Switch the way we configure for MediaPlayer retransmission.

This is a cherry-pick of I6ab07d89b2eeb0650e634b8c3b7a0b36aba4e7dd
with merge conflicts addressed by hand and additional changes made in
response to code review feedback.

Move in the direction of a more publishable API for configuring a
media player for retransmission.  It used to be that we used a custom
invoke and a modified URL (prefixed with aahTX://).  There are many
issues with this technique and it was never meant to stand the test of
time.

This CL gets rid of all that.  A new (but currently hidden) method was
introduced to the java level MediaPlayer API, called
setRetransmitTarget(InetSocketAddress), which allows an app writer to
set the retransmit target.  For now, this method needs to be called
before a call to setDataSource (which is pretty unusual for the
MediaPlayer API) because this mid level code uses this as a cue to
instantiate an aahTX player instead of relying on the data source to
select a player.  When retranmit functionality becomes part of the
existing android player implemenation, this
set-retrans-before-set-data-source behavior can go away, along with
the aahTX player itself.

Change-Id: I3b46c5227bbf69acb2f3cc4f93cfccad9777be98
Signed-off-by: John Grossman <johngro@google.com>
diff --git a/include/media/IMediaPlayer.h b/include/media/IMediaPlayer.h
index 6425886..39d58ab 100644
--- a/include/media/IMediaPlayer.h
+++ b/include/media/IMediaPlayer.h
@@ -23,6 +23,10 @@
 #include <utils/KeyedVector.h>
 #include <system/audio.h>
 
+// Fwd decl to make sure everyone agrees that the scope of struct sockaddr_in is
+// global, and not in android::
+struct sockaddr_in;
+
 namespace android {
 
 class Parcel;
@@ -59,6 +63,7 @@
     virtual status_t        attachAuxEffect(int effectId) = 0;
     virtual status_t        setParameter(int key, const Parcel& request) = 0;
     virtual status_t        getParameter(int key, Parcel* reply) = 0;
+    virtual status_t        setRetransmitEndpoint(const struct sockaddr_in* endpoint) = 0;
 
     // Invoke a generic method on the player by using opaque parcels
     // for the request and reply.
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 23a3e49..f7491d8 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -29,6 +29,10 @@
 #include <media/AudioSystem.h>
 #include <media/Metadata.h>
 
+// Fwd decl to make sure everyone agrees that the scope of struct sockaddr_in is
+// global, and not in android::
+struct sockaddr_in;
+
 namespace android {
 
 class Parcel;
@@ -141,6 +145,14 @@
     virtual status_t    setParameter(int key, const Parcel &request) = 0;
     virtual status_t    getParameter(int key, Parcel *reply) = 0;
 
+    // Right now, only the AAX TX player supports this functionality.  For now,
+    // provide a default implementation which indicates a lack of support for
+    // this functionality to make life easier for all of the other media player
+    // maintainers out there.
+    virtual status_t setRetransmitEndpoint(const struct sockaddr_in* endpoint) {
+        return INVALID_OPERATION;
+    }
+
     // Invoke a generic method on the player by using opaque parcels
     // for the request and reply.
     //
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index d0b87c8..9cd5f9f 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_MEDIAPLAYER_H
 #define ANDROID_MEDIAPLAYER_H
 
+#include <arpa/inet.h>
+
 #include <binder/IMemory.h>
 #include <media/IMediaPlayerClient.h>
 #include <media/IMediaPlayer.h>
@@ -204,6 +206,7 @@
             status_t        attachAuxEffect(int effectId);
             status_t        setParameter(int key, const Parcel& request);
             status_t        getParameter(int key, Parcel* reply);
+            status_t        setRetransmitEndpoint(const char* addrString, uint16_t port);
 
 private:
             void            clear_l();
@@ -212,6 +215,7 @@
             status_t        getDuration_l(int *msec);
             status_t        attachNewPlayer(const sp<IMediaPlayer>& player);
             status_t        reset_l();
+            status_t        doSetRetransmitEndpoint(const sp<IMediaPlayer>& player);
 
     sp<IMediaPlayer>            mPlayer;
     thread_id_t                 mLockThreadId;
@@ -234,6 +238,8 @@
     int                         mVideoHeight;
     int                         mAudioSessionId;
     float                       mSendLevel;
+    struct sockaddr_in          mRetransmitEndpoint;
+    bool                        mRetransmitEndpointValid;
 };
 
 }; // namespace android