Bug 1358969 - let MediaDecoder::CurrentPosition() return a TimeUnit. r=kikuo

We want to replace the use of int64_t for microseconds by TimeUnit
whenever possible since int64_t is ambiguous which could be microseconds
or milliseconds.

MozReview-Commit-ID: K3Bz3uEXLDK

--HG--
extra : rebase_source : ade3cbd61c764b73a22c360572a525127dbadbc5
extra : intermediate-source : 013227a4aa645fc34a82c44130db6c847d74960b
extra : source : 1ab7ce426b557e4ce9979e023f9e84b4690eeaaa

dom/media/MediaDecoder.cpp

@@ -1183,8 +1183,7 @@ MediaDecoder::UpdateLogicalPositionInternal()
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
 
-  double currentPosition =
-    static_cast<double>(CurrentPosition()) / static_cast<double>(USECS_PER_S);
+  double currentPosition = CurrentPosition().ToSeconds();
   if (mPlayState == PLAY_STATE_ENDED) {
     currentPosition = std::max(currentPosition, mDuration);
   }
@@ -1234,7 +1233,7 @@ MediaDecoder::DurationChanged()
     GetOwner()->DispatchAsyncEvent(NS_LITERAL_STRING("durationchange"));
   }
 
-  if (CurrentPosition() > TimeUnit::FromSeconds(mDuration).ToMicroseconds()) {
+  if (CurrentPosition() > TimeUnit::FromSeconds(mDuration)) {
     Seek(mDuration, SeekTarget::Accurate);
   }
 }
@@ -1772,7 +1771,7 @@ MediaDecoder::NextFrameBufferedStatus()
   MOZ_ASSERT(NS_IsMainThread());
   // Next frame hasn't been decoded yet.
   // Use the buffered range to consider if we have the next frame available.
-  TimeUnit currentPosition = TimeUnit::FromMicroseconds(CurrentPosition());
+  auto currentPosition = CurrentPosition();
   media::TimeInterval interval(
     currentPosition,
     currentPosition + DEFAULT_NEXT_FRAME_AVAILABLE_BUFFERED);

dom/media/MediaDecoder.h

@@ -568,9 +568,9 @@ protected:
   // This corresponds to the "current position" in HTML5.
   // We allow omx subclasses to substitute an alternative current position for
   // usage with the audio offload player.
-  virtual int64_t CurrentPosition()
+  virtual media::TimeUnit CurrentPosition()
   {
-    return mCurrentPosition.Ref().ToMicroseconds();
+    return mCurrentPosition.Ref();
   }
 
   // Official duration of the media resource as observed by script.

dom/media/mediasource/MediaSourceDecoder.cpp

@@ -281,7 +281,7 @@ MediaSourceDecoder::NextFrameBufferedStatus()
 
   // Next frame hasn't been decoded yet.
   // Use the buffered range to consider if we have the next frame available.
-  TimeUnit currentPosition = TimeUnit::FromMicroseconds(CurrentPosition());
+  auto currentPosition = CurrentPosition();
   TimeIntervals buffered = GetBuffered();
   buffered.SetFuzz(MediaSourceDemuxer::EOS_FUZZ / 2);
   TimeInterval interval(
@@ -306,7 +306,7 @@ MediaSourceDecoder::CanPlayThrough()
     return false;
   }
   TimeUnit duration = TimeUnit::FromSeconds(mMediaSource->Duration());
-  TimeUnit currentPosition = TimeUnit::FromMicroseconds(CurrentPosition());
+  auto currentPosition = CurrentPosition();
   if (duration.IsInfinite()) {
     // We can't make an informed decision and just assume that it's a live
     // stream