gstreamer/gst/mxf/mxfvc3.c

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/* GStreamer
2009-01-22 10:43:56 +00:00
* Copyright (C) 2008-2009 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.
*/
/* Implementation of SMPTE S2019-4 - Mapping VC-3 coding units into the MXF
* Generic Container
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <string.h>
#include "mxfvc3.h"
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)
{
guint i;
g_return_val_if_fail (track != NULL, FALSE);
if (track->parent.descriptor == NULL)
return FALSE;
for (i = 0; i < track->parent.n_descriptor; i++) {
MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
MXFUL *key;
if (!d)
continue;
key = &d->essence_container;
/* 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)) {
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;
}
static GstFlowReturn
mxf_vc3_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
GstCaps * caps,
MXFMetadataTimelineTrack * track,
gpointer mapping_data, GstBuffer ** outbuf)
{
*outbuf = buffer;
/* SMPTE 2019-4 6.1 */
if (key->u[12] != 0x15 || (key->u[14] != 0x05 && key->u[14] != 0x06)) {
GST_ERROR ("Invalid VC-3 essence element");
return GST_FLOW_ERROR;
}
return GST_FLOW_OK;
}
static GstCaps *
mxf_vc3_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
{
MXFMetadataFileDescriptor *f = NULL;
MXFMetadataGenericPictureEssenceDescriptor *p = NULL;
guint i;
GstCaps *caps = NULL;
g_return_val_if_fail (track != NULL, NULL);
if (track->parent.descriptor == NULL) {
GST_ERROR ("No descriptor found for this track");
return NULL;
}
for (i = 0; i < track->parent.n_descriptor; i++) {
if (!track->parent.descriptor[i])
continue;
if (MXF_IS_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (track->
parent.descriptor[i])) {
p = (MXFMetadataGenericPictureEssenceDescriptor *) track->parent.
descriptor[i];
f = track->parent.descriptor[i];
break;
} 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];
}
}
if (!f) {
GST_ERROR ("No descriptor found for this track");
return NULL;
}
*handler = mxf_vc3_handle_essence_element;
caps = gst_caps_new_simple ("video/x-dnxhd", NULL);
if (p) {
mxf_metadata_generic_picture_essence_descriptor_set_caps (p, caps);
} else {
GST_WARNING ("Only a generic file descriptor found");
}
if (!*tags)
*tags = gst_tag_list_new ();
gst_tag_list_add (*tags, GST_TAG_MERGE_APPEND, GST_TAG_VIDEO_CODEC,
"VC-3 Video", NULL);
return caps;
}
static const MXFEssenceElementHandler mxf_vc3_essence_element_handler = {
mxf_is_vc3_essence_track,
mxf_vc3_create_caps
};
void
mxf_vc3_init (void)
{
mxf_essence_element_handler_register (&mxf_vc3_essence_element_handler);
}