nkeynes@644 | 1 | /*
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nkeynes@644 | 2 | * This file has been modified for the cdrkit suite.
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nkeynes@644 | 3 | *
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nkeynes@644 | 4 | * The behaviour and appearence of the program code below can differ to a major
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nkeynes@644 | 5 | * extent from the version distributed by the original author(s).
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nkeynes@644 | 6 | *
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nkeynes@644 | 7 | * For details, see Changelog file distributed with the cdrkit package. If you
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nkeynes@644 | 8 | * received this file from another source then ask the distributing person for
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nkeynes@644 | 9 | * a log of modifications.
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nkeynes@644 | 10 | *
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nkeynes@644 | 11 | */
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nkeynes@644 | 12 |
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nkeynes@644 | 13 | /* @(#)ecc.h 1.4 02/10/19 Copyright 1998-2002 Heiko Eissfeldt, Joerg Schilling */
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nkeynes@644 | 14 |
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nkeynes@644 | 15 | /*
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nkeynes@644 | 16 | * compact disc reed-solomon routines
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nkeynes@644 | 17 | *
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nkeynes@644 | 18 | * (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de
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nkeynes@644 | 19 | * (c) 2002 by Joerg Schilling
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nkeynes@644 | 20 | */
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nkeynes@644 | 21 | /*
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nkeynes@644 | 22 | * This program is free software; you can redistribute it and/or modify
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nkeynes@644 | 23 | * it under the terms of the GNU General Public License version 2
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nkeynes@644 | 24 | * as published by the Free Software Foundation.
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nkeynes@644 | 25 | *
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nkeynes@644 | 26 | * This program is distributed in the hope that it will be useful,
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nkeynes@644 | 27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@644 | 28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@644 | 29 | * GNU General Public License for more details.
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nkeynes@644 | 30 | *
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nkeynes@644 | 31 | * You should have received a copy of the GNU General Public License along with
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nkeynes@644 | 32 | * this program; see the file COPYING. If not, write to the Free Software
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nkeynes@644 | 33 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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nkeynes@644 | 34 | */
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nkeynes@644 | 35 |
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nkeynes@644 | 36 | #define RS_L12_BITS 8
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nkeynes@644 | 37 |
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nkeynes@644 | 38 | /* audio sector definitions for CIRC */
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nkeynes@644 | 39 | #define FRAMES_PER_SECTOR 98
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nkeynes@644 | 40 | /* user data bytes per frame */
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nkeynes@644 | 41 | #define L1_RAW 24
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nkeynes@644 | 42 | /* parity bytes with 8 bit */
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nkeynes@644 | 43 | #define L1_Q 4
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nkeynes@644 | 44 | #define L1_P 4
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nkeynes@644 | 45 |
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nkeynes@644 | 46 | int cd_build_address(unsigned char inout[], int sectortype, unsigned address);
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nkeynes@644 | 47 |
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nkeynes@644 | 48 | /* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */
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nkeynes@644 | 49 | /* adds P- and Q- parity information to audio (f2) frames. Also
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nkeynes@644 | 50 | optionally handles the various delays and permutations. The output with all
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nkeynes@644 | 51 | stages enabled can be fed into the Eight-Fourteen-Modulator.
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nkeynes@644 | 52 | On input: 2352 bytes of audio data is given.
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nkeynes@644 | 53 | On output: 3136 bytes of CIRC enriched audio data are returned.
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nkeynes@644 | 54 | */
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nkeynes@644 | 55 | int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR],
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nkeynes@644 | 56 | unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
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nkeynes@644 | 57 | int delay1, int delay2, int delay3, int scramble);
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nkeynes@644 | 58 |
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nkeynes@644 | 59 | /* data sector definitions for RSPC */
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nkeynes@644 | 60 | /* user data bytes per frame */
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nkeynes@644 | 61 | #define L2_RAW (1024*2)
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nkeynes@644 | 62 | /* parity bytes for 16 bit units */
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nkeynes@644 | 63 | #define L2_Q (26*2*2)
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nkeynes@644 | 64 | #define L2_P (43*2*2)
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nkeynes@644 | 65 |
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nkeynes@644 | 66 | /* known sector types */
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nkeynes@1097 | 67 | #define MODE_0 SECTOR_UNKNOWN
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nkeynes@1097 | 68 | #define MODE_1 SECTOR_MODE1
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nkeynes@1097 | 69 | #define MODE_2 SECTOR_MODE2_FORMLESS
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nkeynes@1097 | 70 | #define MODE_2_FORM_1 SECTOR_MODE2_FORM1
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nkeynes@1097 | 71 | #define MODE_2_FORM_2 SECTOR_MODE2_FORM2
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nkeynes@644 | 72 |
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nkeynes@644 | 73 | /* set one of the MODE_* constants for subsequent data sector formatting */
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nkeynes@644 | 74 | int set_sector_type(int st);
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nkeynes@644 | 75 | /* get the current sector type setting for data sector formatting */
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nkeynes@644 | 76 | int get_sector_type(void);
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nkeynes@644 | 77 |
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nkeynes@644 | 78 | /* data sector layer 2 Reed-Solomon Product Code encoder */
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nkeynes@644 | 79 | /* encode the given data portion depending on sector type (see
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nkeynes@644 | 80 | get/set_sector_type() functions). Use the given address for the header.
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nkeynes@644 | 81 | The returned data is __unscrambled__ and not in F2-frame format (for that
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nkeynes@644 | 82 | see function scramble_L2()).
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nkeynes@644 | 83 | Supported sector types:
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nkeynes@644 | 84 | MODE_0: a 12-byte sync field, a header and 2336 zeros are returned.
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nkeynes@644 | 85 | MODE_1: the user data portion (2048 bytes) has to be given
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nkeynes@644 | 86 | at offset 16 in the inout array.
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nkeynes@644 | 87 | Sync-, header-, edc-, spare-, p- and q- fields will be added.
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nkeynes@644 | 88 | MODE_2: the user data portion (2336 bytes) has to be given
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nkeynes@644 | 89 | at offset 16 in the inout array.
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nkeynes@644 | 90 | Sync- and header- fields will be added.
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nkeynes@644 | 91 | MODE_2_FORM_1: the user data portion (8 bytes subheader followed
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nkeynes@644 | 92 | by 2048 bytes data) has to be given at offset 16
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nkeynes@644 | 93 | in the inout array.
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nkeynes@644 | 94 | Sync-, header-, edc-, p- and q- fields will be added.
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nkeynes@644 | 95 | MODE_2_FORM_2: the user data portion (8 bytes subheader followed
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nkeynes@644 | 96 | by 2324 bytes data) has to be given at offset 16
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nkeynes@644 | 97 | in the inout array.
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nkeynes@644 | 98 | Sync-, header- and edc- fields will be added.
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nkeynes@644 | 99 | */
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nkeynes@644 | 100 | int do_encode_L2(unsigned char *inout, int sectortype, unsigned address);
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nkeynes@644 | 101 | int decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q]);
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nkeynes@644 | 102 | int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]);
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nkeynes@644 | 103 | unsigned int build_edc(unsigned char inout[], int from, int upto);
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nkeynes@644 | 104 |
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nkeynes@644 | 105 | /* generates f2 frames from otherwise fully formatted sectors (generated by
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nkeynes@644 | 106 | do_encode_L2()). */
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nkeynes@644 | 107 | #define EDC_SCRAMBLE_NOSWAP 1 /* Do not swap bytes while scrambling */
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nkeynes@644 | 108 | int scramble_L2(unsigned char *inout);
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nkeynes@644 | 109 |
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nkeynes@644 | 110 | /* r-w sub channel definitions */
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nkeynes@644 | 111 | #define RS_SUB_RW_BITS 6
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nkeynes@644 | 112 |
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nkeynes@644 | 113 | #define PACKETS_PER_SUBCHANNELFRAME 4
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nkeynes@644 | 114 | #define LSUB_RAW 18
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nkeynes@644 | 115 | #define LSUB_QRAW 2
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nkeynes@644 | 116 | /* 6 bit */
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nkeynes@644 | 117 | #define LSUB_Q 2
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nkeynes@644 | 118 | #define LSUB_P 4
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nkeynes@644 | 119 |
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nkeynes@644 | 120 | /* R-W subchannel encoder */
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nkeynes@644 | 121 | /* On input: 72 bytes packed user data, four frames with each 18 bytes.
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nkeynes@644 | 122 | On output: per frame: 2 bytes user data, 2 bytes Q parity,
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nkeynes@644 | 123 | 16 bytes user data, 4 bytes P parity.
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nkeynes@644 | 124 | Options:
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nkeynes@644 | 125 | delay1: use low level delay line
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nkeynes@644 | 126 | scramble: perform low level permutations
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nkeynes@644 | 127 | */
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nkeynes@644 | 128 | int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
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nkeynes@644 | 129 | unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
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nkeynes@644 | 130 | int delay1, int scramble);
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nkeynes@644 | 131 | int do_decode_sub(unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
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nkeynes@644 | 132 | unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
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nkeynes@644 | 133 | int delay1, int scramble);
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nkeynes@644 | 134 |
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nkeynes@644 | 135 | int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q]);
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nkeynes@644 | 136 | int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]);
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