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Re: [webrtc-stats] scalabilityMode: Same as in getParameters() or not? (#731)

From: Evan Shrubsole via GitHub <sysbot+gh@w3.org>
Date: Wed, 08 Feb 2023 09:57:12 +0000
To: public-webrtc-logs@w3.org
Message-ID: <issue_comment.created-1422329236-1675850231-sysbot+gh@w3.org>
I am unsure as to why L3T1_KEY is missing from the table? It is present in the diagrams https://www.w3.org/TR/webrtc-svc/#L3T1_KEY*

An algorithm for decrementing a spatial layer would be,

  if (svc == LxTy) return L(x-1)Ty
  if (svc == SxTy) return S(x-1)Ty if (x-1 != 1) else L1Ty
  if (svc == LxTy_KEY or LxTy_KEY_SHIFT) return L(x-1)Ty_KEY(_SHIFT) if (x-1 != 1) else L1Ty

and for temporal layers

  if (svc == LxTy) return LxT(y-1)
  if (svc == SxTy) return SxT(y-1)
  if (svc == LxTy_KEY) return LxT(y-1)_KEY
  if (svc == LxTy_KEY_SHIFT) return LxT(y-1)_KEY_SHIFT if (y-1 != 1) else LxT1_KEY

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