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codecAD.py
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codecAD.py
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"""
codecAD provides python access to the codec support provided by areaDetector/ADSupport
It is meant for use by a callback from an NTNDArray record.
In order to use this code environment variable LD_LIBRARY_PATH must be defined for codec lib.
This file was modified from
https://github.com/areaDetector/ADViewers/blob/master/Python/PY_NTNDA_Viewer/codecAD.py
"""
import sys
import ctypes
import ctypes.util
import os
import numpy as np
class CodecAD:
def __init__(self):
self.__codecName = "none"
self.__data = None
self.__compressRatio = 1.0
self.__saveLibrary = dict()
def __findLibrary(self, name):
lib = self.__saveLibrary.get(name)
if lib != None:
return lib
result = ctypes.util.find_library(name)
if result == None:
return None
if os.name == "nt":
lib = ctypes.windll.LoadLibrary(result)
else:
lib = ctypes.cdll.LoadLibrary(result)
if lib != None:
self.__saveLibrary.update({name: lib})
return lib
def getCodecName(self):
"""
Returns
-------
codecName : str
codecName for the last decompress
"""
return self.__codecName
def getData(self):
"""
Returns
-------
data : numpy array
data for the last decompress
"""
return self.__data
def getCompressRatio(self):
"""
Returns
-------
compressRatio : float
compressRatio for the last decompress
"""
return self.__compressRatio
def decompress(self, data, codec, compressed, uncompressed):
"""
decompress data described by codec.
The arguments are all provided by a callback from an NTNDArray record.
areaDetector/ADCore defines the NTNDArray record.
Parameters
----------
data : Provided by the NTNDArray record.
codec: Provided by the NTNDArray record.
compressed: Provided by the NTNDArray record.
uncompressed: Provided by the NTNDArray record.
Returns
-------
False
No decompression was done.
The original data is not modified.
True
decompression was done.
getCodecName, getData, and getCompressRatio provide the results
"""
self.__codecName = codec["name"]
if len(self.__codecName) == 0:
self.__data = None
self.__codecName = "none"
self.__compressRatio = 1.0
return False
typevalue = codec["parameters"][0]['value']
if typevalue == 1:
dtype = "int8"
elementsize = int(1)
elif typevalue == 5:
dtype = "uint8"
elementsize = int(1)
elif typevalue == 2:
dtype = "int16"
elementsize = int(2)
elif typevalue == 6:
dtype = "uint16"
elementsize = int(2)
elif typevalue == 3:
dtype = "int32"
elementsize = int(4)
elif typevalue == 7:
dtype = "uint32"
elementsize = int(4)
elif typevalue == 4:
dtype = "int64"
elementsize = int(8)
elif typevalue == 8:
dtype = "uint64"
elementsize = int(8)
elif typevalue == 9:
dtype = "float32"
elementsize = int(4)
elif typevalue == 10:
dtype = "float64"
elementsize = int(8)
else:
raise Exception("decompress mapIntToType failed")
if self.__codecName == "blosc":
lib = self.__findLibrary(self.__codecName)
elif self.__codecName == "jpeg":
lib = self.__findLibrary("decompressJPEG")
elif self.__codecName == "lz4" or self.__codecName == "bslz4":
lib = self.__findLibrary("bitshuffle")
else:
lib = None
if lib == None:
raise Exception("shared library " + self.__codecName + " not found")
inarray = bytearray(data)
in_char_array = ctypes.c_ubyte * compressed
out_char_array = ctypes.c_ubyte * uncompressed
outarray = bytearray(uncompressed)
if self.__codecName == "blosc":
lib.blosc_decompress(
in_char_array.from_buffer(inarray),
out_char_array.from_buffer(outarray),
uncompressed,
)
data = np.array(outarray)
data = np.frombuffer(data, dtype=dtype)
elif self.__codecName == "lz4":
lib.LZ4_decompress_fast(
in_char_array.from_buffer(inarray),
out_char_array.from_buffer(outarray),
uncompressed,
)
data = np.array(outarray)
data = np.frombuffer(data, dtype=dtype)
elif self.__codecName == "bslz4":
lib.bshuf_decompress_lz4(
in_char_array.from_buffer(inarray),
out_char_array.from_buffer(outarray),
int(uncompressed / elementsize),
elementsize,
int(0),
)
data = np.array(outarray)
data = np.frombuffer(data, dtype=dtype)
elif self.__codecName == "jpeg":
lib.decompressJPEG(
in_char_array.from_buffer(inarray),
compressed,
out_char_array.from_buffer(outarray),
uncompressed,
)
data = np.array(outarray)
data = data.flatten()
else:
raise Exception(self.__codecName + " is unsupported codec")
self.__compressRatio = uncompressed / compressed
self.__data = data
return True