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Section 9.4: maxTemporalLayers and maxSpatialLayers #130

aboba opened this issue Jul 14, 2014 · 1 comment

Section 9.4: maxTemporalLayers and maxSpatialLayers #130

aboba opened this issue Jul 14, 2014 · 1 comment


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aboba commented Jul 14, 2014

Currently, we have:

unsigned short            maxTemporalLayers = 0;
unsigned short            maxSpatialLayers = 0;

Some questions:

a. Assuming these attributes are only for SVC, how are the maximum number of simulcast layers indicated? ]
b. What happens if a developer tries to exceed the maximum number of simulcast layers (e.g. by doing "poor person's simulcast", creating multiple RTCRtpSender objects)?
c. If maxTemporalLayers = 1 or maxSpatialLayers = 1, isn't this the same as saying that temporal scalability (or spatial scalability) isn't supported?

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aboba commented Jul 15, 2014

a & b. There is capability for the maximum number of simulcast layers. If an excessively large number of simulcast layers is requested, an exception will be thrown.
c. Proposal is to redefine these variables to represent the maximum number of extension layers.

robin-raymond pushed a commit to robin-raymond/ortc that referenced this issue Jul 16, 2014

Added Identity support, as described in Issue w3c#78
Reworked getStats method, as described in Issue w3c#85
Removed ICE restart method described in Issue w3c#93
Addressed CNAME and synchronization context issues described in Issue w3c#94
Fixed WebIDL issues noted in Issue w3c#97
Addressed NITs described in Issue w3c#99
DTLS transport issues fixed as described in Issue w3c#100
ICE transport issues fixed as described in Issue w3c#101
ICE transport controller fixes made as described in Issue w3c#102
Sender and Receiver object fixes made as described in Issue w3c#103
Fixed RTCRtpEncodingParameter default issues described in Issue w3c#104
Fixed 'Big Picture' issues descibed in Issue w3c#105
Fixed RTCRtpParameter default issues described in Issue w3c#106
Added a multi-stream capability, as noted in Issue w3c#108
Removed quality scalability capabilities and parameters, as described in Issue w3c#109
Added scalability examples as requested in Issue w3c#110
Addressed WebRTC 1.0 Data Channel compatibility issue described in Issue w3c#111
Removed header extensions from RTCRtpCodecParameters as described in Issue w3c#113
Addressed RTP/RTCP non-mux issues with IdP as described in Issue w3c#114
Added getParameter methods to RTCRtpSender and RTCRtpReceiver objects, as described in Issue w3c#116
Added layering diagrams as requested in Issue w3c#117
Added a typedef for payload type, as described in Issue w3c#118
Moved onerror from the RTCIceTransport object to the RTCIceListener object as described in Issue w3c#121
Added explanation of Voice Activity Detection (VAD), responding to Issue w3c#129
Clarified the meaning of maxTemporalLayers and maxSpatialLayers, as noted in Issue w3c#130
Added RFC 6051 to the list of header extensions and removed RFC 5450, as noted in Issue w3c#131
Addressed ICE terminology issues, as described in Issue w3c#132
Separated references into Normative and Informative, as noted in Issue w3c#133
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