 23170 43 44 #define Q_SQRT_TAB 15 45 46 extern const WORD32 gi4_sqrt_tab[513]; /*sqrt_tab in Q15*/ 47 48 #endif 49
