mxfdemux: Add support for non-standard Avid MXF files containing DNxHD essence

Avid uses a custom essence container UL and custom essence element keys
that are fortunately compatible with the generic container essence
elements. Partially fixes bug #561922.

4 files changed, 36 insertions, 4 deletions

diff --git a/gst/mxf/mxfdemux.c b/gst/mxf/mxfdemux.c
index 32978dd2..1316c83d 100644
--- a/gst/mxf/mxfdemux.c
+++ b/gst/mxf/mxfdemux.c
@@ -2133,7 +2133,8 @@ next_try:
       gst_buffer_unref (buffer);
       buffer = NULL;
     } else if (mxf_is_generic_container_system_item (&key) ||
-        mxf_is_generic_container_essence_element (&key)) {
+        mxf_is_generic_container_essence_element (&key) ||
+        mxf_is_avid_essence_container_essence_element (&key)) {
       demux->offset += read;
       gst_buffer_unref (buffer);
       buffer = NULL;
@@ -2183,7 +2184,8 @@ gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key,
           demux->run_in + demux->current_partition->primer.offset +
           demux->current_partition->partition.header_byte_count ||
           mxf_is_generic_container_system_item (key) ||
-          mxf_is_generic_container_essence_element (key))) {
+          mxf_is_generic_container_essence_element (key) ||
+          mxf_is_avid_essence_container_essence_element (key))) {
     demux->current_partition->parsed_metadata = TRUE;
     if ((ret = gst_mxf_demux_resolve_references (demux)) != GST_FLOW_OK ||
         (ret = gst_mxf_demux_update_tracks (demux)) != GST_FLOW_OK) {
@@ -2234,7 +2236,8 @@ gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key,
   } else if (mxf_is_generic_container_system_item (key)) {
     ret =
         gst_mxf_demux_handle_generic_container_system_item (demux, key, buffer);
-  } else if (mxf_is_generic_container_essence_element (key)) {
+  } else if (mxf_is_generic_container_essence_element (key) ||
+      mxf_is_avid_essence_container_essence_element (key)) {
     ret =
         gst_mxf_demux_handle_generic_container_essence_element (demux, key,
         buffer, peek);
diff --git a/gst/mxf/mxfparse.c b/gst/mxf/mxfparse.c
index 70b98c85..c5c81fdb 100644
--- a/gst/mxf/mxfparse.c
+++ b/gst/mxf/mxfparse.c
@@ -215,6 +215,18 @@ mxf_is_avid_essence_container_label (const MXFUL * key)
   return (memcmp (&key->u, avid_essence_container_label, 16) == 0);
 }
 
+/* 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)
 {
diff --git a/gst/mxf/mxfparse.h b/gst/mxf/mxfparse.h
index b4e4cc26..eb29d205 100644
--- a/gst/mxf/mxfparse.h
+++ b/gst/mxf/mxfparse.h
@@ -61,6 +61,7 @@ gboolean mxf_is_index_table_segment (const MXFUL *key);
 
 gboolean mxf_is_generic_container_system_item (const MXFUL *key);
 gboolean mxf_is_generic_container_essence_element (const MXFUL *key);
+gboolean mxf_is_avid_essence_container_essence_element (const MXFUL * key);
 
 gboolean mxf_is_generic_container_essence_container_label (const MXFUL *key);
 gboolean mxf_is_avid_essence_container_label (const MXFUL *key);
diff --git a/gst/mxf/mxfvc3.c b/gst/mxf/mxfvc3.c
index 497355ef..e0f9b804 100644
--- a/gst/mxf/mxfvc3.c
+++ b/gst/mxf/mxfvc3.c
@@ -33,6 +33,11 @@
 GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
 #define GST_CAT_DEFAULT mxf_debug
 
+static const guint8 picture_essence_coding_vc3_avid[] = {
+  0x06, 0x0e, 0x2b, 0x34, 0x04, 0x01, 0x01, 0x01, 0x0e, 0x04, 0x02, 0x01, 0x02,
+  0x04, 0x01, 0x00
+};
+
 static gboolean
 mxf_is_vc3_essence_track (const MXFMetadataTimelineTrack * track)
 {
@@ -54,8 +59,19 @@ mxf_is_vc3_essence_track (const MXFMetadataTimelineTrack * track)
     /* SMPTE S2019-4 7 */
     if (mxf_is_generic_container_essence_container_label (key) &&
         key->u[12] == 0x02 && key->u[13] == 0x11 &&
-        (key->u[14] == 0x01 || key->u[14] == 0x02))
+        (key->u[14] == 0x01 || key->u[14] == 0x02)) {
       return TRUE;
+    } else if (mxf_is_avid_essence_container_label (key)) {
+      MXFMetadataGenericPictureEssenceDescriptor *p;
+
+      if (!MXF_IS_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (d))
+        return FALSE;
+      p = MXF_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (d);
+
+      key = &p->picture_essence_coding;
+      if (memcmp (key, picture_essence_coding_vc3_avid, 16) == 0)
+        return TRUE;
+    }
   }
 
   return FALSE;