From 85626ef1aada82f4628101534200927ba54ed6c7 Mon Sep 17 00:00:00 2001
From: reimar <reimar@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Mon, 27 Jun 2005 10:05:39 +0000
Subject: [PATCH] Try to set XV_SYNC_TO_VBLANK to enable vsync on non-overlay
 xv adapters.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15827 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libvo/vo_xv.c      |  1 +
 libvo/x11_common.c | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/libvo/vo_xv.c b/libvo/vo_xv.c
index e485743dae..a3853d1cca 100644
--- a/libvo/vo_xv.c
+++ b/libvo/vo_xv.c
@@ -917,6 +917,7 @@ static uint32_t preinit(const char *arg)
     {
       return -1; // bail out, colorkey setup failed
     }
+    vo_xv_enable_vsync();
 
     fo = XvListImageFormats(mDisplay, xv_port, (int *) &formats);
 
diff --git a/libvo/x11_common.c b/libvo/x11_common.c
index 50034c2e1e..d40ead6b2a 100644
--- a/libvo/x11_common.c
+++ b/libvo/x11_common.c
@@ -2284,6 +2284,19 @@ static Atom xv_intern_atom_if_exists( char const * atom_name )
 
   return xv_atom;
 }
+
+/**
+ * \brief Try to enable vsync for xv.
+ * \return Returns -1 if not available, 0 on failure and 1 on success.
+ */
+int vo_xv_enable_vsync()
+{
+  Atom xv_atom = xv_intern_atom_if_exists("XV_SYNC_TO_VBLANK");
+  if (xv_atom == None)
+    return -1;
+  return XvSetPortAttribute(mDisplay, xv_port, xv_atom, 1) == Success;
+}
+
 /**
  * \brief Print information about the colorkey method and source.
  *