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When no source devices are connected, the default source string can contain a sink name. If the default source and sink match, it will be caught as a sink device first and handled correctly, but if the default sink/source don't match, which happens when the sink is an HDMI output and the source is still an onboard audio chipset output name, an assert can result since the requested source device won't be flagged as a capture device. Rather than asserting, simply don't assign default devices that don't match the correct capabilities, as it's not an uncommon scenario and can be handled gracefully. Additionally, if asserting is a no-op in release mode, sinks can be returned as sources and vice versa, which is incorrect.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md. If you are migrating to SDL 3.0 from SDL 2.0, the changes are extensively documented in README-migration.md.
Enjoy!
Sam Lantinga (slouken@libsdl.org)