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Created: 2025-07-01 06:21

/src/aac/libFDK/include/fixmul.h
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/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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 1.    INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2.    COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3.    NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4.    DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5.    CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/******************* Library for basic calculation routines ********************
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   Author(s):   Stefan Gewinner
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   Description: fixed point multiplication
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*******************************************************************************/
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#if !defined(FIXMUL_H)
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#define FIXMUL_H
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#include "FDK_archdef.h"
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#include "machine_type.h"
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#if defined(__arm__)
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#include "arm/fixmul_arm.h"
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#elif defined(__mips__)
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#include "mips/fixmul_mips.h"
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#elif defined(__x86__)
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#include "x86/fixmul_x86.h"
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#endif /* all cores */
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/*************************************************************************
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 *************************************************************************
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    Software fallbacks for missing functions
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**************************************************************************
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**************************************************************************/
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#if !defined(FUNCTION_fixmuldiv2_DD)
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#define FUNCTION_fixmuldiv2_DD
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inline LONG fixmuldiv2_DD(const LONG a, const LONG b) {
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  return (LONG)((((INT64)a) * b) >> 32);
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}
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#endif
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#if !defined(FUNCTION_fixmuldiv2BitExact_DD)
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#define FUNCTION_fixmuldiv2BitExact_DD
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inline LONG fixmuldiv2BitExact_DD(const LONG a, const LONG b) {
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  return (LONG)((((INT64)a) * b) >> 32);
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}
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#endif
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#if !defined(FUNCTION_fixmul_DD)
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#define FUNCTION_fixmul_DD
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inline LONG fixmul_DD(const LONG a, const LONG b) {
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  return fixmuldiv2_DD(a, b) << 1;
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}
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#endif
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#if !defined(FUNCTION_fixmulBitExact_DD)
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#define FUNCTION_fixmulBitExact_DD
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inline LONG fixmulBitExact_DD(const LONG a, const LONG b) {
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  return ((LONG)((((INT64)a) * b) >> 32)) << 1;
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}
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#endif
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#if !defined(FUNCTION_fixmuldiv2_SS)
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#define FUNCTION_fixmuldiv2_SS
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0
inline LONG fixmuldiv2_SS(const SHORT a, const SHORT b) {
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  return ((LONG)a * b);
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0
}
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#endif
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#if !defined(FUNCTION_fixmul_SS)
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#define FUNCTION_fixmul_SS
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inline LONG fixmul_SS(const SHORT a, const SHORT b) { return (a * b) << 1; }
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#endif
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#if !defined(FUNCTION_fixmuldiv2_SD)
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#define FUNCTION_fixmuldiv2_SD
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inline LONG fixmuldiv2_SD(const SHORT a, const LONG b)
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#ifdef FUNCTION_fixmuldiv2_DS
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{
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  return fixmuldiv2_DS(b, a);
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}
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#else
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{
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  return fixmuldiv2_DD(FX_SGL2FX_DBL(a), b);
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0
}
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#endif
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#endif
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#if !defined(FUNCTION_fixmuldiv2_DS)
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#define FUNCTION_fixmuldiv2_DS
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inline LONG fixmuldiv2_DS(const LONG a, const SHORT b)
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#ifdef FUNCTION_fixmuldiv2_SD
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{
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  return fixmuldiv2_SD(b, a);
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}
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#else
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{
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  return fixmuldiv2_DD(a, FX_SGL2FX_DBL(b));
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}
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#endif
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#endif
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#if !defined(FUNCTION_fixmuldiv2BitExact_SD)
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#define FUNCTION_fixmuldiv2BitExact_SD
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inline LONG fixmuldiv2BitExact_SD(const SHORT a, const LONG b)
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#ifdef FUNCTION_fixmuldiv2BitExact_DS
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{
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  return fixmuldiv2BitExact_DS(b, a);
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}
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#else
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{
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  return (LONG)((((INT64)a) * b) >> 16);
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}
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#endif
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#endif
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#if !defined(FUNCTION_fixmuldiv2BitExact_DS)
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#define FUNCTION_fixmuldiv2BitExact_DS
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inline LONG fixmuldiv2BitExact_DS(const LONG a, const SHORT b)
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#ifdef FUNCTION_fixmuldiv2BitExact_SD
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{
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  return fixmuldiv2BitExact_SD(b, a);
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}
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#else
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{
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  return (LONG)((((INT64)a) * b) >> 16);
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}
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#endif
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#endif
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#if !defined(FUNCTION_fixmul_SD)
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#define FUNCTION_fixmul_SD
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inline LONG fixmul_SD(const SHORT a, const LONG b) {
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#ifdef FUNCTION_fixmul_DS
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  return fixmul_DS(b, a);
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#else
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  return fixmuldiv2_SD(a, b) << 1;
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#endif
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}
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#endif
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#if !defined(FUNCTION_fixmul_DS)
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#define FUNCTION_fixmul_DS
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inline LONG fixmul_DS(const LONG a, const SHORT b) {
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#ifdef FUNCTION_fixmul_SD
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  return fixmul_SD(b, a);
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#else
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  return fixmuldiv2_DS(a, b) << 1;
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#endif
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}
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#endif
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#if !defined(FUNCTION_fixmulBitExact_SD)
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#define FUNCTION_fixmulBitExact_SD
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inline LONG fixmulBitExact_SD(const SHORT a, const LONG b)
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#ifdef FUNCTION_fixmulBitExact_DS
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{
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  return fixmulBitExact_DS(b, a);
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}
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#else
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{
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  return (LONG)(((((INT64)a) * b) >> 16) << 1);
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}
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#endif
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#endif
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#if !defined(FUNCTION_fixmulBitExact_DS)
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#define FUNCTION_fixmulBitExact_DS
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inline LONG fixmulBitExact_DS(const LONG a, const SHORT b)
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#ifdef FUNCTION_fixmulBitExact_SD
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{
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  return fixmulBitExact_SD(b, a);
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}
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#else
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{
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  return (LONG)(((((INT64)a) * b) >> 16) << 1);
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}
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#endif
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#endif
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#if !defined(FUNCTION_fixpow2div2_D)
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#define FUNCTION_fixpow2div2_D
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inline LONG fixpow2div2_D(const LONG a) { return fixmuldiv2_DD(a, a); }
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#endif
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#if !defined(FUNCTION_fixpow2_D)
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#define FUNCTION_fixpow2_D
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inline LONG fixpow2_D(const LONG a) { return fixpow2div2_D(a) << 1; }
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#endif
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#if !defined(FUNCTION_fixpow2div2_S)
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#define FUNCTION_fixpow2div2_S
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inline LONG fixpow2div2_S(const SHORT a) { return fixmuldiv2_SS(a, a); }
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#endif
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#if !defined(FUNCTION_fixpow2_S)
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#define FUNCTION_fixpow2_S
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inline LONG fixpow2_S(const SHORT a) {
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  LONG result = fixpow2div2_S(a) << 1;
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  return result ^ (result >> 31);
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}
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#endif
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#endif /* FIXMUL_H */