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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.resume().'); | |
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); | |
Raymond Toy
2015/10/21 18:22:45
Since you loop, why not just create a buffer of le
hongchan
2015/10/22 18:23:48
Done.
| |
26 var constantSource = context.createBufferSource(); | |
27 constantSource.buffer = constantBuffer; | |
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 if (context.currentTime === suspendTime1) | |
38 testPassed('Context is suspended at ' + suspendTime1 * sampleRate + ' frame as expected.'); | |
39 | |
40 constantSource.connect(context.destination); | |
41 constantSource.start(); | |
42 testPassed('A constant buffer is connected to destination and started at ' + | |
43 suspendTime1 * sampleRate + ' frame.'); | |
44 | |
45 context.resume(); | |
46 }); | |
47 | |
48 // Suspend at 2 seconds and disconnect the node. The audio output should | |
49 // be 0.0 from |suspendTime2| to the end. | |
50 var suspendTime2 = 2; | |
51 context.suspend(suspendTime2).then(function () { | |
52 if (context.currentTime === suspendTime2) | |
53 testPassed('Context is suspended at ' + suspendTime2 * sampleRate + ' frame as expected.'); | |
54 | |
55 constantSource.disconnect(); | |
56 testPassed('A constant buffer is disconnected at ' + suspendTime2 * samp leRate + ' frame.'); | |
57 | |
58 context.resume(); | |
59 }); | |
60 | |
61 context.startRendering().then(function (buffer) { | |
62 verifyResult(buffer); | |
63 finishJSTest(); | |
64 }); | |
65 | |
66 function verifyResult(buffer) { | |
67 var data = buffer.getChannelData(0); | |
68 | |
69 var suspendIndex1 = suspendTime1 * sampleRate; | |
70 var suspendIndex2 = suspendTime2 * sampleRate; | |
71 var endIndex = renderDuration * sampleRate; | |
72 | |
73 // Split the rendered buffer into 3 segments: | |
74 // [0, suspendIndex1), [suspendIndex1, suspendIndex2), [suspendIndex2, | |
75 // endIndex). | |
76 var subarray0 = data.subarray(0, suspendIndex1); | |
Raymond Toy
2015/10/21 18:22:45
slice or subarray? Which is better?
hongchan
2015/10/22 18:23:48
Array.slice() creates a new array. Array.subarray(
| |
77 var subarray1 = data.subarray(suspendIndex1, suspendIndex2); | |
78 var subarray2 = data.subarray(suspendIndex2, endIndex); | |
79 | |
80 // Each segment should contain a constant value of 0, 1 and 0 | |
81 // respectively. | |
82 Should('Buffer frame [0, ' + suspendIndex1 + ')', subarray0).beConstant ValueOf(0); | |
83 Should('Buffer frame [' + suspendIndex1 + ', ' + suspendIndex2 + ')', su barray1) | |
84 .beConstantValueOf(1); | |
85 Should('Buffer frame [' + suspendIndex2 + ', ' + endIndex + ')', subarra y2) | |
86 .beConstantValueOf(0); | |
87 } | |
88 | |
89 successfullyParsed = true; | |
90 </script> | |
91 | |
92 </body> | |
93 </html> | |
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