1 files changed, 143 insertions, 0 deletions
diff --git a/dom/media/test/dash_detect_stream_switch.sjs b/dom/media/test/dash_detect_stream_switch.sjs
new file mode 100644
index 0000000000..b8480a1274
--- /dev/null
+++ b/dom/media/test/dash_detect_stream_switch.sjs
@@ -0,0 +1,143 @@
+/* -*- Mode: JavaScript; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* dash_detect_stream_switch.sjs
+ *
+ * Parses requests for DASH manifests and ensures stream switching takes place
+ * by verifying the subsegments downloaded and the streams they belong to.
+ * If unexpected subsegments (byte ranges) are requested, the script will
+ * will respond with a 404.
+ */
+
+var DEBUG = false;
+
+function parseQuery(request, key) {
+  var params = request.queryString.split("&");
+  if (DEBUG) {
+    dump('DASH-SJS: request params = "' + params + '"\n');
+  }
+  for (var j = 0; j < params.length; ++j) {
+    var p = params[j];
+    if (p == key) {
+      return true;
+    }
+    if (p.indexOf(key + "=") === 0) {
+      return p.substring(key.length + 1);
+    }
+    if (!p.includes("=") && key === "") {
+      return p;
+    }
+  }
+  return false;
+}
+
+function handleRequest(request, response) {
+  try {
+    var name = parseQuery(request, "name");
+    var range = request.hasHeader("Range")
+      ? request.getHeader("Range")
+      : undefined;
+
+    // Should not get request for 1st subsegment from 2nd stream, nor 2nd
+    // subsegment from 1st stream.
+    if (
+      (name == "dash-webm-video-320x180.webm" &&
+        range == "bytes=25514-32767") ||
+      (name == "dash-webm-video-428x240.webm" && range == "bytes=228-35852")
+    ) {
+      throw new Error(
+        "Should not request " + name + " with byte-range " + range
+      );
+    } else {
+      var rangeSplit = range.split("=");
+      if (rangeSplit.length != 2) {
+        throw new Error(
+          "DASH-SJS: ERROR: invalid number of tokens (" +
+            rangeSplit.length +
+            ") delimited by '=' in 'Range' header."
+        );
+      }
+      var offsets = rangeSplit[1].split("-");
+      if (offsets.length != 2) {
+        throw new Error(
+          "DASH-SJS: ERROR: invalid number of tokens (" +
+            offsets.length +
+            ") delimited by '-' in 'Range' header."
+        );
+      }
+      var startOffset = parseInt(offsets[0]);
+      var endOffset = parseInt(offsets[1]);
+      var file = Services.dirsvc.get("CurWorkD", Ci.nsIFile);
+      var fis = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+        Ci.nsIFileInputStream
+      );
+      var bis = Cc["@mozilla.org/binaryinputstream;1"].createInstance(
+        Ci.nsIBinaryInputStream
+      );
+
+      var paths = "tests/dom/media/test/" + name;
+      var split = paths.split("/");
+      for (var i = 0; i < split.length; ++i) {
+        file.append(split[i]);
+      }
+
+      fis.init(file, -1, -1, false);
+      // Exception: start offset should be within file bounds.
+      if (startOffset > file.fileSize) {
+        throw new Error(
+          "Starting offset [" +
+            startOffset +
+            "] is after end of file [" +
+            file.fileSize +
+            "]."
+        );
+      }
+      // End offset may be too large in the MPD. Real world HTTP servers just
+      // return what data they can; do the same here - reduce the end offset.
+      if (endOffset >= file.fileSize) {
+        if (DEBUG) {
+          dump(
+            "DASH-SJS: reducing endOffset [" +
+              endOffset +
+              "] to fileSize [" +
+              (file.fileSize - 1) +
+              "]\n"
+          );
+        }
+        endOffset = file.fileSize - 1;
+      }
+      fis.seek(Ci.nsISeekableStream.NS_SEEK_SET, startOffset);
+      bis.setInputStream(fis);
+
+      var byteLengthToRead = endOffset + 1 - startOffset;
+      var totalBytesExpected = byteLengthToRead + startOffset;
+      if (DEBUG) {
+        dump(
+          "DASH-SJS: byteLengthToRead = " +
+            byteLengthToRead +
+            " byteLengthToRead+startOffset = " +
+            totalBytesExpected +
+            " fileSize = " +
+            file.fileSize +
+            "\n"
+        );
+      }
+
+      var bytes = bis.readBytes(byteLengthToRead);
+      response.setStatusLine(request.httpVersion, 206, "Partial Content");
+      response.setHeader("Content-Length", "" + bytes.length, false);
+      response.setHeader("Content-Type", "application/dash+xml", false);
+      var contentRange =
+        "bytes " + startOffset + "-" + endOffset + "/" + file.fileSize;
+      response.setHeader("Content-Range", contentRange, false);
+      response.write(bytes, bytes.length);
+      bis.close();
+    }
+  } catch (e) {
+    dump("DASH-SJS-ERROR: " + e + "\n");
+    response.setStatusLine(request.httpVersion, 404, "Not found");
+  }
+}