92 lines
4.1 KiB
JavaScript
92 lines
4.1 KiB
JavaScript
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/* global WebAudioTestAPI */
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import 'web-audio-test-api';
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WebAudioTestAPI.setState({
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'OfflineAudioContext#startRendering': 'promise'
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});
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import AudioEffects from '../../../src/lib/audio/audio-effects';
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import RobotEffect from '../../../src/lib/audio/effects/robot-effect';
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import EchoEffect from '../../../src/lib/audio/effects/echo-effect';
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import VolumeEffect from '../../../src/lib/audio/effects/volume-effect';
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describe('Audio Effects manager', () => {
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const audioContext = new AudioContext();
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const audioBuffer = audioContext.createBuffer(1, 400, 44100);
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test('changes buffer length and playback rate for faster effect', () => {
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const audioEffects = new AudioEffects(audioBuffer, 'faster', 0, 1);
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expect(audioEffects.audioContext._.length).toBeLessThan(400);
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});
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test('changes buffer length and playback rate for slower effect', () => {
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const audioEffects = new AudioEffects(audioBuffer, 'slower', 0, 1);
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expect(audioEffects.audioContext._.length).toBeGreaterThan(400);
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});
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test('changes buffer length for echo effect', () => {
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const audioEffects = new AudioEffects(audioBuffer, 'echo', 0, 1);
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expect(audioEffects.audioContext._.length).toBeGreaterThan(400);
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});
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test('updates the trim positions after an effect has changed the length of selection', () => {
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const slowerEffect = new AudioEffects(audioBuffer, 'slower', 0.25, 0.75);
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expect(slowerEffect.adjustedTrimStartSeconds).toEqual(slowerEffect.trimStartSeconds);
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expect(slowerEffect.adjustedTrimEndSeconds).toBeGreaterThan(slowerEffect.trimEndSeconds);
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const fasterEffect = new AudioEffects(audioBuffer, 'faster', 0.25, 0.75);
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expect(fasterEffect.adjustedTrimStartSeconds).toEqual(fasterEffect.trimStartSeconds);
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expect(fasterEffect.adjustedTrimEndSeconds).toBeLessThan(fasterEffect.trimEndSeconds);
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// Some effects do not change the length of the selection
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const fadeEffect = new AudioEffects(audioBuffer, 'fade in', 0.25, 0.75);
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expect(fadeEffect.adjustedTrimStartSeconds).toEqual(fadeEffect.trimStartSeconds);
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// Should be within one millisecond (flooring can change the duration by one sample)
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expect(fadeEffect.adjustedTrimEndSeconds).toBeCloseTo(fadeEffect.trimEndSeconds, 3);
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});
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test.skip('process starts the offline rendering context and returns a promise', () => {
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// @todo haven't been able to get web audio test api to actually run render
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});
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test('reverse effect strictly reverses the samples', () => {
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const fakeSound = [1, 2, 3, 4, 5, 6, 7, 8];
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const fakeBuffer = audioContext.createBuffer(1, 8, 44100);
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const bufferData = fakeBuffer.getChannelData(0);
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fakeSound.forEach((sample, index) => {
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bufferData[index] = sample;
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});
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// Reverse the entire sound
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const reverseAll = new AudioEffects(fakeBuffer, 'reverse', 0, 1);
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expect(Array.from(reverseAll.buffer.getChannelData(0))).toEqual(fakeSound.reverse());
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// Reverse part of the sound
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const reverseSelection = new AudioEffects(fakeBuffer, 'reverse', 0.25, 0.75);
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const selectionReversed = [1, 2, 6, 5, 4, 3, 7, 8];
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expect(Array.from(reverseSelection.buffer.getChannelData(0))).toEqual(selectionReversed);
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});
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});
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describe('Effects', () => {
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let audioContext;
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beforeEach(() => {
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audioContext = new AudioContext();
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});
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test('all effects provide an input and output that are connected', () => {
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const robotEffect = new RobotEffect(audioContext, 0, 1);
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expect(robotEffect.input).toBeInstanceOf(AudioNode);
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expect(robotEffect.output).toBeInstanceOf(AudioNode);
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const echoEffect = new EchoEffect(audioContext, 0, 1);
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expect(echoEffect.input).toBeInstanceOf(AudioNode);
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expect(echoEffect.output).toBeInstanceOf(AudioNode);
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const volumeEffect = new VolumeEffect(audioContext, 0.5, 0, 1);
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expect(volumeEffect.input).toBeInstanceOf(AudioNode);
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expect(volumeEffect.output).toBeInstanceOf(AudioNode);
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});
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});
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