diplomat.utils.frame_store_fmt.DLFSReader¶

class diplomat.utils.frame_store_fmt.DLFSReader(file: BinaryIO)[source]¶

A DIPLOMAT Frame Store Reader. Allows for reading “.dlfs” files.

__init__(file: BinaryIO)[source]¶

Create a new DIPLOMAT Frame Store Reader.

Parameters:: file – The binary file object to read a frame store from, file opened with ‘rb’.

Methods

`__init__`(file)	Create a new DIPLOMAT Frame Store Reader.
`close`()	Close this frame reader, cleaning up any resources used during reading from the file.
`get_header`()	Get the header of this Diplomat frame store file.
`has_next`([num_frames])	Checks if this frame store object at least num_frames more frames to be read.
`read_frames`([num_frames])	Read the next num_frames frames from this frame store object and returns a TrackingData object.
`seek_frame`(frame_idx)	Make this frame reader seek to the given frame index.
`tell_frame`()	Get the current frame the frame reader is on.

Attributes

`HEADER_DATA_TYPES`
`HEADER_OFFSETS`

_assert_true(assertion: bool, error_msg: str)[source]¶: Private method, if the assertion is false, throws a ValueError.

_find_header(file: BinaryIO)[source]¶: Private method, find the start of a dlfs file.

close()[source]¶: Close this frame reader, cleaning up any resources used during reading from the file. Does not close the passed file handle!

Get the header of this Diplomat frame store file.

Returns:: A DLFSHeader object, contains important metadata info from this frame store.

has_next(num_frames: int = 1) → bool[source]¶

Checks if this frame store object at least num_frames more frames to be read.

Parameters:: num_frames – An Integer, The number of frames to check the availability of, defaults to 1.
Returns:: True if there are at least num_frames more frames to be read, otherwise False.

read_frames(num_frames: int = 1) → TrackingData[source]¶

Read the next num_frames frames from this frame store object and returns a TrackingData object.

Parameters:: num_frames – The number of frames to read from the frame store.
Returns:: A TrackingData object storing all frame info that was stored in this Diplomat Frame Store….
Raises:: An EOFError if more frames were requested then were available.

seek_frame(frame_idx: int)[source]¶

Make this frame reader seek to the given frame index.

Parameters:: frame_idx – An integer, the frame index to have this frame reader seek to. Must land within the valid frame range for this file, being 0 to frame_count - 1.

tell_frame() → int[source]¶

Get the current frame the frame reader is on.

Returns:: An integer, being the current frame the DLFSReader will read next.