Another example is getPosition(), which will normally ask the implementation for the current time, except for when a seek is in progress, in which case BasePlayer will return the requested position. This also means the isPlaying() method and corresponding updates can be handled completely by BasePlayer. Each player implementation is decoupled from the actual play() method. The BasePlayer will inform the implementation when it should play or pause, and the implementation will inform the BasePlayer when it is actually playing. Up-to-date state can be retrieved through player methods, and the user is also notified of any changes.įor example, the play() method returns a Promise which may resolve or reject. It delegates tasks to specific implementations, but external communication happens through BasePlayer. The core package provides an abstract BasePlayer class, which provides the player API. ![]() Provide error and performance data, which can be monitored to detect bugs and make more improvements.Should be able to work on devices with constrained memory, such as Chromecast.Handle bugs/differences in browser implementationsĬonfigurable buffer length and cache size.createMediaElementSource (audio ) const gainNode = context. createElement ( 'audio' ) const context = new AudioContext ( ) const sourceNode = context. It is informed of the codec in the content-type header on the response, and it provides an API, which can be used to control playback and to determine if the browser supports the codec:Ĭonst audio = document. This is able to take a URL of an audio file and play it back if the codec is supported by the browser. We’ll cover what we use MSE and the Web Audio API for in a bit, but first, let’s see what the element alone does for us. We are able to gracefully degrade when either the Web Audio API or MSE is missing or there are errors during playback. MSE and the Web Audio API are required for the best experience. The minimum support we require is the element and the ability to play one of our codecs. We make use of the element, Media Source Extensions (MSE), and the Web Audio API. You can find more information about HLS here. ![]() This means the contents of a track are split up into short segments, and we have a separate file (playlist), which contains URLs to all of the segments, along with their corresponding times in the track. Our primary protocol is HLS (HTTP Live Streaming). Our goal is to provide the best possible playback experience using the functionality provided by your browser. What We SupportĪt SoundCloud, we aim to support all modern web browsers, mobile browsers, and IE 11. ![]() We are considering open sourcing it, and this blog post is a technical overview of what we’ve achieved thus far with Maestro. It successfully handles tens of millions of plays per day across, our mobile site, our widget, Chromecast, and our Xbox application. Maestro is a library we have developed to handle all playback across SoundCloud web applications.
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