114 lines
4.5 KiB
JavaScript
114 lines
4.5 KiB
JavaScript
/* -*- Mode: JavaScript; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* dash_detect_stream_switch.sjs
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*
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* Parses requests for DASH manifests and ensures stream switching takes place
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* by verifying the subsegments downloaded and the streams they belong to.
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* If unexpected subsegments (byte ranges) are requested, the script will
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* will respond with a 404.
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*/
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var DEBUG = false;
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function parseQuery(request, key) {
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var params = request.queryString.split('&');
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if (DEBUG) {
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dump("DASH-SJS: request params = \"" + params + "\"\n");
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}
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for (var j = 0; j < params.length; ++j) {
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var p = params[j];
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if (p == key)
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return true;
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if (p.indexOf(key + "=") === 0)
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return p.substring(key.length + 1);
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if (p.indexOf("=") < 0 && key === "")
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return p;
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}
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return false;
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}
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function handleRequest(request, response)
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{
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try {
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var name = parseQuery(request, "name");
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var range = request.hasHeader("Range") ? request.getHeader("Range")
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: undefined;
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// Should not get request for 1st subsegment from 2nd stream, nor 2nd
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// subsegment from 1st stream.
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if (name == "dash-webm-video-320x180.webm" && range == "bytes=25514-32767" ||
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name == "dash-webm-video-428x240.webm" && range == "bytes=228-35852")
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{
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throw "Should not request " + name + " with byte-range " + range;
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} else {
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var rangeSplit = range.split("=");
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if (rangeSplit.length != 2) {
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throw "DASH-SJS: ERROR: invalid number of tokens (" + rangeSplit.length +
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") delimited by \'=\' in \'Range\' header.";
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}
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var offsets = rangeSplit[1].split("-");
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if (offsets.length != 2) {
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throw "DASH-SJS: ERROR: invalid number of tokens (" + offsets.length +
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") delimited by \'-\' in \'Range\' header.";
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}
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var startOffset = parseInt(offsets[0]);
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var endOffset = parseInt(offsets[1]);
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var file = Components.classes["@mozilla.org/file/directory_service;1"].
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getService(Components.interfaces.nsIProperties).
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get("CurWorkD", Components.interfaces.nsILocalFile);
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var fis = Components.classes['@mozilla.org/network/file-input-stream;1'].
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createInstance(Components.interfaces.nsIFileInputStream);
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var bis = Components.classes["@mozilla.org/binaryinputstream;1"].
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createInstance(Components.interfaces.nsIBinaryInputStream);
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var paths = "tests/dom/media/test/" + name;
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var split = paths.split("/");
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for (var i = 0; i < split.length; ++i) {
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file.append(split[i]);
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}
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fis.init(file, -1, -1, false);
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// Exception: start offset should be within file bounds.
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if (startOffset > file.fileSize) {
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throw "Starting offset [" + startOffset + "] is after end of file [" +
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file.fileSize + "].";
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}
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// End offset may be too large in the MPD. Real world HTTP servers just
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// return what data they can; do the same here - reduce the end offset.
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if (endOffset >= file.fileSize) {
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if (DEBUG) {
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dump("DASH-SJS: reducing endOffset [" + endOffset + "] to fileSize [" +
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(file.fileSize-1) + "]\n");
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}
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endOffset = file.fileSize-1;
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}
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fis.seek(Components.interfaces.nsISeekableStream.NS_SEEK_SET, startOffset);
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bis.setInputStream(fis);
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var byteLengthToRead = endOffset + 1 - startOffset;
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var totalBytesExpected = byteLengthToRead + startOffset;
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if (DEBUG) {
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dump("DASH-SJS: byteLengthToRead = " + byteLengthToRead +
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" byteLengthToRead+startOffset = " + totalBytesExpected +
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" fileSize = " + file.fileSize + "\n");
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}
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var bytes = bis.readBytes(byteLengthToRead);
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response.setStatusLine(request.httpVersion, 206, "Partial Content");
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response.setHeader("Content-Length", ""+bytes.length, false);
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response.setHeader("Content-Type", "application/dash+xml", false);
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var contentRange = "bytes " + startOffset + "-" + endOffset + "/" +
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file.fileSize;
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response.setHeader("Content-Range", contentRange, false);
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response.write(bytes, bytes.length);
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bis.close();
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}
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} catch (e) {
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dump ("DASH-SJS-ERROR: " + e + "\n");
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response.setStatusLine(request.httpVersion, 404, "Not found");
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}
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}
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