Class OfflineAudioContext

java.lang.Object

com.codename1.media.audio.BaseAudioContext

com.codename1.media.audio.OfflineAudioContext

public final class OfflineAudioContext
extends BaseAudioContext

Renders an audio graph to memory as fast as the device can, the Web Audio OfflineAudioContext. It needs no audio hardware, so it works on every platform: use it to bounce a mix, pre-render effects, or test a graph.

OfflineAudioContext audio = new OfflineAudioContext(2, 44100, 44100);
OscillatorNode osc = audio.createOscillator();
osc.connect(audio.getDestination());
osc.start();
AudioData oneSecond = audio.startRendering();

Constructor Summary

Constructors

Constructor	Description
OfflineAudioContext(int numberOfChannels, int length, float sampleRate)	Creates an offline context.

Method Summary

Modifier and Type	Method	Description
int	getLength()	The number of frames startRendering() produces.
AudioContextState	getState()	The life cycle state.
AudioData	startRendering()	Renders the whole graph on the calling thread and returns the result.

Methods inherited from class BaseAudioContext

createAnalyser, createAudioProcessor, createAudioProcessor, createBiquadFilter, createBuffer, createBufferSource, createChannelMerger, createChannelMerger, createChannelSplitter, createChannelSplitter, createConstantSource, createConvolver, createDelay, createDelay, createDynamicsCompressor, createGain, createIIRFilter, createMicrophoneSource, createOscillator, createPanner, createPeriodicWave, createPeriodicWave, createStereoPanner, createWaveShaper, decodeAudioData, getCurrentTime, getDestination, getListener, getSampleRate, isAudioProcessorSupported, isHrtfSupported, isMicrophoneSourceSupported

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

OfflineAudioContext

public OfflineAudioContext(int numberOfChannels,
 int length,
 float sampleRate)

Creates an offline context.

Parameters

• numberOfChannels: channels of the result, 1 to 32

• length: frames to render, at least 1

• sampleRate: frames per second, 3000 to 768000

Method Details

getLength

public int getLength()

The number of frames startRendering() produces.

Returns

frames

getState

public AudioContextState getState()

Description copied from class: BaseAudioContext

The life cycle state.

Returns

the state

Specified by:

getState in class BaseAudioContext

startRendering

public AudioData startRendering()

Renders the whole graph on the calling thread and returns the result. onended callbacks run on this thread between render quanta. Do not call it on the EDT for long renders.

Returns

getLength() frames with the destination's channel count

Throws

• IllegalStateException: if rendering was already started