start() method on
AudioScheduledSourceNode schedules a sound to begin playback at the specified time. If no time is specified, then the sound begins playing immediately.
AudioScheduledSourceNode.start([when [, offset [, duration]]]);
- The time, in seconds, at which the sound should begin to play. This value is specified in the same time coordinate system as the
AudioContextis using for its
currentTimeattribute. A value of 0 (or omitting the
whenparameter entirely) causes the sound to start playback immediately.
- A floating-point number indicating the offset, in seconds, into the audio buffer where playback should begin. If 0 is passed then the playback will start from the beginning.
- A floating-point number indicating the duration, in seconds, to be played. If no value is passed then the duration will be equal to the length of the audio buffer minus the offset value
- The node has already been started. This error occurs even if the node is no longer running because of a prior call to
- The value specified for
This example demonstrates how to create an
OscillatorNode which is scheduled to start playing in 2 seconds and stop playing 1 second after that. The times are calculated by adding the desired number of seconds to the context's current time stamp returned by
context = new AudioContext(); osc = context.createOscillator(); osc.connect(context.destination); /* Schedule the start and stop times for the oscillator */ osc.start(context.currentTime + 2); osc.stop(context.currentTime + 3);
|Web Audio API
The definition of 'start()' in that specification.
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1. Before version 57, this event was implemented on AudioBufferSourceNode, OscillatorNode, and ConstantSourceNode, which are now children of this class.