m3u8parse/lib/playlist-main.js

Structural parsing of Apple HTTP Live Streaming .m3u8 format

import { AttrList } from "./attrlist.js";
import { BasePlaylist, cloneAttrArray, cloneAttrMap, isStringish, rewriteAttrs, rewriteMappedAttrs } from "./playlist-base.js";
export class MainPlaylist extends BasePlaylist {
    static cast(index) {
        if (!index.master) {
            throw new Error('Cannot cast a media playlist');
        }
        return index;
    }
    constructor(obj) {
        obj ?? (obj = {});
        super(obj);
        this.master = true;
        if (obj.master !== undefined && !!obj.master !== this.master) {
            throw new Error('Cannot create from media playlist');
        }
        this.variants = obj.variants?.map((variant) => ({ uri: variant.uri, info: new AttrList(variant.info) })) ?? [];
        this.groups = cloneAttrMap(obj.groups);
        this.iframes = cloneAttrArray(obj.iframes);
        this.data = cloneAttrMap(obj.data);
        this.session_keys = cloneAttrArray(obj.session_keys);
    }
    rewriteUris(mapFn) {
        for (const variant of this.variants) {
            const newUri = mapFn(variant.uri, 'variant', variant);
            if (isStringish(newUri)) {
                variant.uri = newUri;
            }
        }
        rewriteAttrs(mapFn, this.iframes, 'iframe');
        rewriteMappedAttrs(mapFn, this.groups, 'group');
        rewriteMappedAttrs(mapFn, this.data, 'data');
        rewriteAttrs(mapFn, this.session_keys, 'session-key');
        return this;
    }
}