m3u8parse/lib/media-segment.js

Structural parsing of Apple HTTP Live Streaming .m3u8 format

import { AttrList } from './attrlist.js';
import { cloneAttrArray, isStringish, rewriteAttr, rewriteAttrs } from './playlist-base.js';
export class MediaSegment {
    constructor(uri, meta, version) {
        if (URL && uri instanceof URL) {
            uri = uri.href;
        }
        if (uri && typeof uri === 'object') {
            meta = uri;
            uri = meta.uri;
            version = 10000;
        }
        meta = meta || {};
        this.duration = meta.duration;
        this.title = meta.title;
        this.uri = uri;
        this.discontinuity = !!meta.discontinuity;
        // optional
        if (meta.program_time) {
            this.program_time = new Date(meta.program_time);
        }
        if (meta.keys) {
            this.keys = cloneAttrArray(meta.keys);
        }
        if (version >= 4 && meta.byterange) {
            this.byterange = { ...meta.byterange };
        }
        if (version >= 5 && meta.map) {
            this.map = new AttrList(meta.map);
        }
        if (meta.bitrate) {
            this.bitrate = meta.bitrate;
        }
        if (meta.gap) {
            this.gap = true; // V8 - ignoreable
        }
        if (meta.parts) {
            this.parts = cloneAttrArray(meta.parts);
        }
        // custom vendor extensions
        if (meta.vendor) {
            if (typeof meta.vendor[Symbol.iterator] !== 'function') {
                // Convert from old style serialized format
                this.vendor = Object.entries(meta.vendor);
            }
            else {
                const set = this.vendor = [];
                for (const [ext, value] of meta.vendor) {
                    set.push([ext, value]);
                }
            }
        }
    }
    isPartial() {
        const full = (this.uri || this.uri === '') && this.duration >= 0;
        return !full;
    }
    rewriteUris(mapFn) {
        rewriteAttrs(mapFn, this.keys, 'segment-key');
        rewriteAttr(mapFn, this.map, 'segment-map');
        rewriteAttrs(mapFn, this.parts, 'segment-part');
        const newUri = mapFn(this.uri, 'segment', this);
        if (isStringish(newUri)) {
            this.uri = newUri;
        }
        return this;
    }
}