1
2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5 � Copyright 1995 - 2012 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 /*!
85 \file
86 \brief Sbr miscellaneous helper functions
87 */
88 #include "sbr_misc.h"
89
90
FDKsbrEnc_Shellsort_fract(FIXP_DBL * in,INT n)91 void FDKsbrEnc_Shellsort_fract (FIXP_DBL *in, INT n)
92 {
93 FIXP_DBL v;
94 INT i, j;
95 INT inc = 1;
96
97 do
98 inc = 3 * inc + 1;
99 while (inc <= n);
100
101 do {
102 inc = inc / 3;
103 for (i = inc + 1; i <= n; i++) {
104 v = in[i-1];
105 j = i;
106 while (in[j-inc-1] > v) {
107 in[j-1] = in[j-inc-1];
108 j -= inc;
109 if (j <= inc)
110 break;
111 }
112 in[j-1] = v;
113 }
114 } while (inc > 1);
115
116 }
117
118 /* Sorting routine */
FDKsbrEnc_Shellsort_int(INT * in,INT n)119 void FDKsbrEnc_Shellsort_int (INT *in, INT n)
120 {
121
122 INT i, j, v;
123 INT inc = 1;
124
125 do
126 inc = 3 * inc + 1;
127 while (inc <= n);
128
129 do {
130 inc = inc / 3;
131 for (i = inc + 1; i <= n; i++) {
132 v = in[i-1];
133 j = i;
134 while (in[j-inc-1] > v) {
135 in[j-1] = in[j-inc-1];
136 j -= inc;
137 if (j <= inc)
138 break;
139 }
140 in[j-1] = v;
141 }
142 } while (inc > 1);
143
144 }
145
146
147
148 /*******************************************************************************
149 Functionname: FDKsbrEnc_AddVecLeft
150 *******************************************************************************
151
152 Description:
153
154 Arguments: INT* dst, INT* length_dst, INT* src, INT length_src
155
156 Return: none
157
158 *******************************************************************************/
159 void
FDKsbrEnc_AddVecLeft(INT * dst,INT * length_dst,INT * src,INT length_src)160 FDKsbrEnc_AddVecLeft (INT *dst, INT *length_dst, INT *src, INT length_src)
161 {
162 INT i;
163
164 for (i = length_src - 1; i >= 0; i--)
165 FDKsbrEnc_AddLeft (dst, length_dst, src[i]);
166 }
167
168
169 /*******************************************************************************
170 Functionname: FDKsbrEnc_AddLeft
171 *******************************************************************************
172
173 Description:
174
175 Arguments: INT* vector, INT* length_vector, INT value
176
177 Return: none
178
179 *******************************************************************************/
180 void
FDKsbrEnc_AddLeft(INT * vector,INT * length_vector,INT value)181 FDKsbrEnc_AddLeft (INT *vector, INT *length_vector, INT value)
182 {
183 INT i;
184
185 for (i = *length_vector; i > 0; i--)
186 vector[i] = vector[i - 1];
187 vector[0] = value;
188 (*length_vector)++;
189 }
190
191
192 /*******************************************************************************
193 Functionname: FDKsbrEnc_AddRight
194 *******************************************************************************
195
196 Description:
197
198 Arguments: INT* vector, INT* length_vector, INT value
199
200 Return: none
201
202 *******************************************************************************/
203 void
FDKsbrEnc_AddRight(INT * vector,INT * length_vector,INT value)204 FDKsbrEnc_AddRight (INT *vector, INT *length_vector, INT value)
205 {
206 vector[*length_vector] = value;
207 (*length_vector)++;
208 }
209
210
211
212 /*******************************************************************************
213 Functionname: FDKsbrEnc_AddVecRight
214 *******************************************************************************
215
216 Description:
217
218 Arguments: INT* dst, INT* length_dst, INT* src, INT length_src)
219
220 Return: none
221
222 *******************************************************************************/
223 void
FDKsbrEnc_AddVecRight(INT * dst,INT * length_dst,INT * src,INT length_src)224 FDKsbrEnc_AddVecRight (INT *dst, INT *length_dst, INT *src, INT length_src)
225 {
226 INT i;
227 for (i = 0; i < length_src; i++)
228 FDKsbrEnc_AddRight (dst, length_dst, src[i]);
229 }
230
231
232 /*****************************************************************************
233
234 functionname: FDKsbrEnc_LSI_divide_scale_fract
235
236 description: Calculates division with best precision and scales the result.
237
238 return: num*scale/denom
239
240 *****************************************************************************/
FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num,FIXP_DBL denom,FIXP_DBL scale)241 FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom, FIXP_DBL scale)
242 {
243 FIXP_DBL tmp = FL2FXCONST_DBL(0.0f);
244 if (num != FL2FXCONST_DBL(0.0f)) {
245
246 INT shiftCommon;
247 INT shiftNum = CountLeadingBits(num);
248 INT shiftDenom = CountLeadingBits(denom);
249 INT shiftScale = CountLeadingBits(scale);
250
251 num = num << shiftNum;
252 scale = scale << shiftScale;
253
254 tmp = fMultDiv2(num,scale);
255
256 if ( denom > (tmp >> fixMin(shiftNum+shiftScale-1,(DFRACT_BITS-1))) ) {
257 denom = denom << shiftDenom;
258 tmp = schur_div(tmp,denom,15);
259 shiftCommon = fixMin((shiftNum-shiftDenom+shiftScale-1),(DFRACT_BITS-1));
260 if (shiftCommon < 0)
261 tmp <<= -shiftCommon;
262 else
263 tmp >>= shiftCommon;
264 }
265 else {
266 tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL;
267 }
268 }
269
270 return (tmp);
271 }
272
273