lxdream 0.9.1| filename | src/gdrom/ecc.h |
| changeset | 644:ccae4bfa5f82 |
| author | nkeynes |
| date | Thu May 29 11:00:26 2008 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Split gdrom.h into public and private gddriver.h Reorganize gdrom mount to use a disc change hook |
| view | annotate | diff | log | raw |
1 /*
2 * This file has been modified for the cdrkit suite.
3 *
4 * The behaviour and appearence of the program code below can differ to a major
5 * extent from the version distributed by the original author(s).
6 *
7 * For details, see Changelog file distributed with the cdrkit package. If you
8 * received this file from another source then ask the distributing person for
9 * a log of modifications.
10 *
11 */
13 /* @(#)ecc.h 1.4 02/10/19 Copyright 1998-2002 Heiko Eissfeldt, Joerg Schilling */
15 /*
16 * compact disc reed-solomon routines
17 *
18 * (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de
19 * (c) 2002 by Joerg Schilling
20 */
21 /*
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License version 2
24 * as published by the Free Software Foundation.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License along with
32 * this program; see the file COPYING. If not, write to the Free Software
33 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 */
36 #define RS_L12_BITS 8
38 /* audio sector definitions for CIRC */
39 #define FRAMES_PER_SECTOR 98
40 /* user data bytes per frame */
41 #define L1_RAW 24
42 /* parity bytes with 8 bit */
43 #define L1_Q 4
44 #define L1_P 4
46 int cd_build_address(unsigned char inout[], int sectortype, unsigned address);
48 /* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */
49 /* adds P- and Q- parity information to audio (f2) frames. Also
50 optionally handles the various delays and permutations. The output with all
51 stages enabled can be fed into the Eight-Fourteen-Modulator.
52 On input: 2352 bytes of audio data is given.
53 On output: 3136 bytes of CIRC enriched audio data are returned.
54 */
55 int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR],
56 unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
57 int delay1, int delay2, int delay3, int scramble);
59 /* data sector definitions for RSPC */
60 /* user data bytes per frame */
61 #define L2_RAW (1024*2)
62 /* parity bytes for 16 bit units */
63 #define L2_Q (26*2*2)
64 #define L2_P (43*2*2)
66 /* known sector types */
67 #define MODE_0 GDROM_MODE0
68 #define MODE_1 GDROM_MODE1
69 #define MODE_2 GDROM_MODE2_FORMLESS
70 #define MODE_2_FORM_1 GDROM_MODE2_FORM1
71 #define MODE_2_FORM_2 GDROM_MODE2_FORM2
73 /* set one of the MODE_* constants for subsequent data sector formatting */
74 int set_sector_type(int st);
75 /* get the current sector type setting for data sector formatting */
76 int get_sector_type(void);
78 /* data sector layer 2 Reed-Solomon Product Code encoder */
79 /* encode the given data portion depending on sector type (see
80 get/set_sector_type() functions). Use the given address for the header.
81 The returned data is __unscrambled__ and not in F2-frame format (for that
82 see function scramble_L2()).
83 Supported sector types:
84 MODE_0: a 12-byte sync field, a header and 2336 zeros are returned.
85 MODE_1: the user data portion (2048 bytes) has to be given
86 at offset 16 in the inout array.
87 Sync-, header-, edc-, spare-, p- and q- fields will be added.
88 MODE_2: the user data portion (2336 bytes) has to be given
89 at offset 16 in the inout array.
90 Sync- and header- fields will be added.
91 MODE_2_FORM_1: the user data portion (8 bytes subheader followed
92 by 2048 bytes data) has to be given at offset 16
93 in the inout array.
94 Sync-, header-, edc-, p- and q- fields will be added.
95 MODE_2_FORM_2: the user data portion (8 bytes subheader followed
96 by 2324 bytes data) has to be given at offset 16
97 in the inout array.
98 Sync-, header- and edc- fields will be added.
99 */
100 int do_encode_L2(unsigned char *inout, int sectortype, unsigned address);
101 int decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q]);
102 int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]);
103 unsigned int build_edc(unsigned char inout[], int from, int upto);
105 /* generates f2 frames from otherwise fully formatted sectors (generated by
106 do_encode_L2()). */
107 #define EDC_SCRAMBLE_NOSWAP 1 /* Do not swap bytes while scrambling */
108 int scramble_L2(unsigned char *inout);
110 /* r-w sub channel definitions */
111 #define RS_SUB_RW_BITS 6
113 #define PACKETS_PER_SUBCHANNELFRAME 4
114 #define LSUB_RAW 18
115 #define LSUB_QRAW 2
116 /* 6 bit */
117 #define LSUB_Q 2
118 #define LSUB_P 4
120 /* R-W subchannel encoder */
121 /* On input: 72 bytes packed user data, four frames with each 18 bytes.
122 On output: per frame: 2 bytes user data, 2 bytes Q parity,
123 16 bytes user data, 4 bytes P parity.
124 Options:
125 delay1: use low level delay line
126 scramble: perform low level permutations
127 */
128 int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
129 unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
130 int delay1, int scramble);
131 int do_decode_sub(unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
132 unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
133 int delay1, int scramble);
135 int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q]);
136 int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]);
.