2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
5 © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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.
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.
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.
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.
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:
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.
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.
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
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.
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."
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.
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
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.
73 5. CONTACT INFORMATION
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
78 91058 Erlangen, Germany
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
84 /******************************** MPEG Audio Encoder **************************
87 contents/description: CRC calculation
89 ******************************************************************************/
95 /*---------------- constants -----------------------*/
98 * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^15 + x^2 + x^0.
100 static const USHORT crcLookup_16_15_2_0
[256] =
102 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
103 0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
104 0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
105 0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041,
106 0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2,
107 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1,
108 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1,
109 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082,
110 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192,
111 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1,
112 0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1,
113 0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2,
114 0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151,
115 0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162,
116 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132,
117 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101,
118 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312,
119 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321,
120 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371,
121 0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342,
122 0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1,
123 0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2,
124 0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2,
125 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381,
126 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291,
127 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2,
128 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2,
129 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1,
130 0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252,
131 0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261,
132 0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231,
133 0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202
137 * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^12 + x^5 + x^0.
139 static const USHORT crcLookup_16_12_5_0
[256] =
141 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
142 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
143 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
144 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
145 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
146 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
147 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
148 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
149 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
150 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
151 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
152 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
153 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
154 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
155 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
156 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
157 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
158 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
159 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
160 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
161 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
162 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
163 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
164 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
165 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
166 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
167 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
168 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
169 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
170 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
171 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
172 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
176 /*--------------- function declarations --------------------*/
178 static inline INT
calcCrc_Bits(
182 HANDLE_FDK_BITSTREAM hBs
,
186 static inline INT
calcCrc_Bytes(
188 const USHORT
* pCrcLookup
,
189 HANDLE_FDK_BITSTREAM hBs
,
194 HANDLE_FDK_CRCINFO hCrcInfo
,
195 HANDLE_FDK_BITSTREAM hBs
,
200 /*------------- function definitions ----------------*/
203 HANDLE_FDK_CRCINFO hCrcInfo
,
205 const UINT crcStartValue
,
209 /* crc polynom example:
210 x^16 + x^15 + x^2 + x^0 (1) 1000 0000 0000 0101 -> 0x8005
211 x^16 + x^12 + x^5 + x^0 (1) 0001 0000 0010 0001 -> 0x1021
212 x^8 + x^4 + x^3 + x^2 + x^0 (1) 0001 1101 -> 0x001d */
214 hCrcInfo
->crcLen
= crcLen
;
215 hCrcInfo
->crcPoly
= crcPoly
;
216 hCrcInfo
->startValue
= crcStartValue
;
217 hCrcInfo
->crcMask
= (crcLen
) ? (1<<(crcLen
-1)) : 0;
219 FDKcrcReset(hCrcInfo
);
221 hCrcInfo
->pCrcLookup
= 0;
223 if (hCrcInfo
->crcLen
==16) {
226 hCrcInfo
->pCrcLookup
= crcLookup_16_15_2_0
;
229 hCrcInfo
->pCrcLookup
= crcLookup_16_12_5_0
;
233 /* no lookup table */
234 hCrcInfo
->pCrcLookup
= 0;
241 void FDKcrcReset(HANDLE_FDK_CRCINFO hCrcInfo
)
245 hCrcInfo
->crcValue
= hCrcInfo
->startValue
;
247 for(i
=0;i
<MAX_CRC_REGS
;i
++) {
248 hCrcInfo
->crcRegData
[i
].isActive
= 0;
250 hCrcInfo
->regStart
= 0;
251 hCrcInfo
->regStop
= 0;
255 HANDLE_FDK_CRCINFO hCrcInfo
,
256 const HANDLE_FDK_BITSTREAM hBs
,
260 int reg
= hCrcInfo
->regStart
;
262 FDK_ASSERT(hCrcInfo
->crcRegData
[reg
].isActive
==0);
263 hCrcInfo
->crcRegData
[reg
].isActive
= 1;
264 hCrcInfo
->crcRegData
[reg
].maxBits
= mBits
;
265 hCrcInfo
->crcRegData
[reg
].validBits
= FDKgetValidBits(hBs
) ;
266 hCrcInfo
->crcRegData
[reg
].bitBufCntBits
= 0;
268 hCrcInfo
->regStart
= (hCrcInfo
->regStart
+1)%MAX_CRC_REGS
;
274 HANDLE_FDK_CRCINFO hCrcInfo
,
275 const HANDLE_FDK_BITSTREAM hBs
,
279 FDK_ASSERT((reg
==(INT
)hCrcInfo
->regStop
)&&(hCrcInfo
->crcRegData
[reg
].isActive
==1));
281 if (hBs
->ConfigCache
==BS_WRITER
) {
282 hCrcInfo
->crcRegData
[reg
].bitBufCntBits
= FDKgetValidBits(hBs
) - hCrcInfo
->crcRegData
[reg
].validBits
;
285 hCrcInfo
->crcRegData
[reg
].bitBufCntBits
= hCrcInfo
->crcRegData
[reg
].validBits
- FDKgetValidBits(hBs
);
288 if (hCrcInfo
->crcRegData
[reg
].maxBits
== 0) {
289 hCrcInfo
->crcRegData
[reg
].maxBits
= hCrcInfo
->crcRegData
[reg
].bitBufCntBits
;
292 crcCalc( hCrcInfo
, hBs
, reg
);
294 hCrcInfo
->crcRegData
[reg
].isActive
= 0;
295 hCrcInfo
->regStop
= (hCrcInfo
->regStop
+1)%MAX_CRC_REGS
;
301 const HANDLE_FDK_CRCINFO hCrcInfo
304 return ( hCrcInfo
->crcValue
& (((hCrcInfo
->crcMask
-1)<<1)+1) );
308 * \brief Calculate crc bits.
310 * Calculate crc starting at current bitstream postion over nBits.
312 * \param pCrc Pointer to an outlying allocated crc info structure.
313 * \param crcMask CrcMask in use.
314 * \param crcPoly Crc polynom in use.
315 * \param hBs Handle to current bit buffer structure.
316 * \param nBits Number of processing bits.
318 * \return Number of processed bits.
320 static inline INT
calcCrc_Bits(
324 HANDLE_FDK_BITSTREAM hBs
,
329 USHORT crc
= *pCrc
; /* get crc value */
332 for (i
= 0; (i
< nBits
); i
++) {
333 USHORT tmp
= FDKreadBits(hBs
,1); // process single bit
334 tmp
^= ( (crc
& crcMask
) ? 1 : 0 );
341 for (i
= 0; (i
< nBits
); i
++) {
342 USHORT tmp
= 0; // process single bit
343 tmp
^= ( (crc
& crcMask
) ? 1 : 0 );
349 *pCrc
= crc
; /* update crc value */
355 * \brief Calculate crc bytes.
357 * Calculate crc starting at current bitstream postion over nBytes.
359 * \param pCrc Pointer to an outlying allocated crc info structure.
360 * \param pCrcLookup Pointer to lookup table used for fast crc calculation.
361 * \param hBs Handle to current bit buffer structure.
362 * \param nBits Number of processing bytes.
364 * \return Number of processed bits.
366 static inline INT
calcCrc_Bytes(
368 const USHORT
* pCrcLookup
,
369 HANDLE_FDK_BITSTREAM hBs
,
374 USHORT crc
= *pCrc
; /* get crc value */
377 for (i
=0; i
<nBytes
; i
++) {
378 crc
= (crc
<<8)^pCrcLookup
[((crc
>>8)^((UCHAR
)FDKreadBits(hBs
,8)))&0xFF];
382 for (i
=0; i
<nBytes
; i
++) {
383 crc
= (crc
<<8)^pCrcLookup
[((crc
>>8)^((UCHAR
)0))&0xFF];
387 *pCrc
= crc
; /* update crc value */
393 * \brief Calculate crc.
395 * Calculate crc. Lenght depends on mBits parameter in FDKcrcStartReg() configuration.
397 * \param hCrcInfo Pointer to an outlying allocated crc info structure.
398 * \param hBs Pointer to current bit buffer structure.
399 * \param reg Crc region ID.
401 * \return Number of processed bits.
404 HANDLE_FDK_CRCINFO hCrcInfo
,
405 HANDLE_FDK_BITSTREAM hBs
,
409 USHORT crc
= hCrcInfo
->crcValue
;
410 CCrcRegData
*rD
= &hCrcInfo
->crcRegData
[reg
];
411 FDK_BITSTREAM bsReader
;
413 if (hBs
->ConfigCache
==BS_READER
) {
415 FDKpushBiDirectional(&bsReader
, -(INT
)(rD
->validBits
-FDKgetValidBits(&bsReader
)));
418 FDKinitBitStream(&bsReader
, hBs
->hBitBuf
.Buffer
, hBs
->hBitBuf
.bufSize
, hBs
->hBitBuf
.ValidBits
, BS_READER
);
419 FDKpushBiDirectional(&bsReader
, rD
->validBits
);
423 rBits
= (rD
->maxBits
>=0) ? rD
->maxBits
: -rD
->maxBits
; /* ramaining bits */
424 if ((rD
->maxBits
>0) && (((INT
)rD
->bitBufCntBits
>>3<<3)<rBits
) ) {
425 bits
= rD
->bitBufCntBits
;
431 int words
= bits
>> 3; /* processing bytes */
432 int mBits
= bits
& 0x7; /* modulo bits */
434 if(hCrcInfo
->pCrcLookup
) {
435 rBits
-= (calcCrc_Bytes(&crc
, hCrcInfo
->pCrcLookup
, &bsReader
, words
)<<3);
438 rBits
-= calcCrc_Bits(&crc
, hCrcInfo
->crcMask
, hCrcInfo
->crcPoly
, &bsReader
, words
<<3 );
441 /* remaining valid bits*/
443 rBits
-= calcCrc_Bits(&crc
, hCrcInfo
->crcMask
, hCrcInfo
->crcPoly
, &bsReader
, mBits
);
448 if ( (hCrcInfo
->pCrcLookup
) && (rBits
>8) ) {
449 rBits
-= (calcCrc_Bytes(&crc
, hCrcInfo
->pCrcLookup
, NULL
, rBits
>>3)<<3);
451 /* remaining zero bits */
453 rBits
-= calcCrc_Bits(&crc
, hCrcInfo
->crcMask
, hCrcInfo
->crcPoly
, NULL
, rBits
);
457 hCrcInfo
->crcValue
= crc
;