From f01d10313bbe9ba473a16b1059c02718fed64cda Mon Sep 17 00:00:00 2001
From: JW Wang <jwwang@mozilla.com>
Date: Wed, 27 Jan 2016 15:12:49 +0800
Subject: [PATCH] Bug 1242845 - Make the computation of
 MediaDecoderStateMachine::HasLowUndecodedData() more accurate and consistent.
 r=jya.

---
 dom/media/MediaDecoderStateMachine.cpp | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/dom/media/MediaDecoderStateMachine.cpp b/dom/media/MediaDecoderStateMachine.cpp
index 206cb598fdc8..317039e5de54 100644
--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -1877,14 +1877,17 @@ bool MediaDecoderStateMachine::HasLowUndecodedData(int64_t aUsecs)
     return false;
   }
 
-  int64_t endOfDecodedVideoData = INT64_MAX;
-  if (HasVideo() && !VideoQueue().AtEndOfStream()) {
-    endOfDecodedVideoData = VideoQueue().Peek() ? VideoQueue().Peek()->GetEndTime() : VideoEndTime();
-  }
-  int64_t endOfDecodedAudioData = INT64_MAX;
-  if (HasAudio() && !AudioQueue().AtEndOfStream()) {
-    endOfDecodedAudioData = mDecodedAudioEndTime;
-  }
+  // We are never low in decoded data when we don't have audio/video or have
+  // decoded all audio/video samples.
+  int64_t endOfDecodedVideoData =
+    (HasVideo() && !VideoQueue().IsFinished()) ?
+      mDecodedVideoEndTime :
+      INT64_MAX;
+  int64_t endOfDecodedAudioData =
+    (HasAudio() && !AudioQueue().IsFinished()) ?
+      mDecodedAudioEndTime :
+      INT64_MAX;
+
   int64_t endOfDecodedData = std::min(endOfDecodedVideoData, endOfDecodedAudioData);
   if (Duration().ToMicroseconds() < endOfDecodedData) {
     // Our duration is not up to date. No point buffering.