[ortc] level-asymmetry-allowed and profile-level-id capabilities and settings

aboba has just created a new issue for 
https://github.com/openpeer/ortc:

== level-asymmetry-allowed and profile-level-id capabilities and 
settings ==
In looking at the H.264 SDP used by Mozilla Firefox (see below), I 
noticed the level-asymmetry-allowed parameter (set to 1, to indicate 
that FF supports level asymmetry). 

In the ORTC API, we provide a profileLevelId capability within an 
RTCRtpReceiver (to indicate the maximum profile-level-id that a 
receiver can handle), as well as a profileLevelId setting within an 
RTCRtpSender (to configure the profile-level-id for the sender). 
Currently there is no levelAsymmetryAllowed capability. 

Is there an assumption within the ORTC API that all implementations 
support level asymmetry? Also, since there is no profileLevelId 
capability within an RTCRtpSender, how does a developer detemrine the 
maximum profile-level-id that a sender can support?
================

v=0
o=mozilla...THIS_IS_SDPARTA-47.0a1 5983883222922123900 0 IN IP4 
0.0.0.0
s=-
t=0 0
a=fingerprint:sha-256 
2E:92:F3:20:7D:3F:19:53:37:F5:0E:AB:2B:4B:C9:6A:59:C6:E1:D0:1F:EB:7C:C2:00:E2:CB:05:6C:C1:9A:19
a=group:BUNDLE sdparta_0 sdparta_1
a=ice-options:trickle
a=msid-semantic:WMS *
m=audio 9 UDP/TLS/RTP/SAVPF 109 9 0 8
c=IN IP4 0.0.0.0\r\na=sendrecv
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=ice-pwd:ebd7decbfa8c702b923d585b5144c3e0
a=ice-ufrag:97edf848
a=mid:sdparta_0
a=msid:{df8df6c4-5206-4b75-9e31-1a84dd513abf} 
{31ac2e92-dcbe-4643-b23b-91000ed9dac8}
a=rtcp-mux
a=rtpmap:109 opus/48000/2
a=rtpmap:9 G722/8000/1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=setup:actpass
a=ssrc:3124154477 cname:{6c71c29f-72ff-4cc4-8cb1-eb4e3be55244}
m=video 9 UDP/TLS/RTP/SAVPF 120 126 97
c=IN IP4 0.0.0.0
a=bundle-only
a=sendrecv
a=fmtp:126 
profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1
a=fmtp:97 profile-level-id=42e01f;level-asymmetry-allowed=1
a=fmtp:120 max-fs=12288;max-fr=60
a=ice-pwd:ebd7decbfa8c702b923d585b5144c3e0]
a=ice-ufrag:97edf848
a=mid:sdparta_1
a=msid:{df8df6c4-5206-4b75-9e31-1a84dd513abf} 
{cb329e17-e276-4e85-8923-f01029c9bccc}
a=rtcp-fb:120 nack
a=rtcp-fb:120 nack pli
a=rtcp-fb:120 ccm fir
a=rtcp-fb:126 nack
a=rtcp-fb:126 nack pli
a=rtcp-fb:126 ccm fir
a=rtcp-fb:97 nack
a=rtcp-fb:97 nack pli
a=rtcp-fb:97 ccm fir
a=rtcp-mux
a=rtpmap:120 VP8/90000
a=rtpmap:126 H264/90000
a=rtpmap:97 H264/90000
a=setup:actpass
a=ssrc:19456627 cname:{6c71c29f-72ff-4cc4-8cb1-eb4e3be55244}



Please view or discuss this issue at 
https://github.com/openpeer/ortc/issues/382 using your GitHub account

Received on Saturday, 20 February 2016 19:10:43 UTC