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Mostly as a note to self or TODO list, here are a few ideas I have for more testfiles. These are not for the subset testbench, but perhaps for a security related one, or one specific for fuzzing.

• FLAC files that have a fake sync code in the header
  • Creating FLAC files with samplerates of 65528Hz, 65529Hz, 655280Hz and 655290Hz. With these, a valid sync code (0xFFF8 or 0xFFF9) appear in the samplerate bits
  • Creating FLAC files with blocksizes of 65529 or 65530. Again, the sync code appears
  • Creating FLAC files with a blocksize of 65535 and a blocksize of 248 or 249. Once more, the sync code appears
  • Creating FLAC files with a samplerate of 256kHz or 256Hz. Chance of 1 in 128 that a sync code appears with the right CRC.
• FLAC files where the samplerate, number of channels or bit depth changes halfway a stream
• Extracting all frames in the testbench FLAC files to separate files, and running afl-cmin on them to create a nice fuzzing testset

I'll probably add some more if an idea comes up. Feel free to add ideas.

Since FLAC 1.4.0 is out, making 32-bit encoding and decoding possible, I suggest making test files pertaining to just that.