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1 <!doctype html> | |
2 <html> | |
3 <head> | |
4 <script src="../resources/js-test.js"></script> | |
5 <script src="resources/compatibility.js"></script> | |
6 <script src="resources/audio-testing.js"></script> | |
7 </head> | |
8 | |
9 <body> | |
10 <script> | |
11 description('Test synchronous graph manipulation with OfflineAudioContext. suspend() and OfflineAudioContext.suspend().'); | |
12 window.jsTestIsAsync = true; | |
13 | |
14 var context; | |
15 var renderQuantum = 128; | |
16 var renderDuration = 3; | |
17 | |
18 // The sample rate is multiple of the rendering quantum, so suspension | |
19 // times fall in to the render quantum boundary. | |
20 var sampleRate = renderQuantum * 100; | |
21 | |
22 context = new OfflineAudioContext(1, sampleRate * renderDuration, sampleRa te); | |
23 | |
24 // Create a constant buffer of 1.0. | |
25 var constantBuffer = createConstantBuffer(context, 128, 1.0); | |
26 var constantSource = context.createBufferSource(); | |
27 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.
| |
28 constantSource.loop = true; | |
29 | |
30 // The audio output from the beginning (0.0 second) to the first suspend | |
31 // time should be 0.0 because there is no connection to the destination. | |
32 | |
33 // Suspend at 1 second and activate the source node. The audio output | |
34 // should be 1.0 from |suspendTime1| to the next suspension. | |
35 var suspendTime1 = 1; | |
36 context.suspend(suspendTime1).then(function () { | |
37 Should('The first suspend time', context.currentTime).beEqualTo(suspendT ime1); | |
38 constantSource.connect(context.destination); | |
39 constantSource.start(); | |
40 context.resume(); | |
41 }); | |
42 | |
43 // Suspend at 2 seconds and disconnect the node. The audio output should | |
44 // be 0.0 from |suspendTime2| to the end. | |
45 var suspendTime2 = 2; | |
46 context.suspend(suspendTime2).then(function () { | |
47 Should('The second suspend time', context.currentTime).beEqualTo(suspend Time2); | |
48 constantSource.disconnect(); | |
49 context.resume(); | |
50 }); | |
51 | |
52 context.startRendering().then(function (buffer) { | |
53 verifyResult(buffer); | |
54 finishJSTest(); | |
55 }); | |
56 | |
57 function verifyResult(buffer) { | |
58 var data = buffer.getChannelData(0); | |
59 | |
60 // 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
| |
61 // [2.0 ~ 3.0]. | |
62 var subarray0 = data.subarray(0, suspendTime1 * sampleRate); | |
63 var subarray1 = data.subarray(suspendTime1 * sampleRate, suspendTime2 * sampleRate); | |
64 var subarray2 = data.subarray(suspendTime2 * sampleRate, renderDuration * sampleRate); | |
65 | |
66 // Each segment should contain a constant value of 0, 1 and 0 | |
67 // respectively. | |
68 Should('Buffer [0~12800]', subarray0).beConstantValueOf(0); | |
69 Should('Buffer [12800~25600]', subarray1).beConstantValueOf(1); | |
70 Should('Buffer [25600~38400]', subarray2).beConstantValueOf(0); | |
71 } | |
72 | |
73 successfullyParsed = true; | |
74 </script> | |
75 | |
76 </body> | |
77 </html> | |
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