Joel Auterson | DWG out now! @joelotter.com · Apr 24 Here's the loadogg function from SoLoud, which we use for cross-platform audio (it's great). It uses stb_vorbis for parsing .ogg files. When you open a file with stb_vorbis, it needs to extract a bunch of information about the file, before it's even started playing anything.
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How it does this is honestly a little beyond my comprehension but what I can tell for sure is that it is repeatedly seeking around the file and reading out sections byte-by-byte, each of which is its own I/O call. My guess is that this is because .ogg is a paged format (thank you Wikipedia):