[nodes] LdrToHdr: Move import of pyalicevision within functions

Since `pyalicevision`, which is provided outside of Meshroom's repository,
is now needed for all the LdrToHdr nodes, importing `pyalicevision` at
the function level rather than at the file level allows the CI to pass
even if `pyalicevision` is not available.

meshroom/nodes/aliceVision/LdrToHdrCalibration.py

@@ -5,9 +5,6 @@
 import os
 from collections import Counter
 
-from pyalicevision import sfmData as avsfmdata
-from pyalicevision import hdr as avhdr
-
 from meshroom.core import desc
 from meshroom.core.utils import COLORSPACES, VERBOSE_LEVEL
 
@@ -174,6 +171,8 @@ def processChunk(self, chunk):
 
     @classmethod
     def update(cls, node):
+        from pyalicevision import hdr as avhdr
+
         if not isinstance(node.nodeDesc, cls):
             raise ValueError("Node {} is not an instance of type {}".format(node, cls))
         # TODO: use Node version for this test
@@ -251,6 +250,8 @@ def update(cls, node):
 
     @staticmethod
     def getExposure(exp, refIso = 100.0, refFnumber = 1.0):
+        from pyalicevision import sfmData as avsfmdata
+
         fnumber, shutterSpeed, iso = exp
         obj = avsfmdata.ExposureSetting(shutterSpeed, fnumber, iso)
         return obj.getExposure()

meshroom/nodes/aliceVision/LdrToHdrMerge.py

@@ -5,9 +5,6 @@
 import math
 from collections import Counter
 
-from pyalicevision import sfmData as avsfmdata
-from pyalicevision import hdr as avhdr
-
 from meshroom.core import desc
 from meshroom.core.utils import COLORSPACES, EXR_STORAGE_DATA_TYPE, VERBOSE_LEVEL
 
@@ -247,6 +244,8 @@ class LdrToHdrMerge(desc.AVCommandLineNode):
 
     @classmethod
     def update(cls, node):
+        from pyalicevision import hdr as avhdr
+
         if not isinstance(node.nodeDesc, cls):
             raise ValueError("Node {} is not an instance of type {}".format(node, cls))
         # TODO: use Node version for this test
@@ -324,6 +323,8 @@ def update(cls, node):
 
     @staticmethod
     def getExposure(exp, refIso = 100.0, refFnumber = 1.0):
+        from pyalicevision import sfmData as avsfmdata
+
         fnumber, shutterSpeed, iso = exp
         obj = avsfmdata.ExposureSetting(shutterSpeed, fnumber, iso)
         return obj.getExposure()

meshroom/nodes/aliceVision/LdrToHdrSampling.py

@@ -5,9 +5,6 @@
 import os
 from collections import Counter
 
-from pyalicevision import sfmData as avsfmdata
-from pyalicevision import hdr as avhdr
-
 from meshroom.core import desc
 from meshroom.core.utils import COLORSPACES, VERBOSE_LEVEL
 
@@ -199,6 +196,8 @@ def processChunk(self, chunk):
 
     @classmethod
     def update(cls, node):
+        from pyalicevision import hdr as avhdr
+
         if not isinstance(node.nodeDesc, cls):
             raise ValueError("Node {} is not an instance of type {}".format(node, cls))
         # TODO: use Node version for this test
@@ -281,6 +280,8 @@ def update(cls, node):
 
     @staticmethod
     def getExposure(exp, refIso = 100.0, refFnumber = 1.0):
+        from pyalicevision import sfmData as avsfmdata
+
         fnumber, shutterSpeed, iso = exp
         obj = avsfmdata.ExposureSetting(shutterSpeed, fnumber, iso)
         return obj.getExposure()