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mediasource.ts
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mediasource.ts
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/**
* Xpra Typescript Client
* @link https://github.com/andersevenrud/xpra-html5-client
* @author Anders Evenrud <andersevenrud@gmail.com>
* @license Mozilla Public License Version 2.0
*
* ---
*
* Based on original Xpra source
* @copyright Copyright (C) 2016-2022 Antoine Martin <antoine@devloop.org.uk>
* @license Licensed under MPL 2.0, see: http://www.mozilla.org/MPL/2.0/
* @link https://github.com/Xpra-org/xpra-html5
*/
import { getBrowser, getBrowserPlatform } from '../../utils/platform'
import { XpraAudioAdapter } from './adapter'
import { XpraInvalidAudioCodecError, XpraAudioError } from '../../errors'
import { XpraAudioCodecMap } from '../../types'
import {
XPRA_AUDIO_CODEC_STRING,
XPRA_AUDIO_CODEC_DESCRIPTION,
} from '../../constants/xpra'
/**
* MediaSource Audio Adapter
*/
export class XpraMediaSourceAdapter extends XpraAudioAdapter {
private mediaSource: MediaSource | null = null
private mediaSourceReady = false
private mediaSourceBuffer: SourceBuffer | null = null
async setup() {
const mediaSource = new MediaSource()
const attach = () =>
new Promise<SourceBuffer>((resolve, reject) => {
mediaSource.addEventListener('sourceopen', () => {
console.debug('XpraAudio -> MediaSource', 'Source opened')
if (this.mediaSourceReady) {
reject(new XpraAudioError('MediaSource already open'))
} else {
const codec = (XPRA_AUDIO_CODEC_STRING as Record<string, string>)[
this.audioCodec
]
if (codec) {
try {
const asb = mediaSource.addSourceBuffer(codec)
asb.mode = 'sequence'
asb.addEventListener('error', (e) => {
console.error('XpraAudio -> MediaSource -> SourceBuffer', e)
})
resolve(asb)
} catch (e) {
reject(e)
}
} else {
reject(
new XpraInvalidAudioCodecError(
`Media codec '${this.audioCodec}' unsupported`
)
)
}
}
})
})
this.mediaSource = mediaSource
this.audio.src = window.URL.createObjectURL(this.mediaSource)
this.mediaSourceBuffer = await attach()
this.mediaSourceReady = true
}
async start() {
try {
await this.audio.play()
} catch (e) {
console.error('XpraAudio#start', 'audio start error', e)
}
}
stop() {
super.stop()
if (this.mediaSource) {
try {
if (this.mediaSourceBuffer) {
this.mediaSource.removeSourceBuffer(this.mediaSourceBuffer)
}
if (this.mediaSource.readyState === 'open') {
this.mediaSource.endOfStream()
}
} catch (e) {
console.error('XpraMediaSourceAdapter', e)
}
}
this.mediaSource = null
this.mediaSourceBuffer = null
this.mediaSourceReady = false
}
protected pushBuffer(buffer: Uint8Array) {
if (this.mediaSourceBuffer) {
this.mediaSourceBuffer.appendBuffer(buffer)
}
}
protected isReady() {
return !!this.mediaSourceBuffer && !this.mediaSourceBuffer.updating
}
static getBlacklistedCodecs(ignoreBlacklist: boolean) {
const browser = getBrowser()
const platform = getBrowserPlatform()
const isFirefox = browser.name === 'Firefox'
const isSafari = browser.name === 'Safari'
const isChrome = browser.name === 'Chrome'
const isMac = platform.type === 'darwin'
const blacklist: string[] = []
if (!ignoreBlacklist) {
if (isFirefox || isSafari) {
blacklist.push('opus+mka', 'vorbis+mka')
if (isSafari) {
//this crashes Safari!
blacklist.push('wav')
}
} else if (isChrome) {
blacklist.push('aac+mpeg4')
if (isMac) {
blacklist.push('opus+mka')
}
}
}
return blacklist
}
static getCodecs(ignoreBlacklist = false): XpraAudioCodecMap {
if (self.MediaSource) {
const blacklist = this.getBlacklistedCodecs(ignoreBlacklist)
const found = Object.entries(XPRA_AUDIO_CODEC_STRING)
.filter(([, v]) => MediaSource.isTypeSupported(v))
.filter(([k]) => !blacklist.includes(k))
return Object.fromEntries(found)
}
return {}
}
static getSupportedCodecs(ignoreBlacklist = false) {
const entries = Object.keys(
XpraMediaSourceAdapter.getCodecs(ignoreBlacklist)
).map((k) => [`mediasource:${k}`, XPRA_AUDIO_CODEC_DESCRIPTION[k]])
return Object.fromEntries(entries)
}
}