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Diffstat (limited to 'fdk-aac/libFDK/include/x86/fixpoint_math_x86.h')
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diff --git a/fdk-aac/libFDK/include/x86/fixpoint_math_x86.h b/fdk-aac/libFDK/include/x86/fixpoint_math_x86.h new file mode 100644 index 0000000..d81fb26 --- /dev/null +++ b/fdk-aac/libFDK/include/x86/fixpoint_math_x86.h @@ -0,0 +1,208 @@ +/* ----------------------------------------------------------------------------- +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) */ |