1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3
4 © Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6
7 1. INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33
34 2. COPYRIGHT LICENSE
35
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60
61 3. NO PATENT LICENSE
62
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70
71 4. DISCLAIMER
72
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83
84 5. CONTACT INFORMATION
85
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94
95 /**************************** SBR encoder library ******************************
96
97 Author(s):
98
99 Description:
100
101 *******************************************************************************/
102
103 /*!
104 \file
105 \brief Sbr miscellaneous helper functions $Revision: 36750 $
106 */
107 #include "sbr_misc.h"
108
FDKsbrEnc_Shellsort_fract(FIXP_DBL * in,INT n)109 void FDKsbrEnc_Shellsort_fract(FIXP_DBL *in, INT n) {
110 FIXP_DBL v;
111 INT i, j;
112 INT inc = 1;
113
114 do
115 inc = 3 * inc + 1;
116 while (inc <= n);
117
118 do {
119 inc = inc / 3;
120 for (i = inc + 1; i <= n; i++) {
121 v = in[i - 1];
122 j = i;
123 while (in[j - inc - 1] > v) {
124 in[j - 1] = in[j - inc - 1];
125 j -= inc;
126 if (j <= inc) break;
127 }
128 in[j - 1] = v;
129 }
130 } while (inc > 1);
131 }
132
133 /* Sorting routine */
FDKsbrEnc_Shellsort_int(INT * in,INT n)134 void FDKsbrEnc_Shellsort_int(INT *in, INT n) {
135 INT i, j, v;
136 INT inc = 1;
137
138 do
139 inc = 3 * inc + 1;
140 while (inc <= n);
141
142 do {
143 inc = inc / 3;
144 for (i = inc + 1; i <= n; i++) {
145 v = in[i - 1];
146 j = i;
147 while (in[j - inc - 1] > v) {
148 in[j - 1] = in[j - inc - 1];
149 j -= inc;
150 if (j <= inc) break;
151 }
152 in[j - 1] = v;
153 }
154 } while (inc > 1);
155 }
156
157 /*******************************************************************************
158 Functionname: FDKsbrEnc_AddVecLeft
159 *******************************************************************************
160
161 Description:
162
163 Arguments: INT* dst, INT* length_dst, INT* src, INT length_src
164
165 Return: none
166
167 *******************************************************************************/
FDKsbrEnc_AddVecLeft(INT * dst,INT * length_dst,INT * src,INT length_src)168 void FDKsbrEnc_AddVecLeft(INT *dst, INT *length_dst, INT *src, INT length_src) {
169 INT i;
170
171 for (i = length_src - 1; i >= 0; i--)
172 FDKsbrEnc_AddLeft(dst, length_dst, src[i]);
173 }
174
175 /*******************************************************************************
176 Functionname: FDKsbrEnc_AddLeft
177 *******************************************************************************
178
179 Description:
180
181 Arguments: INT* vector, INT* length_vector, INT value
182
183 Return: none
184
185 *******************************************************************************/
FDKsbrEnc_AddLeft(INT * vector,INT * length_vector,INT value)186 void FDKsbrEnc_AddLeft(INT *vector, INT *length_vector, INT value) {
187 INT i;
188
189 for (i = *length_vector; i > 0; i--) vector[i] = vector[i - 1];
190 vector[0] = value;
191 (*length_vector)++;
192 }
193
194 /*******************************************************************************
195 Functionname: FDKsbrEnc_AddRight
196 *******************************************************************************
197
198 Description:
199
200 Arguments: INT* vector, INT* length_vector, INT value
201
202 Return: none
203
204 *******************************************************************************/
FDKsbrEnc_AddRight(INT * vector,INT * length_vector,INT value)205 void FDKsbrEnc_AddRight(INT *vector, INT *length_vector, INT value) {
206 vector[*length_vector] = value;
207 (*length_vector)++;
208 }
209
210 /*******************************************************************************
211 Functionname: FDKsbrEnc_AddVecRight
212 *******************************************************************************
213
214 Description:
215
216 Arguments: INT* dst, INT* length_dst, INT* src, INT length_src)
217
218 Return: none
219
220 *******************************************************************************/
FDKsbrEnc_AddVecRight(INT * dst,INT * length_dst,INT * src,INT length_src)221 void FDKsbrEnc_AddVecRight(INT *dst, INT *length_dst, INT *src,
222 INT length_src) {
223 INT i;
224 for (i = 0; i < length_src; i++) FDKsbrEnc_AddRight(dst, length_dst, src[i]);
225 }
226
227 /*****************************************************************************
228
229 functionname: FDKsbrEnc_LSI_divide_scale_fract
230
231 description: Calculates division with best precision and scales the result.
232
233 return: num*scale/denom
234
235 *****************************************************************************/
FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num,FIXP_DBL denom,FIXP_DBL scale)236 FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom,
237 FIXP_DBL scale) {
238 FIXP_DBL tmp = FL2FXCONST_DBL(0.0f);
239 if (num != FL2FXCONST_DBL(0.0f)) {
240 INT shiftCommon;
241 INT shiftNum = CountLeadingBits(num);
242 INT shiftDenom = CountLeadingBits(denom);
243 INT shiftScale = CountLeadingBits(scale);
244
245 num = num << shiftNum;
246 scale = scale << shiftScale;
247
248 tmp = fMultDiv2(num, scale);
249
250 if (denom > (tmp >> fixMin(shiftNum + shiftScale - 1, (DFRACT_BITS - 1)))) {
251 denom = denom << shiftDenom;
252 tmp = schur_div(tmp, denom, 15);
253 shiftCommon =
254 fixMin((shiftNum - shiftDenom + shiftScale - 1), (DFRACT_BITS - 1));
255 if (shiftCommon < 0)
256 tmp <<= -shiftCommon;
257 else
258 tmp >>= shiftCommon;
259 } else {
260 tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL;
261 }
262 }
263
264 return (tmp);
265 }
266