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 Remaining SBR Bit Writing Routines
106 */
107
108 #include "env_bit.h"
109 #include "cmondata.h"
110
111 #ifndef min
112 #define min(a, b) (a < b ? a : b)
113 #endif
114
115 #ifndef max
116 #define max(a, b) (a > b ? a : b)
117 #endif
118
119 /* ***************************** crcAdvance **********************************/
120 /**
121 * @fn
122 * @brief updates crc data register
123 * @return none
124 *
125 * This function updates the crc register
126 *
127 */
crcAdvance(USHORT crcPoly,USHORT crcMask,USHORT * crc,ULONG bValue,INT bBits)128 static void crcAdvance(USHORT crcPoly, USHORT crcMask, USHORT *crc,
129 ULONG bValue, INT bBits) {
130 INT i;
131 USHORT flag;
132
133 for (i = bBits - 1; i >= 0; i--) {
134 flag = ((*crc) & crcMask) ? (1) : (0);
135 flag ^= (bValue & (1 << i)) ? (1) : (0);
136
137 (*crc) <<= 1;
138 if (flag) (*crc) ^= crcPoly;
139 }
140 }
141
142 /* ***************************** FDKsbrEnc_InitSbrBitstream
143 * **********************************/
144 /**
145 * @fn
146 * @brief Inittialisation of sbr bitstream, write of dummy header and CRC
147 * @return none
148 *
149 *
150 *
151 */
152
FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData,UCHAR * memoryBase,INT memorySize,HANDLE_FDK_CRCINFO hCrcInfo,UINT sbrSyntaxFlags)153 INT FDKsbrEnc_InitSbrBitstream(
154 HANDLE_COMMON_DATA hCmonData,
155 UCHAR *memoryBase, /*!< Pointer to bitstream buffer */
156 INT memorySize, /*!< Length of bitstream buffer in bytes */
157 HANDLE_FDK_CRCINFO hCrcInfo, UINT sbrSyntaxFlags) /*!< SBR syntax flags */
158 {
159 INT crcRegion = 0;
160
161 /* reset bit buffer */
162 FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER);
163
164 FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase, memorySize, 0,
165 BS_WRITER);
166
167 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
168 if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) { /* Init and start CRC region */
169 FDKwriteBits(&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS);
170 FDKcrcInit(hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS);
171 crcRegion = FDKcrcStartReg(hCrcInfo, &hCmonData->sbrBitbuf, 0);
172 } else {
173 FDKwriteBits(&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS);
174 }
175 }
176
177 return (crcRegion);
178 }
179
180 /* ************************** FDKsbrEnc_AssembleSbrBitstream
181 * *******************************/
182 /**
183 * @fn
184 * @brief Formats the SBR payload
185 * @return nothing
186 *
187 * Also the CRC will be calculated here.
188 *
189 */
190
FDKsbrEnc_AssembleSbrBitstream(HANDLE_COMMON_DATA hCmonData,HANDLE_FDK_CRCINFO hCrcInfo,INT crcRegion,UINT sbrSyntaxFlags)191 void FDKsbrEnc_AssembleSbrBitstream(HANDLE_COMMON_DATA hCmonData,
192 HANDLE_FDK_CRCINFO hCrcInfo, INT crcRegion,
193 UINT sbrSyntaxFlags) {
194 USHORT crcReg = SBR_CRCINIT;
195 INT numCrcBits, i;
196
197 /* check if SBR is present */
198 if (hCmonData == NULL) return;
199
200 hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */
201
202 if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC) {
203 /*
204 * Calculate and write DRM CRC
205 */
206 FDKcrcEndReg(hCrcInfo, &hCmonData->sbrBitbuf, crcRegion);
207 FDKwriteBits(&hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo) ^ 0xFF,
208 SI_SBR_DRM_CRC_BITS);
209 } else {
210 if (!(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY)) {
211 /* Do alignment here, because its defined as part of the
212 * sbr_extension_data */
213 int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits;
214
215 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
216 sbrLoad += SI_SBR_CRC_BITS;
217 }
218
219 sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E)
220 page 39. */
221
222 hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8;
223
224 /*
225 append fill bits
226 */
227 FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits);
228
229 FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4);
230 }
231
232 /*
233 calculate crc
234 */
235 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
236 FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf;
237 FDKresetBitbuffer(&tmpCRCBuf, BS_READER);
238
239 numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits +
240 hCmonData->sbrFillBits;
241
242 for (i = 0; i < numCrcBits; i++) {
243 INT bit;
244 bit = FDKreadBits(&tmpCRCBuf, 1);
245 crcAdvance(SBR_CRC_POLY, SBR_CRC_MASK, &crcReg, bit, 1);
246 }
247 crcReg &= (SBR_CRC_RANGE);
248
249 /*
250 * Write CRC data.
251 */
252 FDKwriteBits(&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS);
253 }
254 }
255
256 FDKsyncCache(&hCmonData->tmpWriteBitbuf);
257 }
258