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87 lines
3.0 KiB
87 lines
3.0 KiB
6 years ago
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"""RouteFrameReader indexes and reads frames across routes, by frameId or segment indices."""
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from tools.lib.framereader import FrameReader
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class _FrameReaderDict(dict):
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def __init__(self, camera_paths, cache_paths, framereader_kwargs, *args, **kwargs):
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super(_FrameReaderDict, self).__init__(*args, **kwargs)
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if cache_paths is None:
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cache_paths = {}
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if not isinstance(cache_paths, dict):
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cache_paths = { k: v for k, v in enumerate(cache_paths) }
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self._camera_paths = camera_paths
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self._cache_paths = cache_paths
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self._framereader_kwargs = framereader_kwargs
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def __missing__(self, key):
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if key < len(self._camera_paths) and self._camera_paths[key] is not None:
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frame_reader = FrameReader(self._camera_paths[key],
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self._cache_paths.get(key), **self._framereader_kwargs)
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self[key] = frame_reader
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return frame_reader
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else:
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raise KeyError("Segment index out of bounds: {}".format(key))
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class RouteFrameReader(object):
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"""Reads frames across routes and route segments by frameId."""
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def __init__(self, camera_paths, cache_paths, frame_id_lookup, **kwargs):
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"""Create a route framereader.
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Inputs:
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TODO
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kwargs: Forwarded to the FrameReader function. If cache_prefix is included, that path
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will also be used for frame position indices.
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"""
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self._first_camera_idx = next(i for i in range(len(camera_paths)) if camera_paths[i] is not None)
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self._frame_readers = _FrameReaderDict(camera_paths, cache_paths, kwargs)
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self._frame_id_lookup = frame_id_lookup
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@property
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def w(self):
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"""Width of each frame in pixels."""
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return self._frame_readers[self._first_camera_idx].w
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@property
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def h(self):
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"""Height of each frame in pixels."""
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return self._frame_readers[self._first_camera_idx].h
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def get(self, frame_id, **kwargs):
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"""Get a frame for a route based on frameId.
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Inputs:
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frame_id: The frameId of the returned frame.
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kwargs: Forwarded to BaseFrameReader.get. "count" is not implemented.
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"""
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segment_num, segment_id = self._frame_id_lookup.get(frame_id, (None, None))
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if segment_num is None or segment_num == -1 or segment_id == -1:
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return None
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else:
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return self.get_from_segment(segment_num, segment_id, **kwargs)
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def get_from_segment(self, segment_num, segment_id, **kwargs):
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"""Get a frame from a specific segment with a specific index in that segment (segment_id).
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Inputs:
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segment_num: The number of the segment.
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segment_id: The index of the return frame within that segment.
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kwargs: Forwarded to BaseFrameReader.get. "count" is not implemented.
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"""
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if "count" in kwargs:
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raise NotImplementedError("count")
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return self._frame_readers[segment_num].get(segment_id, **kwargs)[0]
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def close(self):
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frs = self._frame_readers
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self._frame_readers.clear()
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for fr in frs:
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fr.close()
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def __enter__(self): return self
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def __exit__(self, type, value, traceback): self.close()
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