| <!doctype html> |
| <html> |
| <head> |
| <title>Test k-rate AudioParam of AudioWorkletNode</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit-util.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| const audit = Audit.createTaskRunner(); |
| |
| // Use the worklet gain node to test k-rate parameters. |
| const filePath = |
| '../the-audioworklet-interface/processors/gain-processor.js'; |
| |
| // Context for testing |
| let context; |
| |
| audit.define('Create Test Worklet', (task, should) => { |
| |
| // Arbitrary sample rate and duration. |
| const sampleRate = 8000; |
| |
| // Only new a few render quanta to verify things are working. |
| const testDuration = 4 * 128 / sampleRate; |
| |
| context = new OfflineAudioContext({ |
| numberOfChannels: 3, |
| sampleRate: sampleRate, |
| length: testDuration * sampleRate |
| }); |
| |
| should( |
| context.audioWorklet.addModule(filePath), |
| 'Construction of AudioWorklet') |
| .beResolved() |
| .then(() => task.done()); |
| }); |
| |
| audit.define('AudioWorklet k-rate AudioParam', (task, should) => { |
| let src = new ConstantSourceNode(context); |
| |
| let kRateNode = new AudioWorkletNode(context, 'gain'); |
| |
| src.connect(kRateNode).connect(context.destination); |
| |
| let kRateParam = kRateNode.parameters.get('gain'); |
| kRateParam.automationRate = 'k-rate'; |
| |
| // Automate the gain |
| kRateParam.setValueAtTime(0, 0); |
| kRateParam.linearRampToValueAtTime( |
| 10, context.length / context.sampleRate); |
| |
| src.start(); |
| |
| context.startRendering() |
| .then(audioBuffer => { |
| let output = audioBuffer.getChannelData(0); |
| |
| // Verify that the output from the worklet is step-wise |
| // constant. |
| for (let k = 0; k < output.length; k += 128) { |
| should( |
| output.slice(k, k + 128), |
| ` k-rate output [${k}: ${k + 127}]`) |
| .beConstantValueOf(output[k]); |
| } |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
