1 #ifndef ANDROID_DVR_VSYNC_H_ 2 #define ANDROID_DVR_VSYNC_H_ 3 4 #include <stdint.h> 5 #include <sys/cdefs.h> 6 7 __BEGIN_DECLS 8 9 typedef struct DvrVSyncClient DvrVSyncClient; 10 11 // Represents a vsync sample. The size of this struct is 32 bytes. 12 typedef struct __attribute__((packed, aligned(16))) DvrVsync { 13 // The timestamp for the last vsync in nanoseconds. 14 uint64_t vsync_timestamp_ns; 15 16 // The index of the last vsync. 17 uint32_t vsync_count; 18 19 // Scan out for the left eye = vsync_timestamp_ns + vsync_left_eye_offset_ns. 20 int32_t vsync_left_eye_offset_ns; 21 22 // Scan out for the right eye = vsync_timestamp_ns + vsync_right_eye_offset_ns 23 int32_t vsync_right_eye_offset_ns; 24 25 // The period of a vsync in nanoseconds. 26 uint32_t vsync_period_ns; 27 28 // Padding to 32 bytes so the size is a multiple of 16. 29 uint8_t padding[8]; 30 } DvrVsync; 31 32 // Creates a new client to the system vsync service. 33 int dvrVSyncClientCreate(DvrVSyncClient** client_out); 34 35 // Destroys the vsync client. 36 void dvrVSyncClientDestroy(DvrVSyncClient* client); 37 38 // Get the estimated timestamp of the next GPU lens warp preemption event in/ 39 // ns. Also returns the corresponding vsync count that the next lens warp 40 // operation will target. 41 int dvrVSyncClientGetSchedInfo(DvrVSyncClient* client, int64_t* vsync_period_ns, 42 int64_t* next_timestamp_ns, 43 uint32_t* next_vsync_count); 44 45 __END_DECLS 46 47 #endif // ANDROID_DVR_VSYNC_H_ 48
