| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| audiochannelmerger-disconnect.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 renderQuantum = 128; |
| |
| let numberOfChannels = 2; |
| let sampleRate = 44100; |
| let renderDuration = 0.5; |
| let disconnectTime = 0.5 * renderDuration; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| // Task: Check if the merger outputs a silent channel when an input is |
| // disconnected. |
| audit.define('silent-disconnect', (task, should) => { |
| let context = new OfflineAudioContext( |
| numberOfChannels, renderDuration * sampleRate, sampleRate); |
| let merger = context.createChannelMerger(); |
| let source1 = context.createBufferSource(); |
| let source2 = context.createBufferSource(); |
| |
| // Create and assign a constant buffer. |
| let bufferDCOffset = createConstantBuffer(context, 1, 1); |
| source1.buffer = source2.buffer = bufferDCOffset; |
| source1.loop = source2.loop = true; |
| |
| // Connect the output of source into the 4th input of merger. The merger |
| // should produce 6 channel output. |
| source1.connect(merger, 0, 0); |
| source2.connect(merger, 0, 1); |
| merger.connect(context.destination); |
| source1.start(); |
| source2.start(); |
| |
| // Schedule the disconnection of |source2| at the half of render |
| // duration. |
| context.suspend(disconnectTime).then(function() { |
| source2.disconnect(); |
| context.resume(); |
| }); |
| |
| context.startRendering() |
| .then(function(buffer) { |
| // The entire first channel of the output should be 1. |
| should(buffer.getChannelData(0), 'Channel #0') |
| .beConstantValueOf(1); |
| |
| // Calculate the first zero index in the second channel. |
| let channel1 = buffer.getChannelData(1); |
| let disconnectIndex = disconnectTime * sampleRate; |
| disconnectIndex = renderQuantum * |
| Math.floor( |
| (disconnectIndex + renderQuantum - 1) / renderQuantum); |
| let firstZeroIndex = channel1.findIndex(function(element, index) { |
| if (element === 0) |
| return index; |
| }); |
| |
| // The second channel should contain 1, and 0 after the |
| // disconnection. |
| should(channel1, 'Channel #1').containValues([1, 0]); |
| should( |
| firstZeroIndex, 'The index of first zero in the channel #1') |
| .beEqualTo(disconnectIndex); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
