Kyoo/src/videoSupport/playbackMethodDetector.ts

import { detect } from "detect-browser";
import { Track, WatchItem } from "../models/watch-item";

export enum method
{
	direct = "Direct Play",
	transmux = "Transmux",
	transcode = "Transcode"
};

export class SupportList
{
	container: boolean;
	videoCodec: boolean;
	audioCodec: boolean;
}

export function getPlaybackMethod(player: HTMLVideoElement, item: WatchItem): method
{
	let supportList: SupportList = getWhatIsSupported(player, item);

	if (supportList.container)
	{
		if (supportList.videoCodec && supportList.audioCodec)
			return method.direct;
		return method.transcode;
	}

	if (supportList.videoCodec && supportList.audioCodec)
		return method.transmux;
	return method.transcode;
}

export function getWhatIsSupported(player: HTMLVideoElement, item: WatchItem): SupportList
{
	let supportList: SupportList = new SupportList();
	let browser = detect();

	if (!browser)
	{
		supportList.container = false;
		supportList.videoCodec = false;
		supportList.audioCodec = false;
	}
	else
	{
		supportList.container = containerIsSupported(player, item.container, browser.name) && item.audios.length <= 1;
		supportList.videoCodec = videoCodecIsSupported(player, item.video.codec, browser.name);
		supportList.audioCodec = audioCodecIsSupported(player, item.audios.map((value: Track) => value.codec), browser.name);
	}
	return (supportList);
}

function containerIsSupported(player: HTMLVideoElement, container: string, browser: string): boolean
{
	let supported: boolean = false;

	switch (container)
	{
		case "asf":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge";
			//videoAudioCodecs = [];
			break;
		case "avi":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge";
			break;
		case "mpg":
		case "mpeg":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge";
			break;
		case "flv":
			supported = browser == "tizen" || browser == "orsay";
			break;
		case "3gp":
		case "mts":
		case "trp":
		case "vob":
		case "vro":
			supported = browser == "tizen" || browser == "orsay";
			break;
		case "mov":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge" || browser == "chrome";
			break;
		case "m2ts":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge";
			break;
		case "wmv":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge";
			//videoAudioCodecs = [];
			break;
		case "ts":
			supported = browser == "tizen" || browser == "orsay" || browser == "edge";
			break;
		case "mp4":
		case "m4v":
			supported = true;
			break;
		case "mkv":
			supported = browser == "tizen" || browser == "orsay" || browser == "chrome" || browser == "edge";

			if (supported)
				break;

			if (player.canPlayType("video/x-matroska") || player.canPlayType("video/mkv"))
				supported = true;
			break;
		default:
			break;
	}
	return supported;
}

//SHOULD CHECK FOR DEPTH (8bits ok but 10bits unsuported for almost every browsers)
function videoCodecIsSupported(player: HTMLVideoElement, codec: string, browser: string): boolean
{
	switch (codec)
	{
		case "h264":
			return !!player.canPlayType('video/mp4; codecs="avc1.42E01E, mp4a.40.2"'); //The !! is used to parse the string as a bool
		case "h265":
		case "hevc":
			if (browser == "tizen" || browser == "orsay" || browser == "xboxOne" || browser == "ios")
				return true;
			//SHOULD SUPPORT CHROMECAST ULTRA
			//	if (browser.chromecast)
			//	{

			//		var isChromecastUltra = userAgent.indexOf('aarch64') !== -1;
			//		if (isChromecastUltra)
			//		{
			//			return true;
			//		}
			//	}
			return !!player.canPlayType('video/hevc; codecs="hevc, aac"');
		case "mpeg2video":
			return browser == "orsay" || browser == "tizen" || browser == "edge";
		case "vc1":
			return browser == "orsay" || browser == "tizen" || browser == "edge";
		case "msmpeg4v2":
			return browser == "orsay" || browser == "tizen";
		case "vp8":
			return !!player.canPlayType('video/webm; codecs="vp8');
		case "vp9":
			return !!player.canPlayType('video/webm; codecs="vp9"');
		case "vorbis":
			return browser == "orsay" || browser == "tizen" || !!player.canPlayType('video/webm; codecs="vp8');
		default:
			return false;
	}
}

//SHOULD CHECK FOR NUMBER OF AUDIO CHANNEL (2 ok but 5 not in some browsers)
function audioCodecIsSupported(player: HTMLVideoElement, codecs: string[], browser: string): boolean
{
	for (let codec of codecs)
	{
		switch (codec)
		{
			case "mp3":
				return !!player.canPlayType('video/mp4; codecs="avc1.640029, mp4a.69"') ||
					!!player.canPlayType('video/mp4; codecs="avc1.640029, mp4a.6B"');
			case "aac":
				return !!player.canPlayType('video/mp4; codecs="avc1.640029, mp4a.40.2"');
			case "mp2":
				return browser == "orsay" || browser == "tizen" || browser == "edge";
			case "pcm_s16le":
			case "pcm_s24le":
				return browser == "orsay" || browser == "tizen" || browser == "edge";
			case "aac_latm":
				return browser == "orsay" || browser == "tizen";
			case "opus":
				return !!player.canPlayType('audio/ogg; codecs="opus"');
			case "flac":
				return browser == "orsay" || browser == "tizen" || browser == "edge";
			default:
				return false;
		}
	}
}