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gstreamer/gst/mxf/mxfdemux.c
Sebastian Dröge 7dad262671 gst/mxf/: "Generation UID" and "This Generation UID" are different so handle them different. Also both are not part o... 
Original commit message from CVS:
* gst/mxf/Makefile.am:
* gst/mxf/mxfdemux.c:
* gst/mxf/mxfmetadata.c: (mxf_metadata_handle_tag),
(mxf_metadata_preface_handle_tag),
(mxf_metadata_identification_handle_tag),
(mxf_metadata_content_storage_handle_tag),
(mxf_metadata_essence_container_data_handle_tag),
(mxf_metadata_generic_package_handle_tag),
(mxf_metadata_track_handle_tag),
(mxf_metadata_sequence_handle_tag),
(mxf_metadata_structural_component_handle_tag),
(mxf_metadata_generic_descriptor_handle_tag),
(mxf_metadata_locator_handle_tag),
(mxf_metadata_locator_class_init):
* gst/mxf/mxfmetadata.h:
"Generation UID" and "This Generation UID" are different so handle
them different. Also both are not part of every metadata type.
2009-01-05 13:41:07 +00:00

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/* 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.
*/
/**
* SECTION:element-mxfdemux
*
* mxfdemux demuxes an MXF file into the different contained streams.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v filesrc location=/path/to/mxf ! mxfdemux ! audioconvert ! autoaudiosink
* ]| This pipeline demuxes an MXF file and outputs one of the contained raw audio streams.
* </refsect2>
*/
/* TODO:
* - Implement support for DMS-1 and descriptive metadata tracks
* - Differentiate UL and UUIDs, the former can define an object system
* (i.e. mxf_ul_is_a() and friends could be implemented), see SMPTE S336M.
* The latter are just 16 byte unique identifiers
* - Check everything for correctness vs. SMPTE S336M, some things can probably
* be generalized/simplified
* - Seeking support: IndexTableSegments and skip-to-position seeks, needs correct
* timestamp calculation, etc.
* - Handle timecode tracks correctly (where is this documented?)
* - Handle Generic container system items
* - 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.
* - Implement correct support for clip-wrapped essence elements.
* - Add a "tracks" property to select the tracks that should be used from the
* selected package.
* - Post structural metadata and descriptive metadata trees as a message on the bus
* and send them downstream as event.
* - Multichannel audio needs channel layouts, define them (SMPTE S320M?).
* - Correctly handle the different rectangles and aspect-ratio for video
* - Add support for non-standard MXF used by Avid (bug #561922).
* - Fix frame layout stuff, i.e. interlaced/progressive
*
* - Implement SMPTE D11 essence and the digital cinema/MXF specs
*
* - Implement a muxer ;-)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mxfdemux.h"
#include "mxfparse.h"
#include "mxfmetadata.h"
#include <string.h>
static GstStaticPadTemplate mxf_sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/mxf")
);
static GstStaticPadTemplate mxf_src_template =
GST_STATIC_PAD_TEMPLATE ("track_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (mxfdemux_debug);
#define GST_CAT_DEFAULT mxfdemux_debug
#define GST_TYPE_MXF_DEMUX_PAD (gst_mxf_demux_pad_get_type())
#define GST_MXF_DEMUX_PAD(pad) (G_TYPE_CHECK_INSTANCE_CAST((pad),GST_TYPE_MXF_DEMUX_PAD,GstMXFDemuxPad))
#define GST_MXF_DEMUX_PAD_CAST(pad) ((GstMXFDemuxPad *) pad)
#define GST_IS_MXF_DEMUX_PAD(pad) (G_TYPE_CHECK_INSTANCE_TYPE((pad),GST_TYPE_MXF_DEMUX_PAD))
typedef struct
{
GstPad parent;
guint32 track_id;
gboolean need_segment;
GstClockTime last_stop;
GstFlowReturn last_flow;
gboolean eos, discont;
gpointer mapping_data;
const MXFEssenceElementHandler *handler;
MXFEssenceElementHandleFunc handle_func;
GstTagList *tags;
MXFMetadataGenericPackage *material_package;
MXFMetadataTimelineTrack *material_track;
MXFMetadataSourceClip *component;
guint current_component;
gint64 current_component_position;
gint64 current_component_drop;
MXFMetadataSourcePackage *source_package;
MXFMetadataTimelineTrack *source_track;
GstCaps *caps;
} GstMXFDemuxPad;
typedef struct
{
GstPadClass parent;
} GstMXFDemuxPadClass;
G_DEFINE_TYPE (GstMXFDemuxPad, gst_mxf_demux_pad, GST_TYPE_PAD);
static void
gst_mxf_demux_pad_finalize (GObject * object)
{
GstMXFDemuxPad *pad = GST_MXF_DEMUX_PAD (object);
gst_caps_replace (&pad->caps, NULL);
g_free (pad->mapping_data);
pad->mapping_data = NULL;
if (pad->tags) {
gst_tag_list_free (pad->tags);
pad->tags = NULL;
}
G_OBJECT_CLASS (gst_mxf_demux_pad_parent_class)->finalize (object);
}
static void
gst_mxf_demux_pad_class_init (GstMXFDemuxPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->finalize = gst_mxf_demux_pad_finalize;
}
static void
gst_mxf_demux_pad_init (GstMXFDemuxPad * pad)
{
pad->last_flow = GST_FLOW_OK;
pad->last_stop = 0;
}
enum
{
PROP_0,
PROP_PACKAGE
};
static gboolean gst_mxf_demux_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_mxf_demux_src_event (GstPad * pad, GstEvent * event);
static const GstQueryType *gst_mxf_demux_src_query_type (GstPad * pad);
static gboolean gst_mxf_demux_src_query (GstPad * pad, GstQuery * query);
GST_BOILERPLATE (GstMXFDemux, gst_mxf_demux, GstElement, GST_TYPE_ELEMENT);
static void
gst_mxf_demux_flush (GstMXFDemux * demux, gboolean discont)
{
GST_DEBUG_OBJECT (demux, "flushing queued data in the MXF demuxer");
gst_adapter_clear (demux->adapter);
demux->flushing = FALSE;
/* Only in push mode */
if (!demux->random_access) {
/* We reset the offset and will get one from first push */
demux->offset = 0;
}
}
static void
gst_mxf_demux_remove_pad (GstMXFDemuxPad * pad, GstMXFDemux * demux)
{
gst_element_remove_pad (GST_ELEMENT (demux), GST_PAD (pad));
}
static void
gst_mxf_demux_remove_pads (GstMXFDemux * demux)
{
if (demux->src) {
g_ptr_array_foreach (demux->src, (GFunc) gst_mxf_demux_remove_pad, demux);
g_ptr_array_foreach (demux->src, (GFunc) gst_object_unref, NULL);
g_ptr_array_free (demux->src, TRUE);
demux->src = NULL;
}
}
static void
gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux)
{
GST_DEBUG_OBJECT (demux, "Resetting MXF state");
mxf_partition_pack_reset (&demux->partition);
mxf_primer_pack_reset (&demux->primer);
}
static void
gst_mxf_demux_reset_metadata (GstMXFDemux * demux)
{
guint i;
GST_DEBUG_OBJECT (demux, "Resetting metadata");
demux->update_metadata = TRUE;
demux->metadata_resolved = FALSE;
demux->current_package = NULL;
if (demux->src) {
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;
pad->source_track = NULL;
pad->source_package = NULL;
}
}
demux->preface = NULL;
if (demux->metadata) {
guint i;
for (i = 0; i < demux->metadata->len; i++) {
GstMiniObject *o = g_ptr_array_index (demux->metadata, i);
if (o)
gst_mini_object_unref (o);
}
g_ptr_array_free (demux->metadata, TRUE);
demux->metadata = NULL;
}
}
static void
gst_mxf_demux_reset (GstMXFDemux * demux)
{
GST_DEBUG_OBJECT (demux, "cleaning up MXF demuxer");
demux->flushing = FALSE;
demux->header_partition_pack_offset = 0;
demux->footer_partition_pack_offset = 0;
demux->offset = 0;
demux->pull_footer_metadata = TRUE;
demux->run_in = -1;
memset (&demux->current_package_uid, 0, sizeof (MXFUMID));
if (demux->new_seg_event) {
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
if (demux->close_seg_event) {
gst_event_unref (demux->close_seg_event);
demux->close_seg_event = NULL;
}
gst_adapter_clear (demux->adapter);
gst_mxf_demux_remove_pads (demux);
if (demux->partition_index) {
g_array_free (demux->partition_index, TRUE);
demux->partition_index = NULL;
}
if (demux->index_table) {
guint i;
for (i = 0; i < demux->index_table->len; i++)
mxf_index_table_segment_reset (&g_array_index (demux->index_table,
MXFIndexTableSegment, i));
g_array_free (demux->index_table, TRUE);
demux->index_table = NULL;
}
gst_mxf_demux_reset_mxf_state (demux);
gst_mxf_demux_reset_metadata (demux);
}
static GstFlowReturn
gst_mxf_demux_combine_flows (GstMXFDemux * demux,
GstMXFDemuxPad * pad, GstFlowReturn ret)
{
guint i;
/* store the value */
pad->last_flow = ret;
/* any other error that is not-linked can be returned right away */
if (ret != GST_FLOW_NOT_LINKED)
goto done;
/* only return NOT_LINKED if all other pads returned NOT_LINKED */
g_assert (demux->src->len != 0);
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *opad = g_ptr_array_index (demux->src, i);
if (opad == NULL)
continue;
ret = opad->last_flow;
/* some other return value (must be SUCCESS but we can return
* other values as well) */
if (ret != GST_FLOW_NOT_LINKED)
goto done;
}
/* if we get here, all other pads were unlinked and we return
* NOT_LINKED then */
done:
GST_LOG_OBJECT (demux, "combined return %s", gst_flow_get_name (ret));
return ret;
}
static GstFlowReturn
gst_mxf_demux_pull_range (GstMXFDemux * demux, guint64 offset,
guint size, GstBuffer ** buffer)
{
GstFlowReturn ret;
ret = gst_pad_pull_range (demux->sinkpad, offset, size, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
GST_WARNING_OBJECT (demux,
"failed when pulling %u bytes from offset %" G_GUINT64_FORMAT ": %s",
size, offset, gst_flow_get_name (ret));
*buffer = NULL;
return ret;
}
if (G_UNLIKELY (*buffer && GST_BUFFER_SIZE (*buffer) != size)) {
GST_WARNING_OBJECT (demux,
"partial pull got %u when expecting %u from offset %" G_GUINT64_FORMAT,
GST_BUFFER_SIZE (*buffer), size, offset);
gst_buffer_unref (*buffer);
ret = GST_FLOW_UNEXPECTED;
*buffer = NULL;
return ret;
}
return ret;
}
static gboolean
gst_mxf_demux_push_src_event (GstMXFDemux * demux, GstEvent * event)
{
gboolean ret = TRUE;
guint i;
GST_DEBUG_OBJECT (demux, "Pushing '%s' event downstream",
GST_EVENT_TYPE_NAME (event));
if (!demux->src)
return ret;
for (i = 0; i < demux->src->len; i++) {
GstPad *pad = GST_PAD (g_ptr_array_index (demux->src, i));
ret |= gst_pad_push_event (pad, gst_event_ref (event));
}
gst_event_unref (event);
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_partition_pack (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
if (demux->partition.valid) {
mxf_partition_pack_reset (&demux->partition);
mxf_primer_pack_reset (&demux->primer);
}
GST_DEBUG_OBJECT (demux,
"Handling partition pack of size %u at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
if (!mxf_partition_pack_parse (key, &demux->partition,
GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer))) {
GST_ERROR_OBJECT (demux, "Parsing partition pack failed");
return GST_FLOW_ERROR;
}
if (demux->partition.type == MXF_PARTITION_PACK_HEADER)
demux->footer_partition_pack_offset = demux->partition.footer_partition;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_primer_pack (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
GST_DEBUG_OBJECT (demux,
"Handling primer pack of size %u at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
if (G_UNLIKELY (!demux->partition.valid)) {
GST_ERROR_OBJECT (demux, "Primer pack before partition pack");
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (demux->primer.valid)) {
GST_ERROR_OBJECT (demux, "Primer pack already exists");
return GST_FLOW_OK;
}
if (!mxf_primer_pack_parse (key, &demux->primer,
GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer))) {
GST_ERROR_OBJECT (demux, "Parsing primer pack failed");
return GST_FLOW_ERROR;
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_header_metadata_resolve_references (GstMXFDemux * demux)
{
guint i;
GstFlowReturn ret = GST_FLOW_OK;
GST_DEBUG_OBJECT (demux, "Resolve metadata references");
demux->update_metadata = FALSE;
if (!demux->metadata) {
GST_ERROR_OBJECT (demux, "No metadata yet");
return GST_FLOW_ERROR;
}
/* Append NULL terminator */
g_ptr_array_add (demux->metadata, NULL);
for (i = 0; i < demux->metadata->len - 1; i++) {
MXFMetadataBase *m =
MXF_METADATA_BASE (g_ptr_array_index (demux->metadata, i));
gboolean resolved;
resolved =
mxf_metadata_base_resolve (m,
(MXFMetadataBase **) demux->metadata->pdata);
/* Resolving can fail for anything but the preface, as the preface
* will resolve everything required */
if (!resolved && MXF_IS_METADATA_PREFACE (m)) {
ret = GST_FLOW_ERROR;
goto error;
}
}
demux->metadata_resolved = TRUE;
return ret;
error:
demux->metadata_resolved = FALSE;
return ret;
}
static MXFMetadataGenericPackage *
gst_mxf_demux_find_package (GstMXFDemux * demux, const MXFUMID * umid)
{
MXFMetadataGenericPackage *ret = NULL;
guint i;
if (demux->preface->content_storage
&& demux->preface->content_storage->packages) {
for (i = 0; i < demux->preface->content_storage->n_packages; i++) {
MXFMetadataGenericPackage *p =
demux->preface->content_storage->packages[i];
if (!p)
continue;
if (mxf_umid_is_equal (&p->package_uid, umid)) {
ret = p;
break;
}
}
}
return ret;
}
static MXFMetadataGenericPackage *
gst_mxf_demux_choose_package (GstMXFDemux * demux)
{
MXFMetadataGenericPackage *ret = NULL;
guint i;
if (demux->requested_package_string) {
MXFUMID umid;
if (!mxf_umid_from_string (demux->requested_package_string, &umid)) {
GST_ERROR_OBJECT (demux, "Invalid requested package");
} else {
if (memcmp (&umid, &demux->current_package_uid, 32) != 0) {
gst_mxf_demux_remove_pads (demux);
memcpy (&demux->current_package_uid, &umid, 32);
}
}
g_free (demux->requested_package_string);
demux->requested_package_string = NULL;
}
if (!mxf_umid_is_zero (&demux->current_package_uid))
ret = gst_mxf_demux_find_package (demux, &demux->current_package_uid);
if (ret && (MXF_IS_METADATA_MATERIAL_PACKAGE (ret)
|| (MXF_IS_METADATA_SOURCE_PACKAGE (ret)
&& MXF_METADATA_SOURCE_PACKAGE (ret)->top_level)))
return ret;
else if (ret)
GST_WARNING_OBJECT (demux,
"Current package is not a material package or top-level source package, choosing the first best");
else if (!mxf_umid_is_zero (&demux->current_package_uid))
GST_WARNING_OBJECT (demux,
"Current package not found, choosing the first best");
if (demux->preface->primary_package)
ret = demux->preface->primary_package;
if (ret && (MXF_IS_METADATA_MATERIAL_PACKAGE (ret)
|| (MXF_IS_METADATA_SOURCE_PACKAGE (ret)
&& MXF_METADATA_SOURCE_PACKAGE (ret)->top_level)))
return ret;
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])) {
ret =
MXF_METADATA_GENERIC_PACKAGE (demux->preface->content_storage->
packages[i]);
break;
}
}
if (!ret) {
GST_ERROR_OBJECT (demux, "No material package");
return NULL;
}
memcpy (&demux->current_package_uid, &ret->package_uid, 32);
if (!ret)
GST_ERROR_OBJECT (demux, "No suitable package found");
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_header_metadata_update_streams (GstMXFDemux * demux)
{
MXFMetadataGenericPackage *current_package = NULL;
guint i, j, k;
gboolean first_run;
guint component_index;
GST_DEBUG_OBJECT (demux, "Updating streams");
current_package = gst_mxf_demux_choose_package (demux);
if (!current_package) {
GST_ERROR_OBJECT (demux, "Unable to find current package");
return GST_FLOW_ERROR;
} else if (!current_package->tracks) {
GST_ERROR_OBJECT (demux, "Current package has no (resolved) tracks");
return GST_FLOW_ERROR;
} else if (!current_package->n_essence_tracks) {
GST_ERROR_OBJECT (demux, "Current package has no essence tracks");
return GST_FLOW_ERROR;
}
first_run = (demux->src == NULL);
demux->current_package = current_package;
for (i = 0; i < current_package->n_tracks; i++) {
MXFMetadataTimelineTrack *track = NULL;
MXFMetadataSequence *sequence;
MXFMetadataSourceClip *component = NULL;
MXFMetadataSourcePackage *source_package = NULL;
MXFMetadataTimelineTrack *source_track = NULL;
GstMXFDemuxPad *pad = NULL;
GstCaps *caps = NULL;
GST_DEBUG_OBJECT (demux, "Handling track %u", i);
if (!current_package->tracks[i]) {
GST_WARNING_OBJECT (demux, "Unresolved track");
continue;
}
if (!MXF_IS_METADATA_TIMELINE_TRACK (current_package->tracks[i])) {
GST_DEBUG_OBJECT (demux, "No timeline track");
continue;
}
track = MXF_METADATA_TIMELINE_TRACK (current_package->tracks[i]);
if (demux->src && demux->src->len > 0) {
/* Find pad from track_id */
for (j = 0; j < demux->src->len; j++) {
GstMXFDemuxPad *tmp = g_ptr_array_index (demux->src, j);
if (tmp->track_id == track->parent.track_id) {
pad = tmp;
break;
}
}
}
if (pad)
component_index = pad->current_component;
else
component_index = 0;
if (!track->parent.sequence) {
GST_WARNING_OBJECT (demux, "Track with no sequence");
continue;
}
sequence = track->parent.sequence;
if (MXF_IS_METADATA_SOURCE_PACKAGE (current_package)) {
GST_DEBUG_OBJECT (demux, "Playing source package");
component = NULL;
source_package = MXF_METADATA_SOURCE_PACKAGE (current_package);
source_track = track;
} else if (sequence->structural_components
&&
MXF_IS_METADATA_SOURCE_CLIP (sequence->structural_components
[component_index])) {
GST_DEBUG_OBJECT (demux, "Playing material package");
component =
MXF_METADATA_SOURCE_CLIP (sequence->structural_components
[component_index]);
if (component->source_package && component->source_package->top_level &&
MXF_METADATA_GENERIC_PACKAGE (component->source_package)->tracks) {
MXFMetadataGenericPackage *tmp_pkg =
MXF_METADATA_GENERIC_PACKAGE (component->source_package);
source_package = component->source_package;
for (k = 0; k < tmp_pkg->n_tracks; k++) {
MXFMetadataTrack *tmp = tmp_pkg->tracks[k];
if (tmp->track_id == component->source_track_id) {
source_track = MXF_METADATA_TIMELINE_TRACK (tmp);
break;
}
}
}
}
if (track->parent.type && (track->parent.type & 0xf0) != 0x30) {
GST_DEBUG_OBJECT (demux, "No essence track");
continue;
}
if (!source_package || track->parent.type == MXF_METADATA_TRACK_UNKNOWN
|| !source_track) {
GST_WARNING_OBJECT (demux,
"No source package or track type for track found");
continue;
}
if (track->edit_rate.n <= 0 || track->edit_rate.d <= 0 ||
source_track->edit_rate.n <= 0 || source_track->edit_rate.d <= 0) {
GST_WARNING_OBJECT (demux, "Track has an invalid edit rate");
continue;
}
if (MXF_IS_METADATA_MATERIAL_PACKAGE (current_package) && !component) {
GST_WARNING_OBJECT (demux,
"Playing material package but found no component for track");
continue;
}
if (!source_package->descriptors) {
GST_WARNING_OBJECT (demux, "Source package has no descriptors");
continue;
}
if (!source_track->parent.descriptor) {
GST_WARNING_OBJECT (demux, "No descriptor found for track");
continue;
}
if (!pad && first_run) {
GstPadTemplate *templ;
gchar *pad_name;
templ =
gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (demux),
"track_%u");
pad_name = g_strdup_printf ("track_%u", track->parent.track_id);
g_assert (templ != NULL);
/* Create pad */
pad = (GstMXFDemuxPad *) g_object_new (GST_TYPE_MXF_DEMUX_PAD,
"name", pad_name, "direction", GST_PAD_SRC, "template", templ, NULL);
pad->need_segment = TRUE;
pad->eos = FALSE;
g_free (pad_name);
}
if (!pad) {
GST_WARNING_OBJECT (demux,
"Not the first pad addition run, ignoring new track");
continue;
}
/* Update pad */
pad->track_id = track->parent.track_id;
pad->material_package = current_package;
pad->material_track = track;
/* If we just added the pad initialize for the current component */
if (first_run && MXF_IS_METADATA_MATERIAL_PACKAGE (current_package)) {
pad->current_component = 0;
pad->current_component_position = 0;
pad->current_component_drop = source_track->origin;
if (track->edit_rate.n != source_track->edit_rate.n ||
track->edit_rate.n != source_track->edit_rate.n) {
pad->current_component_drop +=
gst_util_uint64_scale (component->start_position,
source_track->edit_rate.n * track->edit_rate.d,
source_track->edit_rate.d * track->edit_rate.n);
} else {
pad->current_component_drop += component->start_position;
}
}
/* NULL iff playing a source package */
pad->component = component;
pad->source_package = source_package;
pad->source_track = source_track;
pad->handler = NULL;
g_free (pad->mapping_data);
pad->handle_func = NULL;
pad->mapping_data = NULL;
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);
continue;
}
GST_DEBUG_OBJECT (demux, "Created caps %" GST_PTR_FORMAT, caps);
if (pad->caps && !gst_caps_is_equal (pad->caps, caps)) {
gst_pad_set_caps (GST_PAD_CAST (pad), caps);
gst_caps_replace (&pad->caps, gst_caps_ref (caps));
} else if (!pad->caps) {
gst_pad_set_caps (GST_PAD_CAST (pad), caps);
pad->caps = gst_caps_ref (caps);
gst_pad_set_event_function (GST_PAD_CAST (pad),
GST_DEBUG_FUNCPTR (gst_mxf_demux_src_event));
gst_pad_set_query_type_function (GST_PAD_CAST (pad),
GST_DEBUG_FUNCPTR (gst_mxf_demux_src_query_type));
gst_pad_set_query_function (GST_PAD_CAST (pad),
GST_DEBUG_FUNCPTR (gst_mxf_demux_src_query));
gst_pad_use_fixed_caps (GST_PAD_CAST (pad));
gst_pad_set_active (GST_PAD_CAST (pad), TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (demux), gst_object_ref (pad));
if (!demux->src)
demux->src = g_ptr_array_new ();
g_ptr_array_add (demux->src, pad);
pad->discont = TRUE;
}
gst_caps_unref (caps);
}
gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_metadata (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
guint16 type;
MXFMetadata *metadata = NULL;
GstFlowReturn ret = GST_FLOW_OK;
type = GST_READ_UINT16_BE (key->u + 13);
GST_DEBUG_OBJECT (demux,
"Handling metadata of size %u at offset %"
G_GUINT64_FORMAT " of type 0x%04x", GST_BUFFER_SIZE (buffer),
demux->offset, type);
if (G_UNLIKELY (!demux->partition.valid)) {
GST_ERROR_OBJECT (demux, "Partition pack doesn't exist");
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (!demux->primer.valid)) {
GST_ERROR_OBJECT (demux, "Primer pack doesn't exists");
return GST_FLOW_ERROR;
}
metadata =
mxf_metadata_new (type, &demux->primer, GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer));
if (metadata && !MXF_IS_METADATA_PREFACE (metadata)
&& !demux->update_metadata) {
GST_DEBUG_OBJECT (demux,
"Skipping parsing of metadata because it's older than what we have");
gst_mini_object_unref ((GstMiniObject *) metadata);
return GST_FLOW_OK;
}
if (!metadata) {
GST_ERROR_OBJECT (demux, "Parsing metadata failed");
return GST_FLOW_ERROR;
}
if (MXF_IS_METADATA_PREFACE (metadata)) {
MXFMetadataPreface *preface = MXF_METADATA_PREFACE (metadata);
if (!demux->preface
|| (!mxf_timestamp_is_unknown (&preface->last_modified_date)
&& mxf_timestamp_compare (&demux->preface->last_modified_date,
&preface->last_modified_date) < 0)) {
GST_DEBUG_OBJECT (demux,
"Timestamp of new preface is newer than old, updating metadata");
gst_mxf_demux_reset_metadata (demux);
demux->preface = preface;
} else {
GST_DEBUG_OBJECT (demux, "Preface is older than already parsed preface");
gst_mini_object_unref ((GstMiniObject *) metadata);
return GST_FLOW_OK;
}
}
if (!demux->metadata)
demux->metadata = g_ptr_array_new ();
g_ptr_array_add (demux->metadata, metadata);
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_descriptive_metadata (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer)
{
guint32 type;
guint8 scheme;
GstFlowReturn ret = GST_FLOW_OK;
scheme = GST_READ_UINT8 (key->u + 12);
type = GST_READ_UINT24_BE (key->u + 13);
GST_DEBUG_OBJECT (demux,
"Handling descriptive metadata of size %u at offset %"
G_GUINT64_FORMAT " with scheme 0x%02x and type 0x%06x",
GST_BUFFER_SIZE (buffer), demux->offset, scheme, type);
if (G_UNLIKELY (!demux->partition.valid)) {
GST_ERROR_OBJECT (demux, "Partition pack doesn't exist");
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (!demux->primer.valid)) {
GST_ERROR_OBJECT (demux, "Primer pack doesn't exists");
return GST_FLOW_ERROR;
}
if (!demux->update_metadata) {
GST_DEBUG_OBJECT (demux,
"Skipping parsing of metadata because it's older than what we have");
return GST_FLOW_OK;
}
switch (type) {
default:
GST_WARNING_OBJECT (demux,
"Unknown or unhandled descriptive metadata of scheme 0x%02x and type 0x%06x",
scheme, type);
break;
}
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_generic_container_system_item (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer)
{
GST_DEBUG_OBJECT (demux,
"Handling generic container system item of size %u"
" at offset %" G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
/* TODO: parse this */
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_pad_next_component (GstMXFDemux * demux, GstMXFDemuxPad * pad)
{
MXFMetadataSequence *sequence;
guint k;
GstCaps *caps = NULL;
pad->current_component++;
sequence = pad->material_track->parent.sequence;
if (pad->current_component >= sequence->n_structural_components) {
GST_DEBUG_OBJECT (demux, "After last structural component");
return GST_FLOW_UNEXPECTED;
}
GST_DEBUG_OBJECT (demux, "Switching to component %u", pad->current_component);
pad->component =
MXF_METADATA_SOURCE_CLIP (sequence->structural_components[pad->
current_component]);
if (pad->component == NULL) {
GST_ERROR_OBJECT (demux, "No such structural component");
return GST_FLOW_ERROR;
}
if (!pad->component->source_package
|| !pad->component->source_package->top_level
|| !MXF_METADATA_GENERIC_PACKAGE (pad->component->
source_package)->tracks) {
GST_ERROR_OBJECT (demux, "Invalid component");
return GST_FLOW_ERROR;
}
pad->source_package = pad->component->source_package;
pad->source_track = NULL;
for (k = 0; k < pad->source_package->parent.n_tracks; k++) {
MXFMetadataTrack *tmp = pad->source_package->parent.tracks[k];
if (tmp->track_id == pad->component->source_track_id) {
pad->source_track = MXF_METADATA_TIMELINE_TRACK (tmp);
break;
}
}
if (!pad->source_track) {
GST_ERROR_OBJECT (demux, "No source track found");
return GST_FLOW_ERROR;
}
if (!pad->source_package->descriptors) {
GST_ERROR_OBJECT (demux, "Source package has no descriptors");
return GST_FLOW_ERROR;
}
if (!pad->source_track->parent.descriptor) {
GST_ERROR_OBJECT (demux, "No descriptor found for track");
return GST_FLOW_ERROR;
}
if (pad->source_track->edit_rate.n <= 0 ||
pad->source_track->edit_rate.d <= 0) {
GST_ERROR_OBJECT (demux, "Source track has invalid edit rate");
return GST_FLOW_ERROR;
}
pad->current_component_position = 0;
pad->current_component_drop = pad->source_track->origin;
if (pad->material_track->edit_rate.n != pad->source_track->edit_rate.n ||
pad->material_track->edit_rate.n != pad->source_track->edit_rate.n) {
pad->current_component_drop +=
gst_util_uint64_scale (pad->component->start_position,
pad->source_track->edit_rate.n * pad->material_track->edit_rate.d,
pad->source_track->edit_rate.d * pad->material_track->edit_rate.n);
} else {
pad->current_component_drop += pad->component->start_position;
}
pad->handler = NULL;
g_free (pad->mapping_data);
pad->handle_func = NULL;
pad->mapping_data = NULL;
pad->handler = mxf_essence_element_handler_find (pad->source_track);
if (!pad->handler) {
GST_ERROR_OBJECT (demux, "No essence element handler for track found");
return GST_FLOW_ERROR;
}
caps =
pad->handler->create_caps (pad->source_track, &pad->tags,
&pad->handle_func, &pad->mapping_data);
if (!caps) {
GST_ERROR_OBJECT (demux, "No caps created");
return GST_FLOW_ERROR;
}
GST_DEBUG_OBJECT (demux, "Created caps %" GST_PTR_FORMAT, caps);
if (!gst_caps_is_equal (pad->caps, caps)) {
gst_pad_set_caps (GST_PAD_CAST (pad), caps);
gst_caps_replace (&pad->caps, gst_caps_ref (caps));
}
gst_caps_unref (caps);
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
guint32 track_number;
guint i, j;
GstMXFDemuxPad *pad = NULL;
GstBuffer *inbuf;
GstBuffer *outbuf = NULL;
GST_DEBUG_OBJECT (demux,
"Handling generic container essence element of size %u"
" at offset %" G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
GST_DEBUG_OBJECT (demux, " type = 0x%02x", key->u[12]);
GST_DEBUG_OBJECT (demux, " essence element count = 0x%02x", key->u[13]);
GST_DEBUG_OBJECT (demux, " essence element type = 0x%02x", key->u[14]);
GST_DEBUG_OBJECT (demux, " essence element number = 0x%02x", key->u[15]);
if (!demux->current_package) {
GST_ERROR_OBJECT (demux, "No package selected yet");
return GST_FLOW_ERROR;
}
if (!demux->src || demux->src->len == 0) {
GST_ERROR_OBJECT (demux, "No streams created yet");
return GST_FLOW_ERROR;
}
if (GST_BUFFER_SIZE (buffer) == 0) {
GST_DEBUG_OBJECT (demux, "Zero sized essence element, ignoring");
return GST_FLOW_OK;
}
track_number = GST_READ_UINT32_BE (&key->u[12]);
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
MXFMetadataContentStorage *content_storage =
demux->preface->content_storage;
if (p->source_track->parent.track_number == track_number ||
(p->source_track->parent.track_number == 0 &&
demux->src->len == 1 &&
demux->current_package->n_essence_tracks == 1)) {
if (content_storage->essence_container_data) {
for (j = 0; j < content_storage->n_essence_container_data; j++) {
MXFMetadataEssenceContainerData *edata =
content_storage->essence_container_data[j];
if (edata && p->source_package == edata->linked_package
&& demux->partition.body_sid == edata->body_sid) {
pad = p;
break;
}
}
} else {
pad = p;
}
if (pad)
break;
}
}
if (!pad) {
GST_WARNING_OBJECT (demux, "No corresponding pad found");
return GST_FLOW_OK;
}
if (pad->component && pad->current_component_drop > 0) {
GST_DEBUG_OBJECT (demux, "Before component start, dropping");
pad->current_component_drop--;
return GST_FLOW_OK;
}
if (pad->need_segment) {
gst_pad_push_event (GST_PAD_CAST (pad),
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0));
pad->need_segment = FALSE;
}
if (pad->tags) {
gst_element_found_tags_for_pad (GST_ELEMENT_CAST (demux),
GST_PAD_CAST (pad), pad->tags);
pad->tags = NULL;
}
/* Create subbuffer to be able to change metadata */
inbuf = gst_buffer_create_sub (buffer, 0, GST_BUFFER_SIZE (buffer));
//FIXME broken!
GST_BUFFER_TIMESTAMP (inbuf) = pad->last_stop;
GST_BUFFER_DURATION (inbuf) =
gst_util_uint64_scale (GST_SECOND, pad->material_track->edit_rate.d,
pad->material_track->edit_rate.n);
GST_BUFFER_OFFSET (inbuf) = GST_BUFFER_OFFSET_NONE;
GST_BUFFER_OFFSET_END (inbuf) = GST_BUFFER_OFFSET_NONE;
gst_buffer_set_caps (inbuf, pad->caps);
if (pad->handle_func) {
/* Takes ownership of inbuf */
ret =
pad->handle_func (key, inbuf, pad->caps,
pad->source_track, pad->component, pad->mapping_data, &outbuf);
inbuf = NULL;
} else {
outbuf = inbuf;
inbuf = NULL;
ret = GST_FLOW_OK;
}
if (ret != GST_FLOW_OK) {
GST_ERROR_OBJECT (demux, "Failed to handle essence element");
if (outbuf) {
gst_buffer_unref (outbuf);
outbuf = NULL;
}
}
if (outbuf)
pad->last_stop += GST_BUFFER_DURATION (outbuf);
if (outbuf) {
/* TODO: handle timestamp gaps */
GST_DEBUG_OBJECT (demux,
"Pushing buffer of size %u for track %u: timestamp %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT, GST_BUFFER_SIZE (outbuf),
pad->material_track->parent.track_id,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
if (pad->discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
pad->discont = FALSE;
}
ret = gst_pad_push (GST_PAD_CAST (pad), outbuf);
ret = gst_mxf_demux_combine_flows (demux, pad, ret);
} else {
GST_DEBUG_OBJECT (demux, "Dropping buffer for track %u",
pad->material_track->parent.track_id);
}
if (ret != GST_FLOW_OK)
return ret;
if (pad->component) {
pad->current_component_position++;
if (pad->component->parent.duration != -1 &&
pad->current_component_position >= pad->component->parent.duration) {
GST_DEBUG_OBJECT (demux, "Switching to next component");
if ((ret = gst_mxf_demux_pad_next_component (demux, pad)) != GST_FLOW_OK) {
if (ret == GST_FLOW_UNEXPECTED) {
gboolean eos = TRUE;
GST_DEBUG_OBJECT (demux, "EOS for track");
pad->eos = TRUE;
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *opad = g_ptr_array_index (demux->src, i);
eos &= opad->eos;
}
if (eos) {
GST_DEBUG_OBJECT (demux, "All tracks are EOS");
return GST_FLOW_UNEXPECTED;
} else {
return GST_FLOW_OK;
}
} else {
GST_ERROR_OBJECT (demux, "Switching component failed");
return ret;
}
}
}
}
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_random_index_pack (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
GST_DEBUG_OBJECT (demux,
"Handling random index pack of size %u at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
if (demux->partition_index) {
GST_DEBUG_OBJECT (demux, "Already parsed random index pack");
return GST_FLOW_OK;
}
if (!mxf_random_index_pack_parse (key, GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer), &demux->partition_index)) {
GST_ERROR_OBJECT (demux, "Parsing random index pack failed");
return GST_FLOW_ERROR;
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_index_table_segment (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer)
{
MXFIndexTableSegment segment;
memset (&segment, 0, sizeof (segment));
GST_DEBUG_OBJECT (demux,
"Handling index table segment of size %u at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
if (!demux->primer.valid) {
GST_WARNING_OBJECT (demux, "Invalid primer pack");
return GST_FLOW_OK;
}
if (!mxf_index_table_segment_parse (key, &segment, &demux->primer,
GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer))) {
GST_ERROR_OBJECT (demux, "Parsing index table segment failed");
return GST_FLOW_ERROR;
}
if (!demux->index_table)
demux->index_table =
g_array_new (FALSE, FALSE, sizeof (MXFIndexTableSegment));
g_array_append_val (demux->index_table, segment);
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_pull_klv_packet (GstMXFDemux * demux, guint64 offset, MXFUL * key,
GstBuffer ** outbuf, guint * read)
{
GstBuffer *buffer = NULL;
const guint8 *data;
guint64 data_offset = 0;
guint64 length;
GstFlowReturn ret = GST_FLOW_OK;
memset (key, 0, sizeof (MXFUL));
/* Pull 16 byte key and first byte of BER encoded length */
if ((ret =
gst_mxf_demux_pull_range (demux, offset, 17, &buffer)) != GST_FLOW_OK)
goto beach;
data = GST_BUFFER_DATA (buffer);
memcpy (key, GST_BUFFER_DATA (buffer), 16);
/* Decode BER encoded packet length */
if ((data[16] & 0x80) == 0) {
length = data[16];
data_offset = 17;
} else {
guint slen = data[16] & 0x7f;
data_offset = 16 + 1 + slen;
gst_buffer_unref (buffer);
buffer = NULL;
/* Must be at most 8 according to SMPTE-379M 5.3.4 */
if (slen > 8) {
GST_ERROR_OBJECT (demux, "Invalid KLV packet length: %u", slen);
ret = GST_FLOW_ERROR;
goto beach;
}
/* Now pull the length of the packet */
if ((ret = gst_mxf_demux_pull_range (demux, offset + 17, slen,
&buffer)) != GST_FLOW_OK)
goto beach;
data = GST_BUFFER_DATA (buffer);
length = 0;
while (slen) {
length = (length << 8) | *data;
data++;
slen--;
}
}
gst_buffer_unref (buffer);
buffer = NULL;
/* GStreamer's buffer sizes are stored in a guint so we
* limit ourself to G_MAXUINT large buffers */
if (length > G_MAXUINT) {
GST_ERROR_OBJECT (demux,
"Unsupported KLV packet length: %" G_GUINT64_FORMAT, length);
ret = GST_FLOW_ERROR;
goto beach;
}
/* Pull the complete KLV packet */
if ((ret = gst_mxf_demux_pull_range (demux, offset + data_offset, length,
&buffer)) != GST_FLOW_OK)
goto beach;
*outbuf = buffer;
buffer = NULL;
if (read)
*read = data_offset + length;
beach:
if (buffer)
gst_buffer_unref (buffer);
return ret;
}
void
gst_mxf_demux_pull_random_index_pack (GstMXFDemux * demux)
{
GstBuffer *buffer;
GstFlowReturn ret;
gint64 filesize = -1;
GstFormat fmt = GST_FORMAT_BYTES;
guint32 pack_size;
guint64 old_offset = demux->offset;
MXFUL key;
if (!gst_pad_query_peer_duration (demux->sinkpad, &fmt, &filesize) ||
fmt != GST_FORMAT_BYTES || filesize == -1) {
GST_DEBUG_OBJECT (demux, "Can't query upstream size");
return;
}
g_assert (filesize > 4);
if ((ret =
gst_mxf_demux_pull_range (demux, filesize - 4, 4,
&buffer)) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (demux, "Failed pulling last 4 bytes");
return;
}
pack_size = GST_READ_UINT32_BE (GST_BUFFER_DATA (buffer));
gst_buffer_unref (buffer);
if (pack_size < 20) {
GST_DEBUG_OBJECT (demux, "Too small pack size (%u bytes)", pack_size);
return;
} else if (pack_size > filesize - 20) {
GST_DEBUG_OBJECT (demux, "Too large pack size (%u bytes)", pack_size);
return;
}
if ((ret =
gst_mxf_demux_pull_range (demux, filesize - pack_size, 16,
&buffer)) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (demux, "Failed pulling random index pack key");
return;
}
memcpy (&key, GST_BUFFER_DATA (buffer), 16);
gst_buffer_unref (buffer);
if (!mxf_is_random_index_pack (&key)) {
GST_DEBUG_OBJECT (demux, "No random index pack");
return;
}
demux->offset = filesize - pack_size;
if ((ret =
gst_mxf_demux_pull_klv_packet (demux, filesize - pack_size, &key,
&buffer, NULL)) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (demux, "Failed pulling random index pack");
return;
}
gst_mxf_demux_handle_random_index_pack (demux, &key, buffer);
gst_buffer_unref (buffer);
demux->offset = old_offset;
}
static void
gst_mxf_demux_parse_footer_metadata (GstMXFDemux * demux)
{
MXFPartitionPack partition;
MXFPrimerPack primer;
guint64 offset, old_offset = demux->offset;
MXFUL key;
GstBuffer *buffer = NULL;
guint read = 0;
GstFlowReturn ret = GST_FLOW_OK;
memcpy (&partition, &demux->partition, sizeof (MXFPartitionPack));
memcpy (&primer, &demux->primer, sizeof (MXFPrimerPack));
memset (&demux->partition, 0, sizeof (MXFPartitionPack));
memset (&demux->primer, 0, sizeof (MXFPrimerPack));
gst_mxf_demux_reset_metadata (demux);
if (demux->footer_partition_pack_offset != 0) {
offset =
demux->header_partition_pack_offset +
demux->footer_partition_pack_offset;
} else {
MXFRandomIndexPackEntry *entry =
&g_array_index (demux->partition_index, MXFRandomIndexPackEntry,
demux->partition_index->len - 1);
offset = entry->offset;
}
next_try:
mxf_partition_pack_reset (&demux->partition);
mxf_primer_pack_reset (&demux->primer);
ret = gst_mxf_demux_pull_klv_packet (demux, offset, &key, &buffer, &read);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto out;
if (!mxf_is_partition_pack (&key))
goto out;
if (!mxf_partition_pack_parse (&key, &demux->partition,
GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer)))
goto out;
offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
if (demux->partition.header_byte_count == 0) {
if (demux->partition.prev_partition == 0
|| demux->partition.this_partition == 0)
goto out;
offset =
demux->header_partition_pack_offset + demux->partition.this_partition -
demux->partition.prev_partition;
goto next_try;
}
while (TRUE) {
ret = gst_mxf_demux_pull_klv_packet (demux, offset, &key, &buffer, &read);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
offset =
demux->header_partition_pack_offset +
demux->partition.this_partition - demux->partition.prev_partition;
goto next_try;
}
if (mxf_is_fill (&key)) {
offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
} else if (mxf_is_primer_pack (&key)) {
if (!mxf_primer_pack_parse (&key, &demux->primer,
GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer))) {
offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
offset =
demux->header_partition_pack_offset +
demux->partition.this_partition - demux->partition.prev_partition;
goto next_try;
}
offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
break;
} else {
gst_buffer_unref (buffer);
buffer = NULL;
offset =
demux->header_partition_pack_offset +
demux->partition.this_partition - demux->partition.prev_partition;
goto next_try;
}
}
/* parse metadata */
while (TRUE) {
ret = gst_mxf_demux_pull_klv_packet (demux, offset, &key, &buffer, &read);
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
offset =
demux->header_partition_pack_offset +
demux->partition.this_partition - demux->partition.prev_partition;
goto next_try;
}
if (mxf_is_metadata (&key)) {
ret = gst_mxf_demux_handle_metadata (demux, &key, buffer);
offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
gst_mxf_demux_reset_metadata (demux);
offset =
demux->header_partition_pack_offset +
demux->partition.this_partition - demux->partition.prev_partition;
goto next_try;
}
} else if (mxf_is_descriptive_metadata (&key) || mxf_is_fill (&key)) {
offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
} else {
break;
}
}
/* resolve references etc */
if (gst_mxf_demux_handle_header_metadata_resolve_references (demux) !=
GST_FLOW_OK
|| gst_mxf_demux_handle_header_metadata_update_streams (demux) !=
GST_FLOW_OK) {
offset =
demux->header_partition_pack_offset + demux->partition.this_partition -
demux->partition.prev_partition;
goto next_try;
}
out:
if (buffer)
gst_buffer_unref (buffer);
mxf_partition_pack_reset (&demux->partition);
mxf_primer_pack_reset (&demux->primer);
memcpy (&demux->partition, &partition, sizeof (MXFPartitionPack));
memcpy (&demux->primer, &primer, sizeof (MXFPrimerPack));
demux->offset = old_offset;
}
static GstFlowReturn
gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
#ifndef GST_DISABLE_GST_DEBUG
gchar key_str[48];
#endif
GstFlowReturn ret = GST_FLOW_OK;
if (demux->update_metadata
&& demux->preface
&& !mxf_is_metadata (key) && !mxf_is_descriptive_metadata (key)
&& !mxf_is_fill (key)) {
if ((ret =
gst_mxf_demux_handle_header_metadata_resolve_references (demux)) !=
GST_FLOW_OK)
goto beach;
if ((ret =
gst_mxf_demux_handle_header_metadata_update_streams (demux)) !=
GST_FLOW_OK)
goto beach;
} else if (demux->metadata_resolved && demux->requested_package_string) {
if ((ret =
gst_mxf_demux_handle_header_metadata_update_streams (demux)) !=
GST_FLOW_OK)
goto beach;
}
if (!mxf_is_mxf_packet (key)) {
GST_WARNING_OBJECT (demux,
"Skipping non-MXF packet of size %u at offset %"
G_GUINT64_FORMAT ", key: %s", GST_BUFFER_SIZE (buffer), demux->offset,
mxf_ul_to_string (key, key_str));
} else if (mxf_is_partition_pack (key)) {
ret = gst_mxf_demux_handle_partition_pack (demux, key, buffer);
} else if (mxf_is_primer_pack (key)) {
ret = gst_mxf_demux_handle_primer_pack (demux, key, buffer);
} else if (mxf_is_metadata (key)) {
ret = gst_mxf_demux_handle_metadata (demux, key, buffer);
} else if (mxf_is_descriptive_metadata (key)) {
ret = gst_mxf_demux_handle_descriptive_metadata (demux, key, buffer);
} 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)) {
ret =
gst_mxf_demux_handle_generic_container_essence_element (demux, key,
buffer);
} else if (mxf_is_random_index_pack (key)) {
ret = gst_mxf_demux_handle_random_index_pack (demux, key, buffer);
} else if (mxf_is_index_table_segment (key)) {
ret = gst_mxf_demux_handle_index_table_segment (demux, key, buffer);
} else if (mxf_is_fill (key)) {
GST_DEBUG_OBJECT (demux,
"Skipping filler packet of size %u at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (buffer), demux->offset);
} else {
GST_DEBUG_OBJECT (demux,
"Skipping unknown packet of size %u at offset %"
G_GUINT64_FORMAT ", key: %s", GST_BUFFER_SIZE (buffer), demux->offset,
mxf_ul_to_string (key, key_str));
}
/* In pull mode try to get the last metadata */
if (mxf_is_partition_pack (key) && ret == GST_FLOW_OK
&& demux->pull_footer_metadata
&& demux->random_access && demux->partition.valid
&& demux->partition.type == MXF_PARTITION_PACK_HEADER
&& (!demux->partition.closed || !demux->partition.complete)
&& (demux->footer_partition_pack_offset != 0 ||
demux->partition_index->len > 0)) {
GST_DEBUG_OBJECT (demux,
"Open or incomplete header partition, trying to get final metadata from the last partitions");
gst_mxf_demux_parse_footer_metadata (demux);
demux->pull_footer_metadata = FALSE;
}
beach:
return ret;
}
static GstFlowReturn
gst_mxf_demux_pull_and_handle_klv_packet (GstMXFDemux * demux)
{
GstBuffer *buffer = NULL;
MXFUL key;
GstFlowReturn ret = GST_FLOW_OK;
guint read = 0;
ret =
gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
&read);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer);
demux->offset += read;
beach:
if (buffer)
gst_buffer_unref (buffer);
return ret;
}
static void
gst_mxf_demux_loop (GstPad * pad)
{
GstMXFDemux *demux = NULL;
GstFlowReturn ret = GST_FLOW_OK;
demux = GST_MXF_DEMUX (gst_pad_get_parent (pad));
if (demux->run_in == -1) {
/* Skip run-in, which is at most 64K and is finished
* by a header partition pack */
while (demux->offset < 64 * 1024) {
GstBuffer *buffer;
if ((ret =
gst_mxf_demux_pull_range (demux, demux->offset, 16,
&buffer)) != GST_FLOW_OK)
break;
if (mxf_is_header_partition_pack ((const MXFUL *)
GST_BUFFER_DATA (buffer))) {
GST_DEBUG_OBJECT (demux,
"Found header partition pack at offset %" G_GUINT64_FORMAT,
demux->offset);
demux->run_in = demux->offset;
demux->header_partition_pack_offset = demux->offset;
gst_buffer_unref (buffer);
break;
}
demux->offset++;
gst_buffer_unref (buffer);
}
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
if (G_UNLIKELY (demux->run_in == -1)) {
GST_ERROR_OBJECT (demux, "No valid header partition pack found");
ret = GST_FLOW_ERROR;
goto pause;
}
/* First of all pull&parse the random index pack at EOF */
gst_mxf_demux_pull_random_index_pack (demux);
}
/* Now actually do something */
ret = gst_mxf_demux_pull_and_handle_klv_packet (demux);
/* pause if something went wrong */
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pause;
/* check EOS condition */
if ((demux->segment.flags & GST_SEEK_FLAG_SEGMENT) &&
(demux->segment.stop != -1) &&
(demux->segment.last_stop >= demux->segment.stop)) {
ret = GST_FLOW_UNEXPECTED;
goto pause;
}
gst_object_unref (demux);
return;
pause:
{
const gchar *reason = gst_flow_get_name (ret);
GST_LOG_OBJECT (demux, "pausing task, reason %s", reason);
gst_pad_pause_task (pad);
if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED) {
if (ret == GST_FLOW_UNEXPECTED) {
/* perform EOS logic */
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gint64 stop;
/* for segment playback we need to post when (in stream time)
* we stopped, this is either stop (when set) or the duration. */
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
GST_LOG_OBJECT (demux, "Sending segment done, at end of segment");
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_segment_done (GST_OBJECT_CAST (demux),
GST_FORMAT_TIME, stop));
} else {
/* normal playback, send EOS to all linked pads */
GST_LOG_OBJECT (demux, "Sending EOS, at end of stream");
if (!gst_mxf_demux_push_src_event (demux, gst_event_new_eos ())) {
GST_WARNING_OBJECT (demux, "failed pushing EOS on streams");
}
}
} else {
GST_ELEMENT_ERROR (demux, STREAM, FAILED,
("Internal data stream error."),
("stream stopped, reason %s", reason));
gst_mxf_demux_push_src_event (demux, gst_event_new_eos ());
}
}
gst_object_unref (demux);
return;
}
}
static GstFlowReturn
gst_mxf_demux_chain (GstPad * pad, GstBuffer * inbuf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstMXFDemux *demux = NULL;
MXFUL key;
const guint8 *data = NULL;
guint64 length = 0;
guint64 offset = 0;
GstBuffer *buffer = NULL;
demux = GST_MXF_DEMUX (gst_pad_get_parent (pad));
GST_LOG_OBJECT (demux, "received buffer of %u bytes at offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (inbuf), GST_BUFFER_OFFSET (inbuf));
if (G_UNLIKELY (GST_BUFFER_OFFSET (inbuf) == 0)) {
GST_DEBUG_OBJECT (demux, "beginning of file, expect header");
demux->run_in = -1;
demux->offset = 0;
}
if (G_UNLIKELY (demux->offset == 0 && GST_BUFFER_OFFSET (inbuf) != 0)) {
GST_DEBUG_OBJECT (demux, "offset was zero, synchronizing with buffer's");
demux->offset = GST_BUFFER_OFFSET (inbuf);
}
gst_adapter_push (demux->adapter, inbuf);
inbuf = NULL;
while (ret == GST_FLOW_OK) {
if (G_UNLIKELY (demux->flushing)) {
GST_DEBUG_OBJECT (demux, "we are now flushing, exiting parser loop");
ret = GST_FLOW_WRONG_STATE;
break;
}
if (gst_adapter_available (demux->adapter) < 16)
break;
if (demux->run_in == -1) {
/* Skip run-in, which is at most 64K and is finished
* by a header partition pack */
while (demux->offset < 64 * 1024
&& gst_adapter_available (demux->adapter) >= 16) {
data = gst_adapter_peek (demux->adapter, 16);
if (mxf_is_header_partition_pack ((const MXFUL *)
data)) {
GST_DEBUG_OBJECT (demux,
"Found header partition pack at offset %" G_GUINT64_FORMAT,
demux->offset);
demux->run_in = demux->offset;
demux->header_partition_pack_offset = demux->offset;
break;
}
gst_adapter_flush (demux->adapter, 1);
}
} else if (demux->offset < demux->run_in) {
gst_adapter_flush (demux->adapter,
MIN (gst_adapter_available (demux->adapter),
demux->run_in - demux->offset));
continue;
}
if (G_UNLIKELY (ret != GST_FLOW_OK))
break;
/* Need more data */
if (demux->run_in == -1 && demux->offset < 64 * 1024)
break;
if (G_UNLIKELY (demux->run_in == -1)) {
GST_ERROR_OBJECT (demux, "No valid header partition pack found");
ret = GST_FLOW_ERROR;
break;
}
if (gst_adapter_available (demux->adapter) < 17)
break;
/* Now actually do something */
memset (&key, 0, sizeof (MXFUL));
/* Pull 16 byte key and first byte of BER encoded length */
data = gst_adapter_peek (demux->adapter, 17);
memcpy (&key, data, 16);
/* Decode BER encoded packet length */
if ((data[16] & 0x80) == 0) {
length = data[16];
offset = 17;
} else {
guint slen = data[16] & 0x7f;
offset = 16 + 1 + slen;
/* Must be at most 8 according to SMPTE-379M 5.3.4 and
* GStreamer buffers can only have a 4 bytes length */
if (slen > 8) {
GST_ERROR_OBJECT (demux, "Invalid KLV packet length: %u", slen);
ret = GST_FLOW_ERROR;
break;
}
if (gst_adapter_available (demux->adapter) < 17 + slen)
break;
data = gst_adapter_peek (demux->adapter, 17 + slen);
data += 17;
length = 0;
while (slen) {
length = (length << 8) | *data;
data++;
slen--;
}
}
/* GStreamer's buffer sizes are stored in a guint so we
* limit ourself to G_MAXUINT large buffers */
if (length > G_MAXUINT) {
GST_ERROR_OBJECT (demux,
"Unsupported KLV packet length: %" G_GUINT64_FORMAT, length);
ret = GST_FLOW_ERROR;
break;
}
if (gst_adapter_available (demux->adapter) < offset + length)
break;
gst_adapter_flush (demux->adapter, offset);
buffer = gst_adapter_take_buffer (demux->adapter, length);
ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer);
gst_buffer_unref (buffer);
}
gst_object_unref (demux);
return ret;
}
static gboolean
gst_mxf_demux_src_event (GstPad * pad, GstEvent * event)
{
GstMXFDemux *demux = GST_MXF_DEMUX (gst_pad_get_parent (pad));
gboolean ret;
GST_DEBUG_OBJECT (pad, "handling event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
/* TODO: handle this */
gst_event_unref (event);
ret = FALSE;
break;
default:
ret = gst_pad_push_event (demux->sinkpad, event);
break;
}
gst_object_unref (demux);
return ret;
}
static const GstQueryType *
gst_mxf_demux_src_query_type (GstPad * pad)
{
static const GstQueryType types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
0
};
return types;
}
static gboolean
gst_mxf_demux_src_query (GstPad * pad, GstQuery * query)
{
GstMXFDemux *demux = GST_MXF_DEMUX (gst_pad_get_parent (pad));
gboolean ret = FALSE;
GstMXFDemuxPad *mxfpad = GST_MXF_DEMUX_PAD (pad);
GST_DEBUG_OBJECT (pad, "handling query %s",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 pos;
gst_query_parse_position (query, &format, NULL);
if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT)
goto error;
pos = mxfpad->last_stop;
if (format == GST_FORMAT_DEFAULT && pos != GST_CLOCK_TIME_NONE) {
if (!mxfpad->material_track || mxfpad->material_track->edit_rate.n == 0
|| mxfpad->material_track->edit_rate.d == 0)
goto error;
pos =
gst_util_uint64_scale (pos,
mxfpad->material_track->edit_rate.n,
mxfpad->material_track->edit_rate.d * GST_SECOND);
}
GST_DEBUG_OBJECT (pad,
"Returning position %" G_GINT64_FORMAT " in format %s", pos,
gst_format_get_name (format));
gst_query_set_position (query, format, pos);
ret = TRUE;
break;
}
case GST_QUERY_DURATION:{
gint64 duration;
GstFormat format;
gst_query_parse_duration (query, &format, NULL);
if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT)
goto error;
if (!mxfpad->material_track || !mxfpad->material_track->parent.sequence)
goto error;
duration = mxfpad->material_track->parent.sequence->duration;
if (format == GST_FORMAT_TIME) {
if (mxfpad->material_track->edit_rate.n == 0 ||
mxfpad->material_track->edit_rate.d == 0)
goto error;
duration =
gst_util_uint64_scale (duration,
GST_SECOND * mxfpad->material_track->edit_rate.d,
mxfpad->material_track->edit_rate.n);
}
GST_DEBUG_OBJECT (pad,
"Returning duration %" G_GINT64_FORMAT " in format %s", duration,
gst_format_get_name (format));
gst_query_set_duration (query, format, duration);
ret = TRUE;
break;
}
default:
/* else forward upstream */
ret = gst_pad_peer_query (demux->sinkpad, query);
break;
}
done:
gst_object_unref (demux);
return ret;
/* ERRORS */
error:
{
GST_DEBUG_OBJECT (pad, "query failed");
goto done;
}
}
static gboolean
gst_mxf_demux_sink_activate (GstPad * sinkpad)
{
if (gst_pad_check_pull_range (sinkpad)) {
return gst_pad_activate_pull (sinkpad, TRUE);
} else {
return gst_pad_activate_push (sinkpad, TRUE);
}
}
static gboolean
gst_mxf_demux_sink_activate_push (GstPad * sinkpad, gboolean active)
{
GstMXFDemux *demux;
demux = GST_MXF_DEMUX (gst_pad_get_parent (sinkpad));
demux->random_access = FALSE;
gst_object_unref (demux);
return TRUE;
}
static gboolean
gst_mxf_demux_sink_activate_pull (GstPad * sinkpad, gboolean active)
{
GstMXFDemux *demux;
demux = GST_MXF_DEMUX (gst_pad_get_parent (sinkpad));
if (active) {
demux->random_access = TRUE;
gst_object_unref (demux);
return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_mxf_demux_loop,
sinkpad);
} else {
demux->random_access = FALSE;
gst_object_unref (demux);
return gst_pad_stop_task (sinkpad);
}
}
static gboolean
gst_mxf_demux_sink_event (GstPad * pad, GstEvent * event)
{
GstMXFDemux *demux;
gboolean ret = FALSE;
demux = GST_MXF_DEMUX (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (pad, "handling event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
demux->flushing = TRUE;
ret = gst_mxf_demux_push_src_event (demux, event);
break;
case GST_EVENT_FLUSH_STOP:
gst_mxf_demux_flush (demux, TRUE);
ret = gst_mxf_demux_push_src_event (demux, event);
break;
case GST_EVENT_EOS:
if (!gst_mxf_demux_push_src_event (demux, event))
GST_WARNING_OBJECT (pad, "failed pushing EOS on streams");
ret = TRUE;
break;
case GST_EVENT_NEWSEGMENT:
/* TODO: handle this */
gst_event_unref (event);
ret = FALSE;
break;
default:
ret = gst_mxf_demux_push_src_event (demux, event);
break;
}
gst_object_unref (demux);
return ret;
}
static GstStateChangeReturn
gst_mxf_demux_change_state (GstElement * element, GstStateChange transition)
{
GstMXFDemux *demux = GST_MXF_DEMUX (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_mxf_demux_reset (demux);
break;
default:
break;
}
return ret;
}
static void
gst_mxf_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMXFDemux *demux = GST_MXF_DEMUX (object);
switch (prop_id) {
case PROP_PACKAGE:
g_free (demux->requested_package_string);
demux->requested_package_string = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mxf_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstMXFDemux *demux = GST_MXF_DEMUX (object);
switch (prop_id) {
case PROP_PACKAGE:
g_value_set_string (value, demux->current_package_string);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mxf_demux_finalize (GObject * object)
{
GstMXFDemux *demux = GST_MXF_DEMUX (object);
if (demux->adapter) {
g_object_unref (demux->adapter);
demux->adapter = NULL;
}
if (demux->new_seg_event) {
gst_event_unref (demux->new_seg_event);
demux->new_seg_event = NULL;
}
if (demux->close_seg_event) {
gst_event_unref (demux->close_seg_event);
demux->close_seg_event = NULL;
}
g_free (demux->current_package_string);
demux->current_package_string = NULL;
g_free (demux->requested_package_string);
demux->requested_package_string = NULL;
gst_mxf_demux_remove_pads (demux);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_mxf_demux_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&mxf_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&mxf_src_template));
gst_element_class_set_details_simple (element_class, "MXF Demuxer",
"Codec/Demuxer",
"Demux MXF files", "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
static void
gst_mxf_demux_class_init (GstMXFDemuxClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (mxfdemux_debug, "mxfdemux", 0, "MXF demuxer");
gobject_class->finalize = gst_mxf_demux_finalize;
gobject_class->set_property = gst_mxf_demux_set_property;
gobject_class->get_property = gst_mxf_demux_get_property;
g_object_class_install_property (gobject_class, PROP_PACKAGE,
g_param_spec_string ("package", "Package",
"Material or Source package to use for playback", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_mxf_demux_change_state);
}
static void
gst_mxf_demux_init (GstMXFDemux * demux, GstMXFDemuxClass * g_class)
{
demux->sinkpad =
gst_pad_new_from_static_template (&mxf_sink_template, "sink");
gst_pad_set_event_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mxf_demux_sink_event));
gst_pad_set_chain_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mxf_demux_chain));
gst_pad_set_activate_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mxf_demux_sink_activate));
gst_pad_set_activatepull_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mxf_demux_sink_activate_pull));
gst_pad_set_activatepush_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mxf_demux_sink_activate_push));
gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
demux->adapter = gst_adapter_new ();
demux->src = g_ptr_array_new ();
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
gst_mxf_demux_reset (demux);
}
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