Increase priority of video decoder a little bit, to avoid frame

drops.
When a video out device provides only a little number of video
frames, the video decoder should be scheduled immediately to
provide a decoded frame as soon as possible. Otherwise, the
number of available frames for displaying may go below frame
drop limit and thus resulting in unnecessary frame drops.
(transplanted from 33960e92decd90e6010d904476f9d45b1173153a)

--HG--
extra : transplant_source : 3%96%0E%92%DE%CD%90%E6%01%0D%90Dv%F9%D4%5B%11s%15%3A

1 files changed, 10 insertions, 0 deletions

diff --git a/src/xine-engine/video_decoder.c b/src/xine-engine/video_decoder.c
index c371d7657..c88e01714 100644
--- a/src/xine-engine/video_decoder.c
+++ b/src/xine-engine/video_decoder.c
@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #define XINE_ENGINE_INTERNAL
 
@@ -107,6 +108,15 @@ static void *video_decoder_loop (void *stream_gen) {
   int              prof_video_decode = -1;
   int              prof_spu_decode = -1;
   uint32_t         buftype_unknown = 0;
+
+#ifndef WIN32
+  /* nice(-value) will fail silently for normal users.
+   * however when running as root this may provide smoother
+   * playback. follow the link for more information:
+   * http://cambuca.ldhs.cetuc.puc-rio.br/~miguel/multimedia_sim/
+   */
+  nice(-1);
+#endif /* WIN32 */
   
   if (prof_video_decode == -1)
     prof_video_decode = xine_profiler_allocate_slot ("video decoder");