The Joysound Karaoke app for the Switch pulls in music from unencrypted HTTP CDN... and this file format is a perfect example of the kind of failure sadly common in Japanese software development.
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I'm guessing someone was told to write some multiplexing tool. Unfortunately, the tool multiplexed the files in identically sized blocks. The files have a variable bitrate. this makes the multiplexing pointless, because the data is not synchronized *in time*.
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Now, if this happened, I'd expect the people responsible for writing the playback tool to complain (if they knew what to expect). Unfortunately, that would never happen in a Japanese company, because you don't want to make the other person lose face.
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So whoever wrote the playback tool just worked around it, completely negating the point of multiplexing. And what could've been a file format written in the right order, with audio at the end, that can be played and streamed linearly, now no longer can.
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Incidentally, the file format also mixes big-endian and little-endian sections. The audio section header is big-endian, but the mux frame headers are little-endian. So yeah, clearly multiple uncoordinated people involved.
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Is there an exploit for some bug in it?
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That is left as an exercise to the reader ;)
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