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 /**************************** AAC encoder library ******************************
96
97 Author(s): Tobias Chalupka
98
99 Description: FDKaacLdEnc_MdctTransform480:
100 The module FDKaacLdEnc_MdctTransform will perform the MDCT.
101 The MDCT supports the sine window and
102 the zero padded window. The algorithm of the MDCT
103 can be divided in Windowing, PreModulation, Fft and
104 PostModulation.
105
106 *******************************************************************************/
107
108 #include "transform.h"
109 #include "dct.h"
110 #include "psy_const.h"
111 #include "aacEnc_rom.h"
112 #include "FDK_tools_rom.h"
113
114 #if defined(__arm__)
115 #endif
116
FDKaacEnc_Transform_Real(const INT_PCM * pTimeData,FIXP_DBL * RESTRICT mdctData,const INT blockType,const INT windowShape,INT * prevWindowShape,H_MDCT mdctPers,const INT frameLength,INT * pMdctData_e,INT filterType)117 INT FDKaacEnc_Transform_Real(const INT_PCM *pTimeData,
118 FIXP_DBL *RESTRICT mdctData, const INT blockType,
119 const INT windowShape, INT *prevWindowShape,
120 H_MDCT mdctPers, const INT frameLength,
121 INT *pMdctData_e, INT filterType) {
122 const INT_PCM *RESTRICT timeData;
123
124 UINT numSpec;
125 UINT numMdctLines;
126 UINT offset;
127 int fr; /* fr: right window slope length */
128 SHORT mdctData_e[8];
129
130 timeData = pTimeData;
131
132 if (blockType == SHORT_WINDOW) {
133 numSpec = 8;
134 numMdctLines = frameLength >> 3;
135 } else {
136 numSpec = 1;
137 numMdctLines = frameLength;
138 }
139
140 offset = (windowShape == LOL_WINDOW) ? ((frameLength * 3) >> 2) : 0;
141 switch (blockType) {
142 case LONG_WINDOW:
143 case STOP_WINDOW:
144 fr = frameLength - offset;
145 break;
146 case START_WINDOW: /* or StopStartSequence */
147 case SHORT_WINDOW:
148 fr = frameLength >> 3;
149 break;
150 default:
151 FDK_ASSERT(0);
152 return -1;
153 }
154
155 mdct_block(mdctPers, timeData, frameLength, mdctData, numSpec, numMdctLines,
156 FDKgetWindowSlope(fr, windowShape), fr, mdctData_e);
157
158 if (blockType == SHORT_WINDOW) {
159 if (!(mdctData_e[0] == mdctData_e[1] && mdctData_e[1] == mdctData_e[2] &&
160 mdctData_e[2] == mdctData_e[3] && mdctData_e[3] == mdctData_e[4] &&
161 mdctData_e[4] == mdctData_e[5] && mdctData_e[5] == mdctData_e[6] &&
162 mdctData_e[6] == mdctData_e[7])) {
163 return -1;
164 }
165 }
166 *prevWindowShape = windowShape;
167 *pMdctData_e = mdctData_e[0];
168
169 return 0;
170 }
171
FDKaacEnc_Transform_Real_Eld(const INT_PCM * pTimeData,FIXP_DBL * RESTRICT mdctData,const INT blockType,const INT windowShape,INT * prevWindowShape,const INT frameLength,INT * mdctData_e,INT filterType,FIXP_DBL * RESTRICT overlapAddBuffer)172 INT FDKaacEnc_Transform_Real_Eld(const INT_PCM *pTimeData,
173 FIXP_DBL *RESTRICT mdctData,
174 const INT blockType, const INT windowShape,
175 INT *prevWindowShape, const INT frameLength,
176 INT *mdctData_e, INT filterType,
177 FIXP_DBL *RESTRICT overlapAddBuffer) {
178 const INT_PCM *RESTRICT timeData;
179
180 INT i;
181
182 /* tl: transform length
183 fl: left window slope length
184 nl: left window slope offset
185 fr: right window slope length
186 nr: right window slope offset */
187 const FIXP_WTB *pWindowELD = NULL;
188 int N = frameLength;
189 int L = frameLength;
190
191 timeData = pTimeData;
192
193 if (blockType != LONG_WINDOW) {
194 return -1;
195 }
196
197 /*
198 * MDCT scale:
199 * + 1: fMultDiv2() in windowing.
200 * + 1: Because of factor 1/2 in Princen-Bradley compliant windowed TDAC.
201 */
202 *mdctData_e = 1 + 1;
203
204 switch (frameLength) {
205 case 512:
206 pWindowELD = ELDAnalysis512;
207 break;
208 case 480:
209 pWindowELD = ELDAnalysis480;
210 break;
211 case 256:
212 pWindowELD = ELDAnalysis256;
213 *mdctData_e += 1;
214 break;
215 case 240:
216 pWindowELD = ELDAnalysis240;
217 *mdctData_e += 1;
218 break;
219 case 128:
220 pWindowELD = ELDAnalysis128;
221 *mdctData_e += 2;
222 break;
223 case 120:
224 pWindowELD = ELDAnalysis120;
225 *mdctData_e += 2;
226 break;
227 default:
228 FDK_ASSERT(0);
229 return -1;
230 }
231
232 for (i = 0; i < N / 4; i++) {
233 FIXP_DBL z0, outval;
234
235 z0 = (fMult((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i],
236 pWindowELD[N / 2 - 1 - i])
237 << (WTS0 - 1)) +
238 (fMult((FIXP_PCM)timeData[L + N * 3 / 4 + i], pWindowELD[N / 2 + i])
239 << (WTS0 - 1));
240
241 outval = (fMultDiv2((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i],
242 pWindowELD[N + N / 2 - 1 - i]) >>
243 (-WTS1));
244 outval += (fMultDiv2((FIXP_PCM)timeData[L + N * 3 / 4 + i],
245 pWindowELD[N + N / 2 + i]) >>
246 (-WTS1));
247 outval += (fMultDiv2(overlapAddBuffer[N / 2 + i], pWindowELD[2 * N + i]) >>
248 (-WTS2 - 1));
249
250 overlapAddBuffer[N / 2 + i] = overlapAddBuffer[i];
251
252 overlapAddBuffer[i] = z0;
253 mdctData[i] = overlapAddBuffer[N / 2 + i] +
254 (fMultDiv2(overlapAddBuffer[N + N / 2 - 1 - i],
255 pWindowELD[2 * N + N / 2 + i]) >>
256 (-WTS2 - 1));
257
258 mdctData[N - 1 - i] = outval;
259 overlapAddBuffer[N + N / 2 - 1 - i] = outval;
260 }
261
262 for (i = N / 4; i < N / 2; i++) {
263 FIXP_DBL z0, outval;
264
265 z0 = fMult((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i],
266 pWindowELD[N / 2 - 1 - i])
267 << (WTS0 - 1);
268
269 outval = (fMultDiv2((FIXP_PCM)timeData[L + N * 3 / 4 - 1 - i],
270 pWindowELD[N + N / 2 - 1 - i]) >>
271 (-WTS1));
272 outval += (fMultDiv2(overlapAddBuffer[N / 2 + i], pWindowELD[2 * N + i]) >>
273 (-WTS2 - 1));
274
275 overlapAddBuffer[N / 2 + i] =
276 overlapAddBuffer[i] +
277 (fMult((FIXP_PCM)timeData[L - N / 4 + i], pWindowELD[N / 2 + i])
278 << (WTS0 - 1));
279
280 overlapAddBuffer[i] = z0;
281 mdctData[i] = overlapAddBuffer[N / 2 + i] +
282 (fMultDiv2(overlapAddBuffer[N + N / 2 - 1 - i],
283 pWindowELD[2 * N + N / 2 + i]) >>
284 (-WTS2 - 1));
285
286 mdctData[N - 1 - i] = outval;
287 overlapAddBuffer[N + N / 2 - 1 - i] = outval;
288 }
289 dct_IV(mdctData, frameLength, mdctData_e);
290
291 *prevWindowShape = windowShape;
292
293 return 0;
294 }
295