Chromium Code Reviews Chromium Code Reviews
Issue 1140723003:
Implement suspend() and resume() for OfflineAudioContext (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master| Index: LayoutTests/webaudio/offlineaudiocontext-suspend-resume-graph-manipulation.html |
| diff --git a/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-graph-manipulation.html b/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-graph-manipulation.html |
| new file mode 100644 |
| index 0000000000000000000000000000000000000000..abf7d78db7265c852ada24279766f3c18b975e68 |
| --- /dev/null |
| +++ b/LayoutTests/webaudio/offlineaudiocontext-suspend-resume-graph-manipulation.html |
| @@ -0,0 +1,77 @@ |
| +<!doctype html> |
| +<html> |
| + <head> |
| + <script src="../resources/js-test.js"></script> |
| + <script src="resources/compatibility.js"></script> |
| + <script src="resources/audio-testing.js"></script> |
| + </head> |
| + |
| + <body> |
| + <script> |
| + description('Test synchronous graph manipulation with OfflineAudioContext.suspend() and OfflineAudioContext.suspend().'); |
| + window.jsTestIsAsync = true; |
| + |
| + var context; |
| + var renderQuantum = 128; |
| + var renderDuration = 3; |
| + |
| + // The sample rate is multiple of the rendering quantum, so suspension |
| + // times fall in to the render quantum boundary. |
| + var sampleRate = renderQuantum * 100; |
| + |
| + context = new OfflineAudioContext(1, sampleRate * renderDuration, sampleRate); |
| + |
| + // Create a constant buffer of 1.0. |
| + var constantBuffer = createConstantBuffer(context, 128, 1.0); |
| + var constantSource = context.createBufferSource(); |
| + constantSource.buffer = dcOffsetBuffer; |
|
Raymond Toy
2015/06/16 17:12:23
dcOffsetBuffer? How did this work?
hongchan
2015/06/16 17:34:36
I missed the variable name change. Fixing it.
|
| + constantSource.loop = true; |
| + |
| + // The audio output from the beginning (0.0 second) to the first suspend |
| + // time should be 0.0 because there is no connection to the destination. |
| + |
| + // Suspend at 1 second and activate the source node. The audio output |
| + // should be 1.0 from |suspendTime1| to the next suspension. |
| + var suspendTime1 = 1; |
| + context.suspend(suspendTime1).then(function () { |
| + Should('The first suspend time', context.currentTime).beEqualTo(suspendTime1); |
| + constantSource.connect(context.destination); |
| + constantSource.start(); |
| + context.resume(); |
| + }); |
| + |
| + // Suspend at 2 seconds and disconnect the node. The audio output should |
| + // be 0.0 from |suspendTime2| to the end. |
| + var suspendTime2 = 2; |
| + context.suspend(suspendTime2).then(function () { |
| + Should('The second suspend time', context.currentTime).beEqualTo(suspendTime2); |
| + constantSource.disconnect(); |
| + context.resume(); |
| + }); |
| + |
| + context.startRendering().then(function (buffer) { |
| + verifyResult(buffer); |
| + finishJSTest(); |
| + }); |
| + |
| + function verifyResult(buffer) { |
| + var data = buffer.getChannelData(0); |
| + |
| + // Split the rendered buffer into 3 segments: [0.0 ~ 1.0], [1.0 ~ 2.0] |
|
Raymond Toy
2015/06/16 17:12:23
What does the ~ mean? Did you mean -?
hongchan
2015/06/16 17:34:36
I replace this with the mathematical expression fo
|
| + // [2.0 ~ 3.0]. |
| + var subarray0 = data.subarray(0, suspendTime1 * sampleRate); |
| + var subarray1 = data.subarray(suspendTime1 * sampleRate, suspendTime2 * sampleRate); |
| + var subarray2 = data.subarray(suspendTime2 * sampleRate, renderDuration * sampleRate); |
| + |
| + // Each segment should contain a constant value of 0, 1 and 0 |
| + // respectively. |
| + Should('Buffer [0~12800]', subarray0).beConstantValueOf(0); |
| + Should('Buffer [12800~25600]', subarray1).beConstantValueOf(1); |
| + Should('Buffer [25600~38400]', subarray2).beConstantValueOf(0); |
| + } |
| + |
| + successfullyParsed = true; |
| + </script> |
| + |
| + </body> |
| +</html> |
