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Diffstat (limited to 'libedc/ecc.h')
| -rw-r--r-- | libedc/ecc.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libedc/ecc.h b/libedc/ecc.h new file mode 100644 index 0000000..76062b2 --- /dev/null +++ b/libedc/ecc.h @@ -0,0 +1,134 @@ +/* + * This file has been modified for the cdrkit suite. + * + * The behaviour and appearence of the program code below can differ to a major + * extent from the version distributed by the original author(s). + * + * For details, see Changelog file distributed with the cdrkit package. If you + * received this file from another source then ask the distributing person for + * a log of modifications. + * + */ + +/* @(#)ecc.h 1.4 02/10/19 Copyright 1998-2002 Heiko Eissfeldt, Joerg Schilling */ + +/* + * compact disc reed-solomon routines + * + * (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de + * (c) 2002 by Joerg Schilling + */ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; see the file COPYING. If not, write to the Free Software + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#define RS_L12_BITS 8 + +/* audio sector definitions for CIRC */ +#define FRAMES_PER_SECTOR 98 +/* user data bytes per frame */ +#define L1_RAW 24 +/* parity bytes with 8 bit */ +#define L1_Q 4 +#define L1_P 4 + +/* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */ +/* adds P- and Q- parity information to audio (f2) frames. Also + optionally handles the various delays and permutations. The output with all + stages enabled can be fed into the Eight-Fourteen-Modulator. + On input: 2352 bytes of audio data is given. + On output: 3136 bytes of CIRC enriched audio data are returned. + */ +int do_encode_L1(unsigned char in[L1_RAW*FRAMES_PER_SECTOR], + unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR], + int delay1, int delay2, int delay3, int scramble); + +/* data sector definitions for RSPC */ +/* user data bytes per frame */ +#define L2_RAW (1024*2) +/* parity bytes for 16 bit units */ +#define L2_Q (26*2*2) +#define L2_P (43*2*2) + +/* known sector types */ +#define MODE_0 0 +#define MODE_1 1 +#define MODE_2 2 +#define MODE_2_FORM_1 3 +#define MODE_2_FORM_2 4 + +/* set one of the MODE_* constants for subsequent data sector formatting */ +int set_sector_type(int st); +/* get the current sector type setting for data sector formatting */ +int get_sector_type(void); + +/* data sector layer 2 Reed-Solomon Product Code encoder */ +/* encode the given data portion depending on sector type (see + get/set_sector_type() functions). Use the given address for the header. + The returned data is __unscrambled__ and not in F2-frame format (for that + see function scramble_L2()). + Supported sector types: + MODE_0: a 12-byte sync field, a header and 2336 zeros are returned. + MODE_1: the user data portion (2048 bytes) has to be given + at offset 16 in the inout array. + Sync-, header-, edc-, spare-, p- and q- fields will be added. + MODE_2: the user data portion (2336 bytes) has to be given + at offset 16 in the inout array. + Sync- and header- fields will be added. + MODE_2_FORM_1: the user data portion (8 bytes subheader followed + by 2048 bytes data) has to be given at offset 16 + in the inout array. + Sync-, header-, edc-, p- and q- fields will be added. + MODE_2_FORM_2: the user data portion (8 bytes subheader followed + by 2324 bytes data) has to be given at offset 16 + in the inout array. + Sync-, header- and edc- fields will be added. +*/ +int do_encode_L2(unsigned char *inout, int sectortype, unsigned address); +int decode_L2_Q(unsigned char inout[4 + L2_RAW + 12 + L2_Q]); +int decode_L2_P(unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]); +unsigned int build_edc(unsigned char inout[], int from, int upto); + +/* generates f2 frames from otherwise fully formatted sectors (generated by + do_encode_L2()). */ +#define EDC_SCRAMBLE_NOSWAP 1 /* Do not swap bytes while scrambling */ +int scramble_L2(unsigned char *inout); + +/* r-w sub channel definitions */ +#define RS_SUB_RW_BITS 6 + +#define PACKETS_PER_SUBCHANNELFRAME 4 +#define LSUB_RAW 18 +#define LSUB_QRAW 2 +/* 6 bit */ +#define LSUB_Q 2 +#define LSUB_P 4 + +/* R-W subchannel encoder */ +/* On input: 72 bytes packed user data, four frames with each 18 bytes. + On output: per frame: 2 bytes user data, 2 bytes Q parity, + 16 bytes user data, 4 bytes P parity. + Options: + delay1: use low level delay line + scramble: perform low level permutations + */ +int do_encode_sub(unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME], + unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME], + int delay1, int scramble); +int do_decode_sub(unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME], + unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME], + int delay1, int scramble); + +int decode_LSUB_Q(unsigned char inout[LSUB_QRAW + LSUB_Q]); +int decode_LSUB_P(unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]); |