WebRTC 1.0 sync: H.264 parameters

[aboba]

For WebRTC 1.0, https://tools.ietf.org/html/draft-ietf-rtcweb-video Section 5.2 specifies the relevant parameters for H.264.

Within the ORTC API draft, Section 9.4.2.3 describes the supported H.264 parameters (max-recv-level and packetization-mode).

Rather than including its own set of parameters, the ORTC API should reference draft-ietf-rtcweb-video Section 5.2 and sync up with it.

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The proposed revision is as follows:

9.4.2.3 H.264

The following capabilities are defined for H.264, as noted in [RFC6184] Section 8.1, and [RTCWEB-VIDEO] Section 5.2.

Property Name Values Notes
profile-level-id unsigned long
This parameter, defined in [RFC6184] Section 8.1, is mandatory to support, as noted in [RTCWEB-VIDEO] Section 5.2.

packetization-mode sequence
A sequence of unsigned shorts, each ranging from 0 to 2, indicating supported packetization-mode values. As noted in [RTCWEB-VIDEO] Section 5.2, support for packetization-mode 1 is mandatory.

max-mbps, max-smbps, max-fs, max-cpb, max-dpb, max-br unsigned long
As noted in [RTCWEB-VIDEO] Section 5.2, these optional parameters allow the implementation to specify that they can support certain features of H.264 at higher rates and values than those signalled with profile-level-id.