Custom SourceBuffers

Overview

Technically speaking SourceBuffers are browser objects allowing JavaScript applications to “append” media segments for them to be decoded at the right time through their attached media element (e.g. <audio> or <video> media elements).

The browser usually already defines audio and video SourceBuffers. This directory allows us to implement more “Custom” SourceBuffers such as text for subtitles.

The implementation of those Custom SourceBuffers is done to be the closest possible to the ones implemented by the browser.

Let’s say for example that we want to implement a custom SourceBuffer for text contents. This custom SourceBuffer will have to:

• update its buffered information
• call the corresponding text parser
• display the right subtitle at the right timecode