silence warnings

Originally committed as revision 2843 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -1292,7 +1292,7 @@ typedef struct AVCodecContext {
      * - encoding: unused
      * - decoding: set by user, if not set then the native format will always be choosen
      */
-    enum PixelFormat (*get_format)(struct AVCodecContext *s, enum PixelFormat * fmt);
+    enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
 
     /**
      * DTG active format information (additionnal aspect ratio

libavcodec/mpeg12.c

@@ -1306,7 +1306,7 @@ static int mpeg_decode_mb(MpegEncContext *s,
 
         if (HAS_CBP(mb_type)) {
             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
-            if (cbp < 0 || (cbp == 0) && (s->chroma_format < 2) ){
+            if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
                 return -1;
             }

libavcodec/utils.c

@@ -338,7 +338,7 @@ int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, v
     return 0;
 }
 
-enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
+enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
     return fmt[0];
 }