rx-player
Version:
Canal+ HTML5 Video Player
115 lines (114 loc) • 5.14 kB
JavaScript
/**
* Copyright 2015 CANAL+ Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { assertUnreachable } from "../../../../utils/assert";
import { parseXml } from "../../../../utils/xml-parser";
import parseMpdIr from "../common";
import { createMPDIntermediateRepresentation } from "./node_parsers/MPD";
import { createPeriodIntermediateRepresentation } from "./node_parsers/Period";
/**
* Parse MPD through the Fast JS parser.
* @param {string} xml - MPD under a string format
* @param {Object} args - Various parsing options and information.
* @returns {Object} - Response returned by the DASH-JS parser.
*/
export default function parseFromString(xml, args) {
const root = parseXml(xml);
const lastChild = root[root.length - 1];
if (lastChild === undefined ||
typeof lastChild === "string" ||
lastChild.tagName !== "MPD") {
throw new Error("DASH Parser: document root should be MPD");
}
const [mpdIR, warnings] = createMPDIntermediateRepresentation(lastChild, xml);
const ret = parseMpdIr(mpdIR, args, warnings);
return processReturn(ret);
/**
* Handle `parseMpdIr` return values, asking for resources if they are needed
* and pre-processing them before continuing parsing.
*
* @param {Object} initialRes
* @returns {Object}
*/
function processReturn(initialRes) {
if (initialRes.type === "done") {
return initialRes;
}
else if (initialRes.type === "needs-clock") {
return {
type: "needs-resources",
value: {
urls: [initialRes.value.url],
format: "string",
continue(loadedClock) {
if (loadedClock.length !== 1) {
throw new Error("DASH parser: wrong number of loaded ressources.");
}
const newRet = initialRes.value.continue(loadedClock[0].responseData);
return processReturn(newRet);
},
},
};
}
else if (initialRes.type === "needs-xlinks") {
return {
type: "needs-resources",
value: {
urls: initialRes.value.xlinksUrls,
format: "string",
continue(loadedXlinks) {
const resourceInfos = [];
for (let i = 0; i < loadedXlinks.length; i++) {
const { responseData: xlinkResp, receivedTime, sendingTime, url, } = loadedXlinks[i];
if (!xlinkResp.success) {
throw xlinkResp.error;
}
const wrappedData = "<root>" + xlinkResp.data + "</root>";
const dataAsXML = parseXml(wrappedData);
const innerParsed = dataAsXML[dataAsXML.length - 1];
if (innerParsed === undefined || typeof innerParsed === "string") {
throw new Error("DASH parser: Invalid external ressources");
}
const periods = innerParsed.children;
const periodsIR = [];
const periodsIRWarnings = [];
for (let j = 0; j < periods.length; j++) {
const period = periods[j];
if (typeof period === "string" || period.tagName !== "Period") {
continue;
}
const [periodIR, periodWarnings] = createPeriodIntermediateRepresentation(period, wrappedData);
periodsIRWarnings.push(...periodWarnings);
periodsIR.push(periodIR);
}
resourceInfos.push({
url,
receivedTime,
sendingTime,
parsed: periodsIR,
warnings: periodsIRWarnings,
});
}
const newRet = initialRes.value.continue(resourceInfos);
return processReturn(newRet);
},
},
};
}
else {
assertUnreachable(initialRes);
}
}
}