ff* tools: move descriptions from copyright header to @file doxy

ffmpeg.c

 /*
- * ffmpeg main
  * Copyright (c) 2000-2003 Fabrice Bellard
  *
  * This file is part of FFmpeg.
@@ -19,6 +18,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/**
+ * @file
+ * multimedia converter based on the FFmpeg libraries
+ */
+
 #include "config.h"
 #include <ctype.h>
 #include <string.h>

ffplay.c

 /*
- * ffplay : Simple Media Player based on the FFmpeg libraries
  * Copyright (c) 2003 Fabrice Bellard
  *
  * This file is part of FFmpeg.
@@ -19,6 +18,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/**
+ * @file
+ * simple media player based on the FFmpeg libraries
+ */
+
 #include "config.h"
 #include <inttypes.h>
 #include <math.h>

ffprobe.c

 /*
- * ffprobe : Simple Media Prober based on the FFmpeg libraries
  * Copyright (c) 2007-2010 Stefano Sabatini
  *
  * This file is part of FFmpeg.
@@ -19,6 +18,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/**
+ * @file
+ * simple media prober based on the FFmpeg libraries
+ */
+
 #include "config.h"
 
 #include "libavformat/avformat.h"

ffserver.c

 /*
- * Multiple format streaming server
  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  *
  * This file is part of FFmpeg.
@@ -19,6 +18,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/**
+ * @file
+ * multiple format streaming server based on the FFmpeg libraries
+ */
+
 #include "config.h"
 #if !HAVE_CLOSESOCKET
 #define closesocket close