fixmul_x86.h - Android社区 - https://www.androidos.net.cn/

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

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
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Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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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.

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Redistribution and use in source and binary forms, with or without modification, are permitted without
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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
----------------------------------------------------------------------------------------------------------- */

/***************************  Fraunhofer IIS FDK Tools  **********************

Author(s):
   Description: fixed point intrinsics

******************************************************************************/

#if defined(__x86__)

#if defined(_MSC_VER) && defined(_M_IX86)
/* Intel x86 */

#define FUNCTION_fixmul_DD
#define FUNCTION_fixmuldiv2_DD
#define FUNCTION_fixmuldiv2BitExact_DD
#define fixmuldiv2BitExact_DD(a,b) fixmuldiv2_DD(a,b)
#define FUNCTION_fixmulBitExact_DD
#define fixmulBitExact_DD(a,b) fixmul_DD(a,b)

#define FUNCTION_fixmuldiv2BitExact_DS
#define fixmuldiv2BitExact_DS(a,b) fixmuldiv2_DS(a,b)

#define FUNCTION_fixmulBitExact_DS
#define fixmulBitExact_DS(a,b) fixmul_DS(a,b)

inline INT fixmul_DD (INT a, const INT b)
{
  __asm
  {
    mov eax, a
    imul b
    shl edx, 1
    mov a, edx
  }
  return a ;
}

inline INT fixmuldiv2_DD (INT a, const INT b)
{
  __asm
  {
    mov eax, a
    imul b
    mov a, edx
  }
  return a ;
}

/* ############################################################################# */
#elif (defined(__GNUC__)||defined(__gnu_linux__)) && defined(__x86__)

#define FUNCTION_fixmul_DD
#define FUNCTION_fixmuldiv2_DD

#define FUNCTION_fixmuldiv2BitExact_DD
#define fixmuldiv2BitExact_DD(a,b) fixmuldiv2_DD(a,b)

#define FUNCTION_fixmulBitExact_DD
#define fixmulBitExact_DD(a,b) fixmul_DD(a,b)

#define FUNCTION_fixmuldiv2BitExact_DS
#define fixmuldiv2BitExact_DS(a,b) fixmuldiv2_DS(a,b)

#define FUNCTION_fixmulBitExact_DS
#define fixmulBitExact_DS(a,b) fixmul_DS(a,b)

inline INT fixmul_DD (INT a, const INT b)
{
  INT result;

asm( "imul %2;\n"
       "shl $1, %0;\n"
            : "=d"(result), "+a"(a)
            : "r"(b) );

return result;
}

inline INT fixmuldiv2_DD (INT a, const INT b)
{
  INT result;

asm ( "imul %2;"
             : "=d"(result), "+a"(a)
             : "r"(b) );

return result;
}

#endif /* (defined(__GNUC__)||defined(__gnu_linux__)) && defined(__x86__) */

#endif /* __x86__ */

C++程序 | 179行 | 6.49 KB

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