| <!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 sampleRate = 44100; |
| var numberOfChannels = 2; |
| |
| // The test needs the long render length (20 seconds) to capture the |
| // disconnection which happens after starting the rendering. |
| var renderLength = sampleRate * 20; |
| |
| 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, renderLength, sampleRate |
| ); |
| var merger = context.createChannelMerger(); |
| var source1 = context.createBufferSource(); |
| var source2 = context.createBufferSource(); |
| |
| // Create and assign a mono testing buffer. |
| var bufferDCOffset = createTestingAudioBuffer(context, 1, renderLength); |
| source1.buffer = bufferDCOffset; |
| source2.buffer = bufferDCOffset; |
| |
| // 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(); |
| |
| // When the rendering begins, disconnect |source2| as soon as possible. |
| context.onstatechange = function () { |
| if (context.state === 'running') |
| source2.disconnect(); |
| }; |
| |
| context.startRendering().then(function (buffer) { |
| |
| // The entire first channel of the output should be 1. |
| Should('Channel #0', buffer.getChannelData(0)).beConstantValueOf(1); |
| |
| // The second channel should contain 1, and 0 after the disconnection. |
| Should('Channel #1', buffer.getChannelData(1)).containValues([1, 0]); |
| |
| done(); |
| }); |
| }); |
| |
| audit.defineTask('finish', function (done) { |
| finishJSTest(); |
| done(); |
| }); |
| |
| audit.runTasks( |
| 'silent-disconnect', |
| 'finish' |
| ); |
| |
| successfullyParsed = true; |
| </script> |
| </body> |
| |
| </html> |
