Using playback function in unity crash

[rouk1]

Required Info
Platform	Windows 10
SDK Version	v2.16.1 }
Language	unity }

Issue Description

• download latest unitypackage (v2.16.1)
• record a .bag file using RealSense Viewer
• play it in any exemple of the unitypackage

Here are the editor logs.
Editor.log
error.log
crash.dump

woops sorry this duplicates #2307

[ogoshen]

Might be related to #2472

When using the processing pipe Unity can crash with:

ArgumentException: GCHandle value belongs to a different domain
  at System.Runtime.InteropServices.GCHandle.op_Explicit (IntPtr value) [0x0002b] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.InteropServices/GCHandle.cs:127 
  at System.Runtime.InteropServices.GCHandle.FromIntPtr (IntPtr value) [0x00000] in /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.InteropServices/GCHandle.cs:172 
  at Intel.RealSense.CustomProcessingBlock.ProcessingBlockFrameCallback (IntPtr f, IntPtr u) [0x00000] in <filename unknown>:0 
  at (wrapper native-to-managed) Intel.RealSense.CustomProcessingBlock:ProcessingBlockFrameCallback (intptr,intptr)
  at (wrapper managed-to-native) Intel.RealSense.NativeMethods:rs2_synthetic_frame_ready (intptr,intptr,object&)
  at Intel.RealSense.FrameSource.FrameReady (IntPtr ptr) [0x00000] in <filename unknown>:0 
  at Intel.RealSense.FrameSource.FrameReady (Intel.RealSense.Frame f) [0x00000] in <filename unknown>:0 
  at RsProcessingPipe.ProcessFrame (Intel.RealSense.Frame frame, FrameSource src) [0x00081] in D:\librealsense\wrappers\unity\Assets\RealSenseSDK2.0\Scripts\RsProcessingPipe.cs:103 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
RsProcessingPipe:ProcessFrame(Frame, FrameSource) (at Assets\RealSenseSDK2.0\Scripts\RsProcessingPipe.cs:110)
Intel.RealSense.CustomProcessingBlock:ProcessingBlockCallback(IntPtr, IntPtr, IntPtr)
Intel.RealSense.NativeMethods:rs2_process_frame(IntPtr, IntPtr, Object&)
Intel.RealSense.CustomProcessingBlock:ProcessFrame(Frame)
RsDevice:RaiseSampleEvent(Frame) (at Assets\RealSenseSDK2.0\Scripts\RsDevice.cs:146)
RsDevice:WaitForFrames() (at Assets\RealSenseSDK2.0\Scripts\RsDevice.cs:159)

Which actually means that GCHandle.FromIntPtr got an invalid pointer, probably because the handle was already freed.

Need to make sure that the CustomProcessingBlock instance stays alive to complete the callback.

[matkatz]

Sorry for the long delay.
The Playback issue was handled by PRs #2646, #2598 which were merged to the master branch and are available on release v2.17.0e should