SDL's WASAPI enumeration drops failures silently: EnumAudioEndpoints or
GetCount errors leave the list empty, and a device whose metadata lookup
fails is left out, so an empty list does not prove there is no default
endpoint. The skip now also requires IMMDeviceEnumerator's
GetDefaultAudioEndpoint(eRender, eConsole), the call SDL's default open
makes, to return ERROR_NOT_FOUND. The probe runs only when the wasapi list
is empty.
audio_out_default_open gains wasapi_zero_default (empty WASAPI list, the
probe finds an endpoint, the default is opened) and checks that the probe
runs only for an empty WASAPI list.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
SDL documents that a default open can succeed when SDL_GetNumAudioDevices
returns zero, for instance ALSA whose default PCM works without device
hints. The shortcut now applies only to the wasapi driver, which
enumerates active render endpoints synchronously when the subsystem
starts; with none, its default open has no endpoint to use and fails after
SDL's 8 s retry.
audio_out_default_open runs AudioOut.cpp against a stubbed SDL in four
modes: zero devices on alsa with a working default, zero on wasapi, a
positive count and an unknown count.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Dean