1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
|
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type="module">
"use strict";
function tryToCreateNodeOnClosedContext(ctx) {
assert_equals(ctx.state, "closed", "The context is in closed state");
[
{ name: "createBufferSource" },
{
name: "createMediaStreamDestination",
onOfflineAudioContext: false,
},
{ name: "createScriptProcessor" },
{ name: "createStereoPanner" },
{ name: "createAnalyser" },
{ name: "createGain" },
{ name: "createDelay" },
{ name: "createBiquadFilter" },
{ name: "createWaveShaper" },
{ name: "createPanner" },
{ name: "createConvolver" },
{ name: "createChannelSplitter" },
{ name: "createChannelMerger" },
{ name: "createDynamicsCompressor" },
{ name: "createOscillator" },
{
name: "createMediaElementSource",
args: [new Audio()],
onOfflineAudioContext: false,
},
{
name: "createMediaStreamSource",
args: [new AudioContext().createMediaStreamDestination().stream],
onOfflineAudioContext: false,
},
].forEach(function (e) {
if (
e.onOfflineAudioContext == false &&
ctx instanceof OfflineAudioContext
) {
return;
}
try {
ctx[e.name].apply(ctx, e.args);
} catch (err) {
assert_true(false, "unexpected exception thrown for " + e.name);
}
});
}
function loadFile(url, callback) {
return new Promise((resolve) => {
var xhr = new XMLHttpRequest();
xhr.open("GET", url, true);
xhr.responseType = "arraybuffer";
xhr.onload = function () {
resolve(xhr.response);
};
xhr.send();
});
}
// createBuffer, createPeriodicWave and decodeAudioData should work on a context
// that has `state` == "closed"
async function tryLegalOpeerationsOnClosedContext(ctx) {
assert_equals(ctx.state, "closed", "The context is in closed state");
[
{ name: "createBuffer", args: [1, 44100, 44100] },
{
name: "createPeriodicWave",
args: [new Float32Array(10), new Float32Array(10)],
},
].forEach(function (e) {
try {
ctx[e.name].apply(ctx, e.args);
} catch (err) {
assert_true(false, "unexpected exception thrown");
}
});
var buf = await loadFile("/webaudio/resources/sin_440Hz_-6dBFS_1s.wav");
return ctx
.decodeAudioData(buf)
.then(function (decodedBuf) {
assert_true(
true,
"decodeAudioData on a closed context should work, it did."
);
})
.catch(function (e) {
assert_true(
false,
"decodeAudioData on a closed context should work, it did not"
);
});
}
// Test that MediaStreams that are the output of a suspended AudioContext are
// producing silence
// ac1 produce a sine fed to a MediaStreamAudioDestinationNode
// ac2 is connected to ac1 with a MediaStreamAudioSourceNode, and check that
// there is silence when ac1 is suspended
async function testMultiContextOutput() {
var ac1 = new AudioContext(),
ac2 = new AudioContext();
await new Promise((resolve) => (ac1.onstatechange = resolve));
ac1.onstatechange = null;
await ac1.suspend();
assert_equals(ac1.state, "suspended", "ac1 is suspended");
var osc1 = ac1.createOscillator(),
mediaStreamDestination1 = ac1.createMediaStreamDestination();
var mediaStreamAudioSourceNode2 = ac2.createMediaStreamSource(
mediaStreamDestination1.stream
),
sp2 = ac2.createScriptProcessor(),
silentBuffersInARow = 0;
osc1.connect(mediaStreamDestination1);
mediaStreamAudioSourceNode2.connect(sp2);
osc1.start();
let e = await new Promise((resolve) => (sp2.onaudioprocess = resolve));
while (true) {
let e = await new Promise(
(resolve) => (sp2.onaudioprocess = resolve)
);
var input = e.inputBuffer.getChannelData(0);
var silent = true;
for (var i = 0; i < input.length; i++) {
if (input[i] != 0.0) {
silent = false;
}
}
if (silent) {
silentBuffersInARow++;
if (silentBuffersInARow == 10) {
assert_true(
true,
"MediaStreams produce silence when their input is blocked."
);
break;
}
} else {
assert_equals(
silentBuffersInARow,
0,
"No non silent buffer inbetween silent buffers."
);
}
}
sp2.onaudioprocess = null;
ac1.close();
ac2.close();
}
// Test that there is no buffering between contexts when connecting a running
// AudioContext to a suspended AudioContext. Gecko's ScriptProcessorNode does some
// buffering internally, so we ensure this by using a very very low frequency
// on a sine, and oberve that the phase has changed by a big enough margin.
async function testMultiContextInput() {
var ac1 = new AudioContext(),
ac2 = new AudioContext();
await new Promise((resolve) => (ac1.onstatechange = resolve));
ac1.onstatechange = null;
var osc1 = ac1.createOscillator(),
mediaStreamDestination1 = ac1.createMediaStreamDestination(),
sp1 = ac1.createScriptProcessor();
var mediaStreamAudioSourceNode2 = ac2.createMediaStreamSource(
mediaStreamDestination1.stream
),
sp2 = ac2.createScriptProcessor(),
eventReceived = 0;
osc1.frequency.value = 0.0001;
osc1.connect(mediaStreamDestination1);
osc1.connect(sp1);
mediaStreamAudioSourceNode2.connect(sp2);
osc1.start();
var e = await new Promise((resolve) => (sp2.onaudioprocess = resolve));
var inputBuffer1 = e.inputBuffer.getChannelData(0);
sp2.value = inputBuffer1[inputBuffer1.length - 1];
await ac2.suspend();
await ac2.resume();
while (true) {
var e = await new Promise(
(resolve) => (sp2.onaudioprocess = resolve)
);
var inputBuffer = e.inputBuffer.getChannelData(0);
if (eventReceived++ == 3) {
var delta = Math.abs(inputBuffer[1] - sp2.value),
theoreticalIncrement =
(2048 * 3 * Math.PI * 2 * osc1.frequency.value) /
ac1.sampleRate;
assert_true(
delta >= theoreticalIncrement,
"Buffering did not occur when the context was suspended (delta:" +
delta +
" increment: " +
theoreticalIncrement +
")"
);
break;
}
}
ac1.close();
ac2.close();
sp1.onaudioprocess = null;
sp2.onaudioprocess = null;
}
// Take an AudioContext, make sure it switches to running when the audio starts
// flowing, and then, call suspend, resume and close on it, tracking its state.
async function testAudioContext() {
var ac = new AudioContext();
assert_equals(
ac.state,
"suspended",
"AudioContext should start in suspended state."
);
var stateTracker = {
previous: ac.state,
// no promise for the initial suspended -> running
initial: { handler: false },
suspend: { promise: false, handler: false },
resume: { promise: false, handler: false },
close: { promise: false, handler: false },
};
await new Promise((resolve) => (ac.onstatechange = resolve));
assert_true(
stateTracker.previous == "suspended" && ac.state == "running",
'AudioContext should switch to "running" when the audio hardware is' +
" ready."
);
stateTracker.previous = ac.state;
stateTracker.initial.handler = true;
let promise_statechange_suspend = new Promise((resolve) => {
ac.onstatechange = resolve;
}).then(() => {
stateTracker.suspend.handler = true;
});
await ac.suspend();
assert_true(
!stateTracker.suspend.handler,
"Promise should be resolved before the callback."
);
assert_equals(
ac.state,
"suspended",
'AudioContext should switch to "suspended" when the audio stream is ' +
"suspended."
);
await promise_statechange_suspend;
stateTracker.previous = ac.state;
let promise_statechange_resume = new Promise((resolve) => {
ac.onstatechange = resolve;
}).then(() => {
stateTracker.resume.handler = true;
});
await ac.resume();
assert_true(
!stateTracker.resume.handler,
"Promise should be resolved before the callback."
);
assert_equals(
ac.state,
"running",
'AudioContext should switch to "running" when the audio stream is ' +
"resumed."
);
await promise_statechange_resume;
stateTracker.previous = ac.state;
let promise_statechange_close = new Promise((resolve) => {
ac.onstatechange = resolve;
}).then(() => {
stateTracker.close.handler = true;
});
await ac.close();
assert_true(
!stateTracker.close.handler,
"Promise should be resolved before the callback."
);
assert_equals(
ac.state,
"closed",
'AudioContext should switch to "closed" when the audio stream is ' +
"closed."
);
await promise_statechange_close;
stateTracker.previous = ac.state;
tryToCreateNodeOnClosedContext(ac);
await tryLegalOpeerationsOnClosedContext(ac);
}
async function testOfflineAudioContext() {
var o = new OfflineAudioContext(1, 44100, 44100);
assert_equals(
o.state,
"suspended",
"OfflineAudioContext should start in suspended state."
);
var previousState = o.state,
finishedRendering = false;
o.startRendering().then(function (buffer) {
finishedRendering = true;
});
await new Promise((resolve) => (o.onstatechange = resolve));
assert_true(
previousState == "suspended" && o.state == "running",
"onstatechanged" +
"handler is called on state changed, and the new state is running"
);
previousState = o.state;
await new Promise((resolve) => (o.onstatechange = resolve));
assert_true(
previousState == "running" && o.state == "closed",
"onstatechanged handler is called when rendering finishes, " +
"and the new state is closed"
);
assert_true(
finishedRendering,
"The Promise that is resolved when the rendering is " +
"done should be resolved earlier than the state change."
);
previousState = o.state;
function afterRenderingFinished() {
assert_true(
false,
"There should be no transition out of the closed state."
);
}
o.onstatechange = afterRenderingFinished;
tryToCreateNodeOnClosedContext(o);
await tryLegalOpeerationsOnClosedContext(o);
}
async function testSuspendResumeEventLoop() {
var ac = new AudioContext();
var source = ac.createBufferSource();
source.buffer = ac.createBuffer(1, 44100, 44100);
await new Promise((resolve) => (ac.onstatechange = resolve));
ac.onstatechange = null;
assert_true(ac.state == "running", "initial state is running");
await ac.suspend();
source.start();
ac.resume();
await new Promise((resolve) => (source.onended = resolve));
assert_true(true, "The AudioContext did resume");
}
function testResumeInStateChangeForResumeCallback() {
return new Promise((resolve) => {
var ac = new AudioContext();
ac.onstatechange = function () {
ac.resume().then(() => {
assert_true(true, "resume promise resolved as expected.");
resolve();
});
};
});
}
var tests = [
testOfflineAudioContext,
testMultiContextOutput,
testMultiContextInput,
testSuspendResumeEventLoop,
testResumeInStateChangeForResumeCallback,
testAudioContext,
];
tests.forEach(function (f) {
promise_test(f, f.name);
});
</script>
</head>
</html>
|
