Added support for reading Start Timecode from Footer (if any).
Specifically targets Omneon 6.4.3.0 but also works on other Versions and
Vendors, e.g. when Header is OpenIncomplete.
Function mxf_resolve_strong_ref_reverse can potentially be re-used for getting
other values like Duration and
Origin from Footer.
---
libavformat/mxfdec.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index 3bf480a3a6..557e01f8ed 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -1396,6 +1396,19 @@ static const MXFCodecUL *mxf_get_codec_ul(const
MXFCodecUL *uls, UID *uid)
return uls;
}
+static void *mxf_resolve_strong_ref_reverse(MXFContext *mxf, UID *strong_ref,
enum MXFMetadataSetType type)
+{
+ int i;
+ if (!strong_ref)
+ return NULL;
+ for (i = mxf->metadata_sets_count-1; i >= 0 ; i--) {
+ if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
+ (type == AnyType || mxf->metadata_sets[i]->type == type)) {
+ return mxf->metadata_sets[i];
+ }
+ }
+ return NULL;
+}
static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum
MXFMetadataSetType type)
{
int i;
@@ -2328,8 +2341,15 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
continue;
mxf_tc = (MXFTimecodeComponent*)component;
+ if (mxf_tc->start_frame <= 0) {
+ av_log(mxf->fc, AV_LOG_TRACE, "Header Start Timecode was
%d, trying reversed parsing\n",mxf_tc->start_frame);
+ component = mxf_resolve_strong_ref_reverse(mxf,
&material_track->sequence->structural_components_refs[j], TimecodeComponent);
+ mxf_tc = (MXFTimecodeComponent*)component;
+ }
+
flags = mxf_tc->drop_frame == 1 ? AV_TIMECODE_FLAG_DROPFRAME : 0;
if (av_timecode_init(&tc, mxf_tc->rate, flags,
mxf_tc->start_frame, mxf->fc) == 0) {
+ av_log(mxf->fc, AV_LOG_TRACE, "Setting Start Timecode: %d
\n",mxf_tc->start_frame);
mxf_add_timecode_metadata(&mxf->fc->metadata, "timecode", &tc);
break;
}
--
2.25.1
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