/*

 * 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

int cd_build_address(unsigned char inout[], int sectortype, unsigned address);

/* 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	GDROM_MODE0

#define MODE_1	GDROM_MODE1

#define MODE_2	GDROM_MODE2_FORMLESS

#define MODE_2_FORM_1	GDROM_MODE2_FORM1

#define MODE_2_FORM_2	GDROM_MODE2_FORM2

/* 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]);