| /* ----------------------------------------------------------------------------- |
| 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): Haricharan Lakshman, Manuel Jander |
| |
| Description: Trigonometric functions fixed point fractional implementation. |
| |
| *******************************************************************************/ |
| |
| #if !defined(FDK_TRIGFCTS_H) |
| #define FDK_TRIGFCTS_H |
| |
| #include "common_fix.h" |
| |
| #include "FDK_tools_rom.h" |
| |
| /* Fixed point precision definitions */ |
| #define Q(format) ((FIXP_DBL)(((LONG)1) << (format))) |
| |
| #ifndef M_PI |
| #define M_PI (3.14159265358979323846f) |
| #endif |
| |
| /*! |
| * Inverse tangent function. |
| */ |
| |
| /* --- fixp_atan() ---- */ |
| #define Q_ATANINP (25) // Input in q25, Output in q30 |
| #define Q_ATANOUT (30) |
| #define ATI_SF ((DFRACT_BITS - 1) - Q_ATANINP) /* 6 */ |
| #define ATI_SCALE ((float)(1 << ATI_SF)) |
| #define ATO_SF ((DFRACT_BITS - 1) - Q_ATANOUT) /* 1 ] -pi/2 .. pi/2 [ */ |
| #define ATO_SCALE ((float)(1 << ATO_SF)) |
| /* --- fixp_atan2() --- */ |
| #define Q_ATAN2OUT (29) |
| #define AT2O_SF ((DFRACT_BITS - 1) - Q_ATAN2OUT) /* 2 ] -pi .. pi ] */ |
| #define AT2O_SCALE ((float)(1 << AT2O_SF)) |
| // -------------------- |
| |
| FIXP_DBL fixp_atan(FIXP_DBL x); |
| FIXP_DBL fixp_atan2(FIXP_DBL y, FIXP_DBL x); |
| |
| FIXP_DBL fixp_cos(FIXP_DBL x, int scale); |
| FIXP_DBL fixp_sin(FIXP_DBL x, int scale); |
| |
| #define FIXP_COS_SIN |
| |
| #include "FDK_tools_rom.h" |
| |
| #define SINETAB SineTable512 |
| #define LD 9 |
| |
| #ifndef FUNCTION_inline_fixp_cos_sin |
| |
| #define FUNCTION_inline_fixp_cos_sin |
| |
| /* |
| * Calculates coarse lookup index and sign for sine. |
| * Returns delta x residual. |
| */ |
| static inline FIXP_DBL fixp_sin_cos_residual_inline(FIXP_DBL x, int scale, |
| FIXP_DBL *sine, |
| FIXP_DBL *cosine) { |
| FIXP_DBL residual; |
| int s; |
| int shift = (31 - scale - LD - 1); |
| int ssign = 1; |
| int csign = 1; |
| |
| residual = fMult(x, FL2FXCONST_DBL(1.0 / M_PI)); |
| s = ((LONG)residual) >> shift; |
| |
| residual &= ((1 << shift) - 1); |
| residual = fMult(residual, FL2FXCONST_DBL(M_PI / 4.0)) << 2; |
| residual <<= scale; |
| |
| /* Sine sign symmetry */ |
| if (s & ((1 << LD) << 1)) { |
| ssign = -ssign; |
| } |
| /* Cosine sign symmetry */ |
| if ((s + (1 << LD)) & ((1 << LD) << 1)) { |
| csign = -csign; |
| } |
| |
| s = fAbs(s); |
| |
| s &= (((1 << LD) << 1) - 1); /* Modulo PI */ |
| |
| if (s > (1 << LD)) { |
| s = ((1 << LD) << 1) - s; |
| } |
| |
| { |
| LONG sl, cl; |
| /* Because of packed table */ |
| if (s > (1 << (LD - 1))) { |
| FIXP_STP tmp; |
| /* Cosine/Sine simetry for angles greater than PI/4 */ |
| s = (1 << LD) - s; |
| tmp = SINETAB[s]; |
| sl = (LONG)tmp.v.re; |
| cl = (LONG)tmp.v.im; |
| } else { |
| FIXP_STP tmp; |
| tmp = SINETAB[s]; |
| sl = (LONG)tmp.v.im; |
| cl = (LONG)tmp.v.re; |
| } |
| |
| #ifdef SINETABLE_16BIT |
| *sine = (FIXP_DBL)((sl * ssign) << (DFRACT_BITS - FRACT_BITS)); |
| *cosine = (FIXP_DBL)((cl * csign) << (DFRACT_BITS - FRACT_BITS)); |
| #else |
| /* scale down by 1 for overflow prevention. This is undone at the calling |
| * function. */ |
| *sine = (FIXP_DBL)(sl * ssign) >> 1; |
| *cosine = (FIXP_DBL)(cl * csign) >> 1; |
| #endif |
| } |
| |
| return residual; |
| } |
| |
| /** |
| * \brief Calculate cosine and sine value each of 2 angles different angle |
| * values. |
| * \param x1 first angle value |
| * \param x2 second angle value |
| * \param scale exponent of x1 and x2 |
| * \param out pointer to 4 FIXP_DBL locations, were the values cos(x1), sin(x1), |
| * cos(x2), sin(x2) will be stored into. |
| */ |
| static inline void inline_fixp_cos_sin(FIXP_DBL x1, FIXP_DBL x2, |
| const int scale, FIXP_DBL *out) { |
| FIXP_DBL residual, error0, error1, sine, cosine; |
| residual = fixp_sin_cos_residual_inline(x1, scale, &sine, &cosine); |
| error0 = fMultDiv2(sine, residual); |
| error1 = fMultDiv2(cosine, residual); |
| |
| #ifdef SINETABLE_16BIT |
| *out++ = cosine - (error0 << 1); |
| *out++ = sine + (error1 << 1); |
| #else |
| /* Undo downscaling by 1 which was done at fixp_sin_cos_residual_inline */ |
| *out++ = SATURATE_LEFT_SHIFT(cosine - (error0 << 1), 1, DFRACT_BITS); |
| *out++ = SATURATE_LEFT_SHIFT(sine + (error1 << 1), 1, DFRACT_BITS); |
| #endif |
| |
| residual = fixp_sin_cos_residual_inline(x2, scale, &sine, &cosine); |
| error0 = fMultDiv2(sine, residual); |
| error1 = fMultDiv2(cosine, residual); |
| |
| #ifdef SINETABLE_16BIT |
| *out++ = cosine - (error0 << 1); |
| *out++ = sine + (error1 << 1); |
| #else |
| *out++ = SATURATE_LEFT_SHIFT(cosine - (error0 << 1), 1, DFRACT_BITS); |
| *out++ = SATURATE_LEFT_SHIFT(sine + (error1 << 1), 1, DFRACT_BITS); |
| #endif |
| } |
| #endif |
| |
| #endif /* !defined(FDK_TRIGFCTS_H) */ |