soundbank-sample

Sample player AudioNode source extended with automatable transpose, tuning and amp.

Intended for use as a source in soundbank, but it is compatible with any Web Audio API AudioNode set up.

Deprecated

Use audio-slot/sources/sample instead.

Stability

Deprecated: Expect no more changes. Avoid using this module.

Install

$ npm install soundbank-sample

API

var Sample = require('soundbank-sample')

Sample(audioContext)

Returns a source AudioNode.

AudioParams: amp

source.transpose (get/set)

Due to a bug in Chrome, this is not currently an AudioParam, but will be in the future. See https://code.google.com/p/chromium/issues/detail?id=311284

source.tune (get/set)

Due to a bug in Chrome, this is not currently an AudioParam, but will be in the future.

source.mode (get/set)

Set the trigger mode of the audio node: 'hold', 'oneshot', 'loop'

'oneshot' is the same as hold, except the node.start() method returns the time the node.stop() should be called.

source.buffer (get/set)

Specify an instance of AudioBuffer for playback.

source.startOffset (get/set)

Choose the fraction of duration (between 0 and 1) to use as audio in point.

source.endOffset (get/set)

Choose the fraction of duration (between 0 and 1) to use as audio out or loop point.

source.offset (get/set)

Specify the startOffset and endOffset as an array [start, end].

source.start(at)

Schedule note start. Can only be called once. For each event, you need to create a new instance.

source.stop(at)

Schedule note stop.

Example

var Sample = require('soundbank-sample')
 
var audioContext = new AudioContext()
audioContext.sampleCache = {} // see example.js for full details
loadSample('/sounds/hiss.wav', function(err, buffer){
  audioContext.sampleCache['hiss.wav'] = buffer
})
 
var sample = Sample(audioContext)
 
sample.url = 'hiss.wav'
sample.mode = 'oneshot'
 
sample.startOffset = 0.2
sample.tune = 35 // cents
sample.transpose = -3 // semitones
 
// trigger start and end (oneshot will suggest an end time as return value)
var endTime = sample.start(0)
sample.stop(endTime || audioContext.currentTime + 1)

To run the example clone the repo and npm install && npm run example then navigate to http://localhost:9966/.