Bug 1128332: Part3. Re-attempt to decode from last failed position. r=mattwoodrow

--HG--
extra : rebase_source : e583e0255e21c32f5d35a97d17f4dec92e2ba10c

dom/media/mediasource/MediaSourceReader.cpp

@@ -243,6 +243,7 @@ MediaSourceReader::OnAudioNotDecoded(NotDecodedReason aReason)
 
   // If End of stream. Force switching past this stream to another reader by
   // switching to the end of the buffered range.
+  int64_t lastAudioTime = mLastAudioTime;
   if (aReason == END_OF_STREAM && mAudioSourceDecoder) {
     AdjustEndTime(&mLastAudioTime, mAudioSourceDecoder);
   }
@@ -268,6 +269,12 @@ MediaSourceReader::OnAudioNotDecoded(NotDecodedReason aReason)
   }
 
   CheckForWaitOrEndOfStream(MediaData::AUDIO_DATA, mLastAudioTime);
+
+  if (mLastAudioTime - lastAudioTime >= EOS_FUZZ_US) {
+    // No decoders are available to switch to. We will re-attempt from the last
+    // failing position.
+    mLastAudioTime = lastAudioTime;
+  }
 }
 
 nsRefPtr<MediaDecoderReader::VideoDataPromise>
@@ -384,6 +391,7 @@ MediaSourceReader::OnVideoNotDecoded(NotDecodedReason aReason)
 
   // if End of stream. Force switching past this stream to another reader by
   // switching to the end of the buffered range.
+  int64_t lastVideoTime = mLastVideoTime;
   if (aReason == END_OF_STREAM && mVideoSourceDecoder) {
     AdjustEndTime(&mLastVideoTime, mVideoSourceDecoder);
   }
@@ -409,6 +417,12 @@ MediaSourceReader::OnVideoNotDecoded(NotDecodedReason aReason)
   }
 
   CheckForWaitOrEndOfStream(MediaData::VIDEO_DATA, mLastVideoTime);
+
+  if (mLastVideoTime - lastVideoTime >= EOS_FUZZ_US) {
+    // No decoders are available to switch to. We will re-attempt from the last
+    // failing position.
+    mLastVideoTime = lastVideoTime;
+  }
 }
 
 void