| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Test Simple AudioWorklet I/O</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| <script src="/webaudio/resources/audit-util.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| // Arbitrary sample rate |
| const sampleRate = 48000; |
| |
| // The offset to be applied by the worklet to its inputs. |
| const offset = 1; |
| |
| // Location of the worklet's code |
| const filePath = 'processors/add-offset.js'; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| // Context to be used for the tests. |
| let context; |
| |
| audit.define('Initialize worklet', (task, should) => { |
| // Two channels for testing. Channel 0 is the output of the |
| // AudioWorklet. Channel 1 is the oscillator so we can compare |
| // the outputs. |
| context = new OfflineAudioContext( |
| {numberOfChannels: 2, length: sampleRate, sampleRate: sampleRate}); |
| |
| // Load up the code for the worklet. |
| should( |
| context.audioWorklet.addModule(filePath), |
| 'Creation of AudioWorklet') |
| .beResolved() |
| .then(() => task.done()); |
| }); |
| |
| audit.define( |
| {label: 'test', description: 'Simple AudioWorklet I/O'}, |
| (task, should) => { |
| let merger = new ChannelMergerNode( |
| context, {numberOfChannels: context.destination.channelCount}); |
| merger.connect(context.destination); |
| |
| let src = new OscillatorNode(context); |
| |
| let worklet = new AudioWorkletNode( |
| context, 'add-offset-processor', |
| {processorOptions: {offset: offset}}); |
| |
| src.connect(worklet).connect(merger, 0, 0); |
| src.connect(merger, 0, 1); |
| |
| // Start and stop the source. The stop time is fairly arbitrary, |
| // but use a render quantum boundary for simplicity. |
| const stopFrame = RENDER_QUANTUM_FRAMES; |
| src.start(0); |
| src.stop(stopFrame / context.sampleRate); |
| |
| context.startRendering() |
| .then(buffer => { |
| let ch0 = buffer.getChannelData(0); |
| let ch1 = buffer.getChannelData(1); |
| |
| let shifted = ch1.slice(0, stopFrame).map(x => x + offset); |
| |
| // The initial part of the output should be the oscillator |
| // shifted by |offset|. |
| should( |
| ch0.slice(0, stopFrame), |
| `AudioWorklet output[0:${stopFrame - 1}]`) |
| .beCloseToArray(shifted, {absoluteThreshold: 0}); |
| |
| // Output should be constant after the source has stopped. |
| should( |
| ch0.slice(stopFrame), |
| `AudioWorklet output[${stopFrame}:]`) |
| .beConstantValueOf(offset); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
