Move documentation of av_register_all() from allformats.c to

avformat.h, and extend it.

Originally committed as revision 16774 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/allformats.c

@@ -36,12 +36,6 @@
     extern URLProtocol x##_protocol; \
     if(CONFIG_##X##_PROTOCOL) register_protocol(&x##_protocol); }
 
-/* If you do not call this function, then you can select exactly which
-   formats you want to support */
-
-/**
- * Initialize libavformat and register all the (de)muxers and protocols.
- */
 void av_register_all(void)
 {
     static int initialized;

libavformat/avformat.h

@@ -757,6 +757,15 @@ void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
  */
 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
 
+/**
+ * Initialize libavformat and register all the muxers, demuxers and
+ * protocols. If you do not call this function, then you can select
+ * exactly which formats you want to support.
+ *
+ * @see av_register_input_format()
+ * @see av_register_output_format()
+ * @see register_protocol()
+ */
 void av_register_all(void);
 
 /** codec tag <-> codec id */