| 1 | #!/usr/bin/python -S
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| 2 | #
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| 3 | # python script to genereate a hash for a video file in MythVideo
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| 4 | #
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| 5 | # @url $$
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| 6 | # @date $$
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| 7 | # @version $$
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| 8 | # @author $$
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| 9 | #
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| 10 |
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| 11 | import os, struct, sys
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| 12 |
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| 13 | def hashFile(filename):
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| 14 | '''Create metadata hash values for mythvideo files
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| 15 | return a hash value
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| 16 | return u'' if the was an error with the video file or the video file length was zero bytes
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| 17 | '''
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| 18 | # generate a hash for a file on the local system
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| 19 | # For original code: http://trac.opensubtitles.org/projects/opensubtitles/wiki/HashSourceCodes#Python
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| 20 | try:
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| 21 | longlongformat = 'q' # long long
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| 22 | bytesize = struct.calcsize(longlongformat)
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| 23 | f = open(filename, "rb")
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| 24 | filesize = os.path.getsize(filename)
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| 25 | hash = filesize
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| 26 | if filesize < 65536 * 2: # Video file is too small
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| 27 | return u''
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| 28 | for x in range(65536/bytesize):
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| 29 | buffer = f.read(bytesize)
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| 30 | (l_value,)= struct.unpack(longlongformat, buffer)
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| 31 | hash += l_value
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| 32 | hash = hash & 0xFFFFFFFFFFFFFFFF #to remain as 64bit number
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| 33 | f.seek(max(0,filesize-65536),0)
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| 34 | for x in range(65536/bytesize):
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| 35 | buffer = f.read(bytesize)
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| 36 | (l_value,)= struct.unpack(longlongformat, buffer)
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| 37 | hash += l_value
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| 38 | hash = hash & 0xFFFFFFFFFFFFFFFF
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| 39 | f.close()
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| 40 | returnedhash = "%016x" % hash
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| 41 | return returnedhash
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| 42 |
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| 43 | except(IOError): # Accessing to this video file caused and error
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| 44 | return u''
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| 45 | # end hashFile()
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| 46 |
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| 47 | print hashFile(sys.argv[1])
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