media-stream-player/dist/esm/metadata.js

Player built on top of media-stream-library

import { MessageType, utils, components, } from 'media-stream-library';
/**
 * Attach ONVIF metadata handlers to a pipeline
 *
 * @param pipeline The (HTML5 video) pipeline to modify
 * @param handlers The handlers to deal with XML data
 */
export const attachMetadataHandler = (pipeline, { parser, cb }) => {
    /**
     * When a metadata handler is available on this component, it will be
     * called in sync with the player, using a scheduler to synchronize the
     * callback with the video presentation time.
     */
    const scheduler = new utils.Scheduler(pipeline, cb, 30);
    const xmlParser = new DOMParser();
    const xmlMessageHandler = (msg) => {
        const xmlDocument = xmlParser.parseFromString(msg.data.toString(), 'text/xml');
        const newMsg = parser({ ...msg, xmlDocument });
        if (msg.ntpTimestamp !== undefined) {
            scheduler.run(newMsg);
        }
    };
    // Add extra components to the pipeline.
    const onvifDepay = new components.ONVIFDepay();
    const onvifHandlerPipe = components.Tube.fromHandlers((msg) => {
        if (msg.type === MessageType.XML) {
            xmlMessageHandler(msg);
        }
    }, undefined);
    pipeline.insertAfter(pipeline.rtsp, onvifDepay);
    pipeline.insertAfter(onvifDepay, onvifHandlerPipe);
    // Initialize the scheduler when presentation time is ready
    pipeline.onSync = (ntpPresentationTime) => scheduler.init(ntpPresentationTime);
    return scheduler;
};
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