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Diffstat (limited to 'libSBRdec/src/transcendent.h')
| -rw-r--r-- | libSBRdec/src/transcendent.h | 279 |
1 files changed, 148 insertions, 131 deletions
diff --git a/libSBRdec/src/transcendent.h b/libSBRdec/src/transcendent.h index ad88bc9..0e815c2 100644 --- a/libSBRdec/src/transcendent.h +++ b/libSBRdec/src/transcendent.h @@ -1,74 +1,85 @@ - -/* ----------------------------------------------------------------------------------------------------------- +/* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android -© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. - All rights reserved. +© 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. +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: +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 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 +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. +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. +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." +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. +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. +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. +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 @@ -79,15 +90,23 @@ Am Wolfsmantel 33 www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ------------------------------------------------------------------------------------------------------------ */ +----------------------------------------------------------------------------- */ + +/**************************** SBR decoder library ****************************** + + Author(s): + + Description: + +*******************************************************************************/ /*! \file - \brief FDK Fixed Point Arithmetic Library Interface + \brief FDK Fixed Point Arithmetic Library Interface */ -#ifndef __TRANSCENDENT_H -#define __TRANSCENDENT_H +#ifndef TRANSCENDENT_H +#define TRANSCENDENT_H #include "sbrdecoder.h" #include "sbr_rom.h" @@ -105,10 +124,9 @@ amm-info@iis.fraunhofer.de static inline FIXP_SGL FDK_getNumOctavesDiv8(INT a, /*!< lower band */ INT b) /*!< upper band */ { - return ( (SHORT)((LONG)(CalcLdInt(b) - CalcLdInt(a))>>(FRACT_BITS-3)) ); + return ((SHORT)((LONG)(CalcLdInt(b) - CalcLdInt(a)) >> (FRACT_BITS - 3))); } - /************************************************************************/ /*! \brief Add two values given by mantissa and exponent. @@ -118,15 +136,15 @@ static inline FIXP_SGL FDK_getNumOctavesDiv8(INT a, /*!< lower band */ */ /************************************************************************/ inline void FDK_add_MantExp(FIXP_SGL a_m, /*!< Mantissa of 1st operand a */ - SCHAR a_e, /*!< Exponent of 1st operand a */ - FIXP_SGL b_m, /*!< Mantissa of 2nd operand b */ - SCHAR b_e, /*!< Exponent of 2nd operand b */ - FIXP_SGL *ptrSum_m, /*!< Mantissa of result */ - SCHAR *ptrSum_e) /*!< Exponent of result */ + SCHAR a_e, /*!< Exponent of 1st operand a */ + FIXP_SGL b_m, /*!< Mantissa of 2nd operand b */ + SCHAR b_e, /*!< Exponent of 2nd operand b */ + FIXP_SGL *ptrSum_m, /*!< Mantissa of result */ + SCHAR *ptrSum_e) /*!< Exponent of result */ { FIXP_DBL accu; - int shift; - int shiftAbs; + int shift; + int shiftAbs; FIXP_DBL shiftedMantissa; FIXP_DBL otherMantissa; @@ -137,34 +155,35 @@ inline void FDK_add_MantExp(FIXP_SGL a_m, /*!< Mantissa of 1st operand a */ shift = (int)(a_e - b_e); - shiftAbs = (shift>0)? shift : -shift; - shiftAbs = (shiftAbs < DFRACT_BITS-1)? shiftAbs : DFRACT_BITS-1; - shiftedMantissa = (shift>0)? (FX_SGL2FX_DBL(b_m) >> shiftAbs) : (FX_SGL2FX_DBL(a_m) >> shiftAbs); - otherMantissa = (shift>0)? FX_SGL2FX_DBL(a_m) : FX_SGL2FX_DBL(b_m); - *ptrSum_e = (shift>0)? a_e : b_e; + shiftAbs = (shift > 0) ? shift : -shift; + shiftAbs = (shiftAbs < DFRACT_BITS - 1) ? shiftAbs : DFRACT_BITS - 1; + shiftedMantissa = (shift > 0) ? (FX_SGL2FX_DBL(b_m) >> shiftAbs) + : (FX_SGL2FX_DBL(a_m) >> shiftAbs); + otherMantissa = (shift > 0) ? FX_SGL2FX_DBL(a_m) : FX_SGL2FX_DBL(b_m); + *ptrSum_e = (shift > 0) ? a_e : b_e; accu = (shiftedMantissa >> 1) + (otherMantissa >> 1); /* shift by 1 bit to avoid overflow */ - if ( (accu >= (FL2FXCONST_DBL(0.5f) - (FIXP_DBL)1)) || (accu <= FL2FXCONST_DBL(-0.5f)) ) + if ((accu >= (FL2FXCONST_DBL(0.5f) - (FIXP_DBL)1)) || + (accu <= FL2FXCONST_DBL(-0.5f))) *ptrSum_e += 1; else accu = (shiftedMantissa + otherMantissa); *ptrSum_m = FX_DBL2FX_SGL(accu); - } -inline void FDK_add_MantExp(FIXP_DBL a, /*!< Mantissa of 1st operand a */ - SCHAR a_e, /*!< Exponent of 1st operand a */ - FIXP_DBL b, /*!< Mantissa of 2nd operand b */ - SCHAR b_e, /*!< Exponent of 2nd operand b */ - FIXP_DBL *ptrSum, /*!< Mantissa of result */ - SCHAR *ptrSum_e) /*!< Exponent of result */ +inline void FDK_add_MantExp(FIXP_DBL a, /*!< Mantissa of 1st operand a */ + SCHAR a_e, /*!< Exponent of 1st operand a */ + FIXP_DBL b, /*!< Mantissa of 2nd operand b */ + SCHAR b_e, /*!< Exponent of 2nd operand b */ + FIXP_DBL *ptrSum, /*!< Mantissa of result */ + SCHAR *ptrSum_e) /*!< Exponent of result */ { FIXP_DBL accu; - int shift; - int shiftAbs; + int shift; + int shiftAbs; FIXP_DBL shiftedMantissa; FIXP_DBL otherMantissa; @@ -175,22 +194,22 @@ inline void FDK_add_MantExp(FIXP_DBL a, /*!< Mantissa of 1st operand a */ shift = (int)(a_e - b_e); - shiftAbs = (shift>0)? shift : -shift; - shiftAbs = (shiftAbs < DFRACT_BITS-1)? shiftAbs : DFRACT_BITS-1; - shiftedMantissa = (shift>0)? (b >> shiftAbs) : (a >> shiftAbs); - otherMantissa = (shift>0)? a : b; - *ptrSum_e = (shift>0)? a_e : b_e; + shiftAbs = (shift > 0) ? shift : -shift; + shiftAbs = (shiftAbs < DFRACT_BITS - 1) ? shiftAbs : DFRACT_BITS - 1; + shiftedMantissa = (shift > 0) ? (b >> shiftAbs) : (a >> shiftAbs); + otherMantissa = (shift > 0) ? a : b; + *ptrSum_e = (shift > 0) ? a_e : b_e; accu = (shiftedMantissa >> 1) + (otherMantissa >> 1); /* shift by 1 bit to avoid overflow */ - if ( (accu >= (FL2FXCONST_DBL(0.5f) - (FIXP_DBL)1)) || (accu <= FL2FXCONST_DBL(-0.5f)) ) + if ((accu >= (FL2FXCONST_DBL(0.5f) - (FIXP_DBL)1)) || + (accu <= FL2FXCONST_DBL(-0.5f))) *ptrSum_e += 1; else accu = (shiftedMantissa + otherMantissa); *ptrSum = accu; - } /************************************************************************/ @@ -204,17 +223,18 @@ inline void FDK_add_MantExp(FIXP_DBL a, /*!< Mantissa of 1st operand a */ which limits accuracy. */ /************************************************************************/ -static inline void FDK_divide_MantExp(FIXP_SGL a_m, /*!< Mantissa of dividend a */ - SCHAR a_e, /*!< Exponent of dividend a */ - FIXP_SGL b_m, /*!< Mantissa of divisor b */ - SCHAR b_e, /*!< Exponent of divisor b */ - FIXP_SGL *ptrResult_m, /*!< Mantissa of quotient a/b */ - SCHAR *ptrResult_e) /*!< Exponent of quotient a/b */ +static inline void FDK_divide_MantExp( + FIXP_SGL a_m, /*!< Mantissa of dividend a */ + SCHAR a_e, /*!< Exponent of dividend a */ + FIXP_SGL b_m, /*!< Mantissa of divisor b */ + SCHAR b_e, /*!< Exponent of divisor b */ + FIXP_SGL *ptrResult_m, /*!< Mantissa of quotient a/b */ + SCHAR *ptrResult_e) /*!< Exponent of quotient a/b */ { int preShift, postShift, index, shift; FIXP_DBL ratio_m; - FIXP_SGL bInv_m = FL2FXCONST_SGL(0.0f); + FIXP_SGL bInv_m = FL2FXCONST_SGL(0.0f); preShift = CntLeadingZeros(FX_SGL2FX_DBL(b_m)); @@ -236,41 +256,41 @@ static inline void FDK_divide_MantExp(FIXP_SGL a_m, /*!< Mantissa of d */ shift = (FRACT_BITS - 2 - INV_TABLE_BITS - preShift); - index = (shift<0)? (LONG)b_m << (-shift) : (LONG)b_m >> shift; - + index = (shift < 0) ? (LONG)b_m << (-shift) : (LONG)b_m >> shift; /* The index has INV_TABLE_BITS +1 valid bits here. Clear the other bits. */ - index &= (1 << (INV_TABLE_BITS+1)) - 1; + index &= (1 << (INV_TABLE_BITS + 1)) - 1; - /* Remove offset of half an interval */ + /* Remove offset of half an interval */ index--; - /* Now the lowest bit is shifted out */ + /* Now the lowest bit is shifted out */ index = index >> 1; - /* Fetch inversed mantissa from table: */ - bInv_m = (index<0)? bInv_m : FDK_sbrDecoder_invTable[index]; + /* Fetch inversed mantissa from table: */ + bInv_m = (index < 0) ? bInv_m : FDK_sbrDecoder_invTable[index]; - /* Multiply a with the inverse of b: */ - ratio_m = (index<0)? FX_SGL2FX_DBL(a_m >> 1) : fMultDiv2(bInv_m,a_m); + /* Multiply a with the inverse of b: */ + ratio_m = (index < 0) ? FX_SGL2FX_DBL(a_m >> 1) : fMultDiv2(bInv_m, a_m); - postShift = CntLeadingZeros(ratio_m)-1; + postShift = CntLeadingZeros(ratio_m) - 1; *ptrResult_m = FX_DBL2FX_SGL(ratio_m << postShift); *ptrResult_e = a_e - b_e + 1 + preShift - postShift; } -static inline void FDK_divide_MantExp(FIXP_DBL a_m, /*!< Mantissa of dividend a */ - SCHAR a_e, /*!< Exponent of dividend a */ - FIXP_DBL b_m, /*!< Mantissa of divisor b */ - SCHAR b_e, /*!< Exponent of divisor b */ - FIXP_DBL *ptrResult_m, /*!< Mantissa of quotient a/b */ - SCHAR *ptrResult_e) /*!< Exponent of quotient a/b */ +static inline void FDK_divide_MantExp( + FIXP_DBL a_m, /*!< Mantissa of dividend a */ + SCHAR a_e, /*!< Exponent of dividend a */ + FIXP_DBL b_m, /*!< Mantissa of divisor b */ + SCHAR b_e, /*!< Exponent of divisor b */ + FIXP_DBL *ptrResult_m, /*!< Mantissa of quotient a/b */ + SCHAR *ptrResult_e) /*!< Exponent of quotient a/b */ { int preShift, postShift, index, shift; FIXP_DBL ratio_m; - FIXP_SGL bInv_m = FL2FXCONST_SGL(0.0f); + FIXP_SGL bInv_m = FL2FXCONST_SGL(0.0f); preShift = CntLeadingZeros(b_m); @@ -292,25 +312,24 @@ static inline void FDK_divide_MantExp(FIXP_DBL a_m, /*!< Mantissa of d */ shift = (DFRACT_BITS - 2 - INV_TABLE_BITS - preShift); - index = (shift<0)? (LONG)b_m << (-shift) : (LONG)b_m >> shift; - + index = (shift < 0) ? (LONG)b_m << (-shift) : (LONG)b_m >> shift; /* The index has INV_TABLE_BITS +1 valid bits here. Clear the other bits. */ - index &= (1 << (INV_TABLE_BITS+1)) - 1; + index &= (1 << (INV_TABLE_BITS + 1)) - 1; - /* Remove offset of half an interval */ + /* Remove offset of half an interval */ index--; - /* Now the lowest bit is shifted out */ + /* Now the lowest bit is shifted out */ index = index >> 1; - /* Fetch inversed mantissa from table: */ - bInv_m = (index<0)? bInv_m : FDK_sbrDecoder_invTable[index]; + /* Fetch inversed mantissa from table: */ + bInv_m = (index < 0) ? bInv_m : FDK_sbrDecoder_invTable[index]; - /* Multiply a with the inverse of b: */ - ratio_m = (index<0)? (a_m >> 1) : fMultDiv2(bInv_m,a_m); + /* Multiply a with the inverse of b: */ + ratio_m = (index < 0) ? (a_m >> 1) : fMultDiv2(bInv_m, a_m); - postShift = CntLeadingZeros(ratio_m)-1; + postShift = CntLeadingZeros(ratio_m) - 1; *ptrResult_m = ratio_m << postShift; *ptrResult_e = a_e - b_e + 1 + preShift - postShift; @@ -326,30 +345,28 @@ static inline void FDK_divide_MantExp(FIXP_DBL a_m, /*!< Mantissa of d For performance reasons, the square root is based on a table lookup which limits accuracy. */ -static inline void FDK_sqrt_MantExp(FIXP_DBL *mantissa, /*!< Pointer to mantissa */ - SCHAR *exponent, - const SCHAR *destScale) -{ +static inline void FDK_sqrt_MantExp( + FIXP_DBL *mantissa, /*!< Pointer to mantissa */ + SCHAR *exponent, const SCHAR *destScale) { FIXP_DBL input_m = *mantissa; - int input_e = (int) *exponent; + int input_e = (int)*exponent; FIXP_DBL result = FL2FXCONST_DBL(0.0f); - int result_e = -FRACT_BITS; + int result_e = -FRACT_BITS; /* Call lookup square root, which does internally normalization. */ - result = sqrtFixp_lookup(input_m, &input_e); + result = sqrtFixp_lookup(input_m, &input_e); result_e = input_e; /* Write result */ - if (exponent==destScale) { + if (exponent == destScale) { *mantissa = result; *exponent = result_e; } else { int shift = result_e - *destScale; - *mantissa = (shift>=0) ? result << (INT)fixMin(DFRACT_BITS-1,shift) - : result >> (INT)fixMin(DFRACT_BITS-1,-shift); + *mantissa = (shift >= 0) ? result << (INT)fixMin(DFRACT_BITS - 1, shift) + : result >> (INT)fixMin(DFRACT_BITS - 1, -shift); *exponent = *destScale; } } - #endif |