1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Frderung der angewandten 5 Forschung e.V. All rights reserved. 6 7 1. INTRODUCTION 8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software 9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding 10 scheme for digital audio. This FDK AAC Codec software is intended to be used on 11 a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient 14 general perceptual audio codecs. AAC-ELD is considered the best-performing 15 full-bandwidth communications codec by independent studies and is widely 16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG 17 specifications. 18 19 Patent licenses for necessary patent claims for the FDK AAC Codec (including 20 those of Fraunhofer) may be obtained through Via Licensing 21 (www.vialicensing.com) or through the respective patent owners individually for 22 the purpose of encoding or decoding bit streams in products that are compliant 23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of 24 Android devices already license these patent claims through Via Licensing or 25 directly from the patent owners, and therefore FDK AAC Codec software may 26 already be covered under those patent licenses when it is used for those 27 licensed purposes only. 28 29 Commercially-licensed AAC software libraries, including floating-point versions 30 with enhanced sound quality, are also available from Fraunhofer. Users are 31 encouraged to check the Fraunhofer website for additional applications 32 information and documentation. 33 34 2. COPYRIGHT LICENSE 35 36 Redistribution and use in source and binary forms, with or without modification, 37 are permitted without payment of copyright license fees provided that you 38 satisfy the following conditions: 39 40 You must retain the complete text of this software license in redistributions of 41 the FDK AAC Codec or your modifications thereto in source code form. 42 43 You must retain the complete text of this software license in the documentation 44 and/or other materials provided with redistributions of the FDK AAC Codec or 45 your modifications thereto in binary form. You must make available free of 46 charge copies of the complete source code of the FDK AAC Codec and your 47 modifications thereto to recipients of copies in binary form. 48 49 The name of Fraunhofer may not be used to endorse or promote products derived 50 from this library without prior written permission. 51 52 You may not charge copyright license fees for anyone to use, copy or distribute 53 the FDK AAC Codec software or your modifications thereto. 54 55 Your modified versions of the FDK AAC Codec must carry prominent notices stating 56 that you changed the software and the date of any change. For modified versions 57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" 58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK 59 AAC Codec Library for Android." 60 61 3. NO PATENT LICENSE 62 63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without 64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. 65 Fraunhofer provides no warranty of patent non-infringement with respect to this 66 software. 67 68 You may use this FDK AAC Codec software or modifications thereto only for 69 purposes that are authorized by appropriate patent licenses. 70 71 4. DISCLAIMER 72 73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright 74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, 75 including but not limited to the implied warranties of merchantability and 76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, 78 or consequential damages, including but not limited to procurement of substitute 79 goods or services; loss of use, data, or profits, or business interruption, 80 however caused and on any theory of liability, whether in contract, strict 81 liability, or tort (including negligence), arising in any way out of the use of 82 this software, even if advised of the possibility of such damage. 83 84 5. CONTACT INFORMATION 85 86 Fraunhofer Institute for Integrated Circuits IIS 87 Attention: Audio and Multimedia Departments - FDK AAC LL 88 Am Wolfsmantel 33 89 91058 Erlangen, Germany 90 91 www.iis.fraunhofer.de/amm 92 amm-info (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /******************* Library for basic calculation routines ******************** 96 97 Author(s): 98 99 Description: Scaling operations 100 101 *******************************************************************************/ 102 103 #ifndef SCALE_H 104 #define SCALE_H 105 106 #include "common_fix.h" 107 #include "genericStds.h" 108 #include "fixminmax.h" 109 110 #define SCALE_INLINE 111 112 #if defined(__arm__) 113 #include "arm/scale_arm.h" 114 115 #elif defined(__mips__) 116 #include "mips/scale_mips.h" 117 118 #endif 119 120 void scaleValues(FIXP_SGL *vector, INT len, INT scalefactor); 121 void scaleValues(FIXP_DBL *vector, INT len, INT scalefactor); 122 void scaleValues(FIXP_DBL *dst, const FIXP_DBL *src, INT len, INT scalefactor); 123 #if (SAMPLE_BITS == 16) 124 void scaleValues(FIXP_PCM *dst, const FIXP_DBL *src, INT len, INT scalefactor); 125 #endif 126 void scaleValues(FIXP_SGL *dst, const FIXP_SGL *src, INT len, INT scalefactor); 127 void scaleCplxValues(FIXP_DBL *r_dst, FIXP_DBL *i_dst, const FIXP_DBL *r_src, 128 const FIXP_DBL *i_src, INT len, INT scalefactor); 129 void scaleValuesWithFactor(FIXP_DBL *vector, FIXP_DBL factor, INT len, 130 INT scalefactor); 131 void scaleValuesSaturate(FIXP_DBL *vector, INT len, INT scalefactor); 132 void scaleValuesSaturate(FIXP_DBL *dst, FIXP_DBL *src, INT len, 133 INT scalefactor); 134 void scaleValuesSaturate(FIXP_SGL *dst, FIXP_DBL *src, INT len, 135 INT scalefactor); 136 void scaleValuesSaturate(INT_PCM *dst, FIXP_DBL *src, INT len, INT scalefactor); 137 void scaleValuesSaturate(FIXP_SGL *vector, INT len, INT scalefactor); 138 void scaleValuesSaturate(FIXP_SGL *dst, FIXP_SGL *src, INT len, 139 INT scalefactor); 140 void scaleValuesSaturate(INT_PCM *dst, INT_PCM *src, INT len, INT scalefactor); 141 INT getScalefactorShort(const SHORT *vector, INT len); 142 INT getScalefactorPCM(const INT_PCM *vector, INT len, INT stride); 143 INT getScalefactor(const FIXP_DBL *vector, INT len); 144 INT getScalefactor(const FIXP_SGL *vector, INT len); 145 146 #ifndef FUNCTION_scaleValue 147 /*! 148 * 149 * \brief Multiply input by \f$ 2^{scalefactor} \f$ 150 * 151 * \return Scaled input 152 * 153 */ 154 #define FUNCTION_scaleValue 155 inline FIXP_DBL scaleValue(const FIXP_DBL value, /*!< Value */ 156 INT scalefactor /*!< Scalefactor */ 157 ) { 158 if (scalefactor > 0) 159 return (value << scalefactor); 160 else 161 return (value >> (-scalefactor)); 162 } 163 inline FIXP_SGL scaleValue(const FIXP_SGL value, /*!< Value */ 164 INT scalefactor /*!< Scalefactor */ 165 ) { 166 if (scalefactor > 0) 167 return (value << scalefactor); 168 else 169 return (value >> (-scalefactor)); 170 } 171 #endif 172 173 #ifndef FUNCTION_scaleValueSaturate 174 /*! 175 * 176 * \brief Multiply input by \f$ 2^{scalefactor} \f$ 177 * \param value The value to be scaled. 178 * \param the shift amount 179 * \return \f$ value * 2^scalefactor \f$ 180 * 181 */ 182 #define FUNCTION_scaleValueSaturate 183 inline FIXP_DBL scaleValueSaturate(const FIXP_DBL value, 184 INT scalefactor /* in range -31 ... +31 */ 185 ) { 186 int headroom = fixnormz_D( 187 (INT)value ^ (INT)((value >> 31))); /* headroom in range 1...32 */ 188 if (scalefactor >= 0) { 189 /* shift left: saturate in case of headroom less/equal scalefactor */ 190 if (headroom <= scalefactor) { 191 if (value > (FIXP_DBL)0) 192 return (FIXP_DBL)MAXVAL_DBL; /* 0x7FFF.FFFF */ 193 else 194 return (FIXP_DBL)MINVAL_DBL + (FIXP_DBL)1; /* 0x8000.0001 */ 195 } else { 196 return fMax((value << scalefactor), (FIXP_DBL)MINVAL_DBL + (FIXP_DBL)1); 197 } 198 } else { 199 scalefactor = -scalefactor; 200 /* shift right: clear in case of 32-headroom greater/equal -scalefactor */ 201 if ((DFRACT_BITS - headroom) <= scalefactor) { 202 return (FIXP_DBL)0; 203 } else { 204 return fMax((value >> scalefactor), (FIXP_DBL)MINVAL_DBL + (FIXP_DBL)1); 205 } 206 } 207 } 208 #endif 209 210 #ifndef FUNCTION_scaleValueInPlace 211 /*! 212 * 213 * \brief Multiply input by \f$ 2^{scalefactor} \f$ in place 214 * 215 * \return void 216 * 217 */ 218 #define FUNCTION_scaleValueInPlace 219 inline void scaleValueInPlace(FIXP_DBL *value, /*!< Value */ 220 INT scalefactor /*!< Scalefactor */ 221 ) { 222 INT newscale; 223 /* Note: The assignment inside the if conditional allows combining a load with 224 * the compare to zero (on ARM and maybe others) */ 225 if ((newscale = (scalefactor)) >= 0) { 226 *(value) <<= newscale; 227 } else { 228 *(value) >>= -newscale; 229 } 230 } 231 #endif 232 233 /*! 234 * 235 * \brief Scale input value by 2^{scale} and saturate output to 2^{dBits-1} 236 * \return scaled and saturated value 237 * 238 * This macro scales src value right or left and applies saturation to 239 * (2^dBits)-1 maxima output. 240 */ 241 242 #ifndef SATURATE_RIGHT_SHIFT 243 #define SATURATE_RIGHT_SHIFT(src, scale, dBits) \ 244 ((((LONG)(src) >> (scale)) > (LONG)(((1U) << ((dBits)-1)) - 1)) \ 245 ? (LONG)(((1U) << ((dBits)-1)) - 1) \ 246 : (((LONG)(src) >> (scale)) < ~((LONG)(((1U) << ((dBits)-1)) - 1))) \ 247 ? ~((LONG)(((1U) << ((dBits)-1)) - 1)) \ 248 : ((LONG)(src) >> (scale))) 249 #endif 250 251 #ifndef SATURATE_LEFT_SHIFT 252 #define SATURATE_LEFT_SHIFT(src, scale, dBits) \ 253 (((LONG)(src) > ((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale))) \ 254 ? (LONG)(((1U) << ((dBits)-1)) - 1) \ 255 : ((LONG)(src) < ~((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale))) \ 256 ? ~((LONG)(((1U) << ((dBits)-1)) - 1)) \ 257 : ((LONG)(src) << (scale))) 258 #endif 259 260 #ifndef SATURATE_SHIFT 261 #define SATURATE_SHIFT(src, scale, dBits) \ 262 (((scale) < 0) ? SATURATE_LEFT_SHIFT((src), -(scale), (dBits)) \ 263 : SATURATE_RIGHT_SHIFT((src), (scale), (dBits))) 264 #endif 265 266 /* 267 * Alternative shift and saturate left, saturates to -0.99999 instead of -1.0000 268 * to avoid problems when inverting the sign of the result. 269 */ 270 #ifndef SATURATE_LEFT_SHIFT_ALT 271 #define SATURATE_LEFT_SHIFT_ALT(src, scale, dBits) \ 272 (((LONG)(src) > ((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale))) \ 273 ? (LONG)(((1U) << ((dBits)-1)) - 1) \ 274 : ((LONG)(src) <= ~((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale))) \ 275 ? ~((LONG)(((1U) << ((dBits)-1)) - 2)) \ 276 : ((LONG)(src) << (scale))) 277 #endif 278 279 #ifndef SATURATE_RIGHT_SHIFT_ALT 280 #define SATURATE_RIGHT_SHIFT_ALT(src, scale, dBits) \ 281 ((((LONG)(src) >> (scale)) > (LONG)(((1U) << ((dBits)-1)) - 1)) \ 282 ? (LONG)(((1U) << ((dBits)-1)) - 1) \ 283 : (((LONG)(src) >> (scale)) < ~((LONG)(((1U) << ((dBits)-1)) - 2))) \ 284 ? ~((LONG)(((1U) << ((dBits)-1)) - 2)) \ 285 : ((LONG)(src) >> (scale))) 286 #endif 287 288 #ifndef SATURATE_INT_PCM_RIGHT_SHIFT 289 #define SATURATE_INT_PCM_RIGHT_SHIFT(src, scale) \ 290 SATURATE_RIGHT_SHIFT(src, scale, SAMPLE_BITS) 291 #endif 292 293 #ifndef SATURATE_INT_PCM_LEFT_SHIFT 294 #define SATURATE_INT_PCM_LEFT_SHIFT(src, scale) \ 295 SATURATE_LEFT_SHIFT(src, scale, SAMPLE_BITS) 296 #endif 297 298 #endif /* #ifndef SCALE_H */ 299
