class Emotiv(object):
"""
Receives, decrypts and stores packets received from Emotiv Headsets and other sources.
"""
# TODO: Add a calibration mechanism, get a "noise average" per sensor or even a "noise pattern" to filter
# sensor values when processing packets received. Ideally this would be done not on someone's head.
# TODO: Add filters for facial expressions, muscle contractions.
def __init__(self, display_output=False, serial_number=None, is_research=False, write=False,
write_encrypted=False, write_values=True, input_source="emotiv",
sys_platform=system_platform, verbose=False):
"""
Sets up initial values.
:param display_output - Should non-error output be displayed to console?
:param serial_number - Specify serial_number, needed to decrypt packets for raw data reader and special cases.
:param is_research - Is EPOC headset research edition? Doesn't seem to work even if it is.
:param write - Write data to csv.
:param write_encrypted - Write encrypted data
:param write_values - Write decrypted sensor data, True overwrites exporting data from dongle pre-processing.
:param input_source - Source to read from, emotiv or a file name
(must be a csv, exported from emokit or following our format)
:param sys_platform - Operating system, to avoid global statement
Expect performance to suffer when writing data to a csv.
"""
self.running = False
# Queue with EmotivPackets that have been received.
self.packets = Queue()
# Battery percent, as int.
self.battery = 0
# Display sensor values in console.
self.display_output = display_output
# Print details of operation in console, exceptions, etc.
self.verbose = verbose
# Should be True for research edition EPOCs and newer EPOC+s, apparently.
self.is_research = is_research
self.sensors = sensors_mapping
# The EPOCs serial number.
self.serial_number = serial_number
# Only really applies to quality value calculation, probably needs some updating.
self.old_model = False
# Write data to disk.
self.write = write
# Assume we are going to read encrypted data from the headset.
self.read_encrypted = True
# Not used at the moment.
self.read_values = False
# Write the data received as is.
self.write_encrypted = False
# Write the data received after decrypting it.
self.write_decrypted = False
# Write values and quality values of each sensor.
self.write_values = write_values
# The current platform.
self.platform = sys_platform
# The number of times data was received.
self.packets_received = 0
# The number of times data was decrypted or made into EmotivPackets.
self.packets_processed = 0
# The source of the emotiv data.
self.input_source = input_source
# If the input source is not an emotiv headset, it is a file.
self.reader = None
self.lock = Lock()
# Setup output writers, multiple types can be output now at once.
self.encrypted_writer = None
self.decrypted_writer = None
self.value_writer = None
self.crypto = None
# Setup the crypto thread, if we are reading from an encrypted data source.
# Setup emokit loop thread. This thread coordinates the work done from the reader to be decrypted and queued
# into EmotivPackets.
self.thread = Thread(target=self.run)
self._stop_signal = False
self.thread.setDaemon(True)
self.start()
def initialize_reader(self):
if self.input_source != "emotiv":
# If the name of the input source starts with emotiv_encrypted, get the serial number.
if self.input_source.startswith('emotiv_encrypted'):
# Split the name of the input by _'s and retrieve the serial number, typically located after
# emotiv_encrypted_data_ so index 3.
self.serial_number = self.input_source.split('_')[3]
else:
# Otherwise, check if it is values only and set read_encrypted to False.
self.read_encrypted = False
if self.input_source.startswith('emotiv_values'):
self.read_values = True
self.reader = EmotivReader(file_name=self.input_source, mode="csv")
# Make sure the reader still has the serial number set, since we won't be obtaining it from the headset.
self.reader.serial_number = self.serial_number
else:
# Initialize an EmotivReader with default values, it will try to locate a headset.
self.reader = EmotivReader()
if self.reader.serial_number is not None:
# If EmotivReader found a serial number automatically, change local serial number to the reader serial.
self.serial_number = self.reader.serial_number
def initialize_writer(self):
if self.write_encrypted:
# Only write encrypted if we are reading encrypted.
if self.read_encrypted:
self.encrypted_writer = EmotivWriter('emotiv_encrypted_data_%s_%s.csv' % (
self.reader.serial_number, str(datetime.now()).replace(':', '-')), mode="csv")
# Setup decrypted data writer.
if self.write_decrypted:
# If we are reading values we do not have the decrypted data, rather than reconstructing it do not write it.
if not self.read_values:
self.decrypted_writer = EmotivWriter('emotiv_data_%s.csv' % str(datetime.now()).replace(':', '-'),
mode="csv")
# Setup sensor value writer.
if self.write_values:
self.value_writer = EmotivWriter('emotiv_values_%s.csv' % str(datetime.now()).replace(':', '-'),
mode="csv")
# Make the first row in the file the header with the sensor name
header_row = []
for key in self.sensors.keys():
header_row.append(key + " Value")
header_row.append(key + " Quality")
self.value_writer.write(header_row)
def initialize_crypto(self):
if self.read_encrypted:
self.crypto = EmotivCrypto(self.serial_number, self.is_research)
def start(self):
"""
Starts emotiv, called upon initialization.
"""
self.running = True
self.thread.start()
def stop(self):
"""
Stops emotiv
:return:
"""
self.reader.stop()
if self.crypto is not None:
self.crypto.stop()
self._stop_signal = True
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
if traceback:
self.log(traceback)
self.stop()
def log(self, message):
"""
Logging function, only prints if verbose is True.
:param message: Message to log/print
"""
if self.display_output and self.verbose:
print("%s" % message)
def run(self):
""" Do not call explicitly, called upon initialization of class or self.start()
The main emokit loop.
:param reader: EmotivReader class
:param crypto: EmotivCrypto class
"""
self.initialize_reader()
self.initialize_writer()
self.initialize_crypto()
self.reader.start()
if self.crypto is not None:
self.crypto.start()
dirty = True
last_packets_received = 0
last_packets_decrypted = 0
tick_time = datetime.now()
packets_received_since_last_update = 0
packets_processed_since_last_update = 0
stale_rx = 0
restarting_reader = False
self.lock.acquire()
while self.running:
self.lock.release()
if not self.reader.data.empty():
try:
raw_data = self.reader.data.get()
except KeyboardInterrupt:
self.quit()
if self.write and self.write_encrypted and self.input_source == 'emotiv':
# Due to some encoding problem to save encrypted data we must first convert it to binary.
if sys.version_info >= (3, 0):
self.encrypted_writer.write(map(bin, bytearray(raw_data, encoding='latin-1')))
else:
self.encrypted_writer.write(map(bin, bytearray(raw_data)))
self.packets_received += 1
if not self.read_encrypted:
if not self.read_values:
new_packet = EmotivPacket(raw_data)
if new_packet.battery is not None:
self.battery = new_packet.battery
self.packets.put_nowait(new_packet)
dirty = True
self.packets_processed += 1
else:
# TODO: Implement read from values.
pass
else:
if self.input_source != 'emotiv' and self.read_encrypted:
if len(raw_data) != 32:
self.reader.lock.acquire()
self.reader.running = False
self.reader.lock.release()
self.crypto.stop()
self.running = False
raise ValueError("Reached end of data or corrupted data.")
# Decode binary data stored in file.
if sys.version_info >= (3, 0):
raw_data = [int(bytes(item, encoding='latin-1').decode(), 2) for item in raw_data]
else:
raw_data = [int(item.decode(), 2) for item in raw_data]
raw_data = ''.join(map(chr, raw_data[:]))
self.crypto.add_task(raw_data)
if self.crypto is not None:
if self.crypto.data_ready():
decrypted_packet_data = self.crypto.get_data()
if self.write_decrypted:
if self.decrypted_writer is not None:
self.decrypted_writer.write(decrypted_packet_data)
self.packets_processed += 1
new_packet = EmotivPacket(decrypted_packet_data)
if new_packet.battery is not None:
self.battery = new_packet.battery
self.packets.put_nowait(new_packet)
if self.write_values:
data_to_write = []
for key in self.sensors.keys():
data_to_write.extend([new_packet.sensors[key]['value'], new_packet.sensors[key]['quality']])
if self.value_writer is not None:
self.value_writer.write(data_to_write)
dirty = True
if self._stop_signal:
self.reader.lock.acquire()
if not self.reader.running and not restarting_reader:
if self.crypto is not None:
self.crypto.lock.acquire()
if not self.crypto.running and not self.crypto.data_ready():
self.running = False
self.crypto.lock.release()
else:
self.running = False
self.reader.lock.release()
if tick_time.second != datetime.now().second:
packets_received_since_last_update = self.packets_received - last_packets_received
if packets_received_since_last_update == 1 or packets_received_since_last_update == 0:
stale_rx += 1
packets_processed_since_last_update = self.packets_processed - last_packets_decrypted
last_packets_decrypted = self.packets_processed
last_packets_received = self.packets_received
tick_time = datetime.now()
dirty = True
self.reader.lock.acquire()
if restarting_reader and self.reader.stopped:
self.reader.lock.release()
print("Restarting reader")
stale_rx = 0
self.initialize_reader()
self.reader.start()
restarting_reader = False
print("End restarting")
else:
self.reader.lock.release()
if stale_rx > 5 and not restarting_reader:
self.reader.stop()
restarting_reader = True
if self.display_output:
if dirty:
if system_platform == "Windows":
os.system('cls')
else:
os.system('clear')
print("Packets Received: %s Packets Processed: %s" % (self.packets_received,
self.packets_processed))
print('\n'.join("%s Reading: %s Quality: %s" %
(k[1], self.sensors[k[1]]['value'],
self.sensors[k[1]]['quality']) for k in enumerate(self.sensors)))
print("Battery: %i" % self.battery)
print("Sample Rate Rx: {0} Crypto: {1}".format(
packets_received_since_last_update,
packets_processed_since_last_update)
)
dirty = False
self.lock.acquire()
self.lock.release()
def dequeue(self):
"""
Returns an EmotivPacket popped off the Queue.
"""
try:
if not self.packets.empty():
return self.packets.get()
except KeyboardInterrupt:
self.quit()
return None
def clear_queue(self):
self.packets = Queue()
def quit(self):
"""
A little more forceful stop.
"""
self.stop()
os._exit(1)
def force_quit(self):
"""
Kill emokit. Might leave files and other objects open or locked.
"""
os._exit(1)
def initialize_crypto(self):
if self.read_encrypted:
self.crypto = EmotivCrypto(self.serial_number, self.is_research)
