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59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
"""
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Canon CR2 raw image data, version 2.0 image metadata extractor.
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Authors: Fernando Crespo
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Creation date: 21 february 2017
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"""
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from hachoir.metadata.metadata import (registerExtractor, RootMetadata)
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from hachoir.parser.image import CR2File
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from hachoir.metadata.safe import fault_tolerant
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class CR2Metadata(RootMetadata):
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key_to_attr = {
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"ImageWidth": "width",
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"ImageLength": "height",
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"ImageDescription": "comment",
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"DocumentName": "title",
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"XResolution": "width_dpi",
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"YResolution": "height_dpi",
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}
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def extract(self, tiff):
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if "ifd[0]" in tiff:
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self.useIFD(tiff["ifd[0]"])
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self.camera_manufacturer = tiff["ifd[0]"]["value[4]"].value
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self.camera_model = tiff["ifd[0]"]["value[5]"].value
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if "exif[0]" in tiff:
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self.date_time_original = tiff["exif[0]"]["value[7]"].value
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self.date_time_digitized = tiff["exif[0]"]["value[8]"].value
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def useIFD(self, ifd):
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attr = {}
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for entry in ifd.array("entry"):
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self.processIfdEntry(ifd, entry, attr)
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if 'BitsPerSample' in attr and 'SamplesPerPixel' in attr:
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self.bits_per_pixel = attr[
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'BitsPerSample'] * attr['SamplesPerPixel']
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@fault_tolerant
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def processIfdEntry(self, ifd, entry, attr):
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tag = entry["tag"].display
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if tag in {"BitsPerSample", "SamplesPerPixel"}:
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value = ifd.getEntryValues(entry)[0].value
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attr[tag] = value
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return
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try:
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attrname = self.key_to_attr[tag]
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except KeyError:
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return
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value = ifd.getEntryValues(entry)[0].value
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if tag in {"XResolution", "YResolution"}:
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value = round(value)
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setattr(self, attrname, value)
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registerExtractor(CR2File, CR2Metadata)
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