1
2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5 � Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
6 All rights reserved.
7
8 1. INTRODUCTION
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.
12
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.
17
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.
24
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.
28
29 2. COPYRIGHT LICENSE
30
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:
33
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.
36
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.
41
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
44
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.
47
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."
52
53 3. NO PATENT LICENSE
54
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.
58
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
61
62 4. DISCLAIMER
63
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.
72
73 5. CONTACT INFORMATION
74
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
77 Am Wolfsmantel 33
78 91058 Erlangen, Germany
79
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
83
84 /******************************** Fraunhofer IIS ***************************
85
86 Author(s): Arthur Tritthart
87 Description: (ARM optimised) SBR domain coding
88
89 ******************************************************************************/
90 #ifndef INCLUSION_GUARD_CALC_ENV_ARM
91 #define INCLUSION_GUARD_CALC_ENV_ARM
92
93
94 /*!
95 \brief Compute maximal value of a complex array (re/im) of a given width
96 Negative values are temporarily logically or'ed with 0xFFFFFFFF
97 instead of negating the value, if the sign bit is set.
98 \param maxVal Preset maximal value
99 \param reTmp real input signal
100 \param imTmp imaginary input signal
101 \return new maximal value
102 */
103
104 #ifdef FUNCTION_FDK_get_maxval
FDK_get_maxval(FIXP_DBL maxVal,FIXP_DBL * reTmp,FIXP_DBL * imTmp,int width)105 __asm FIXP_DBL FDK_get_maxval (FIXP_DBL maxVal, FIXP_DBL *reTmp, FIXP_DBL *imTmp, int width )
106 {
107
108 /* Register map:
109 r0 maxVal
110 r1 reTmp
111 r2 imTmp
112 r3 width
113 r4 real
114 r5 imag
115 */
116 PUSH {r4-r5}
117
118 MOVS r3, r3, ASR #1
119 ADC r3, r3, #0
120 BCS FDK_get_maxval_loop_2nd_part
121 BEQ FDK_get_maxval_loop_end
122
123 FDK_get_maxval_loop
124 LDR r4, [r1], #4
125 LDR r5, [r2], #4
126 EOR r4, r4, r4, ASR #31
127 EOR r5, r5, r5, ASR #31
128 ORR r0, r0, r4
129 ORR r0, r0, r5
130
131 FDK_get_maxval_loop_2nd_part
132 LDR r4, [r1], #4
133 LDR r5, [r2], #4
134 EOR r4, r4, r4, ASR #31
135 EOR r5, r5, r5, ASR #31
136 ORR r0, r0, r4
137 ORR r0, r0, r5
138
139 SUBS r3, r3, #1
140 BNE FDK_get_maxval_loop
141
142 FDK_get_maxval_loop_end
143 POP {r4-r5}
144 BX lr
145 }
146 #endif /* FUNCTION_FDK_get_maxval */
147
148 #endif /* INCLUSION_GUARD_CALC_ENV_ARM */
149