def extract_data(self, timestamp, data, offset): """Extract the data from the feature's raw data. Args: timestamp (int): Data's timestamp. data (str): The data read from the feature. offset (int): Offset where to start reading data. Returns: :class:`blue_st_sdk.feature.ExtractedData`: Container of the number of bytes read and the extracted data. Raises: :exc:`blue_st_sdk.utils.blue_st_exceptions.InvalidDataException` if the data array has not enough data to read. """ if len(data) - offset < self.DATA_LENGTH_BYTES: raise InvalidDataException( 'There are no %s bytes available to read.' \ % (self.DATA_LENGTH_BYTES)) sample = Sample( [LittleEndian.bytes_to_int16(data, offset) / self.SCALE_FACTOR, LittleEndian.bytes_to_int16(data, offset + 2) / self.SCALE_FACTOR, LittleEndian.bytes_to_int16(data, offset + 4) / self.SCALE_FACTOR], self.get_fields_description(), timestamp) return ExtractedData(sample, self.DATA_LENGTH_BYTES)
def extract_data(self, timestamp, data, offset): """Extract the audio sync data from the feature's raw data. In this case it reads a short integer (adpcm_index) and an integer (adpcm_predsample). Args: data (bytearray): The data read from the feature (a 6 bytes array). offset (int): Offset where to start reading data (0 by default). Returns: :class:`blue_st_sdk.feature.ExtractedData`: Container of the number of bytes read (6) and the extracted data (audio sync info, a short and an int). Raises: :exc:`blue_st_sdk.utils.blue_st_exceptions.InvalidDataException` if the data array has not enough data to read. """ if len(data) != self.DATA_LENGTH_BYTES: raise InvalidDataException( 'There are no %d bytes available to read.' \ % (self.DATA_LENGTH_BYTES)) sample = Sample([ LittleEndian.bytes_to_int16(data, 0), LittleEndian.bytes_to_int32(data, 2) ], self.get_fields_description(), None) return ExtractedData(sample, self.DATA_LENGTH_BYTES)
def get_audio(self, sample): """Get the audio data from a sample. Args: sample (:class:`blue_st_sdk.feature.Sample`): Sample data. Returns: short[]: audio values if the data array is valid, None[] otherwise. """ audioPckt = [] if sample is not None: if sample._data: if sample._data[0] is not None: length = len(sample._data) audioPckt = [None] * length for i in range(0,length): if sample.data[i] != None: audioPckt[i] = LittleEndian.bytes_to_int16(sample._data[i], (2*i)) return audioPckt return audioPckt