avformat: Add AVPROBE_SCORE_EXTENSION define and use where appropriate

36 files changed, 55 insertions, 53 deletions

diff --git a/libavformat/aacdec.c b/libavformat/aacdec.c
index 6f9763facb..8d87ce63ff 100644
--- a/libavformat/aacdec.c
+++ b/libavformat/aacdec.c
@@ -54,9 +54,9 @@ static int adts_aac_probe(AVProbeData *p)
         if(buf == buf0)
             first_frames= frames;
     }
-    if   (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
-    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
-    else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
+    if   (first_frames>=3) return AVPROBE_SCORE_EXTENSION + 1;
+    else if(max_frames>500)return AVPROBE_SCORE_EXTENSION;
+    else if(max_frames>=3) return AVPROBE_SCORE_EXTENSION / 2;
     else if(max_frames>=1) return 1;
     else                   return 0;
 }
diff --git a/libavformat/ac3dec.c b/libavformat/ac3dec.c
index d3f2ec297d..4ceffa54dd 100644
--- a/libavformat/ac3dec.c
+++ b/libavformat/ac3dec.c
@@ -57,7 +57,7 @@ static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id)
     if(codec_id != expected_codec_id) return 0;
     // keep this in sync with mp3 probe, both need to avoid
     // issues with MPEG-files!
-    if (first_frames >= 4) return AVPROBE_SCORE_MAX / 2 + 1;
+    if (first_frames >= 4) return AVPROBE_SCORE_EXTENSION + 1;
 
     if (max_frames) {
         int pes = 0, i;
@@ -78,8 +78,8 @@ static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id)
         if (pes)
             max_frames = (max_frames + pes - 1) / pes;
     }
-    if      (max_frames >  500) return AVPROBE_SCORE_MAX / 2;
-    else if (max_frames >= 4)   return AVPROBE_SCORE_MAX / 4;
+    if      (max_frames >  500) return AVPROBE_SCORE_EXTENSION;
+    else if (max_frames >= 4)   return AVPROBE_SCORE_EXTENSION / 2;
     else if (max_frames >= 1)   return 1;
     else                        return 0;
 }
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 43afa9f526..5d224c4899 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -337,7 +337,9 @@ typedef struct AVProbeData {
     int buf_size;       /**< Size of buf except extra allocated bytes */
 } AVProbeData;
 
-#define AVPROBE_SCORE_MAX 100               ///< maximum score, half of that is used for file-extension-based detection
+#define AVPROBE_SCORE_EXTENSION  50 ///< score for file extension
+#define AVPROBE_SCORE_MAX       100 ///< maximum score
+
 #define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
 
 /// Demuxer will use avio_open, no opened file should be provided by the caller.
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index b235875c53..cf24e8c4e1 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -758,7 +758,7 @@ static int avi_read_header(AVFormatContext *s)
 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
     if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
         uint8_t desc[256];
-        int score = AVPROBE_SCORE_MAX / 2, ret;
+        int score = AVPROBE_SCORE_EXTENSION, ret;
         AVIStream *ast = st->priv_data;
         AVInputFormat *sub_demuxer;
         AVRational time_base;
diff --git a/libavformat/avs.c b/libavformat/avs.c
index 8a3ad388db..b96a122c13 100644
--- a/libavformat/avs.c
+++ b/libavformat/avs.c
@@ -50,7 +50,7 @@ static int avs_probe(AVProbeData * p)
 
     d = p->buf;
     if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
-        return 50;
+        return AVPROBE_SCORE_EXTENSION;
 
     return 0;
 }
diff --git a/libavformat/cavsvideodec.c b/libavformat/cavsvideodec.c
index ed9cdb21f5..fcca9e18b3 100644
--- a/libavformat/cavsvideodec.c
+++ b/libavformat/cavsvideodec.c
@@ -61,7 +61,7 @@ static int cavsvideo_probe(AVProbeData *p)
         }
     }
     if(seq && seq*9<=pic*10)
-        return AVPROBE_SCORE_MAX/2;
+        return AVPROBE_SCORE_EXTENSION;
     return 0;
 }
 
diff --git a/libavformat/dtsdec.c b/libavformat/dtsdec.c
index 28cccd320a..9010711599 100644
--- a/libavformat/dtsdec.c
+++ b/libavformat/dtsdec.c
@@ -60,7 +60,7 @@ static int dts_probe(AVProbeData *p)
     max = markers[2] > markers[max] ? 2 : max;
     if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
         markers[max] * 4 > sum * 3)
-        return AVPROBE_SCORE_MAX/2+1;
+        return AVPROBE_SCORE_EXTENSION + 1;
 
     return 0;
 }
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c
index 1edd88037a..9737095bbb 100644
--- a/libavformat/flacdec.c
+++ b/libavformat/flacdec.c
@@ -281,7 +281,7 @@ static int flac_probe(AVProbeData *p)
 {
     if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
         return 0;
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 AVInputFormat ff_flac_demuxer = {
diff --git a/libavformat/h261dec.c b/libavformat/h261dec.c
index 9b9e3f46a6..4a5805020f 100644
--- a/libavformat/h261dec.c
+++ b/libavformat/h261dec.c
@@ -56,9 +56,9 @@ static int h261_probe(AVProbeData *p)
         }
     }
     if(valid_psc > 2*invalid_psc + 6){
-        return 50;
+        return AVPROBE_SCORE_EXTENSION;
     }else if(valid_psc > 2*invalid_psc + 2)
-        return 25;
+        return AVPROBE_SCORE_EXTENSION / 2;
     return 0;
 }
 
diff --git a/libavformat/h263dec.c b/libavformat/h263dec.c
index 101ef51748..4d826d8c2d 100644
--- a/libavformat/h263dec.c
+++ b/libavformat/h263dec.c
@@ -56,9 +56,9 @@ static int h263_probe(AVProbeData *p)
         }
     }
     if(valid_psc > 2*invalid_psc + 2*res_change + 3){
-        return 50;
+        return AVPROBE_SCORE_EXTENSION;
     }else if(valid_psc > 2*invalid_psc)
-        return 25;
+        return AVPROBE_SCORE_EXTENSION / 2;
     return 0;
 }
 
diff --git a/libavformat/h264dec.c b/libavformat/h264dec.c
index 0c85bae6d4..7d3bb474f4 100644
--- a/libavformat/h264dec.c
+++ b/libavformat/h264dec.c
@@ -63,7 +63,7 @@ static int h264_probe(AVProbeData *p)
         }
     }
     if(sps && pps && (idr||sli>3) && res<(sps+pps+idr))
-        return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
+        return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
     return 0;
 }
 
diff --git a/libavformat/idcin.c b/libavformat/idcin.c
index fa9976bae6..2536e8bd62 100644
--- a/libavformat/idcin.c
+++ b/libavformat/idcin.c
@@ -137,7 +137,7 @@ static int idcin_probe(AVProbeData *p)
         return 0;
 
     /* return half certainty since this check is a bit sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int idcin_read_header(AVFormatContext *s)
diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 1d437f5b4d..9acb6f6927 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -130,7 +130,7 @@ static int img_read_probe(AVProbeData *p)
         if (av_filename_number_test(p->filename))
             return AVPROBE_SCORE_MAX;
         else
-            return AVPROBE_SCORE_MAX / 2;
+            return AVPROBE_SCORE_EXTENSION;
     }
     return 0;
 }
diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c
index 4bee058a50..04bd0621bc 100644
--- a/libavformat/m4vdec.c
+++ b/libavformat/m4vdec.c
@@ -45,7 +45,7 @@ static int mpeg4video_probe(AVProbeData *probe_packet)
     }
 
     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
-        return AVPROBE_SCORE_MAX/2;
+        return AVPROBE_SCORE_EXTENSION;
     return 0;
 }
 
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 5279110312..744f7c0f6c 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -962,7 +962,7 @@ static int matroska_probe(AVProbeData *p)
     }
 
     // probably valid EBML header but no recognized doctype
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
diff --git a/libavformat/mm.c b/libavformat/mm.c
index 83539fa242..8c9cbd79d2 100644
--- a/libavformat/mm.c
+++ b/libavformat/mm.c
@@ -79,7 +79,7 @@ static int probe(AVProbeData *p)
         return 0;
 
     /* only return half certainty since this check is a bit sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int read_header(AVFormatContext *s)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 291c14227c..849ade0b2d 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2639,7 +2639,7 @@ static int mov_probe(AVProbeData *p)
         case MKTAG('p','r','f','l'):
             offset = AV_RB32(p->buf+offset) + offset;
             /* if we only find those cause probedata is too small at least rate them */
-            score = AVPROBE_SCORE_MAX - 50;
+            score = AVPROBE_SCORE_EXTENSION;
             break;
         default:
             /* unrecognized tag */
diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
index 9da9aa8b16..14edc4ae8e 100644
--- a/libavformat/mp3dec.c
+++ b/libavformat/mp3dec.c
@@ -73,7 +73,7 @@ static int mp3_read_probe(AVProbeData *p)
     }
     // keep this in sync with ac3 probe, both need to avoid
     // issues with MPEG-files!
-    if (first_frames >= 4) return AVPROBE_SCORE_MAX / 2 + 1;
+    if (first_frames >= 4) return AVPROBE_SCORE_EXTENSION + 1;
 
     if (max_frames) {
         int pes = 0, i;
@@ -94,8 +94,8 @@ static int mp3_read_probe(AVProbeData *p)
         if (pes)
             max_frames = (max_frames + pes - 1) / pes;
     }
-    if      (max_frames >  500) return AVPROBE_SCORE_MAX / 2;
-    else if (max_frames >= 4)   return AVPROBE_SCORE_MAX / 4;
+    if      (max_frames >  500) return AVPROBE_SCORE_EXTENSION;
+    else if (max_frames >= 4)   return AVPROBE_SCORE_EXTENSION / 2;
     else if (max_frames >= 1)   return 1;
     else                        return 0;
 //mpegps_mp3_unrecognized_format.mpg has max_frames=3
diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index f60a314b77..c3c70e051e 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -92,7 +92,7 @@ static int mpc8_probe(AVProbeData *p)
         if (size < 2)
             return 0;
         if (bs + size - 2 >= bs_end)
-            return AVPROBE_SCORE_MAX / 4 - 1; //seems to be valid MPC but no header yet
+            return AVPROBE_SCORE_EXTENSION - 1; // seems to be valid MPC but no header yet
         if (header_found) {
             if (size < 11 || size > 28)
                 return 0;
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 2d08b17682..8a4c6d7acc 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -82,14 +82,14 @@ static int mpegps_probe(AVProbeData *p)
     }
 
     if(vid+audio > invalid)     /* invalid VDR files nd short PES streams */
-        score= AVPROBE_SCORE_MAX/4;
+        score = AVPROBE_SCORE_EXTENSION / 2;
 
     if(sys>invalid && sys*9 <= pspack*10)
-        return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+        return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
     if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
-        return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+        return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
     if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
-        return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
+        return (audio > 12 || vid > 3) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2;
 
     //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
     //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
diff --git a/libavformat/mpegvideodec.c b/libavformat/mpegvideodec.c
index 87e5e038c6..96b95a58f1 100644
--- a/libavformat/mpegvideodec.c
+++ b/libavformat/mpegvideodec.c
@@ -51,7 +51,7 @@ static int mpegvideo_probe(AVProbeData *p)
         }
     }
     if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)
-        return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
+        return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
     return 0;
 }
 
diff --git a/libavformat/mtv.c b/libavformat/mtv.c
index 3c2ae1f56d..ed250bccc3 100644
--- a/libavformat/mtv.c
+++ b/libavformat/mtv.c
@@ -64,13 +64,13 @@ static int mtv_probe(AVProbeData *p)
     if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54]))
     {
         if(!!AV_RL16(&p->buf[56]))
-            return AVPROBE_SCORE_MAX/2;
+            return AVPROBE_SCORE_EXTENSION;
         else
             return 0;
     }
 
     if(p->buf[51] != 16)
-        return AVPROBE_SCORE_MAX/4; // But we are going to assume 16bpp anyway ..
+        return AVPROBE_SCORE_EXTENSION / 2; // But we are going to assume 16bpp anyway ..
 
     return AVPROBE_SCORE_MAX;
 }
diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index 7698f55bb1..ffe43cf335 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -791,7 +791,7 @@ static int nsv_probe(AVProbeData *p)
     }
     /* so we'll have more luck on extension... */
     if (av_match_ext(p->filename, "nsv"))
-        return AVPROBE_SCORE_MAX/2;
+        return AVPROBE_SCORE_EXTENSION;
     /* FIXME: add mime-type check */
     return score;
 }
diff --git a/libavformat/omadec.c b/libavformat/omadec.c
index b932ec33d0..4f9c49f611 100644
--- a/libavformat/omadec.c
+++ b/libavformat/omadec.c
@@ -428,7 +428,7 @@ static int oma_read_probe(AVProbeData *p)
     /* This check cannot overflow as tag_len has at most 28 bits */
     if (p->buf_size < tag_len + 5)
         /* EA3 header comes late, might be outside of the probe buffer */
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
 
     buf += tag_len;
 
diff --git a/libavformat/psxstr.c b/libavformat/psxstr.c
index 313a1d8fe7..712dbc9b92 100644
--- a/libavformat/psxstr.c
+++ b/libavformat/psxstr.c
@@ -94,7 +94,7 @@ static int str_probe(AVProbeData *p)
 
     /* MPEG files (like those ripped from VCDs) can also look like this;
      * only return half certainty */
-    return 50;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int str_read_header(AVFormatContext *s)
diff --git a/libavformat/pva.c b/libavformat/pva.c
index 53041ba494..3abfc18508 100644
--- a/libavformat/pva.c
+++ b/libavformat/pva.c
@@ -36,7 +36,7 @@ static int pva_probe(AVProbeData * pd) {
     unsigned char *buf = pd->buf;
 
     if (AV_RB16(buf) == PVA_MAGIC && buf[2] && buf[2] < 3 && buf[4] == 0x55)
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
 
     return 0;
 }
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index a5e2f050ce..3351c34a58 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -2032,7 +2032,7 @@ static int sdp_probe(AVProbeData *p1)
     while (p < p_end && *p != '\0') {
         if (p + sizeof("c=IN IP") - 1 < p_end &&
             av_strstart(p, "c=IN IP", NULL))
-            return AVPROBE_SCORE_MAX / 2;
+            return AVPROBE_SCORE_EXTENSION;
 
         while (p < p_end - 1 && *p != '\n') p++;
         if (++p >= p_end)
diff --git a/libavformat/sierravmd.c b/libavformat/sierravmd.c
index 359282c875..645b99bf97 100644
--- a/libavformat/sierravmd.c
+++ b/libavformat/sierravmd.c
@@ -76,7 +76,7 @@ static int vmd_probe(AVProbeData *p)
         return 0;
 
     /* only return half certainty since this check is a bit sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int vmd_read_header(AVFormatContext *s)
diff --git a/libavformat/spdifdec.c b/libavformat/spdifdec.c
index e5202494f5..2fb94773a5 100644
--- a/libavformat/spdifdec.c
+++ b/libavformat/spdifdec.c
@@ -149,10 +149,10 @@ static int spdif_probe(AVProbeData *p)
 
     if (sync_codes >= 6)
         /* good amount of sync codes but with unexpected offsets */
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
 
     /* some sync codes were found */
-    return AVPROBE_SCORE_MAX / 8;
+    return AVPROBE_SCORE_EXTENSION / 4;
 }
 
 static int spdif_read_header(AVFormatContext *s)
diff --git a/libavformat/takdec.c b/libavformat/takdec.c
index 13bc49b6b7..584cbccb50 100644
--- a/libavformat/takdec.c
+++ b/libavformat/takdec.c
@@ -33,7 +33,7 @@ typedef struct TAKDemuxContext {
 static int tak_probe(AVProbeData *p)
 {
     if (!memcmp(p->buf, "tBaK", 4))
-        return AVPROBE_SCORE_MAX / 2;
+        return AVPROBE_SCORE_EXTENSION;
     return 0;
 }
 
diff --git a/libavformat/tta.c b/libavformat/tta.c
index 9d3d295aba..e5e6e7186c 100644
--- a/libavformat/tta.c
+++ b/libavformat/tta.c
@@ -36,7 +36,7 @@ static int tta_probe(AVProbeData *p)
     const uint8_t *d = p->buf;
 
     if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
-        return 80;
+        return AVPROBE_SCORE_EXTENSION + 30;
     return 0;
 }
 
diff --git a/libavformat/utils.c b/libavformat/utils.c
index e1acb254b6..75dc3631e2 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -309,7 +309,7 @@ AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score
             score = fmt1->read_probe(&lpd);
         } else if (fmt1->extensions) {
             if (av_match_ext(lpd.filename, fmt1->extensions)) {
-                score = 50;
+                score = AVPROBE_SCORE_EXTENSION;
             }
         }
         if (score > *score_max) {
@@ -320,18 +320,18 @@ AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score
     }
 
     /* a hack for files with huge id3v2 tags -- try to guess by file extension. */
-    if (!fmt && is_opened && *score_max < AVPROBE_SCORE_MAX/4) {
+    if (!fmt && is_opened && *score_max < AVPROBE_SCORE_EXTENSION / 2) {
         while ((fmt = av_iformat_next(fmt)))
             if (fmt->extensions && av_match_ext(lpd.filename, fmt->extensions)) {
-                *score_max = AVPROBE_SCORE_MAX/4;
+                *score_max = AVPROBE_SCORE_EXTENSION / 2;
                 break;
             }
     }
 
-    if (!fmt && id3 && *score_max < AVPROBE_SCORE_MAX/4-1) {
+    if (!fmt && id3 && *score_max < AVPROBE_SCORE_EXTENSION / 2 - 1) {
         while ((fmt = av_iformat_next(fmt)))
             if (fmt->extensions && av_match_ext("mp3", fmt->extensions)) {
-                *score_max = AVPROBE_SCORE_MAX/4-1;
+                *score_max = AVPROBE_SCORE_EXTENSION / 2 - 1;
                 break;
             }
     }
diff --git a/libavformat/vc1test.c b/libavformat/vc1test.c
index 1895fc4153..859188f372 100644
--- a/libavformat/vc1test.c
+++ b/libavformat/vc1test.c
@@ -39,7 +39,7 @@ static int vc1t_probe(AVProbeData *p)
     if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
         return 0;
 
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int vc1t_read_header(AVFormatContext *s)
diff --git a/libavformat/vqf.c b/libavformat/vqf.c
index 66ced37bad..ab1042aa29 100644
--- a/libavformat/vqf.c
+++ b/libavformat/vqf.c
@@ -43,7 +43,7 @@ static int vqf_probe(AVProbeData *probe_packet)
     if (!memcmp(probe_packet->buf + 4, "00052200", 8))
         return AVPROBE_SCORE_MAX;
 
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static void add_metadata(AVFormatContext *s, uint32_t tag,
diff --git a/libavformat/westwood_aud.c b/libavformat/westwood_aud.c
index c3f8e6e34d..611d223238 100644
--- a/libavformat/westwood_aud.c
+++ b/libavformat/westwood_aud.c
@@ -79,7 +79,7 @@ static int wsaud_probe(AVProbeData *p)
         return 0;
 
     /* return 1/2 certainty since this file check is a little sketchy */
-    return AVPROBE_SCORE_MAX / 2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int wsaud_read_header(AVFormatContext *s)
diff --git a/libavformat/xa.c b/libavformat/xa.c
index 02d66c5364..57a36bcbe2 100644
--- a/libavformat/xa.c
+++ b/libavformat/xa.c
@@ -59,7 +59,7 @@ static int xa_probe(AVProbeData *p)
     if (!channels || channels > 8 || !srate || srate > 192000 ||
         bits_per_sample < 4 || bits_per_sample > 32)
         return 0;
-    return AVPROBE_SCORE_MAX/2;
+    return AVPROBE_SCORE_EXTENSION;
 }
 
 static int xa_read_header(AVFormatContext *s)