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audio-busses.ts
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audio-busses.ts
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// Imports
import _ from 'lodash'
import xpath from 'xpath'
// Types
import { AudioBus, MasterAudioBus } from '../types/audio-bus'
/**
* Helper function: Map single audio bus info from XML
* @param audioBusNode
* @returns
*/
function mapSingleAudioBus(audioBusNode: Element): AudioBus | MasterAudioBus {
// Map all base attributes of input
const name: string = audioBusNode.nodeName
// Guard bus name - must be master or busA-busH
if (name !== 'master' && !name.startsWith('bus')) {
throw new Error(`Unknown name of audio bus.. ${name}`)
}
const abbr = name === 'master' ? 'M' : name.replace('bus', '')
// Extract attributes
const volumeAttr = audioBusNode.attributes.getNamedItem('volume')
const mutedAttr = audioBusNode.attributes.getNamedItem('muted')
const meterF1attr = audioBusNode.attributes.getNamedItem('meterF1')
const meterF2attr = audioBusNode.attributes.getNamedItem('meterF2')
// Optional attributes
const customName = audioBusNode.attributes.getNamedItem('name')
// Guard missing attributes
if (!volumeAttr || !mutedAttr || !meterF1attr || !meterF2attr) {
throw new Error(`Audio bus ${abbr} did not contain necessary attributes`)
}
// Parse audio bus info into class object
const bus = {
name,
abbr,
muted: String(mutedAttr.value) === 'True',
volume: Number(volumeAttr.value),
audioMeter: {
left: Number(meterF1attr.value),
right: Number(meterF2attr.value),
}
} as AudioBus
// Parse custom audio bus name
if (customName && customName.value && customName.value.length > 0) {
bus.customName = customName.value
}
// For master bus only - Append headphones volume
if (name === 'master') {
const headphonesVolumeAttr = audioBusNode.attributes.getNamedItem('headphonesVolume')
if (headphonesVolumeAttr) {
return {
...bus,
headphonesVolume: Number(headphonesVolumeAttr.value)
} as MasterAudioBus
}
}
return bus
}
/**
* Audio busses class
*/
export default class AudioBusses {
/**
* Extract info for all audio channels (master + busses) from XML document
*
* @param xmlDocument
*/
static all(xmlDocument: Document): { [key: string]: AudioBus } {
const audioBussesXml: Element[] = xpath.select('//vmix/audio/*', xmlDocument) as Element[]
// console.log(audioBussesXml)
const audioBusses = audioBussesXml.map(mapSingleAudioBus)
// console.log(audioBusses)
return _.keyBy(
audioBusses,
(bus: AudioBus) => bus.name
)
}
/**
* Extract all audio-busses from XML document (excluding master)
*
* @param xmlDocument
*/
static busses(xmlDocument: Document): { [key: string]: AudioBus } {
const audioBussesXml: Element[] = xpath.select(
`//vmix/audio/*[starts-with(local-name(),'bus')]`,
xmlDocument
) as Element[]
// console.log(audioBussesXml)
const audioBusses = audioBussesXml.map(mapSingleAudioBus)
// console.log(audioBusses)
return _.keyBy(
audioBusses,
(bus: AudioBus) => bus.name
) as { [key: string]: AudioBus }
}
/**
* Extract master audio bus info from XML document
* @param xmlDocument
*/
static master(xmlDocument: Document): MasterAudioBus {
const masterAudioXMLelement: Element = xpath.select('//vmix/audio/master', xmlDocument, true) as Element
return mapSingleAudioBus(masterAudioXMLelement)! as MasterAudioBus
}
}