Hi Yann, vaPutSurface() is calling DRI2SwapBuffers on X11 to display the image, the behavior is controlled by display server. You may check xf86-video-intel for how is DRI2SwapBuffers implemented.
Thanks Haihao >-----Original Message----- >From: Libva [mailto:libva-boun...@lists.freedesktop.org] On Behalf Of Yann >Dirson >Sent: Sunday, June 26, 2016 11:11 PM >To: libva@lists.freedesktop.org >Subject: [Libva] Disabling sync on vblank > >Hello, > >When I'm decoding a video (using i965-va-driver, libva 1.7.0) and >displaying frames using >vaPutSurface, it looks as if the latter was syncing on vblank: i >observe the frame rate of my >program to be exactly that of the video mode refresh. > >I would like to test if we can do triple-buffering rather than sync on >vblank, and see the >influence on the result. > >It does not look like any parameter honored by other software pieces >(Option VSync of the X intel >driver, XV_SYNC_TO_VBLANK, glx's vblank_mode) has any influence. >I cannot find any explicit reference to vsync or vblank in the libva >or va-driver source code, >and at first read (followed Broadwell path, admitedly quickly) it is >not obvious that the >intel-vaapi-driver exlicitly requires any synchro. Can anyone shed some light >? > >Best regards, >-- >Yann >_______________________________________________ >Libva mailing list >Libva@lists.freedesktop.org >https://lists.freedesktop.org/mailman/listinfo/libva _______________________________________________ Libva mailing list Libva@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/libva
