Simplify conversion to 5-bit ASCII.

Originally committed as revision 21557 to svn://svn.ffmpeg.org/ffmpeg/trunk
15 years ago · 832ec42858
parent c676895fd9
commit 832ec42858
1 changed files with 4 additions and 5 deletions
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@ -283,13 +283,12 @@ int ff_mov_iso639_to_lang(const char *lang, int mp4)
        lang = "und";
    /* 5bit ascii */
    for (i = 0; i < 3; i++) {
-        unsigned char c = (unsigned char)lang[i];
-        if (c < 0x60)
-            return -1;
-        if (c > 0x60 + 0x1f)
+        uint8_t c = lang[i];
+        c -= 0x60;
+        if (c > 0x1f)
            return -1;
        code <<= 5;
-        code |= (c - 0x60);
+        code |= c;
    }
    return code;
 }