| /* ----------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten |
| Forschung e.V. All rights reserved. |
| |
| 1. INTRODUCTION |
| The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software |
| that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding |
| scheme for digital audio. This FDK AAC Codec software is intended to be used on |
| a wide variety of Android devices. |
| |
| AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient |
| general perceptual audio codecs. AAC-ELD is considered the best-performing |
| full-bandwidth communications codec by independent studies and is widely |
| deployed. AAC has been standardized by ISO and IEC as part of the MPEG |
| specifications. |
| |
| Patent licenses for necessary patent claims for the FDK AAC Codec (including |
| those of Fraunhofer) may be obtained through Via Licensing |
| (www.vialicensing.com) or through the respective patent owners individually for |
| the purpose of encoding or decoding bit streams in products that are compliant |
| with the ISO/IEC MPEG audio standards. Please note that most manufacturers of |
| Android devices already license these patent claims through Via Licensing or |
| directly from the patent owners, and therefore FDK AAC Codec software may |
| already be covered under those patent licenses when it is used for those |
| licensed purposes only. |
| |
| Commercially-licensed AAC software libraries, including floating-point versions |
| with enhanced sound quality, are also available from Fraunhofer. Users are |
| encouraged to check the Fraunhofer website for additional applications |
| information and documentation. |
| |
| 2. COPYRIGHT LICENSE |
| |
| Redistribution and use in source and binary forms, with or without modification, |
| are permitted without payment of copyright license fees provided that you |
| satisfy the following conditions: |
| |
| You must retain the complete text of this software license in redistributions of |
| the FDK AAC Codec or your modifications thereto in source code form. |
| |
| You must retain the complete text of this software license in the documentation |
| and/or other materials provided with redistributions of the FDK AAC Codec or |
| your modifications thereto in binary form. You must make available free of |
| charge copies of the complete source code of the FDK AAC Codec and your |
| modifications thereto to recipients of copies in binary form. |
| |
| The name of Fraunhofer may not be used to endorse or promote products derived |
| from this library without prior written permission. |
| |
| You may not charge copyright license fees for anyone to use, copy or distribute |
| the FDK AAC Codec software or your modifications thereto. |
| |
| Your modified versions of the FDK AAC Codec must carry prominent notices stating |
| that you changed the software and the date of any change. For modified versions |
| of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" |
| must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK |
| AAC Codec Library for Android." |
| |
| 3. NO PATENT LICENSE |
| |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without |
| limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. |
| Fraunhofer provides no warranty of patent non-infringement with respect to this |
| software. |
| |
| You may use this FDK AAC Codec software or modifications thereto only for |
| purposes that are authorized by appropriate patent licenses. |
| |
| 4. DISCLAIMER |
| |
| This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright |
| holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, |
| including but not limited to the implied warranties of merchantability and |
| fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, |
| or consequential damages, including but not limited to procurement of substitute |
| goods or services; loss of use, data, or profits, or business interruption, |
| however caused and on any theory of liability, whether in contract, strict |
| liability, or tort (including negligence), arising in any way out of the use of |
| this software, even if advised of the possibility of such damage. |
| |
| 5. CONTACT INFORMATION |
| |
| Fraunhofer Institute for Integrated Circuits IIS |
| Attention: Audio and Multimedia Departments - FDK AAC LL |
| Am Wolfsmantel 33 |
| 91058 Erlangen, Germany |
| |
| www.iis.fraunhofer.de/amm |
| amm-info@iis.fraunhofer.de |
| ----------------------------------------------------------------------------- */ |
| |
| /******************* Library for basic calculation routines ******************** |
| |
| Author(s): Manuel Jander |
| |
| Description: Fixed point specific mathematical functions for x86 |
| |
| *******************************************************************************/ |
| |
| #if !defined(FIXPOINT_MATH_X86_H) |
| #define FIXPOINT_MATH_X86_H |
| |
| #define FUNCTION_sqrtFixp |
| |
| #include <math.h> |
| |
| #ifdef FUNCTION_sqrtFixp |
| static inline FIXP_DBL sqrtFixp(const FIXP_DBL op) { |
| FIXP_DBL result; |
| /* result = |
| * (FIXP_DBL)(INT)(sqrt((double)(INT)op)*46340.950011841578559133736114903); |
| */ |
| result = (FIXP_DBL)(INT)(sqrt((float)(INT)op) * 46340.9492f); |
| FDK_ASSERT(result >= (FIXP_DBL)0); |
| return result; |
| } |
| #endif /* FUNCTION_sqrtFixp */ |
| |
| #include <math.h> |
| |
| #define FUNCTION_invSqrtNorm2 |
| /** |
| * \brief calculate 1.0/sqrt(op) |
| * \param op_m mantissa of input value. |
| * \param result_e pointer to return the exponent of the result |
| * \return mantissa of the result |
| */ |
| #ifdef FUNCTION_invSqrtNorm2 |
| inline FIXP_DBL invSqrtNorm2(FIXP_DBL op_m, INT *result_e) { |
| float result; |
| if (op_m == (FIXP_DBL)0) { |
| *result_e = 16; |
| return ((LONG)0x7fffffff); |
| } |
| result = (float)(1.0 / sqrt(0.5f * (float)(INT)op_m)); |
| result = (float)ldexp(frexpf(result, result_e), DFRACT_BITS - 1); |
| *result_e += 15; |
| |
| FDK_ASSERT(result >= 0); |
| return (FIXP_DBL)(INT)result; |
| } |
| #endif /* FUNCTION_invSqrtNorm2 */ |
| |
| #define FUNCTION_invFixp |
| /** |
| * \brief calculate 1.0/op |
| * \param op mantissa of the input value. |
| * \return mantissa of the result with implizit exponent of 31 |
| */ |
| #ifdef FUNCTION_invFixp |
| inline FIXP_DBL invFixp(FIXP_DBL op) { |
| float result; |
| INT result_e; |
| if ((op == (FIXP_DBL)0) || (op == (FIXP_DBL)1)) { |
| return ((LONG)0x7fffffff); |
| } |
| result = (float)(1.0 / (float)(INT)op); |
| result = frexpf(result, &result_e); |
| result = ldexpf(result, 31 + result_e); |
| |
| return (FIXP_DBL)(INT)result; |
| } |
| |
| /** |
| * \brief calculate 1.0/(op_m * 2^op_e) |
| * \param op_m mantissa of the input value. |
| * \param op_e pointer into were the exponent of the input value is stored, and |
| * the result will be stored into. |
| * \return mantissa of the result |
| */ |
| inline FIXP_DBL invFixp(FIXP_DBL op_m, int *op_e) { |
| float result; |
| INT result_e; |
| if ((op_m == (FIXP_DBL)0x00000000) || (op_m == (FIXP_DBL)0x00000001)) { |
| *op_e = 31 - *op_e; |
| return ((LONG)0x7fffffff); |
| } |
| result = (float)(1.0 / (float)(INT)op_m); |
| result = ldexpf(frexpf(result, &result_e), DFRACT_BITS - 1); |
| *op_e = result_e - *op_e + 31; |
| return (FIXP_DBL)(INT)result; |
| } |
| #endif /* FUNCTION_invFixp */ |
| |
| #define FUNCTION_schur_div |
| /** |
| * \brief Divide two FIXP_DBL values with given precision. |
| * \param num dividend |
| * \param denum divisor |
| * \param count amount of significant bits of the result (starting to the MSB) |
| * \return num/divisor |
| */ |
| #ifdef FUNCTION_schur_div |
| inline FIXP_DBL schur_div(FIXP_DBL num, FIXP_DBL denum, INT count) { |
| (void)count; |
| /* same asserts than for fallback implementation */ |
| FDK_ASSERT(num >= (FIXP_DBL)0); |
| FDK_ASSERT(denum > (FIXP_DBL)0); |
| FDK_ASSERT(num <= denum); |
| |
| return (num == denum) ? (FIXP_DBL)MAXVAL_DBL |
| : (FIXP_DBL)(INT)(((INT64)(INT)num << 31) / (INT)denum); |
| } |
| #endif /* FUNCTION_schur_div */ |
| #endif /* !defined(FIXPOINT_MATH_X86_H) */ |