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Diffstat (limited to 'fdk-aac/libFDK/src/FDK_crc.cpp')
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diff --git a/fdk-aac/libFDK/src/FDK_crc.cpp b/fdk-aac/libFDK/src/FDK_crc.cpp new file mode 100644 index 0000000..ecbddb1 --- /dev/null +++ b/fdk-aac/libFDK/src/FDK_crc.cpp @@ -0,0 +1,526 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 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 +----------------------------------------------------------------------------- */ + +/******************* Library for basic calculation routines ******************** + + Author(s): + + Description: CRC calculation + +*******************************************************************************/ + +#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}; + +/** + * \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}; + +/** + * \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, +}; + +/** + * \brief This table defines precalculated lookup tables for crc polynom x^16 + * + x^15 + x^5 + x^0. + */ +static const USHORT crcLookup_16_15_5_0[256] = { + 0x0000, 0x8021, 0x8063, 0x0042, 0x80e7, 0x00c6, 0x0084, 0x80a5, 0x81ef, + 0x01ce, 0x018c, 0x81ad, 0x0108, 0x8129, 0x816b, 0x014a, 0x83ff, 0x03de, + 0x039c, 0x83bd, 0x0318, 0x8339, 0x837b, 0x035a, 0x0210, 0x8231, 0x8273, + 0x0252, 0x82f7, 0x02d6, 0x0294, 0x82b5, 0x87df, 0x07fe, 0x07bc, 0x879d, + 0x0738, 0x8719, 0x875b, 0x077a, 0x0630, 0x8611, 0x8653, 0x0672, 0x86d7, + 0x06f6, 0x06b4, 0x8695, 0x0420, 0x8401, 0x8443, 0x0462, 0x84c7, 0x04e6, + 0x04a4, 0x8485, 0x85cf, 0x05ee, 0x05ac, 0x858d, 0x0528, 0x8509, 0x854b, + 0x056a, 0x8f9f, 0x0fbe, 0x0ffc, 0x8fdd, 0x0f78, 0x8f59, 0x8f1b, 0x0f3a, + 0x0e70, 0x8e51, 0x8e13, 0x0e32, 0x8e97, 0x0eb6, 0x0ef4, 0x8ed5, 0x0c60, + 0x8c41, 0x8c03, 0x0c22, 0x8c87, 0x0ca6, 0x0ce4, 0x8cc5, 0x8d8f, 0x0dae, + 0x0dec, 0x8dcd, 0x0d68, 0x8d49, 0x8d0b, 0x0d2a, 0x0840, 0x8861, 0x8823, + 0x0802, 0x88a7, 0x0886, 0x08c4, 0x88e5, 0x89af, 0x098e, 0x09cc, 0x89ed, + 0x0948, 0x8969, 0x892b, 0x090a, 0x8bbf, 0x0b9e, 0x0bdc, 0x8bfd, 0x0b58, + 0x8b79, 0x8b3b, 0x0b1a, 0x0a50, 0x8a71, 0x8a33, 0x0a12, 0x8ab7, 0x0a96, + 0x0ad4, 0x8af5, 0x9f1f, 0x1f3e, 0x1f7c, 0x9f5d, 0x1ff8, 0x9fd9, 0x9f9b, + 0x1fba, 0x1ef0, 0x9ed1, 0x9e93, 0x1eb2, 0x9e17, 0x1e36, 0x1e74, 0x9e55, + 0x1ce0, 0x9cc1, 0x9c83, 0x1ca2, 0x9c07, 0x1c26, 0x1c64, 0x9c45, 0x9d0f, + 0x1d2e, 0x1d6c, 0x9d4d, 0x1de8, 0x9dc9, 0x9d8b, 0x1daa, 0x18c0, 0x98e1, + 0x98a3, 0x1882, 0x9827, 0x1806, 0x1844, 0x9865, 0x992f, 0x190e, 0x194c, + 0x996d, 0x19c8, 0x99e9, 0x99ab, 0x198a, 0x9b3f, 0x1b1e, 0x1b5c, 0x9b7d, + 0x1bd8, 0x9bf9, 0x9bbb, 0x1b9a, 0x1ad0, 0x9af1, 0x9ab3, 0x1a92, 0x9a37, + 0x1a16, 0x1a54, 0x9a75, 0x1080, 0x90a1, 0x90e3, 0x10c2, 0x9067, 0x1046, + 0x1004, 0x9025, 0x916f, 0x114e, 0x110c, 0x912d, 0x1188, 0x91a9, 0x91eb, + 0x11ca, 0x937f, 0x135e, 0x131c, 0x933d, 0x1398, 0x93b9, 0x93fb, 0x13da, + 0x1290, 0x92b1, 0x92f3, 0x12d2, 0x9277, 0x1256, 0x1214, 0x9235, 0x975f, + 0x177e, 0x173c, 0x971d, 0x17b8, 0x9799, 0x97db, 0x17fa, 0x16b0, 0x9691, + 0x96d3, 0x16f2, 0x9657, 0x1676, 0x1634, 0x9615, 0x14a0, 0x9481, 0x94c3, + 0x14e2, 0x9447, 0x1466, 0x1424, 0x9405, 0x954f, 0x156e, 0x152c, 0x950d, + 0x15a8, 0x9589, 0x95cb, 0x15ea, +}; + +/*--------------- 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^5 + x^0 (1) 1000 0000 0010 0001 -> 0x8021 + 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; /* Preset 0 for "crcLen" != 16 or unknown 16-bit polynoms "crcPoly" */ + + if (hCrcInfo->crcLen == 16) { + switch (crcPoly) { + case 0x8021: + hCrcInfo->pCrcLookup = crcLookup_16_15_5_0; + break; + 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 */ + break; + } + } +} + +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 = (INT)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 = + (INT)FDKgetValidBits(hBs) - hCrcInfo->crcRegData[reg].validBits; + } else { + hCrcInfo->crcRegData[reg].bitBufCntBits = + hCrcInfo->crcRegData[reg].validBits - (INT)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 = FDKreadBit(hBs); // process single bit + tmp ^= ((crc & crcMask) ? 1 : 0); + if (tmp != 0) tmp = crcPoly; + crc <<= 1; + crc ^= tmp; + } + } else { + for (i = 0; (i < nBits); i++) { + USHORT tmp = (crc & crcMask) ? crcPoly : 0; // process single bit + 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) { + ULONG data; + INT bits; + for (i = 0; i < (nBytes >> 2); i++) { + data = (ULONG)FDKreadBits(hBs, 32); + crc = + (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 24))) & 0xFF]; + crc = + (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 16))) & 0xFF]; + crc = + (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 8))) & 0xFF]; + crc = + (crc << 8) ^ pCrcLookup[((crc >> 8) ^ ((USHORT)(data >> 0))) & 0xFF]; + } + bits = (nBytes & 3) << 3; + if (bits > 0) { + data = (ULONG)FDKreadBits(hBs, bits); + for (bits -= 8; bits >= 0; bits -= 8) + crc = (crc << 8) ^ + pCrcLookup[((crc >> 8) ^ (USHORT)(data >> bits)) & 0xFF]; + } + } else { + for (i = 0; i < nBytes; i++) { + crc = (crc << 8) ^ pCrcLookup[(crc >> 8) & 0xFF]; + } + } + + *pCrc = crc; /* update crc value */ + //fprintf(stderr, "\n\n crc[%d]=%04x\n", i, crc); + + return (nBytes); +} + +/** + * \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, + -(rD->validBits - (INT)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; /* ramaining bits */ + if ((rD->maxBits > 0) && ((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) { + calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, NULL, rBits); + } + } + + //fprintf(stderr, "\n\n crc=%04x\n", crc); + hCrcInfo->crcValue = crc; +} |