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1 | // Thanks: https://github.com/feross/render-media | |
2 | // TODO: use render-media once https://github.com/feross/render-media/issues/32 is fixed | |
3 | ||
4 | const MediaElementWrapper = require('mediasource') | |
5 | import { extname } from 'path' | |
6 | const videostream = require('videostream') | |
7 | ||
8 | const VIDEOSTREAM_EXTS = [ | |
9 | '.m4a', | |
10 | '.m4v', | |
11 | '.mp4' | |
12 | ] | |
13 | ||
14 | type RenderMediaOptions = { | |
15 | controls: boolean | |
16 | autoplay: boolean | |
17 | } | |
18 | ||
19 | function renderVideo ( | |
20 | file: any, | |
21 | elem: HTMLVideoElement, | |
22 | opts: RenderMediaOptions, | |
23 | callback: (err: Error, renderer: any) => void | |
24 | ) { | |
25 | validateFile(file) | |
26 | ||
27 | return renderMedia(file, elem, opts, callback) | |
28 | } | |
29 | ||
30 | function renderMedia (file: any, elem: HTMLVideoElement, opts: RenderMediaOptions, callback: (err: Error, renderer?: any) => void) { | |
31 | const extension = extname(file.name).toLowerCase() | |
32 | let preparedElem: any | |
33 | let currentTime = 0 | |
34 | let renderer: any | |
35 | ||
36 | try { | |
37 | if (VIDEOSTREAM_EXTS.indexOf(extension) >= 0) { | |
38 | renderer = useVideostream() | |
39 | } else { | |
40 | renderer = useMediaSource() | |
41 | } | |
42 | } catch (err) { | |
43 | return callback(err) | |
44 | } | |
45 | ||
46 | function useVideostream () { | |
47 | prepareElem() | |
48 | preparedElem.addEventListener('error', function onError (err: Error) { | |
49 | preparedElem.removeEventListener('error', onError) | |
50 | ||
51 | return callback(err) | |
52 | }) | |
53 | preparedElem.addEventListener('loadstart', onLoadStart) | |
54 | return videostream(file, preparedElem) | |
55 | } | |
56 | ||
57 | function useMediaSource (useVP9 = false) { | |
58 | const codecs = getCodec(file.name, useVP9) | |
59 | ||
60 | prepareElem() | |
61 | preparedElem.addEventListener('error', function onError (err: Error) { | |
62 | preparedElem.removeEventListener('error', onError) | |
63 | ||
64 | // Try with vp9 before returning an error | |
65 | if (codecs.indexOf('vp8') !== -1) return fallbackToMediaSource(true) | |
66 | ||
67 | return callback(err) | |
68 | }) | |
69 | preparedElem.addEventListener('loadstart', onLoadStart) | |
70 | ||
71 | const wrapper = new MediaElementWrapper(preparedElem) | |
72 | const writable = wrapper.createWriteStream(codecs) | |
73 | file.createReadStream().pipe(writable) | |
74 | ||
75 | if (currentTime) preparedElem.currentTime = currentTime | |
76 | ||
77 | return wrapper | |
78 | } | |
79 | ||
80 | function fallbackToMediaSource (useVP9 = false) { | |
81 | if (useVP9 === true) console.log('Falling back to media source with VP9 enabled.') | |
82 | else console.log('Falling back to media source..') | |
83 | ||
84 | useMediaSource(useVP9) | |
85 | } | |
86 | ||
87 | function prepareElem () { | |
88 | if (preparedElem === undefined) { | |
89 | preparedElem = elem | |
90 | ||
91 | preparedElem.addEventListener('progress', function () { | |
92 | currentTime = elem.currentTime | |
93 | }) | |
94 | } | |
95 | } | |
96 | ||
97 | function onLoadStart () { | |
98 | preparedElem.removeEventListener('loadstart', onLoadStart) | |
99 | if (opts.autoplay) preparedElem.play() | |
100 | ||
101 | callback(null, renderer) | |
102 | } | |
103 | } | |
104 | ||
105 | function validateFile (file: any) { | |
106 | if (file == null) { | |
107 | throw new Error('file cannot be null or undefined') | |
108 | } | |
109 | if (typeof file.name !== 'string') { | |
110 | throw new Error('missing or invalid file.name property') | |
111 | } | |
112 | if (typeof file.createReadStream !== 'function') { | |
113 | throw new Error('missing or invalid file.createReadStream property') | |
114 | } | |
115 | } | |
116 | ||
117 | function getCodec (name: string, useVP9 = false) { | |
118 | const ext = extname(name).toLowerCase() | |
119 | if (ext === '.mp4') { | |
120 | return 'video/mp4; codecs="avc1.640029, mp4a.40.5"' | |
121 | } | |
122 | ||
123 | if (ext === '.webm') { | |
124 | if (useVP9 === true) return 'video/webm; codecs="vp9, opus"' | |
125 | ||
126 | return 'video/webm; codecs="vp8, vorbis"' | |
127 | } | |
128 | ||
129 | return undefined | |
130 | } | |
131 | ||
132 | export { | |
133 | renderVideo | |
134 | } |