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ORTC SimulCast
#niku_sushi Jxck
● id: Jxck
● github: Jxck
● twitter: @jxck_
● about: http://jxck.io
● blog: http://jxck.hatenablog.com
● podcast: http://mozaic.fm
● Love: music
Jack
Q: Why ORTC ?
A: long story...
3
4
that’s all thank you !!
ORTC ≒
WebRTC 1.0 +
SimulCast +
MultiStream interop
5
Simulcast
6
SimulCast ?
7
Different Context !!
AVC Simulcast
8
● re-encoding for each client capability, network
○ heavy resource
○ latecy at server
SVC Simulcast
9
● SVC encode at client
○ multi layered video
○ router choose a layer
SVC
10
SVC(scalable video coding)
11
● multi layered coding
○ 1-base layer
○ n-enhancement layer
● parameter
○ Temporal (frame rate)
○ Spatial (resolution)
○ Quality (SNR)
Temporal
12
Spatial
13
Quality
14
layer
● base layer
○ lowest quality for video conference
○ small size
○ error correction
● enhancement layer
○ merge with base layer
○ more size
○ fallback to base layer if lost
● layer choice
○ layer routing server choice
○ negotiation, bandwidth estimation etc
15
ORTC API
16
Over View
17
before / after PeerConnection
18
// before
let peer = new PeerConnection();
// call these during singalling
peer.addStream();
peer.onnegotiationneeded;
peer.createOffer/Answer();
peer.setLocal/RemoteDescription();
peer.onicecandidate;
peer.addIceCandidate();
// ALL API are on PeerConnection Class
before / after PeerConnection
19
// after
let iceGatherer = new RTCIceGatherer(iceGatherOptions);
let iceTransport = new RTCIceTransport(iceGatherer);
let dtlsTransport = new RTCDtlsTransport(iceTransport);
let rtpSender = new RTCRtpSender(mediaStreamTrack, dtlsTransport);
let rtpReceiver = new RTCRtpReceiver(dtlsTransport);
let sendCapas = RTCRtpSender.getCapabilities('video');
let recvCapas = RTCRtpReceiver.getCapabilities('video');
// exchange caps
// ALL API are on each Classes
before / after DataChannel
20
// after
let iceGatherer = new RTCIceGatherer(iceGatherOptions);
let iceTransport = new RTCIceTransport(iceGatherer);
let dtlsTransport = new RTCDtlsTransport(iceTransport);
let sctpTransport = new RTCSctpTransport(dtlsTransport);
let channel = new RTCDataChannel(sctpTransport);
// before
peerConnection.createDataChannel((channel) => {
});
SVC
21
var encodings = [
{
// 低解像度ベースレイヤ(1/2 フレームレート 1/2 解像度)
encodingId: "0",
resolutionScale: 2.0,
framerateScale: 2.0
},
{
// 拡張解像度ベースレイヤ(1/2 フレームレート 1/1 解像度)
encodingId: "E0",
resolutionScale: 1.0,
framerateScale: 2.0
},
{
// 低解像度ベースへの拡張レイヤ (1/1 レート, 1/2 解像度)
encodingId: "1",
dependencyEncodingIds: ["0"],
resolutionScale: 2.0,
framerateScale: 1.0
},
{
// 拡張解像度ベースへの拡張レイヤ (1/1 レート, 1/1 解像度)
encodingId: "E1",
dependencyEncodingIds: ["E0"],
resolutionScale: 1.0,
framerateScale: 1.0
}
];
complicated ?
22
classes based on protocol stack
http://www.slideshare.net/iwashi86/20140801-web-rtcmeetup3r3
WebRTC NV ≒
WebRTC.merge(ORTC)
23
more:
http://jxck.hatenablog.com/entry/ortc-to-webrtcnv
24
have a nice web :)
25
Jack

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ORTC SVC SimulCast

  • 2. ● id: Jxck ● github: Jxck ● twitter: @jxck_ ● about: http://jxck.io ● blog: http://jxck.hatenablog.com ● podcast: http://mozaic.fm ● Love: music Jack
  • 3. Q: Why ORTC ? A: long story... 3
  • 5. ORTC ≒ WebRTC 1.0 + SimulCast + MultiStream interop 5
  • 8. AVC Simulcast 8 ● re-encoding for each client capability, network ○ heavy resource ○ latecy at server
  • 9. SVC Simulcast 9 ● SVC encode at client ○ multi layered video ○ router choose a layer
  • 11. SVC(scalable video coding) 11 ● multi layered coding ○ 1-base layer ○ n-enhancement layer ● parameter ○ Temporal (frame rate) ○ Spatial (resolution) ○ Quality (SNR)
  • 15. layer ● base layer ○ lowest quality for video conference ○ small size ○ error correction ● enhancement layer ○ merge with base layer ○ more size ○ fallback to base layer if lost ● layer choice ○ layer routing server choice ○ negotiation, bandwidth estimation etc 15
  • 18. before / after PeerConnection 18 // before let peer = new PeerConnection(); // call these during singalling peer.addStream(); peer.onnegotiationneeded; peer.createOffer/Answer(); peer.setLocal/RemoteDescription(); peer.onicecandidate; peer.addIceCandidate(); // ALL API are on PeerConnection Class
  • 19. before / after PeerConnection 19 // after let iceGatherer = new RTCIceGatherer(iceGatherOptions); let iceTransport = new RTCIceTransport(iceGatherer); let dtlsTransport = new RTCDtlsTransport(iceTransport); let rtpSender = new RTCRtpSender(mediaStreamTrack, dtlsTransport); let rtpReceiver = new RTCRtpReceiver(dtlsTransport); let sendCapas = RTCRtpSender.getCapabilities('video'); let recvCapas = RTCRtpReceiver.getCapabilities('video'); // exchange caps // ALL API are on each Classes
  • 20. before / after DataChannel 20 // after let iceGatherer = new RTCIceGatherer(iceGatherOptions); let iceTransport = new RTCIceTransport(iceGatherer); let dtlsTransport = new RTCDtlsTransport(iceTransport); let sctpTransport = new RTCSctpTransport(dtlsTransport); let channel = new RTCDataChannel(sctpTransport); // before peerConnection.createDataChannel((channel) => { });
  • 21. SVC 21 var encodings = [ { // 低解像度ベースレイヤ(1/2 フレームレート 1/2 解像度) encodingId: "0", resolutionScale: 2.0, framerateScale: 2.0 }, { // 拡張解像度ベースレイヤ(1/2 フレームレート 1/1 解像度) encodingId: "E0", resolutionScale: 1.0, framerateScale: 2.0 }, { // 低解像度ベースへの拡張レイヤ (1/1 レート, 1/2 解像度) encodingId: "1", dependencyEncodingIds: ["0"], resolutionScale: 2.0, framerateScale: 1.0 }, { // 拡張解像度ベースへの拡張レイヤ (1/1 レート, 1/1 解像度) encodingId: "E1", dependencyEncodingIds: ["E0"], resolutionScale: 1.0, framerateScale: 1.0 } ];
  • 22. complicated ? 22 classes based on protocol stack http://www.slideshare.net/iwashi86/20140801-web-rtcmeetup3r3
  • 25. have a nice web :) 25
  • 26. Jack