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
|
var debug = require('debug')('webtorrent:append-to')
var MediaSourceStream = require('mediasource')
var path = require('path')
var videostream = require('videostream')
var VIDEOSTREAM_EXTS = [ '.mp4', '.m4v', '.m4a' ]
var MEDIASOURCE_VIDEO_EXTS = [ '.mp4', '.m4v', '.webm' ]
var MEDIASOURCE_AUDIO_EXTS = [ '.m4a', '.mp3' ]
var MEDIASOURCE_EXTS = MEDIASOURCE_VIDEO_EXTS.concat(MEDIASOURCE_AUDIO_EXTS)
var AUDIO_EXTS = [ '.wav', '.aac', '.ogg', '.oga' ]
var IMAGE_EXTS = [ '.jpg', '.jpeg', '.png', '.gif', '.bmp' ]
var IFRAME_EXTS = [ '.css', '.html', '.js', '.md', '.pdf', '.txt' ]
var MediaSource = typeof window !== 'undefined' && window.MediaSource
module.exports = function appendTo (file, rootElem, cb) {
if (!cb) cb = noop
var elem
var extname = path.extname(file.name).toLowerCase()
var currentTime = 0
if (rootElem && (rootElem.nodeName === 'VIDEO' || rootElem.nodeName === 'AUDIO')) {
throw new Error(
'Invalid video/audio node argument. Argument must be root element that ' +
'video/audio tag will be appended to.'
)
}
if (MEDIASOURCE_EXTS.indexOf(extname) >= 0) appendToMediaSource()
else if (AUDIO_EXTS.indexOf(extname) >= 0) appendToAudio()
else if (IMAGE_EXTS.indexOf(extname) >= 0) appendToImage()
else if (IFRAME_EXTS.indexOf(extname) >= 0) appendToIframe()
else nextTick(cb, new Error('Unsupported file type "' + extname + '": Cannot append to DOM'))
function appendToMediaSource () {
if (!MediaSource) {
return nextTick(cb, new Error(
'Video/audio streaming is not supported in your browser. You can still share ' +
'or download ' + file.name + ' (once it\'s fully downloaded). Use Chrome for ' +
'MediaSource support.'
))
}
var tagName = MEDIASOURCE_VIDEO_EXTS.indexOf(extname) >= 0 ? 'video' : 'audio'
if (VIDEOSTREAM_EXTS.indexOf(extname) >= 0) useVideostream()
else useMediaSource()
function useVideostream () {
debug('Use `videostream` package for ' + file.name)
createElem()
elem.addEventListener('error', fallbackToMediaSource)
elem.addEventListener('playing', onPlaying)
videostream(file, elem)
}
function useMediaSource () {
debug('Use MediaSource API for ' + file.name)
createElem()
elem.addEventListener('error', fallbackToBlobURL)
elem.addEventListener('playing', onPlaying)
file.createReadStream().pipe(new MediaSourceStream(elem, { extname: extname }))
if (currentTime) elem.currentTime = currentTime
}
function useBlobURL () {
debug('Use Blob URL for ' + file.name)
createElem()
elem.addEventListener('error', fatalError)
elem.addEventListener('playing', onPlaying)
file.getBlobURL(function (err, url) {
if (err) return fatalError(err)
elem.src = url
if (currentTime) elem.currentTime = currentTime
})
}
function fallbackToMediaSource (err) {
debug('videostream error: fallback to MediaSource API: %o', err.message || err)
elem.removeEventListener('error', fallbackToMediaSource)
elem.removeEventListener('playing', onPlaying)
useMediaSource()
}
function fallbackToBlobURL (err) {
debug('MediaSource API error: fallback to Blob URL: %o', err.message || err)
elem.removeEventListener('error', fallbackToBlobURL)
elem.removeEventListener('playing', onPlaying)
useBlobURL()
}
function createElem (time) {
if (!elem) {
elem = document.createElement(tagName)
elem.controls = true
elem.autoplay = true // for chrome
elem.play() // for firefox
elem.addEventListener('progress', function () {
currentTime = elem.currentTime
})
rootElem.appendChild(elem)
}
}
}
function onPlaying () {
elem.removeEventListener('playing', onPlaying)
cb(null, elem)
}
function appendToAudio () {
elem = document.createElement('audio')
elem.controls = true
elem.autoplay = true
rootElem.appendChild(elem)
file.getBlobURL(function (err, url) {
if (err) return fatalError(err)
elem.addEventListener('error', fatalError)
elem.addEventListener('playing', onPlaying)
elem.src = url
elem.play()
})
}
function appendToImage () {
file.getBlobURL(function (err, url) {
if (err) return fatalError(err)
elem = document.createElement('img')
elem.src = url
elem.alt = file.name
rootElem.appendChild(elem)
cb(null, elem)
})
}
function appendToIframe () {
file.getBlobURL(function (err, url) {
if (err) return fatalError(err)
elem = document.createElement('iframe')
elem.src = url
if (extname !== '.pdf') elem.sandbox = 'allow-forms allow-scripts'
rootElem.appendChild(elem)
cb(null, elem)
})
}
function fatalError (err) {
if (elem) elem.remove()
err.message = 'Error appending file "' + file.name + '" to DOM: ' + err.message
debug(err.message)
if (cb) cb(err)
}
}
function noop () {}
function nextTick (cb, err, val) {
process.nextTick(function () {
if (cb) cb(err, val)
})
}
|
