1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/test/dash_detect_stream_switch.sjs Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,114 @@
1.4 +/* -*- Mode: JavaScript; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/* dash_detect_stream_switch.sjs
1.11 + *
1.12 + * Parses requests for DASH manifests and ensures stream switching takes place
1.13 + * by verifying the subsegments downloaded and the streams they belong to.
1.14 + * If unexpected subsegments (byte ranges) are requested, the script will
1.15 + * will respond with a 404.
1.16 + */
1.17 +
1.18 +var DEBUG = false;
1.19 +
1.20 +function parseQuery(request, key) {
1.21 + var params = request.queryString.split('&');
1.22 + if (DEBUG) {
1.23 + dump("DASH-SJS: request params = \"" + params + "\"\n");
1.24 + }
1.25 + for (var j = 0; j < params.length; ++j) {
1.26 + var p = params[j];
1.27 + if (p == key)
1.28 + return true;
1.29 + if (p.indexOf(key + "=") === 0)
1.30 + return p.substring(key.length + 1);
1.31 + if (p.indexOf("=") < 0 && key === "")
1.32 + return p;
1.33 + }
1.34 + return false;
1.35 +}
1.36 +
1.37 +function handleRequest(request, response)
1.38 +{
1.39 + try {
1.40 + var name = parseQuery(request, "name");
1.41 + var range = request.hasHeader("Range") ? request.getHeader("Range")
1.42 + : undefined;
1.43 +
1.44 + // Should not get request for 1st subsegment from 2nd stream, nor 2nd
1.45 + // subsegment from 1st stream.
1.46 + if (name == "dash-webm-video-320x180.webm" && range == "bytes=25514-32767" ||
1.47 + name == "dash-webm-video-428x240.webm" && range == "bytes=228-35852")
1.48 + {
1.49 + throw "Should not request " + name + " with byte-range " + range;
1.50 + } else {
1.51 + var rangeSplit = range.split("=");
1.52 + if (rangeSplit.length != 2) {
1.53 + throw "DASH-SJS: ERROR: invalid number of tokens (" + rangeSplit.length +
1.54 + ") delimited by \'=\' in \'Range\' header.";
1.55 + }
1.56 + var offsets = rangeSplit[1].split("-");
1.57 + if (offsets.length != 2) {
1.58 + throw "DASH-SJS: ERROR: invalid number of tokens (" + offsets.length +
1.59 + ") delimited by \'-\' in \'Range\' header.";
1.60 + }
1.61 + var startOffset = parseInt(offsets[0]);
1.62 + var endOffset = parseInt(offsets[1]);
1.63 + var file = Components.classes["@mozilla.org/file/directory_service;1"].
1.64 + getService(Components.interfaces.nsIProperties).
1.65 + get("CurWorkD", Components.interfaces.nsILocalFile);
1.66 + var fis = Components.classes['@mozilla.org/network/file-input-stream;1'].
1.67 + createInstance(Components.interfaces.nsIFileInputStream);
1.68 + var bis = Components.classes["@mozilla.org/binaryinputstream;1"].
1.69 + createInstance(Components.interfaces.nsIBinaryInputStream);
1.70 +
1.71 + var paths = "tests/content/media/test/" + name;
1.72 + var split = paths.split("/");
1.73 + for (var i = 0; i < split.length; ++i) {
1.74 + file.append(split[i]);
1.75 + }
1.76 +
1.77 + fis.init(file, -1, -1, false);
1.78 + // Exception: start offset should be within file bounds.
1.79 + if (startOffset > file.fileSize) {
1.80 + throw "Starting offset [" + startOffset + "] is after end of file [" +
1.81 + file.fileSize + "].";
1.82 + }
1.83 + // End offset may be too large in the MPD. Real world HTTP servers just
1.84 + // return what data they can; do the same here - reduce the end offset.
1.85 + if (endOffset >= file.fileSize) {
1.86 + if (DEBUG) {
1.87 + dump("DASH-SJS: reducing endOffset [" + endOffset + "] to fileSize [" +
1.88 + (file.fileSize-1) + "]\n");
1.89 + }
1.90 + endOffset = file.fileSize-1;
1.91 + }
1.92 + fis.seek(Components.interfaces.nsISeekableStream.NS_SEEK_SET, startOffset);
1.93 + bis.setInputStream(fis);
1.94 +
1.95 + var byteLengthToRead = endOffset + 1 - startOffset;
1.96 + var totalBytesExpected = byteLengthToRead + startOffset;
1.97 + if (DEBUG) {
1.98 + dump("DASH-SJS: byteLengthToRead = " + byteLengthToRead +
1.99 + " byteLengthToRead+startOffset = " + totalBytesExpected +
1.100 + " fileSize = " + file.fileSize + "\n");
1.101 + }
1.102 +
1.103 + var bytes = bis.readBytes(byteLengthToRead);
1.104 + response.setStatusLine(request.httpVersion, 206, "Partial Content");
1.105 + response.setHeader("Content-Length", ""+bytes.length, false);
1.106 + response.setHeader("Content-Type", "application/dash+xml", false);
1.107 + var contentRange = "bytes " + startOffset + "-" + endOffset + "/" +
1.108 + file.fileSize;
1.109 + response.setHeader("Content-Range", contentRange, false);
1.110 + response.write(bytes, bytes.length);
1.111 + bis.close();
1.112 + }
1.113 + } catch (e) {
1.114 + dump ("DASH-SJS-ERROR: " + e + "\n");
1.115 + response.setStatusLine(request.httpVersion, 404, "Not found");
1.116 + }
1.117 +}
