web.audio.OfflineAudioContext — clojure-interop/cljs-web-api 1.0.4

The OfflineAudioContext interface is an web.audio.AudioContext representing an audio-processing graph built from linked together In contrast with a standard web.audio.AudioContext, an OfflineAudioContext render the audio to the device hardware; instead, it generates as fast as it can, and outputs the result to an web.audio.AudioBuffer.

constructor cljs

Constructor.

The OfflineAudioContext() constructor—part of the Web Audio API—creates and returns a new web.audio.OfflineAudioContext object instance, which can then be used to render audio to an web.audio.AudioBuffer rather than to an audio output device.

You can specify the parameters for the OfflineAudioContext() constructor as either the same set of parameters as are inputs into the AudioContext.createBuffer() method, or by passing those parameters in an options object. Either way, the individual parameters are the same.

numberOfChannels An integer specifying the number of channels the resulting web.audio.AudioBuffer should have. length An integer specifying the size of the buffer to create for the audio context, in sample-frames, where one sample-frame is a unit that can contain a single sample of audio data for every channel in the audio data. For example, a 5-second buffer with a sampleRate of 48000Hz would have a length of 5 * 48000 = 240000 sample-frames. sampleRate The sample-rate of the linear audio data in sample-frames per second. All user agents are required to support a range of 22050Hz to 96000Hz, and may support a wider range than that. The most commonly-used rate is 44100Hz, which is the sample rate used by CD audio.

It is important to note that, whereas you can create a new web.audio.AudioContext using the new AudioContext() constructor with no arguments, the OfflineAudioContext() constructor requires three arguments, since it needs to create an AudioBuffer. This works in exactly the same way as when you create a new web.audio.AudioBuffer with the AudioContext.createBuffer() method. For more detail, read Audio buffers: frames, samples and channels from our Basic concepts guide.

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/OfflineAudioContext

length cljs

(length this)

Property.

The length property of the web.audio.OfflineAudioContext interface an integer representing the size of the buffer in sample-frames.

var length = OfflineAudioContext.length;

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/length

oncomplete cljs

(oncomplete this)

Property.

When processing is complete, you might want to use the oncomplete the prompt the user that the audio can now be played, and enable play button.

var offlineAudioCtx = new OfflineAudioContext(); offlineAudioCtx.oncomplete = function() { ... }

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/oncomplete

resume cljs

(resume this & args)

Method.

The resume() method of the web.audio.OfflineAudioContext interface the progression of time in an audio context that has been suspended. promise resolves immediately because the OfflineAudioContext not require the audio hardware. If the context is not currently or the rendering has not started, the promise is rejected with

OfflineAudioContext.resume().then(function() { ... });

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/resume

set-length! cljs

(set-length! this val)

Property.

The length property of the web.audio.OfflineAudioContext interface an integer representing the size of the buffer in sample-frames.

var length = OfflineAudioContext.length;

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/length

set-oncomplete! cljs

(set-oncomplete! this val)

Property.

When processing is complete, you might want to use the oncomplete the prompt the user that the audio can now be played, and enable play button.

var offlineAudioCtx = new OfflineAudioContext(); offlineAudioCtx.oncomplete = function() { ... }

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/oncomplete

start-rendering cljs

(start-rendering this & args)

Method.

The startRendering() method of the web.audio.OfflineAudioContext starts rendering the audio graph, taking into account the current and the current scheduled changes.

`Event-based version:

offlineAudioCtx.startRendering(); offlineAudioCtx.oncomplete = function(e) { // e.renderedBuffer contains the output buffer }

Promise-based version:

offlineAudioCtx.startRendering().then(function(buffer) { // buffer contains the output buffer });`

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/startRendering

suspend cljs

(suspend this suspend-time)

Method.

The suspend() method of the web.audio.OfflineAudioContext interface a suspension of the time progression in the audio context at specified time and returns a promise. This is generally useful the time of manipulating the audio graph synchronously on OfflineAudioContext.

OfflineAudioContext.suspend(suspendTime).then(function() { ... });

See also: https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/suspend