mxf: Start implementing a central UL database and add some helper functions and use them

6 files changed, 394 insertions, 208 deletions

diff --git a/gst/mxf/Makefile.am b/gst/mxf/Makefile.am
index c5eef4b6..617ab685 100644
--- a/gst/mxf/Makefile.am
+++ b/gst/mxf/Makefile.am
@@ -16,7 +16,8 @@ libgstmxf_la_SOURCES = \
 	mxfmetadata.c \
 	mxfdms1.c \
 	mxfwrite.c \
-	mxfmux.c
+	mxfmux.c \
+	mxful.c
 
 libgstmxf_la_CFLAGS = $(GST_CFLAGS) $(GST_BASE_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS)
 libgstmxf_la_LIBADD = $(GST_LIBS) $(GST_BASE_LIBS) $(GST_PLUGINS_BASE_LIBS) \
@@ -39,5 +40,6 @@ noinst_HEADERS = \
 	mxfmetadata.h \
 	mxfdms1.h \
 	mxfwrite.h \
-	mxfmux.h
+	mxfmux.h \
+	mxful.h
 
diff --git a/gst/mxf/mxfparse.c b/gst/mxf/mxfparse.c
index 71d639e4..7d51241d 100644
--- a/gst/mxf/mxfparse.c
+++ b/gst/mxf/mxfparse.c
@@ -33,57 +33,20 @@ GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
 static const MXFTimestamp mxf_timestamp_unknown = { 0, 0, 0, 0, 0, 0, 0 };
 
 static const MXFUMID umid_zero = { {0,} };
-static const MXFUL key_zero = { {0,} };
-
-/* UL common to all MXF UL */
-static const guint8 mxf_key[] = { 0x06, 0x0e, 0x2b, 0x34 };
-
-/* SMPTE 377M 6.1 */
-static const guint8 partition_pack_key[] =
-    { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01, 0x0d, 0x01, 0x02, 0x01,
-  0x01
-};
-
-/* SMPTE 336M */
-static const guint8 fill_key[] =
-    { 0x06, 0x0e, 0x2b, 0x34, 0x01, 0x01, 0x01, 0x01, 0x03, 0x01, 0x02, 0x10,
-  0x01, 0x00, 0x00, 0x00
-};
-
-/* SMPTE 377M 8.1 */
-static const guint8 primer_pack_key[] =
-    { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01, 0x0d, 0x01, 0x02, 0x01,
-  0x01, 0x05, 0x01, 0x00
-};
-
-/* SMPTE 377M 8.6 */
-static const guint8 metadata_key[] =
-    { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x01, 0x01,
-  0x01
-};
-
-static const guint8 random_index_pack_key[] =
-    { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01, 0x0d, 0x01, 0x02, 0x01,
-  0x01, 0x11, 0x01, 0x00
-};
-
-static const guint8 index_table_segment_key[] =
-    { 0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01, 0x0d, 0x01, 0x02, 0x01,
-  0x01, 0x10, 0x01, 0x00
-};
 
 gboolean
-mxf_is_mxf_packet (const MXFUL * key)
+mxf_is_mxf_packet (const MXFUL * ul)
 {
-  return (memcmp (key, mxf_key, 4) == 0);
+  return mxf_ul_is_subclass (MXF_UL (SMPTE), ul);
 }
 
 /* SMPTE 377M 6.1: Check if this is a valid partition pack */
 gboolean
-mxf_is_partition_pack (const MXFUL * key)
+mxf_is_partition_pack (const MXFUL * ul)
 {
-  if (memcmp (key, partition_pack_key, 13) == 0 && key->u[13] >= 0x02
-      && key->u[13] <= 0x04 && key->u[14] < 0x05 && key->u[15] == 0x00)
+  if (mxf_ul_is_subclass (MXF_UL (PARTITION_PACK), ul) &&
+      ul->u[13] >= 0x02 && ul->u[13] <= 0x04 &&
+      ul->u[14] < 0x05 && ul->u[15] == 0x00)
     return TRUE;
 
   return FALSE;
@@ -91,10 +54,9 @@ mxf_is_partition_pack (const MXFUL * key)
 
 /* SMPTE 377M 6.2: header partition pack has byte 14 == 0x02 */
 gboolean
-mxf_is_header_partition_pack (const MXFUL * key)
+mxf_is_header_partition_pack (const MXFUL * ul)
 {
-  if (memcmp (key, partition_pack_key, 13) == 0 && key->u[13] == 0x02 &&
-      key->u[14] < 0x05 && key->u[15] == 0x00)
+  if (mxf_is_partition_pack (ul) && ul->u[13] == 0x02)
     return TRUE;
 
   return FALSE;
@@ -102,10 +64,9 @@ mxf_is_header_partition_pack (const MXFUL * key)
 
 /* SMPTE 377M 6.3: body partition pack has byte 14 == 0x03 */
 gboolean
-mxf_is_body_partition_pack (const MXFUL * key)
+mxf_is_body_partition_pack (const MXFUL * ul)
 {
-  if (memcmp (key, partition_pack_key, 13) == 0 && key->u[13] == 0x03 &&
-      key->u[14] < 0x05 && key->u[15] == 0x00)
+  if (mxf_is_partition_pack (ul) && ul->u[13] == 0x03)
     return TRUE;
 
   return FALSE;
@@ -113,159 +74,92 @@ mxf_is_body_partition_pack (const MXFUL * key)
 
 /* SMPTE 377M 6.4: footer partition pack has byte 14 == 0x04 */
 gboolean
-mxf_is_footer_partition_pack (const MXFUL * key)
+mxf_is_footer_partition_pack (const MXFUL * ul)
 {
-  if (memcmp (key, partition_pack_key, 13) == 0 && key->u[13] == 0x04 &&
-      key->u[14] < 0x05 && key->u[15] == 0x00)
+  if (mxf_is_partition_pack (ul) && ul->u[13] == 0x04)
     return TRUE;
 
   return FALSE;
 }
 
 gboolean
-mxf_is_fill (const MXFUL * key)
+mxf_is_fill (const MXFUL * ul)
 {
-  return (memcmp (key, fill_key, 16) == 0);
+  return (mxf_ul_is_subclass (MXF_UL (FILL), ul));
 }
 
 gboolean
-mxf_is_primer_pack (const MXFUL * key)
+mxf_is_primer_pack (const MXFUL * ul)
 {
-  return (memcmp (key, primer_pack_key, 16) == 0);
+  return (mxf_ul_is_subclass (MXF_UL (PRIMER_PACK), ul));
 }
 
 gboolean
-mxf_is_metadata (const MXFUL * key)
+mxf_is_metadata (const MXFUL * ul)
 {
-  return (memcmp (key, metadata_key, 13) == 0 && key->u[15] == 0x00);
+  return (mxf_ul_is_subclass (MXF_UL (METADATA), ul));
 }
 
 /* SMPTE 377M 8.7.3 */
 gboolean
-mxf_is_descriptive_metadata (const MXFUL * key)
+mxf_is_descriptive_metadata (const MXFUL * ul)
 {
-  return (memcmp (key, mxf_key, 4) == 0 &&
-      key->u[4] == 0x02 &&
-      key->u[6] == 0x01 &&
-      key->u[7] == 0x01 &&
-      key->u[8] == 0x0d &&
-      key->u[9] == 0x01 && key->u[10] == 0x04 && key->u[11] == 0x01);
+  return (mxf_ul_is_subclass (MXF_UL (DESCRIPTIVE_METADATA), ul));
 }
 
 gboolean
-mxf_is_random_index_pack (const MXFUL * key)
+mxf_is_random_index_pack (const MXFUL * ul)
 {
-  return (memcmp (key, random_index_pack_key, 16) == 0);
+  return (mxf_ul_is_subclass (MXF_UL (RANDOM_INDEX_PACK), ul));
 }
 
 gboolean
-mxf_is_index_table_segment (const MXFUL * key)
+mxf_is_index_table_segment (const MXFUL * ul)
 {
-  return (memcmp (key, index_table_segment_key, 16) == 0);
+  return (mxf_ul_is_subclass (MXF_UL (INDEX_TABLE_SEGMENT), ul));
 }
 
 /* SMPTE 379M 6.2.1 */
 gboolean
-mxf_is_generic_container_system_item (const MXFUL * key)
+mxf_is_generic_container_system_item (const MXFUL * ul)
 {
-  return (memcmp (key, mxf_key, 4) == 0 && key->u[4] == 0x02
-      && key->u[6] == 0x01 && key->u[8] == 0x0d && key->u[9] == 0x01
-      && key->u[10] == 0x03 && key->u[11] == 0x01 && (key->u[12] == 0x04
-          || key->u[12] == 0x14));
+  return (mxf_ul_is_subclass (MXF_UL (GENERIC_CONTAINER_SYSTEM_ITEM), ul) &&
+      (ul->u[12] == 0x04 || ul->u[12] == 0x14));
 }
 
 /* SMPTE 379M 7.1 */
 gboolean
-mxf_is_generic_container_essence_element (const MXFUL * key)
+mxf_is_generic_container_essence_element (const MXFUL * ul)
 {
-  return (memcmp (key, mxf_key, 4) == 0 && key->u[4] == 0x01
-      && key->u[5] == 0x02 && key->u[6] == 0x01 && key->u[8] == 0x0d
-      && key->u[9] == 0x01 && key->u[10] == 0x03 && key->u[11] == 0x01
-      && (key->u[12] == 0x05 || key->u[12] == 0x06 || key->u[12] == 0x07
-          || key->u[12] == 0x15 || key->u[12] == 0x16 || key->u[12] == 0x17
-          || key->u[12] == 0x18));
+  return (mxf_ul_is_subclass (MXF_UL (GENERIC_CONTAINER_ESSENCE_ELEMENT), ul)
+      && (ul->u[12] == 0x05 || ul->u[12] == 0x06
+          || ul->u[12] == 0x07 || ul->u[12] == 0x15
+          || ul->u[12] == 0x16 || ul->u[12] == 0x17 || ul->u[12] == 0x18));
 }
 
 /* SMPTE 379M 8 */
 gboolean
-mxf_is_generic_container_essence_container_label (const MXFUL * key)
+mxf_is_generic_container_essence_container_label (const MXFUL * ul)
 {
-  return (key->u[0] == 0x06 &&
-      key->u[1] == 0x0e &&
-      key->u[2] == 0x2b &&
-      key->u[3] == 0x34 &&
-      key->u[4] == 0x04 &&
-      key->u[5] == 0x01 &&
-      key->u[6] == 0x01 &&
-      key->u[8] == 0x0d &&
-      key->u[9] == 0x01 &&
-      key->u[10] == 0x03 &&
-      key->u[11] == 0x01 && (key->u[12] == 0x01 || key->u[12] == 0x02));
+  return (mxf_ul_is_subclass (MXF_UL
+          (GENERIC_CONTAINER_ESSENCE_CONTAINER_LABEL), ul) && (ul->u[12] == 0x01
+          || ul->u[12] == 0x02));
 }
 
 /* Essence container label found in files generated by Avid */
-static const guint8 avid_essence_container_label[] = {
-  0x06, 0x0e, 0x2b, 0x34, 0x01, 0x01, 0x01, 0xff, 0x4b, 0x46, 0x41, 0x41, 0x00,
-  0x0d, 0x4d, 0x4f
-};
-
 gboolean
-mxf_is_avid_essence_container_label (const MXFUL * key)
+mxf_is_avid_essence_container_label (const MXFUL * ul)
 {
-  return (memcmp (&key->u, avid_essence_container_label, 16) == 0);
+  return (mxf_ul_is_subclass (MXF_UL (AVID_ESSENCE_CONTAINER_ESSENCE_LABEL),
+          ul));
 }
 
 /* Essence element key found in files generated by Avid */
-static const guint8 avid_essence_element_ul[] = {
-  0x06, 0x0e, 0x2b, 0x34, 0x01, 0x02, 0x01, 0x01, 0x0e, 0x04, 0x03, 0x01, 0x00,
-  0x00, 0x00, 0x00
-};
-
-gboolean
-mxf_is_avid_essence_container_essence_element (const MXFUL * key)
-{
-  return (memcmp (&key->u, avid_essence_element_ul, 12) == 0);
-}
-
 gboolean
-mxf_ul_is_equal (const MXFUL * a, const MXFUL * b)
+mxf_is_avid_essence_container_essence_element (const MXFUL * ul)
 {
-  return (memcmp (a, b, 16) == 0);
-}
-
-gboolean
-mxf_ul_is_zero (const MXFUL * key)
-{
-  return (memcmp (key, &key_zero, 16) == 0);
-}
-
-guint
-mxf_ul_hash (const MXFUL * key)
-{
-  guint32 ret = 0;
-  guint i;
-
-  for (i = 0; i < 4; i++)
-    ret ^=
-        (key->u[i * 4 + 0] << 24) | (key->u[i * 4 + 1] << 16) | (key->u[i * 4 +
-            2] << 8) | (key->u[i * 4 + 3] << 0);
-
-  return ret;
-}
-
-gchar *
-mxf_ul_to_string (const MXFUL * key, gchar str[48])
-{
-  g_return_val_if_fail (key != NULL, NULL);
-  g_return_val_if_fail (str != NULL, NULL);
-
-  g_snprintf (str, 48,
-      "%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x",
-      key->u[0], key->u[1], key->u[2], key->u[3], key->u[4], key->u[5],
-      key->u[6], key->u[7], key->u[8], key->u[9], key->u[10], key->u[11],
-      key->u[12], key->u[13], key->u[14], key->u[15]);
-
-  return str;
+  return (mxf_ul_is_subclass (MXF_UL (AVID_ESSENCE_CONTAINER_ESSENCE_ELEMENT),
+          ul));
 }
 
 gboolean
@@ -476,57 +370,6 @@ mxf_product_version_is_valid (const MXFProductVersion * version)
   return (memcmp (version, &null, sizeof (MXFProductVersion)) == 0);
 }
 
-gboolean
-mxf_ul_array_parse (MXFUL ** array, guint32 * count, const guint8 * data,
-    guint size)
-{
-  guint32 element_count, element_size;
-  guint i;
-
-  g_return_val_if_fail (array != NULL, FALSE);
-  g_return_val_if_fail (count != NULL, FALSE);
-  g_return_val_if_fail (data != NULL, FALSE);
-
-  if (size < 8)
-    return FALSE;
-
-  element_count = GST_READ_UINT32_BE (data);
-  data += 4;
-  size -= 4;
-
-  if (element_count == 0) {
-    *array = NULL;
-    *count = 0;
-    return TRUE;
-  }
-
-  element_size = GST_READ_UINT32_BE (data);
-  data += 4;
-  size -= 4;
-
-  if (element_size != 16) {
-    *array = NULL;
-    *count = 0;
-    return FALSE;
-  }
-
-  if (16 * element_count < size) {
-    *array = NULL;
-    *count = 0;
-    return FALSE;
-  }
-
-  *array = g_new (MXFUL, element_count);
-  *count = element_count;
-
-  for (i = 0; i < element_count; i++) {
-    memcpy (&((*array)[i]), data, 16);
-    data += 16;
-  }
-
-  return TRUE;
-}
-
 /* SMPTE 377M 6.1, Table 2 */
 gboolean
 mxf_partition_pack_parse (const MXFUL * key, MXFPartitionPack * pack,
diff --git a/gst/mxf/mxfparse.h b/gst/mxf/mxfparse.h
index 4e4f7dc1..58d88d6b 100644
--- a/gst/mxf/mxfparse.h
+++ b/gst/mxf/mxfparse.h
@@ -25,6 +25,7 @@
 #include <string.h>
 
 #include "mxftypes.h"
+#include "mxful.h"
 #include "mxfmetadata.h"
 
 typedef GstFlowReturn (*MXFEssenceElementHandleFunc) (const MXFUL *key, GstBuffer *buffer, GstCaps *caps, MXFMetadataTimelineTrack *track, gpointer mapping_data, GstBuffer **outbuf);
@@ -34,11 +35,6 @@ typedef struct {
   GstCaps * (*create_caps) (MXFMetadataTimelineTrack *track, GstTagList **tags, MXFEssenceElementHandleFunc *handler, gpointer *mapping_data);
 } MXFEssenceElementHandler;
 
-gchar * mxf_ul_to_string (const MXFUL *ul, gchar str[48]);
-gboolean mxf_ul_is_equal (const MXFUL *a, const MXFUL *b);
-gboolean mxf_ul_is_zero (const MXFUL *ul);
-guint mxf_ul_hash (const MXFUL *ul);
-
 gchar *mxf_umid_to_string (const MXFUMID * umid, gchar str[96]);
 MXFUMID *mxf_umid_from_string (const gchar *str, MXFUMID * umid);
 gboolean mxf_umid_is_equal (const MXFUMID *a, const MXFUMID *b);
@@ -82,8 +78,6 @@ gboolean mxf_timestamp_is_unknown (const MXFTimestamp *a);
 gint mxf_timestamp_compare (const MXFTimestamp *a, const MXFTimestamp *b);
 gchar *mxf_timestamp_to_string (const MXFTimestamp *t, gchar str[32]);
 
-gboolean mxf_ul_array_parse (MXFUL **array, guint32 *count, const guint8 *data, guint size);
-
 gboolean mxf_partition_pack_parse (const MXFUL *key, MXFPartitionPack *pack, const guint8 *data, guint size);
 void mxf_partition_pack_reset (MXFPartitionPack *pack);
 
diff --git a/gst/mxf/mxftypes.h b/gst/mxf/mxftypes.h
index f0878597..ffb40d9c 100644
--- a/gst/mxf/mxftypes.h
+++ b/gst/mxf/mxftypes.h
@@ -29,6 +29,10 @@ typedef struct {
   guint8 u[16];
 } MXFUL;
 
+typedef struct {
+  guint8 u[16];
+} MXFUUID;
+
 /* SMPTE 377M 3.2 */
 typedef struct {
   guint8 u[32];
diff --git a/gst/mxf/mxful.c b/gst/mxf/mxful.c
new file mode 100644
index 00000000..b88b2ff2
--- /dev/null
+++ b/gst/mxf/mxful.c
@@ -0,0 +1,284 @@
+/* GStreamer
+ * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+
+#include "mxful.h"
+
+const MXFUL _mxf_ul_table[] = {
+  /* SMPTE */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x00,}},
+  /* FILL, SMPTE 336M */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x01, 0x01, 0x01, 0x01,
+          0x03, 0x01, 0x02, 0x10, 0x01, 0x00,}},
+  /* PARTITION_PACK, SMPTE 377M 6.1 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01,
+          0x0d, 0x01, 0x02, 0x01, 0x01, 0x00,}},
+  /* PRIMER_PACK, SMPTE 377M 8.1 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01,
+          0x0d, 0x01, 0x02, 0x01, 0x01, 0x05, 0x01, 0x00}},
+  /* METADATA, SMPTE 377M 8.6 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01,
+          0x0d, 0x01, 0x01, 0x01, 0x01, 0x00,}},
+  /* DESCRIPTIVE_METADATA, SMPTE 377M 8.7.3 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x00, 0x01, 0x01,
+          0x0d, 0x01, 0x04, 0x01, 0x00,}},
+  /* RANDOM_INDEX_PACK, SMPTE 377M 11.1 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x05, 0x01, 0x01,
+          0x0d, 0x01, 0x02, 0x01, 0x01, 0x11, 0x01, 0x00}},
+  /* INDEX_TABLE_SEGMENT, SMPTE 377M 10.2.2 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x53, 0x01, 0x01,
+          0x0d, 0x01, 0x02, 0x01, 0x01, 0x10, 0x01, 0x00}},
+  /* GENERIC_CONTAINER_SYSTEM_ITEM, SMPTE 379M 6.2.1 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x02, 0x00, 0x01, 0x00,
+          0x0d, 0x01, 0x03, 0x01, 0x00}},
+  /* GENERIC_CONTAINER_ESSENCE_ELEMENT, SMPTE 379M 7.1 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x01, 0x02, 0x01, 0x00,
+          0x0d, 0x01, 0x03, 0x01, 0x00,}},
+  /* GENERIC_CONTAINER_ESSENCE_CONTAINER_LABEL, SMPTE 379M 8 */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x04, 0x01, 0x01, 0x00,
+          0x0d, 0x01, 0x03, 0x01, 0x00,}},
+  /* AVID_ESSENCE_CONTAINER_ESSENCE_ELEMENT, undocumented */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x01, 0x02, 0x01, 0x01,
+          0x0e, 0x04, 0x03, 0x01, 0x00,}},
+  /* AVID_ESSENCE_CONTAINER_ESSENCE_LABEL, undocumented */
+  {{0x06, 0x0e, 0x2b, 0x34, 0x01, 0x01, 0x01, 0xff,
+          0x4b, 0x46, 0x41, 0x41, 0x00, 0x0d, 0x4d, 0x4f}},
+};
+
+gboolean
+mxf_ul_is_equal (const MXFUL * a, const MXFUL * b)
+{
+  guint i;
+
+  g_return_val_if_fail (a != NULL, FALSE);
+  g_return_val_if_fail (b != NULL, FALSE);
+
+  for (i = 0; i < 16; i++) {
+    /* registry version */
+    if (i == 7)
+      continue;
+
+    if (a->u[i] != b->u[i])
+      return FALSE;
+  }
+
+  return TRUE;
+}
+
+gboolean
+mxf_ul_is_subclass (const MXFUL * class, const MXFUL * subclass)
+{
+  guint i, j;
+
+  g_return_val_if_fail (class != NULL, FALSE);
+  g_return_val_if_fail (subclass != NULL, FALSE);
+
+  for (i = 0; i < 16; i++) {
+    if (i == 7)
+      /* registry version */
+      continue;
+
+    if (class->u[i] == 0x00) {
+      gboolean terminated = TRUE;
+
+      for (j = i; j < 16; j++) {
+        if (class->u[j] != 0x00) {
+          terminated = FALSE;
+          break;
+        }
+      }
+
+      if (terminated)
+        return TRUE;
+
+      continue;
+    }
+
+    if (class->u[i] != subclass->u[i])
+      return FALSE;
+  }
+
+  return TRUE;
+}
+
+gboolean
+mxf_ul_is_zero (const MXFUL * ul)
+{
+  static const guint8 zero[16] = { 0, };
+
+  g_return_val_if_fail (ul != NULL, FALSE);
+
+  return (memcmp (ul, &zero, 16) == 0);
+}
+
+gboolean
+mxf_ul_is_valid (const MXFUL * ul)
+{
+  guint i, j;
+
+  g_return_val_if_fail (ul != NULL, FALSE);
+
+  for (i = 0; i < 16; i++) {
+    if (ul->u[i] == 0x00) {
+      for (j = i; j < 16; j++) {
+        if (ul->u[j] != 0x00)
+          return FALSE;
+      }
+
+      return TRUE;
+    }
+
+    if (ul->u[i] > 0x7f)
+      return FALSE;
+  }
+
+  return TRUE;
+}
+
+guint
+mxf_ul_hash (const MXFUL * ul)
+{
+  guint32 ret = 0;
+  guint i;
+
+  g_return_val_if_fail (ul != NULL, 0);
+
+  for (i = 0; i < 4; i++)
+    ret ^= (ul->u[i * 4 + 0] << 24) |
+        (ul->u[i * 4 + 1] << 16) |
+        (ul->u[i * 4 + 2] << 8) | (ul->u[i * 4 + 3] << 0);
+
+  return ret;
+}
+
+gchar *
+mxf_ul_to_string (const MXFUL * ul, gchar str[48])
+{
+  gchar *ret = str;
+
+  g_return_val_if_fail (ul != NULL, NULL);
+
+  if (ret == NULL)
+    ret = g_malloc (48);
+
+  g_snprintf (ret, 48,
+      "%02x.%02x.%02x.%02x."
+      "%02x.%02x.%02x.%02x."
+      "%02x.%02x.%02x.%02x."
+      "%02x.%02x.%02x.%02x",
+      ul->u[0], ul->u[1], ul->u[2], ul->u[3],
+      ul->u[4], ul->u[5], ul->u[6], ul->u[7],
+      ul->u[8], ul->u[9], ul->u[10], ul->u[11],
+      ul->u[12], ul->u[13], ul->u[14], ul->u[15]);
+
+  return ret;
+}
+
+MXFUL *
+mxf_ul_from_string (const gchar * str, MXFUL * ul)
+{
+  MXFUL *ret = ul;
+  gint len;
+  guint i, j;
+
+  g_return_val_if_fail (str != NULL, NULL);
+
+  len = strlen (str);
+  if (len != 47) {
+    GST_ERROR ("Invalid UL string length %d, should be 47", len);
+    return NULL;
+  }
+
+  if (ret == NULL)
+    ret = g_new0 (MXFUL, 1);
+
+  memset (ret, 0, 16);
+
+  for (i = 0, j = 0; i < 16; i++) {
+    if (!g_ascii_isxdigit (str[j]) ||
+        !g_ascii_isxdigit (str[j + 1]) ||
+        (str[j + 2] != '.' && str[j + 2] != '\0')) {
+      GST_ERROR ("Invalid UL string '%s'", str);
+      if (ul == NULL)
+        g_free (ret);
+      return NULL;
+    }
+
+    ret->u[i] = (g_ascii_xdigit_value (str[j]) << 4) |
+        (g_ascii_xdigit_value (str[j + 1]));
+    j += 3;
+  }
+  return ret;
+}
+
+gboolean
+mxf_ul_array_parse (MXFUL ** array, guint32 * count, const guint8 * data,
+    guint size)
+{
+  guint32 element_count, element_size;
+  guint i;
+
+  g_return_val_if_fail (array != NULL, FALSE);
+  g_return_val_if_fail (count != NULL, FALSE);
+  g_return_val_if_fail (data != NULL, FALSE);
+
+  if (size < 8)
+    return FALSE;
+
+  element_count = GST_READ_UINT32_BE (data);
+  data += 4;
+  size -= 4;
+
+  if (element_count == 0) {
+    *array = NULL;
+    *count = 0;
+    return TRUE;
+  }
+
+  element_size = GST_READ_UINT32_BE (data);
+  data += 4;
+  size -= 4;
+
+  if (element_size != 16) {
+    *array = NULL;
+    *count = 0;
+    return FALSE;
+  }
+
+  if (16 * element_count < size) {
+    *array = NULL;
+    *count = 0;
+    return FALSE;
+  }
+
+  *array = g_new (MXFUL, element_count);
+  *count = element_count;
+
+  for (i = 0; i < element_count; i++) {
+    memcpy (&((*array)[i]), data, 16);
+    data += 16;
+  }
+
+  return TRUE;
+}
diff --git a/gst/mxf/mxful.h b/gst/mxf/mxful.h
new file mode 100644
index 00000000..b187229d
--- /dev/null
+++ b/gst/mxf/mxful.h
@@ -0,0 +1,59 @@
+/* GStreamer
+ * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __MXF_UL_H__
+#define __MXF_UL_H__
+
+#include <gst/gst.h>
+
+#include "mxftypes.h"
+
+typedef enum {
+  MXF_UL_SMPTE = 0,
+  MXF_UL_FILL,
+  MXF_UL_PARTITION_PACK,
+  MXF_UL_PRIMER_PACK,
+  MXF_UL_METADATA,
+  MXF_UL_DESCRIPTIVE_METADATA,
+  MXF_UL_RANDOM_INDEX_PACK,
+  MXF_UL_INDEX_TABLE_SEGMENT,
+  MXF_UL_GENERIC_CONTAINER_SYSTEM_ITEM,
+  MXF_UL_GENERIC_CONTAINER_ESSENCE_ELEMENT,
+  MXF_UL_GENERIC_CONTAINER_ESSENCE_CONTAINER_LABEL,
+  MXF_UL_AVID_ESSENCE_CONTAINER_ESSENCE_ELEMENT,
+  MXF_UL_AVID_ESSENCE_CONTAINER_ESSENCE_LABEL,
+  MXF_UL_MAX
+} MXFULId;
+
+extern const MXFUL _mxf_ul_table[MXF_UL_MAX];
+
+#define MXF_UL(id) (&_mxf_ul_table[MXF_UL_##id])
+
+gboolean mxf_ul_is_equal (const MXFUL *a, const MXFUL *b);
+gboolean mxf_ul_is_subclass (const MXFUL *class, const MXFUL *subclass);
+gboolean mxf_ul_is_zero (const MXFUL *ul);
+gboolean mxf_ul_is_valid (const MXFUL *ul);
+guint mxf_ul_hash (const MXFUL *ul);
+
+gchar * mxf_ul_to_string (const MXFUL *ul, gchar str[48]);
+MXFUL * mxf_ul_from_string (const gchar *str, MXFUL *ul);
+
+gboolean mxf_ul_array_parse (MXFUL **array, guint32 *count, const guint8 *data, guint size);
+
+#endif /* __MXF_UL_H__ */