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Diffstat (limited to 'libFDK/src/FDK_crc.cpp')
| -rw-r--r-- | libFDK/src/FDK_crc.cpp | 543 |
1 files changed, 0 insertions, 543 deletions
diff --git a/libFDK/src/FDK_crc.cpp b/libFDK/src/FDK_crc.cpp deleted file mode 100644 index a4c6900..0000000 --- a/libFDK/src/FDK_crc.cpp +++ /dev/null @@ -1,543 +0,0 @@ - -/* ----------------------------------------------------------------------------------------------------------- -Software License for The Fraunhofer FDK AAC Codec Library for Android - -© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. - All rights reserved. - - 1. INTRODUCTION -The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements -the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. -This FDK AAC Codec software is intended to be used on a wide variety of Android devices. - -AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual -audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by -independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part -of the MPEG specifications. - -Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) -may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners -individually for the purpose of encoding or decoding bit streams in products that are compliant with -the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license -these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec -software may already be covered under those patent licenses when it is used for those licensed purposes only. - -Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, -are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional -applications information and documentation. - -2. COPYRIGHT LICENSE - -Redistribution and use in source and binary forms, with or without modification, are permitted without -payment of copyright license fees provided that you satisfy the following conditions: - -You must retain the complete text of this software license in redistributions of the FDK AAC Codec or -your modifications thereto in source code form. - -You must retain the complete text of this software license in the documentation and/or other materials -provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. -You must make available free of charge copies of the complete source code of the FDK AAC Codec and your -modifications thereto to recipients of copies in binary form. - -The name of Fraunhofer may not be used to endorse or promote products derived from this library without -prior written permission. - -You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec -software or your modifications thereto. - -Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software -and the date of any change. For modified versions of the FDK AAC Codec, the term -"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term -"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." - -3. NO PATENT LICENSE - -NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, -ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with -respect to this software. - -You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized -by appropriate patent licenses. - -4. DISCLAIMER - -This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors -"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties -of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR -CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, -including but not limited to procurement of substitute goods or services; loss of use, data, or profits, -or business interruption, however caused and on any theory of liability, whether in contract, strict -liability, or tort (including negligence), arising in any way out of the use of this software, even if -advised of the possibility of such damage. - -5. CONTACT INFORMATION - -Fraunhofer Institute for Integrated Circuits IIS -Attention: Audio and Multimedia Departments - FDK AAC LL -Am Wolfsmantel 33 -91058 Erlangen, Germany - -www.iis.fraunhofer.de/amm -amm-info@iis.fraunhofer.de ------------------------------------------------------------------------------------------------------------ */ - -/******************************** MPEG Audio Encoder ************************** - - Initial author: - contents/description: CRC calculation - -******************************************************************************/ -#include <stdio.h> -#include "FDK_crc.h" - - - -/*---------------- constants -----------------------*/ - -/** - * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^15 + x^2 + x^0. - */ -static const USHORT crcLookup_16_15_2_0[256] = -{ - 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011, - 0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022, - 0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072, - 0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041, - 0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2, - 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1, - 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1, - 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082, - 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192, - 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1, - 0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1, - 0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2, - 0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151, - 0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162, - 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132, - 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101, - 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312, - 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321, - 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371, - 0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342, - 0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1, - 0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2, - 0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2, - 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381, - 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291, - 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2, - 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2, - 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1, - 0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252, - 0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261, - 0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231, - 0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202 -}; -#if 1 -/** - * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^12 + x^5 + x^0. - */ -static const USHORT crcLookup_16_12_5_0[256] = -{ - 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, - 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, - 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, - 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, - 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, - 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, - 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, - 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, - 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, - 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, - 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, - 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, - 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, - 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, - 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, - 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, - 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, - 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, - 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, - 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, - 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, - 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, - 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, - 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, - 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, - 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, - 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, - 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, - 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, - 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, - 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, - 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 -}; -#else -static const USHORT crcLookup_16_12_5_0[256] = -{ - 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, - 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, - 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, - 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, - 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, - 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, - 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, - 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, - 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, - 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, - 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, - 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, - 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, - 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, - 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, - 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, - 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, - 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, - 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, - 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, - 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, - 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, - 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, - 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, - 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, - 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, - 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, - 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, - 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, - 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, - 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, - 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 -}; -#endif - - -/** - * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^14 + x^13 + x^12 + x^11 + x^5 + x^3 + x^2 + x^0. - */ -static const USHORT crcLookup_16_14_13_12_11_5_3_2_0[256] = -{ - 0x0000, 0x782f, 0xf05e, 0x8871, 0x9893, 0xe0bc, 0x68cd, 0x10e2, - 0x4909, 0x3126, 0xb957, 0xc178, 0xd19a, 0xa9b5, 0x21c4, 0x59eb, - 0x9212, 0xea3d, 0x624c, 0x1a63, 0x0a81, 0x72ae, 0xfadf, 0x82f0, - 0xdb1b, 0xa334, 0x2b45, 0x536a, 0x4388, 0x3ba7, 0xb3d6, 0xcbf9, - 0x5c0b, 0x2424, 0xac55, 0xd47a, 0xc498, 0xbcb7, 0x34c6, 0x4ce9, - 0x1502, 0x6d2d, 0xe55c, 0x9d73, 0x8d91, 0xf5be, 0x7dcf, 0x05e0, - 0xce19, 0xb636, 0x3e47, 0x4668, 0x568a, 0x2ea5, 0xa6d4, 0xdefb, - 0x8710, 0xff3f, 0x774e, 0x0f61, 0x1f83, 0x67ac, 0xefdd, 0x97f2, - 0xb816, 0xc039, 0x4848, 0x3067, 0x2085, 0x58aa, 0xd0db, 0xa8f4, - 0xf11f, 0x8930, 0x0141, 0x796e, 0x698c, 0x11a3, 0x99d2, 0xe1fd, - 0x2a04, 0x522b, 0xda5a, 0xa275, 0xb297, 0xcab8, 0x42c9, 0x3ae6, - 0x630d, 0x1b22, 0x9353, 0xeb7c, 0xfb9e, 0x83b1, 0x0bc0, 0x73ef, - 0xe41d, 0x9c32, 0x1443, 0x6c6c, 0x7c8e, 0x04a1, 0x8cd0, 0xf4ff, - 0xad14, 0xd53b, 0x5d4a, 0x2565, 0x3587, 0x4da8, 0xc5d9, 0xbdf6, - 0x760f, 0x0e20, 0x8651, 0xfe7e, 0xee9c, 0x96b3, 0x1ec2, 0x66ed, - 0x3f06, 0x4729, 0xcf58, 0xb777, 0xa795, 0xdfba, 0x57cb, 0x2fe4, - 0x0803, 0x702c, 0xf85d, 0x8072, 0x9090, 0xe8bf, 0x60ce, 0x18e1, - 0x410a, 0x3925, 0xb154, 0xc97b, 0xd999, 0xa1b6, 0x29c7, 0x51e8, - 0x9a11, 0xe23e, 0x6a4f, 0x1260, 0x0282, 0x7aad, 0xf2dc, 0x8af3, - 0xd318, 0xab37, 0x2346, 0x5b69, 0x4b8b, 0x33a4, 0xbbd5, 0xc3fa, - 0x5408, 0x2c27, 0xa456, 0xdc79, 0xcc9b, 0xb4b4, 0x3cc5, 0x44ea, - 0x1d01, 0x652e, 0xed5f, 0x9570, 0x8592, 0xfdbd, 0x75cc, 0x0de3, - 0xc61a, 0xbe35, 0x3644, 0x4e6b, 0x5e89, 0x26a6, 0xaed7, 0xd6f8, - 0x8f13, 0xf73c, 0x7f4d, 0x0762, 0x1780, 0x6faf, 0xe7de, 0x9ff1, - 0xb015, 0xc83a, 0x404b, 0x3864, 0x2886, 0x50a9, 0xd8d8, 0xa0f7, - 0xf91c, 0x8133, 0x0942, 0x716d, 0x618f, 0x19a0, 0x91d1, 0xe9fe, - 0x2207, 0x5a28, 0xd259, 0xaa76, 0xba94, 0xc2bb, 0x4aca, 0x32e5, - 0x6b0e, 0x1321, 0x9b50, 0xe37f, 0xf39d, 0x8bb2, 0x03c3, 0x7bec, - 0xec1e, 0x9431, 0x1c40, 0x646f, 0x748d, 0x0ca2, 0x84d3, 0xfcfc, - 0xa517, 0xdd38, 0x5549, 0x2d66, 0x3d84, 0x45ab, 0xcdda, 0xb5f5, - 0x7e0c, 0x0623, 0x8e52, 0xf67d, 0xe69f, 0x9eb0, 0x16c1, 0x6eee, - 0x3705, 0x4f2a, 0xc75b, 0xbf74, 0xaf96, 0xd7b9, 0x5fc8, 0x27e7, -}; - -/*--------------- function declarations --------------------*/ - -static inline INT calcCrc_Bits( - USHORT * const pCrc, - USHORT crcMask, - USHORT crcPoly, - HANDLE_FDK_BITSTREAM hBs, - INT nBits - ); - -static inline INT calcCrc_Bytes( - USHORT * const pCrc, - const USHORT * pCrcLookup, - HANDLE_FDK_BITSTREAM hBs, - INT nBytes - ); - -static void crcCalc( - HANDLE_FDK_CRCINFO hCrcInfo, - HANDLE_FDK_BITSTREAM hBs, - const INT reg - ); - - -/*------------- function definitions ----------------*/ - -void FDKcrcInit( - HANDLE_FDK_CRCINFO hCrcInfo, - const UINT crcPoly, - const UINT crcStartValue, - const UINT crcLen - ) -{ - /* crc polynom example: - DAB+ FireCode: - x^16 + x^14 + x^13 + x^12 + x^11 + x^5 + x^3 + x^2 + x^0 - (1) 0111 1000 0010 1101 -> 0x782d - - x^16 + x^15 + x^2 + x^0 (1) 1000 0000 0000 0101 -> 0x8005 - x^16 + x^12 + x^5 + x^0 (1) 0001 0000 0010 0001 -> 0x1021 - x^8 + x^4 + x^3 + x^2 + x^0 (1) 0001 1101 -> 0x001d */ - - hCrcInfo->crcLen = crcLen; - hCrcInfo->crcPoly = crcPoly; - hCrcInfo->startValue = crcStartValue; - hCrcInfo->crcMask = (crcLen) ? (1<<(crcLen-1)) : 0; - - FDKcrcReset(hCrcInfo); - - hCrcInfo->pCrcLookup = 0; - - if (hCrcInfo->crcLen==16) { - switch ( crcPoly ) { - case 0x8005: - hCrcInfo->pCrcLookup = crcLookup_16_15_2_0; - break; - case 0x1021: - hCrcInfo->pCrcLookup = crcLookup_16_12_5_0; - break; - case 0x782d: - hCrcInfo->pCrcLookup = crcLookup_16_14_13_12_11_5_3_2_0; - break; - case 0x001d: - default: - /* no lookup table */ - hCrcInfo->pCrcLookup = 0; - } - } - - -} - -void FDKcrcReset(HANDLE_FDK_CRCINFO hCrcInfo) -{ - int i; - - hCrcInfo->crcValue = hCrcInfo->startValue; - - for(i=0;i<MAX_CRC_REGS;i++) { - hCrcInfo->crcRegData[i].isActive = 0; - } - hCrcInfo->regStart = 0; - hCrcInfo->regStop = 0; -} - -INT FDKcrcStartReg( - HANDLE_FDK_CRCINFO hCrcInfo, - const HANDLE_FDK_BITSTREAM hBs, - const INT mBits - ) -{ - int reg = hCrcInfo->regStart; - - FDK_ASSERT(hCrcInfo->crcRegData[reg].isActive==0); - hCrcInfo->crcRegData[reg].isActive = 1; - hCrcInfo->crcRegData[reg].maxBits = mBits; - hCrcInfo->crcRegData[reg].validBits = FDKgetValidBits(hBs) ; - hCrcInfo->crcRegData[reg].bitBufCntBits = 0; - - hCrcInfo->regStart = (hCrcInfo->regStart+1)%MAX_CRC_REGS; - - return (reg); -} - -INT FDKcrcEndReg( - HANDLE_FDK_CRCINFO hCrcInfo, - const HANDLE_FDK_BITSTREAM hBs, - const INT reg - ) -{ - FDK_ASSERT((reg==(INT)hCrcInfo->regStop)&&(hCrcInfo->crcRegData[reg].isActive==1)); - - if (hBs->ConfigCache==BS_WRITER) { - hCrcInfo->crcRegData[reg].bitBufCntBits = FDKgetValidBits(hBs) - hCrcInfo->crcRegData[reg].validBits; - } - else { - hCrcInfo->crcRegData[reg].bitBufCntBits = hCrcInfo->crcRegData[reg].validBits - FDKgetValidBits(hBs); - } - - if (hCrcInfo->crcRegData[reg].maxBits == 0) { - hCrcInfo->crcRegData[reg].maxBits = hCrcInfo->crcRegData[reg].bitBufCntBits; - } - - crcCalc( hCrcInfo, hBs, reg); - - hCrcInfo->crcRegData[reg].isActive = 0; - hCrcInfo->regStop = (hCrcInfo->regStop+1)%MAX_CRC_REGS; - - return 0; -} - -USHORT FDKcrcGetCRC( - const HANDLE_FDK_CRCINFO hCrcInfo - ) -{ - return ( hCrcInfo->crcValue & (((hCrcInfo->crcMask-1)<<1)+1) ); -} - -/** - * \brief Calculate crc bits. - * - * Calculate crc starting at current bitstream postion over nBits. - * - * \param pCrc Pointer to an outlying allocated crc info structure. - * \param crcMask CrcMask in use. - * \param crcPoly Crc polynom in use. - * \param hBs Handle to current bit buffer structure. - * \param nBits Number of processing bits. - * - * \return Number of processed bits. - */ -static inline INT calcCrc_Bits( - USHORT * const pCrc, - USHORT crcMask, - USHORT crcPoly, - HANDLE_FDK_BITSTREAM hBs, - INT nBits - ) -{ - int i; - USHORT crc = *pCrc; /* get crc value */ - - if (hBs!=NULL) { - for (i = 0; (i < nBits); i++) { - USHORT tmp = FDKreadBits(hBs,1); // process single bit - tmp ^= ( (crc & crcMask) ? 1 : 0 ); - tmp *= crcPoly; - crc <<= 1; - crc ^= tmp; - } - } - else { - for (i = 0; (i < nBits); i++) { - USHORT tmp = 0; // process single bit - tmp ^= ( (crc & crcMask) ? 1 : 0 ); - tmp *= crcPoly; - crc <<= 1; - crc ^= tmp; - } - } - *pCrc = crc; /* update crc value */ - - return nBits; -} - -/** - * \brief Calculate crc bytes. - * - * Calculate crc starting at current bitstream postion over nBytes. - * - * \param pCrc Pointer to an outlying allocated crc info structure. - * \param pCrcLookup Pointer to lookup table used for fast crc calculation. - * \param hBs Handle to current bit buffer structure. - * \param nBits Number of processing bytes. - * - * \return Number of processed bits. - */ -static inline INT calcCrc_Bytes( - USHORT * const pCrc, - const USHORT * pCrcLookup, - HANDLE_FDK_BITSTREAM hBs, - INT nBytes - ) -{ - int i; - USHORT crc = *pCrc; /* get crc value */ - if (hBs!=NULL) { - for (i=0; i<nBytes; i++) { - crc = (crc<<8)^pCrcLookup[((crc>>8)^(FDKreadBits(hBs,8)))&0xFF]; - } - } - else { - for (i=0; i<nBytes; i++) { - crc = (crc<<8)^pCrcLookup[((crc>>8)^((UCHAR)0))&0xFF]; - } - } - - *pCrc = crc; /* update crc value */ - //fprintf(stderr, "\n\n crc[%d]=%04x\n", i, crc); - - return (i); -} - -/** - * \brief Calculate crc. - * - * Calculate crc. Lenght depends on mBits parameter in FDKcrcStartReg() configuration. - * - * \param hCrcInfo Pointer to an outlying allocated crc info structure. - * \param hBs Pointer to current bit buffer structure. - * \param reg Crc region ID. - * - * \return Number of processed bits. - */ -static void crcCalc( - HANDLE_FDK_CRCINFO hCrcInfo, - HANDLE_FDK_BITSTREAM hBs, - const INT reg - ) -{ - USHORT crc = hCrcInfo->crcValue; - CCrcRegData *rD = &hCrcInfo->crcRegData[reg]; - FDK_BITSTREAM bsReader; - - if (hBs->ConfigCache==BS_READER) { - bsReader = *hBs; - FDKpushBiDirectional(&bsReader, -(INT)(rD->validBits-FDKgetValidBits(&bsReader))); - } - else { - FDKinitBitStream(&bsReader, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, hBs->hBitBuf.ValidBits, BS_READER); - FDKpushBiDirectional(&bsReader, rD->validBits); - } - - int bits, rBits; - rBits = (rD->maxBits>=0) ? rD->maxBits : -rD->maxBits; /* remaining bits */ - if ((rD->maxBits>0) && (((INT)rD->bitBufCntBits>>3<<3)<rBits) ) { - bits = rD->bitBufCntBits; - } - else { - bits = rBits; - } - - int words = bits >> 3; /* processing bytes */ - int mBits = bits & 0x7; /* modulo bits */ - - if(hCrcInfo->pCrcLookup) { - rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, &bsReader, words)<<3); - } - else { - rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, words<<3 ); - } - - /* remaining valid bits*/ - if(mBits!=0) { - rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, mBits ); - } - - if (rBits!=0) { - /* zero bytes */ - if ( (hCrcInfo->pCrcLookup) && (rBits>8) ) { - rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, NULL, rBits>>3)<<3); - } - /* remaining zero bits */ - if (rBits!=0) { - rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, NULL, rBits ); - } - } - - //fprintf(stderr, "\n\n crc=%04x\n", crc); - hCrcInfo->crcValue = crc; -} - |