[FFmpeg-cvslog] avformat/nutdec: improve probe speed by 30%

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue Jun 24 18:32:14 2014 +0200| [74bd039f8cc2edfd869d3feb75be9525b92a431f] | committer: Michael Niedermayer

avformat/nutdec: improve probe speed by 30%

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=74bd039f8cc2edfd869d3feb75be9525b92a431f
---

 libavformat/nutdec.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
index 7da6f2c..093ae63 100644
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@@ -183,11 +183,11 @@ static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
 static int nut_probe(AVProbeData *p)
 {
     int i;
-    uint64_t code = 0;
 
-    for (i = 0; i < p->buf_size; i++) {
-        code = (code << 8) | p->buf[i];
-        if (code == MAIN_STARTCODE)
+    for (i = 0; i < p->buf_size-8; i++) {
+        if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
+            continue;
+        if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
             return AVPROBE_SCORE_MAX;
     }
     return 0;