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 /***************************** MPEG-4 AAC Decoder **************************
85
86 Author(s): Josef Hoepfl
87 Description: individual channel stream info
88
89 ******************************************************************************/
90
91 #include "channelinfo.h"
92 #include "aac_rom.h"
93 #include "aac_ram.h"
94 #include "FDK_bitstream.h"
95
96
IcsReadMaxSfb(HANDLE_FDK_BITSTREAM bs,CIcsInfo * pIcsInfo,const SamplingRateInfo * pSamplingRateInfo)97 AAC_DECODER_ERROR IcsReadMaxSfb (
98 HANDLE_FDK_BITSTREAM bs,
99 CIcsInfo *pIcsInfo,
100 const SamplingRateInfo *pSamplingRateInfo
101 )
102 {
103 AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
104 int nbits;
105
106 if (IsLongBlock(pIcsInfo)) {
107 nbits = 6;
108 pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Long;
109 } else {
110 nbits = 4;
111 pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Short;
112 }
113 pIcsInfo->MaxSfBands = (UCHAR) FDKreadBits(bs, nbits);
114
115 if (pIcsInfo->MaxSfBands > pIcsInfo->TotalSfBands){
116 ErrorStatus = AAC_DEC_PARSE_ERROR;
117 }
118
119 return ErrorStatus;
120 }
121
122
123
IcsRead(HANDLE_FDK_BITSTREAM bs,CIcsInfo * pIcsInfo,const SamplingRateInfo * pSamplingRateInfo,const UINT flags)124 AAC_DECODER_ERROR IcsRead(HANDLE_FDK_BITSTREAM bs,
125 CIcsInfo *pIcsInfo,
126 const SamplingRateInfo* pSamplingRateInfo,
127 const UINT flags)
128 {
129 AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
130
131 pIcsInfo->Valid = 0;
132
133 if (flags & AC_ELD){
134 pIcsInfo->WindowSequence = OnlyLongSequence;
135 pIcsInfo->WindowShape = 0;
136 }
137 else {
138 if ( !(flags & (AC_USAC|AC_RSVD50)) ) {
139 FDKreadBits(bs,1);
140 }
141 pIcsInfo->WindowSequence = (UCHAR) FDKreadBits(bs,2);
142 pIcsInfo->WindowShape = (UCHAR) FDKreadBits(bs,1);
143 if (flags & AC_LD) {
144 if (pIcsInfo->WindowShape) {
145 pIcsInfo->WindowShape = 2; /* select low overlap instead of KBD */
146 }
147 }
148 }
149
150 /* Sanity check */
151 if ( (flags & (AC_ELD|AC_LD)) && pIcsInfo->WindowSequence != OnlyLongSequence) {
152 pIcsInfo->WindowSequence = OnlyLongSequence;
153 ErrorStatus = AAC_DEC_PARSE_ERROR;
154 goto bail;
155 }
156
157 ErrorStatus = IcsReadMaxSfb(bs, pIcsInfo, pSamplingRateInfo);
158 if (ErrorStatus != AAC_DEC_OK) {
159 goto bail;
160 }
161
162 if (IsLongBlock(pIcsInfo))
163 {
164 if ( !(flags & (AC_ELD|AC_SCALABLE|AC_BSAC|AC_USAC|AC_RSVD50)) ) /* If not ELD nor Scalable nor BSAC nor USAC syntax then ... */
165 {
166 if ((UCHAR)FDKreadBits(bs,1) != 0 ) /* UCHAR PredictorDataPresent */
167 {
168 ErrorStatus = AAC_DEC_UNSUPPORTED_PREDICTION;
169 goto bail;
170 }
171 }
172
173 pIcsInfo->WindowGroups = 1;
174 pIcsInfo->WindowGroupLength[0] = 1;
175 }
176 else
177 {
178 INT i;
179 UINT mask;
180
181 pIcsInfo->ScaleFactorGrouping = (UCHAR) FDKreadBits(bs,7);
182
183 pIcsInfo->WindowGroups = 0 ;
184
185 for (i=0; i < (8-1); i++)
186 {
187 mask = 1 << (6 - i);
188 pIcsInfo->WindowGroupLength[i] = 1;
189
190 if (pIcsInfo->ScaleFactorGrouping & mask)
191 {
192 pIcsInfo->WindowGroupLength[pIcsInfo->WindowGroups]++;
193 }
194 else
195 {
196 pIcsInfo->WindowGroups++;
197 }
198 }
199
200 /* loop runs to i < 7 only */
201 pIcsInfo->WindowGroupLength[8-1] = 1;
202 pIcsInfo->WindowGroups++;
203 }
204
205
206 bail:
207 if (ErrorStatus == AAC_DEC_OK)
208 pIcsInfo->Valid = 1;
209
210 return ErrorStatus;
211 }
212
213
214 /*
215 interleave codebooks the following way
216
217 9 (84w) | 1 (51w)
218 10 (82w) | 2 (39w)
219 SCL (65w) | 4 (38w)
220 3 (39w) | 5 (41w)
221 | 6 (40w)
222 | 7 (31w)
223 | 8 (31w)
224 (270w) (271w)
225 */
226
227
228 /*
229 Table entries are sorted as following:
230 | num_swb_long_window | sfbands_long | num_swb_short_window | sfbands_short |
231 */
getSamplingRateInfo(SamplingRateInfo * t,UINT samplesPerFrame,UINT samplingRateIndex,UINT samplingRate)232 AAC_DECODER_ERROR getSamplingRateInfo(
233 SamplingRateInfo *t,
234 UINT samplesPerFrame,
235 UINT samplingRateIndex,
236 UINT samplingRate
237 )
238 {
239 int index = 0;
240
241
242 t->samplingRateIndex = samplingRateIndex;
243 t->samplingRate = samplingRate;
244
245 switch (samplesPerFrame) {
246 case 1024:
247 index = 0;
248 break;
249 case 960:
250 index = 1;
251 break;
252 case 512:
253 index = 3;
254 break;
255 case 480:
256 index = 4;
257 break;
258
259 default:
260 return AAC_DEC_UNSUPPORTED_FORMAT;
261 }
262
263 t->ScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].sfbOffsetLong;
264 t->ScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].sfbOffsetShort;
265 t->NumberOfScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].numberOfSfbLong;
266 t->NumberOfScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].numberOfSfbShort;
267
268 if (t->ScaleFactorBands_Long == NULL || t->NumberOfScaleFactorBands_Long == 0) {
269 return AAC_DEC_UNSUPPORTED_FORMAT;
270 }
271
272 FDK_ASSERT(t->ScaleFactorBands_Long[t->NumberOfScaleFactorBands_Long] == samplesPerFrame);
273 FDK_ASSERT(t->ScaleFactorBands_Short == NULL || t->ScaleFactorBands_Short[t->NumberOfScaleFactorBands_Short]*8 == samplesPerFrame);
274
275 return AAC_DEC_OK;
276 }
277