Bug 1502927 - Remove MediaStream.currentTime. r=baku,jib

This has never been specced and is unused appart from our tests.

Differential Revision: https://phabricator.services.mozilla.com/D10082

--HG--
extra : rebase_source : c044f11325ec630dcabb673c85531a2283ff6ad4
extra : source : db3c2a88f79cb28440f4e13bcf27c5165c6ee060

browser/components/resistfingerprinting/test/mochitest/test_reduce_time_precision.html

@@ -15,20 +15,12 @@ https://trac.torproject.org/projects/tor/ticket/1517
 <a target="_blank" href="https://trac.torproject.org/projects/tor/ticket/1517">Tor Bug 1517</a>
 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1424341">Mozilla Bug 1424341</a>
 
-<!-- Canvas for testing 'currentTime' -->
-<canvas id="test-canvas" width="100" height="100"></canvas>
-
 <!-- The main testing script -->
 <script type="application/javascript">
   SimpleTest.requestFlakyTimeout("testing JS time-based fingerprinting");
 
   // Prepare for test of AudioContext.currentTime
   let audioContext = new AudioContext();
-  // Prepare for test of CanvasStream.currentTime
-  let canvas = document.getElementById("test-canvas");
-  let context = canvas.getContext("2d");
-  context.fillText("test", 20, 20);
-  let canvasStream = canvas.captureStream(25);
 
   // Known ways to generate time stamps, in milliseconds
   const timeStampCodes = [
@@ -40,7 +32,6 @@ https://trac.torproject.org/projects/tor/ticket/1517
   // These are measured in seconds, so we need to scale them up
   var timeStampCodesDOM = timeStampCodes.concat([
     "audioContext.currentTime * 1000",
-    "canvasStream.currentTime * 1000",
   ]);
 
   let isRounded = (x, expectedPrecision) => {

dom/media/DOMMediaStream.cpp

@@ -32,23 +32,10 @@
 #include "nsRFPService.h"
 #include "nsServiceManagerUtils.h"
 
-// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
-// GetTickCount() and conflicts with NS_DECL_NSIDOMMEDIASTREAM, containing
-// currentTime getter.
-#ifdef GetCurrentTime
-#undef GetCurrentTime
-#endif
-
 #ifdef LOG
 #undef LOG
 #endif
 
-// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
-// GetTickCount() and conflicts with MediaStream::GetCurrentTime.
-#ifdef GetCurrentTime
-#undef GetCurrentTime
-#endif
-
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::layers;
@@ -414,9 +401,9 @@ NS_INTERFACE_MAP_END_INHERITING(DOMMediaStream)
 
 DOMMediaStream::DOMMediaStream(nsPIDOMWindowInner* aWindow,
                                MediaStreamTrackSourceGetter* aTrackSourceGetter)
-  : mLogicalStreamStartTime(0), mWindow(aWindow),
-    mInputStream(nullptr), mOwnedStream(nullptr), mPlaybackStream(nullptr),
-    mTracksPendingRemoval(0), mTrackSourceGetter(aTrackSourceGetter),
+  : mWindow(aWindow), mInputStream(nullptr), mOwnedStream(nullptr),
+    mPlaybackStream(nullptr), mTracksPendingRemoval(0),
+    mTrackSourceGetter(aTrackSourceGetter),
     mPlaybackTrackListener(MakeAndAddRef<PlaybackTrackListener>(this)),
     mTracksCreated(false), mNotifiedOfMediaStreamGraphShutdown(false),
     mActive(false), mSetInactiveOnFinish(false), mCORSMode(CORS_NONE)
@@ -565,20 +552,6 @@ DOMMediaStream::Constructor(const GlobalObject& aGlobal,
   return newStream.forget();
 }
 
-double
-DOMMediaStream::CurrentTime()
-{
-  if (!mPlaybackStream) {
-    return 0.0;
-  }
-  // The value of a MediaStream's CurrentTime will always advance forward; it will never
-  // reset (even if one rewinds a video.) Therefore we can use a single Random Seed
-  // initialized at the same time as the object.
-  return nsRFPService::ReduceTimePrecisionAsSecs(mPlaybackStream->
-    StreamTimeToSeconds(mPlaybackStream->GetCurrentTime() - mLogicalStreamStartTime),
-    GetRandomTimelineSeed());
-}
-
 already_AddRefed<Promise>
 DOMMediaStream::CountUnderlyingStreams(const GlobalObject& aGlobal, ErrorResult& aRv)
 {

dom/media/DOMMediaStream.h

@@ -19,12 +19,6 @@
 #include "mozilla/RelativeTimeline.h"
 #include "PrincipalChangeObserver.h"
 
-// X11 has a #define for CurrentTime. Unbelievable :-(.
-// See dom/media/webaudio/AudioContext.h for more fun!
-#ifdef CurrentTime
-#undef CurrentTime
-#endif
-
 namespace mozilla {
 
 class AbstractThread;
@@ -357,8 +351,6 @@ public:
               const dom::Sequence<OwningNonNull<MediaStreamTrack>>& aTracks,
               ErrorResult& aRv);
 
-  double CurrentTime();
-
   static already_AddRefed<dom::Promise>
   CountUnderlyingStreams(const dom::GlobalObject& aGlobal, ErrorResult& aRv);
 
@@ -522,11 +514,6 @@ public:
                                   nsIPrincipal* aPrincipal,
                                   MediaStreamGraph* aGraph);
 
-  void SetLogicalStreamStartTime(StreamTime aTime)
-  {
-    mLogicalStreamStartTime = aTime;
-  }
-
   /**
    * Adds a MediaStreamTrack to mTracks and raises "addtrack".
    *
@@ -662,9 +649,6 @@ protected:
   // the principal changes.
   void RecomputePrincipal();
 
-  // StreamTime at which the currentTime attribute would return 0.
-  StreamTime mLogicalStreamStartTime;
-
   // We need this to track our parent object.
   nsCOMPtr<nsPIDOMWindowInner> mWindow;
 

dom/media/MediaManager.cpp

@@ -1312,10 +1312,6 @@ public:
         return;
       }
 
-      // Start currentTime from the point where this stream was successfully
-      // returned.
-      aStream->SetLogicalStreamStartTime(aStream->GetPlaybackStream()->GetCurrentTime());
-
       // This is safe since we're on main-thread, and the windowlist can only
       // be invalidated from the main-thread (see OnNavigation)
       LOG(("Returning success for getUserMedia()"));

dom/media/PeerConnection.js

@@ -1221,9 +1221,6 @@ class RTCPeerConnection {
   }
 
   addTrack(track, stream) {
-    if (stream.currentTime === undefined) {
-      throw new this._win.DOMException("invalid stream.", "InvalidParameterError");
-    }
     this._checkClosed();
 
     if (this._transceivers.some(

dom/media/test/test_streams_element_capture.html

@@ -38,7 +38,6 @@ function startTest(test) {
   var stream;
 
   var checkEnded = function() {
-    is(stream.currentTime, vout.currentTime, test.name + " stream final currentTime");
     if (test.duration) {
       isGreaterThanOrEqualEps(vout.currentTime, test.duration,
          test.name + " current time at end");
@@ -58,7 +57,6 @@ function startTest(test) {
 
   var onloadedmetadata = function (ev) {
     stream = v.mozCaptureStreamUntilEnded();
-    is(stream.currentTime, 0, test.name + " stream initial currentTime");
     vout.srcObject = stream;
     is(vout.srcObject, stream, test.name + " set output element .srcObject correctly");
     v.play();

dom/media/tests/mochitest/mediaStreamPlayback.js

@@ -92,12 +92,10 @@ MediaStreamPlayback.prototype = {
    * Verifies that media is playing.
    */
   verifyPlaying : function() {
-    var lastStreamTime = this.mediaStream.currentTime;
     var lastElementTime = this.mediaElement.currentTime;
 
     var mediaTimeProgressed = listenUntil(this.mediaElement, 'timeupdate',
-        () => this.mediaStream.currentTime > lastStreamTime &&
-              this.mediaElement.currentTime > lastElementTime);
+        () => this.mediaElement.currentTime > lastElementTime);
 
     return timeout(Promise.all([this.canPlayThroughFired, mediaTimeProgressed]),
                    VERIFYPLAYING_TIMEOUT_LENGTH, "verifyPlaying timed out")

dom/media/tests/mochitest/test_peerConnection_callbacks.html

@@ -75,7 +75,7 @@ runNetworkTest(function() {
     .then(() => pcall(pc1, pc1.setRemoteDescription, pc2.localDescription))
     .then(() => delivered)
   //    .then(() => canPlayThrough)    // why doesn't this fire?
-    .then(() => waitUntil(() => v2.currentTime > 0 && v2.srcObject.currentTime > 0))
+    .then(() => waitUntil(() => v2.currentTime > 0))
     .then(() => ok(v2.currentTime > 0, "v2.currentTime is moving (" + v2.currentTime + ")"))
     .then(() => ok(true, "Connected."))
     .then(() => pcall(pc1, pc1.getStats, null))

dom/media/tests/mochitest/test_peerConnection_promiseSendOnly.html

@@ -51,7 +51,7 @@
     .then(() => pc1.setRemoteDescription(pc2.localDescription))
     .then(() => delivered)
 //    .then(() => canPlayThrough)    // why doesn't this fire?
-    .then(() => waitUntil(() => v2.currentTime > 0 && v2.srcObject.currentTime > 0))
+    .then(() => waitUntil(() => v2.currentTime > 0))
     .then(() => ok(v2.currentTime > 0, "v2.currentTime is moving (" + v2.currentTime + ")"))
     .then(() => ok(true, "Connected."))
     .catch(reason => ok(false, "unexpected failure: " + reason))

dom/media/tests/mochitest/test_peerConnection_scaleResolution.html

@@ -64,7 +64,7 @@
 
     await v2loadedmetadata;
 
-    await waitUntil(() => v2.currentTime > 0 && v2.srcObject.currentTime > 0);
+    await waitUntil(() => v2.currentTime > 0);
     ok(v2.currentTime > 0, "v2.currentTime is moving (" + v2.currentTime + ")");
 
     ok(v1.videoWidth > 0, "source width is positive");

dom/webidl/MediaStream.webidl

@@ -39,7 +39,6 @@ interface MediaStream : EventTarget {
     readonly    attribute boolean      active;
                 attribute EventHandler onaddtrack;
                 attribute EventHandler onremovetrack;
-    readonly attribute double currentTime;
 
     [ChromeOnly, Throws]
     static Promise<long> countUnderlyingStreams();