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Add support for JSEP offer/answer with transceivers

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This change adds support to PeerConnection's CreateOffer/
CreateAnswer/SetLocalDescription/SetRemoteDescription for
Unified Plan SDP mapping to/from RtpTransceivers. This behavior
is enabled using the kUnifiedPlan SDP semantics in the
PeerConnection configuration.

Bug: webrtc:7600
Change-Id: I4b44f5d3690887d387bf9c47eac00db8ec974571
Reviewed-on: https://webrtc-review.googlesource.com/28341
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21442}
This commit is contained in:
Steve Anton
2017-12-22 16:02:54 -08:00
committed by Commit Bot
parent 24de1735b7
commit dcc3c02468
10 changed files with 1518 additions and 155 deletions
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30
pc/rtptransceiver.h
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@ -115,6 +115,33 @@ class RtpTransceiver final
// Returns the backing object for the transceiver's Unified Plan receiver.
rtc::scoped_refptr<RtpReceiverInternal> receiver_internal() const;
// RtpTransceivers are not associated until they have a corresponding media
// section set in SetLocalDescription or SetRemoteDescription. Therefore,
// when setting a local offer we need a way to remember which transceiver was
// used to create which media section in the offer. Storing the mline index
// in CreateOffer is specified in JSEP to allow us to do that.
rtc::Optional<size_t> mline_index() const { return mline_index_; }
void set_mline_index(rtc::Optional<size_t> mline_index) {
mline_index_ = mline_index;
}
// Sets the MID for this transceiver. If the MID is not null, then the
// transceiver is considered "associated" with the media section that has the
// same MID.
void set_mid(const rtc::Optional<std::string>& mid) { mid_ = mid; }
// Sets the intended direction for this transceiver. Intended to be used
// internally over SetDirection since this does not trigger a negotiation
// needed callback.
void set_direction(RtpTransceiverDirection direction) {
direction_ = direction;
}
// Sets the current direction for this transceiver as negotiated in an offer/
// answer exchange. The current direction is null before an answer with this
// transceiver has been set.
void set_current_direction(RtpTransceiverDirection direction);
// According to JSEP rules for SetRemoteDescription, RtpTransceivers can be
// reused only if they were added by AddTrack.
void set_created_by_addtrack(bool created_by_addtrack) {
@ -152,9 +179,8 @@ class RtpTransceiver final
RtpTransceiverDirection direction_ = RtpTransceiverDirection::kInactive;
rtc::Optional<RtpTransceiverDirection> current_direction_;
rtc::Optional<std::string> mid_;
rtc::Optional<size_t> mline_index_;
bool created_by_addtrack_ = false;
// TODO(steveanton): Implement this once there is a mechanism to set the
// current direction.
bool has_ever_been_used_to_send_ = false;
cricket::BaseChannel* channel_ = nullptr;