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Ducking, or volume attenuation, means that Windows automatically reduces volume of all applications when communications device is used. Circumvent auto-ducking behavior of the default communications device on Windows.This means that certain features work better in the installed application than in the browser. Our desktop, iOS, and Android applications, however, make use of a single C++ media engine built on top of the WebRTC native library - specifically tailored to the needs of our users. This means our browser app relies on the WebRTC implementation offered by the browser. WebRTC is available in all modern browsers and also as a native library to embed into applications.ĭiscord’s audio and video features are implemented using WebRTC. WebRTC is a specification for real-time communication comprised of networking, audio, and video components standardized by both World Wide Web Consortium and Internet Engineering Task Force. The only way our team can support all these platforms is to take advantage of code re-use and WebRTC. For example, administrators can disable audio/video for offending participants. Routing audio/video through media servers offers other advantages as well, such as moderation. Routing all your network traffic through Discord servers also ensures that your IP address is never leaked whether you use text, voice, or video - preventing anyone from finding out your IP address and launching a DDoS attack against you. Supporting large group channels (we have seen 1000 people taking turns speaking) requires client-server networking architecture because peer-to-peer networking becomes prohibitively expensive as the number of participants increases. Guiding PrinciplesĮvery audio/video communication in Discord is multiparty. The term “server” will instead be used here to describe our backend infrastructure. This post gives a brief overview of the different technologies Discord uses to make audio/video communications a seamless reality.įor clarity, we will use the term “guild” to represent a collection of users and channels - they are called “servers” in the client. These decisions enabled us to massively scale our operation with a small team and limited resources.

From the very start, we made very conscious engineering and product decisions to keep Discord well suited for voice chat while playing your favorite game with your friends.