However, this doesn’t help with browsers such as Safari on the iPhone and iPad, which don’t support Flash at all.įortunately, HTML5 looks set to make life easier for us developers, thanks to its audio element. The ubiquity of the Flash plugin has helped to a large extent, since Flash makes it easy to embed audio in a way that works with most browsers. Traditionally there are several ways to embed a sound in a web page - some work better than others, and many only work if you happen to be using the right browser with the right plugin. In which a hihat is played every eighth note, and kick and snare are played alternating every quarter, in 4/4 time.Up to now, playing audio in a web browser has been a bit of a black art. Probably the most widely known drumkit pattern is the following: A simple rock drum pattern To demonstrate this, let's set up a simple rhythm track. The Web Audio API lets developers precisely schedule playback. response, function ( buffer ) Dealing with time: playing sounds with rhythm # The following snippet demonstrates loading a sound sample: var dogBarkingBuffer = null Ĭontext. Browser support for different audio formats varies. The API supports loading audio file data in multiple formats, such as WAV, MP3, AAC, OGG and others. The basic approach is to use XMLHttpRequest for fetching sound files. The Web Audio API uses an AudioBuffer for short- to medium-length sounds. Many of the interesting Web Audio API functionality such as creating AudioNodes and decoding audio file data are methods of AudioContext. addEventListener ( 'load', init, false ) Īlert ( 'Web Audio API is not supported in this browser' ) įor older WebKit-based browsers, use the webkit prefix, as with webkitAudioContext. The following snippet creates an AudioContext: var context This routing is described in greater detail at the Web Audio specification.Ī single instance of AudioContext can support multiple sound inputs and complex audio graphs, so we will only need one of these for each audio application we create. This connection doesn't need to be direct, and can go through any number of intermediate AudioNodes which act as processing modules for the audio signal. To produce a sound using the Web Audio API, create one or more sound sources and connect them to the sound destination provided by the AudioContext instance. Getting started with the AudioContext #Īn AudioContext is for managing and playing all sounds. What follows is a gentle introduction to using this powerful API.
The goal of this API is to include capabilities found in modern game audio engines and some of the mixing, processing, and filtering tasks that are found in modern desktop audio production applications. The Web Audio API is a high-level JavaScript API for processing and synthesizing audio in web applications. While audio on the web no longer requires a plugin, the audio tag brings significant limitations for implementing sophisticated games and interactive applications. Applying a simple filter effect to a soundīefore the HTML5 element, Flash or another plugin was required to break the silence of the web.Dealing with time: playing sounds with rhythm.
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