play-dl-test/play-dl/YouTube/stream.ts

import { video_info } from "."
import { FormatInterface, LiveEnded, LiveStreaming, Stream } from "./classes/LiveStream"

export enum StreamType{
    Arbitrary = 'arbitrary',
	Raw = 'raw',
	OggOpus = 'ogg/opus',
	WebmOpus = 'webm/opus',
	Opus = 'opus',
}

interface StreamOptions {
    low_latency : boolean;
    preferred_quality : "144p" | "240p" | "360p" | "480p" | "720p" | "1080p" 
}

interface InfoData{
    LiveStreamData : {
        isLive : boolean
        dashManifestUrl : string
        hlsManifestUrl : string
    }
    html5player : string
    format : any[]
    video_details : any
}

function parseAudioFormats(formats : any[]){
    let result: any[] = []
    formats.forEach((format) => {
        let type = format.mimeType as string
        if(type.startsWith('audio')){
            format.codec = type.split('codecs="')[1].split('"')[0]
            format.container = type.split('audio/')[1].split(';')[0]
            result.push(format)
        }
    })
    return result
}

export async function stream(url : string, options : StreamOptions = { low_latency : false, preferred_quality : "144p" }): Promise<Stream | LiveStreaming | LiveEnded>{
    let info = await video_info(url)
    let final: any[] = [];
    let type : StreamType;
    if(!options.low_latency) options.low_latency = false
    if(!options.preferred_quality) options.preferred_quality = "144p"
    if(info.LiveStreamData.isLive === true && info.LiveStreamData.hlsManifestUrl !== null) {
        return await live_stream(info as InfoData, options)
    }

    let audioFormat = parseAudioFormats(info.format)
    let opusFormats = filterFormat(audioFormat, "opus")

    if(opusFormats.length === 0){
        type = StreamType.Arbitrary
        final.push(audioFormat[audioFormat.length - 1])
    }
    else{
        type = StreamType.WebmOpus
        final.push(opusFormats[opusFormats.length - 1])
    }

    if(final.length === 0) {
        type = StreamType.Arbitrary
        final.push(info.format[info.format.length - 1])
    }
    
    return new Stream(final[0].url, type, info.video_details.durationInSec) 
}

export async function stream_from_info(info : InfoData, options : StreamOptions = { low_latency : false, preferred_quality : "144p" }): Promise<Stream | LiveStreaming | LiveEnded>{
    let final: any[] = [];
    let type : StreamType;
    if(!options.low_latency) options.low_latency = false
    if(!options.preferred_quality) options.preferred_quality = "144p"
    if(info.LiveStreamData.isLive === true && info.LiveStreamData.hlsManifestUrl !== null) {
        return await live_stream(info as InfoData, options)
    }

    let audioFormat = parseAudioFormats(info.format)
    let opusFormats = filterFormat(audioFormat, "opus")

    if(opusFormats.length === 0){
        type = StreamType.Arbitrary
        final.push(audioFormat[audioFormat.length - 1])
    }
    else{
        type = StreamType.WebmOpus
        final.push(opusFormats[opusFormats.length - 1])
    }

    if(final.length === 0) {
        type = StreamType.Arbitrary
        final.push(info.format[info.format.length - 1])
    }
    
    return new Stream(final[0].url, type, info.video_details.durationInSec) 
}

function filterFormat(formats : any[], codec : string){
    let result: any[] = []
    formats.forEach((format) => {
        if(format.codec === codec) result.push(format)
    })
    return result
}

async function live_stream(info : InfoData, options : StreamOptions): Promise<LiveStreaming | LiveEnded>{
    let res_144 : FormatInterface = {
        url : '',
        targetDurationSec : 0,
        maxDvrDurationSec : 0
    }
    info.format.forEach((format) => {
        if(format.qualityLabel === options.preferred_quality) res_144 = format
        else return
    })
    let stream : LiveStreaming | LiveEnded
    if(info.video_details.duration === '0') {
        stream = new LiveStreaming((res_144.url.length !== 0) ? res_144 : info.format[info.format.length - 2], options.low_latency)
    }
    else {
        stream = new LiveEnded((res_144.url.length !== 0) ? res_144 : info.format[info.format.length - 2])
    }
    return stream
}