1 #ifndef ANDROID_DVR_VSYNC_SERVICE_H_ 2 #define ANDROID_DVR_VSYNC_SERVICE_H_ 3 4 #include <binder/IInterface.h> 5 6 namespace android { 7 namespace dvr { 8 9 class IVsyncCallback : public IInterface { 10 public: 11 DECLARE_META_INTERFACE(VsyncCallback) 12 13 enum { 14 ON_VSYNC = IBinder::FIRST_CALL_TRANSACTION 15 }; 16 17 virtual status_t onVsync(int64_t vsync_timestamp) = 0; 18 }; 19 20 class BnVsyncCallback : public BnInterface<IVsyncCallback> { 21 public: 22 virtual status_t onTransact(uint32_t code, const Parcel& data, 23 Parcel* reply, uint32_t flags = 0); 24 }; 25 26 // Register a callback with IVsyncService to be notified of vsync events and 27 // timestamps. There's also a shared memory vsync buffer defined in 28 // dvr_shared_buffers.h. IVsyncService has advantages over the vsync shared 29 // memory buffer that make it preferable in certain situations: 30 // 31 // 1. The shared memory buffer lifetime is controlled by VrCore. IVsyncService 32 // is always available as long as surface flinger is running. 33 // 34 // 2. IVsyncService will make a binder callback when a vsync event occurs. This 35 // allows the client to not write code to implement periodic "get the latest 36 // vsync" calls, which is necessary with the vsync shared memory buffer. 37 // 38 // 3. The IVsyncService provides the real vsync timestamp reported by hardware 39 // composer, whereas the vsync shared memory buffer only has predicted vsync 40 // times. 41 class IVsyncService : public IInterface { 42 public: 43 DECLARE_META_INTERFACE(VsyncService) 44 45 static const char* GetServiceName() { return "vrflinger_vsync"; } 46 47 enum { 48 REGISTER_CALLBACK = IBinder::FIRST_CALL_TRANSACTION, 49 UNREGISTER_CALLBACK 50 }; 51 52 virtual status_t registerCallback(const sp<IVsyncCallback> callback) = 0; 53 virtual status_t unregisterCallback(const sp<IVsyncCallback> callback) = 0; 54 }; 55 56 class BnVsyncService : public BnInterface<IVsyncService> { 57 public: 58 virtual status_t onTransact(uint32_t code, const Parcel& data, 59 Parcel* reply, uint32_t flags = 0); 60 }; 61 62 } // namespace dvr 63 } // namespace android 64 65 #endif // ANDROID_DVR_VSYNC_SERVICE_H_ 66
