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91b35975b5
Generate an index table for essence streams during playback and make sure that only the correct essence elements are used for played tracks. Make it possible to have one essence stream used in multiple playback tracks. Fix some minor bugs.
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/* GStreamer
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* Copyright (C) 2008-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* Implementation of SMPTE 383M - Mapping DV-DIF data into the MXF
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* Generic Container
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*/
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/* TODO:
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* - playbin hangs on a lot of MXF/DV-DIF files (bug #563827)
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* - decodebin2 creates loops inside the linking graph (bug #563828)
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* - Forwarding of timestamps in dvdemux?
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <string.h>
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#include "mxfdv-dif.h"
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GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
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#define GST_CAT_DEFAULT mxf_debug
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static gboolean
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mxf_is_dv_dif_essence_track (const MXFMetadataTimelineTrack * track)
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{
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guint i;
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g_return_val_if_fail (track != NULL, FALSE);
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if (track->parent.descriptor == NULL)
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return FALSE;
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for (i = 0; i < track->parent.n_descriptor; i++) {
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MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
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MXFUL *key;
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if (!d)
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continue;
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key = &d->essence_container;
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/* SMPTE 383M 8 */
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if (mxf_is_generic_container_essence_container_label (key) &&
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key->u[12] == 0x02 && key->u[13] == 0x02)
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return TRUE;
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}
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return FALSE;
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}
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static GstFlowReturn
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mxf_dv_dif_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
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GstCaps * caps,
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MXFMetadataTimelineTrack * track,
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gpointer mapping_data, GstBuffer ** outbuf)
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{
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*outbuf = buffer;
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/* SMPTE 383 6.1.1 */
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if (key->u[12] != 0x18 || (key->u[14] != 0x01 && key->u[14] != 0x02)) {
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GST_ERROR ("Invalid DV-DIF essence element");
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return GST_FLOW_ERROR;
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}
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return GST_FLOW_OK;
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}
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static GstCaps *
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mxf_dv_dif_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
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MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
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{
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MXFMetadataFileDescriptor *f = NULL;
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guint i;
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GstCaps *caps = NULL;
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g_return_val_if_fail (track != NULL, NULL);
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if (track->parent.descriptor == NULL) {
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GST_ERROR ("No descriptor found for this track");
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return NULL;
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}
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for (i = 0; i < track->parent.n_descriptor; i++) {
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if (!track->parent.descriptor[i])
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continue;
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if (MXF_IS_METADATA_FILE_DESCRIPTOR (track->parent.descriptor[i]) &&
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!MXF_IS_METADATA_MULTIPLE_DESCRIPTOR (track->parent.descriptor[i])) {
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f = track->parent.descriptor[i];
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}
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}
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if (!f) {
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GST_ERROR ("No descriptor found for this track");
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return NULL;
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}
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*handler = mxf_dv_dif_handle_essence_element;
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/* SMPTE 383M 8 */
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/* TODO: might be video or audio only, use values of the generic sound/picture
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* descriptor in the caps in that case
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*/
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if (f->essence_container.u[13] == 0x02) {
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GST_DEBUG ("Found DV-DIF stream");
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caps =
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gst_caps_new_simple ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, TRUE,
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NULL);
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if (!*tags)
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*tags = gst_tag_list_new ();
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gst_tag_list_add (*tags, GST_TAG_MERGE_APPEND, GST_TAG_CODEC, "DV-DIF",
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NULL);
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}
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return caps;
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}
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static const MXFEssenceElementHandler mxf_dv_dif_essence_element_handler = {
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mxf_is_dv_dif_essence_track,
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mxf_dv_dif_create_caps
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};
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void
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mxf_dv_dif_init (void)
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{
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mxf_essence_element_handler_register (&mxf_dv_dif_essence_element_handler);
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}
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