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The Retransmission Queue contain all message fragments (DATA chunks) that have once been sent, but not yet ACKed by the receiver. It will process incoming SACK chunks, which informs it which chunks that the receiver has seen (ACKed) and which that are lost (NACKed), and will retransmit chunks when it's time. If a message has been sent with partial reliability, e.g. to have a limited number of retransmissions or a limited lifetime, the Retransmission Queue may discard a partially sent and expired message and will instruct the receiver that "don't expect this message - it's expired" by sending a FORWARD-TSN chunk. This currently also includes the congestion control algorithm as it's tightly coupled with the state of the retransmission queue. This is a fairly complicated piece of logic which decides how much data that can be in-flight, depending on the available bandwidth. This is not done by any bandwidth estimation, but similar to TCP, where data is sent until it's lost, and then "we dial down a knob" and take it more carefully from here on. Future refactoring will try to separate the logic regarding fragment retransmission and the congestion control algorithm. Bug: webrtc:12614 Change-Id: I8678250abb766e567c3450634686919936ea077b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/214046 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33833}
WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.
Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.
The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.
Development
See here for instructions on how to get started developing with the native code.
Authoritative list of directories that contain the native API header files.
More info
- Official web site: http://www.webrtc.org
- Master source code repo: https://webrtc.googlesource.com/src
- Samples and reference apps: https://github.com/webrtc
- Mailing list: http://groups.google.com/group/discuss-webrtc
- Continuous build: https://ci.chromium.org/p/webrtc/g/ci/console
- Coding style guide
- Code of conduct
- Reporting bugs