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Merge remote-tracking branch 'aosp/master'
This commit is contained in:
Martin Storsjo
@@ -1,74 +1,85 @@
|
||||
|
||||
/* -----------------------------------------------------------------------------------------------------------
|
||||
/* -----------------------------------------------------------------------------
|
||||
Software License for The Fraunhofer FDK AAC Codec Library for Android
|
||||
|
||||
<EFBFBD> Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F<EFBFBD>rderung 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.
|
||||
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.
|
||||
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.
|
||||
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.
|
||||
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
|
||||
|
||||
@@ -79,17 +90,18 @@ Am Wolfsmantel 33
|
||||
|
||||
www.iis.fraunhofer.de/amm
|
||||
amm-info@iis.fraunhofer.de
|
||||
----------------------------------------------------------------------------------------------------------- */
|
||||
----------------------------------------------------------------------------- */
|
||||
|
||||
/*************************** Fraunhofer IIS FDK Tools **********************
|
||||
/******************* Library for basic calculation routines ********************
|
||||
|
||||
Author(s): Josef Hoepfl, DSP Solutions
|
||||
|
||||
Description: Fix point FFT
|
||||
|
||||
******************************************************************************/
|
||||
*******************************************************************************/
|
||||
|
||||
#ifndef __FFT_H__
|
||||
#define __FFT_H__
|
||||
#ifndef FFT_H
|
||||
#define FFT_H
|
||||
|
||||
#include "common_fix.h"
|
||||
|
||||
@@ -97,10 +109,10 @@ amm-info@iis.fraunhofer.de
|
||||
* \brief Perform an inplace complex valued FFT of length 2^n
|
||||
*
|
||||
* \param length Length of the FFT to be calculated.
|
||||
* \param pInput Input/Output data buffer. The input data must have at least 1 bit scale headroom.
|
||||
* The values are interleaved, real/imag pairs.
|
||||
* \param scalefactor Pointer to an INT, which contains the current scale of the input data,
|
||||
* which is updated according to the FFT scale.
|
||||
* \param pInput Input/Output data buffer. The input data must have at least 1
|
||||
* bit scale headroom. The values are interleaved, real/imag pairs.
|
||||
* \param scalefactor Pointer to an INT, which contains the current scale of the
|
||||
* input data, which is updated according to the FFT scale.
|
||||
*/
|
||||
void fft(int length, FIXP_DBL *pInput, INT *scalefactor);
|
||||
|
||||
@@ -108,146 +120,144 @@ void fft(int length, FIXP_DBL *pInput, INT *scalefactor);
|
||||
* \brief Perform an inplace complex valued IFFT of length 2^n
|
||||
*
|
||||
* \param length Length of the FFT to be calculated.
|
||||
* \param pInput Input/Output data buffer. The input data must have at least 1 bit scale headroom.
|
||||
* The values are interleaved, real/imag pairs.
|
||||
* \param scalefactor Pointer to an INT, which contains the current scale of the input data,
|
||||
* which is updated according to the IFFT scale.
|
||||
* \param pInput Input/Output data buffer. The input data must have at least 1
|
||||
* bit scale headroom. The values are interleaved, real/imag pairs.
|
||||
* \param scalefactor Pointer to an INT, which contains the current scale of the
|
||||
* input data, which is updated according to the IFFT scale.
|
||||
*/
|
||||
void ifft(int length, FIXP_DBL *pInput, INT *scalefactor);
|
||||
|
||||
|
||||
/*
|
||||
* Frequently used and fixed short length FFTs.
|
||||
*/
|
||||
|
||||
LNK_SECTION_CODE_L1
|
||||
static FORCEINLINE void fft_4(FIXP_DBL *x)
|
||||
{
|
||||
FIXP_DBL a00, a10, a20, a30, tmp0, tmp1;
|
||||
|
||||
a00 = (x[0] + x[4])>>1; /* Re A + Re B */
|
||||
a10 = (x[2] + x[6])>>1; /* Re C + Re D */
|
||||
a20 = (x[1] + x[5])>>1; /* Im A + Im B */
|
||||
a30 = (x[3] + x[7])>>1; /* Im C + Im D */
|
||||
|
||||
x[0] = a00 + a10; /* Re A' = Re A + Re B + Re C + Re D */
|
||||
x[1] = a20 + a30; /* Im A' = Im A + Im B + Im C + Im D */
|
||||
|
||||
tmp0 = a00 - x[4]; /* Re A - Re B */
|
||||
tmp1 = a20 - x[5]; /* Im A - Im B */
|
||||
|
||||
x[4] = a00 - a10; /* Re C' = Re A + Re B - Re C - Re D */
|
||||
x[5] = a20 - a30; /* Im C' = Im A + Im B - Im C - Im D */
|
||||
|
||||
a10 = a10 - x[6]; /* Re C - Re D */
|
||||
a30 = a30 - x[7]; /* Im C - Im D */
|
||||
|
||||
x[2] = tmp0 + a30; /* Re B' = Re A - Re B + Im C - Im D */
|
||||
x[6] = tmp0 - a30; /* Re D' = Re A - Re B - Im C + Im D */
|
||||
x[3] = tmp1 - a10; /* Im B' = Im A - Im B - Re C + Re D */
|
||||
x[7] = tmp1 + a10; /* Im D' = Im A - Im B + Re C - Re D */
|
||||
}
|
||||
|
||||
LNK_SECTION_CODE_L1
|
||||
static FORCEINLINE void fft_8(FIXP_DBL *x)
|
||||
{
|
||||
#define W_PiFOURTH STC(0x5a82799a)
|
||||
|
||||
FIXP_DBL a00, a10, a20, a30;
|
||||
FIXP_DBL y[16];
|
||||
|
||||
a00 = (x[0] + x[8])>>1;
|
||||
a10 = x[4] + x[12];
|
||||
a20 = (x[1] + x[9])>>1;
|
||||
a30 = x[5] + x[13];
|
||||
|
||||
y[0] = a00 + (a10>>1);
|
||||
y[4] = a00 - (a10>>1);
|
||||
y[1] = a20 + (a30>>1);
|
||||
y[5] = a20 - (a30>>1);
|
||||
|
||||
a00 = a00 - x[8];
|
||||
a10 = (a10>>1) - x[12];
|
||||
a20 = a20 - x[9];
|
||||
a30 = (a30>>1) - x[13];
|
||||
|
||||
y[2] = a00 + a30;
|
||||
y[6] = a00 - a30;
|
||||
y[3] = a20 - a10;
|
||||
y[7] = a20 + a10;
|
||||
|
||||
a00 = (x[2] + x[10])>>1;
|
||||
a10 = x[6] + x[14];
|
||||
a20 = (x[3] + x[11])>>1;
|
||||
a30 = x[7] + x[15];
|
||||
|
||||
y[8] = a00 + (a10>>1);
|
||||
y[12] = a00 - (a10>>1);
|
||||
y[9] = a20 + (a30>>1);
|
||||
y[13] = a20 - (a30>>1);
|
||||
|
||||
a00 = a00 - x[10];
|
||||
a10 = (a10>>1) - x[14];
|
||||
a20 = a20 - x[11];
|
||||
a30 = (a30>>1) - x[15];
|
||||
|
||||
y[10] = a00 + a30;
|
||||
y[14] = a00 - a30;
|
||||
y[11] = a20 - a10;
|
||||
y[15] = a20 + a10;
|
||||
|
||||
FIXP_DBL vr, vi, ur, ui;
|
||||
|
||||
ur = y[0]>>1;
|
||||
ui = y[1]>>1;
|
||||
vr = y[8];
|
||||
vi = y[9];
|
||||
x[0] = ur + (vr>>1);
|
||||
x[1] = ui + (vi>>1);
|
||||
x[8] = ur - (vr>>1);
|
||||
x[9] = ui - (vi>>1);
|
||||
|
||||
ur = y[4]>>1;
|
||||
ui = y[5]>>1;
|
||||
vi = y[12];
|
||||
vr = y[13];
|
||||
x[4] = ur + (vr>>1);
|
||||
x[5] = ui - (vi>>1);
|
||||
x[12] = ur - (vr>>1);
|
||||
x[13] = ui + (vi>>1);
|
||||
|
||||
ur = y[10];
|
||||
ui = y[11];
|
||||
vr = fMultDiv2(ui+ur,W_PiFOURTH);
|
||||
vi = fMultDiv2(ui-ur,W_PiFOURTH);
|
||||
ur = y[2];
|
||||
ui = y[3];
|
||||
x[2] = (ur>>1) + vr;
|
||||
x[3] = (ui>>1) + vi;
|
||||
x[10] = (ur>>1) - vr;
|
||||
x[11] = (ui>>1) - vi;
|
||||
|
||||
ur = y[14];
|
||||
ui = y[15];
|
||||
vr = fMultDiv2(ui-ur,W_PiFOURTH);
|
||||
vi = fMultDiv2(ui+ur,W_PiFOURTH);
|
||||
ur = y[6];
|
||||
ui = y[7];
|
||||
x[6] = (ur>>1) + vr;
|
||||
x[7] = (ui>>1) - vi;
|
||||
x[14] = (ur>>1) - vr;
|
||||
x[15] = (ui>>1) + vi;
|
||||
}
|
||||
|
||||
#ifndef FUNCTION_fft_4
|
||||
/**
|
||||
* \brief FFT of fixed length 16
|
||||
* \brief Perform an inplace complex valued FFT of length 4
|
||||
*
|
||||
* \param pInput Input/Output data buffer. The input data must have at least 1
|
||||
* bit scale headroom. The values are interleaved, real/imag pairs.
|
||||
*/
|
||||
inline void fft_16(FIXP_DBL *x);
|
||||
LNK_SECTION_CODE_L1
|
||||
static FDK_FORCEINLINE void fft_4(FIXP_DBL *x) {
|
||||
FIXP_DBL a00, a10, a20, a30, tmp0, tmp1;
|
||||
|
||||
/**
|
||||
* \brief FFT of fixed length 32
|
||||
*/
|
||||
inline void fft_32(FIXP_DBL *x);
|
||||
a00 = (x[0] + x[4]) >> 1; /* Re A + Re B */
|
||||
a10 = (x[2] + x[6]) >> 1; /* Re C + Re D */
|
||||
a20 = (x[1] + x[5]) >> 1; /* Im A + Im B */
|
||||
a30 = (x[3] + x[7]) >> 1; /* Im C + Im D */
|
||||
|
||||
x[0] = a00 + a10; /* Re A' = Re A + Re B + Re C + Re D */
|
||||
x[1] = a20 + a30; /* Im A' = Im A + Im B + Im C + Im D */
|
||||
|
||||
tmp0 = a00 - x[4]; /* Re A - Re B */
|
||||
tmp1 = a20 - x[5]; /* Im A - Im B */
|
||||
|
||||
x[4] = a00 - a10; /* Re C' = Re A + Re B - Re C - Re D */
|
||||
x[5] = a20 - a30; /* Im C' = Im A + Im B - Im C - Im D */
|
||||
|
||||
a10 = a10 - x[6]; /* Re C - Re D */
|
||||
a30 = a30 - x[7]; /* Im C - Im D */
|
||||
|
||||
x[2] = tmp0 + a30; /* Re B' = Re A - Re B + Im C - Im D */
|
||||
x[6] = tmp0 - a30; /* Re D' = Re A - Re B - Im C + Im D */
|
||||
x[3] = tmp1 - a10; /* Im B' = Im A - Im B - Re C + Re D */
|
||||
x[7] = tmp1 + a10; /* Im D' = Im A - Im B + Re C - Re D */
|
||||
}
|
||||
#endif /* FUNCTION_fft_4 */
|
||||
|
||||
#ifndef FUNCTION_fft_8
|
||||
LNK_SECTION_CODE_L1
|
||||
static FDK_FORCEINLINE void fft_8(FIXP_DBL *x) {
|
||||
FIXP_SPK w_PiFOURTH = {{FIXP_SGL(0x5A82), FIXP_SGL(0x5A82)}};
|
||||
|
||||
FIXP_DBL a00, a10, a20, a30;
|
||||
FIXP_DBL y[16];
|
||||
|
||||
a00 = (x[0] + x[8]) >> 1;
|
||||
a10 = x[4] + x[12];
|
||||
a20 = (x[1] + x[9]) >> 1;
|
||||
a30 = x[5] + x[13];
|
||||
|
||||
y[0] = a00 + (a10 >> 1);
|
||||
y[4] = a00 - (a10 >> 1);
|
||||
y[1] = a20 + (a30 >> 1);
|
||||
y[5] = a20 - (a30 >> 1);
|
||||
|
||||
a00 = a00 - x[8];
|
||||
a10 = (a10 >> 1) - x[12];
|
||||
a20 = a20 - x[9];
|
||||
a30 = (a30 >> 1) - x[13];
|
||||
|
||||
y[2] = a00 + a30;
|
||||
y[6] = a00 - a30;
|
||||
y[3] = a20 - a10;
|
||||
y[7] = a20 + a10;
|
||||
|
||||
a00 = (x[2] + x[10]) >> 1;
|
||||
a10 = x[6] + x[14];
|
||||
a20 = (x[3] + x[11]) >> 1;
|
||||
a30 = x[7] + x[15];
|
||||
|
||||
y[8] = a00 + (a10 >> 1);
|
||||
y[12] = a00 - (a10 >> 1);
|
||||
y[9] = a20 + (a30 >> 1);
|
||||
y[13] = a20 - (a30 >> 1);
|
||||
|
||||
a00 = a00 - x[10];
|
||||
a10 = (a10 >> 1) - x[14];
|
||||
a20 = a20 - x[11];
|
||||
a30 = (a30 >> 1) - x[15];
|
||||
|
||||
y[10] = a00 + a30;
|
||||
y[14] = a00 - a30;
|
||||
y[11] = a20 - a10;
|
||||
y[15] = a20 + a10;
|
||||
|
||||
FIXP_DBL vr, vi, ur, ui;
|
||||
|
||||
ur = y[0] >> 1;
|
||||
ui = y[1] >> 1;
|
||||
vr = y[8];
|
||||
vi = y[9];
|
||||
x[0] = ur + (vr >> 1);
|
||||
x[1] = ui + (vi >> 1);
|
||||
x[8] = ur - (vr >> 1);
|
||||
x[9] = ui - (vi >> 1);
|
||||
|
||||
ur = y[4] >> 1;
|
||||
ui = y[5] >> 1;
|
||||
vi = y[12];
|
||||
vr = y[13];
|
||||
x[4] = ur + (vr >> 1);
|
||||
x[5] = ui - (vi >> 1);
|
||||
x[12] = ur - (vr >> 1);
|
||||
x[13] = ui + (vi >> 1);
|
||||
|
||||
ur = y[10];
|
||||
ui = y[11];
|
||||
|
||||
cplxMultDiv2(&vi, &vr, ui, ur, w_PiFOURTH);
|
||||
|
||||
ur = y[2];
|
||||
ui = y[3];
|
||||
x[2] = (ur >> 1) + vr;
|
||||
x[3] = (ui >> 1) + vi;
|
||||
x[10] = (ur >> 1) - vr;
|
||||
x[11] = (ui >> 1) - vi;
|
||||
|
||||
ur = y[14];
|
||||
ui = y[15];
|
||||
|
||||
cplxMultDiv2(&vr, &vi, ui, ur, w_PiFOURTH);
|
||||
|
||||
ur = y[6];
|
||||
ui = y[7];
|
||||
x[6] = (ur >> 1) + vr;
|
||||
x[7] = (ui >> 1) - vi;
|
||||
x[14] = (ur >> 1) - vr;
|
||||
x[15] = (ui >> 1) + vi;
|
||||
}
|
||||
#endif /* FUNCTION_fft_8 */
|
||||
|
||||
#endif
|
||||
|
||||
Reference in New Issue
Block a user