Direct api to the native media player.

MediaPlayer.java has 3 new methods:
* newRequest creates a Parcel that can be used to send data to the
  native player using invoke.
* invoke issues synchronous calls to the native player using opaque
  parcels for the request and reply.

IMediaPlayer.h has 1 new abstract method:
* invoke

The Midi and Vorbis players have a stub for these. So far only PV
makes use of that new feature.

To avoid any copy overhead, the JNI interface uses Parcel as a java
object (no serialization/copy happens at the JNI layer).

The remote interface token is inserted when the Parcel is constructed
in java. That way the parcel is already routable when it reaches
 IMediaPlayer.cpp (proxy). No extra copy is needed there.

1 files changed, 11 insertions, 2 deletions

diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 7bf555a..21600b2 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -27,12 +27,15 @@
 
 namespace android {
 
+class Parcel;
+
 enum player_type {
     PV_PLAYER = 1,
     SONIVOX_PLAYER = 2,
     VORBIS_PLAYER = 3
 };
 
+
 #define DEFAULT_AUDIOSINK_BUFFERCOUNT 4
 #define DEFAULT_AUDIOSINK_BUFFERSIZE 1200
 #define DEFAULT_AUDIOSINK_SAMPLERATE 44100
@@ -45,7 +48,6 @@ typedef void (*notify_callback_f)(void* cookie, int msg, int ext1, int ext2);
 class MediaPlayerBase : public RefBase
 {
 public:
-
     // AudioSink: abstraction layer for audio output
     class AudioSink : public RefBase {
     public:
@@ -88,7 +90,14 @@ public:
     virtual player_type playerType() = 0;
     virtual void        setNotifyCallback(void* cookie, notify_callback_f notifyFunc) {
                             mCookie = cookie; mNotify = notifyFunc; }
-
+    // Invoke a generic method on the player by using opaque parcels
+    // for the request and reply.
+    // @param request Parcel that is positioned at the start of the
+    //                data sent by the java layer.
+    // @param[out] reply Parcel to hold the reply data. Cannot be null.
+    // @return OK if the invocation was made successfully. A player
+    // not supporting the direct API should return INVALID_OPERATION.
+    virtual status_t    invoke(const Parcel& request, Parcel *reply) = 0;
 protected:
     virtual void        sendEvent(int msg, int ext1=0, int ext2=0) { if (mNotify) mNotify(mCookie, msg, ext1, ext2); }