Chromium Code Reviews Chromium Code Reviews
Issue 1377903002:
Use frames instead of time for running AudioParam timelines. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master| Index: third_party/WebKit/LayoutTests/webaudio/audioparam-setTargetAtTime-sampling.html |
| diff --git a/third_party/WebKit/LayoutTests/webaudio/audioparam-setTargetAtTime-sampling.html b/third_party/WebKit/LayoutTests/webaudio/audioparam-setTargetAtTime-sampling.html |
| new file mode 100644 |
| index 0000000000000000000000000000000000000000..fbca12ad4d9c10264f290736171747ba6f159c5c |
| --- /dev/null |
| +++ b/third_party/WebKit/LayoutTests/webaudio/audioparam-setTargetAtTime-sampling.html |
| @@ -0,0 +1,105 @@ |
| +<!doctype html> |
| +<html> |
| + <head> |
| + <script src="resources/compatibility.js"></script> |
| + <script src="resources/audio-testing.js"></script> |
| + <script src="resources/audioparam-testing.js"></script> |
| + <script src="../resources/js-test.js"></script> |
| + <title>Test Sampling for SetTargetAtTime</title> |
| + </head> |
| + |
| + <body> |
| + <div id="description"></div> |
| + <div id="console"></div> |
|
hongchan
2015/10/01 20:20:52
Please remove two lines above. These divs are crea
Raymond Toy
2015/10/01 21:30:50
Done
|
| + |
| + <script> |
| + description("Test Sampling of SetTargetAtTime"); |
| + |
| + window.jsTestIsAsync = true; |
| + // Some slow sample rate, but otherwise arbitrary. |
| + var sampleRate = 12800; |
| + |
| + // Time constant for setTargetValue. Make it short, but is otherwise arbitrary. |
| + var timeConstant = 10 / sampleRate; |
| + |
| + // Defaut initial gain for test. Arbitrary, but we want it large so the changes look large, |
| + // even if the relative change isn't. |
| + var initialGain = 10000; |
| + |
| + var audit = Audit.createTaskRunner(); |
| + |
| + // Test sampling of setTargetAtTime that starts at |startFrame|. A gain node is used for |
| + // testing. |initializeGainFunction| initializes the gain value. |
| + function doTest(message, startFrame, threshold, initializeGainFunction) { |
| + var context = new OfflineAudioContext(1, 256, sampleRate); |
| + var source = context.createBufferSource(); |
| + var b = context.createBuffer(1, 1, sampleRate); |
| + b.getChannelData(0)[0] = 1; |
| + source.buffer = b; |
| + source.loop = true; |
| + |
| + var gain = context.createGain(); |
| + // Initialize the value of the gain node appropriately. |
| + initializeGainFunction(gain); |
| + gain.gain.setTargetAtTime(0, startFrame / sampleRate, timeConstant); |
| + |
| + source.connect(gain); |
| + gain.connect(context.destination); |
| + |
| + source.start(); |
| + |
| + return context.startRendering().then(function (resultBuffer) { |
| + // Verify that the sampling of the setTargetAtTime automation was done correctly. We just |
| + // look at the sample just past the start of the automation. |
| + var resultData = resultBuffer.getChannelData(0); |
| + // Compute the true result at the frame just past startFrame and verify that the actual |
| + // rendered result is within |threshold| of the expected value. |
| + var frame = Math.ceil(startFrame); |
| + var v = 10000 * Math.exp(-(frame / sampleRate - startFrame / sampleRate) / timeConstant); |
| + Should(message + ": Target value at frame " + frame, resultData[frame]).beCloseTo(v, threshold); |
| + }); |
| + } |
| + |
| + function initializeGainBySetter (g) { |
| + g.gain.value = initialGain; |
| + } |
| + |
| + function initializeGainBySetValue (g) { |
| + g.gain.setValueAtTime(initialGain, 0); |
| + } |
| + |
| + audit.defineTask("setValue;128.1", function (done) { |
| + doTest("Initialize by setValueAtTime", 128.1, 3.6029e-8, initializeGainBySetValue).then(done); |
| + }); |
| + |
| + audit.defineTask("setValue;0.1", function (done) { |
| + doTest("Initialize by setValueAtTime", 0.1, 3.6029e-8, initializeGainBySetValue).then(done); |
| + }); |
| + |
| + audit.defineTask("setValue;0.0", function (done) { |
| + doTest("Initialize by setValueAtTime", 0, 3.6029e-8, initializeGainBySetValue).then(done); |
| + }); |
| + |
| + audit.defineTask("setter;128.1", function (done) { |
| + doTest("Initialize by setter", 128.1, 3.6029e-8, initializeGainBySetter).then(done); |
| + }); |
| + |
| + audit.defineTask("setter;0.1", function (done) { |
| + doTest("Initialize by setter", 0.1, 3.6029e-8, initializeGainBySetter).then(done); |
| + }); |
| + |
| + audit.defineTask("setter;0.0", function (done) { |
| + doTest("Initialize by setter", 0, 0, initializeGainBySetter).then(done); |
| + }); |
| + |
| + |
| + audit.defineTask("finish", function (done) { |
| + finishJSTest(); |
| + done(); |
| + }); |
| + |
| + audit.runTasks(); |
| + successfullyParsed = true; |
| + </script> |
| + </body> |
| +</html> |
