def grab_next_frame_blocking(self):
curmsg = self._get_network_buf()
self.last_timestamp = curmsg.timestamp
self.last_framenumber = curmsg.framenumber
outbuf = _cam_iface_shm.get_data_copy(curmsg)
return outbuf
def grab_next_frame_into_buf_blocking(self, outbuf, bypass_buffer_checks=False):
"""grab frame into user-supplied buffer"""
# XXX this method isn't done yet...
# XXX change to read data out of shared memory as quickly as
# possible (no self.savemsg)
if self.savebuf is not None:
# print 'ADS 1'
if self.save_framenumber == self.next_framenumber:
# print 'ADS 1.1'
self.last_timestamp = self.save_timestamp
self.last_framenumber = self.save_framenumber
self.next_framenumber = self.save_framenumber + 1
outbuf = self.savebuf
self.savebuf = None
else:
# print 'ADS 1.2'
assert self.save_framenumber > self.next_framenumber
self.next_framenumber += 1
raise FrameDataMissing("missing data")
else:
# print 'ADS 2'
curmsg = self._get_network_buf()
cur_timestamp = curmsg.timestamp
cur_framenumber = curmsg.framenumber
# print 'cur_framenumber',cur_framenumber
curbuf = _cam_iface_shm.get_data_copy(curmsg, optional_preallocated_buf=outbuf)
if self.last_framenumber is None:
# print 'ADS 2.1'
# first frame
self.last_timestamp = cur_timestamp
self.last_framenumber = cur_framenumber
self.next_framenumber = cur_framenumber + 1
outbuf = curbuf
else:
# print 'ADS 2.2'
if self.next_framenumber == cur_framenumber:
# print 'ADS 2.3'
# no frames skipped
self.last_timestamp = cur_timestamp
self.last_framenumber = cur_framenumber
self.next_framenumber = cur_framenumber + 1
outbuf = curbuf
else:
# print 'ADS 2.4'
assert cur_framenumber > self.next_framenumber
self.savebuf = curbuf
self.save_framenumber = cur_framenumber
self.save_timestamp = cur_timestamp
self.next_framenumber += 1
raise FrameDataMissing("missing data")
return outbuf
