@@ -55,9 +55,9 @@ 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;

 }

@@ -79,9 +79,9 @@ 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;

-    else if(max_frames>200)return AVPROBE_SCORE_MAX/2;

-    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;

+    if   (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;

+    else if(max_frames>200)return AVPROBE_SCORE_EXTENSION;

+    else if(max_frames>=4) return AVPROBE_SCORE_EXTENSION/2;

     else if(max_frames>=1) return 1;

     else                   return 0;

 }

@@ -337,8 +337,10 @@ 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_RETRY (AVPROBE_SCORE_MAX/4)

+#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.

@@ -830,7 +830,7 @@ static int avi_read_header(AVFormatContext *s)

 static int read_gab2_sub(AVStream *st, AVPacket *pkt) {

     if (pkt->data && !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;

@@ -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 55;

+        return AVPROBE_SCORE_EXTENSION+5;

     return 0;

 }

@@ -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;

 }

@@ -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;

 }

@@ -280,7 +280,7 @@ 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 = {

@@ -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;

 }

@@ -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;

 }

@@ -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;

 }

@@ -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)

@@ -185,7 +185,7 @@ static int img_read_probe(AVProbeData *p)

         else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))

             return 5;

         else

-            return AVPROBE_SCORE_MAX / 2;

+            return AVPROBE_SCORE_EXTENSION;

     }

     return 0;

 }

@@ -45,7 +45,7 @@ static int mpeg4video_probe(AVProbeData *probe_packet)

     }

     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)

-        return VOP+VO > 3 ? AVPROBE_SCORE_MAX/2 : AVPROBE_SCORE_MAX/4;

+        return VOP+VO > 3 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;

     return 0;

 }

@@ -1060,7 +1060,7 @@ 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,

@@ -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)

@@ -2887,7 +2887,7 @@ static int mov_probe(AVProbeData *p)

                 (AV_RB32(p->buf+offset) != 1 ||

                  offset + 12 > (unsigned int)p->buf_size ||

                  AV_RB64(p->buf+offset + 8) == 0)) {

-                score = FFMAX(score, AVPROBE_SCORE_MAX - 50);

+                score = FFMAX(score, AVPROBE_SCORE_EXTENSION);

             } else {

                 score = AVPROBE_SCORE_MAX;

             }

@@ -2907,7 +2907,7 @@ static int mov_probe(AVProbeData *p)

         case MKTAG('u','u','i','d'):

         case MKTAG('p','r','f','l'):

             /* if we only find those cause probedata is too small at least rate them */

-            score  = FFMAX(score, AVPROBE_SCORE_MAX - 50);

+            score  = FFMAX(score, AVPROBE_SCORE_EXTENSION);

             offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;

             break;

         default:

@@ -76,11 +76,11 @@ 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;

-    else if(max_frames>200)return AVPROBE_SCORE_MAX/2;

-    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;

+    if   (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;

+    else if(max_frames>200)return AVPROBE_SCORE_EXTENSION;

+    else if(max_frames>=4) return AVPROBE_SCORE_EXTENSION / 2;

     else if(ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC) && 2*ff_id3v2_tag_len(buf0) >= p->buf_size)

-                           return AVPROBE_SCORE_MAX/8;

+                           return AVPROBE_SCORE_EXTENSION / 4;

     else if(max_frames>=1) return 1;

     else                   return 0;

 //mpegps_mp3_unrecognized_format.mpg has max_frames=3

@@ -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;

@@ -89,14 +89,14 @@ static int mpegps_probe(AVProbeData *p)

     }

     if(vid+audio > invalid+1)     /* 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 (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg

+        return (audio > 12 || vid > 3 || 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 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;

+        return (audio > 12 || vid > 3 + 2*invalid) ? 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

@@ -63,8 +63,8 @@ static int mpegvideo_probe(AVProbeData *p)

         }

     }

     if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) {

-        if(vpes) return AVPROBE_SCORE_MAX/8;

-        else     return pic>1 ? AVPROBE_SCORE_MAX/2+1 : AVPROBE_SCORE_MAX/4; // +1 for .mpg

+        if(vpes) return AVPROBE_SCORE_EXTENSION / 4;

+        else     return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // +1 for .mpg

     }

     return 0;

 }

@@ -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;

 }

@@ -786,7 +786,7 @@ 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;

 }

@@ -433,7 +433,7 @@ 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;

@@ -126,7 +126,7 @@ static int str_probe(AVProbeData *p)

     }

     /* MPEG files (like those ripped from VCDs) can also look like this;

      * only return half certainty */

-    if(vid+aud > 3)  return 50;

+    if(vid+aud > 3)  return AVPROBE_SCORE_EXTENSION;

     else if(vid+aud) return 1;

     else             return 0;

 }

@@ -49,7 +49,7 @@ static int pva_probe(AVProbeData * pd) {

     if (pd->buf_size >= len + 8 &&

         pva_check(buf + len) >= 0)

-        return AVPROBE_SCORE_MAX / 2;

+        return AVPROBE_SCORE_EXTENSION;

     return AVPROBE_SCORE_MAX / 4;

 }

@@ -2030,7 +2030,7 @@ 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)

@@ -77,7 +77,7 @@ 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)

@@ -154,10 +154,10 @@ int ff_spdif_probe(const uint8_t *p_buf, int buf_size, enum AVCodecID *codec)

     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)

@@ -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;

 }

@@ -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;

 }

@@ -376,10 +376,10 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score

         if (fmt1->read_probe) {

             score = fmt1->read_probe(&lpd);

             if(fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions))

-                score = FFMAX(score, nodat ? AVPROBE_SCORE_MAX/4-1 : 1);

+                score = FFMAX(score, nodat ? AVPROBE_SCORE_EXTENSION / 2 - 1 : 1);

         } else if (fmt1->extensions) {

             if (av_match_ext(lpd.filename, fmt1->extensions)) {

-                score = 50;

+                score = AVPROBE_SCORE_EXTENSION;

             }

         }

         if (score > score_max) {

@@ -389,7 +389,7 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score

             fmt = NULL;

     }

     if(nodat)

-        score_max = FFMIN(AVPROBE_SCORE_MAX/4-1, score_max);

+        score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max);

     *score_ret= score_max;

     return fmt;

@@ -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)

@@ -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,

@@ -77,7 +77,7 @@ 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)

@@ -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)