On Tuesday, May 6, 2014 6:08:32 AM UTC-7, Maksym Kreshchuk wrote: > > During video playback hardware vsync enables 10-30 times per minute. > Is it normal value? >
I don't know if there's a "normal". The DispSync code enables hardware VSYNC whenever it believes it is getting too far out of sync. If the display's refresh timing tends to vary a lot then DispSync will enable hardware VSYNC frequently. (Ideally the panel would be able to generate events with a fixed time offset from VSYNC. Without that, we have to fake it in software.) > Also I am interesting how to calculate values for > defines(PRESENT_TIME_OFFSET_FROM_VSYNC_NS, VSYNC_EVENT_PHASE_OFFSET_NS and > SF_VSYNC_EVENT_PHASE_OFFSET_NS)? > Are there some recommended values for these defines? > You can leave VSYNC_EVENT_PHASE_OFFSET_NS and SF_VSYNC_EVENT_PHASE_OFFSET_NS at zero. If you want to experiment, you can try the Nexus 5 values (https://android.googlesource.com/device/lge/hammerhead/+/kitkat-release/BoardConfig.mk): VSYNC_EVENT at 7.5ms, SF_VSYNC_EVENT at 5ms. The PRESENT_TIME_OFFSET_FROM_VSYNC_NS can be determined experimentally; it's the difference between the hardware VSYNC time and the display retire fence time. Most devices use 0, but Nexus 7 (2013) uses 3.2ms (https://android.googlesource.com/device/asus/flo/+/kitkat-release/BoardConfigCommon.mk). -- -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting --- You received this message because you are subscribed to the Google Groups "android-porting" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-porting+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
