import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1249280 - Fix coordinates of APZ-detected gestures when crossing process boundaries. r=kats (090ebc1700)
- Bug 1245016 - b2g build failure in gfx/layers/ipc/LayerAnimationUtils.h r=hiro (a577fdc500)
- 10.5 & 10.6 compatibility (72e2c45a47)
- Bug 1157018 - NsckPuk and PckPuk lock types that should require PUK instead require PIN. r=echen (7a5e5e0fe1)
- Bug 1218721 - Part 1 - Always Insert Name/Number when Providing IccContact Response. r=echen (5348f2b567)
- Bug 1213785 - Fixed test_icc_contact_add.js and test_icc_contact_update.js testcases timeout. r=echen (fb2020a04e)
- Bug 1218721 - Part 2 - Improve Test Coverage. r=echen (124bd4761b)
- Bug 1195273 - Suppress assertion check in ~ErrorResult() if no exception to be thrown. r=echen (c49167db1e)
- Bug 1189884 - Read/Update ANR of SIM Contact Properly. r=echen (037f45bad6)
- Bug 1172873 - Suppress the notification of STK proactive command if there is no Icc detected. r=echen (9099119665)
- var-let (0d751e9ded)
- Bug 1213766 - modify tests to match emulator's new mcc/mnc. r=echen (443412df79)
- Bug 1244480, don't throw when passing random value as the second argument to canvas.getContext, r=bz (892beb551d)
- Bug 591737 - Add pref for details and summary elements. r=bz (20865b31d9)
- remove HTMLSummaryElement binding (c55d1c1e41)
- Bug 1246185 - Do not collapsed <details> when preference off. r=bz (38bba73df0)
- more SummaryElement cleanup (e567f0a554)
- Bug 1176849 - Make the file picker fatally assert if any of the objects returned by the file picker are not nsIDOMBlob objects. r=baku (519cae0e25)
- Bug 1201106 - Make sure that HTMLInputElement.files is always null if the 'directory' attribute is set. r=baku (7a707c3bdc)
- Bug 1239280 - HTMLInputElement::GetFiles should work also if 'directory' attribute is set, r=smaug (fd18ef9377)
- Bug 1207570 - Make HTMLInputElement::GetFilesAndDirectories throw when the type is not file. r=baku (7cf1efc3ec)
- Bug 1238433 - Added telemetry for the proportion of dropped frames. r=cpearce, f=bsmedberg (92af25de66)
- Bug 1240478 - Remove Mutex from MediaStreamSizeListener. r=jesup (b042225707)
- Bug 1240478 - Have MediaStreamSizeListener active immediately, until the initial size is known. r=jesup (6094996687)
- Bug 1241405 - reset mCurrentPlayRangeStart in AbortExistingLoads(). r=jya. (93eb8e67ed)
- Bug 1224936 - AudioChannelAgent should be informed when HTMLMediaElement dispatches an error, r=roc (4f6425922d)
- Bug 1238906 - part1 : check whether audio data is audible. r=jwwang (0ef051dc27)
- Bug 1238906 - part2 : notify audible state from MDSM to ME. r=jwwang (125829a019)
- Bug 1245982 - Added telemetry for the number of uses of HTMLMediaElement.fastSeek(). r=cpearce (34f4bd5490)
- Bug 1233274 - Don't shutdown detached MediaKeys. r=gerald (d73512a2b1)
- Bug 1237616 - Remove the aForceBuffering arugment from MediaDecoder::Resume(). r=cpearce. (97eb603c20)
- Bug 1246521: P1. Add MediaDecoderOwner::HasError method. r=gerald (605905c959)
- Bug 1246521: P2. Add MediaDecoder::OwnerHasError method. r=gerald (0794b84bc2)
- Bug 1246521: [MSE] P3. Only error during Prepare Append algorithm if the media element is in error. r=gerald (5e5f48c50b)
- Bug 1235411 - Remove IsCallerChrome check in HTMLMediaElement::Observe. r=khuey (b68191da8e)

dom/media/MediaDecoderStateMachine.cpp

@@ -116,6 +116,11 @@ static const int AUDIO_DURATION_USECS = 40000;
 // increase it by more.
 static const int THRESHOLD_FACTOR = 2;
 
+// When the continuous silent data is over this threshold, means the a/v does
+// not produce any sound. This time is decided by UX suggestion, see
+// https://bugzilla.mozilla.org/show_bug.cgi?id=1235612#c18
+static const uint32_t SILENT_DATA_THRESHOLD_USECS = 10000000;
+
 namespace detail {
 
 // If we have less than this much undecoded data available, we'll consider
@@ -236,6 +241,7 @@ MediaDecoderStateMachine::MediaDecoderStateMachine(MediaDecoder* aDecoder,
   mOutputStreamManager(new OutputStreamManager()),
   mResource(aDecoder->GetResource()),
   mAudioOffloading(false),
+  mSilentDataDuration(0),
   mBuffered(mTaskQueue, TimeIntervals(),
             "MediaDecoderStateMachine::mBuffered (Mirror)"),
   mEstimatedDuration(mTaskQueue, NullableTimeUnit(),
@@ -272,7 +278,9 @@ MediaDecoderStateMachine::MediaDecoderStateMachine(MediaDecoder* aDecoder,
   mCurrentPosition(mTaskQueue, 0,
                    "MediaDecoderStateMachine::mCurrentPosition (Canonical)"),
   mPlaybackOffset(mTaskQueue, 0,
-                  "MediaDecoderStateMachine::mPlaybackOffset (Canonical)")
+                  "MediaDecoderStateMachine::mPlaybackOffset (Canonical)"),
+  mIsAudioDataAudible(mTaskQueue, false,
+                     "MediaDecoderStateMachine::mIsAudioDataAudible (Canonical)")
 {
   MOZ_COUNT_CTOR(MediaDecoderStateMachine);
   NS_ASSERTION(NS_IsMainThread(), "Should be on main thread.");
@@ -714,14 +722,36 @@ MediaDecoderStateMachine::PushFront(MediaData* aSample, MediaData::Type aSampleT
   UpdateNextFrameStatus();
 }
 
+void
+MediaDecoderStateMachine::CheckIsAudible(const MediaData* aSample)
+{
+  MOZ_ASSERT(OnTaskQueue());
+  MOZ_ASSERT(aSample->mType == MediaData::AUDIO_DATA);
+
+  const AudioData* data = aSample->As<AudioData>();
+  bool isAudible = data->IsAudible();
+  if (isAudible && !mIsAudioDataAudible) {
+    mIsAudioDataAudible = true;
+    mSilentDataDuration = 0;
+  } else if (isAudible && mIsAudioDataAudible) {
+    mSilentDataDuration += data->mDuration;
+    if (mSilentDataDuration > SILENT_DATA_THRESHOLD_USECS) {
+      mIsAudioDataAudible = false;
+      mSilentDataDuration = 0;
+    }
+  }
+}
+
 void
 MediaDecoderStateMachine::OnAudioPopped(const RefPtr<MediaData>& aSample)
 {
   MOZ_ASSERT(OnTaskQueue());
+
   mPlaybackOffset = std::max(mPlaybackOffset.Ref(), aSample->mOffset);
   UpdateNextFrameStatus();
   DispatchAudioDecodeTaskIfNeeded();
   MaybeStartBuffering();
+  CheckIsAudible(aSample);
 }
 
 void
@@ -2183,6 +2213,7 @@ MediaDecoderStateMachine::FinishShutdown()
   mNextFrameStatus.DisconnectAll();
   mCurrentPosition.DisconnectAll();
   mPlaybackOffset.DisconnectAll();
+  mIsAudioDataAudible.DisconnectAll();
 
   // Shut down the watch manager before shutting down our task queue.
   mWatchManager.Shutdown();