apple: allow sound input and output to be enabled separately - #7902
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Since the input and output streams were merged into a single virtio-sound device, playing audio in the guest also opens the host microphone, which switches Bluetooth headphones into headset mode. Replace the "Enable Sound" toggle with a choice of input only, output only, or both so users can avoid opening the microphone. The existing "Audio" key keeps meaning output and a new "AudioInput" key is added. When "AudioInput" is missing it defaults to "Audio", so existing configs keep both streams and new configs still load on older versions of UTM. Resolves #7875 Assisted-by: Claude:claude-opus-5-5
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Since #7692 merged the Apple backend's sound input and output streams into a single virtio-sound device, playing audio in the guest also opens the host microphone. This switches Bluetooth headphones such as AirPods into headset mode (lower quality audio) whenever the guest plays sound, even if microphone access is denied.
This replaces the "Enable Sound" toggle in the Apple VM settings with a Sound picker: Disabled, Input Only, Output Only, Input and Output. The host microphone stream is only added to the device when input is enabled, so "Output Only" never opens the microphone. The single-device layout from #7692 is kept.
For compatibility, the existing
Audiokey keeps meaning output and a newAudioInputkey is added. WhenAudioInputis missing it defaults to the value ofAudio, so existing VMs keep both input and output, and configs saved by this version still load on older UTM releases. New VMs from the wizard and scripting still default to Input and Output.Resolves #7875
Testing: Tested by a human on macOS 27.0 host (MacBook Air 15-inch, M3) with a macOS 26 guest, using Bluetooth headphones:
The author acknowledges that this change has been tested and/or reviewed by a human in accordance with UTM's AI contribution guidelines.