Chapter support

[DesweR]

Implementation of chapter support (also duration and thumbnail)

string ClipsBodyRequest(string clipId) {

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	s += '    durationSeconds';

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	s += '    medium: thumbnailURL(width: 480, height: 272)';

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}


string ChapterSelectButtonVideoBodyRequest(string vodId) {
	string hash = "8d2793384aac3773beab5e59bd5d6f585aedb923d292800119e03d40cd0f9b41";
	string s = "";
	s += '{';
	s += '    "operationName":"VideoPlayer_ChapterSelectButtonVideo",';
	s += '    "variables": {';
	s += '        "includePrivate":false,';
	s += '        "videoID": "' + vodId + '"';
	s += '    },';
	s += '    "extensions": {';
	s += '        "persistedQuery": {';
	s += '            "version": 1,';
	s += '            "sha256Hash": "' + hash + '"';
	s += '        }';
	s += '    }';
	s += '}';

	return s;
}


array<dictionary> GetChaptersFromVodId(string vodId) {
	array<dictionary> chapters;

	string body = ChapterSelectButtonVideoBodyRequest(vodId);
	JsonValue momentArray = SendGraphQLRequest(body)["video"]["moments"]["edges"];

	int startPrev = -1;

	if (momentArray.isArray()) {
		for (int k = 0; k < momentArray.size(); k++) {
			JsonValue moment = momentArray[k]["node"];
			if (!moment.isObject()) continue;

			string title = moment["description"].asString();
			if (title.isEmpty()) continue;

			int start = moment["positionMilliseconds"].asInt();
			int len = moment["durationMilliseconds"].asInt();

			if (chapters.empty()) {
				if (start < 120000) start = 0;
			}

			if (len < 120000) { // ignore chapters less than two minutes, most likely they were added by mistake
				if (startPrev == -1) startPrev = start;
				continue;
			}

			if (startPrev != -1) {
				start = startPrev;
				startPrev = -1;
			}

			dictionary item;
			item["title"] = title;
			item["time"] = formatInt(start);
			chapters.insertLast(item);
		}
	}

	return chapters;
}


string ClipsParse(const string &in path, dictionary &MetaData, array<dictionary> &QualityList, const string &in headerClientId) {

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	int duration = clipRoot["durationSeconds"].asInt() * 1000;
	string thumbnail = clipRoot["medium"].asString();

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	MetaData["duration"] = duration;
	MetaData["thumbnail"] = thumbnail;

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}


int parseDuration(const string &in str) { // 48h60m60s
	if (!str.isEmpty()) return 0;

	int duration = 0;
	string hours;
	string mins;
	string secs;
	uint p = 0;

	for (uint k = 0; k < str.length(); k++) {
		uint8 char = str[k];

		if ((char < "0"[0]) || (char > "9"[0])) {
			if (char == "h"[0]) {
				duration += parseInt(str.substr(p, k - p)) * 60 * 60;
			} else if (char == "m"[0]) {
				duration += parseInt(str.substr(p, k - p)) * 60;
			} else if (char == "s"[0]) {
				duration += parseInt(str.substr(p, k - p));
			}
			p = k + 1;
		}
	}

	return duration;
}


string PlayitemParse(const string &in path, dictionary &MetaData, array<dictionary> &QualityList) {

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	int duration;
	string thumbnail;

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	if (stream.isArray()) {

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		duration = parseDuration(item["duration"].asString()) * 1000;
		thumbnail = item["thumbnail_url"].asString();
		thumbnail.replace("%{width}x%{height}", "480x272");
		thumbnail.replace("{width}x{height}", "480x272");

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	} else if (stream.isObject()) {

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	MetaData["duration"] = duration;
	MetaData["thumbnail"] = thumbnail;
	MetaData["chapter"] = GetChaptersFromVodId(vodId);

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}