% SPF = WFDB_getspf;
%
% Get the number of samples per signal per frame.
%
% Unless the application is operating in WFDB_HIGHRES mode (see WFDB_setgvmode)
% and has then opened a multi-frequency record, this function returns 1.  For
% the case of a multi-frequency record being read in high resolution mode,
% however, WFDB_getspf returns the number of samples per signal per frame
% (hence WFDB_sampfreq/WFDB_getspf is the number of frames per second).
%
% SPF: Samples per frame.
%
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