[FFmpeg-cvslog] log: Document AV_LOG_C usage

[Luca Barbato]

ffmpeg | branch: master | Luca Barbato <lu_zero at gentoo.org> | Thu Apr  3 13:51:48 2014 +0000| [42ba1c51d9e843135772a3b9e5cf036a37b28bdb] | committer: Vittorio Giovara

log: Document AV_LOG_C usage

And move outside the wrong doxygen group.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=42ba1c51d9e843135772a3b9e5cf036a37b28bdb
---

 libavutil/log.h |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/libavutil/log.h b/libavutil/log.h
index 2f7811c..4e4424a 100644
--- a/libavutil/log.h
+++ b/libavutil/log.h
@@ -144,16 +144,18 @@ typedef struct AVClass {
 #define AV_LOG_DEBUG    48
 
 /**
- * Sets additional colors for extended debugging sessions.
- * Requires 256color terminal support. Use outside debugging is not
- * recommended.
+ * @}
  */
 
-#define AV_LOG_C(x) (x << 8)
-
 /**
- * @}
+ * Sets additional colors for extended debugging sessions.
+ * @code
+   av_log(ctx, AV_LOG_DEBUG|AV_LOG_C(134), "Message in purple\n");
+   @endcode
+ * Requires 256color terminal support. Uses outside debugging is not
+ * recommended.
  */
+#define AV_LOG_C(x) (x << 8)
 
 /**
  * Send the specified message to the log if the level is less than or equal