Decrease returning probe score for WAV demuxer to avoid

probe conflict between WAV and future ACT demuxer.
This is necessary because ACT has standard WAV header
at top of it's own.

Originally committed as revision 12909 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/wav.c

@@ -145,7 +145,12 @@ static int wav_probe(AVProbeData *p)
         p->buf[2] == 'F' && p->buf[3] == 'F' &&
         p->buf[8] == 'W' && p->buf[9] == 'A' &&
         p->buf[10] == 'V' && p->buf[11] == 'E')
-        return AVPROBE_SCORE_MAX;
+        /*
+          Since ACT demuxer has standard WAV header at top of it's own,
+          returning score is decreased to avoid probe conflict
+          between ACT and WAV.
+        */
+        return AVPROBE_SCORE_MAX - 1;
     else
         return 0;
 }