ZVK / stretcher

A time stretching UI using soundtouch-js built for Berklee PULSE.

Stretcher

A time stretching web app using soundtouch-js and wavesurfer-js.

WaveSurfer Documentation:

• wavesurfer-js.org

this.states = [playing, paused, finished] this.backend.source.buffer.extract()

SoundTouch Basics:

The following code exposes soundtouch objects to the browser window:

window.soundtouch = {
    'RateTransposer': RateTransposer,
    'Stretch': Stretch,
    'SimpleFilter': SimpleFilter,
    'SoundTouch': SoundTouch,
    'WebAudioBufferSource': WebAudioBufferSource,
    'getWebAudioNode': getWebAudioNode
};

Here are the required argument types each of these constructors will take:

• RateTransposer createBuffer=bool
• Stretch createBuffers=bool, sampleRate=int
• SimpleFilter sourceSound=obj, pipe=obj
• SoundTouch sampleRate=int
• WebAudioBufferSource buffer=obj
• getWebAudioNode context=obj, filter=obj

Browser Requirements

MP3 Support: Chrome >= 3.0 Safari >= 3.1 Safari Mobile >= 3.2 Opera >= 10.50 Firefox >= 3.5 A note from: Mozilla's Browser Compatibility Table

[5]To avoid patent issues, support for MP3 is not built directly into Firefox. Instead it relies on support from the OS. Firefox supports this format on the following platforms: Windows Vista+ since Firefox 22.0, Android since Firefox 20.0, Firefox OS since Firefox 15.0, Linux since Firefox 26.0 (relies on GStreamer codecs) and OS X 10.7 since Firefox 35.0.