Implement the SLVolumeItf and SLPlayItf on an AudioPlayer's AudioTrack.
Iplay.c and IVolume.c are temporarily included in sles.c to circumvent
a build issue.
Change-Id: I213fc1d681ca2e7ff158aff876faf980a88292b5

IBufferQueue.c

diff --git a/IBufferQueue.c b/IBufferQueue.c
index 1618812..3b94ee2 100644
--- a/IBufferQueue.c
+++ b/IBufferQueue.c
@@ -53,6 +53,10 @@
     this->mRear = &this->mArray[0];
     this->mSizeConsumed = 0;
     this->mState.count = 0;
+#ifdef USE_ANDROID
+    // FIXME must flush associated player
+    fprintf(stderr, "FIXME: IBufferQueue_Clear must flush associated player, not implemented\n");
+#endif
     interface_unlock_exclusive(this);
     return SL_RESULT_SUCCESS;
 }