| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <title>Test convergence of setTargetAtTime</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| <script src='/webaudio/resources/audio-param.js'></script> |
| </head> |
| |
| <body> |
| <script> |
| let audit = Audit.createTaskRunner(); |
| |
| audit.define( |
| {task: 'setTargetAtTime', label: 'convergence handled correctly'}, |
| (task, should) => { |
| // Two channels: |
| // 0 - actual result |
| // 1 - expected result |
| const context = new OfflineAudioContext( |
| {numberOfChannels: 2, sampleRate: 8000, length: 8000}); |
| |
| const merger = new ChannelMergerNode( |
| context, {numberOfChannels: context.destination.channelCount}); |
| merger.connect(context.destination); |
| |
| // Construct test source that will have tha AudioParams being tested |
| // to verify that the AudioParams are working correctly. |
| let src; |
| |
| should( |
| () => src = new ConstantSourceNode(context), |
| 'src = new ConstantSourceNode(context)') |
| .notThrow(); |
| |
| src.connect(merger, 0, 0); |
| src.offset.setValueAtTime(1, 0); |
| |
| const timeConstant = 0.01; |
| |
| // testTime must be at least 10*timeConstant. Also, this must not |
| // lie on a render boundary. |
| const testTime = 0.15; |
| const rampEnd = testTime + 0.001; |
| |
| should( |
| () => src.offset.setTargetAtTime(0.5, 0.01, timeConstant), |
| `src.offset.setTargetAtTime(0.5, 0.01, ${timeConstant})`) |
| .notThrow(); |
| should( |
| () => src.offset.setValueAtTime(0.5, testTime), |
| `src.offset.setValueAtTime(0.5, ${testTime})`) |
| .notThrow(); |
| should( |
| () => src.offset.linearRampToValueAtTime(1, rampEnd), |
| `src.offset.linearRampToValueAtTime(1, ${rampEnd})`) |
| .notThrow(); |
| |
| // The reference node that will generate the expected output. We do |
| // the same automations, except we don't apply the setTarget |
| // automation. |
| const refSrc = new ConstantSourceNode(context); |
| refSrc.connect(merger, 0, 1); |
| |
| refSrc.offset.setValueAtTime(0.5, 0); |
| refSrc.offset.setValueAtTime(0.5, testTime); |
| refSrc.offset.linearRampToValueAtTime(1, rampEnd); |
| |
| src.start(); |
| refSrc.start(); |
| |
| context.startRendering() |
| .then(audio => { |
| const actual = audio.getChannelData(0); |
| const expected = audio.getChannelData(1); |
| |
| // Just verify that the actual output matches the expected |
| // starting a little bit before testTime. |
| let testFrame = |
| Math.floor(testTime * context.sampleRate) - 128; |
| should(actual.slice(testFrame), `output[${testFrame}:]`) |
| .beCloseToArray( |
| expected.slice(testFrame), |
| {relativeThreshold: 4.1724e-6}); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
