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mxf: Correctly support files from Pinnacle Thunder

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Such files have IndexTableSegments which when parsed cover EditUnit
ranges like this:

 [0,1)
 [249,250)
 [249,377)
 [0,249)

where each interval is

 [IndexStartPosition, IndexStartPosition + IndexDuration)

This would be reduced to a sparse index like:

 [0,1), [249,250)

instead of the full range:

 [0,249), [249,377)

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Tomas Härdin 2012-04-04 14:24:49 +02:00 committed by Luca Barbato
parent 0d6605c7ef
commit 8b708f1c6b
1 changed files with 5 additions and 1 deletions
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6
libavformat/mxfdec.c
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@ -971,19 +971,23 @@ static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segment
/* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */
for (i = 0; i < nb_segments; i++) {
int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;
uint64_t best_index_duration = 0;
for (j = 0; j < nb_segments; j++) {
MXFIndexTableSegment *s = unsorted_segments[j];
/* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.
* We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.
* If we come across an entry with the same IndexStartPosition but larger IndexDuration, then we'll prefer it over the one we currently have.
*/
if ((i == 0 || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&
(best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {
(best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start ||
(s->index_start_position == best_index_start && s->index_duration > best_index_duration))) {
best = j;
best_body_sid = s->body_sid;
best_index_sid = s->index_sid;
best_index_start = s->index_start_position;
best_index_duration = s->index_duration;
}
}