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/WVMMediaSource.h

@@ -38,6 +38,8 @@ public:
     virtual status_t setBuffers(const Vector<MediaBuffer *> &buffers);
     virtual status_t read(MediaBuffer **buffer, const ReadOptions *options = NULL);
 
+    void addEncryptedSize(size_t size) { mEncryptedSizes.push_back(size); }
+
     static int sLastError;
 
 #ifdef REQUIRE_SECURE_BUFFERS
@@ -53,10 +55,13 @@ public:
         static const int kCryptoBlockSize = 16;
         unsigned char mIV[kCryptoBlockSize];
     };
-    static WVStatus DecryptCallback(WVEsSelector esType, void* input, void* output, size_t length,
-                                        int key, unsigned long long dts, unsigned long long pts, bool au_end);
 
-    static DecryptContext sDecryptContext[2]; // audio vs. video
+    static WVStatus DecryptCallback(WVEsSelector esType, void* input, void* output, size_t length,
+                                    int key, unsigned long long dts, unsigned long long pts,
+                                    bool au_end, void *context);
+    DecryptContext& getDecryptContext() { return mDecryptContext; }
+private:
+    DecryptContext mDecryptContext;
 #endif
 
 protected:
@@ -74,6 +79,7 @@ private:
     bool mLogOnce;
     bool mIsLiveStream;
     bool mNewSegment;
+    bool mCryptoPluginMode;
 
     MediaBufferGroup *mGroup;
 
@@ -83,6 +89,8 @@ private:
     sp<WVMFileSource> mFileSource;
     sp<DataSource> mDataSource;
 
+    Vector<size_t> mEncryptedSizes;
+
     void allocBufferGroup();
 
     WVMMediaSource(const WVMMediaSource &);