reduce scores if the mp3 frames dont start from the begin of the file (fixes...

reduce scores if the mp3 frames dont start from the begin of the file (fixes flv deteted as mp3 issues)

Originally committed as revision 6304 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mp3.c

@@ -244,7 +244,7 @@ static void id3_create_tag(AVFormatContext *s, uint8_t *buf)
 
 static int mp3_read_probe(AVProbeData *p)
 {
-    int max_frames;
+    int max_frames, first_frames;
     int fsize, frames;
     uint32_t header;
     uint8_t *buf, *buf2, *end;
@@ -271,10 +271,12 @@ static int mp3_read_probe(AVProbeData *p)
             buf2 += fsize;
         }
         max_frames = FFMAX(max_frames, frames);
+        if(buf == p->buf)
+            first_frames= frames;
     }
-    if     (max_frames>=3) return AVPROBE_SCORE_MAX/2+1;
-    else if(max_frames==2) return AVPROBE_SCORE_MAX/4;
-    else if(max_frames==1) return 1;
+    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
+    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
+    else if(max_frames>=1) return 1;
     else                   return 0;
 }