ecc.h
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上传日期:2007-01-06
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- /* compact disc reed-solomon routines
- * (c) 1998 by Heiko Eissfeldt, heiko@colossus.escape.de
- */
- #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
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* 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()). */
- int scramble_L2(unsigned char *inout);
- #ifdef __cplusplus
- }
- #endif
- /* 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
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* 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]);
- #ifdef __cplusplus
- }
- #endif