2 * This file has been modified for the cdrkit suite.
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).
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.
13 /* @(#)ecc.h 1.4 02/10/19 Copyright 1998-2002 Heiko Eissfeldt, Joerg Schilling */
16 * compact disc reed-solomon routines
18 * (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de
19 * (c) 2002 by Joerg Schilling
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.
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.
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.
38 /* audio sector definitions for CIRC */
39 #define FRAMES_PER_SECTOR 98
40 /* user data bytes per frame */
42 /* parity bytes with 8 bit */
46 /* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */
47 /* adds P- and Q- parity information to audio (f2) frames. Also
48 optionally handles the various delays and permutations. The output with all
49 stages enabled can be fed into the Eight-Fourteen-Modulator.
50 On input: 2352 bytes of audio data is given.
51 On output: 3136 bytes of CIRC enriched audio data are returned.
53 int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR],
54 unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
55 int delay1, int delay2, int delay3, int scramble);
57 /* data sector definitions for RSPC */
58 /* user data bytes per frame */
59 #define L2_RAW (1024*2)
60 /* parity bytes for 16 bit units */
64 /* known sector types */
68 #define MODE_2_FORM_1 3
69 #define MODE_2_FORM_2 4
71 /* set one of the MODE_* constants for subsequent data sector formatting */
72 int set_sector_type(int st);
73 /* get the current sector type setting for data sector formatting */
74 int get_sector_type(void);
76 /* data sector layer 2 Reed-Solomon Product Code encoder */
77 /* encode the given data portion depending on sector type (see
78 get/set_sector_type() functions). Use the given address for the header.
79 The returned data is __unscrambled__ and not in F2-frame format (for that
80 see function scramble_L2()).
81 Supported sector types:
82 MODE_0: a 12-byte sync field, a header and 2336 zeros are returned.
83 MODE_1: the user data portion (2048 bytes) has to be given
84 at offset 16 in the inout array.
85 Sync-, header-, edc-, spare-, p- and q- fields will be added.
86 MODE_2: the user data portion (2336 bytes) has to be given
87 at offset 16 in the inout array.
88 Sync- and header- fields will be added.
89 MODE_2_FORM_1: the user data portion (8 bytes subheader followed
90 by 2048 bytes data) has to be given at offset 16
92 Sync-, header-, edc-, p- and q- fields will be added.
93 MODE_2_FORM_2: the user data portion (8 bytes subheader followed
94 by 2324 bytes data) has to be given at offset 16
96 Sync-, header- and edc- fields will be added.
98 int do_encode_L2(unsigned char *inout, int sectortype, unsigned address);
99 int decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q]);
100 int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]);
101 unsigned int build_edc(unsigned char inout[], int from, int upto);
103 /* generates f2 frames from otherwise fully formatted sectors (generated by
105 #define EDC_SCRAMBLE_NOSWAP 1 /* Do not swap bytes while scrambling */
106 int scramble_L2(unsigned char *inout);
108 /* r-w sub channel definitions */
109 #define RS_SUB_RW_BITS 6
111 #define PACKETS_PER_SUBCHANNELFRAME 4
118 /* R-W subchannel encoder */
119 /* On input: 72 bytes packed user data, four frames with each 18 bytes.
120 On output: per frame: 2 bytes user data, 2 bytes Q parity,
121 16 bytes user data, 4 bytes P parity.
123 delay1: use low level delay line
124 scramble: perform low level permutations
126 int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
127 unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
128 int delay1, int scramble);
129 int do_decode_sub(unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
130 unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
131 int delay1, int scramble);
133 int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q]);
134 int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]);