Adding Closed caption Support

Signed-off-by: Anshul Maheshwari <anshul.ffmpeg@gmail.com>

To test Closed caption use following command
ffmpeg -f lavfi -i "movie=input.ts[out0+subcc]" -map s output.srt
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/allcodecs.c

@@ -481,6 +481,7 @@ void avcodec_register_all(void)
     /* subtitles */
     REGISTER_ENCDEC (SSA,               ssa);
     REGISTER_ENCDEC (ASS,               ass);
+    REGISTER_DECODER(CCAPTION,          ccaption);
     REGISTER_ENCDEC (DVBSUB,            dvbsub);
     REGISTER_ENCDEC (DVDSUB,            dvdsub);
     REGISTER_DECODER(JACOSUB,           jacosub);