Stefan Sayer wrote: >> As requested by the chairs several weeks ago, Jonathan, Enrico and I >> have submitted new versions of the client-to-mixer [1] and >> mixer-to-client [2] audio level indication drafts. Both documents > > Why not use the (so far unused) MSB of the audio level in the > mixer-to-client extension header as voice activity flag (live the V in > client-to-mixer) ? > > While it is possible for the mixer, it may be impossible for the client > to accurately determine voice activity of the participants (e.g. the > spectral information is lost). > > The format would then look like this: > 0 1 2 3 > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | ID | len |V| level 1 |V| level 2 |V| level 3 ... > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > Figure 2: Audio level indicators extension format > > An open question would be whether this is mandatory, or how a mixer > could signal that it is not doing voice activity detection (i.e. V will > be zero all the time). Well, I'd say that could be an optional feature negotiated in the SDP along with the extension header. -- Ciao, Enrico
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