| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test AudioBufferSourceNode premature loop stop |
| </title> |
| <script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script src="../resources/audit-util.js"></script> |
| <script src="../resources/audit.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| // Reasonably low sample rate for the optimum test speed. |
| let sampleRate = 8192; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| // Task: Create a buffer with 3 regions filled with constant value of [1, |
| // 2, 3]. Then set a loop range over the second region. Start the loop and |
| // disable it in the middle of looping. Verify the rendered buffer has the |
| // entire content including the looped region. |
| audit.define('premature-loop-stop', (task, should) => { |
| let regionValues = [1, 2, 3]; |
| |
| // The region length is 2 * render quantum size to be able to suspend |
| // the rendering at the half of the region. |
| let regionLength = 256; |
| |
| // The test will repeat the second region 3 times, thus the rendered |
| // audio have the length of 5 * regionLength. |
| let context = new OfflineAudioContext(1, 5 * regionLength, sampleRate); |
| |
| // Create 3 constant buffers of [1, 2, 3] and concatenate them together: |
| // | 1 | 2 | 3 | |
| let testBuffer = context.createBuffer(1, 3 * regionLength, sampleRate); |
| let testChannel = testBuffer.getChannelData(0); |
| for (let i = 0; i < regionValues.length; i++) { |
| let region = |
| createConstantBuffer(context, regionLength, regionValues[i]); |
| testChannel.set(region.getChannelData(0), regionLength * i); |
| ; |
| } |
| |
| let source = context.createBufferSource(); |
| source.connect(context.destination); |
| |
| source.buffer = testBuffer; |
| source.loop = true; |
| |
| // Set loop points over the region 2. |
| source.loopStart = regionLength / sampleRate; |
| source.loopEnd = 2 * regionLength / sampleRate; |
| |
| source.start(); |
| |
| // Disengage the loop at |3.5 * regionLength / sampleRate| which is the |
| // end of 7th rendering quantum and also the half of the third iteration |
| // of region #2. |
| context.suspend(3.5 * regionLength / sampleRate).then(function() { |
| source.loop = false; |
| context.resume(); |
| }); |
| |
| context.startRendering() |
| .then(function(renderedBuffer) { |
| let channel = renderedBuffer.getChannelData(0); |
| |
| // Verify if the rendered buffer has the following structure: |
| // | 1 | 2 | 2 | 2 | 3 | |
| let region1 = channel.subarray(0, regionLength - 1); |
| let region2 = |
| channel.subarray(regionLength, 4 * regionLength - 1); |
| let region3 = |
| channel.subarray(4 * regionLength, 5 * regionLength - 1); |
| |
| should(region1, 'Region #1').beConstantValueOf(1); |
| should(region2, 'Region #2 (looped)').beConstantValueOf(2); |
| should(region3, 'Region #3').beConstantValueOf(3); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
