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 Remaining SBR Bit Writing Routines
87 */
88
89 #include "env_bit.h"
90 #include "cmondata.h"
91
92
93 #ifndef min
94 #define min(a,b) ( a < b ? a:b)
95 #endif
96
97 #ifndef max
98 #define max(a,b) ( a > b ? a:b)
99 #endif
100
101 /* ***************************** crcAdvance **********************************/
102 /**
103 * @fn
104 * @brief updates crc data register
105 * @return none
106 *
107 * This function updates the crc register
108 *
109 */
crcAdvance(USHORT crcPoly,USHORT crcMask,USHORT * crc,ULONG bValue,INT bBits)110 static void crcAdvance(USHORT crcPoly,
111 USHORT crcMask,
112 USHORT *crc,
113 ULONG bValue,
114 INT bBits
115 )
116 {
117 INT i;
118 USHORT flag;
119
120 for (i=bBits-1; i>=0; i--) {
121 flag = ((*crc) & crcMask) ? (1) : (0) ;
122 flag ^= (bValue & (1<<i)) ? (1) : (0) ;
123
124 (*crc)<<=1;
125 if(flag) (*crc) ^= crcPoly;
126 }
127 }
128
129
130 /* ***************************** FDKsbrEnc_InitSbrBitstream **********************************/
131 /**
132 * @fn
133 * @brief Inittialisation of sbr bitstream, write of dummy header and CRC
134 * @return none
135 *
136 *
137 *
138 */
139
FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData,UCHAR * memoryBase,INT memorySize,HANDLE_FDK_CRCINFO hCrcInfo,UINT sbrSyntaxFlags)140 INT FDKsbrEnc_InitSbrBitstream(HANDLE_COMMON_DATA hCmonData,
141 UCHAR *memoryBase, /*!< Pointer to bitstream buffer */
142 INT memorySize, /*!< Length of bitstream buffer in bytes */
143 HANDLE_FDK_CRCINFO hCrcInfo,
144 UINT sbrSyntaxFlags) /*!< SBR syntax flags */
145 {
146 INT crcRegion = 0;
147
148 /* reset bit buffer */
149 FDKresetBitbuffer(&hCmonData->sbrBitbuf, BS_WRITER);
150
151 FDKinitBitStream(&hCmonData->tmpWriteBitbuf, memoryBase,
152 memorySize, 0, BS_WRITER);
153
154 if (sbrSyntaxFlags & SBR_SYNTAX_CRC) {
155 if (sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC)
156 { /* Init and start CRC region */
157 FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_DRM_CRC_BITS);
158 FDKcrcInit( hCrcInfo, 0x001d, 0xFFFF, SI_SBR_DRM_CRC_BITS );
159 crcRegion = FDKcrcStartReg( hCrcInfo, &hCmonData->sbrBitbuf, 0 );
160 } else {
161 FDKwriteBits (&hCmonData->sbrBitbuf, 0x0, SI_SBR_CRC_BITS);
162 }
163 }
164
165 return (crcRegion);
166 }
167
168
169 /* ************************** FDKsbrEnc_AssembleSbrBitstream *******************************/
170 /**
171 * @fn
172 * @brief Formats the SBR payload
173 * @return nothing
174 *
175 * Also the CRC will be calculated here.
176 *
177 */
178
179 void
FDKsbrEnc_AssembleSbrBitstream(HANDLE_COMMON_DATA hCmonData,HANDLE_FDK_CRCINFO hCrcInfo,INT crcRegion,UINT sbrSyntaxFlags)180 FDKsbrEnc_AssembleSbrBitstream( HANDLE_COMMON_DATA hCmonData,
181 HANDLE_FDK_CRCINFO hCrcInfo,
182 INT crcRegion,
183 UINT sbrSyntaxFlags)
184 {
185 USHORT crcReg = SBR_CRCINIT;
186 INT numCrcBits,i;
187
188 /* check if SBR is present */
189 if ( hCmonData==NULL )
190 return;
191
192 hCmonData->sbrFillBits = 0; /* Fill bits are written only for GA streams */
193
194 if ( sbrSyntaxFlags & SBR_SYNTAX_DRM_CRC )
195 {
196 /*
197 * Calculate and write DRM CRC
198 */
199 FDKcrcEndReg( hCrcInfo, &hCmonData->sbrBitbuf, crcRegion );
200 FDKwriteBits( &hCmonData->tmpWriteBitbuf, FDKcrcGetCRC(hCrcInfo)^0xFF, SI_SBR_DRM_CRC_BITS );
201 }
202 else
203 {
204 if ( !(sbrSyntaxFlags & SBR_SYNTAX_LOW_DELAY) )
205 {
206 /* Do alignment here, because its defined as part of the sbr_extension_data */
207 int sbrLoad = hCmonData->sbrHdrBits + hCmonData->sbrDataBits;
208
209 if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) {
210 sbrLoad += SI_SBR_CRC_BITS;
211 }
212
213 sbrLoad += 4; /* Do byte Align with 4 bit offset. ISO/IEC 14496-3:2005(E) page 39. */
214
215 hCmonData->sbrFillBits = (8 - (sbrLoad % 8)) % 8;
216
217 /*
218 append fill bits
219 */
220 FDKwriteBits(&hCmonData->sbrBitbuf, 0, hCmonData->sbrFillBits );
221
222 FDK_ASSERT(FDKgetValidBits(&hCmonData->sbrBitbuf) % 8 == 4);
223 }
224
225 /*
226 calculate crc
227 */
228 if ( sbrSyntaxFlags & SBR_SYNTAX_CRC ) {
229 FDK_BITSTREAM tmpCRCBuf = hCmonData->sbrBitbuf;
230 FDKresetBitbuffer( &tmpCRCBuf, BS_READER );
231
232 numCrcBits = hCmonData->sbrHdrBits + hCmonData->sbrDataBits + hCmonData->sbrFillBits;
233
234 for(i=0;i<numCrcBits;i++){
235 INT bit;
236 bit = FDKreadBits(&tmpCRCBuf,1);
237 crcAdvance(SBR_CRC_POLY,SBR_CRC_MASK,&crcReg,bit,1);
238 }
239 crcReg &= (SBR_CRC_RANGE);
240
241 /*
242 * Write CRC data.
243 */
244 FDKwriteBits (&hCmonData->tmpWriteBitbuf, crcReg, SI_SBR_CRC_BITS);
245 }
246 }
247
248 FDKsyncCache(&hCmonData->tmpWriteBitbuf);
249 }
250
251