Add missing prototypes

modules/codec/ffmpeg/avcodec.h

@@ -36,6 +36,18 @@ void CloseAudioEncoder( vlc_object_t * );
 int  OpenDeinterlace( vlc_object_t * );
 void CloseDeinterlace( vlc_object_t * );
 
+void InitLibavcodec( vlc_object_t *p_object );
+
+/* Video Decoder */
+int InitVideoDec( decoder_t *p_dec, AVCodecContext *p_context,
+                  AVCodec *p_codec, int i_codec_id, const char *psz_namecodec );
+void EndVideoDec( decoder_t *p_dec );
+
+/* Audio Decoder */
+int InitAudioDec( decoder_t *p_dec, AVCodecContext *p_context,
+                  AVCodec *p_codec, int i_codec_id, const char *psz_namecodec );
+void EndAudioDec( decoder_t *p_dec );
+
 /*****************************************************************************
  * Module descriptor help strings
  *****************************************************************************/