| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| audionode-connect-order.html |
| </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 id="layout-test-code"> |
| let audit = Audit.createTaskRunner(); |
| let sampleRate = 44100.0; |
| let renderLengthSeconds = 0.125; |
| let delayTimeSeconds = 0.1; |
| |
| function createSinWaveBuffer(context, lengthInSeconds, frequency) { |
| let audioBuffer = |
| context.createBuffer(1, lengthInSeconds * sampleRate, sampleRate); |
| |
| let n = audioBuffer.length; |
| let data = audioBuffer.getChannelData(0); |
| |
| for (let i = 0; i < n; ++i) { |
| data[i] = Math.sin(frequency * 2 * Math.PI * i / sampleRate); |
| } |
| |
| return audioBuffer; |
| } |
| |
| audit.define( |
| { |
| label: 'Test connections', |
| description: |
| 'AudioNode connection order doesn\'t trigger assertion errors' |
| }, |
| function(task, should) { |
| // Create offline audio context. |
| let context = new OfflineAudioContext( |
| 1, sampleRate * renderLengthSeconds, sampleRate); |
| let toneBuffer = |
| createSinWaveBuffer(context, renderLengthSeconds, 880); |
| |
| let bufferSource = context.createBufferSource(); |
| bufferSource.buffer = toneBuffer; |
| bufferSource.connect(context.destination); |
| |
| let delay = context.createDelay(); |
| delay.delayTime.value = delayTimeSeconds; |
| |
| // We connect delay node to gain node before anything is connected |
| // to delay node itself. We do this because we try to trigger the |
| // ASSERT which might be fired due to AudioNode connection order, |
| // especially when gain node and delay node is involved e.g. |
| // https://bugs.webkit.org/show_bug.cgi?id=76685. |
| |
| should(() => { |
| let gain = context.createGain(); |
| gain.connect(context.destination); |
| delay.connect(gain); |
| }, 'Connecting nodes').notThrow(); |
| |
| bufferSource.start(0); |
| |
| let promise = context.startRendering(); |
| |
| should(promise, 'OfflineContext startRendering()') |
| .beResolved() |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
