`ServerCodecModeSupport` layered `SCM_HEVC_MAIN10` and never `SCM_AV1_MAIN10`,
on the stated theory that "the GameStream AV1 path is left off until
live-confirmed". But the SDR baseline has always offered AV1 **Main8** to every
client, so that path is either live or it is not — the DEPTH was never the
uncertain part, and the omission only cost AV1-preferring clients their HDR.
Now that the encoders probe 10-bit per codec, each bit is gated on that codec's
own `can_encode_10bit` AND the SDR baseline already advertising it. A box that
does HEVC Main10 but not 10-bit AV1 — or the reverse — advertises the truth
instead of one bit standing in for both.
Two gates follow from that:
* `host_hdr_capable` becomes codec-agnostic (ANY 10-bit-capable codec makes the
host HDR-capable). It was asking about HEVC alone, which would have hidden
HDR entirely on a hypothetical AV1-only-10-bit box;
* the RTSP honor gains the per-session half: a client that negotiated the codec
this host CANNOT do 10-bit with degrades to 8-bit SDR there, rather than
being handed a PQ label over an 8-bit stream. H.264 always lands there —
there is no 10-bit H.264 encode anywhere.
The unit test now pins each bit independently, including the two one-without-
the-other cases a single shared flag got wrong in both directions.
enricobuehler
2a13bc5252