blosc2.CParams

class blosc2.CParams(codec: ~blosc2.Codec | int = Codec.ZSTD, codec_meta: int = 0, clevel: int = 1, use_dict: bool = False, typesize: int = 8, nthreads: int = <factory>, blocksize: int = 0, splitmode: ~blosc2.SplitMode = SplitMode.ALWAYS_SPLIT, filters: list[~blosc2.Filter | int] = <factory>, filters_meta: list[int] = <factory>, tuner: ~blosc2.Tuner = Tuner.STUNE)

Dataclass for hosting the different compression parameters.

Parameters:

• codec (Codec or int) – The compressor code. Default is Codec.ZSTD.

• codec_meta (int) – The metadata for the compressor code, 0 by default.

• clevel (int) – The compression level from 0 (no compression) to 9 (maximum compression). Default: 1.

• use_dict (bool) – Use dicts or not when compressing (only for blosc2.Codec.ZSTD). Default: False.

• typesize (int from 1 to 255) – The data type size. Default: 8.

• nthreads (int) – The number of threads to use internally. By default, the value of blosc2.nthreads is used. If not set with blosc2.set_nthreads(), blosc2 computes a good guess for it.

• blocksize (int) – The requested size of the compressed blocks. If 0 (the default) blosc2 chooses it automatically.

• splitmode (SplitMode) – The split mode for the blocks. The default value is SplitMode.ALWAYS_SPLIT.

• filters (Filter or int list) – The sequence of filters. Default: [Filter.NOFILTER, Filter.NOFILTER, Filter.NOFILTER, Filter.NOFILTER, Filter.NOFILTER, Filter.SHUFFLE].

• filters_meta (list) – The metadata for filters. Default: [0, 0, 0, 0, 0, 0].

• tuner (Tuner) – The tuner to use. Default: Tuner.STUNE.

__init__(codec: ~blosc2.Codec | int = Codec.ZSTD, codec_meta: int = 0, clevel: int = 1, use_dict: bool = False, typesize: int = 8, nthreads: int = <factory>, blocksize: int = 0, splitmode: ~blosc2.SplitMode = SplitMode.ALWAYS_SPLIT, filters: list[~blosc2.Filter | int] = <factory>, filters_meta: list[int] = <factory>, tuner: ~blosc2.Tuner = Tuner.STUNE) → None

Methods

__init__([codec, codec_meta, clevel, ...])

Attributes

blocksize
clevel
codec
codec_meta
splitmode
tuner
typesize
use_dict
nthreads
filters
filters_meta