Search
lxdream.org :: lxdream/src/gdrom/ecc.h :: diff
lxdream 0.9.1
released Jun 29
Download Now
filename src/gdrom/ecc.h
changeset 644:ccae4bfa5f82
author nkeynes
date Sun Mar 02 11:38:08 2008 +0000 (12 years ago)
permissions -rw-r--r--
last change Bug #59: Add provisional support for all CD read modes (not validated)
file annotate diff log raw
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/gdrom/ecc.h Sun Mar 02 11:38:08 2008 +0000
1.3 @@ -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 major
1.8 + * 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 you
1.11 + * received this file from another source then ask the distributing person for
1.12 + * 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 routines
1.20 + *
1.21 + * (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de
1.22 + * (c) 2002 by Joerg Schilling
1.23 + */
1.24 +/*
1.25 + * This program is free software; you can redistribute it and/or modify
1.26 + * it under the terms of the GNU General Public License version 2
1.27 + * 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 of
1.31 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.32 + * GNU General Public License for more details.
1.33 + *
1.34 + * You should have received a copy of the GNU General Public License along with
1.35 + * this program; see the file COPYING. If not, write to the Free Software
1.36 + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
1.37 + */
1.38 +
1.39 +#define RS_L12_BITS 8
1.40 +
1.41 +/* audio sector definitions for CIRC */
1.42 +#define FRAMES_PER_SECTOR 98
1.43 +/* user data bytes per frame */
1.44 +#define L1_RAW 24
1.45 +/* parity bytes with 8 bit */
1.46 +#define L1_Q 4
1.47 +#define L1_P 4
1.48 +
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. Also
1.53 + optionally handles the various delays and permutations. The output with all
1.54 + 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_MODE0
1.71 +#define MODE_1 GDROM_MODE1
1.72 +#define MODE_2 GDROM_MODE2_FORMLESS
1.73 +#define MODE_2_FORM_1 GDROM_MODE2_FORM1
1.74 +#define MODE_2_FORM_2 GDROM_MODE2_FORM2
1.75 +
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 (see
1.83 + 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 that
1.85 + 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 given
1.89 + 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 given
1.92 + 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 followed
1.95 + by 2048 bytes data) has to be given at offset 16
1.96 + 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 followed
1.99 + by 2324 bytes data) has to be given at offset 16
1.100 + 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 by
1.109 + 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 6
1.115 +
1.116 +#define PACKETS_PER_SUBCHANNELFRAME 4
1.117 +#define LSUB_RAW 18
1.118 +#define LSUB_QRAW 2
1.119 +/* 6 bit */
1.120 +#define LSUB_Q 2
1.121 +#define LSUB_P 4
1.122 +
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 line
1.129 + scramble: perform low level permutations
1.130 + */
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]);
.