2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
5 © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16 of the MPEG specifications.
18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27 applications information and documentation.
31 Redistribution and use in source and binary forms, with or without modification, are permitted without
32 payment of copyright license fees provided that you satisfy the following conditions:
34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35 your modifications thereto in source code form.
37 You must retain the complete text of this software license in the documentation and/or other materials
38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40 modifications thereto to recipients of copies in binary form.
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46 software or your modifications thereto.
48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49 and the date of any change. For modified versions of the FDK AAC Codec, the term
50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57 respect to this software.
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69 or business interruption, however caused and on any theory of liability, whether in contract, strict
70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
71 advised of the possibility of such damage.
73 5. CONTACT INFORMATION
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
78 91058 Erlangen, Germany
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
84 /*************************** Fraunhofer IIS FDK Tools **********************
86 Author(s): M. Lohwasser, M. Gayer
89 ******************************************************************************/
95 #define __FFT_RAD2_CPP__
97 #if defined(__arm__) /* cppp replaced: elif */
98 #include "arm/fft_rad2_arm.cpp"
100 #elif defined(__GNUC__) && defined(__mips__) && defined(__mips_dsp) /* cppp replaced: elif */
101 #include "mips/fft_rad2_mips.cpp"
107 /*****************************************************************************
109 functionname: dit_fft (analysis)
110 description: dit-tukey-algorithm
111 scrambles data at entry
112 i.e. loop is made with scrambled data
117 *****************************************************************************/
119 #ifndef FUNCTION_dit_fft
121 void dit_fft(FIXP_DBL
*x
, const INT ldn
, const FIXP_STP
*trigdata
, const INT trigDataSize
)
133 FIXP_DBL a00
, a10
, a20
, a30
;
134 a00
= (x
[i
+ 0] + x
[i
+ 2])>>1; /* Re A + Re B */
135 a10
= (x
[i
+ 4] + x
[i
+ 6])>>1; /* Re C + Re D */
136 a20
= (x
[i
+ 1] + x
[i
+ 3])>>1; /* Im A + Im B */
137 a30
= (x
[i
+ 5] + x
[i
+ 7])>>1; /* Im C + Im D */
139 x
[i
+ 0] = a00
+ a10
; /* Re A' = Re A + Re B + Re C + Re D */
140 x
[i
+ 4] = a00
- a10
; /* Re C' = Re A + Re B - Re C - Re D */
141 x
[i
+ 1] = a20
+ a30
; /* Im A' = Im A + Im B + Im C + Im D */
142 x
[i
+ 5] = a20
- a30
; /* Im C' = Im A + Im B - Im C - Im D */
144 a00
= a00
- x
[i
+ 2]; /* Re A - Re B */
145 a10
= a10
- x
[i
+ 6]; /* Re C - Re D */
146 a20
= a20
- x
[i
+ 3]; /* Im A - Im B */
147 a30
= a30
- x
[i
+ 7]; /* Im C - Im D */
149 x
[i
+ 2] = a00
+ a30
; /* Re B' = Re A - Re B + Im C - Im D */
150 x
[i
+ 6] = a00
- a30
; /* Re D' = Re A - Re B - Im C + Im D */
151 x
[i
+ 3] = a20
- a10
; /* Im B' = Im A - Im B - Re C + Re D */
152 x
[i
+ 7] = a20
+ a10
; /* Im D' = Im A - Im B + Re C - Re D */
155 for(ldm
=3; ldm
<=ldn
; ++ldm
)
161 trigstep
=((trigDataSize
<< 2)>>ldm
);
163 FDK_ASSERT(trigstep
> 0);
165 /* Do first iteration with c=1.0 and s=0.0 separately to avoid loosing to much precision.
166 Beware: The impact on the overal FFT precision is rather large. */
173 INT t2
= t1
+ (mh
<<1);
174 FIXP_DBL vr
,vi
,ur
,ui
;
176 //cplxMultDiv2(&vi, &vr, x[t2+1], x[t2], (FIXP_SGL)1.0, (FIXP_SGL)0.0);
192 //cplxMultDiv2(&vr, &vi, x[t2+1], x[t2], (FIXP_SGL)1.0, (FIXP_SGL)0.0);
206 for(j
=1; j
<mh
/4; ++j
)
210 cs
= trigdata
[j
*trigstep
];
215 INT t2
= t1
+ (mh
<<1);
216 FIXP_DBL vr
,vi
,ur
,ui
;
218 cplxMultDiv2(&vi
, &vr
, x
[t2
+1], x
[t2
], cs
);
232 cplxMultDiv2(&vr
, &vi
, x
[t2
+1], x
[t2
], cs
);
243 /* Same as above but for t1,t2 with j>mh/4 and thus cs swapped */
247 cplxMultDiv2(&vi
, &vr
, x
[t2
], x
[t2
+1], cs
);
261 cplxMultDiv2(&vr
, &vi
, x
[t2
], x
[t2
+1], cs
);
279 INT t2
= t1
+ (mh
<<1);
280 FIXP_DBL vr
,vi
,ur
,ui
;
282 cplxMultDiv2(&vi
, &vr
, x
[t2
+1], x
[t2
], STC(0x5a82799a), STC(0x5a82799a));
296 cplxMultDiv2(&vr
, &vi
, x
[t2
+1], x
[t2
], STC(0x5a82799a), STC(0x5a82799a));
313 /*****************************************************************************
315 functionname: dit_ifft (synthesis)
316 description: dit-tukey-algorithm
317 scrambles data at entry
318 i.e. loop is made with scrambled data
323 *****************************************************************************/
325 #if !defined(FUNCTION_dit_ifft)
326 void dit_ifft(FIXP_DBL
*x
, const INT ldn
, const FIXP_STP
*trigdata
, const INT trigDataSize
)
339 FIXP_DBL a0
, a1
, a2
, a3
, a00
, a10
, a20
, a30
;
341 a00
= (x
[i
+ 0] + x
[i
+ 2])>>1; /* Re A + Re B */
342 a10
= (x
[i
+ 4] + x
[i
+ 6])>>1; /* Re C + Re D */
343 a20
= (x
[i
+ 1] + x
[i
+ 3])>>1; /* Im A + Im B */
344 a30
= (x
[i
+ 5] + x
[i
+ 7])>>1; /* Im C + Im D */
345 a0
= (x
[i
+ 0] - x
[i
+ 2])>>1; /* Re A - Re B */
346 a2
= (x
[i
+ 4] - x
[i
+ 6])>>1; /* Re C - Re D */
347 a3
= (x
[i
+ 1] - x
[i
+ 3])>>1; /* Im A - Im B */
348 a1
= (x
[i
+ 5] - x
[i
+ 7])>>1; /* Im C - Im D */
350 x
[i
+ 0] = a00
+ a10
; /* Re A' = Re A + Re B + Re C + Re D */
351 x
[i
+ 4] = a00
- a10
; /* Re C' = Re A + Re B - Re C - Re D */
352 x
[i
+ 1] = a20
+ a30
; /* Im A' = Im A + Im B + Im C + Im D */
353 x
[i
+ 5] = a20
- a30
; /* Im C' = Im A + Im B - Im C - Im D */
354 x
[i
+ 2] = a0
- a1
; /* Re B' = Re A - Re B - Im C + Im D */
355 x
[i
+ 6] = a0
+ a1
; /* Re D' = Re A - Re B + Im C - Im D */
356 x
[i
+ 3] = a3
+ a2
; /* Im B' = Im A - Im B + Re C - Re D */
357 x
[i
+ 7] = a3
- a2
; /* Im D' = Im A - Im B - Re C + Re D */
360 for(ldm
=3; ldm
<=ldn
; ++ldm
)
362 const INT m
=(1<<ldm
);
367 trigstep
=((trigDataSize
<< 2)>>ldm
);
375 INT t2
= t1
+ (mh
<<1);
376 FIXP_DBL vr
,vi
,ur
,ui
;
378 //cplxMultDiv2(&vr, &vi, x[t2], x[t2+1], FL2FXCONST_SGL(1.0), (FIXP_SGL)0.0);
394 //cplxMultDiv2(&vi, &vr, x[t2], x[t2+1], FL2FXCONST_SGL(1.0), FL2FXCONST_SGL(0.0));
408 for(j
=1; j
<mh
/4; ++j
)
412 cs
= trigdata
[j
*trigstep
];
417 INT t2
= t1
+ (mh
<<1);
418 FIXP_DBL vr
,vi
,ur
,ui
;
420 cplxMultDiv2(&vr
, &vi
, x
[t2
], x
[t2
+1], cs
);
434 cplxMultDiv2(&vi
, &vr
, x
[t2
], x
[t2
+1], cs
);
445 /* Same as above but for t1,t2 with j>mh/4 and thus cs swapped */
449 cplxMultDiv2(&vr
, &vi
, x
[t2
+1], x
[t2
], cs
);
463 cplxMultDiv2(&vi
, &vr
, x
[t2
+1], x
[t2
], cs
);
479 INT t1
= (r
+mh
/2-j
)<<1;
480 INT t2
= t1
+ (mh
<<1);
481 FIXP_DBL vr
,vi
,ur
,ui
;
483 cplxMultDiv2(&vr
, &vi
, x
[t2
], x
[t2
+1], STC(0x5a82799a), STC(0x5a82799a));
497 cplxMultDiv2(&vi
, &vr
, x
[t2
], x
[t2
+1], STC(0x5a82799a), STC(0x5a82799a));