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
content / test / data / gpu / vc / videos_mxn.html [blame]
<!--
Copyright 2021 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
<head>
<title>MxN Video playbacks</title>
<script>
const _defaultRows = 7;
const _defaultColumns = 7;
const _totalVideoWidth = 1600;
const _totalVideoHeight = 900;
let codec = 'vp9';
const parsedString = (function (names) {
const pairs = {};
for (let i = 0; i < names.length; ++i) {
const keyValue = names[i].split('=', 2);
if (keyValue.length === 1) {
pairs[keyValue[0]] = '';
} else {
pairs[keyValue[0]] = decodeURIComponent(keyValue[1].replace(/\+/g, ' '));
}
}
return pairs;
})(window.location.search.substr(1).split('&'));
function GetVideoSource(videoCount, index, codec) {
switch (codec) {
case 'vp8':
if (videoCount <= 4) {
return './teddy1_vp8_640x360_30fps.webm';
} else {
if (index < 4) {
return './teddy3_vp8_320x180_30fps.webm';
} else if (index < 16) {
return './teddy2_vp8_320x180_15fps.webm';
} else {
return './teddy1_vp8_320x180_7fps.webm';
}
}
break;
case 'vp9':
default:
if (videoCount <= 4) {
return './teddy1_vp9_640x360_30fps.webm';
} else {
if (index < 4) {
return './teddy3_vp9_320x180_30fps.webm';
} else if (index < 16) {
return './teddy2_vp9_320x180_15fps.webm';
} else {
return './teddy1_vp9_320x180_7fps.webm';
}
}
break;
}
}
function startMxNVideos() {
const container = document.getElementById('container');
// Get the video row count and the column count from the string.
// Example: videos_mxn.html?rows=9&columns=9
let videoRows = parsedString['rows'];
let videoColumns = parsedString['columns'];
if (videoRows === undefined) {
videoRows = _defaultRows;
}
if (videoColumns === undefined) {
videoColumns = _defaultColumns;
}
// Get the video source option from the string.
codecString = parsedString['codec'];
if (codecString === 'vp8') {
codec = 'vp8';
} else if (codecString !== 'vp9' && codecString !== undefined) {
console.warn('Unsupported video codec format! Switch to default VP9.');
}
// Limite the number of videos to 20x20.
// These videos will not load when the number is too big.
const maxColRow = Math.max(videoRows, videoColumns);
if (maxColRow > 20) {
const p = container.appendChild(document.createElement('p'));
p.style.position = "absolute";
p.style.top = 0;
p.style.left = 0;
p.style.width = _totalVideoWidth;
p.style.height = _totalVideoHeight;
p.innerHTML = "Cannot support videos more than 20 x 20!" + "<br />" +
"Please change the number of rows/columns.";
return;
}
// Calculate the video onscreen size
const videoWidth = _totalVideoWidth / maxColRow;
const videoHeight = _totalVideoHeight / maxColRow;
const iconHeight = videoHeight / 8;
// Create MxN videos.
let animatedBar;
let iconBottom;
const videoCount = videoRows * videoColumns;
for (let row = 0; row < videoRows; row++) {
for (let column = 0; column < videoColumns; column++) {
// Onscreen position.
const videoTop = row * videoHeight;
const videoLeft = column * videoWidth;
// Video source.
const i = row * videoColumns + column;
const videoSrc = GetVideoSource(videoCount, i, codec);
createOneVideo(videoTop, videoLeft, videoWidth, videoHeight,
videoSrc, /*hasBorder=*/ i === 0);
// Create an icon on top of each video.
createOneIcon(videoTop, videoLeft, videoWidth, videoHeight, iconHeight);
// For the voice animation on the last video.
if (i === 0) {
animatedBar = document.createElement('icon');
iconBottom = videoTop + iconHeight * 2;
createVoiceAnimationBar(animatedBar, videoTop, videoLeft,
videoWidth, videoHeight, iconHeight);
}
}
}
// Create one small video at the upper right corner to similate the one
// from the local camera (640x360).
createLocalVideoAndIcon(videoWidth, videoHeight, codec);
// Start the voice icon animation.
const frameTime30Fps = 32; // ms
let lastTimestamp = performance.now();
let barHeight = 0;
// Voice bar animation at 30 FPS
function voiceBarAnimation(timestamp) {
const elapsed = timestamp - lastTimestamp;
if (elapsed < frameTime30Fps) {
window.requestAnimationFrame(voiceBarAnimation);
return;
}
lastTimestamp = timestamp;
const maxBarHeight = iconHeight - 4;
barHeight = barHeight + (maxBarHeight / 10);
if (barHeight > maxBarHeight)
barHeight = maxBarHeight / 10;
animatedBar.style.top = iconBottom - barHeight;
animatedBar.style.height = barHeight;
window.requestAnimationFrame(voiceBarAnimation);
}
window.requestAnimationFrame(voiceBarAnimation);
}
function createOneVideo(top, left, width, height, videoSrc, hasBorder) {
const video = document.createElement('video');
video.loop = true;
video.autoplay = true;
video.muted = true;
video.src = videoSrc;
video.width = width;
video.height = height;
video.style.position = "absolute";
video.style.top = top;
video.style.left = left;
if (hasBorder) {
const borderWidth = 3;
video.style.borderWidth = borderWidth;
video.width = width - borderWidth * 2;
video.height = height - borderWidth * 2;
video.style.borderStyle = "solid";
video.style.borderColor = "rgba(90, 129, 193, 255)";
}
video.play();
container.appendChild(video);
}
function createOneIcon(videoTop, videoLeft, videoWidth, videoHeight, iconHeight) {
const icon = document.createElement('icon');
icon.style.backgroundColor = "rgba(29, 110, 216, 255)";
icon.style.position = "absolute";
icon.style.width = iconHeight;
icon.style.height = iconHeight;
icon.style.top = videoTop + iconHeight;
icon.style.left = videoLeft + videoWidth - iconHeight * 2;
container.appendChild(icon);
}
function createLocalVideoAndIcon(videoWidth, videoHeight, codec) {
const smallVideoWidth = videoWidth / 3;
const smallVideoHeight = videoHeight / 3;
const iconHeight = smallVideoHeight / 8;
const videoSrc = GetVideoSource(1, 1, codec);
createOneVideo(videoHeight - smallVideoHeight,
_totalVideoWidth - smallVideoWidth, smallVideoWidth,
smallVideoHeight, videoSrc, false);
createOneIcon(videoHeight - smallVideoHeight, _totalVideoWidth -
smallVideoWidth, smallVideoWidth, smallVideoHeight, iconHeight);
}
function createVoiceAnimationBar(bar, videoTop, videoLeft, videoWidth,
videoHeight, iconHeight) {
bar.style.backgroundColor = "white";
bar.style.position = "absolute";
bar.style.width = 5;
bar.style.height = iconHeight - 4;
bar.style.top = videoTop + iconHeight + 4;
bar.style.left = videoLeft + videoWidth - iconHeight * 1.5 - 2;
container.appendChild(bar);
}
</script>
</head>
<body>
<div id="container" style="position:absolute; top:0px; left:0px">
</div>
<script>startMxNVideos();</script>
</body>
</html>