Audio Meta Data - sccn/xdf GitHub Wiki
If a stream has the content-type Audio, we recommend that meta-data about the stream adheres to the structure and naming laid out in the following.
<provider> # information about the audio provider
<api> # name of the audio API (e.g. DirectX, JACK, WinMM, ...)
</provider>
<channels> # information about the audio channels
<channel> # information about a single channel (repeated for each)
<label> # channel label (e.g. Left, Right, Center, ...)
</channel>
</channels>