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
|
<!DOCTYPE html>
<html>
<head>
<title>MediaStream Insertable Streams - VideoTrackGenerator</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../webrtc/RTCPeerConnection-helper.js"></script>
</head>
<body>
<p class="instructions">If prompted, use the accept button to give permission to use your audio and video devices.</p>
<h1 class="instructions">Description</h1>
<p class="instructions">This test checks that generating video MediaStreamTracks from VideoTrackGenerator works as expected.</p>
<script>
const pixelColour = [50, 100, 150, 255];
const height = 240;
const width = 320;
function makeVideoFrame(timestamp) {
const canvas = new OffscreenCanvas(width, height);
const ctx = canvas.getContext('2d', {alpha: false});
ctx.fillStyle = `rgba(${pixelColour.join()})`;
ctx.fillRect(0, 0, width, height);
return new VideoFrame(canvas, {timestamp, alpha: 'discard'});
}
async function getVideoFrame() {
const stream = await getNoiseStream({video: true});
const input_track = stream.getTracks()[0];
const processor = new MediaStreamTrackProcessor(input_track);
const reader = processor.readable.getReader();
const result = await reader.read();
input_track.stop();
return result.value;
}
function assertPixel(t, bytes, expected, epsilon = 5) {
for (let i = 0; i < bytes.length; i++) {
t.step(() => {
assert_less_than(Math.abs(bytes[i] - expected[i]), epsilon, "Mismatched pixel");
});
}
}
async function initiateSingleTrackCall(t, track, output) {
const caller = new RTCPeerConnection();
t.add_cleanup(() => caller.close());
const callee = new RTCPeerConnection();
t.add_cleanup(() => callee.close());
caller.addTrack(track);
t.add_cleanup(() => track.stop());
exchangeIceCandidates(caller, callee);
// Wait for the first track.
const e = await exchangeOfferAndListenToOntrack(t, caller, callee);
output.srcObject = new MediaStream([e.track]);
// Exchange answer.
await exchangeAnswer(caller, callee);
await waitForConnectionStateChange(callee, ['connected']);
}
promise_test(async t => {
const videoFrame = await getVideoFrame();
const originalWidth = videoFrame.displayWidth;
const originalHeight = videoFrame.displayHeight;
const originalTimestamp = videoFrame.timestamp;
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
// Use a MediaStreamTrackProcessor as a sink for |generator| to verify
// that |processor| actually forwards the frames written to its writable
// field.
const processor = new MediaStreamTrackProcessor(generator);
const reader = processor.readable.getReader();
const readerPromise = new Promise(async resolve => {
const result = await reader.read();
assert_equals(result.value.displayWidth, originalWidth);
assert_equals(result.value.displayHeight, originalHeight);
assert_equals(result.value.timestamp, originalTimestamp);
resolve();
});
generator.writable.getWriter().write(videoFrame);
return readerPromise;
}, 'Tests that VideoTrackGenerator forwards frames to sink');
promise_test(async t => {
const videoFrame = makeVideoFrame(1);
const originalWidth = videoFrame.displayWidth;
const originalHeight = videoFrame.displayHeight;
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
const video = document.createElement("video");
video.autoplay = true;
video.width = 320;
video.height = 240;
video.srcObject = new MediaStream([generator.track]);
video.play();
// Wait for the video element to be connected to the generator and
// generate the frame.
video.onloadstart = () => generator.writable.getWriter().write(videoFrame);
return new Promise((resolve)=> {
video.ontimeupdate = t.step_func(() => {
const canvas = document.createElement("canvas");
canvas.width = originalWidth;
canvas.height = originalHeight;
const context = canvas.getContext('2d');
context.drawImage(video, 0, 0);
// Pick a pixel in the centre of the video and check that it has the colour of the frame provided.
const pixel = context.getImageData(videoFrame.displayWidth/2, videoFrame.displayHeight/2, 1, 1);
assertPixel(t, pixel.data, pixelColour);
resolve();
});
});
}, 'Tests that frames are actually rendered correctly in a stream used for a video element.');
promise_test(async t => {
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
// Write frames for the duration of the test.
const writer = generator.writable.getWriter();
let timestamp = 0;
const intervalId = setInterval(
t.step_func(async () => {
if (generator.track.readyState === 'live') {
timestamp++;
await writer.write(makeVideoFrame(timestamp));
}
}),
40);
t.add_cleanup(() => clearInterval(intervalId));
const video = document.createElement('video');
video.autoplay = true;
video.width = width;
video.height = height;
video.muted = true;
await initiateSingleTrackCall(t, generator.track, video);
return new Promise(resolve => {
video.ontimeupdate = t.step_func(() => {
const canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
const context = canvas.getContext('2d');
context.drawImage(video, 0, 0);
// Pick a pixel in the centre of the video and check that it has the
// colour of the frame provided.
const pixel = context.getImageData(width / 2, height / 2, 1, 1);
// Encoding/decoding can add noise, so increase the threshhold to 8.
assertPixel(t, pixel.data, pixelColour, 8);
resolve();
});
});
}, 'Tests that frames are actually rendered correctly in a stream sent over a peer connection.');
promise_test(async t => {
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
const inputCanvas = new OffscreenCanvas(width, height);
const inputContext = inputCanvas.getContext('2d', {alpha: false});
// draw four quadrants
const colorUL = [255, 0, 0, 255];
inputContext.fillStyle = `rgba(${colorUL.join()})`;
inputContext.fillRect(0, 0, width / 2, height / 2);
const colorUR = [255, 255, 0, 255];
inputContext.fillStyle = `rgba(${colorUR.join()})`;
inputContext.fillRect(width / 2, 0, width / 2, height / 2);
const colorLL = [0, 255, 0, 255];
inputContext.fillStyle = `rgba(${colorLL.join()})`;
inputContext.fillRect(0, height / 2, width / 2, height / 2);
const colorLR = [0, 255, 255, 255];
inputContext.fillStyle = `rgba(${colorLR.join()})`;
inputContext.fillRect(width / 2, height / 2, width / 2, height / 2);
// Write frames for the duration of the test.
const writer = generator.writable.getWriter();
let timestamp = 0;
const intervalId = setInterval(
t.step_func(async () => {
if (generator.track.readyState === 'live') {
timestamp++;
await writer.write(new VideoFrame(
inputCanvas, {timestamp: timestamp, alpha: 'discard'}));
}
}),
40);
t.add_cleanup(() => clearInterval(intervalId));
const caller = new RTCPeerConnection();
t.add_cleanup(() => caller.close());
const callee = new RTCPeerConnection();
t.add_cleanup(() => callee.close());
const sender = caller.addTrack(generator.track);
exchangeIceCandidates(caller, callee);
// Wait for the first track.
const e = await exchangeOfferAndListenToOntrack(t, caller, callee);
// Exchange answer.
await exchangeAnswer(caller, callee);
await waitForConnectionStateChange(callee, ['connected']);
const params = sender.getParameters();
params.encodings.forEach(e => e.scaleResolutionDownBy = 2);
sender.setParameters(params);
const processor = new MediaStreamTrackProcessor(e.track);
const reader = processor.readable.getReader();
// The first frame may not have had scaleResolutionDownBy applied
const numTries = 5;
for (let i = 1; i <= numTries; i++) {
const {value: outputFrame} = await reader.read();
if (outputFrame.displayWidth !== width / 2) {
assert_less_than(i, numTries, `First ${numTries} frames were the wrong size.`);
outputFrame.close();
continue;
}
assert_equals(outputFrame.displayWidth, width / 2);
assert_equals(outputFrame.displayHeight, height / 2);
const outputCanvas = new OffscreenCanvas(width / 2, height / 2);
const outputContext = outputCanvas.getContext('2d', {alpha: false});
outputContext.drawImage(outputFrame, 0, 0);
outputFrame.close();
// Check the four quadrants
const pixelUL = outputContext.getImageData(width / 8, height / 8, 1, 1);
assertPixel(t, pixelUL.data, colorUL);
const pixelUR =
outputContext.getImageData(width * 3 / 8, height / 8, 1, 1);
assertPixel(t, pixelUR.data, colorUR);
const pixelLL =
outputContext.getImageData(width / 8, height * 3 / 8, 1, 1);
assertPixel(t, pixelLL.data, colorLL);
const pixelLR =
outputContext.getImageData(width * 3 / 8, height * 3 / 8, 1, 1);
assertPixel(t, pixelLR.data, colorLR);
break;
}
}, 'Tests that frames are sent correctly with RTCRtpEncodingParameters.scaleResolutionDownBy.');
promise_test(async t => {
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
const writer = generator.writable.getWriter();
const frame = makeVideoFrame(1);
await writer.write(frame);
assert_equals(generator.track.kind, "video");
assert_equals(generator.track.readyState, "live");
}, "Tests that creating a VideoTrackGenerator works as expected");
promise_test(async t => {
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
const writer = generator.writable.getWriter();
const frame = makeVideoFrame(1);
await writer.write(frame);
assert_throws_dom("InvalidStateError", () => frame.clone(), "VideoFrame wasn't destroyed on write.");
}, "Tests that VideoFrames are destroyed on write.");
promise_test(async t => {
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
const writer = generator.writable.getWriter();
const frame = makeVideoFrame(1);
assert_throws_js(TypeError, writer.write(frame));
}, "Mismatched frame and generator kind throws on write.");
promise_test(async t => {
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
// Use a MediaStreamTrackProcessor as a sink for |generator| to verify
// that |processor| actually forwards the frames written to its writable
// field.
const processor = new MediaStreamTrackProcessor(generator.track);
const reader = processor.readable.getReader();
const videoFrame = makeVideoFrame(1);
const writer = generator.writable.getWriter();
const videoFrame1 = makeVideoFrame(1);
writer.write(videoFrame1);
const result1 = await reader.read();
assert_equals(result1.value.timestamp, 1);
generator.muted = true;
// This frame is expected to be discarded.
const videoFrame2 = makeVideoFrame(2);
writer.write(videoFrame2);
generator.muted = false;
const videoFrame3 = makeVideoFrame(3);
writer.write(videoFrame3);
const result3 = await reader.read();
assert_equals(result3.value.timestamp, 3);
// Set up a read ahead of time, then mute, enqueue and unmute.
const promise5 = reader.read();
generator.muted = true;
writer.write(makeVideoFrame(4)); // Expected to be discarded.
generator.muted = false;
writer.write(makeVideoFrame(5));
const result5 = await promise5;
assert_equals(result5.value.timestamp, 5);
}, 'Tests that VideoTrackGenerator forwards frames only when unmuted');
// Note - tests for mute/unmute events will be added once
// https://github.com/w3c/mediacapture-transform/issues/81 is resolved
</script>
</body>
</html>
|
