116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
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/* A private header file used by nabtslib.c; this is not part of the
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public interface. */
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#ifndef NABTSLIB_H
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#define NABTSLIB_H
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/* How many bytes are in a bundle before FEC is added? */
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#define BUNDLE_SMALL (26*14)
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/* How many bytes are in a bundle after FEC is added? */
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#define BUNDLE_LARGE (28*16)
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extern void nabtslib_exit();
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typedef enum {FEC_OK, FEC_CORRECTABLE, FEC_UNCORRECTABLE, MISSING} fec_stat;
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#ifdef linux
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int NabtsFecReceiveData(int nField, int nTimeMsec, int scan_line,
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unsigned char *pbData, int nDataLen);
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#endif
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extern unsigned char hamming_encode[16];
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typedef enum {fec_status_ok, fec_status_onebyte, fec_status_multibyte,
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fec_status_2byte, fec_status_missing} fec_status;
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typedef struct {
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fec_status status; /* status of the current FEC info */
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int err; /* the current checksum error */
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short errl[2]; /* the galois_log[] of the two bytes of
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the checksum error */
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int byte[2]; /* the locations of the error bytes
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(byte[1] is only valid if
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status == fec_status_2byte) */
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int byte_val[2]; /* the values to XOR into the above bytes
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to make the checksum error 0 */
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int score; /* the number of bits changed by this
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correction */
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int really_onebyte; /* We can compute the optimal
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correction (the one which will
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change the least number of bits).
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However, we don't do this if we
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don't have to (it's slow). If
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status is fec_status_2byte, we have
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done so; if status is
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fec_status_multibyte, we have not.
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If status is fec_status_onebyte, we
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need to look at really_onebyte to
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see if the current correction is
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optimal. */
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} fec_info;
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typedef struct {
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int not_full;
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unsigned char vals[28];
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} Packet;
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typedef struct _stream_struct {
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int stream_addr;
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Packet pack[32];
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fec_info horz[32];
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int last_index;
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struct _stream_struct *next;
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int count;
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int dead_time;
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int confAvgSum;
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int confAvgCount;
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} Stream;
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extern int decode_hamming(unsigned char Val);
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extern int remove_parity(unsigned char *pVal);
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extern int find_err_val(int err_byte, int byte_csum_err, int check_ind);
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extern int compute_csum_horiz(unsigned char *vals, int len);
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extern int compute_csum_vert(unsigned char *vals, int len);
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extern fec_stat check_checksum_horiz(unsigned char *vals, int len, fec_info *inf);
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extern int process_line(unsigned char *);
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extern void init_inv2_coeffs();
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extern void erase_packet(Stream *str, int i);
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extern void complete_bundle(Stream *str, NFECCallback cb, void *ctx, NFECState *st);
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extern void init_nzbits_arr();
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extern unsigned char nzbits_arr[256];
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typedef struct {
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int missing;
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unsigned char vals[28];
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} VBI_Packet;
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#define MAX_RECENT_ADDRS 16
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/* typedef'd to NFECState in nabtsapi.h */
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struct nfec_state_str {
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int *pGroupAddrs;
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int nGroupAddrs;
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Stream *streams;
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/* The following is just some scratch space for
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complete_bundle()... it's too big to put on the stack, if I make
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it a global then my code isn't reentrant, and I don't want to
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bother with allocating and freeing it each time complete_bundle()
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is called (besides, this is probably more efficient) */
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fec_info vert[28];
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struct {
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int addr;
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int count;
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} recent_addrs[MAX_RECENT_ADDRS];
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int n_recent_addrs;
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int field_count;
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};
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#define PROFILE_VALIDATE
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#ifdef PROFILE_VALIDATE
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extern int g_nValidate;
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#endif
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#endif /* NABTSLIB_H */
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