RFC An Offer/Answer Model with Session Description Protocol (SDP), June Canonical URL: ; File formats: . Request for Comments This RFC was published in RFC – Key words for use in RFCs to Indicate Requirement Levels · RFC SDP offer and answer model is described in RFC “An Offer/Answer Model with Session Description Protocol (SDP)”. The SDP negotiator is represented.
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After remote offer has been set in the negotiator, application can rfc 3264 the SDP rgc to generate appropriate answer based on local capability. If the negotiation fails, the active local and remote SDP rfc 3264 not change. In generating answer, the SDP fmtp in the answer candidate may need to be modified by the customized SDP format matching callback rff achieve flexible SDP negotiation, e. If zero, it will prefer to use the local codec order.
Get the current local SDP offer or answer. If application does not want send modified offer, it can just rfc 3264 the active local SDP as the offer. Returns The negotiator state.
Parameters neg The SDP negotiator instance. For example, it can have more or less media lines than the offer, or rfc 3264 order may be different than the offer. For example, an H. Parameters state Negotiator state. Allow media type in the SDP to be changed. Match format in the SDP media offer and answer. The SDP negotiator is ready to negotiate both session descriptors.
As those parameters are format specifics, the negotiation must be done by the format or codec implementation. Application calls this function when it receives SDP offer rfc 3264 remote.
Note that the string buffer must remain valid rfc 3264 the callback is rfc 3264. Generating SDP Answer After remote offer has been set in the negotiator, application can request the SDP negotiator to generate appropriate answer based on local capability.
Application normally calls this function when it receives initial offer from rfc 3264.
SDP Negotiation State Machine (Offer/Answer Model, RFC ) ()
At rfc 3264 stage, application may or may not ready to create an answer. Returns Non-zero if it was remote who sent answer, otherwise rfc 3264 if it was local who supplied answer. If negotiator has initial 32264 capability, application can specify NULL on this argument; in this case, the negotiator will create answer by by negotiating remote offer with initial local capability.
If non-zero, the negotiator will use the rfc 3264 order as specified in remote offer. Parameters neg The negotiator. Get the state string description of the specified state.
Determine whether remote sent answer as opposed to offer on the last negotiation. For example, suppose incoming call has codec order “8 0 3”, while local codec order is “3 0 8”. Application calls this function when it rfc 3264 Rf answer from remote. Calling this function will not change the state of the negotiator. The negotiator rfc 3264 capable to match and reorder local SDP according to remote offer, and create an answer that is suitable for the offer.
Parameters pool Pool to allocate memory. If any previous negotiation process was rfc 3264 i. This state occurs when an offer either local or remote has been provided with answer. This enumeration describes SDP negotiation state. The customized SDP format matching is rfc 3264 when the format identification rfc 3264 a media stream session cannot be simply determined by encoding name and 3624 rate, but also involves one or more format specific parameters, which are specified in SDP fmtp attribute.
This structure contains negotiation state and several SDP session descriptors currently being used in the negotiation.
RFC – An Offer/Answer Model with the Session Description Protocol (SDP)
Create rfc 3264 SDP negotiator with local offer. If non-zero, the negotiator will respond with multiple formats. The pool’s lifetime needs to be 364 for the duration of the negotiator.
Get the currently rfc 3264 local SDP. Parameters pool The memory pool. This specifies the behavior of the SDP negotiator when responding to an offer, whether it should rather use the codec preference as set by remote, or should it rather use the codec preference as specified by local endpoint.
33264 negotiator doesn’t have initial rfc 3264 capability, application MUST specify local rfc 3264 here. In this case, the negotiator will update the stream in the local active media as rrfc too. For example, the initial offer may specify that a stream is sendrecvwhile the answer specifies that remote stream is inactive.
To unregister the callback of specific format, just call this function with parameter cb set rfc 3264 NULL. Negotiate local and remote answer. If the negotiation succeeds i.
An Offer/Answer Model with the Session Description Protocol (SDP)
This state occurs when SDP negotiation rfc 3264 completed, either successfully or not. The declaration of customized SDP format matching callback.
rfcc The format name, e. When generating a new offer, in rfc 3264 case that a media line doesn’t match the active SDP, the new media line will be considered rfc 3264 replace the existing media at the same position.
If remote codec order is preferable, the selected codec will be 8, while if local codec order is preferable, the selected codec will be 3.