Fix argument constness for the av_codec_get_id() and

av_codec_get_tag() functions, making them take in input a constant
array, since they're not supposed to change it. Fix some warnings.

Originally committed as revision 15795 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/avformat.h

@@ -694,8 +694,8 @@ void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
 void av_register_all(void);
 
 /** codec tag <-> codec id */
-enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
+enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
-unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
+unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
 
 /* media file input */
 

libavformat/utils.c

@@ -1938,7 +1938,7 @@ enum CodecID codec_get_id(const AVCodecTag *tags, unsigned int tag)
     return CODEC_ID_NONE;
 }
 
-unsigned int av_codec_get_tag(const AVCodecTag *tags[4], enum CodecID id)
+unsigned int av_codec_get_tag(const AVCodecTag * const *tags, enum CodecID id)
 {
     int i;
     for(i=0; tags && tags[i]; i++){
@@ -1948,7 +1948,7 @@ unsigned int av_codec_get_tag(const AVCodecTag *tags[4], enum CodecID id)
     return 0;
 }
 
-enum CodecID av_codec_get_id(const AVCodecTag *tags[4], unsigned int tag)
+enum CodecID av_codec_get_id(const AVCodecTag * const *tags, unsigned int tag)
 {
     int i;
     for(i=0; tags && tags[i]; i++){