| 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..adbce484b19572a951ba8740aa757f04757379f0
|
| --- /dev/null
|
| +++ b/third_party/WebKit/LayoutTests/webaudio/audioparam-setTargetAtTime-sampling.html
|
| @@ -0,0 +1,102 @@
|
| +<!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>
|
| + <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>
|
|
|
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