| <!doctype html> |
| <meta charset=utf-8> |
| <html> |
| <head> |
| <title>Test setTargetAtTime with start time in the past</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> |
| let audit = Audit.createTaskRunner(); |
| |
| audit.define( |
| { |
| label: 'test', |
| description: 'Test setTargetAtTime with start time in the past' |
| }, |
| (task, should) => { |
| // Use a sample rate that is a power of two to eliminate round-off |
| // in computing the currentTime. |
| let context = new OfflineAudioContext(2, 16384, 16384); |
| let source = new ConstantSourceNode(context); |
| |
| // Suspend the context at this frame so we can synchronously set up |
| // automations. |
| const suspendFrame = 128; |
| |
| let test = new GainNode(context); |
| let reference = new GainNode(context); |
| |
| source.connect(test); |
| source.connect(reference); |
| |
| let merger = new ChannelMergerNode( |
| context, {numberOfInputs: context.destination.channelCount}); |
| test.connect(merger, 0, 0); |
| reference.connect(merger, 0, 1); |
| |
| merger.connect(context.destination); |
| |
| context.suspend(suspendFrame / context.sampleRate) |
| .then(() => { |
| // Call setTargetAtTime with a time in the past |
| test.gain.setTargetAtTime(0.1, 0.5*context.currentTime, 0.1); |
| reference.gain.setTargetAtTime(0.1, context.currentTime, 0.1); |
| }) |
| .then(() => context.resume()); |
| |
| source.start(); |
| |
| context.startRendering() |
| .then(resultBuffer => { |
| let testValue = resultBuffer.getChannelData(0); |
| let referenceValue = resultBuffer.getChannelData(1); |
| |
| // Until the suspendFrame, both should be exactly equal to 1. |
| should( |
| testValue.slice(0, suspendFrame), |
| `Test[0:${suspendFrame - 1}]`) |
| .beConstantValueOf(1); |
| should( |
| referenceValue.slice(0, suspendFrame), |
| `Reference[0:${suspendFrame - 1}]`) |
| .beConstantValueOf(1); |
| |
| // After the suspendFrame, both should be equal (and not |
| // constant) |
| should( |
| testValue.slice(suspendFrame), `Test[${suspendFrame}:]`) |
| .beEqualToArray(referenceValue.slice(suspendFrame)); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
