Currently, I am converting the hardware decoding Obj-C code to Swift version. (Xcode 8, Swift 3).
I don't know how to set up a dictionary to set up an output option on the screen, also, I don't know how to use it.
The following code works fine in Obj-C project:
// set some values of the sample buffer's attachments
CFArrayRef attachments = CMSampleBufferGetSampleAttachmentsArray(sampleBuffer, YES);
CFMutableDictionaryRef dict = (CFMutableDictionaryRef)CFArrayGetValueAtIndex(attachments, 0);
CFDictionarySetValue(dict, kCMSampleAttachmentKey_DisplayImmediately, kCFBooleanTrue);
I tried the following Swift code, but there was a runtime error:
// i got run-time error
let attachments = CMSampleBufferGetSampleAttachmentsArray(sampleBuffer!, true)
let dict = unsafeBitCast(attachments, to: CFMutableDictionary.self)
CFDictionarySetValue(dict, unsafeBitCast(kCMSampleAttachmentKey_DisplayImmediately, to: UnsafeRawPointer.self), unsafeBitCast(kCFBooleanTrue, to: UnsafeRawPointer.self))
Is it wrong to convert the CFString to UnsafeRawPointer? or Is it wrong to use the CFDictionarySetValue method?
this is my error log.
2016-11-24 16:50:44.458 MyApp[35288:3519253] -[__NSSingleObjectArrayI __setObject:forKey:]: unrecognized selector sent to instance 0x6000002045a0
2016-11-24 16:50:44.466 MyApp[35288:3519253] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSSingleObjectArrayI __setObject:forKey:]: unrecognized selector sent to instance 0x6000002045a0'
*** First throw call stack:
(
0 CoreFoundation 0x000000010b02734b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010a0e421e objc_exception_throw + 48
2 CoreFoundation 0x000000010b096f34 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x000000010afacc15 ___forwarding___ + 1013
4 CoreFoundation 0x000000010afac798 _CF_forwarding_prep_0 + 120
5 MyApp 0x000000010937ac7a _TFC14MyApp16ViewerController21receivedRawVideoFramefT5frameGSaVs5UInt8_4withVs5Int32_T_ + 4890
6 MyApp 0x000000010937d8e2 _TFC14MyApp16ViewerController12MainCallBackfTVs5Int3212callbackCodeS1_8argumentGSqSv_7argSizeS1__T_ + 4242
7 MyApp 0x000000010937daed _TToFC14MyApp16ViewerController12MainCallBackfTVs5Int3212callbackCodeS1_8argumentGSqSv_7argSizeS1__T_ + 61
8 MyApp 0x000000010937dd56 _TTDFC14MyApp16ViewerController12MainCallBackfTVs5Int3212callbackCodeS1_8argumentGSqSv_7argSizeS1__T_ + 70
9 MyApp 0x000000010937dcfe _TTWC14MyApp16ViewerControllerS_18IJCallbackProtocolS_FS1_12MainCallBackfTVs5Int3212callbackCodeS2_8argumentGSqSv_7argSizeS2__T_ + 62
10 MyApp 0x00000001093b22b2 _TFC14MyApp11AppDelegate19MainCallBack_StreamfTVs5Int32S1_GSqSv_S1__T_ + 258
11 MyApp 0x00000001093d26d3 _TFZFC14MyApp19IJStreamCoreWrapper6AttachFTSv2ipSS4portSi_T_U_FTVs5Int32S1_GSqSv_S1_GSqSv__T_ + 355
12 MyApp 0x00000001093d2719 _TToFZFC14MyApp19IJStreamCoreWrapper6AttachFTSv2ipSS4portSi_T_U_FTVs5Int32S1_GSqSv_S1_GSqSv__T_ + 9
13 MyApp 0x00000001093ee176 _ZL8CallbackPN14CStreamManager9Session_TEiPvi + 70
14 MyApp 0x00000001093f09d3 _Z25StreamManagerThread_VideoPv + 3155
15 libsystem_pthread.dylib 0x000000010e494aab _pthread_body + 180
16 libsystem_pthread.dylib 0x000000010e4949f7 _pthread_body + 0
17 libsystem_pthread.dylib 0x000000010e494221 thread_start + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
In the first code snippet, you have a call to CFArrayGetValueAtIndex, which returns a dictionary that you pass to CFDictionarySetValue.
In the second code snippet, you don't call CFArrayGetValueAtIndex. You just pass the array to CFDictionarySetValue. Since an array is not a dictionary, you get a fatal error.