[vdr] [PATCH] Reduce CPU usage during playback

[Jon Burgess <mplayer@jburgess.uklinux.net>]

Here is an experimental two line patch which dramatically reduces the 
CPU load of VDR during playback (not live video). For me, this reduces 
the CPU load for video playback from around 40% to <10%. The CPU load 
for audio drops even more, from around 30% to <1%.

The patch make the dvbplayer thread sleep if it can't get data from the 
non blocking file reader.

It works for me, but probably needs to more thorough testing to make 
sure it doesn't break anything.

The patch is against vdr-1.2.1
My setup is a budget Nova-T card + DXR3-0.20

	Jon
--- dvbplayer.c-bak	2003-06-13 01:41:57.000000000 +0100
+++ dvbplayer.c	2003-06-13 01:41:23.000000000 +0100
@@ -489,6 +489,8 @@
                     LOG_ERROR;
                     break;
                     }
+		 else
+		   usleep(1000); // File reader had no data, sleep to let it catch up
                  }
               else//XXX
                  usleep(1); // this keeps the CPU load low