s/author/artist/ for ID3

from ffmbc


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20838 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/id3v1.c

@@ -209,7 +209,7 @@ static int parse_tag(AVFormatContext *s, const uint8_t *buf)
           buf[2] == 'G'))
         return -1;
     get_string(s, "title",   buf +  3, 30);
-    get_string(s, "author",  buf + 33, 30);
+    get_string(s, "artist",  buf + 33, 30);
     get_string(s, "album",   buf + 63, 30);
     get_string(s, "year",    buf + 93,  4);
     get_string(s, "comment", buf + 97, 30);

libavformat/id3v2.c

@@ -241,7 +241,7 @@ const AVMetadataConv ff_id3v2_metadata_conv[] = {
     { "TENC", "encoder"},
     { "TIT2", "title"},
     { "TLAN", "language"},
-    { "TPE1", "author"},
+    { "TPE1", "artist"},
     { "TPOS", "disc"},
     { "TPUB", "publisher"},
     { "TRCK", "track"},