Cannot Rewind WVM in MediaCodec Mode

The solution previously checked in as 2e0e3 is re-introduced here. However,
the MediaCodec-compatible heuristic is not used unless WVM is in Crypto Plugin
(i.e. Media Codec) mode.

To repeat from last time: The problem here is that WVM cannot independently
seek the audio and video read heads, but the API assumes it can. WVM does the
right thing for AwesomePlayer-based playback (essentially ignoring audio
seeks) but the wrong thing for MediaCodec-based playback. For MediaCodec
mode, we should respect the first seek we get for a given destination and
ignore the second.

In this part, the new heuristic is reintroduced, but the old heuristic is
maintained for use in non-Crypto Plugin mode.

Bug: 6793514
Change-Id: I7ced2bf20af117a57eec27490b0920d906a8a684

proprietary/wvm/include/WVMMediaSource.h

@@ -26,7 +26,8 @@ class WVMFileSource;
 class WVMMediaSource : public MediaSource {
 public:
     WVMMediaSource(WVSession *session, WVEsSelector esSelector,
-                   const sp<MetaData> &metaData, bool isLive, bool cryptoPluginMode);
+                   const sp<MetaData> &metaData, bool isLive,
+                   bool cryptoPluginMode);
 
     void delegateFileSource(sp<WVMFileSource> fileSource);
     void delegateDataSource(sp<DataSource> dataSource);
@@ -76,6 +77,7 @@ protected:
 
 private:
     Mutex mLock;
+    static int64_t sLastSeekTimeUs;
 
     WVSession *mSession;
     WVEsSelector mESSelector;  // indicates audio vs. video
@@ -88,6 +90,7 @@ private:
     bool mNewSegment;
     bool mCryptoInitialized;
     bool mStripADTS;
+    bool mCryptoPluginMode;
 
     MediaBufferGroup *mGroup;