128 lines
4.8 KiB
C
128 lines
4.8 KiB
C
/* @(#)ecc.h 1.6 12/12/02 Copyright 1998-2002 Heiko Eissfeldt, Joerg Schilling */
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/*
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* compact disc reed-solomon routines
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*
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* (c) 1998-2002 by Heiko Eissfeldt, heiko@colossus.escape.de
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* (c) 2002-2012 by Joerg Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#define RS_L12_BITS 8
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/* audio sector definitions for CIRC */
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#define FRAMES_PER_SECTOR 98
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/* user data bytes per frame */
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#define L1_RAW 24
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/* parity bytes with 8 bit */
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#define L1_Q 4
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#define L1_P 4
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/* audio sector Cross Interleaved Reed-Solomon Code (CIRC) encoder (layer 1) */
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/*
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* adds P- and Q- parity information to audio (f2) frames. Also
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* optionally handles the various delays and permutations. The output with all
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* stages enabled can be fed into the Eight-Fourteen-Modulator.
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* On input: 2352 bytes of audio data is given.
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* On output: 3136 bytes of CIRC enriched audio data are returned.
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*/
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int do_encode_L1 __PR((unsigned char in[L1_RAW*FRAMES_PER_SECTOR],
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unsigned char out[(L1_RAW+L1_Q+L1_P)*FRAMES_PER_SECTOR],
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int delay1, int delay2, int delay3, int scramble));
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/* data sector definitions for RSPC */
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/* user data bytes per frame */
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#define L2_RAW (1024*2)
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/* parity bytes for 16 bit units */
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#define L2_Q (26*2*2)
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#define L2_P (43*2*2)
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/* known sector types */
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#define MODE_0 0
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#define MODE_1 1
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#define MODE_2 2
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#define MODE_2_FORM_1 3
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#define MODE_2_FORM_2 4
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/* set one of the MODE_* constants for subsequent data sector formatting */
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int set_sector_type __PR((int st));
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/* get the current sector type setting for data sector formatting */
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int get_sector_type __PR((void));
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/* data sector layer 2 Reed-Solomon Product Code encoder */
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/*
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* encode the given data portion depending on sector type (see
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* get/set_sector_type() functions). Use the given address for the header.
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* The returned data is __unscrambled__ and not in F2-frame format (for that
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* see function scramble_L2()).
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* Supported sector types:
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* MODE_0: a 12-byte sync field, a header and 2336 zeros are returned.
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* MODE_1: the user data portion (2048 bytes) has to be given
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* at offset 16 in the inout array.
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* Sync-, header-, edc-, spare-, p- and q- fields will be added.
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* MODE_2: the user data portion (2336 bytes) has to be given
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* at offset 16 in the inout array.
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* Sync- and header- fields will be added.
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* MODE_2_FORM_1: the user data portion (8 bytes subheader followed
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* by 2048 bytes data) has to be given at offset 16
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* in the inout array.
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* Sync-, header-, edc-, p- and q- fields will be added.
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* MODE_2_FORM_2: the user data portion (8 bytes subheader followed
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* by 2324 bytes data) has to be given at offset 16
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* in the inout array.
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* Sync-, header- and edc- fields will be added.
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*/
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int do_encode_L2 __PR((unsigned char *inout, int sectortype, unsigned address));
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int encode_L2_Q __PR((unsigned char inout[4 + L2_RAW + 4 + 8 + L2_P + L2_Q]));
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int encode_L2_P __PR((unsigned char inout[4 + L2_RAW + 4 + 8 + L2_P]));
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int decode_L2_Q __PR((unsigned char inout[4 + L2_RAW + 12 + L2_Q]));
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int decode_L2_P __PR((unsigned char inout[4 + L2_RAW + 12 + L2_Q + L2_P]));
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unsigned int build_edc __PR((unsigned char inout[], int from, int upto));
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/*
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* generates f2 frames from otherwise fully formatted sectors (generated by
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* do_encode_L2()).
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*/
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#define EDC_SCRAMBLE_NOSWAP 1 /* Do not swap bytes while scrambling */
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int scramble_L2 __PR((unsigned char *inout));
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/* r-w sub channel definitions */
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#define RS_SUB_RW_BITS 6
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#define PACKETS_PER_SUBCHANNELFRAME 4
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#define LSUB_RAW 18
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#define LSUB_QRAW 2
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/* 6 bit */
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#define LSUB_Q 2
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#define LSUB_P 4
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/* R-W subchannel encoder */
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/*
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* On input: 72 bytes packed user data, four frames with each 18 bytes.
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* On output: per frame: 2 bytes user data, 2 bytes Q parity,
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* 16 bytes user data, 4 bytes P parity.
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* Options:
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* delay1: use low level delay line
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* scramble: perform low level permutations
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*/
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int do_encode_sub __PR((unsigned char in[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
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unsigned char out[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
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int delay1, int scramble));
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int do_decode_sub __PR((unsigned char in[(LSUB_RAW+LSUB_Q+LSUB_P)*PACKETS_PER_SUBCHANNELFRAME],
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unsigned char out[LSUB_RAW*PACKETS_PER_SUBCHANNELFRAME],
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int delay1, int scramble));
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int decode_LSUB_Q __PR((unsigned char inout[LSUB_QRAW + LSUB_Q]));
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int decode_LSUB_P __PR((unsigned char inout[LSUB_RAW + LSUB_Q + LSUB_P]));
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