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openpnp / openpnp-capture

A cross platform video capture library with a focus on machine vision.
MIT License
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OpenPNP MacOS 10.14 - Seg fault when starting the stream with Cap_openStream() #73

Open Amanda-M-UK opened 6 months ago

Amanda-M-UK commented 6 months ago

I have implemented the openpnp-capture library for both Linux and MacOS. Linux works perfectly as does macOS ARM64 and macOS Ventura x86-64. However, when I test on 10.14 (the earliest macOS that my application supports), I get a seg fault when running Cap_openStream().

I initialise the library in the constructor of my class by using:

Cap_setLogLevel(9) Cap_openStream

Afterwards, in another method, I call

m_stream_id = Cap_openStream(m_ctx, m_camera_id, 0);

On macOS 10.14 the line above causes a segmentation fault. Unfortunately, my debugger is not giving me any further information. I have made absolutely sure that I am building the library with CMAKE_OSX_DEPLOYMENT_TARGET=10.14

Is there any help you can offer?

EDIT:

I have traced the seg to the following function in platfromstream.mm

platformDeviceInfo *dinfo = dynamic_cast<platformDeviceInfo*>(device);

EDIT 2

I have stopped the seg fault by changing dynamic_cast<> to use a C cast (platformDeviceInfo*)device

Not sure why this should have stopped the crash though.

EDIT 3

For anybody is else experiencing this problem, the best solution is to _LINK_FLAGS "-Wl,-ldclassic" to set_target_properties() in CMakeLists.txt. Adding the ld_classic statement means that dynamic_cast<> can be used.

Amanda