def get_more_evidence():
"""
Obtains a new piece of evidence and introduces it in the appropriate
structures.
"""
if BUF.get_status() is BUF.Status.STOPPED:
return
dtime = _TFACTOR * (T.time() - _T0) * 1000.0
cursize = SIG.get_signal_length()
if dtime - sp2ms(cursize) > sp2ms(_STEP):
nchunks = int((min(ms2sp(dtime), _DURATION) - cursize) / _STEP)
init = _OFFSET + cursize
for i in xrange(len(_REC.leads)):
fragment = _REC.signal[i, init:init + nchunks * _STEP]
if len(fragment) < nchunks * _STEP:
fragment = np.concatenate(
(fragment,
fragment[-1] * np.ones(_STEP - len(fragment) % _STEP)))
SIG.add_signal_fragment(fragment, _REC.leads[i])
for ann in (a for a in _ANNOTS
if ((is_qrs_annotation(a) or a.code is ECGCodes.FLWAV)
and init <= a.time < init + nchunks * _STEP)):
rdef = o.RDeflection()
atime = ann.time - _OFFSET
rdef.time.value = Iv(atime, atime)
#The level is established according to the annotation information.
rdef.level = {
SIG.VALID_LEAD_NAMES[lead]: 127
for lead in _REC.leads
}
rdef.level[SIG.VALID_LEAD_NAMES[_REC.leads[ann.chan]]] = (127 -
ann.num)
rdef.freeze()
BUF.publish_observation(rdef)
newsize = SIG.get_signal_length()
if newsize >= _DURATION or newsize >= len(_REC.signal[0]) - _OFFSET:
BUF.set_status(BUF.Status.STOPPED)
def stop():
"""Stops the acquisition of signal and evidence"""
BUF.set_status(BUF.Status.STOPPED)
def start():
"""Starts the acquisition of signal and evidence"""
global _T0
_T0 = T.time()
BUF.set_status(BUF.Status.ACQUIRING)