Oxide is responsible for listing the audio capture devices. See
https://bazaar.launchpad.net/~oxide-
developers/oxide/oxide.trunk/view/head:/qt/core/api/oxideqmediacapturedevices.cc#L163
for implementation details.

Chromium exposes the following attributes for each device:

 - id (string)
 - name (string)
 - input (AudioDeviceParameters)
   - sample_rate (int)
   - channel_layout (int)
   - frames_per_buffer (int)
   - effects (int)

The null input device would need to be filtered out based on any
combination of these attributes, while making sure that no other valid
device can be incorrectly filtered out.

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https://bugs.launchpad.net/bugs/1560068

Title:
  Settings report incorrect Microphone device names

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