seek support in pyannodex

Sun, 27 Aug 2006 15:48:22 +0000
annodex python code tech

One of the problems with pyannodex was that you could only iterate through a list of clips once. That is in something like:

anx = annodex.Reader(sys.argv[1])

for clip in anx.clips:
    print clip.start

for clip in anx.clips:
    print clip.start

Only the first loop would print anything. This is basically because clips returned an iterator, and once the iterator had run through once, it didn't reset the iterator. I had originally (in 0.7.3.1) solved this in a really stupid way, whereby I used class properties to recreate an iterator object each time a clip object was returned. This was obviously sily and I fixed it properly by reseting the file handle in the __iter__ method of my iterator object.

When reviewing this code I also found a nasty bug. The way my iterator worked relied on each read call causing it most one callback, which wasn't actually what was happening. Luckily this is also fixable by having callback functions return ANX_STOP_OK, rather than ANX_CONTINUE. Any way, there is now a new version up which fixes these problems.

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