dbgetskew

int dbgetskew(DB_Signal s)

Return:

(int)

the skew (in frames) for input signal s

This function returns the skew (as recorded in the `header' file, but in frame intervals rather than in sample intervals) of the specified input signal, or 0 if s is not a valid input signal number. Since sample vectors returned by getvec or getframe are already corrected for skew, dbgetskew is useful primarily for programs that need to rewrite existing `header' files, where it is necessary to preserve the previously recorded skews. The following code fragment demonstrates how this can be done:

char *record;
int nsig;
DB_Signal s;
static DB_Siginfo siarray[DB_MAXSIG];

...

if ((nsig = isigopen(record, siarray, DB_MAXSIG)) < 1)
    exit(1);
for (s = 0; s < nsig; s++) {
    dbsetskew(s, dbgetskew(s));
    dbsetstart(s, dbgetstart(s));
}
setheader(record, siarray, (unsigned)nsig);

Note that this function does not determine the skew between signals; the problem of doing so is not possible to solve in the general case. dbgetskew merely reports what has previously been determined by other means and recorded in the `header' file for the input record. (This function was first introduced in DB library version 9.4.)

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