Add codec id for Flash screen codec v2 and hook it up in FLV demuxer

Originally committed as revision 20563 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -199,6 +199,7 @@ enum CodecID {
     CODEC_ID_DPX,
     CODEC_ID_MAD,
     CODEC_ID_FRWU,
+    CODEC_ID_FLASHSV2,
 
     /* various PCM "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,

libavformat/flvdec.c

@@ -82,6 +82,7 @@ static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_co
     switch(flv_codecid) {
         case FLV_CODECID_H263  : vcodec->codec_id = CODEC_ID_FLV1   ; break;
         case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
+        case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
         case FLV_CODECID_VP6   : vcodec->codec_id = CODEC_ID_VP6F   ;
         case FLV_CODECID_VP6A  :
             if(flv_codecid == FLV_CODECID_VP6A)