/src/aac/libFDK/src/FDK_crc.cpp
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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 | | /******************* Library for basic calculation routines ******************** |
96 | | |
97 | | Author(s): |
98 | | |
99 | | Description: CRC calculation |
100 | | |
101 | | *******************************************************************************/ |
102 | | |
103 | | #include "FDK_crc.h" |
104 | | |
105 | | /*---------------- constants -----------------------*/ |
106 | | |
107 | | /** |
108 | | * \brief This table defines precalculated lookup tables for crc polynom x^16 |
109 | | * + x^15 + x^2 + x^0. |
110 | | */ |
111 | | static const USHORT crcLookup_16_15_2_0[256] = { |
112 | | 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011, 0x8033, |
113 | | 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022, 0x8063, 0x0066, |
114 | | 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072, 0x0050, 0x8055, 0x805f, |
115 | | 0x005a, 0x804b, 0x004e, 0x0044, 0x8041, 0x80c3, 0x00c6, 0x00cc, 0x80c9, |
116 | | 0x00d8, 0x80dd, 0x80d7, 0x00d2, 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, |
117 | | 0x00ee, 0x00e4, 0x80e1, 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, |
118 | | 0x00b4, 0x80b1, 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, |
119 | | 0x0082, 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192, |
120 | | 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1, 0x01e0, |
121 | | 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1, 0x81d3, 0x01d6, |
122 | | 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2, 0x0140, 0x8145, 0x814f, |
123 | | 0x014a, 0x815b, 0x015e, 0x0154, 0x8151, 0x8173, 0x0176, 0x017c, 0x8179, |
124 | | 0x0168, 0x816d, 0x8167, 0x0162, 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, |
125 | | 0x813d, 0x8137, 0x0132, 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, |
126 | | 0x0104, 0x8101, 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, |
127 | | 0x0312, 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321, |
128 | | 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371, 0x8353, |
129 | | 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342, 0x03c0, 0x83c5, |
130 | | 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1, 0x83f3, 0x03f6, 0x03fc, |
131 | | 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2, 0x83a3, 0x03a6, 0x03ac, 0x83a9, |
132 | | 0x03b8, 0x83bd, 0x83b7, 0x03b2, 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, |
133 | | 0x038e, 0x0384, 0x8381, 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, |
134 | | 0x0294, 0x8291, 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, |
135 | | 0x02a2, 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2, |
136 | | 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1, 0x8243, |
137 | | 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252, 0x0270, 0x8275, |
138 | | 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261, 0x0220, 0x8225, 0x822f, |
139 | | 0x022a, 0x823b, 0x023e, 0x0234, 0x8231, 0x8213, 0x0216, 0x021c, 0x8219, |
140 | | 0x0208, 0x820d, 0x8207, 0x0202}; |
141 | | |
142 | | /** |
143 | | * \brief This table defines precalculated lookup tables for crc polynom x^16 |
144 | | * + x^12 + x^5 + x^0. |
145 | | */ |
146 | | static const USHORT crcLookup_16_12_5_0[256] = { |
147 | | 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, |
148 | | 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, |
149 | | 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, |
150 | | 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, |
151 | | 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, |
152 | | 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, |
153 | | 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, |
154 | | 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, |
155 | | 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, |
156 | | 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, |
157 | | 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, |
158 | | 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, |
159 | | 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, |
160 | | 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, |
161 | | 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, |
162 | | 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, |
163 | | 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, |
164 | | 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, |
165 | | 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, |
166 | | 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, |
167 | | 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, |
168 | | 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, |
169 | | 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, |
170 | | 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, |
171 | | 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, |
172 | | 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, |
173 | | 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, |
174 | | 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, |
175 | | 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0}; |
176 | | |
177 | | /** |
178 | | * \brief This table defines precalculated lookup tables for crc polynom x^16 |
179 | | * + x^15 + x^5 + x^0. |
180 | | */ |
181 | | |
182 | | static const USHORT crcLookup_16_15_5_0[256] = { |
183 | | 0x0000, 0x8021, 0x8063, 0x0042, 0x80e7, 0x00c6, 0x0084, 0x80a5, 0x81ef, |
184 | | 0x01ce, 0x018c, 0x81ad, 0x0108, 0x8129, 0x816b, 0x014a, 0x83ff, 0x03de, |
185 | | 0x039c, 0x83bd, 0x0318, 0x8339, 0x837b, 0x035a, 0x0210, 0x8231, 0x8273, |
186 | | 0x0252, 0x82f7, 0x02d6, 0x0294, 0x82b5, 0x87df, 0x07fe, 0x07bc, 0x879d, |
187 | | 0x0738, 0x8719, 0x875b, 0x077a, 0x0630, 0x8611, 0x8653, 0x0672, 0x86d7, |
188 | | 0x06f6, 0x06b4, 0x8695, 0x0420, 0x8401, 0x8443, 0x0462, 0x84c7, 0x04e6, |
189 | | 0x04a4, 0x8485, 0x85cf, 0x05ee, 0x05ac, 0x858d, 0x0528, 0x8509, 0x854b, |
190 | | 0x056a, 0x8f9f, 0x0fbe, 0x0ffc, 0x8fdd, 0x0f78, 0x8f59, 0x8f1b, 0x0f3a, |
191 | | 0x0e70, 0x8e51, 0x8e13, 0x0e32, 0x8e97, 0x0eb6, 0x0ef4, 0x8ed5, 0x0c60, |
192 | | 0x8c41, 0x8c03, 0x0c22, 0x8c87, 0x0ca6, 0x0ce4, 0x8cc5, 0x8d8f, 0x0dae, |
193 | | 0x0dec, 0x8dcd, 0x0d68, 0x8d49, 0x8d0b, 0x0d2a, 0x0840, 0x8861, 0x8823, |
194 | | 0x0802, 0x88a7, 0x0886, 0x08c4, 0x88e5, 0x89af, 0x098e, 0x09cc, 0x89ed, |
195 | | 0x0948, 0x8969, 0x892b, 0x090a, 0x8bbf, 0x0b9e, 0x0bdc, 0x8bfd, 0x0b58, |
196 | | 0x8b79, 0x8b3b, 0x0b1a, 0x0a50, 0x8a71, 0x8a33, 0x0a12, 0x8ab7, 0x0a96, |
197 | | 0x0ad4, 0x8af5, 0x9f1f, 0x1f3e, 0x1f7c, 0x9f5d, 0x1ff8, 0x9fd9, 0x9f9b, |
198 | | 0x1fba, 0x1ef0, 0x9ed1, 0x9e93, 0x1eb2, 0x9e17, 0x1e36, 0x1e74, 0x9e55, |
199 | | 0x1ce0, 0x9cc1, 0x9c83, 0x1ca2, 0x9c07, 0x1c26, 0x1c64, 0x9c45, 0x9d0f, |
200 | | 0x1d2e, 0x1d6c, 0x9d4d, 0x1de8, 0x9dc9, 0x9d8b, 0x1daa, 0x18c0, 0x98e1, |
201 | | 0x98a3, 0x1882, 0x9827, 0x1806, 0x1844, 0x9865, 0x992f, 0x190e, 0x194c, |
202 | | 0x996d, 0x19c8, 0x99e9, 0x99ab, 0x198a, 0x9b3f, 0x1b1e, 0x1b5c, 0x9b7d, |
203 | | 0x1bd8, 0x9bf9, 0x9bbb, 0x1b9a, 0x1ad0, 0x9af1, 0x9ab3, 0x1a92, 0x9a37, |
204 | | 0x1a16, 0x1a54, 0x9a75, 0x1080, 0x90a1, 0x90e3, 0x10c2, 0x9067, 0x1046, |
205 | | 0x1004, 0x9025, 0x916f, 0x114e, 0x110c, 0x912d, 0x1188, 0x91a9, 0x91eb, |
206 | | 0x11ca, 0x937f, 0x135e, 0x131c, 0x933d, 0x1398, 0x93b9, 0x93fb, 0x13da, |
207 | | 0x1290, 0x92b1, 0x92f3, 0x12d2, 0x9277, 0x1256, 0x1214, 0x9235, 0x975f, |
208 | | 0x177e, 0x173c, 0x971d, 0x17b8, 0x9799, 0x97db, 0x17fa, 0x16b0, 0x9691, |
209 | | 0x96d3, 0x16f2, 0x9657, 0x1676, 0x1634, 0x9615, 0x14a0, 0x9481, 0x94c3, |
210 | | 0x14e2, 0x9447, 0x1466, 0x1424, 0x9405, 0x954f, 0x156e, 0x152c, 0x950d, |
211 | | 0x15a8, 0x9589, 0x95cb, 0x15ea, |
212 | | }; |
213 | | |
214 | | /*--------------- function declarations --------------------*/ |
215 | | |
216 | | static inline INT calcCrc_Bits(USHORT *const pCrc, USHORT crcMask, |
217 | | USHORT crcPoly, HANDLE_FDK_BITSTREAM hBs, |
218 | | INT nBits); |
219 | | |
220 | | static inline INT calcCrc_Bytes(USHORT *const pCrc, const USHORT *pCrcLookup, |
221 | | HANDLE_FDK_BITSTREAM hBs, INT nBytes); |
222 | | |
223 | | static void crcCalc(HANDLE_FDK_CRCINFO hCrcInfo, HANDLE_FDK_BITSTREAM hBs, |
224 | | const INT reg); |
225 | | |
226 | | /*------------- function definitions ----------------*/ |
227 | | |
228 | | void FDKcrcInit(HANDLE_FDK_CRCINFO hCrcInfo, const UINT crcPoly, |
229 | 0 | const UINT crcStartValue, const UINT crcLen) { |
230 | | /* crc polynom example: |
231 | | x^16 + x^15 + x^5 + x^0 (1) 1000 0000 0010 0001 -> 0x8021 |
232 | | x^16 + x^15 + x^2 + x^0 (1) 1000 0000 0000 0101 -> 0x8005 |
233 | | x^16 + x^12 + x^5 + x^0 (1) 0001 0000 0010 0001 -> 0x1021 |
234 | | x^8 + x^4 + x^3 + x^2 + x^0 (1) 0001 1101 -> 0x001d */ |
235 | |
|
236 | 0 | hCrcInfo->crcLen = crcLen; |
237 | 0 | hCrcInfo->crcPoly = crcPoly; |
238 | 0 | hCrcInfo->startValue = crcStartValue; |
239 | 0 | hCrcInfo->crcMask = (crcLen) ? (1 << (crcLen - 1)) : 0; |
240 | |
|
241 | 0 | FDKcrcReset(hCrcInfo); |
242 | |
|
243 | 0 | hCrcInfo->pCrcLookup = |
244 | 0 | 0; /* Preset 0 for "crcLen" != 16 or unknown 16-bit polynoms "crcPoly" */ |
245 | |
|
246 | 0 | if (hCrcInfo->crcLen == 16) { |
247 | 0 | switch (crcPoly) { |
248 | 0 | case 0x8021: |
249 | 0 | hCrcInfo->pCrcLookup = crcLookup_16_15_5_0; |
250 | 0 | break; |
251 | 0 | case 0x8005: |
252 | 0 | hCrcInfo->pCrcLookup = crcLookup_16_15_2_0; |
253 | 0 | break; |
254 | 0 | case 0x1021: |
255 | 0 | hCrcInfo->pCrcLookup = crcLookup_16_12_5_0; |
256 | 0 | break; |
257 | 0 | case 0x001d: |
258 | 0 | default: |
259 | | /* no lookup table */ |
260 | 0 | break; |
261 | 0 | } |
262 | 0 | } |
263 | 0 | } |
264 | | |
265 | 0 | void FDKcrcReset(HANDLE_FDK_CRCINFO hCrcInfo) { |
266 | 0 | int i; |
267 | |
|
268 | 0 | hCrcInfo->crcValue = hCrcInfo->startValue; |
269 | |
|
270 | 0 | for (i = 0; i < MAX_CRC_REGS; i++) { |
271 | 0 | hCrcInfo->crcRegData[i].isActive = 0; |
272 | 0 | } |
273 | 0 | hCrcInfo->regStart = 0; |
274 | 0 | hCrcInfo->regStop = 0; |
275 | 0 | } |
276 | | |
277 | | INT FDKcrcStartReg(HANDLE_FDK_CRCINFO hCrcInfo, const HANDLE_FDK_BITSTREAM hBs, |
278 | 0 | const INT mBits) { |
279 | 0 | int reg = hCrcInfo->regStart; |
280 | |
|
281 | 0 | FDK_ASSERT(hCrcInfo->crcRegData[reg].isActive == 0); |
282 | 0 | hCrcInfo->crcRegData[reg].isActive = 1; |
283 | 0 | hCrcInfo->crcRegData[reg].maxBits = mBits; |
284 | 0 | hCrcInfo->crcRegData[reg].validBits = (INT)FDKgetValidBits(hBs); |
285 | 0 | hCrcInfo->crcRegData[reg].bitBufCntBits = 0; |
286 | |
|
287 | 0 | hCrcInfo->regStart = (hCrcInfo->regStart + 1) % MAX_CRC_REGS; |
288 | |
|
289 | 0 | return (reg); |
290 | 0 | } |
291 | | |
292 | | INT FDKcrcEndReg(HANDLE_FDK_CRCINFO hCrcInfo, const HANDLE_FDK_BITSTREAM hBs, |
293 | 0 | const INT reg) { |
294 | 0 | FDK_ASSERT((reg == (INT)hCrcInfo->regStop) && |
295 | 0 | (hCrcInfo->crcRegData[reg].isActive == 1)); |
296 | | |
297 | 0 | if (hBs->ConfigCache == BS_WRITER) { |
298 | 0 | hCrcInfo->crcRegData[reg].bitBufCntBits = |
299 | 0 | (INT)FDKgetValidBits(hBs) - hCrcInfo->crcRegData[reg].validBits; |
300 | 0 | } else { |
301 | 0 | hCrcInfo->crcRegData[reg].bitBufCntBits = |
302 | 0 | hCrcInfo->crcRegData[reg].validBits - (INT)FDKgetValidBits(hBs); |
303 | 0 | } |
304 | |
|
305 | 0 | if (hCrcInfo->crcRegData[reg].maxBits == 0) { |
306 | 0 | hCrcInfo->crcRegData[reg].maxBits = hCrcInfo->crcRegData[reg].bitBufCntBits; |
307 | 0 | } |
308 | |
|
309 | 0 | crcCalc(hCrcInfo, hBs, reg); |
310 | |
|
311 | 0 | hCrcInfo->crcRegData[reg].isActive = 0; |
312 | 0 | hCrcInfo->regStop = (hCrcInfo->regStop + 1) % MAX_CRC_REGS; |
313 | |
|
314 | 0 | return 0; |
315 | 0 | } |
316 | | |
317 | 0 | USHORT FDKcrcGetCRC(const HANDLE_FDK_CRCINFO hCrcInfo) { |
318 | 0 | return (hCrcInfo->crcValue & (((hCrcInfo->crcMask - 1) << 1) + 1)); |
319 | 0 | } |
320 | | |
321 | | /** |
322 | | * \brief Calculate crc bits. |
323 | | * |
324 | | * Calculate crc starting at current bitstream postion over nBits. |
325 | | * |
326 | | * \param pCrc Pointer to an outlying allocated crc info |
327 | | * structure. |
328 | | * \param crcMask CrcMask in use. |
329 | | * \param crcPoly Crc polynom in use. |
330 | | * \param hBs Handle to current bit buffer structure. |
331 | | * \param nBits Number of processing bits. |
332 | | * |
333 | | * \return Number of processed bits. |
334 | | */ |
335 | | static inline INT calcCrc_Bits(USHORT *const pCrc, USHORT crcMask, |
336 | | USHORT crcPoly, HANDLE_FDK_BITSTREAM hBs, |
337 | 0 | INT nBits) { |
338 | 0 | int i; |
339 | 0 | USHORT crc = *pCrc; /* get crc value */ |
340 | |
|
341 | 0 | if (hBs != NULL) { |
342 | 0 | for (i = 0; (i < nBits); i++) { |
343 | 0 | USHORT tmp = FDKreadBit(hBs); // process single bit |
344 | 0 | tmp ^= ((crc & crcMask) ? 1 : 0); |
345 | 0 | if (tmp != 0) tmp = crcPoly; |
346 | 0 | crc <<= 1; |
347 | 0 | crc ^= tmp; |
348 | 0 | } |
349 | 0 | } else { |
350 | 0 | for (i = 0; (i < nBits); i++) { |
351 | 0 | USHORT tmp = (crc & crcMask) ? crcPoly : 0; // process single bit |
352 | 0 | crc <<= 1; |
353 | 0 | crc ^= tmp; |
354 | 0 | } |
355 | 0 | } |
356 | 0 | *pCrc = crc; /* update crc value */ |
357 | |
|
358 | 0 | return nBits; |
359 | 0 | } |
360 | | |
361 | | /** |
362 | | * \brief Calculate crc bytes. |
363 | | * |
364 | | * Calculate crc starting at current bitstream postion over nBytes. |
365 | | * |
366 | | * \param pCrc Pointer to an outlying allocated crc info |
367 | | * structure. |
368 | | * \param pCrcLookup Pointer to lookup table used for fast crc |
369 | | * calculation. |
370 | | * \param hBs Handle to current bit buffer structure. |
371 | | * \param nBits Number of processing bytes. |
372 | | * |
373 | | * \return Number of processed bits. |
374 | | */ |
375 | | |
376 | | static inline INT calcCrc_Bytes(USHORT *const pCrc, const USHORT *pCrcLookup, |
377 | 0 | HANDLE_FDK_BITSTREAM hBs, INT nBytes) { |
378 | 0 | int i; |
379 | 0 | USHORT crc = *pCrc; /* get crc value */ |
380 | |
|
381 | 0 | if (hBs != NULL) { |
382 | 0 | ULONG data; |
383 | 0 | INT bits; |
384 | 0 | for (i = 0; i < (nBytes >> 2); i++) { |
385 | 0 | data = (ULONG)FDKreadBits(hBs, 32); |
386 | 0 | crc = |
387 | 0 | (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 24))) & 0xFF]; |
388 | 0 | crc = |
389 | 0 | (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 16))) & 0xFF]; |
390 | 0 | crc = |
391 | 0 | (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 8))) & 0xFF]; |
392 | 0 | crc = |
393 | 0 | (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 0))) & 0xFF]; |
394 | 0 | } |
395 | 0 | bits = (nBytes & 3) << 3; |
396 | 0 | if (bits > 0) { |
397 | 0 | data = (ULONG)FDKreadBits(hBs, bits); |
398 | 0 | for (bits -= 8; bits >= 0; bits -= 8) |
399 | 0 | crc = (crc << 8) ^ |
400 | 0 | pCrcLookup[((crc >> 8) ^ (USHORT)(data >> bits)) & 0xFF]; |
401 | 0 | } |
402 | 0 | } else { |
403 | 0 | for (i = 0; i < nBytes; i++) { |
404 | 0 | crc = (crc << 8) ^ pCrcLookup[(crc >> 8) & 0xFF]; |
405 | 0 | } |
406 | 0 | } |
407 | |
|
408 | 0 | *pCrc = crc; /* update crc value */ |
409 | |
|
410 | 0 | return (nBytes); |
411 | 0 | } |
412 | | |
413 | | /** |
414 | | * \brief Calculate crc. |
415 | | * |
416 | | * Calculate crc. Lenght depends on mBits parameter in FDKcrcStartReg() |
417 | | * configuration. |
418 | | * |
419 | | * \param hCrcInfo Pointer to an outlying allocated crc info |
420 | | * structure. |
421 | | * \param hBs Pointer to current bit buffer structure. |
422 | | * \param reg Crc region ID. |
423 | | * |
424 | | * \return Number of processed bits. |
425 | | */ |
426 | | static void crcCalc(HANDLE_FDK_CRCINFO hCrcInfo, HANDLE_FDK_BITSTREAM hBs, |
427 | 0 | const INT reg) { |
428 | 0 | USHORT crc = hCrcInfo->crcValue; |
429 | 0 | CCrcRegData *rD = &hCrcInfo->crcRegData[reg]; |
430 | 0 | FDK_BITSTREAM bsReader; |
431 | |
|
432 | 0 | if (hBs->ConfigCache == BS_READER) { |
433 | 0 | bsReader = *hBs; |
434 | 0 | FDKpushBiDirectional(&bsReader, |
435 | 0 | -(rD->validBits - (INT)FDKgetValidBits(&bsReader))); |
436 | 0 | } else { |
437 | 0 | FDKinitBitStream(&bsReader, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, |
438 | 0 | hBs->hBitBuf.ValidBits, BS_READER); |
439 | 0 | FDKpushBiDirectional(&bsReader, rD->validBits); |
440 | 0 | } |
441 | |
|
442 | 0 | int bits, rBits; |
443 | 0 | rBits = (rD->maxBits >= 0) ? rD->maxBits : -rD->maxBits; /* ramaining bits */ |
444 | 0 | if ((rD->maxBits > 0) && ((rD->bitBufCntBits >> 3 << 3) < rBits)) { |
445 | 0 | bits = rD->bitBufCntBits; |
446 | 0 | } else { |
447 | 0 | bits = rBits; |
448 | 0 | } |
449 | |
|
450 | 0 | int words = bits >> 3; /* processing bytes */ |
451 | 0 | int mBits = bits & 0x7; /* modulo bits */ |
452 | |
|
453 | 0 | if (hCrcInfo->pCrcLookup) { |
454 | 0 | rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, &bsReader, words) << 3); |
455 | 0 | } else { |
456 | 0 | rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, |
457 | 0 | words << 3); |
458 | 0 | } |
459 | | |
460 | | /* remaining valid bits*/ |
461 | 0 | if (mBits != 0) { |
462 | 0 | rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, |
463 | 0 | mBits); |
464 | 0 | } |
465 | |
|
466 | 0 | if (rBits != 0) { |
467 | | /* zero bytes */ |
468 | 0 | if ((hCrcInfo->pCrcLookup) && (rBits > 8)) { |
469 | 0 | rBits -= |
470 | 0 | (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, NULL, rBits >> 3) << 3); |
471 | 0 | } |
472 | | /* remaining zero bits */ |
473 | 0 | if (rBits != 0) { |
474 | 0 | calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, NULL, rBits); |
475 | 0 | } |
476 | 0 | } |
477 | |
|
478 | 0 | hCrcInfo->crcValue = crc; |
479 | 0 | } |