Add CryptoPluginMode to WV extractor

Allows the WV extractor to run in a mode that is compatible with
the DRM CryptoPlugin HAL API, where decryption is deferred
until the encrypted data is sent through the CryptoPlugin to
the codec.

This patch does:
 (1) Adds a flag mCryptoPluginMode that controls this behavior
     [Note: need framework support to enable/disable this]
 (2) Accumulates information in track metadata to delineate
     crypto unit boundaries for the CryptoPlugin

related-to-bug: 5986621

Change-Id: I3318d5cde38c7b02a7bdb56aca9aece852c9781c

proprietary/wvm/include/WVMExtractorImpl.h

@@ -34,11 +34,18 @@ public:
 
     virtual sp<MetaData> getMetaData();
     virtual int64_t getCachedDurationUs(status_t *finalStatus);
+
     virtual void setAdaptiveStreamingMode(bool adaptive);
     bool getAdaptiveStreamingMode() const;
 
+    virtual void setCryptoPluginMode(bool cryptoPluginMode);
+    bool getCryptoPluginMode() const;
+
     virtual void setUID(uid_t uid);
 
+    sp<WVMMediaSource> getAudioSource() const { return mAudioSource; }
+    sp<WVMMediaSource> getVideoSource() const { return mVideoSource; }
+
     static void SocketInfoCallback(int fd, int op, void *context);
     static void cleanup();
 
@@ -69,6 +76,14 @@ private:
     bool mUIDIsSet;
     uid_t mUID;
 
+    //
+    // if in CryptoPlugin mode, the extractor doesn't decrypt,
+    // it just accumulates the ranges of data requiring decryption
+    // into the MediaBuffer's metadata, the decryption happens
+    // later via the CryptoPlugin
+    //
+    bool mCryptoPluginMode;
+
     status_t readMetaData();
 
     const static size_t kStreamCacheSize = 10 * 1024 * 1024;