| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test CancelValuesAndHoldAtTime |
| </title> |
| <script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script src="../resources/audio-param.js"></script> |
| <script src="../resources/audit-util.js"></script> |
| <script src="../resources/audit.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| let sampleRate = 48000; |
| let renderDuration = 0.5; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| // The first few tasks test the cancellation of each relevant automation |
| // function. For the test, a simple linear ramp from 0 to 1 is used to |
| // start things off. Then the automation to be tested is scheduled and |
| // cancelled. |
| |
| audit.define( |
| {label: 'linear', description: 'Cancel linearRampToValueAtTime'}, |
| function(task, should) { |
| cancelTest(should, linearRampTest('linearRampToValueAtTime'), { |
| valueThreshold: 8.3998e-5, |
| curveThreshold: 0 |
| }).then(task.done.bind(task)); |
| }); |
| |
| audit.define( |
| {label: 'exponential', description: 'Cancel exponentialRampAtTime'}, |
| function(task, should) { |
| // Cancel an exponential ramp. The thresholds are experimentally |
| // determined. |
| cancelTest(should, function(g, v0, t0, cancelTime) { |
| // Initialize values to 0. |
| g[0].gain.setValueAtTime(0, 0); |
| g[1].gain.setValueAtTime(0, 0); |
| // Schedule a short linear ramp to start things off. |
| g[0].gain.linearRampToValueAtTime(v0, t0); |
| g[1].gain.linearRampToValueAtTime(v0, t0); |
| |
| // After the linear ramp, schedule an exponential ramp to the end. |
| // (This is the event that will be be cancelled.) |
| let v1 = 0.001; |
| let t1 = renderDuration; |
| |
| g[0].gain.exponentialRampToValueAtTime(v1, t1); |
| g[1].gain.exponentialRampToValueAtTime(v1, t1); |
| |
| expectedConstant = Math.fround( |
| v0 * Math.pow(v1 / v0, (cancelTime - t0) / (t1 - t0))); |
| return { |
| expectedConstant: expectedConstant, |
| autoMessage: 'exponentialRampToValue(' + v1 + ', ' + t1 + ')', |
| summary: 'exponentialRampToValueAtTime', |
| }; |
| }, { |
| valueThreshold: 1.8664e-6, |
| curveThreshold: 5.9605e-8 |
| }).then(task.done.bind(task)); |
| }); |
| |
| audit.define( |
| {label: 'setTarget', description: 'Cancel setTargetAtTime'}, |
| function(task, should) { |
| // Cancel a setTarget event. |
| cancelTest(should, function(g, v0, t0, cancelTime) { |
| // Initialize values to 0. |
| g[0].gain.setValueAtTime(0, 0); |
| g[1].gain.setValueAtTime(0, 0); |
| // Schedule a short linear ramp to start things off. |
| g[0].gain.linearRampToValueAtTime(v0, t0); |
| g[1].gain.linearRampToValueAtTime(v0, t0); |
| |
| // At the end of the linear ramp, schedule a setTarget. (This is |
| // the event that will be cancelled.) |
| let v1 = 0; |
| let t1 = t0; |
| let timeConstant = 0.05; |
| |
| g[0].gain.setTargetAtTime(v1, t1, timeConstant); |
| g[1].gain.setTargetAtTime(v1, t1, timeConstant); |
| |
| expectedConstant = Math.fround( |
| v1 + (v0 - v1) * Math.exp(-(cancelTime - t0) / timeConstant)); |
| return { |
| expectedConstant: expectedConstant, |
| autoMessage: 'setTargetAtTime(' + v1 + ', ' + t1 + ', ' + |
| timeConstant + ')', |
| summary: 'setTargetAtTime', |
| }; |
| }, { |
| valueThreshold: 4.5267e-7, // 1.1317e-7, |
| curveThreshold: 0 |
| }).then(task.done.bind(task)); |
| }); |
| |
| audit.define( |
| {label: 'setValueCurve', description: 'Cancel setValueCurveAtTime'}, |
| function(task, should) { |
| // Cancel a setValueCurve event. |
| cancelTest(should, function(g, v0, t0, cancelTime) { |
| // Initialize values to 0. |
| g[0].gain.setValueAtTime(0, 0); |
| g[1].gain.setValueAtTime(0, 0); |
| // Schedule a short linear ramp to start things off. |
| g[0].gain.linearRampToValueAtTime(v0, t0); |
| g[1].gain.linearRampToValueAtTime(v0, t0); |
| |
| // After the linear ramp, schedule a setValuesCurve. (This is the |
| // event that will be cancelled.) |
| let v1 = 0; |
| let duration = renderDuration - t0; |
| |
| // For simplicity, a 2-point curve so we get a linear interpolated |
| // result. |
| let curve = Float32Array.from([v0, 0]); |
| |
| g[0].gain.setValueCurveAtTime(curve, t0, duration); |
| g[1].gain.setValueCurveAtTime(curve, t0, duration); |
| |
| let index = |
| Math.floor((curve.length - 1) / duration * (cancelTime - t0)); |
| |
| let curvePointsPerFrame = |
| (curve.length - 1) / duration / sampleRate; |
| let virtualIndex = |
| (cancelTime - t0) * sampleRate * curvePointsPerFrame; |
| |
| let delta = virtualIndex - index; |
| expectedConstant = curve[0] + (curve[1] - curve[0]) * delta; |
| return { |
| expectedConstant: expectedConstant, |
| autoMessage: 'setValueCurveAtTime([' + curve + '], ' + t0 + |
| ', ' + duration + ')', |
| summary: 'setValueCurveAtTime', |
| }; |
| }, { |
| valueThreshold: 9.5368e-9, |
| curveThreshold: 0 |
| }).then(task.done.bind(task)); |
| }); |
| |
| audit.define( |
| { |
| label: 'setValueCurve after end', |
| description: 'Cancel setValueCurveAtTime after the end' |
| }, |
| function(task, should) { |
| cancelTest(should, function(g, v0, t0, cancelTime) { |
| // Initialize values to 0. |
| g[0].gain.setValueAtTime(0, 0); |
| g[1].gain.setValueAtTime(0, 0); |
| // Schedule a short linear ramp to start things off. |
| g[0].gain.linearRampToValueAtTime(v0, t0); |
| g[1].gain.linearRampToValueAtTime(v0, t0); |
| |
| // After the linear ramp, schedule a setValuesCurve. (This is the |
| // event that will be cancelled.) Make sure the curve ends before |
| // the cancellation time. |
| let v1 = 0; |
| let duration = cancelTime - t0 - 0.125; |
| |
| // For simplicity, a 2-point curve so we get a linear interpolated |
| // result. |
| let curve = Float32Array.from([v0, 0]); |
| |
| g[0].gain.setValueCurveAtTime(curve, t0, duration); |
| g[1].gain.setValueCurveAtTime(curve, t0, duration); |
| |
| expectedConstant = curve[1]; |
| return { |
| expectedConstant: expectedConstant, |
| autoMessage: 'setValueCurveAtTime([' + curve + '], ' + t0 + |
| ', ' + duration + ')', |
| summary: 'setValueCurveAtTime', |
| }; |
| }, { |
| valueThreshold: 0, |
| curveThreshold: 0 |
| }).then(task.done.bind(task)); |
| }); |
| |
| // Special case where we schedule a setTarget and there is no earlier |
| // automation event. This tests that we pick up the starting point |
| // correctly from the last setting of the AudioParam value attribute. |
| |
| |
| audit.define( |
| { |
| label: 'initial setTarget', |
| description: 'Cancel with initial setTargetAtTime' |
| }, |
| function(task, should) { |
| cancelTest(should, function(g, v0, t0, cancelTime) { |
| let v1 = 0; |
| let timeConstant = 0.1; |
| g[0].gain.value = 1; |
| g[0].gain.setTargetAtTime(v1, t0, timeConstant); |
| g[1].gain.value = 1; |
| g[1].gain.setTargetAtTime(v1, t0, timeConstant); |
| |
| let expectedConstant = Math.fround( |
| v1 + (v0 - v1) * Math.exp(-(cancelTime - t0) / timeConstant)); |
| |
| return { |
| expectedConstant: expectedConstant, |
| autoMessage: 'setTargetAtTime(' + v1 + ', ' + t0 + ', ' + |
| timeConstant + ')', |
| summary: 'Initial setTargetAtTime', |
| }; |
| }, { |
| valueThreshold: 1.2320e-6, |
| curveThreshold: 0 |
| }).then(task.done.bind(task)); |
| }); |
| |
| // Test automations scheduled after the call to cancelAndHoldAtTime. |
| // Very similar to the above tests, but we also schedule an event after |
| // cancelAndHoldAtTime and verify that curve after cancellation has |
| // the correct values. |
| |
| audit.define( |
| { |
| label: 'post cancel: Linear', |
| description: 'LinearRamp after cancelling' |
| }, |
| function(task, should) { |
| // Run the cancel test using a linearRamp as the event to be |
| // cancelled. Then schedule another linear ramp after the |
| // cancellation. |
| cancelTest( |
| should, |
| linearRampTest('Post cancellation linearRampToValueAtTime'), |
| {valueThreshold: 8.3998e-5, curveThreshold: 0}, |
| function(g, cancelTime, expectedConstant) { |
| // Schedule the linear ramp on g[0], and do the same for g[2], |
| // using the starting point given by expectedConstant. |
| let v2 = 2; |
| let t2 = cancelTime + 0.125; |
| g[0].gain.linearRampToValueAtTime(v2, t2); |
| g[2].gain.setValueAtTime(expectedConstant, cancelTime); |
| g[2].gain.linearRampToValueAtTime(v2, t2); |
| return { |
| constantEndTime: cancelTime, |
| message: 'Post linearRamp(' + v2 + ', ' + t2 + ')' |
| }; |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define( |
| { |
| label: 'post cancel: Exponential', |
| description: 'ExponentialRamp after cancelling' |
| }, |
| function(task, should) { |
| // Run the cancel test using a linearRamp as the event to be |
| // cancelled. Then schedule an exponential ramp after the |
| // cancellation. |
| cancelTest( |
| should, |
| linearRampTest('Post cancel exponentialRampToValueAtTime'), |
| {valueThreshold: 8.3998e-5, curveThreshold: 0}, |
| function(g, cancelTime, expectedConstant) { |
| // Schedule the exponential ramp on g[0], and do the same for |
| // g[2], using the starting point given by expectedConstant. |
| let v2 = 2; |
| let t2 = cancelTime + 0.125; |
| g[0].gain.exponentialRampToValueAtTime(v2, t2); |
| g[2].gain.setValueAtTime(expectedConstant, cancelTime); |
| g[2].gain.exponentialRampToValueAtTime(v2, t2); |
| return { |
| constantEndTime: cancelTime, |
| message: 'Post exponentialRamp(' + v2 + ', ' + t2 + ')' |
| }; |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('post cancel: ValueCurve', function(task, should) { |
| // Run the cancel test using a linearRamp as the event to be cancelled. |
| // Then schedule a setValueCurve after the cancellation. |
| cancelTest( |
| should, linearRampTest('Post cancel setValueCurveAtTime'), |
| {valueThreshold: 8.3998e-5, curveThreshold: 0}, |
| function(g, cancelTime, expectedConstant) { |
| // Schedule the exponential ramp on g[0], and do the same for |
| // g[2], using the starting point given by expectedConstant. |
| let t2 = cancelTime + 0.125; |
| let duration = 0.125; |
| let curve = Float32Array.from([.125, 2]); |
| g[0].gain.setValueCurveAtTime(curve, t2, duration); |
| g[2].gain.setValueAtTime(expectedConstant, cancelTime); |
| g[2].gain.setValueCurveAtTime(curve, t2, duration); |
| return { |
| constantEndTime: cancelTime, |
| message: 'Post setValueCurve([' + curve + '], ' + t2 + ', ' + |
| duration + ')', |
| errorThreshold: 8.3998e-5 |
| }; |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('post cancel: setTarget', function(task, should) { |
| // Run the cancel test using a linearRamp as the event to be cancelled. |
| // Then schedule a setTarget after the cancellation. |
| cancelTest( |
| should, linearRampTest('Post cancel setTargetAtTime'), |
| {valueThreshold: 8.3998e-5, curveThreshold: 0}, |
| function(g, cancelTime, expectedConstant) { |
| // Schedule the exponential ramp on g[0], and do the same for |
| // g[2], using the starting point given by expectedConstant. |
| let v2 = 0.125; |
| let t2 = cancelTime + 0.125; |
| let timeConstant = 0.1; |
| g[0].gain.setTargetAtTime(v2, t2, timeConstant); |
| g[2].gain.setValueAtTime(expectedConstant, cancelTime); |
| g[2].gain.setTargetAtTime(v2, t2, timeConstant); |
| return { |
| constantEndTime: cancelTime + 0.125, |
| message: 'Post setTargetAtTime(' + v2 + ', ' + t2 + ', ' + |
| timeConstant + ')', |
| errorThreshold: 8.4037e-5 |
| }; |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('post cancel: setValue', function(task, should) { |
| // Run the cancel test using a linearRamp as the event to be cancelled. |
| // Then schedule a setTarget after the cancellation. |
| cancelTest( |
| should, linearRampTest('Post cancel setValueAtTime'), |
| {valueThreshold: 8.3998e-5, curveThreshold: 0}, |
| function(g, cancelTime, expectedConstant) { |
| // Schedule the exponential ramp on g[0], and do the same for |
| // g[2], using the starting point given by expectedConstant. |
| let v2 = 0.125; |
| let t2 = cancelTime + 0.125; |
| g[0].gain.setValueAtTime(v2, t2); |
| g[2].gain.setValueAtTime(expectedConstant, cancelTime); |
| g[2].gain.setValueAtTime(v2, t2); |
| return { |
| constantEndTime: cancelTime + 0.125, |
| message: 'Post setValueAtTime(' + v2 + ', ' + t2 + ')' |
| }; |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('cancel future setTarget', (task, should) => { |
| const context = |
| new OfflineAudioContext(1, renderDuration * sampleRate, sampleRate); |
| const src = new ConstantSourceNode(context); |
| src.connect(context.destination); |
| |
| src.offset.setValueAtTime(0.5, 0); |
| src.offset.setTargetAtTime(0, 0.75 * renderDuration, 0.1); |
| // Now cancel the effect of the setTarget. |
| src.offset.cancelAndHoldAtTime(0.5 * renderDuration); |
| |
| src.start(); |
| context.startRendering() |
| .then(buffer => { |
| let actual = buffer.getChannelData(0); |
| // Because the setTarget was cancelled, the output should be a |
| // constant. |
| should(actual, 'After cancelling future setTarget event, output') |
| .beConstantValueOf(0.5); |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('cancel setTarget now', (task, should) => { |
| const context = |
| new OfflineAudioContext(1, renderDuration * sampleRate, sampleRate); |
| const src = new ConstantSourceNode(context); |
| src.connect(context.destination); |
| |
| src.offset.setValueAtTime(0.5, 0); |
| src.offset.setTargetAtTime(0, 0.5 * renderDuration, 0.1); |
| // Now cancel the effect of the setTarget. |
| src.offset.cancelAndHoldAtTime(0.5 * renderDuration); |
| |
| src.start(); |
| context.startRendering() |
| .then(buffer => { |
| let actual = buffer.getChannelData(0); |
| // Because the setTarget was cancelled, the output should be a |
| // constant. |
| should( |
| actual, |
| 'After cancelling setTarget event starting now, output') |
| .beConstantValueOf(0.5); |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('cancel future setValueCurve', (task, should) => { |
| const context = |
| new OfflineAudioContext(1, renderDuration * sampleRate, sampleRate); |
| const src = new ConstantSourceNode(context); |
| src.connect(context.destination); |
| |
| src.offset.setValueAtTime(0.5, 0); |
| src.offset.setValueCurveAtTime([-1, 1], 0.75 * renderDuration, 0.1); |
| // Now cancel the effect of the setTarget. |
| src.offset.cancelAndHoldAtTime(0.5 * renderDuration); |
| |
| src.start(); |
| context.startRendering() |
| .then(buffer => { |
| let actual = buffer.getChannelData(0); |
| // Because the setTarget was cancelled, the output should be a |
| // constant. |
| should( |
| actual, 'After cancelling future setValueCurve event, output') |
| .beConstantValueOf(0.5); |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define('cancel setValueCurve now', (task, should) => { |
| const context = |
| new OfflineAudioContext(1, renderDuration * sampleRate, sampleRate); |
| const src = new ConstantSourceNode(context); |
| src.connect(context.destination); |
| |
| src.offset.setValueAtTime(0.5, 0); |
| src.offset.setValueCurveAtTime([-1, 1], 0.5 * renderDuration, 0.1); |
| // Now cancel the effect of the setTarget. |
| src.offset.cancelAndHoldAtTime(0.5 * renderDuration); |
| |
| src.start(); |
| context.startRendering() |
| .then(buffer => { |
| let actual = buffer.getChannelData(0); |
| // Because the setTarget was cancelled, the output should be a |
| // constant. |
| should( |
| actual, |
| 'After cancelling current setValueCurve event starting now, output') |
| .beConstantValueOf(0.5); |
| }) |
| .then(task.done.bind(task)); |
| }); |
| |
| audit.define( |
| { |
| label: 'linear, cancel, linear, cancel, linear', |
| description: 'Schedules 3 linear ramps, cancelling 2 of them, ' |
| + 'so that we end up with 2 cancel events next to each other' |
| }, |
| (task, should) => { |
| cancelTest2( |
| should, |
| linearRampTest('1st linearRamp'), |
| {valueThreshold: 0, curveThreshold: 0}, |
| (g, cancelTime, expectedConstant, cancelTime2) => { |
| // Ramp from first cancel time to the end will be cancelled at |
| // second cancel time. |
| const v1 = expectedConstant; |
| const t1 = cancelTime; |
| const v2 = 2; |
| const t2 = renderDuration; |
| g[0].gain.linearRampToValueAtTime(v2, t2); |
| g[2].gain.setValueAtTime(v1, t1); |
| g[2].gain.linearRampToValueAtTime(v2, t2); |
| |
| const expectedConstant2 = |
| audioParamLinearRamp(cancelTime2, v1, t1, v2, t2); |
| |
| return { |
| constantEndTime: cancelTime, |
| message: `2nd linearRamp(${v2}, ${t2})`, |
| expectedConstant2 |
| }; |
| }, |
| (g, cancelTime2, expectedConstant2) => { |
| // Ramp from second cancel time to the end. |
| const v3 = 0; |
| const t3 = renderDuration; |
| g[0].gain.linearRampToValueAtTime(v3, t3); |
| g[3].gain.setValueAtTime(expectedConstant2, cancelTime2); |
| g[3].gain.linearRampToValueAtTime(v3, t3); |
| return { |
| constantEndTime2: cancelTime2, |
| message2: `3rd linearRamp(${v3}, ${t3})`, |
| }; |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| |
| // Common function for doing a linearRamp test. This just does a linear |
| // ramp from 0 to v0 at from time 0 to t0. Then another linear ramp is |
| // scheduled from v0 to 0 from time t0 to t1. This is the ramp that is to |
| // be cancelled. |
| function linearRampTest(message) { |
| return function(g, v0, t0, cancelTime) { |
| g[0].gain.setValueAtTime(0, 0); |
| g[1].gain.setValueAtTime(0, 0); |
| g[0].gain.linearRampToValueAtTime(v0, t0); |
| g[1].gain.linearRampToValueAtTime(v0, t0); |
| |
| let v1 = 0; |
| let t1 = renderDuration; |
| g[0].gain.linearRampToValueAtTime(v1, t1); |
| g[1].gain.linearRampToValueAtTime(v1, t1); |
| |
| expectedConstant = |
| Math.fround(v0 + (v1 - v0) * (cancelTime - t0) / (t1 - t0)); |
| |
| return { |
| expectedConstant: expectedConstant, |
| autoMessage: |
| message + ': linearRampToValue(' + v1 + ', ' + t1 + ')', |
| summary: message, |
| }; |
| } |
| } |
| |
| // Run the cancellation test. A set of automations is created and |
| // canceled. |
| // |
| // |testerFunction| is a function that generates the automation to be |
| // tested. It is given an array of 3 gain nodes, the value and time of an |
| // initial linear ramp, and the time where the cancellation should occur. |
| // The function must do the automations for the first two gain nodes. It |
| // must return a dictionary with |expectedConstant| being the value at the |
| // cancellation time, |autoMessage| for message to describe the test, and |
| // |summary| for general summary message to be printed at the end of the |
| // test. |
| // |
| // |thresholdOptions| is a property bag that specifies the error threshold |
| // to use. |thresholdOptions.valueThreshold| is the error threshold for |
| // comparing the actual constant output after cancelling to the expected |
| // value. |thresholdOptions.curveThreshold| is the error threshold for |
| // comparing the actual and expected automation curves before the |
| // cancelation point. |
| // |
| // For cancellation tests, |postCancelTest| is a function that schedules |
| // some automation after the cancellation. It takes 3 arguments: an array |
| // of the gain nodes, the cancellation time, and the expected value at the |
| // cancellation time. This function must return a dictionary consisting |
| // of |constantEndtime| indicating when the held constant from |
| // cancellation stops being constant, |message| giving a summary of what |
| // automation is being used, and |errorThreshold| that is the error |
| // threshold between the expected curve and the actual curve. |
| // |
| function cancelTest( |
| should, testerFunction, thresholdOptions, postCancelTest) { |
| // Create a context with three channels. Channel 0 is the test channel |
| // containing the actual output that includes the cancellation of |
| // events. Channel 1 is the expected data upto the cancellation so we |
| // can verify the cancellation produced the correct result. Channel 2 |
| // is for verifying events inserted after the cancellation so we can |
| // verify that automations are correctly generated after the |
| // cancellation point. |
| let context = |
| new OfflineAudioContext(3, renderDuration * sampleRate, sampleRate); |
| |
| // Test source is a constant signal |
| let src = context.createBufferSource(); |
| src.buffer = createConstantBuffer(context, 1, 1); |
| src.loop = true; |
| |
| // We'll do the automation tests with three gain nodes. One (g0) will |
| // have cancelAndHoldAtTime and the other (g1) will not. g1 is |
| // used as the expected result for that automation up to the |
| // cancellation point. They should be the same. The third node (g2) is |
| // used for testing automations inserted after the cancellation point, |
| // if any. g2 is the expected result from the cancellation point to the |
| // end of the test. |
| |
| let g0 = context.createGain(); |
| let g1 = context.createGain(); |
| let g2 = context.createGain(); |
| let v0 = 1; |
| let t0 = 0.01; |
| |
| let cancelTime = renderDuration / 2; |
| |
| // Test automation here. The tester function is responsible for setting |
| // up the gain nodes with the desired automation for testing. |
| autoResult = testerFunction([g0, g1, g2], v0, t0, cancelTime); |
| let expectedConstant = autoResult.expectedConstant; |
| let autoMessage = autoResult.autoMessage; |
| let summaryMessage = autoResult.summary; |
| |
| // Cancel scheduled events somewhere in the middle of the test |
| // automation. |
| g0.gain.cancelAndHoldAtTime(cancelTime); |
| |
| let constantEndTime; |
| if (postCancelTest) { |
| postResult = |
| postCancelTest([g0, g1, g2], cancelTime, expectedConstant); |
| constantEndTime = postResult.constantEndTime; |
| } |
| |
| // Connect everything together (with a merger to make a two-channel |
| // result). Channel 0 is the test (with cancelAndHoldAtTime) and |
| // channel 1 is the reference (without cancelAndHoldAtTime). |
| // Channel 1 is used to verify that everything up to the cancellation |
| // has the correct values. |
| src.connect(g0); |
| src.connect(g1); |
| src.connect(g2); |
| let merger = context.createChannelMerger(3); |
| g0.connect(merger, 0, 0); |
| g1.connect(merger, 0, 1); |
| g2.connect(merger, 0, 2); |
| merger.connect(context.destination); |
| |
| // Go! |
| src.start(); |
| |
| return context.startRendering().then(function(buffer) { |
| let actual = buffer.getChannelData(0); |
| let expected = buffer.getChannelData(1); |
| |
| // The actual output should be a constant from the cancel time to the |
| // end. We use the last value of the actual output as the constant, |
| // but we also want to compare that with what we thought it should |
| // really be. |
| |
| let cancelFrame = Math.ceil(cancelTime * sampleRate); |
| |
| // Verify that the curves up to the cancel time are "identical". The |
| // should be but round-off may make them differ slightly due to the |
| // way cancelling is done. |
| let endFrame = Math.floor(cancelTime * sampleRate); |
| should( |
| actual.slice(0, endFrame), |
| autoMessage + ' up to time ' + cancelTime) |
| .beCloseToArray( |
| expected.slice(0, endFrame), |
| {absoluteThreshold: thresholdOptions.curveThreshold}); |
| |
| // Verify the output after the cancellation is a constant. |
| let actualTail; |
| let constantEndFrame; |
| |
| if (postCancelTest) { |
| constantEndFrame = Math.ceil(constantEndTime * sampleRate); |
| actualTail = actual.slice(cancelFrame, constantEndFrame); |
| } else { |
| actualTail = actual.slice(cancelFrame); |
| } |
| |
| let actualConstant = actual[cancelFrame]; |
| |
| should( |
| actualTail, |
| 'Cancelling ' + autoMessage + ' at time ' + cancelTime) |
| .beConstantValueOf(actualConstant); |
| |
| // Verify that the constant is the value we expect. |
| should( |
| actualConstant, |
| 'Expected value for cancelling ' + autoMessage + ' at time ' + |
| cancelTime) |
| .beCloseTo( |
| expectedConstant, |
| {threshold: thresholdOptions.valueThreshold}); |
| |
| // Verify the curve after the constantEndTime matches our |
| // expectations. |
| if (postCancelTest) { |
| let c2 = buffer.getChannelData(2); |
| should(actual.slice(constantEndFrame), postResult.message) |
| .beCloseToArray( |
| c2.slice(constantEndFrame), |
| {absoluteThreshold: postResult.errorThreshold || 0}); |
| } |
| }); |
| } |
| |
| // Similar to cancelTest, but does 2 cancels. |
| function cancelTest2( |
| should, testerFunction, thresholdOptions, |
| postCancelTest, postCancelTest2) { |
| // Channel 0: Actual output that includes the cancellation of events. |
| // Channel 1: Expected data up to the first cancellation. |
| // Channel 2: Expected data from 1st cancellation to 2nd cancellation. |
| // Channel 3: Expected data from 2nd cancellation to the end. |
| const context = |
| new OfflineAudioContext(4, renderDuration * sampleRate, sampleRate); |
| |
| const src = context.createConstantSource(); |
| |
| // g0: Actual gain which will have cancelAndHoldAtTime called on it |
| // twice. |
| // g1: Expected gain from start to the 1st cancel. |
| // g2: Expected gain from 1st cancel to the 2nd cancel. |
| // g3: Expected gain from the 2nd cancel to the end. |
| const g0 = context.createGain(); |
| const g1 = context.createGain(); |
| const g2 = context.createGain(); |
| const g3 = context.createGain(); |
| const v0 = 1; |
| const t0 = 0.01; |
| |
| const cancelTime1 = renderDuration * 0.5; |
| const cancelTime2 = renderDuration * 0.75; |
| |
| // Run testerFunction to generate the 1st ramp. |
| const { |
| expectedConstant, autoMessage, summaryMessage} = |
| testerFunction([g0, g1, g2], v0, t0, cancelTime1); |
| |
| // 1st cancel, cancelling the 1st ramp. |
| g0.gain.cancelAndHoldAtTime(cancelTime1); |
| |
| // Run postCancelTest to generate the 2nd ramp. |
| const { |
| constantEndTime, message, errorThreshold = 0, expectedConstant2} = |
| postCancelTest( |
| [g0, g1, g2], cancelTime1, expectedConstant, cancelTime2); |
| |
| // 2nd cancel, cancelling the 2nd ramp. |
| g0.gain.cancelAndHoldAtTime(cancelTime2); |
| |
| // Run postCancelTest2 to generate the 3rd ramp. |
| const {constantEndTime2, message2} = |
| postCancelTest2([g0, g1, g2, g3], cancelTime2, expectedConstant2); |
| |
| // Connect everything together |
| src.connect(g0); |
| src.connect(g1); |
| src.connect(g2); |
| src.connect(g3); |
| const merger = context.createChannelMerger(4); |
| g0.connect(merger, 0, 0); |
| g1.connect(merger, 0, 1); |
| g2.connect(merger, 0, 2); |
| g3.connect(merger, 0, 3); |
| merger.connect(context.destination); |
| |
| // Go! |
| src.start(); |
| |
| return context.startRendering().then(function (buffer) { |
| const actual = buffer.getChannelData(0); |
| const expected1 = buffer.getChannelData(1); |
| const expected2 = buffer.getChannelData(2); |
| const expected3 = buffer.getChannelData(3); |
| |
| const cancelFrame1 = Math.ceil(cancelTime1 * sampleRate); |
| const cancelFrame2 = Math.ceil(cancelTime2 * sampleRate); |
| |
| const constantEndFrame1 = Math.ceil(constantEndTime * sampleRate); |
| const constantEndFrame2 = Math.ceil(constantEndTime2 * sampleRate); |
| |
| const actualTail1 = actual.slice(cancelFrame1, constantEndFrame1); |
| const actualTail2 = actual.slice(cancelFrame2, constantEndFrame2); |
| |
| const actualConstant1 = actual[cancelFrame1]; |
| const actualConstant2 = actual[cancelFrame2]; |
| |
| // Verify first section curve |
| should( |
| actual.slice(0, cancelFrame1), |
| autoMessage + ' up to time ' + cancelTime1) |
| .beCloseToArray( |
| expected1.slice(0, cancelFrame1), |
| {absoluteThreshold: thresholdOptions.curveThreshold}); |
| |
| // Verify that a value was held after 1st cancel |
| should( |
| actualTail1, |
| 'Cancelling ' + autoMessage + ' at time ' + cancelTime1) |
| .beConstantValueOf(actualConstant1); |
| |
| // Verify that held value after 1st cancel was correct |
| should( |
| actualConstant1, |
| 'Expected value for cancelling ' + autoMessage + ' at time ' + |
| cancelTime1) |
| .beCloseTo( |
| expectedConstant, |
| {threshold: thresholdOptions.valueThreshold}); |
| |
| // Verify middle section curve |
| should(actual.slice(constantEndFrame1, cancelFrame2), message) |
| .beCloseToArray( |
| expected2.slice(constantEndFrame1, cancelFrame2), |
| {absoluteThreshold: errorThreshold}); |
| |
| // Verify that a value was held after 2nd cancel |
| should( |
| actualTail2, |
| 'Cancelling ' + message + ' at time ' + cancelTime2) |
| .beConstantValueOf(actualConstant2); |
| |
| // Verify that held value after 2nd cancel was correct |
| should( |
| actualConstant2, |
| 'Expected value for cancelling ' + message + ' at time ' + |
| cancelTime2) |
| .beCloseTo( |
| expectedConstant2, |
| {threshold: thresholdOptions.valueThreshold}); |
| |
| // Verify end section curve |
| should(actual.slice(constantEndFrame2), message2) |
| .beCloseToArray( |
| expected3.slice(constantEndFrame2), |
| {absoluteThreshold: errorThreshold || 0}); |
| }); |
| } |
| </script> |
| </body> |
| </html> |
