Revise how the Blosc codec is specified #225
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cc @jakirkham |
jstriebel
reviewed
Mar 31, 2023
Closed
The `shuffle` mode is now specified more clearly as `null` (0 in Zarr v2), `"bit"` (2 in Zarr v2), or `"byte"` (1 in Zarr v2). Using these constants rather than numbers makes it much easier to know what shuffle mode will be using from manual inspection of the metadata. When shuffling is enabled, the `typesize` must now be specified explicitly in the metadata, rather than determined implicitly from the input data. This allows Blosc to function as a pure "bytes -> bytes" codec rather than an "array -> bytes" codec. The special `shuffle` value of `-1`, which indicated to choose automatically between bit-wise or byte-wise shuffling depending on the typesize value, is not supported in the metadata.
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I updated the shuffle constants to "noshuffle", "shuffle" and "bitshuffle" to match the blosc C API. Per discussions in the ZEP1 review and the recent ZEP meeting, I have retained typesize. |
jstriebel
reviewed
May 3, 2023
Co-authored-by: Jonathan Striebel <[email protected]>
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The
shufflemode is now specified more clearly asnull(0 in Zarr v2),"bit"(2 in Zarr v2), or"byte"(1 in Zarr v2). Using these constants rather than numbers makes it much easier to know what shuffle mode will be using from manual inspection of the metadata.When shuffling is enabled, the
typesizemust now be specified explicitly in the metadata, rather than determined implicitly from the input data. This allows Blosc to function as a pure "bytes -> bytes" codec rather than an "array -> bytes" codec.The special
shufflevalue of-1, which indicated to choose automatically between bit-wise or byte-wise shuffling depending on the typesize value, is not supported in the metadata.