From 9e6654352e1e92664efad60f9a951cc2dd3c2a8a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <slomo@circular-chaos.org>
Date: Thu, 27 Nov 2008 10:09:53 +0000
Subject: gst/mxf/: Add fundamental support for DV-DIF essence streams.

Original commit message from CVS:
* gst/mxf/Makefile.am:
* gst/mxf/mxfdemux.c:
(gst_mxf_demux_handle_header_metadata_update_streams),
(gst_mxf_demux_handle_klv_packet):
* gst/mxf/mxfdv-dif.c: (mxf_is_dv_dif_essence_track),
(mxf_dv_dif_handle_essence_element), (mxf_dv_dif_create_caps):
* gst/mxf/mxfdv-dif.h:
* gst/mxf/mxfparse.c: (mxf_is_descriptive_metadata):
* gst/mxf/mxfparse.h:
Add fundamental support for DV-DIF essence streams.
Handle descriptive metadata packets as metadata packets.
---
 gst/mxf/mxfdv-dif.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 gst/mxf/mxfdv-dif.c

(limited to 'gst/mxf/mxfdv-dif.c')

diff --git a/gst/mxf/mxfdv-dif.c b/gst/mxf/mxfdv-dif.c
new file mode 100644
index 00000000..71268ff1
--- /dev/null
+++ b/gst/mxf/mxfdv-dif.c
@@ -0,0 +1,122 @@
+/* GStreamer
+ * Copyright (C) 2008 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.
+ */
+
+/* Implementation of SMPTE 383M - Mapping DV-DIF data into the MXF
+ * Generic Container
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <string.h>
+
+#include "mxfdv-dif.h"
+
+GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
+#define GST_CAT_DEFAULT mxf_debug
+
+gboolean
+mxf_is_dv_dif_essence_track (const MXFMetadataTrack * track)
+{
+  guint i;
+
+  g_return_val_if_fail (track != NULL, FALSE);
+
+  if (track->descriptor == NULL)
+    return FALSE;
+
+  for (i = 0; i < track->n_descriptor; i++) {
+    MXFMetadataFileDescriptor *d = track->descriptor[i];
+    MXFUL *key = &d->essence_container;
+    /* SMPTE 383M 8 */
+    if (mxf_is_generic_container_essence_container_label (key) &&
+        key->u[12] == 0x02 && key->u[13] == 0x02)
+      return TRUE;
+  }
+
+  return FALSE;
+}
+
+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)
+{
+  *outbuf = buffer;
+
+  /* SMPTE 383 6.1.1 */
+  if (key->u[12] != 0x18 || (key->u[14] != 0x01 && key->u[14] != 0x02)) {
+    GST_ERROR ("Invalid DV-DIF essence element");
+    return GST_FLOW_ERROR;
+  }
+
+  return GST_FLOW_OK;
+}
+
+
+GstCaps *
+mxf_dv_dif_create_caps (MXFMetadataGenericPackage * package,
+    MXFMetadataTrack * track, GstTagList ** tags,
+    MXFEssenceElementHandler * 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) {
+    GST_ERROR ("No descriptor found for this track");
+    return NULL;
+  }
+
+  for (i = 0; i < track->n_descriptor; i++) {
+    if (((MXFMetadataGenericDescriptor *) track->descriptor[i])->
+        is_file_descriptor
+        && ((MXFMetadataGenericDescriptor *) track->descriptor[i])->type !=
+        MXF_METADATA_MULTIPLE_DESCRIPTOR) {
+      f = track->descriptor[i];
+    }
+  }
+
+  if (!f) {
+    GST_ERROR ("No descriptor found for this track");
+    return NULL;
+  }
+
+  *handler = mxf_dv_dif_handle_essence_element;
+  /* SMPTE 383M 8 */
+
+  /* TODO: might be video or audio only, use values of the generic sound/picture
+   * descriptor in the caps in that case
+   * Also dvdemux might not forward timestamps
+   */
+  if (f->essence_container.u[13] == 0x02) {
+    GST_DEBUG ("Found DV-DIF stream");
+    caps =
+        gst_caps_new_simple ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, TRUE,
+        NULL);
+  }
+
+  return caps;
+}
-- 
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