1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /* 19 20 Filename: get_sbr_stopfreq.c 21 22 ------------------------------------------------------------------------------ 23 REVISION HISTORY 24 25 26 Who: Date: MM/DD/YYYY 27 Description: 28 29 ------------------------------------------------------------------------------ 30 INPUT AND OUTPUT DEFINITIONS 31 32 33 34 ------------------------------------------------------------------------------ 35 FUNCTION DESCRIPTION 36 37 38 ------------------------------------------------------------------------------ 39 REQUIREMENTS 40 41 42 ------------------------------------------------------------------------------ 43 REFERENCES 44 45 SC 29 Software Copyright Licencing Disclaimer: 46 47 This software module was originally developed by 48 Coding Technologies 49 50 and edited by 51 - 52 53 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 54 standards for reference purposes and its performance may not have been 55 optimized. This software module is an implementation of one or more tools as 56 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. 57 ISO/IEC gives users free license to this software module or modifications 58 thereof for use in products claiming conformance to audiovisual and 59 image-coding related ITU Recommendations and/or ISO/IEC International 60 Standards. ISO/IEC gives users the same free license to this software module or 61 modifications thereof for research purposes and further ISO/IEC standardisation. 62 Those intending to use this software module in products are advised that its 63 use may infringe existing patents. ISO/IEC have no liability for use of this 64 software module or modifications thereof. Copyright is not released for 65 products that do not conform to audiovisual and image-coding related ITU 66 Recommendations and/or ISO/IEC International Standards. 67 The original developer retains full right to modify and use the code for its 68 own purpose, assign or donate the code to a third party and to inhibit third 69 parties from using the code for products that do not conform to audiovisual and 70 image-coding related ITU Recommendations and/or ISO/IEC International Standards. 71 This copyright notice must be included in all copies or derivative works. 72 Copyright (c) ISO/IEC 2002. 73 74 ------------------------------------------------------------------------------ 75 PSEUDO-CODE 76 77 if(fs < 32000) 78 { 79 k1_min = (Int) ( ( (float) (6000 * 2 * 64) / fs ) + 0.5 ); 80 } 81 else 82 { 83 if (fs < 64000) 84 { 85 k1_min = (Int) ( ( (float) (8000 * 2 * 64) / fs ) + 0.5 ); 86 } 87 else 88 { 89 k1_min = (Int) ( ((float) (10000 * 2 * 64) / fs ) + 0.5); 90 } 91 } 92 93 return((Int)( k1_min * pow( 64.0 / k1_min,(stop_freq)/13.0) + 0.5)); 94 95 ------------------------------------------------------------------------------ 96 */ 97 98 99 /*---------------------------------------------------------------------------- 100 ; INCLUDES 101 ----------------------------------------------------------------------------*/ 102 103 #ifdef AAC_PLUS 104 105 #include "get_sbr_stopfreq.h" 106 /*---------------------------------------------------------------------------- 107 ; MACROS 108 ; Define module specific macros here 109 ----------------------------------------------------------------------------*/ 110 111 112 /*---------------------------------------------------------------------------- 113 ; DEFINES 114 ; Include all pre-processor statements here. Include conditional 115 ; compile variables also. 116 ----------------------------------------------------------------------------*/ 117 118 /*---------------------------------------------------------------------------- 119 ; LOCAL FUNCTION DEFINITIONS 120 ; Function Prototype declaration 121 ----------------------------------------------------------------------------*/ 122 123 /*---------------------------------------------------------------------------- 124 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 125 ; Variable declaration - defined here and used outside this module 126 ----------------------------------------------------------------------------*/ 127 128 /*---------------------------------------------------------------------------- 129 ; EXTERNAL FUNCTION REFERENCES 130 ; Declare functions defined elsewhere and referenced in this module 131 ----------------------------------------------------------------------------*/ 132 133 /*---------------------------------------------------------------------------- 134 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 135 ; Declare variables used in this module but defined elsewhere 136 ----------------------------------------------------------------------------*/ 137 138 /*---------------------------------------------------------------------------- 139 ; FUNCTION CODE 140 ----------------------------------------------------------------------------*/ 141 142 const UChar sbr_stopfreq_tbl[6][13] = 143 { 144 145 { 21, 23, 25, 27, 29, 32, 35, 38, 41, 45, 49, 54, 59}, /* 48000 */ 146 { 23, 25, 27, 29, 31, 34, 37, 40, 43, 47, 51, 55, 59}, /* 44100 */ 147 { 32, 34, 36, 38, 40, 42, 44, 46, 49, 52, 55, 58, 61}, /* 32000 and 24000 */ 148 { 35, 36, 38, 40, 42, 44, 46, 48, 50, 52, 55, 58, 61}, /* 22050 */ 149 { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 62} /* 16000 */ 150 151 }; 152 153 Int get_sbr_stopfreq(const Int32 fs, 154 const Int32 stop_freq) 155 { 156 157 Int i; 158 159 switch (fs) 160 { 161 case 48000: 162 i = 0; 163 break; 164 165 case 32000: 166 case 24000: 167 i = 2; 168 break; 169 170 case 22050: 171 i = 3; 172 break; 173 174 case 16000: 175 i = 4; 176 break; 177 178 case 44100: 179 default: 180 i = 1; 181 break; 182 } 183 184 return((Int)sbr_stopfreq_tbl[i][stop_freq]); 185 186 } 187 188 189 190 #endif 191
