pile-audio refactor

crates/pile-flac/tests/files/flac_custom/README.md

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+# Custom FLAC test files
+
+These are flac files created specifically for Copper, and test cases that the flac test toolkit doesn't cover.
+Most of these are modified copies of files in `flac_subset`, `flac_faulty`, or `flac_uncommon`
+
+
+## Manifest
+
+- `01 - many images.flac`: This is `flac_subset/50` with additional images from `56`, `57`, `58`, and `59`, in that order.
+  - Image 0: from file `50`, type is `3`, description is empty.
+  - Image 1: from file `56`, type is `17`, description is `lorem`.
+  - Image 2: from file `57`, type is `2`, description is `ipsum`.
+  - Image 3: from file `58`, type is `12`, description is `dolor`.
+  - Image 4: from file `59`, type is `4`, description is `est`.
+  - Image `57` is also stored in the vorbis comment as a `METADATA_BLOCK_PICTURE`.
+- `02 - picture in vorbis comment.flac`: This is `flac_subset/57`, but with the image stored inside a vorbis `METADATA_BLOCK_PICTURE` comment instead of a proper flac picture metablock.
+- `03 - faulty picture in vorbis comment.flac`: This is `02`, but with a corrupt picture.