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The start() method of the AudioBufferSourceNode Interface is used to schedule the start of the audio buffer playback.
Syntax
var source = audioCtx.createBufferSource(); source.start(audioCtx.currentTime + 1,3,10);
Examples
The most simple example just starts the audio buffer playing from the beginning — you don't need to specify any parameters in this case:
source.start();
The following more complex example will start playing, after 1 second pause, a 10 second snippet of an audio buffer 3 seconds into the audio duration.
source.start(audioCtx.currentTime + 1,3,10);
Note: For a more complete example showing start() in use, check out our AudioContext.decodeAudioData example, You can also run the code example live, or view the source.
Returns
Void.
Parameters
- when
- The
whenparameter defines when the play will start. Ifwhenrepresents a time in the past, the play will start immediately. If the method is called more than one time, or after a call toAudioBufferSourceNode.stop(), an exception is raised. - offset
- The
offsetparameter, which defaults to0, defines where the playback will start. - duration
- The
durationparameter, which defaults to the length of the asset minus the value ofoffset, defines the length of the portion of the asset to be played.
Specification
| Specification | Status | Comment |
|---|---|---|
| Web Audio API The definition of 'start()' in that specification. |
Working Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 14 webkit | 23 | Not supported | 15 webkit 22 (unprefixed) |
6 webkit |
| Feature | Android | Chrome | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | Not supported | 28 webkit | 25 | 1.2 | Not supported | Not supported | 6 webkit |