Create a MediaTransportState enum and add a state callback to MediaTransport.
Bug: webrtc:9719
Change-Id: Icf7004be5e3a2784fccc1d910c8b77ea3b3d5156
Reviewed-on: https://webrtc-review.googlesource.com/c/108501
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Peter Slatala <psla@webrtc.org>
Commit-Queue: Bjorn Mellem <mellem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25438}diff --git a/api/media_transport_interface.h b/api/media_transport_interface.h
index 6580370..ca26851 100644
--- a/api/media_transport_interface.h
+++ b/api/media_transport_interface.h
@@ -209,6 +209,25 @@
virtual void OnKeyFrameRequested(uint64_t channel_id) = 0;
};
+// State of the media transport. Media transport begins in the pending state.
+// It transitions to writable when it is ready to send media. It may transition
+// back to pending if the connection is blocked. It may transition to closed at
+// any time. Closed is terminal: a transport will never re-open once closed.
+enum class MediaTransportState {
+ kPending,
+ kWritable,
+ kClosed,
+};
+
+// Callback invoked whenever the state of the media transport changes.
+class MediaTransportStateCallback {
+ public:
+ virtual ~MediaTransportStateCallback() = default;
+
+ // Invoked whenever the state of the media transport changes.
+ virtual void OnStateChanged(MediaTransportState state) = 0;
+};
+
// Media transport interface for sending / receiving encoded audio/video frames
// and receiving bandwidth estimate update from congestion control.
class MediaTransportInterface {
@@ -250,6 +269,14 @@
virtual void SetTargetTransferRateObserver(
webrtc::TargetTransferRateObserver* observer) = 0;
+ // Sets a state observer callback. Before media transport is destroyed, the
+ // callback must be unregistered by setting it to nullptr.
+ // A newly registered callback will be called with the current state.
+ // Media transport does not invoke this callback concurrently.
+ // TODO(mellem): Make this pure virtual once all implementations support it.
+ virtual void SetMediaTransportStateCallback(
+ MediaTransportStateCallback* callback) {}
+
// TODO(sukhanov): RtcEventLogs.
};
