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+id = 2073
+title = "Audio: missing ability to disable microphone input from host?"
+state = "opened"
+created_at = "2024-01-04T21:49:16.262Z"
+closed_at = "n/a"
+labels = ["Audio"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2073"
+host-os = "Windows Server 2022"
+host-arch = "x86_64"
+qemu-version = "QEMU emulator version 8.2.0"
+guest-os = "Windows 10, Fedora 39"
+guest-arch = "x86_64"
+description = """**It appears there is no way to disable the microphone / input to the audio backend device(s).**
+
+
+There are at least two cases where this matters:
+1. The host has no microphone input (e.g. only HDMI audio output with video).
+2. The host has a microphone input, but the user doesn't want the guest VM to have access to the microphone/input.
+
+I tried the option in.channels=0, as that seemed the most obvious way, though that doesn't work.
+
+For -audio dsound, it appears that CLSID_DirectSoundCapture is unconditionally acquired.
+
+There will also be later periodic warning/text outputs from QEMU "Could not create a backend for voice virtio.in", if you're running on a host system with no audio input device.
+
+Adding a couple backend checks for channels > 0 may work well.  Not sure if it matters that audio front end device in the VM still thinks there is an audio input."""
+reproduce = "n/a"
+additional = "n/a"