| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test AudioWorkletNode's basic AudioParam features |
| </title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| let audit = Audit.createTaskRunner(); |
| |
| let sampleRate = 48000; |
| let renderLength = 48000 * 0.6; |
| let context; |
| |
| let filePath = 'processors/gain-processor.js'; |
| |
| // Sets up AudioWorklet and OfflineAudioContext. |
| audit.define('Initializing AudioWorklet and Context', (task, should) => { |
| context = new OfflineAudioContext(1, renderLength, sampleRate); |
| context.audioWorklet.addModule(filePath).then(() => { |
| task.done(); |
| }); |
| }); |
| |
| // Verifies the functionality of AudioParam in AudioWorkletNode by |
| // comparing (canceling out) values from GainNode and AudioWorkletNode |
| // with simple gain computation code by AudioParam. |
| audit.define( |
| 'Verifying AudioParam in AudioWorkletNode', |
| (task, should) => { |
| let constantSourceNode = new ConstantSourceNode(context); |
| let gainNode = new GainNode(context); |
| let inverterNode = new GainNode(context, {gain: -1}); |
| let gainWorkletNode = new AudioWorkletNode(context, 'gain'); |
| let gainWorkletParam = gainWorkletNode.parameters.get('gain'); |
| |
| // Test default value and setter/getter functionality. |
| should(gainWorkletParam.value, |
| 'Default gain value of gainWorkletNode') |
| .beEqualTo(Math.fround(0.707)); |
| gainWorkletParam.value = 0.1; |
| should(gainWorkletParam.value, |
| 'Value of gainWorkletParam after setter = 0.1') |
| .beEqualTo(Math.fround(0.1)); |
| |
| constantSourceNode.connect(gainNode) |
| .connect(inverterNode) |
| .connect(context.destination); |
| constantSourceNode.connect(gainWorkletNode) |
| .connect(context.destination); |
| |
| // With arbitrary times and values, test all possible AudioParam |
| // automations. |
| [gainNode.gain, gainWorkletParam].forEach((param) => { |
| param.setValueAtTime(0, 0); |
| param.linearRampToValueAtTime(1, 0.1); |
| param.exponentialRampToValueAtTime(0.5, 0.2); |
| param.setValueCurveAtTime([0, 2, 0.3], 0.2, 0.1); |
| param.setTargetAtTime(0.01, 0.4, 0.5); |
| }); |
| |
| // Test if the setter works correctly in the middle of rendering. |
| context.suspend(0.5).then(() => { |
| gainNode.gain.value = 1.5; |
| gainWorkletParam.value = 1.5; |
| context.resume(); |
| }); |
| |
| constantSourceNode.start(); |
| context.startRendering().then((renderedBuffer) => { |
| should(renderedBuffer.getChannelData(0), |
| 'The rendered buffer') |
| .beConstantValueOf(0); |
| task.done(); |
| }); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
