filename | src/gdrom/ecc.h |
changeset | 644:ccae4bfa5f82 |
author | nkeynes |
date | Wed Jul 30 22:50:44 2008 +0000 (15 years ago) |
permissions | -rw-r--r-- |
last change | Bug #61: OpenBSD support (Modified) patch from bsdmaniak, thanks! |
file | annotate | diff | log | raw |
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +00001.2 +++ b/src/gdrom/ecc.h Wed Jul 30 22:50:44 2008 +00001.3 @@ -0,0 +1,136 @@1.4 +/*1.5 + * This file has been modified for the cdrkit suite.1.6 + *1.7 + * The behaviour and appearence of the program code below can differ to a major1.8 + * extent from the version distributed by the original author(s).1.9 + *1.10 + * For details, see Changelog file distributed with the cdrkit package. If you1.11 + * received this file from another source then ask the distributing person for1.12 + * a log of modifications.1.13 + *1.14 + */1.15 +1.16 +/* @(#)ecc.h 1.4 02/10/19 Copyright 1998-2002 Heiko Eissfeldt, Joerg Schilling */1.17 +1.18 +/*1.19 + * compact disc reed-solomon routines1.20 + *1.21 + * (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de1.22 + * (c) 2002 by Joerg Schilling1.23 + */1.24 +/*1.25 + * This program is free software; you can redistribute it and/or modify1.26 + * it under the terms of the GNU General Public License version 21.27 + * as published by the Free Software Foundation.1.28 + *1.29 + * This program is distributed in the hope that it will be useful,1.30 + * but WITHOUT ANY WARRANTY; without even the implied warranty of1.31 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the1.32 + * GNU General Public License for more details.1.33 + *1.34 + * You should have received a copy of the GNU General Public License along with1.35 + * this program; see the file COPYING. If not, write to the Free Software1.36 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.1.37 + */1.38 +1.39 +#define RS_L12_BITS 81.40 +1.41 +/* audio sector definitions for CIRC */1.42 +#define FRAMES_PER_SECTOR 981.43 +/* user data bytes per frame */1.44 +#define L1_RAW 241.45 +/* parity bytes with 8 bit */1.46 +#define L1_Q 41.47 +#define L1_P 41.48 +1.49 +int cd_build_address(unsigned char inout[], int sectortype, unsigned address);1.50 +1.51 +/* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */1.52 +/* adds P- and Q- parity information to audio (f2) frames. Also1.53 + optionally handles the various delays and permutations. The output with all1.54 + stages enabled can be fed into the Eight-Fourteen-Modulator.1.55 + On input: 2352 bytes of audio data is given.1.56 + On output: 3136 bytes of CIRC enriched audio data are returned.1.57 + */1.58 +int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR],1.59 + unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],1.60 + int delay1, int delay2, int delay3, int scramble);1.61 +1.62 +/* data sector definitions for RSPC */1.63 +/* user data bytes per frame */1.64 +#define L2_RAW (1024*2)1.65 +/* parity bytes for 16 bit units */1.66 +#define L2_Q (26*2*2)1.67 +#define L2_P (43*2*2)1.68 +1.69 +/* known sector types */1.70 +#define MODE_0 GDROM_MODE01.71 +#define MODE_1 GDROM_MODE11.72 +#define MODE_2 GDROM_MODE2_FORMLESS1.73 +#define MODE_2_FORM_1 GDROM_MODE2_FORM11.74 +#define MODE_2_FORM_2 GDROM_MODE2_FORM21.75 +1.76 +/* set one of the MODE_* constants for subsequent data sector formatting */1.77 +int set_sector_type(int st);1.78 +/* get the current sector type setting for data sector formatting */1.79 +int get_sector_type(void);1.80 +1.81 +/* data sector layer 2 Reed-Solomon Product Code encoder */1.82 +/* encode the given data portion depending on sector type (see1.83 + get/set_sector_type() functions). Use the given address for the header.1.84 + The returned data is __unscrambled__ and not in F2-frame format (for that1.85 + see function scramble_L2()).1.86 + Supported sector types:1.87 + MODE_0: a 12-byte sync field, a header and 2336 zeros are returned.1.88 + MODE_1: the user data portion (2048 bytes) has to be given1.89 + at offset 16 in the inout array.1.90 + Sync-, header-, edc-, spare-, p- and q- fields will be added.1.91 + MODE_2: the user data portion (2336 bytes) has to be given1.92 + at offset 16 in the inout array.1.93 + Sync- and header- fields will be added.1.94 + MODE_2_FORM_1: the user data portion (8 bytes subheader followed1.95 + by 2048 bytes data) has to be given at offset 161.96 + in the inout array.1.97 + Sync-, header-, edc-, p- and q- fields will be added.1.98 + MODE_2_FORM_2: the user data portion (8 bytes subheader followed1.99 + by 2324 bytes data) has to be given at offset 161.100 + in the inout array.1.101 + Sync-, header- and edc- fields will be added.1.102 +*/1.103 +int do_encode_L2(unsigned char *inout, int sectortype, unsigned address);1.104 +int decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q]);1.105 +int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]);1.106 +unsigned int build_edc(unsigned char inout[], int from, int upto);1.107 +1.108 +/* generates f2 frames from otherwise fully formatted sectors (generated by1.109 + do_encode_L2()). */1.110 +#define EDC_SCRAMBLE_NOSWAP 1 /* Do not swap bytes while scrambling */1.111 +int scramble_L2(unsigned char *inout);1.112 +1.113 +/* r-w sub channel definitions */1.114 +#define RS_SUB_RW_BITS 61.115 +1.116 +#define PACKETS_PER_SUBCHANNELFRAME 41.117 +#define LSUB_RAW 181.118 +#define LSUB_QRAW 21.119 +/* 6 bit */1.120 +#define LSUB_Q 21.121 +#define LSUB_P 41.122 +1.123 +/* R-W subchannel encoder */1.124 +/* On input: 72 bytes packed user data, four frames with each 18 bytes.1.125 + On output: per frame: 2 bytes user data, 2 bytes Q parity,1.126 + 16 bytes user data, 4 bytes P parity.1.127 + Options:1.128 + delay1: use low level delay line1.129 + scramble: perform low level permutations1.130 + */1.131 +int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],1.132 + unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],1.133 + int delay1, int scramble);1.134 +int do_decode_sub(unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],1.135 + unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],1.136 + int delay1, int scramble);1.137 +1.138 +int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q]);1.139 +int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]);
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