v10/dist/dev/media/hls/parse-attributes.js

//#region src/media/hls/parse-attributes.ts
/**
* Parse HLS attribute list from a tag line.
* Handles both quoted and unquoted values.
*/
function parseAttributeList(line) {
	const attributes = /* @__PURE__ */ new Map();
	for (const match of line.matchAll(/([A-Z0-9-]+)=(?:"([^"]*)"|([^,]*))/g)) {
		const key = match[1];
		const value = match[2] ?? match[3] ?? "";
		if (key) attributes.set(key, value);
	}
	return attributes;
}
/**
* Parse RESOLUTION attribute value (WIDTHxHEIGHT).
*/
function parseResolution(value) {
	const match = /^(\d+)x(\d+)$/.exec(value);
	if (!match) return null;
	return {
		width: Number.parseInt(match[1], 10),
		height: Number.parseInt(match[2], 10)
	};
}
/**
* Parse FRAME-RATE attribute to rational frame rate.
*/
function parseFrameRate(value) {
	const fps = Number.parseFloat(value);
	if (Number.isNaN(fps) || fps <= 0) return void 0;
	if (Math.abs(fps - 23.976) < .01) return {
		frameRateNumerator: 24e3,
		frameRateDenominator: 1001
	};
	if (Math.abs(fps - 29.97) < .01) return {
		frameRateNumerator: 3e4,
		frameRateDenominator: 1001
	};
	if (Math.abs(fps - 59.94) < .01) return {
		frameRateNumerator: 6e4,
		frameRateDenominator: 1001
	};
	if (fps % 1 === 0) return { frameRateNumerator: Math.round(fps) };
	return { frameRateNumerator: Math.round(fps) };
}
const AUDIO_CODEC_PREFIXES = [
	"mp4a.",
	"ac-3",
	"ec-3",
	"ac-4",
	"opus",
	"flac",
	"dts",
	"alac",
	"vorbis"
];
/**
* Parse CODECS attribute into separate video and audio codecs.
*/
function parseCodecs(codecs) {
	const parts = codecs.split(",").map((s) => s.trim());
	const result = {};
	for (const codec of parts) {
		const lower = codec.toLowerCase();
		if (codec.startsWith("avc1.") || codec.startsWith("hvc1.") || codec.startsWith("hev1.")) result.video = codec;
		else if (AUDIO_CODEC_PREFIXES.some((prefix) => lower.startsWith(prefix))) result.audio = codec;
	}
	return result;
}
/**
* Parse #EXTINF duration value.
*/
function parseExtInfDuration(value) {
	const durationPart = value.split(",")[0] ?? value;
	const duration = Number.parseFloat(durationPart);
	return Number.isNaN(duration) ? 0 : duration;
}
/**
* Parse BYTERANGE attribute value.
* Format: "length[@offset]"
* If offset is omitted, it continues from the previous byte range end.
*/
function parseByteRange(value, previousEnd) {
	const match = /^(\d+)(?:@(\d+))?$/.exec(value);
	if (!match) return null;
	const length = Number.parseInt(match[1], 10);
	if (Number.isNaN(length)) return null;
	let start;
	if (match[2] !== void 0) {
		start = Number.parseInt(match[2], 10);
		if (Number.isNaN(start)) return null;
	} else if (previousEnd !== void 0) start = previousEnd;
	else return null;
	return {
		start,
		end: start + length - 1
	};
}
/**
* Create AttributeList from raw attribute string.
*/
function createAttributeList(line) {
	const map = parseAttributeList(line);
	return {
		get(key) {
			return map.get(key);
		},
		getInt(key, defaultValue) {
			const value = map.get(key);
			if (value === void 0) return defaultValue;
			const parsed = Number.parseInt(value, 10);
			return Number.isNaN(parsed) ? defaultValue : parsed;
		},
		getFloat(key, defaultValue) {
			const value = map.get(key);
			if (value === void 0) return defaultValue;
			const parsed = Number.parseFloat(value);
			return Number.isNaN(parsed) ? defaultValue : parsed;
		},
		getBool(key) {
			return map.get(key) === "YES";
		},
		getResolution(key) {
			const value = map.get(key);
			if (!value) return void 0;
			return parseResolution(value) ?? void 0;
		},
		getFrameRate(key) {
			const value = map.get(key);
			if (!value) return void 0;
			return parseFrameRate(value);
		}
	};
}
/**
* Match a tag and extract its attributes.
* Returns null if the line doesn't match the tag.
*/
function matchTag(line, tag) {
	const prefix = `#${tag}:`;
	if (!line.startsWith(prefix)) return null;
	return createAttributeList(line.slice(prefix.length));
}
//#endregion
export { createAttributeList, matchTag, parseAttributeList, parseByteRange, parseCodecs, parseExtInfDuration, parseFrameRate, parseResolution };

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