Bug 980868 - Don't skip video frame when |clock time| is less than |mVideoFrameEndTime| for we are still in the safe range without underruning video frames. r=cpearce

content/media/MediaDecoderStateMachine.cpp

@@ -591,6 +591,9 @@ MediaDecoderStateMachine::DecodeVideo()
       ((!mIsAudioPrerolling && mIsAudioDecoding &&
         GetDecodedAudioDuration() < mLowAudioThresholdUsecs * mPlaybackRate) ||
         (!mIsVideoPrerolling && mIsVideoDecoding &&
+         // don't skip frame when |clock time| <= |mVideoFrameEndTime| for
+         // we are still in the safe range without underrunning video frames
+         GetClock() > mVideoFrameEndTime &&
         (static_cast<uint32_t>(mReader->VideoQueue().GetSize())
           < LOW_VIDEO_FRAMES * mPlaybackRate))) &&
       !HasLowUndecodedData())

content/media/test/mochitest.ini

@@ -432,7 +432,6 @@ skip-if = buildapp == 'b2g' # b2g(Test timed out, bug 668973?) b2g-debug(Test ti
 [test_reset_src.html]
 [test_streams_autoplay.html]
 [test_streams_element_capture.html]
-skip-if = buildapp == 'b2g' # b2g(bug 900172 - timeouts) b2g-debug(bug 900172 - timeouts) b2g-desktop(bug 900172 - timeouts)
 [test_streams_element_capture_reset.html]
 skip-if = buildapp == 'b2g' # b2g(bug 901102) b2g-debug(bug 901102) b2g-desktop(bug 901102)
 [test_streams_element_capture_createObjectURL.html]