In the CoreImage Programming guide on the discussion about writing a custom
filter one of the steps described it to write a custom attributes method called
"customAttributes". I used as a template of what I needed to do the
customAttributes method implemented in Apple's sample code for
AVGreenScreenPlayer and so I have implemented my customAttributes method as
follows:
- (NSDictionary *)customAttributes
{
NSDictionary *inputColorProps;
inputColorProps = @{ kCIAttributeClass : [CIColor class],
kCIAttributeDefault : YVSChromaKeyFilterDefaultInputColor,
kCIAttributeType : kCIAttributeTypeOpaqueColor };
NSDictionary *inputDistanceProps;
inputDistanceProps = @{
kCIAttributeClass : [NSNumber class],
kCIAttributeDefault : YVSChromaKeyFilterDefaultInputDistance,
kCIAttributeType : kCIAttributeTypeDistance };
NSDictionary *inputSlopeWidthProps = @{
kCIAttributeClass : [NSNumber class],
kCIAttributeDefault : YVSChromaKeyFilterDefaultInputSlopeWidth,
kCIAttributeType : kCIAttributeTypeDistance };
return @{ kCIInputColorKey : inputColor,
@"inputDistance" : inputDistanceProps,
@"inputSlopeWidth" : inputSlopeWidthProps };
}
Nothing else is described as being needed in relation to attributes in the
CoreImage Programming guide. But when I call where filter is a
YVSChromaKeyFilter object:
NSDictionary *attribs = [filter attributes];
I get an exception thrown:
2014-02-23 16:19:00.623 chromakey[19946:303] *** Terminating app due to
uncaught exception 'NSInvalidArgumentException', reason: '***
-[NSMutableDictionary addEntriesFromDictionary:]: dictionary argument is not an
NSDictionary'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff8608e41c
__exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff808d1e75
objc_exception_throw + 43
2 CoreFoundation 0x00007fff85faabfc
-[NSMutableDictionary addEntriesFromDictionary:] + 492
3 CoreImage 0x00007fff8492d4a9 -[CIFilter
attributes] + 458
4 chromakey 0x000000010000365d
-[YVSChromaKeyImageProcessor run] + 1517
5 chromakey 0x0000000100004115 main + 149
6 libdyld.dylib 0x00007fff839af5fd start + 1
7 ??? 0x000000000000000f 0x0 + 15
)
libc++abi.dylib: terminating with uncaught exception of type NSException
So once again, I feel like I'm missing something. Is there something else I
need to be doing?
Kevin
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