* modules/codec/ffmpeg/ffmpeg.c: avoid a strcmp() in LibavcodecCallback().

modules/codec/ffmpeg/ffmpeg.c

@@ -338,13 +338,16 @@ static void LibavcodecCallback( void *p_opaque, int i_level,
 
     p_avc = p_avctx ? p_avctx->av_class : 0;
 
+#define cln p_avc->class_name
     /* Make sure we can get p_this back */
-    if( !p_avctx || !p_avc || !p_avc->class_name ||
-        strcmp( p_avc->class_name, "AVCodecContext" ) )
+    if( !p_avctx || !p_avc || !cln ||
+        cln[0]!='A' || cln[1]!='V' || cln[2]!='C' || cln[3]!='o' ||
+        cln[4]!='d' || cln[5]!='e' || cln[6]!='c' )
     {
         if( i_level == AV_LOG_ERROR ) vfprintf( stderr, psz_format, va );
         return;
     }
+#undef cln
 
     p_this = (vlc_object_t *)p_avctx->opaque;