-
-
Notifications
You must be signed in to change notification settings - Fork 31
Expand file tree
/
Copy pathavif.js
More file actions
134 lines (125 loc) · 4.07 KB
/
Copy pathavif.js
File metadata and controls
134 lines (125 loc) · 4.07 KB
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
// Decode AVIF data using native browser's AV1 decoder.
const isEdge = navigator.userAgent.indexOf("Edge") >= 0;
function decodeMov(arr) {
const blob = new Blob([arr], {type: "video/mp4"});
const blobURL = URL.createObjectURL(blob);
return new Promise((resolve, reject) => {
const vid = document.createElement("video");
vid.addEventListener(isEdge ? "ended" : "loadeddata", () => {
if ((vid.mozDecodedFrames == null ||
vid.mozDecodedFrames > 0)
&&
(vid.webkitDecodedFrameCount == null ||
vid.webkitDecodedFrameCount > 0)) {
resolve(vid);
} else {
reject(new Error("partial AV1 frame"));
}
});
vid.addEventListener("error", () => {
reject(new Error("cannot decode AV1 frame"));
});
vid.muted = true;
vid.src = blobURL;
vid.play();
}).then(vid => {
const c = document.createElement("canvas");
const ctx = c.getContext("2d");
c.width = vid.videoWidth;
c.height = vid.videoHeight;
ctx.drawImage(vid, 0, 0, c.width, c.height);
const imgData = ctx.getImageData(0, 0, c.width, c.height);
return {
width: c.width,
height: c.height,
data: imgData.data.buffer,
}
}).then(res => {
URL.revokeObjectURL(blobURL);
return res;
}, err => {
URL.revokeObjectURL(blobURL);
throw err;
});
}
// Respond to job requests from worker.
function handleMessage(e) {
const msg = e.data;
if (msg && msg.type === "avif-mov") {
decodeMov(msg.data).then(decoded => {
navigator.serviceWorker.controller.postMessage({
id: msg.id,
type: "avif-rgba",
...decoded
}, [decoded.data]);
}, err => {
navigator.serviceWorker.controller.postMessage({
id: msg.id,
type: "avif-error",
data: err.message,
});
});
}
}
function hasAv1Support() {
const vid = document.createElement("video");
return vid.canPlayType('video/mp4; codecs="av01.0.05M.08"') === "probably";
}
function getServiceWorkerOpts({forcePolyfill, wasmURL}) {
const usePolyfill = forcePolyfill || !hasAv1Support();
return {usePolyfill, wasmURL};
}
// See https://redfin.engineering/how-to-fix-the-refresh-button-when-using-service-workers-a8e27af6df68
// for the Service Worker update best practices.
export function register(regPromise, opts) {
if (!("serviceWorker" in navigator)) {
return Promise.reject(new Error("Service Worker API is not supported"));
}
if (typeof opts === "function") {
opts = {confirmUpdate: opts};
}
opts = Object.assign({
confirmUpdate: () => true,
onUpdate: () => window.location.reload(),
wasmURL: "/staic/js/dav1d.wasm",
forcePolyfill: false,
}, opts);
if (typeof regPromise === "string") {
const regOpts = opts.scope ? {scope: opts.scope} : undefined;
regPromise = navigator.serviceWorker.register(regPromise, regOpts);
}
return regPromise.then(reg => {
let refreshing = false;
function refresh() {
if (refreshing) return;
refreshing = true;
opts.onUpdate(reg);
}
function promptUserToRefresh() {
Promise.resolve(opts.confirmUpdate(reg)).then(shouldUpdate => {
if (shouldUpdate) {
if (navigator.serviceWorker.controller) {
reg.waiting.postMessage({type: "avif-update"});
} else {
refresh();
}
}
});
}
function awaitStateChange() {
const waitFor = navigator.serviceWorker.controller ? "installed" : "activated";
reg.installing.addEventListener("statechange", function() {
if (this.state === waitFor) promptUserToRefresh();
});
}
navigator.serviceWorker.addEventListener("controllerchange", refresh);
navigator.serviceWorker.addEventListener("message", handleMessage);
if (navigator.serviceWorker.controller) {
const swOpts = getServiceWorkerOpts(opts);
navigator.serviceWorker.controller.postMessage({type: "avif-ready", data: swOpts});
}
if (reg.waiting) return promptUserToRefresh();
reg.addEventListener("updatefound", awaitStateChange);
});
}
export default {register};