[webrtc-stats] Input/output resolution and audio energy

henbos has just created a new issue for https://github.com/w3c/webrtc-stats:

== Input/output resolution and audio energy ==
The resokution, audio level, etc. values for sender/receiver/track stats are not clear which part of the pipeline they apply to, see discussions at #271.

The sender is really encoder + packetizer: https://photos.app.goo.gl/fyqGKxYMhM247dK47
The same is true for receiver but in reverse order.

We should consider splitting this up sender/receiver into encoder / decoder dictionaries references by the sender/receiver and put the metrics there. Whether we put them there or keep them inside the sender/receiver/track dictionaries, any frame/audio metrics need to have both "inputBlah" and "outputBlah" versions.

Please view or discuss this issue at https://github.com/w3c/webrtc-stats/issues/353 using your GitHub account