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avformat/mxfdec: optimize probing

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about 71 times faster

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-08 21:43:27 +01:00
parent 6b4f58d448
commit a26e83da6c
1 changed files with 13 additions and 3 deletions
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16
libavformat/mxfdec.c
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@ -47,6 +47,7 @@
#include "libavutil/avassert.h"
#include "libavutil/mathematics.h"
#include "libavcodec/bytestream.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/timecode.h"
#include "avformat.h"
#include "internal.h"
@ -2456,10 +2457,19 @@ static int mxf_probe(AVProbeData *p) {
/* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
end -= sizeof(mxf_header_partition_pack_key);
for (; bufp < end; bufp++) {
if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
return AVPROBE_SCORE_MAX;
for (; bufp < end;) {
if (!((bufp[13] - 1) & 0xF2)){
if (AV_RN32(bufp ) == AV_RN32(mxf_header_partition_pack_key ) &&
AV_RN32(bufp+ 4) == AV_RN32(mxf_header_partition_pack_key+ 4) &&
AV_RN32(bufp+ 8) == AV_RN32(mxf_header_partition_pack_key+ 8) &&
AV_RN16(bufp+12) == AV_RN16(mxf_header_partition_pack_key+12))
return AVPROBE_SCORE_MAX;
bufp ++;
} else
bufp += 10;
}
return 0;
}