gst/mxf/: Implement an essence element handling registry and use this instead of an hardcoded, large if-then-else block.

Original commit message from CVS:
* gst/mxf/mxfaes-bwf.c: (mxf_is_aes_bwf_essence_track),
(mxf_bwf_handle_essence_element),
(mxf_aes3_handle_essence_element), (mxf_bwf_create_caps),
(mxf_aes3_create_caps), (mxf_aes_bwf_create_caps),
(mxf_aes_bwf_init):
* gst/mxf/mxfaes-bwf.h:
* gst/mxf/mxfalaw.c: (mxf_is_alaw_essence_track),
(mxf_alaw_handle_essence_element), (mxf_alaw_create_caps),
(mxf_alaw_init):
* gst/mxf/mxfalaw.h:
* gst/mxf/mxfd10.c: (mxf_is_d10_essence_track),
(mxf_d10_picture_handle_essence_element),
(mxf_d10_sound_handle_essence_element), (mxf_d10_create_caps),
(mxf_d10_init):
* gst/mxf/mxfd10.h:
* gst/mxf/mxfdemux.c: (gst_mxf_demux_reset_metadata),
(gst_mxf_demux_handle_header_metadata_update_streams),
(gst_mxf_demux_handle_generic_container_essence_element):
* gst/mxf/mxfdv-dif.c: (mxf_is_dv_dif_essence_track),
(mxf_dv_dif_handle_essence_element), (mxf_dv_dif_create_caps),
(mxf_dv_dif_init):
* gst/mxf/mxfdv-dif.h:
* gst/mxf/mxfjpeg2000.c: (mxf_is_jpeg2000_essence_track),
(mxf_jpeg2000_handle_essence_element), (mxf_jpeg2000_create_caps),
(mxf_jpeg2000_init):
* gst/mxf/mxfjpeg2000.h:
* gst/mxf/mxfmpeg.c: (mxf_is_mpeg_essence_track),
(mxf_mpeg_video_handle_essence_element),
(mxf_mpeg_audio_handle_essence_element), (mxf_mpeg_es_create_caps),
(mxf_mpeg_create_caps), (mxf_mpeg_init):
* gst/mxf/mxfmpeg.h:
* gst/mxf/mxfparse.c: (mxf_essence_element_handler_register),
(mxf_essence_element_handler_find):
* gst/mxf/mxfparse.h:
* gst/mxf/mxfup.c: (mxf_is_up_essence_track),
(mxf_up_handle_essence_element), (mxf_up_rgba_create_caps),
(mxf_up_create_caps), (mxf_up_init):
* gst/mxf/mxfup.h:
Implement an essence element handling registry and use this instead
of an hardcoded, large if-then-else block.

17 files changed, 387 insertions, 415 deletions

diff --git a/gst/mxf/mxfaes-bwf.c b/gst/mxf/mxfaes-bwf.c
index e88183ed..b684c193 100644
--- a/gst/mxf/mxfaes-bwf.c
+++ b/gst/mxf/mxfaes-bwf.c
@@ -41,6 +41,78 @@ GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
 #define GST_CAT_DEFAULT mxf_debug
 
 /* SMPTE 382M Annex 1 */
+#define MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR \
+  (mxf_metadata_wave_audio_essence_descriptor_get_type())
+#define MXF_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR, MXFMetadataWaveAudioEssenceDescriptor))
+#define MXF_IS_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR))
+typedef struct _MXFMetadataWaveAudioEssenceDescriptor
+    MXFMetadataWaveAudioEssenceDescriptor;
+typedef MXFMetadataBaseClass MXFMetadataWaveAudioEssenceDescriptorClass;
+GType mxf_metadata_wave_audio_essence_descriptor_get_type (void);
+
+struct _MXFMetadataWaveAudioEssenceDescriptor
+{
+  MXFMetadataGenericSoundEssenceDescriptor parent;
+
+  guint16 block_align;
+  guint8 sequence_offset;
+
+  guint32 avg_bps;
+
+  MXFUL channel_assignment;
+
+  guint32 peak_envelope_version;
+  guint32 peak_envelope_format;
+  guint32 points_per_peak_value;
+  guint32 peak_envelope_block_size;
+  guint32 peak_channels;
+  guint32 peak_frames;
+  gint64 peak_of_peaks_position;
+  MXFTimestamp peak_envelope_timestamp;
+
+  guint8 *peak_envelope_data;
+  guint16 peak_envelope_data_length;
+};
+
+/* SMPTE 382M Annex 2 */
+#define MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR \
+  (mxf_metadata_aes3_audio_essence_descriptor_get_type())
+#define MXF_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR, MXFMetadataAES3AudioEssenceDescriptor))
+#define MXF_IS_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR))
+typedef struct _MXFMetadataAES3AudioEssenceDescriptor
+    MXFMetadataAES3AudioEssenceDescriptor;
+typedef MXFMetadataBaseClass MXFMetadataAES3AudioEssenceDescriptorClass;
+GType mxf_metadata_aes3_audio_essence_descriptor_get_type (void);
+
+struct _MXFMetadataAES3AudioEssenceDescriptor
+{
+  MXFMetadataWaveAudioEssenceDescriptor parent;
+
+  guint8 emphasis;
+  guint16 block_start_offset;
+  guint8 auxiliary_bits_mode;
+
+  guint32 n_channel_status_mode;
+  guint8 *channel_status_mode;
+
+  guint32 n_fixed_channel_status_data;
+  guint8 **fixed_channel_status_data;
+
+  guint32 n_user_data_mode;
+  guint8 *user_data_mode;
+
+  guint32 n_fixed_user_data;
+  guint8 **fixed_user_data;
+
+  guint32 linked_timecode_track_id;
+  guint8 stream_number;
+};
+
+/* SMPTE 382M Annex 1 */
 G_DEFINE_TYPE (MXFMetadataWaveAudioEssenceDescriptor,
     mxf_metadata_wave_audio_essence_descriptor,
     MXF_TYPE_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR);
@@ -463,20 +535,20 @@ static void
       mxf_metadata_aes3_audio_essence_descriptor_handle_tag;
 }
 
-gboolean
-mxf_is_aes_bwf_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_aes_bwf_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor for this track");
     return FALSE;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -500,9 +572,10 @@ mxf_is_aes_bwf_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_bwf_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -519,9 +592,9 @@ mxf_bwf_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 
 static GstFlowReturn
 mxf_aes3_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps, MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -555,10 +628,9 @@ static const MXFUL mxf_sound_essence_compression_alaw =
 };
 
 static GstCaps *
-mxf_bwf_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track,
+mxf_bwf_create_caps (MXFMetadataTimelineTrack * track,
     MXFMetadataGenericSoundEssenceDescriptor * descriptor, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   GstCaps *ret = NULL;
   MXFMetadataWaveAudioEssenceDescriptor *wa_descriptor = NULL;
@@ -653,6 +725,8 @@ mxf_bwf_create_caps (MXFMetadataGenericPackage * package,
         mxf_ul_to_string (&descriptor->sound_essence_compression, str));
   }
 
+  *handler = mxf_bwf_handle_essence_element;
+
   if (!*tags)
     *tags = gst_tag_list_new ();
 
@@ -666,16 +740,13 @@ mxf_bwf_create_caps (MXFMetadataGenericPackage * package,
     gst_tag_list_add (*tags, GST_TAG_MERGE_APPEND, GST_TAG_BITRATE,
         wa_descriptor->avg_bps * 8, NULL);
 
-  *handler = mxf_bwf_handle_essence_element;
-
   return ret;
 }
 
 static GstCaps *
-mxf_aes3_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track,
+mxf_aes3_create_caps (MXFMetadataTimelineTrack * track,
     MXFMetadataGenericSoundEssenceDescriptor * descriptor, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   GstCaps *ret = NULL;
   MXFMetadataWaveAudioEssenceDescriptor *wa_descriptor = NULL;
@@ -726,42 +797,43 @@ mxf_aes3_create_caps (MXFMetadataGenericPackage * package,
   return ret;
 }
 
-GstCaps *
-mxf_aes_bwf_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_aes_bwf_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataGenericSoundEssenceDescriptor *s = NULL;
   gboolean bwf = FALSE;
   guint i;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
-    if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->descriptor[i])
-        && (track->descriptor[i]->essence_container.u[14] == 0x01
-            || track->descriptor[i]->essence_container.u[14] == 0x02
-            || track->descriptor[i]->essence_container.u[14] == 0x08)) {
-      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
+    if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->parent.
+            descriptor[i])
+        && (track->parent.descriptor[i]->essence_container.u[14] == 0x01
+            || track->parent.descriptor[i]->essence_container.u[14] == 0x02
+            || track->parent.descriptor[i]->essence_container.u[14] == 0x08)) {
+      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->parent.
+          descriptor[i];
       bwf = TRUE;
       break;
     } else
-        if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->descriptor
-            [i])
-        && (track->descriptor[i]->essence_container.u[14] == 0x03
-            || track->descriptor[i]->essence_container.u[14] == 0x04
-            || track->descriptor[i]->essence_container.u[14] == 0x09)) {
-
-      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
+        if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->parent.
+            descriptor[i])
+        && (track->parent.descriptor[i]->essence_container.u[14] == 0x03
+            || track->parent.descriptor[i]->essence_container.u[14] == 0x04
+            || track->parent.descriptor[i]->essence_container.u[14] == 0x09)) {
+
+      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->parent.
+          descriptor[i];
       bwf = FALSE;
       break;
     }
@@ -771,15 +843,19 @@ mxf_aes_bwf_create_caps (MXFMetadataGenericPackage * package,
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   } else if (bwf) {
-    return mxf_bwf_create_caps (package, track, s, tags, handler, mapping_data);
+    return mxf_bwf_create_caps (track, s, tags, handler, mapping_data);
   } else {
-    return mxf_aes3_create_caps (package, track, s, tags, handler,
-        mapping_data);
+    return mxf_aes3_create_caps (track, s, tags, handler, mapping_data);
   }
 
   return NULL;
 }
 
+static const MXFEssenceElementHandler mxf_aes_bwf_essence_handler = {
+  mxf_is_aes_bwf_essence_track,
+  mxf_aes_bwf_create_caps
+};
+
 void
 mxf_aes_bwf_init (void)
 {
@@ -787,4 +863,6 @@ mxf_aes_bwf_init (void)
       MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR);
   mxf_metadata_register (0x0147,
       MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR);
+
+  mxf_essence_element_handler_register (&mxf_aes_bwf_essence_handler);
 }
diff --git a/gst/mxf/mxfaes-bwf.h b/gst/mxf/mxfaes-bwf.h
index 7783a2d0..6412504e 100644
--- a/gst/mxf/mxfaes-bwf.h
+++ b/gst/mxf/mxfaes-bwf.h
@@ -29,79 +29,6 @@
 #include "mxfparse.h"
 #include "mxfmetadata.h"
 
-/* SMPTE 382M Annex 1 */
-#define MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR \
-  (mxf_metadata_wave_audio_essence_descriptor_get_type())
-#define MXF_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR, MXFMetadataWaveAudioEssenceDescriptor))
-#define MXF_IS_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_WAVE_AUDIO_ESSENCE_DESCRIPTOR))
-typedef struct _MXFMetadataWaveAudioEssenceDescriptor MXFMetadataWaveAudioEssenceDescriptor;
-typedef MXFMetadataBaseClass MXFMetadataWaveAudioEssenceDescriptorClass;
-GType mxf_metadata_wave_audio_essence_descriptor_get_type (void);
-
-struct _MXFMetadataWaveAudioEssenceDescriptor {
-  MXFMetadataGenericSoundEssenceDescriptor parent;
-
-  guint16 block_align;
-  guint8 sequence_offset;
-
-  guint32 avg_bps;
-
-  MXFUL channel_assignment;
-
-  guint32 peak_envelope_version;
-  guint32 peak_envelope_format;
-  guint32 points_per_peak_value;
-  guint32 peak_envelope_block_size;
-  guint32 peak_channels;
-  guint32 peak_frames;
-  gint64 peak_of_peaks_position;
-  MXFTimestamp peak_envelope_timestamp;
-
-  guint8 *peak_envelope_data;
-  guint16 peak_envelope_data_length;
-};
-
-/* SMPTE 382M Annex 2 */
-#define MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR \
-  (mxf_metadata_aes3_audio_essence_descriptor_get_type())
-#define MXF_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR, MXFMetadataAES3AudioEssenceDescriptor))
-#define MXF_IS_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_AES3_AUDIO_ESSENCE_DESCRIPTOR))
-typedef struct _MXFMetadataAES3AudioEssenceDescriptor MXFMetadataAES3AudioEssenceDescriptor;
-typedef MXFMetadataBaseClass MXFMetadataAES3AudioEssenceDescriptorClass;
-GType mxf_metadata_aes3_audio_essence_descriptor_get_type (void);
-
-struct _MXFMetadataAES3AudioEssenceDescriptor {
-  MXFMetadataWaveAudioEssenceDescriptor parent;
-
-  guint8 emphasis;
-  guint16 block_start_offset;
-  guint8 auxiliary_bits_mode;
-
-  guint32 n_channel_status_mode;
-  guint8 *channel_status_mode;
-
-  guint32 n_fixed_channel_status_data;
-  guint8 **fixed_channel_status_data;
-
-  guint32 n_user_data_mode;
-  guint8 *user_data_mode;
-
-  guint32 n_fixed_user_data;
-  guint8 **fixed_user_data;
-
-  guint32 linked_timecode_track_id;
-  guint8 stream_number;
-};
-
-gboolean mxf_is_aes_bwf_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_aes_bwf_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_aes_bwf_init (void);
 
 #endif /* __MXF_AES_BWF_H__ */
diff --git a/gst/mxf/mxfalaw.c b/gst/mxf/mxfalaw.c
index 6b7e419b..437f82d9 100644
--- a/gst/mxf/mxfalaw.c
+++ b/gst/mxf/mxfalaw.c
@@ -33,18 +33,18 @@
 GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
 #define GST_CAT_DEFAULT mxf_debug
 
-gboolean
-mxf_is_alaw_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_alaw_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL)
+  if (track->parent.descriptor == NULL)
     return FALSE;
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -63,9 +63,10 @@ mxf_is_alaw_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_alaw_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -80,29 +81,29 @@ mxf_alaw_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 }
 
 
-GstCaps *
-mxf_alaw_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_alaw_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataGenericSoundEssenceDescriptor *s = NULL;
   guint i;
   GstCaps *caps = NULL;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
-    if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->descriptor[i])) {
-      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
+    if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->parent.
+            descriptor[i])) {
+      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->parent.
+          descriptor[i];
       break;
     }
   }
@@ -135,7 +136,13 @@ mxf_alaw_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
+static const MXFEssenceElementHandler mxf_alaw_essence_element_handler = {
+  mxf_is_alaw_essence_track,
+  mxf_alaw_create_caps
+};
+
 void
 mxf_alaw_init (void)
 {
+  mxf_essence_element_handler_register (&mxf_alaw_essence_element_handler);
 }
diff --git a/gst/mxf/mxfalaw.h b/gst/mxf/mxfalaw.h
index 2a1279cc..89e2a0b9 100644
--- a/gst/mxf/mxfalaw.h
+++ b/gst/mxf/mxfalaw.h
@@ -28,11 +28,6 @@
 
 #include "mxfparse.h"
 
-gboolean mxf_is_alaw_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_alaw_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_alaw_init (void);
 
 #endif /* __MXF_ALAW_H__ */
diff --git a/gst/mxf/mxfd10.c b/gst/mxf/mxfd10.c
index f7d29140..aaa4477b 100644
--- a/gst/mxf/mxfd10.c
+++ b/gst/mxf/mxfd10.c
@@ -40,18 +40,18 @@ typedef struct
   guint width, channels;
 } MXFD10AudioMappingData;
 
-gboolean
-mxf_is_d10_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_d10_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL)
+  if (track->parent.descriptor == NULL)
     return FALSE;
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -71,9 +71,10 @@ mxf_is_d10_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_d10_picture_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -88,9 +89,10 @@ mxf_d10_picture_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 
 static GstFlowReturn
 mxf_d10_sound_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   guint i, j, nsamples;
   const guint8 *indata;
@@ -153,35 +155,35 @@ mxf_d10_sound_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
   return GST_FLOW_OK;
 }
 
-GstCaps *
-mxf_d10_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_d10_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataGenericPictureEssenceDescriptor *p = NULL;
   MXFMetadataGenericSoundEssenceDescriptor *s = NULL;
   guint i;
   GstCaps *caps = NULL;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
     if (MXF_IS_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (track->
-            descriptor[i])) {
-      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->descriptor[i];
+            parent.descriptor[i])) {
+      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
       break;
     } else if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->
-            descriptor[i])) {
-      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
+            parent.descriptor[i])) {
+      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->parent.
+          descriptor[i];
       break;
     }
   }
@@ -243,7 +245,13 @@ mxf_d10_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
+static const MXFEssenceElementHandler mxf_d10_essence_element_handler = {
+  mxf_is_d10_essence_track,
+  mxf_d10_create_caps
+};
+
 void
 mxf_d10_init (void)
 {
+  mxf_essence_element_handler_register (&mxf_d10_essence_element_handler);
 }
diff --git a/gst/mxf/mxfd10.h b/gst/mxf/mxfd10.h
index e3167d1b..c98ab172 100644
--- a/gst/mxf/mxfd10.h
+++ b/gst/mxf/mxfd10.h
@@ -28,11 +28,6 @@
 
 #include "mxfparse.h"
 
-gboolean mxf_is_d10_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_d10_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_d10_init (void);
 
 #endif /* __MXF_D10_H__ */
diff --git a/gst/mxf/mxfdemux.c b/gst/mxf/mxfdemux.c
index b2f43ed8..4b1a3ba1 100644
--- a/gst/mxf/mxfdemux.c
+++ b/gst/mxf/mxfdemux.c
@@ -43,8 +43,6 @@
  *     timestamp calculation, etc.
  *   - Handle timecode tracks correctly (where is this documented?)
  *   - Handle Generic container system items
- *   - Use an "essence element/track handling" registry instead of the large if-then-else
- *     block when detecting the codec
  *   - Force synchronization of tracks. Packets that have the timestamp are not required
  *     to be stored at the same position in the essence stream, especially if tracks
  *     with different source packages (body sid) are used.
@@ -69,13 +67,6 @@
 #include "mxfdemux.h"
 #include "mxfparse.h"
 #include "mxfmetadata.h"
-#include "mxfaes-bwf.h"
-#include "mxfmpeg.h"
-#include "mxfdv-dif.h"
-#include "mxfalaw.h"
-#include "mxfjpeg2000.h"
-#include "mxfd10.h"
-#include "mxfup.h"
 
 #include <string.h>
 
@@ -109,8 +100,9 @@ typedef struct
   GstFlowReturn last_flow;
 
   guint64 essence_element_count;
-  MXFEssenceElementHandler handle_essence_element;
   gpointer mapping_data;
+  const MXFEssenceElementHandler *handler;
+  MXFEssenceElementHandleFunc handle_func;
 
   GstTagList *tags;
 
@@ -235,6 +227,9 @@ gst_mxf_demux_reset_metadata (GstMXFDemux * demux)
     for (i = 0; i < demux->src->len; i++) {
       GstMXFDemuxPad *pad = g_ptr_array_index (demux->src, i);
 
+      pad->handler = NULL;
+      pad->handle_func = NULL;
+
       pad->material_track = NULL;
       pad->material_package = NULL;
       pad->component = NULL;
@@ -559,11 +554,11 @@ gst_mxf_demux_choose_package (GstMXFDemux * demux)
 
   for (i = 0; i < demux->preface->content_storage->n_packages; i++) {
     if (demux->preface->content_storage->packages[i] &&
-        MXF_IS_METADATA_MATERIAL_PACKAGE (demux->preface->content_storage->
-            packages[i])) {
+        MXF_IS_METADATA_MATERIAL_PACKAGE (demux->preface->
+            content_storage->packages[i])) {
       ret =
-          MXF_METADATA_GENERIC_PACKAGE (demux->preface->content_storage->
-          packages[i]);
+          MXF_METADATA_GENERIC_PACKAGE (demux->preface->
+          content_storage->packages[i]);
       break;
     }
   }
@@ -736,90 +731,23 @@ gst_mxf_demux_handle_header_metadata_update_streams (GstMXFDemux * demux)
     pad->source_package = source_package;
     pad->source_track = source_track;
 
-    pad->handle_essence_element = NULL;
+    pad->handler = NULL;
     g_free (pad->mapping_data);
+    pad->handle_func = NULL;
     pad->mapping_data = NULL;
 
-    switch (track->parent.type) {
-      case MXF_METADATA_TRACK_PICTURE_ESSENCE:
-        if (mxf_is_mpeg_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_mpeg_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_dv_dif_essence_track ((MXFMetadataTrack *)
-                source_track))
-          caps =
-              mxf_dv_dif_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_jpeg2000_essence_track ((MXFMetadataTrack *)
-                source_track))
-          caps =
-              mxf_jpeg2000_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_d10_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_d10_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_up_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_up_create_caps (MXF_METADATA_GENERIC_PACKAGE (source_package),
-              (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        break;
-      case MXF_METADATA_TRACK_SOUND_ESSENCE:
-        if (mxf_is_aes_bwf_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_aes_bwf_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_dv_dif_essence_track ((MXFMetadataTrack *)
-                source_track))
-          caps =
-              mxf_dv_dif_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_alaw_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_alaw_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_mpeg_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_mpeg_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_d10_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_d10_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        break;
-      case MXF_METADATA_TRACK_DATA_ESSENCE:
-        if (mxf_is_dv_dif_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_dv_dif_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_mpeg_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_mpeg_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        else if (mxf_is_d10_essence_track ((MXFMetadataTrack *) source_track))
-          caps =
-              mxf_d10_create_caps (MXF_METADATA_GENERIC_PACKAGE
-              (source_package), (MXFMetadataTrack *) source_track, &pad->tags,
-              &pad->handle_essence_element, &pad->mapping_data);
-        break;
-      default:
-        g_assert_not_reached ();
-        break;
+    pad->handler = mxf_essence_element_handler_find (source_track);
+
+    if (!pad->handler) {
+      GST_WARNING_OBJECT (demux, "No essence element handler for track found");
+      gst_object_unref (pad);
+      continue;
     }
 
+    caps =
+        pad->handler->create_caps (source_track, &pad->tags, &pad->handle_func,
+        &pad->mapping_data);
+
     if (!caps) {
       GST_WARNING_OBJECT (demux, "No caps created, ignoring stream");
       gst_object_unref (pad);
@@ -1081,13 +1009,11 @@ gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux,
   GST_BUFFER_OFFSET_END (inbuf) = GST_BUFFER_OFFSET_NONE;
   gst_buffer_set_caps (inbuf, pad->caps);
 
-  if (pad->handle_essence_element) {
+  if (pad->handle_func) {
     /* Takes ownership of inbuf */
     ret =
-        pad->handle_essence_element (key, inbuf, pad->caps,
-        (MXFMetadataGenericPackage *) pad->source_package,
-        (MXFMetadataTrack *) pad->source_track, pad->component,
-        pad->mapping_data, &outbuf);
+        pad->handle_func (key, inbuf, pad->caps,
+        pad->source_track, pad->component, pad->mapping_data, &outbuf);
     inbuf = NULL;
   } else {
     outbuf = inbuf;
diff --git a/gst/mxf/mxfdv-dif.c b/gst/mxf/mxfdv-dif.c
index 25bd2a95..4cae16b4 100644
--- a/gst/mxf/mxfdv-dif.c
+++ b/gst/mxf/mxfdv-dif.c
@@ -39,18 +39,18 @@
 GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
 #define GST_CAT_DEFAULT mxf_debug
 
-gboolean
-mxf_is_dv_dif_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_dv_dif_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL)
+  if (track->parent.descriptor == NULL)
     return FALSE;
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -68,9 +68,10 @@ mxf_is_dv_dif_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_dv_dif_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -84,30 +85,28 @@ mxf_dv_dif_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 }
 
 
-GstCaps *
-mxf_dv_dif_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_dv_dif_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataFileDescriptor *f = NULL;
   guint i;
   GstCaps *caps = NULL;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
-    if (MXF_IS_METADATA_FILE_DESCRIPTOR (track->descriptor[i]) &&
-        !MXF_IS_METADATA_MULTIPLE_DESCRIPTOR (track->descriptor[i])) {
-      f = track->descriptor[i];
+    if (MXF_IS_METADATA_FILE_DESCRIPTOR (track->parent.descriptor[i]) &&
+        !MXF_IS_METADATA_MULTIPLE_DESCRIPTOR (track->parent.descriptor[i])) {
+      f = track->parent.descriptor[i];
     }
   }
 
@@ -138,8 +137,13 @@ mxf_dv_dif_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
+static const MXFEssenceElementHandler mxf_dv_dif_essence_element_handler = {
+  mxf_is_dv_dif_essence_track,
+  mxf_dv_dif_create_caps
+};
+
 void
 mxf_dv_dif_init (void)
 {
-
+  mxf_essence_element_handler_register (&mxf_dv_dif_essence_element_handler);
 }
diff --git a/gst/mxf/mxfdv-dif.h b/gst/mxf/mxfdv-dif.h
index 2e59e5e8..158c2930 100644
--- a/gst/mxf/mxfdv-dif.h
+++ b/gst/mxf/mxfdv-dif.h
@@ -28,11 +28,6 @@
 
 #include "mxfparse.h"
 
-gboolean mxf_is_dv_dif_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_dv_dif_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_dv_dif_init (void);
 
 #endif /* __MXF_DV_DIF_H__ */
diff --git a/gst/mxf/mxfjpeg2000.c b/gst/mxf/mxfjpeg2000.c
index 818f6b25..1bc54c12 100644
--- a/gst/mxf/mxfjpeg2000.c
+++ b/gst/mxf/mxfjpeg2000.c
@@ -38,18 +38,18 @@
 GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
 #define GST_CAT_DEFAULT mxf_debug
 
-gboolean
-mxf_is_jpeg2000_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_jpeg2000_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL)
+  if (track->parent.descriptor == NULL)
     return FALSE;
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -68,9 +68,10 @@ mxf_is_jpeg2000_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_jpeg2000_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -84,10 +85,9 @@ mxf_jpeg2000_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 }
 
 
-GstCaps *
-mxf_jpeg2000_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_jpeg2000_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataFileDescriptor *f = NULL;
   MXFMetadataGenericPictureEssenceDescriptor *p = NULL;
@@ -95,26 +95,26 @@ mxf_jpeg2000_create_caps (MXFMetadataGenericPackage * package,
   GstCaps *caps = NULL;
   guint32 fourcc;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
     if (MXF_IS_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (track->
-            descriptor[i])) {
-      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->descriptor[i];
-      f = track->descriptor[i];
+            parent.descriptor[i])) {
+      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
+      f = track->parent.descriptor[i];
       break;
-    } else if (MXF_IS_METADATA_FILE_DESCRIPTOR (track->descriptor[i]) &&
-        !MXF_IS_METADATA_MULTIPLE_DESCRIPTOR (track->descriptor[i])) {
-      f = track->descriptor[i];
+    } else if (MXF_IS_METADATA_FILE_DESCRIPTOR (track->parent.descriptor[i]) &&
+        !MXF_IS_METADATA_MULTIPLE_DESCRIPTOR (track->parent.descriptor[i])) {
+      f = track->parent.descriptor[i];
     }
   }
 
@@ -198,7 +198,13 @@ mxf_jpeg2000_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
+static const MXFEssenceElementHandler mxf_jpeg2000_essence_element_handler = {
+  mxf_is_jpeg2000_essence_track,
+  mxf_jpeg2000_create_caps
+};
+
 void
 mxf_jpeg2000_init (void)
 {
+  mxf_essence_element_handler_register (&mxf_jpeg2000_essence_element_handler);
 }
diff --git a/gst/mxf/mxfjpeg2000.h b/gst/mxf/mxfjpeg2000.h
index d3cda750..20281d16 100644
--- a/gst/mxf/mxfjpeg2000.h
+++ b/gst/mxf/mxfjpeg2000.h
@@ -28,11 +28,6 @@
 
 #include "mxfparse.h"
 
-gboolean mxf_is_jpeg2000_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_jpeg2000_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_jpeg2000_init (void);
 
 #endif /* __MXF_JPEG2000_H__ */
diff --git a/gst/mxf/mxfmpeg.c b/gst/mxf/mxfmpeg.c
index 7ba129f9..9a9b6851 100644
--- a/gst/mxf/mxfmpeg.c
+++ b/gst/mxf/mxfmpeg.c
@@ -91,6 +91,35 @@ static const guint8 _profile_and_level_ul[] = {
   0x0a, 0x00, 0x00
 };
 
+/* SMPTE 381M 8.1 */
+#define MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR \
+  (mxf_metadata_mpeg_video_descriptor_get_type())
+#define MXF_METADATA_MPEG_VIDEO_DESCRIPTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR, MXFMetadataMPEGVideoDescriptor))
+#define MXF_IS_METADATA_MPEG_VIDEO_DESCRIPTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR))
+typedef struct _MXFMetadataMPEGVideoDescriptor MXFMetadataMPEGVideoDescriptor;
+typedef MXFMetadataBaseClass MXFMetadataMPEGVideoDescriptorClass;
+GType mxf_metadata_mpeg_video_descriptor_get_type (void);
+
+struct _MXFMetadataMPEGVideoDescriptor
+{
+  MXFMetadataCDCIPictureEssenceDescriptor parent;
+
+  gboolean single_sequence;
+  gboolean const_b_frames;
+  guint8 coded_content_type;
+  gboolean low_delay;
+
+  gboolean closed_gop;
+  gboolean identical_gop;
+  guint16 max_gop;
+
+  guint16 b_picture_count;
+  guint32 bitrate;
+  guint8 profile_and_level;
+};
+
 G_DEFINE_TYPE (MXFMetadataMPEGVideoDescriptor,
     mxf_metadata_mpeg_video_descriptor,
     MXF_TYPE_METADATA_CDCI_PICTURE_ESSENCE_DESCRIPTOR);
@@ -195,18 +224,18 @@ static void
       mxf_metadata_mpeg_video_descriptor_handle_tag;
 }
 
-gboolean
-mxf_is_mpeg_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_mpeg_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL)
+  if (track->parent.descriptor == NULL)
     return FALSE;
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -226,9 +255,9 @@ mxf_is_mpeg_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_mpeg_video_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps, MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -244,9 +273,9 @@ mxf_mpeg_video_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 
 static GstFlowReturn
 mxf_mpeg_audio_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps, MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   *outbuf = buffer;
 
@@ -300,9 +329,8 @@ static const MXFUL sound_essence_compression_dts = { {
 };
 
 static GstCaps *
-mxf_mpeg_es_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data,
+mxf_mpeg_es_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data,
     MXFMetadataGenericPictureEssenceDescriptor * p,
     MXFMetadataGenericSoundEssenceDescriptor * s)
 {
@@ -430,10 +458,9 @@ mxf_mpeg_es_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
-GstCaps *
-mxf_mpeg_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_mpeg_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataFileDescriptor *f = NULL;
   MXFMetadataGenericPictureEssenceDescriptor *p = NULL;
@@ -441,27 +468,28 @@ mxf_mpeg_create_caps (MXFMetadataGenericPackage * package,
   guint i;
   GstCaps *caps = NULL;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
     if (MXF_IS_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (track->
-            descriptor[i])) {
-      f = track->descriptor[i];
-      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->descriptor[i];
+            parent.descriptor[i])) {
+      f = track->parent.descriptor[i];
+      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
       break;
     } else if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->
-            descriptor[i])) {
-      f = track->descriptor[i];
-      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
+            parent.descriptor[i])) {
+      f = track->parent.descriptor[i];
+      s = (MXFMetadataGenericSoundEssenceDescriptor *) track->parent.
+          descriptor[i];
       break;
     }
   }
@@ -475,9 +503,7 @@ mxf_mpeg_create_caps (MXFMetadataGenericPackage * package,
   if (f->essence_container.u[13] == 0x04) {
     GST_DEBUG ("Found MPEG ES stream");
 
-    caps =
-        mxf_mpeg_es_create_caps (package, track, tags, handler, mapping_data, p,
-        s);
+    caps = mxf_mpeg_es_create_caps (track, tags, handler, mapping_data, p, s);
   } else if (f->essence_container.u[13] == 0x07) {
     GST_ERROR ("MPEG PES streams not supported yet");
     return NULL;
@@ -507,8 +533,14 @@ mxf_mpeg_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
+static const MXFEssenceElementHandler mxf_mpeg_essence_element_handler = {
+  mxf_is_mpeg_essence_track,
+  mxf_mpeg_create_caps
+};
+
 void
 mxf_mpeg_init (void)
 {
   mxf_metadata_register (0x0151, MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR);
+  mxf_essence_element_handler_register (&mxf_mpeg_essence_element_handler);
 }
diff --git a/gst/mxf/mxfmpeg.h b/gst/mxf/mxfmpeg.h
index 6ab45e42..07e7ddaa 100644
--- a/gst/mxf/mxfmpeg.h
+++ b/gst/mxf/mxfmpeg.h
@@ -29,39 +29,6 @@
 #include "mxfparse.h"
 #include "mxfmetadata.h"
 
-/* SMPTE 381M 8.1 */
-#define MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR \
-  (mxf_metadata_mpeg_video_descriptor_get_type())
-#define MXF_METADATA_MPEG_VIDEO_DESCRIPTOR(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST((obj),MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR, MXFMetadataMPEGVideoDescriptor))
-#define MXF_IS_METADATA_MPEG_VIDEO_DESCRIPTOR(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE((obj),MXF_TYPE_METADATA_MPEG_VIDEO_DESCRIPTOR))
-typedef struct _MXFMetadataMPEGVideoDescriptor MXFMetadataMPEGVideoDescriptor;
-typedef MXFMetadataBaseClass MXFMetadataMPEGVideoDescriptorClass;
-GType mxf_metadata_mpeg_video_descriptor_get_type (void);
-
-struct _MXFMetadataMPEGVideoDescriptor {
-  MXFMetadataCDCIPictureEssenceDescriptor parent;
-
-  gboolean single_sequence;
-  gboolean const_b_frames;
-  guint8 coded_content_type;
-  gboolean low_delay;
-
-  gboolean closed_gop;
-  gboolean identical_gop;
-  guint16 max_gop;
-
-  guint16 b_picture_count;
-  guint32 bitrate;
-  guint8 profile_and_level;
-};
-
-gboolean mxf_is_mpeg_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_mpeg_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_mpeg_init (void);
 
 #endif /* __MXF_MPEG_H__ */
diff --git a/gst/mxf/mxfparse.c b/gst/mxf/mxfparse.c
index 571f6f20..1fc59ba3 100644
--- a/gst/mxf/mxfparse.c
+++ b/gst/mxf/mxfparse.c
@@ -1015,3 +1015,30 @@ mxf_local_tag_add_to_hash_table (const MXFPrimerPack * primer,
 
   return TRUE;
 }
+
+static GSList *_mxf_essence_element_handler_registry = NULL;
+
+void
+mxf_essence_element_handler_register (const MXFEssenceElementHandler * handler)
+{
+  _mxf_essence_element_handler_registry =
+      g_slist_prepend (_mxf_essence_element_handler_registry,
+      (gpointer) handler);
+}
+
+const MXFEssenceElementHandler *
+mxf_essence_element_handler_find (const MXFMetadataTimelineTrack * track)
+{
+  GSList *l;
+  const MXFEssenceElementHandler *ret = NULL;
+
+  for (l = _mxf_essence_element_handler_registry; l; l = l->next) {
+    MXFEssenceElementHandler *current = l->data;
+
+    if (current->handles_track (track)) {
+      ret = current;
+    }
+  }
+
+  return ret;
+}
diff --git a/gst/mxf/mxfparse.h b/gst/mxf/mxfparse.h
index 3e68f676..831dabce 100644
--- a/gst/mxf/mxfparse.h
+++ b/gst/mxf/mxfparse.h
@@ -27,7 +27,12 @@
 #include "mxftypes.h"
 #include "mxfmetadata.h"
 
-typedef GstFlowReturn (*MXFEssenceElementHandler) (const MXFUL *key, GstBuffer *buffer, GstCaps *caps, MXFMetadataGenericPackage *package, MXFMetadataTrack *track, MXFMetadataStructuralComponent *component, gpointer mapping_data, GstBuffer **outbuf);
+typedef GstFlowReturn (*MXFEssenceElementHandleFunc) (const MXFUL *key, GstBuffer *buffer, GstCaps *caps, MXFMetadataTimelineTrack *track, MXFMetadataStructuralComponent *component, gpointer mapping_data, GstBuffer **outbuf);
+
+typedef struct {
+  gboolean (*handles_track) (const MXFMetadataTimelineTrack *track);
+  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);
@@ -90,5 +95,8 @@ gboolean mxf_local_tag_add_to_hash_table (const MXFPrimerPack *primer,
   guint16 tag, const guint8 *tag_data, guint16 tag_size,
   GHashTable **hash_table);
 
+void mxf_essence_element_handler_register (const MXFEssenceElementHandler *handler);
+const MXFEssenceElementHandler * mxf_essence_element_handler_find (const MXFMetadataTimelineTrack *track);
+
 #endif /* __MXF_PARSE_H__ */
 
diff --git a/gst/mxf/mxfup.c b/gst/mxf/mxfup.c
index 38270428..c18a481f 100644
--- a/gst/mxf/mxfup.c
+++ b/gst/mxf/mxfup.c
@@ -49,18 +49,18 @@ typedef struct
   guint32 image_end_offset;
 } MXFUPMappingData;
 
-gboolean
-mxf_is_up_essence_track (const MXFMetadataTrack * track)
+static gboolean
+mxf_is_up_essence_track (const MXFMetadataTimelineTrack * track)
 {
   guint i;
 
   g_return_val_if_fail (track != NULL, FALSE);
 
-  if (track->descriptor == NULL)
+  if (track->parent.descriptor == NULL)
     return FALSE;
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    MXFMetadataFileDescriptor *d = track->descriptor[i];
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
     MXFUL *key;
 
     if (!d)
@@ -78,9 +78,10 @@ mxf_is_up_essence_track (const MXFMetadataTrack * track)
 
 static GstFlowReturn
 mxf_up_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
-    GstCaps * caps, MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
-    gpointer mapping_data, GstBuffer ** outbuf)
+    GstCaps * caps,
+    MXFMetadataTimelineTrack * track,
+    MXFMetadataStructuralComponent * component, gpointer mapping_data,
+    GstBuffer ** outbuf)
 {
   MXFUPMappingData *data = mapping_data;
 
@@ -111,10 +112,9 @@ mxf_up_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
 }
 
 static GstCaps *
-mxf_up_rgba_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, MXFMetadataRGBAPictureEssenceDescriptor * d,
-    GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+mxf_up_rgba_create_caps (MXFMetadataTimelineTrack * track,
+    MXFMetadataRGBAPictureEssenceDescriptor * d, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   GstCaps *caps = NULL;
 
@@ -201,10 +201,9 @@ mxf_up_rgba_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
-GstCaps *
-mxf_up_create_caps (MXFMetadataGenericPackage * package,
-    MXFMetadataTrack * track, GstTagList ** tags,
-    MXFEssenceElementHandler * handler, gpointer * mapping_data)
+static GstCaps *
+mxf_up_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
 {
   MXFMetadataGenericPictureEssenceDescriptor *p = NULL;
   MXFMetadataCDCIPictureEssenceDescriptor *c = NULL;
@@ -212,26 +211,30 @@ mxf_up_create_caps (MXFMetadataGenericPackage * package,
   guint i;
   GstCaps *caps = NULL;
 
-  g_return_val_if_fail (package != NULL, NULL);
   g_return_val_if_fail (track != NULL, NULL);
 
-  if (track->descriptor == NULL) {
+  if (track->parent.descriptor == NULL) {
     GST_ERROR ("No descriptor found for this track");
     return NULL;
   }
 
-  for (i = 0; i < track->n_descriptor; i++) {
-    if (!track->descriptor[i])
+  for (i = 0; i < track->parent.n_descriptor; i++) {
+    if (!track->parent.descriptor[i])
       continue;
 
-    if (MXF_IS_METADATA_RGBA_PICTURE_ESSENCE_DESCRIPTOR (track->descriptor[i])) {
-      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->descriptor[i];
-      r = (MXFMetadataRGBAPictureEssenceDescriptor *) track->descriptor[i];
+    if (MXF_IS_METADATA_RGBA_PICTURE_ESSENCE_DESCRIPTOR (track->parent.
+            descriptor[i])) {
+      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
+      r = (MXFMetadataRGBAPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
       break;
     } else if (MXF_IS_METADATA_CDCI_PICTURE_ESSENCE_DESCRIPTOR (track->
-            descriptor[i])) {
-      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->descriptor[i];
-      c = (MXFMetadataCDCIPictureEssenceDescriptor *) track->descriptor[i];
+            parent.descriptor[i])) {
+      p = (MXFMetadataGenericPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
+      c = (MXFMetadataCDCIPictureEssenceDescriptor *) track->parent.
+          descriptor[i];
     }
   }
 
@@ -243,9 +246,7 @@ mxf_up_create_caps (MXFMetadataGenericPackage * package,
   *handler = mxf_up_handle_essence_element;
 
   if (r) {
-    caps =
-        mxf_up_rgba_create_caps (package, track, r, tags, handler,
-        mapping_data);
+    caps = mxf_up_rgba_create_caps (track, r, tags, handler, mapping_data);
   } else {
     GST_ERROR ("CDCI uncompressed picture essence not supported yet");
     return NULL;
@@ -258,7 +259,13 @@ mxf_up_create_caps (MXFMetadataGenericPackage * package,
   return caps;
 }
 
+static const MXFEssenceElementHandler mxf_up_essence_element_handler = {
+  mxf_is_up_essence_track,
+  mxf_up_create_caps
+};
+
 void
 mxf_up_init (void)
 {
+  mxf_essence_element_handler_register (&mxf_up_essence_element_handler);
 }
diff --git a/gst/mxf/mxfup.h b/gst/mxf/mxfup.h
index b575811a..42872e2d 100644
--- a/gst/mxf/mxfup.h
+++ b/gst/mxf/mxfup.h
@@ -28,11 +28,6 @@
 
 #include "mxfparse.h"
 
-gboolean mxf_is_up_essence_track (const MXFMetadataTrack *track);
-
-GstCaps *
-mxf_up_create_caps (MXFMetadataGenericPackage *package, MXFMetadataTrack *track, GstTagList **tags, MXFEssenceElementHandler *handler, gpointer *mapping_data);
-
 void mxf_up_init (void);
 
 #endif /* __MXF_UP_H__ */