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Diffstat (limited to 'testing/web-platform/tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html')
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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html b/testing/web-platform/tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html new file mode 100644 index 0000000000..ccca103a3b --- /dev/null +++ b/testing/web-platform/tests/webaudio/the-audio-api/the-delaynode-interface/no-dezippering.html @@ -0,0 +1,184 @@ +<!DOCTYPE html> +<html> + <head> + <title> + Test DelayNode Has No Dezippering + </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"> + // The sample rate must be a power of two to avoid any round-off errors in + // computing when to suspend a context on a rendering quantum boundary. + // Otherwise this is pretty arbitrary. + let sampleRate = 16384; + + let audit = Audit.createTaskRunner(); + + audit.define( + {label: 'test0', description: 'Test DelayNode has no dezippering'}, + (task, should) => { + let context = new OfflineAudioContext(1, sampleRate, sampleRate); + + // Simple integer ramp for testing delay node + let buffer = new AudioBuffer( + {length: context.length, sampleRate: context.sampleRate}); + let rampData = buffer.getChannelData(0); + for (let k = 0; k < rampData.length; ++k) { + rampData[k] = k + 1; + } + + // |delay0Frame| is the initial delay in frames. |delay1Frame| is + // the new delay in frames. These must be integers. + let delay0Frame = 64; + let delay1Frame = 16; + + let src = new AudioBufferSourceNode(context, {buffer: buffer}); + let delay = new DelayNode( + context, {delayTime: delay0Frame / context.sampleRate}); + + src.connect(delay).connect(context.destination); + + // After a render quantum, change the delay to |delay1Frame|. + context.suspend(RENDER_QUANTUM_FRAMES / context.sampleRate) + .then(() => { + delay.delayTime.value = delay1Frame / context.sampleRate; + }) + .then(() => context.resume()); + + src.start(); + context.startRendering() + .then(renderedBuffer => { + let renderedData = renderedBuffer.getChannelData(0); + + // The first |delay0Frame| frames should be zero. + should( + renderedData.slice(0, delay0Frame), + 'output[0:' + (delay0Frame - 1) + ']') + .beConstantValueOf(0); + + // Now we have the ramp should show up from the delay. + let ramp0 = + new Float32Array(RENDER_QUANTUM_FRAMES - delay0Frame); + for (let k = 0; k < ramp0.length; ++k) { + ramp0[k] = rampData[k]; + } + + should( + renderedData.slice(delay0Frame, RENDER_QUANTUM_FRAMES), + 'output[' + delay0Frame + ':' + + (RENDER_QUANTUM_FRAMES - 1) + ']') + .beEqualToArray(ramp0); + + // After one rendering quantum, the delay is changed to + // |delay1Frame|. + let ramp1 = + new Float32Array(context.length - RENDER_QUANTUM_FRAMES); + for (let k = 0; k < ramp1.length; ++k) { + // ramp1[k] = 1 + k + RENDER_QUANTUM_FRAMES - delay1Frame; + ramp1[k] = + rampData[k + RENDER_QUANTUM_FRAMES - delay1Frame]; + } + should( + renderedData.slice(RENDER_QUANTUM_FRAMES), + 'output[' + RENDER_QUANTUM_FRAMES + ':]') + .beEqualToArray(ramp1); + }) + .then(() => task.done()); + }); + + audit.define( + {label: 'test1', description: 'Test value setter and setValueAtTime'}, + (task, should) => { + testWithAutomation(should, {prefix: '', threshold: 6.5819e-5}) + .then(() => task.done()); + }); + + audit.define( + {label: 'test2', description: 'Test value setter and modulation'}, + (task, should) => { + testWithAutomation(should, { + prefix: 'With modulation: ', + modulator: true + }).then(() => task.done()); + }); + + // Compare .value setter with setValueAtTime, Optionally allow modulation + // of |delayTime|. + function testWithAutomation(should, options) { + let prefix = options.prefix; + // Channel 0 is the output of delay node using the setter and channel 1 + // is the output using setValueAtTime. + let context = new OfflineAudioContext(2, sampleRate, sampleRate); + + let merger = new ChannelMergerNode( + context, {numberOfInputs: context.destination.channelCount}); + merger.connect(context.destination); + + let src = new OscillatorNode(context); + + // |delay0Frame| is the initial delay value in frames. |delay1Frame| is + // the new delay in frames. The values here are constrained only by the + // constraints for a DelayNode. These are pretty arbitrary except we + // wanted them to be fractional so as not be on a frame boundary to + // test interpolation compared with |setValueAtTime()|.. + let delay0Frame = 3.1; + let delay1Frame = 47.2; + + let delayTest = new DelayNode( + context, {delayTime: delay0Frame / context.sampleRate}); + let delayRef = new DelayNode( + context, {delayTime: delay0Frame / context.sampleRate}); + + src.connect(delayTest).connect(merger, 0, 0); + src.connect(delayRef).connect(merger, 0, 1); + + if (options.modulator) { + // Fairly arbitrary modulation of the delay time, with a peak + // variation of 10 ms. + let mod = new OscillatorNode(context, {frequency: 1000}); + let modGain = new GainNode(context, {gain: .01}); + mod.connect(modGain); + modGain.connect(delayTest.delayTime); + modGain.connect(delayRef.delayTime); + mod.start(); + } + + // The time at which the delay time of |delayTest| node will be + // changed. This MUST be on a render quantum boundary, but is + // otherwise arbitrary. + let changeTime = 3 * RENDER_QUANTUM_FRAMES / context.sampleRate; + + // Schedule the delay change on |delayRef| and also apply the value + // setter for |delayTest| at |changeTime|. + delayRef.delayTime.setValueAtTime( + delay1Frame / context.sampleRate, changeTime); + context.suspend(changeTime) + .then(() => { + delayTest.delayTime.value = delay1Frame / context.sampleRate; + }) + .then(() => context.resume()); + + src.start(); + + return context.startRendering().then(renderedBuffer => { + let actual = renderedBuffer.getChannelData(0); + let expected = renderedBuffer.getChannelData(1); + + let match = should(actual, prefix + '.value setter output') + .beCloseToArray( + expected, {absoluteThreshold: options.threshold}); + should( + match, + prefix + '.value setter output matches setValueAtTime output') + .beTrue(); + }); + } + + audit.run(); + </script> + </body> +</html> |