avformat/mxfdec: export operational pattern UL as file metadata

Can be useful for API users as ffmpeg/libavformat can't properly support some
operational patterns.
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/mxfdec.c

@@ -654,6 +654,7 @@ static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, U
 static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
 {
     MXFContext *mxf = arg;
+    AVFormatContext *s = mxf->fc;
     MXFPartition *partition, *tmp_part;
     UID op;
     uint64_t footer_partition;
@@ -718,6 +719,12 @@ static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size
     }
     nb_essence_containers = avio_rb32(pb);
 
+    if (partition->type == Header) {
+        char str[36];
+        snprintf(str, sizeof(str), "%08x.%08x.%08x.%08x", AV_RB32(&op[0]), AV_RB32(&op[4]), AV_RB32(&op[8]), AV_RB32(&op[12]));
+        av_dict_set(&s->metadata, "operational_pattern", str, 0);
+    }
+
     if (partition->this_partition &&
         partition->previous_partition == partition->this_partition) {
         av_log(mxf->fc, AV_LOG_ERROR,

tests/ref/fate/mxf-probe-d10

@@ -96,6 +96,7 @@ TAG:file_package_umid=0x060A2B340101010501010D1313000000AE86B2009131058000000800
 format_name=mxf
 duration=0.178375
 bit_rate=56419744
+TAG:operational_pattern=060e2b34.04010101.0d010201.01010900
 TAG:uid=0086b200-9131-0580-0000-080046a54011
 TAG:generation_uid=b486b200-9131-0580-0000-080046a54011
 TAG:company_name=SONY

tests/ref/fate/mxf-probe-dnxhd

@@ -167,6 +167,7 @@ TAG:timecode=01:00:00:00
 format_name=mxf
 duration=0.250250
 bit_rate=25340195
+TAG:operational_pattern=060e2b34.04010102.0d010201.10030000
 TAG:project_name=UHD
 TAG:uid=784c8132-ae36-ed4d-b0ff-2edf1f3f2d92
 TAG:generation_uid=b6bcfcab-70ff-7331-c47c-478869de11d2

tests/ref/fate/mxf-probe-dv25

@@ -137,6 +137,7 @@ TAG:file_package_umid=0x060A2B340101010501010D4313000000F2E2FCE98722F14F947F08DE
 format_name=mxf
 duration=1.000000
 bit_rate=30679040
+TAG:operational_pattern=060e2b34.04010101.0d010201.01010900
 TAG:uid=a741d0c7-244a-bc4a-bd36-3323d04f8954
 TAG:generation_uid=c1d7a0ee-89d6-754d-bd52-cdf42b53de9f
 TAG:company_name=AVID