126 lines
3.1 KiB
JavaScript
126 lines
3.1 KiB
JavaScript
class MediaSourceLoader {
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constructor(url)
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{
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this._url = url;
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this.onload = null;
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this.onerror = null;
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}
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loadManifest()
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{
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return new Promise((resolve, reject) => {
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if (this._manifest) {
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resolve();
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return;
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}
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var request = new XMLHttpRequest();
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request.open('GET', this._url, true);
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request.responseType = 'json';
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request.onload = (event) => {
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this.loadManifestSucceeded(event);
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resolve();
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}
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request.onerror = (event) => {
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this.loadManifestFailed(event);
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reject(event);
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}
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request.send();
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})
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}
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loadManifestSucceeded(event)
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{
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this._manifest = event.target.response;
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if (!this._manifest || !this._manifest.url) {
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if (this.onerror)
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this.onerror();
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return;
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}
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}
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loadManifestFailed()
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{
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if (this.onerror)
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this.onerror();
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}
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loadMediaData()
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{
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return new Promise((resolve, reject) => {
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this.loadManifest().then(() => {
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var request = new XMLHttpRequest();
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request.open('GET', this._manifest.url, true);
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request.responseType = 'arraybuffer';
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request.onload = (event) => {
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this.loadMediaDataSucceeded(event);
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resolve();
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}
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request.onerror = (event) => {
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this.loadMediaDataFailed(event);
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reject(event);
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}
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request.send();
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});
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});
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}
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loadMediaDataSucceeded(event)
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{
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this._mediaData = event.target.response;
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if (this.onload)
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this.onload();
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}
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loadMediaDataFailed()
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{
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if (this.onerror)
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this.onerror();
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}
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get type()
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{
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return this._manifest ? this._manifest.type : "";
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}
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get duration()
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{
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if (!this._manifest)
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return 0;
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return this._manifest.media.reduce((duration, media) => { return duration + media.duration }, 0);
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}
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get initSegment()
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{
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if (!this._manifest || !this._manifest.init || !this._mediaData)
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return null;
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var init = this._manifest.init;
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return this._mediaData.slice(init.offset, init.offset + init.size);
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}
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get mediaSegmentsLength()
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{
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if (!this._manifest || !this._manifest.media)
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return 0;
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return this._manifest.media.length;
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}
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*mediaSegments()
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{
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if (!this._manifest || !this._manifest.media || !this._mediaData)
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return;
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for (var media of this._manifest.media)
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yield this._mediaData.slice(media.offset, media.offset + media.size);
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}
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get everyMediaSegment()
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{
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if (!this._manifest || !this._manifest.media || !this._mediaData)
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return null;
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return this._mediaData.slice(this._manifest.media[0].offset);
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}
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}; |