Fix loop and position restoration in static AudioTracks
Allow restoration of loop and position.
Make position and loop synchronously readable.
Bug: 17964637
Change-Id: I8cfb5036e665f55fdff5c67d27e1363ce9a8665d
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index 8389773..0d87cd2 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -85,13 +85,32 @@
typedef SingleStateQueue<StaticAudioTrackState> StaticAudioTrackSingleStateQueue;
+struct StaticAudioTrackPosLoop {
+ // Do not define constructors, destructors, or virtual methods as this is part of a
+ // union in shared memory and will not get called properly.
+
+ // These fields should both be size_t, but since they are located in shared memory we
+ // force to 32-bit. The client and server may have different typedefs for size_t.
+
+ // This struct information is stored in a single state queue to communicate the
+ // static AudioTrack server state to the client while data is consumed.
+ // It is smaller than StaticAudioTrackState to prevent unnecessary information from
+ // being sent.
+
+ uint32_t mBufferPosition;
+ int32_t mLoopCount;
+};
+
+typedef SingleStateQueue<StaticAudioTrackPosLoop> StaticAudioTrackPosLoopQueue;
+
struct AudioTrackSharedStatic {
+ // client requests to the server for loop or position changes.
StaticAudioTrackSingleStateQueue::Shared
mSingleStateQueue;
- // This field should be a size_t, but since it is located in shared memory we
- // force to 32-bit. The client and server may have different typedefs for size_t.
- uint32_t mBufferPosition; // updated asynchronously by server,
- // "for entertainment purposes only"
+ // position info updated asynchronously by server and read by client,
+ // "for entertainment purposes only"
+ StaticAudioTrackPosLoopQueue::Shared
+ mPosLoopQueue;
};
// ----------------------------------------------------------------------------
@@ -355,6 +374,9 @@
void setBufferPositionAndLoop(size_t position, size_t loopStart, size_t loopEnd,
int loopCount);
size_t getBufferPosition();
+ // getBufferPositionAndLoopCount() provides the proper snapshot of
+ // position and loopCount together.
+ void getBufferPositionAndLoopCount(size_t *position, int *loopCount);
virtual size_t getMisalignment() {
return 0;
@@ -366,8 +388,9 @@
private:
StaticAudioTrackSingleStateQueue::Mutator mMutator;
+ StaticAudioTrackPosLoopQueue::Observer mPosLoopObserver;
StaticAudioTrackState mState; // last communicated state to server
- size_t mBufferPosition; // so that getBufferPosition() appears to be synchronous
+ StaticAudioTrackPosLoop mPosLoop; // snapshot of position and loop.
};
// ----------------------------------------------------------------------------
@@ -494,8 +517,7 @@
const StaticAudioTrackState &update) const;
ssize_t pollPosition(); // poll for state queue update, and return current position
StaticAudioTrackSingleStateQueue::Observer mObserver;
- size_t mPosition; // server's current play position in frames, relative to 0
-
+ StaticAudioTrackPosLoopQueue::Mutator mPosLoopMutator;
size_t mFramesReadySafe; // Assuming size_t read/writes are atomic on 32 / 64 bit
// processors, this is a thread-safe version of
// mFramesReady.