| <!DOCTYPE html> |
| <html> |
| |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script src="resources/compatibility.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| description('Test ChannelMergerNode behavior on dynamic input change.'); |
| window.jsTestIsAsync = true; |
| |
| var renderQuantum = 128; |
| |
| var numberOfChannels = 2; |
| var sampleRate = 44100; |
| var renderDuration = 0.5; |
| var disconnectTime = 0.5 * renderDuration; |
| |
| var audit = Audit.createTaskRunner(); |
| |
| // Task: Check if the merger outputs a silent channel when an input is |
| // disconnected. |
| audit.defineTask('silent-disconnect', function (done) { |
| var context = new OfflineAudioContext(numberOfChannels, renderDuration * sampleRate, sampleRate); |
| var merger = context.createChannelMerger(); |
| var source1 = context.createBufferSource(); |
| var source2 = context.createBufferSource(); |
| |
| // Create and assign a constant buffer. |
| var 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('Channel #0', buffer.getChannelData(0)).beConstantValueOf(1); |
| |
| // Calculate the first zero index in the second channel. |
| var channel1 = buffer.getChannelData(1); |
| var disconnectIndex = disconnectTime * sampleRate; |
| disconnectIndex -= (disconnectIndex) % renderQuantum; |
| var firstZeroIndex = channel1.findIndex(function (element, index) { |
| if (element === 0) |
| return index; |
| }); |
| |
| // The second channel should contain 1, and 0 after the disconnection. |
| Should('Channel #1', channel1).containValues([1, 0]); |
| Should('The index of first zero in the channel #1', firstZeroIndex) |
| .beEqualTo(disconnectIndex); |
| |
| }).then(done); |
| }); |
| |
| audit.defineTask('finish', function (done) { |
| finishJSTest(); |
| done(); |
| }); |
| |
| audit.runTasks(); |
| |
| successfullyParsed = true; |
| </script> |
| </body> |
| |
| </html> |
