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avformat/mxfdec: use binary search in mxf_absolute_bodysid_offset 

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2018-02-19 00:43:05 +01:00
parent 3aaf97e773
commit 90756e67a0
1 changed files with 14 additions and 8 deletions
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22
libavformat/mxfdec.c
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@ -1347,24 +1347,30 @@ static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segment
*/
static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)
{
int x;
MXFPartition *last_p = NULL;
int a, b, m, m0;
if (offset < 0)
return AVERROR(EINVAL);
for (x = 0; x < mxf->partitions_count; x++) {
MXFPartition *p = &mxf->partitions[x];
a = -1;
b = mxf->partitions_count;
if (p->body_sid != body_sid)
continue;
while (b - a > 1) {
m0 = m = (a + b) >> 1;
if (p->body_offset > offset)
break;
while (m < b && mxf->partitions[m].body_sid != body_sid)
m++;
last_p = p;
if (m < b && mxf->partitions[m].body_offset <= offset)
a = m;
else
b = m0;
}
if (a >= 0)
last_p = &mxf->partitions[a];
if (last_p && (!last_p->essence_length || last_p->essence_length > (offset - last_p->body_offset))) {
*offset_out = last_p->essence_offset + (offset - last_p->body_offset);
return 0;