From c1dd524919460febdabb17a549cc1e2f5e6a6f22 Mon Sep 17 00:00:00 2001
From: Chris Pearce <chris@pearce.org.nz>
Date: Wed, 13 Oct 2010 20:10:37 +1300
Subject: [PATCH] Backed out changeset 00382c4a8b22 a=backout

---
 .../media/nsBuiltinDecoderStateMachine.cpp    | 28 ++++++++++++++-----
 content/media/nsBuiltinDecoderStateMachine.h  |  5 ++++
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/content/media/nsBuiltinDecoderStateMachine.cpp b/content/media/nsBuiltinDecoderStateMachine.cpp
index 5dcbf083a86..a768335fe49 100644
--- a/content/media/nsBuiltinDecoderStateMachine.cpp
+++ b/content/media/nsBuiltinDecoderStateMachine.cpp
@@ -151,6 +151,7 @@ nsBuiltinDecoderStateMachine::nsBuiltinDecoderStateMachine(nsBuiltinDecoder* aDe
   mSeekable(PR_TRUE),
   mPositionChangeQueued(PR_FALSE),
   mAudioCompleted(PR_FALSE),
+  mBufferExhausted(PR_FALSE),
   mGotDurationFromMetaData(PR_FALSE),
   mStopDecodeThreads(PR_TRUE),
   mEventManager(aDecoder)
@@ -274,6 +275,10 @@ void nsBuiltinDecoderStateMachine::DecodeLoop()
 
     if (videoPlaying && !videoWait) {
       videoPlaying = mReader->DecodeVideoFrame(skipToNextKeyframe, currentTime);
+      {
+        MonitorAutoEnter mon(mDecoder->GetMonitor());
+        mBufferExhausted = mDecoder->mDecoderPosition > initialDownloadPosition;
+      }
     }
     {
       MonitorAutoEnter mon(mDecoder->GetMonitor());
@@ -284,6 +289,10 @@ void nsBuiltinDecoderStateMachine::DecodeLoop()
 
     if (audioPlaying && !audioWait) {
       audioPlaying = mReader->DecodeAudioData();
+      {
+        MonitorAutoEnter mon(mDecoder->GetMonitor());
+        mBufferExhausted = mDecoder->mDecoderPosition > initialDownloadPosition;
+      }
     }
 
     {
@@ -305,6 +314,9 @@ void nsBuiltinDecoderStateMachine::DecodeLoop()
       {
         // All active bitstreams' decode is well ahead of the playback
         // position, we may as well wait for the playback to catch up.
+        // Set mBufferExhausted to PR_FALSE, as we'll receive more data
+        // while we wait.
+        mBufferExhausted = PR_FALSE;
         mon.Wait();
       }
     }
@@ -847,14 +859,13 @@ PRInt64 nsBuiltinDecoderStateMachine::AudioDecodedMs() const
 
 PRBool nsBuiltinDecoderStateMachine::HasLowDecodedData() const
 {
-  return ((HasAudio() &&
-           !mReader->mAudioQueue.IsFinished() &&
-           AudioDecodedMs() < LOW_AUDIO_MS)
-          ||
+  // We consider ourselves low on decoded data if we're low on audio, or
+  // if we're only playing video and we're low on video frames.
+  return (HasAudio() && AudioDecodedMs() < LOW_AUDIO_MS)
+         ||
          (!HasAudio() &&
           HasVideo() &&
-          !mReader->mVideoQueue.IsFinished() &&
-          (PRUint32)mReader->mVideoQueue.GetSize() < LOW_VIDEO_FRAMES));
+          (PRUint32)mReader->mVideoQueue.GetSize() < LOW_VIDEO_FRAMES);
 }
 
 PRBool nsBuiltinDecoderStateMachine::HasAmpleDecodedData() const
@@ -957,7 +968,8 @@ nsresult nsBuiltinDecoderStateMachine::Run()
         if (mState != DECODER_STATE_DECODING)
           continue;
 
-        if (HasLowDecodedData() &&
+        if (mBufferExhausted &&
+            HasLowDecodedData() &&
             mDecoder->GetState() == nsBuiltinDecoder::PLAY_STATE_PLAYING &&
             !stream->IsDataCachedToEndOfStream(mDecoder->mDecoderPosition) &&
             !stream->IsSuspended())
@@ -1061,6 +1073,7 @@ nsresult nsBuiltinDecoderStateMachine::Run()
           stopEvent = NS_NewRunnableMethod(mDecoder, &nsBuiltinDecoder::SeekingStopped);
           mState = DECODER_STATE_DECODING;
         }
+        mBufferExhausted = PR_FALSE;
         mDecoder->GetMonitor().NotifyAll();
 
         {
@@ -1423,6 +1436,7 @@ void nsBuiltinDecoderStateMachine::LoadMetadata()
 void nsBuiltinDecoderStateMachine::StartBuffering()
 {
   mDecoder->GetMonitor().AssertCurrentThreadIn();
+  mBufferExhausted = PR_TRUE;
   if (IsPlaying()) {
     StopPlayback(AUDIO_PAUSE);
     mDecoder->GetMonitor().NotifyAll();
diff --git a/content/media/nsBuiltinDecoderStateMachine.h b/content/media/nsBuiltinDecoderStateMachine.h
index c5aa9b8887c..353973ff4b4 100644
--- a/content/media/nsBuiltinDecoderStateMachine.h
+++ b/content/media/nsBuiltinDecoderStateMachine.h
@@ -476,6 +476,11 @@ protected:
   // the state machine thread. Synchronised via decoder monitor.
   PRPackedBool mAudioCompleted;
 
+  // PR_TRUE if the decode thread has indicated that we need to buffer.
+  // Accessed by the decode thread and the state machine thread.
+  // Synchronised via the decoder monitor.
+  PRPackedBool mBufferExhausted;
+
   // PR_TRUE if mDuration has a value obtained from an HTTP header, or from
   // the media index/metadata. Accessed on the state machine thread.
   PRPackedBool mGotDurationFromMetaData;