PackBits¶
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class
numcodecs.packbits.
PackBits
¶ Codec to pack elements of a boolean array into bits in a uint8 array.
Notes
The first element of the encoded array stores the number of bits that were padded to complete the final byte.
Examples
>>> import numcodecs >>> import numpy as np >>> codec = numcodecs.PackBits() >>> x = np.array([True, False, False, True], dtype=bool) >>> y = codec.encode(x) >>> y array([ 4, 144], dtype=uint8) >>> z = codec.decode(y) >>> z array([ True, False, False, True])
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codec_id
= 'packbits'¶
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encode
(self, buf)¶ Encode data in buf.
Parameters: - buf : buffer-like
Data to be encoded. May be any object supporting the new-style buffer protocol or array.array under Python 2.
Returns: - enc : buffer-like
Encoded data. May be any object supporting the new-style buffer protocol or array.array under Python 2.
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decode
(self, buf, out=None)¶ Decode data in buf.
Parameters: - buf : buffer-like
Encoded data. May be any object supporting the new-style buffer protocol or array.array under Python 2.
- out : buffer-like, optional
Writeable buffer to store decoded data. N.B. if provided, this buffer must be exactly the right size to store the decoded data.
Returns: - dec : buffer-like
Decoded data. May be any object supporting the new-style buffer protocol or array.array under Python 2.
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get_config
(self)¶ Return a dictionary holding configuration parameters for this codec. Must include an ‘id’ field with the codec identifier. All values must be compatible with JSON encoding.
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classmethod
from_config
(cls, config)¶ Instantiate codec from a configuration object.
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