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gstreamer/gst/mxf/mxfdemux.c
Thibault Saunier ebb0527e75 mxfdemux: Avoid possible NULL caps 'dereferencing'
2019-03-21 00:40:53 +00:00

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/* GStreamer
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-mxfdemux
* @title: mxfdemux
*
* mxfdemux demuxes an MXF file into the different contained streams.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v filesrc location=/path/to/mxf ! mxfdemux ! audioconvert ! autoaudiosink
* ]| This pipeline demuxes an MXF file and outputs one of the contained raw audio streams.
*
*/
/* TODO:
* - Handle timecode tracks correctly (where is this documented?)
* - Handle drop-frame field of timecode tracks
* - Handle Generic container system items
* - Implement correct support for clip-wrapped essence elements.
* - 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 more support for non-standard MXF used by Avid (bug #561922).
* - Fix frame layout stuff, i.e. interlaced/progressive
* - In pull mode first find the first buffer for every pad before pushing
* to prevent jumpy playback in the beginning due to resynchronization.
*
* - Implement SMPTE D11 essence and the digital cinema/MXF specs
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mxfdemux.h"
#include "mxfessence.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
static GstFlowReturn
gst_mxf_demux_pull_klv_packet (GstMXFDemux * demux, guint64 offset, MXFUL * key,
GstBuffer ** outbuf, guint * read);
static GstFlowReturn
gst_mxf_demux_handle_index_table_segment (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer, guint64 offset);
static void collect_index_table_segments (GstMXFDemux * demux);
GType gst_mxf_demux_pad_get_type (void);
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);
if (pad->tags) {
gst_tag_list_unref (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->position = 0;
pad->current_material_track_position = 0;
}
enum
{
PROP_0,
PROP_PACKAGE,
PROP_MAX_DRIFT,
PROP_STRUCTURE
};
static gboolean gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_mxf_demux_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_mxf_demux_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
#define gst_mxf_demux_parent_class parent_class
G_DEFINE_TYPE (GstMXFDemux, gst_mxf_demux, GST_TYPE_ELEMENT);
static void
gst_mxf_demux_remove_pad (GstMXFDemuxPad * pad, GstMXFDemux * demux)
{
gst_flow_combiner_remove_pad (demux->flowcombiner, GST_PAD_CAST (pad));
gst_element_remove_pad (GST_ELEMENT (demux), GST_PAD_CAST (pad));
}
static void
gst_mxf_demux_remove_pads (GstMXFDemux * demux)
{
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_set_size (demux->src, 0);
}
static void
gst_mxf_demux_partition_free (GstMXFDemuxPartition * partition)
{
mxf_partition_pack_reset (&partition->partition);
mxf_primer_pack_reset (&partition->primer);
g_free (partition);
}
static void
gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux)
{
guint i;
GST_DEBUG_OBJECT (demux, "Resetting MXF state");
g_list_foreach (demux->partitions, (GFunc) gst_mxf_demux_partition_free,
NULL);
g_list_free (demux->partitions);
demux->partitions = NULL;
demux->current_partition = NULL;
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (t->offsets)
g_array_free (t->offsets, TRUE);
g_free (t->mapping_data);
if (t->tags)
gst_tag_list_unref (t->tags);
if (t->caps)
gst_caps_unref (t->caps);
}
g_array_set_size (demux->essence_tracks, 0);
}
static void
gst_mxf_demux_reset_linked_metadata (GstMXFDemux * demux)
{
guint i;
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *pad = g_ptr_array_index (demux->src, i);
pad->material_track = NULL;
pad->material_package = NULL;
pad->current_component = NULL;
}
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *track =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
track->source_package = NULL;
track->source_track = NULL;
}
demux->current_package = NULL;
}
static void
gst_mxf_demux_reset_metadata (GstMXFDemux * demux)
{
GST_DEBUG_OBJECT (demux, "Resetting metadata");
g_rw_lock_writer_lock (&demux->metadata_lock);
demux->update_metadata = TRUE;
demux->metadata_resolved = FALSE;
gst_mxf_demux_reset_linked_metadata (demux);
demux->preface = NULL;
if (demux->metadata) {
g_hash_table_destroy (demux->metadata);
}
demux->metadata = mxf_metadata_hash_table_new ();
if (demux->tags) {
gst_tag_list_unref (demux->tags);
demux->tags = NULL;
}
g_rw_lock_writer_unlock (&demux->metadata_lock);
}
static void
gst_mxf_demux_reset (GstMXFDemux * demux)
{
GST_DEBUG_OBJECT (demux, "cleaning up MXF demuxer");
demux->flushing = FALSE;
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));
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
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->random_index_pack) {
g_array_free (demux->random_index_pack, TRUE);
demux->random_index_pack = NULL;
}
if (demux->pending_index_table_segments) {
GList *l;
for (l = demux->pending_index_table_segments; l; l = l->next) {
MXFIndexTableSegment *s = l->data;
mxf_index_table_segment_reset (s);
g_free (s);
}
g_list_free (demux->pending_index_table_segments);
demux->pending_index_table_segments = NULL;
}
if (demux->index_tables) {
GList *l;
for (l = demux->index_tables; l; l = l->next) {
GstMXFDemuxIndexTable *t = l->data;
g_array_free (t->offsets, TRUE);
g_free (t);
}
g_list_free (demux->index_tables);
demux->index_tables = NULL;
}
demux->index_table_segments_collected = FALSE;
gst_mxf_demux_reset_mxf_state (demux);
gst_mxf_demux_reset_metadata (demux);
demux->have_group_id = FALSE;
demux->group_id = G_MAXUINT;
}
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_get_size (*buffer) != size)) {
GST_WARNING_OBJECT (demux,
"partial pull got %" G_GSIZE_FORMAT " when expecting %u from offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (*buffer), size, offset);
gst_buffer_unref (*buffer);
ret = GST_FLOW_EOS;
*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));
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *pad = GST_MXF_DEMUX_PAD (g_ptr_array_index (demux->src, i));
if (pad->eos && GST_EVENT_TYPE (event) == GST_EVENT_EOS)
continue;
ret |= gst_pad_push_event (GST_PAD_CAST (pad), gst_event_ref (event));
}
gst_event_unref (event);
return ret;
}
static GstMXFDemuxPad *
gst_mxf_demux_get_earliest_pad (GstMXFDemux * demux)
{
guint i;
GstClockTime earliest = GST_CLOCK_TIME_NONE;
GstMXFDemuxPad *pad = NULL;
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
if (!p->eos && p->position < earliest) {
earliest = p->position;
pad = p;
}
}
return pad;
}
static gint
gst_mxf_demux_partition_compare (GstMXFDemuxPartition * a,
GstMXFDemuxPartition * b)
{
if (a->partition.this_partition < b->partition.this_partition)
return -1;
else if (a->partition.this_partition > b->partition.this_partition)
return 1;
else
return 0;
}
static GstFlowReturn
gst_mxf_demux_handle_partition_pack (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
MXFPartitionPack partition;
GList *l;
GstMXFDemuxPartition *p = NULL;
GstMapInfo map;
gboolean ret;
GST_DEBUG_OBJECT (demux,
"Handling partition pack of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (buffer), demux->offset);
for (l = demux->partitions; l; l = l->next) {
GstMXFDemuxPartition *tmp = l->data;
if (tmp->partition.this_partition + demux->run_in == demux->offset &&
tmp->partition.major_version == 0x0001) {
GST_DEBUG_OBJECT (demux, "Partition already parsed");
p = tmp;
goto out;
}
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
ret = mxf_partition_pack_parse (key, &partition, map.data, map.size);
gst_buffer_unmap (buffer, &map);
if (!ret) {
GST_ERROR_OBJECT (demux, "Parsing partition pack failed");
return GST_FLOW_ERROR;
}
if (partition.this_partition != demux->offset + demux->run_in) {
GST_WARNING_OBJECT (demux, "Partition with incorrect offset");
partition.this_partition = demux->offset + demux->run_in;
}
if (partition.type == MXF_PARTITION_PACK_HEADER)
demux->footer_partition_pack_offset = partition.footer_partition;
for (l = demux->partitions; l; l = l->next) {
GstMXFDemuxPartition *tmp = l->data;
if (tmp->partition.this_partition + demux->run_in == demux->offset) {
p = tmp;
break;
}
}
if (p) {
mxf_partition_pack_reset (&p->partition);
memcpy (&p->partition, &partition, sizeof (MXFPartitionPack));
} else {
p = g_new0 (GstMXFDemuxPartition, 1);
memcpy (&p->partition, &partition, sizeof (MXFPartitionPack));
demux->partitions =
g_list_insert_sorted (demux->partitions, p,
(GCompareFunc) gst_mxf_demux_partition_compare);
}
for (l = demux->partitions; l; l = l->next) {
GstMXFDemuxPartition *a, *b;
if (l->next == NULL)
break;
a = l->data;
b = l->next->data;
b->partition.prev_partition = a->partition.this_partition;
}
out:
demux->current_partition = p;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_primer_pack (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
GstMapInfo map;
gboolean ret;
GST_DEBUG_OBJECT (demux,
"Handling primer pack of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (buffer), demux->offset);
if (G_UNLIKELY (!demux->current_partition)) {
GST_ERROR_OBJECT (demux, "Primer pack before partition pack");
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (demux->current_partition->primer.mappings)) {
GST_DEBUG_OBJECT (demux, "Primer pack already exists");
return GST_FLOW_OK;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
ret = mxf_primer_pack_parse (key, &demux->current_partition->primer,
map.data, map.size);
gst_buffer_unmap (buffer, &map);
if (!ret) {
GST_ERROR_OBJECT (demux, "Parsing primer pack failed");
return GST_FLOW_ERROR;
}
demux->current_partition->primer.offset = demux->offset;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_resolve_references (GstMXFDemux * demux)
{
GstFlowReturn ret = GST_FLOW_OK;
GHashTableIter iter;
MXFMetadataBase *m = NULL;
GstStructure *structure;
g_rw_lock_writer_lock (&demux->metadata_lock);
GST_DEBUG_OBJECT (demux, "Resolve metadata references");
demux->update_metadata = FALSE;
if (!demux->metadata) {
GST_ERROR_OBJECT (demux, "No metadata yet");
g_rw_lock_writer_unlock (&demux->metadata_lock);
return GST_FLOW_ERROR;
}
g_hash_table_iter_init (&iter, demux->metadata);
while (g_hash_table_iter_next (&iter, NULL, (gpointer) & m)) {
m->resolved = MXF_METADATA_BASE_RESOLVE_STATE_NONE;
}
g_hash_table_iter_init (&iter, demux->metadata);
while (g_hash_table_iter_next (&iter, NULL, (gpointer) & m)) {
gboolean resolved;
resolved = mxf_metadata_base_resolve (m, demux->metadata);
/* 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;
structure =
mxf_metadata_base_to_structure (MXF_METADATA_BASE (demux->preface));
if (!demux->tags)
demux->tags = gst_tag_list_new_empty ();
gst_tag_list_add (demux->tags, GST_TAG_MERGE_REPLACE, GST_TAG_MXF_STRUCTURE,
structure, NULL);
gst_structure_free (structure);
g_rw_lock_writer_unlock (&demux->metadata_lock);
return ret;
error:
demux->metadata_resolved = FALSE;
g_rw_lock_writer_unlock (&demux->metadata_lock);
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 = { {0,}
};
if (!mxf_umid_from_string (demux->requested_package_string, &umid)) {
GST_ERROR_OBJECT (demux, "Invalid requested package");
}
g_free (demux->requested_package_string);
demux->requested_package_string = NULL;
ret = gst_mxf_demux_find_package (demux, &umid);
}
if (!ret && !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)))
goto done;
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");
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)))
goto done;
ret = NULL;
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;
}
done:
if (mxf_umid_is_equal (&ret->package_uid, &demux->current_package_uid)) {
gchar current_package_string[96];
gst_mxf_demux_remove_pads (demux);
memcpy (&demux->current_package_uid, &ret->package_uid, 32);
mxf_umid_to_string (&ret->package_uid, current_package_string);
demux->current_package_string = g_strdup (current_package_string);
g_object_notify (G_OBJECT (demux), "package");
if (!demux->tags)
demux->tags = gst_tag_list_new_empty ();
gst_tag_list_add (demux->tags, GST_TAG_MERGE_REPLACE, GST_TAG_MXF_UMID,
demux->current_package_string, NULL);
}
demux->current_package = ret;
return ret;
}
static GstFlowReturn
gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux)
{
guint i, j, k;
g_return_val_if_fail (demux->preface->content_storage, GST_FLOW_ERROR);
g_return_val_if_fail (demux->preface->content_storage->essence_container_data,
GST_FLOW_ERROR);
for (i = 0; i < demux->preface->content_storage->n_essence_container_data;
i++) {
MXFMetadataEssenceContainerData *edata;
MXFMetadataSourcePackage *package;
if (demux->preface->content_storage->essence_container_data[i] == NULL)
continue;
edata = demux->preface->content_storage->essence_container_data[i];
if (!edata->linked_package) {
GST_WARNING_OBJECT (demux, "Linked package not resolved");
continue;
}
package = edata->linked_package;
if (!package->parent.tracks) {
GST_WARNING_OBJECT (demux, "Linked package with no resolved tracks");
continue;
}
for (j = 0; j < package->parent.n_tracks; j++) {
MXFMetadataTimelineTrack *track;
GstMXFDemuxEssenceTrack *etrack = NULL;
GstCaps *caps = NULL;
gboolean new = FALSE;
if (!package->parent.tracks[j]
|| !MXF_IS_METADATA_TIMELINE_TRACK (package->parent.tracks[j]))
continue;
track = MXF_METADATA_TIMELINE_TRACK (package->parent.tracks[j]);
if ((track->parent.type & 0xf0) != 0x30)
continue;
if (track->edit_rate.n <= 0 || track->edit_rate.d <= 0) {
GST_WARNING_OBJECT (demux, "Invalid edit rate");
continue;
}
for (k = 0; k < demux->essence_tracks->len; k++) {
GstMXFDemuxEssenceTrack *tmp =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
k);
if (tmp->track_number == track->parent.track_number &&
tmp->body_sid == edata->body_sid) {
if (tmp->track_id != track->parent.track_id ||
!mxf_umid_is_equal (&tmp->source_package_uid,
&package->parent.package_uid)) {
GST_ERROR_OBJECT (demux, "There already exists a different track "
"with this track number and body sid but a different source "
"or source track id -- ignoring");
continue;
}
etrack = tmp;
break;
}
}
if (!etrack) {
GstMXFDemuxEssenceTrack tmp;
memset (&tmp, 0, sizeof (tmp));
tmp.body_sid = edata->body_sid;
tmp.index_sid = edata->index_sid;
tmp.track_number = track->parent.track_number;
tmp.track_id = track->parent.track_id;
memcpy (&tmp.source_package_uid, &package->parent.package_uid, 32);
if (demux->current_partition->partition.body_sid == edata->body_sid &&
demux->current_partition->partition.body_offset == 0)
tmp.position = 0;
else
tmp.position = -1;
g_array_append_val (demux->essence_tracks, tmp);
etrack =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
demux->essence_tracks->len - 1);
new = TRUE;
}
etrack->source_package = NULL;
etrack->source_track = NULL;
if (!track->parent.sequence) {
GST_WARNING_OBJECT (demux, "Source track has no sequence");
goto next;
}
if (track->parent.n_descriptor == 0) {
GST_WARNING_OBJECT (demux, "Source track has no descriptors");
goto next;
}
if (track->parent.sequence->duration > etrack->duration)
etrack->duration = track->parent.sequence->duration;
g_free (etrack->mapping_data);
etrack->mapping_data = NULL;
etrack->handler = NULL;
etrack->handle_func = NULL;
if (etrack->tags)
gst_tag_list_unref (etrack->tags);
etrack->tags = NULL;
etrack->handler = mxf_essence_element_handler_find (track);
if (!etrack->handler) {
gchar essence_container[48];
gchar essence_compression[48];
gchar *name;
GST_WARNING_OBJECT (demux,
"No essence element handler for track %u found", i);
mxf_ul_to_string (&track->parent.descriptor[0]->essence_container,
essence_container);
if (track->parent.type == MXF_METADATA_TRACK_PICTURE_ESSENCE) {
if (MXF_IS_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR (track->parent.
descriptor[0]))
mxf_ul_to_string (&MXF_METADATA_GENERIC_PICTURE_ESSENCE_DESCRIPTOR
(track->parent.descriptor[0])->picture_essence_coding,
essence_compression);
name =
g_strdup_printf ("video/x-mxf-%s-%s", essence_container,
essence_compression);
} else if (track->parent.type == MXF_METADATA_TRACK_SOUND_ESSENCE) {
if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->parent.
descriptor[0]))
mxf_ul_to_string (&MXF_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR
(track->parent.descriptor[0])->sound_essence_compression,
essence_compression);
name =
g_strdup_printf ("audio/x-mxf-%s-%s", essence_container,
essence_compression);
} else if (track->parent.type == MXF_METADATA_TRACK_DATA_ESSENCE) {
if (MXF_IS_METADATA_GENERIC_DATA_ESSENCE_DESCRIPTOR (track->parent.
descriptor[0]))
mxf_ul_to_string (&MXF_METADATA_GENERIC_DATA_ESSENCE_DESCRIPTOR
(track->parent.descriptor[0])->data_essence_coding,
essence_compression);
name =
g_strdup_printf ("application/x-mxf-%s-%s", essence_container,
essence_compression);
} else {
name = NULL;
g_assert_not_reached ();
}
caps = gst_caps_new_empty_simple (name);
g_free (name);
etrack->intra_only = FALSE;
} else {
caps =
etrack->handler->create_caps (track, &etrack->tags,
&etrack->intra_only, &etrack->handle_func, &etrack->mapping_data);
}
GST_DEBUG_OBJECT (demux, "Created caps %" GST_PTR_FORMAT, caps);
if (!caps && new) {
GST_WARNING_OBJECT (demux, "No caps created, ignoring stream");
g_free (etrack->mapping_data);
etrack->mapping_data = NULL;
if (etrack->tags)
gst_tag_list_unref (etrack->tags);
etrack->tags = NULL;
goto next;
} else if (!caps) {
GST_WARNING_OBJECT (demux, "Couldn't create updated caps for stream");
} else if (!etrack->caps || !gst_caps_is_equal (etrack->caps, caps)) {
if (etrack->caps)
gst_caps_unref (etrack->caps);
etrack->caps = caps;
} else {
gst_caps_unref (caps);
caps = NULL;
}
if (etrack->handler != NULL) {
MXFEssenceWrapping track_wrapping;
track_wrapping = etrack->handler->get_track_wrapping (track);
if (track_wrapping == MXF_ESSENCE_WRAPPING_CLIP_WRAPPING) {
GST_ELEMENT_ERROR (demux, STREAM, NOT_IMPLEMENTED, (NULL),
("Clip essence wrapping is not implemented yet."));
return GST_FLOW_ERROR;
} else if (track_wrapping == MXF_ESSENCE_WRAPPING_CUSTOM_WRAPPING) {
GST_ELEMENT_ERROR (demux, STREAM, NOT_IMPLEMENTED, (NULL),
("Custom essence wrappings are not supported."));
return GST_FLOW_ERROR;
}
}
etrack->source_package = package;
etrack->source_track = track;
continue;
next:
if (new) {
g_free (etrack->mapping_data);
if (etrack->tags)
gst_tag_list_unref (etrack->tags);
if (etrack->caps)
gst_caps_unref (etrack->caps);
g_array_remove_index (demux->essence_tracks,
demux->essence_tracks->len - 1);
}
}
}
if (demux->essence_tracks->len == 0) {
GST_ERROR_OBJECT (demux, "No valid essence tracks in this file");
return GST_FLOW_ERROR;
}
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (!etrack->source_package || !etrack->source_track || !etrack->caps) {
GST_ERROR_OBJECT (demux, "Failed to update essence track %u", i);
return GST_FLOW_ERROR;
}
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_update_tracks (GstMXFDemux * demux)
{
MXFMetadataGenericPackage *current_package = NULL;
guint i, j, k;
gboolean first_run;
guint component_index;
GstFlowReturn ret;
GList *pads = NULL, *l;
GstVideoTimeCode start_timecode = GST_VIDEO_TIME_CODE_INIT;
g_rw_lock_writer_lock (&demux->metadata_lock);
GST_DEBUG_OBJECT (demux, "Updating tracks");
if ((ret = gst_mxf_demux_update_essence_tracks (demux)) != GST_FLOW_OK) {
goto error;
}
current_package = gst_mxf_demux_choose_package (demux);
if (!current_package) {
GST_ERROR_OBJECT (demux, "Unable to find current package");
ret = GST_FLOW_ERROR;
goto error;
} else if (!current_package->tracks) {
GST_ERROR_OBJECT (demux, "Current package has no (resolved) tracks");
ret = GST_FLOW_ERROR;
goto error;
} else if (!current_package->n_essence_tracks) {
GST_ERROR_OBJECT (demux, "Current package has no essence tracks");
ret = GST_FLOW_ERROR;
goto error;
}
first_run = (demux->src->len == 0);
/* For material packages, there must be one timecode track with one
* continuous timecode. For source packages there might be multiple,
* discontinuous timecode components.
* TODO: Support multiple timecode components
*/
for (i = 0; i < current_package->n_tracks; i++) {
MXFMetadataTimelineTrack *track = NULL;
MXFMetadataSequence *sequence = NULL;
MXFMetadataTimecodeComponent *component = NULL;
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 (!track->parent.sequence)
continue;
sequence = track->parent.sequence;
if (sequence->n_structural_components != 1 ||
!sequence->structural_components[0]
||
!MXF_IS_METADATA_TIMECODE_COMPONENT (sequence->structural_components
[0]))
continue;
component =
MXF_METADATA_TIMECODE_COMPONENT (sequence->structural_components[0]);
/* Not a timecode track */
if (track->parent.type && (track->parent.type & 0xf0) != 0x10)
continue;
/* Main timecode track must have id 1, all others must be 0 */
if (track->parent.track_id != 1)
continue;
gst_video_time_code_init (&start_timecode, track->edit_rate.n,
track->edit_rate.d, NULL, (component->drop_frame
?
GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME
: GST_VIDEO_TIME_CODE_FLAGS_NONE), 0, 0, 0, 0, 0);
gst_video_time_code_add_frames (&start_timecode, track->origin);
gst_video_time_code_add_frames (&start_timecode, component->start_timecode);
break;
}
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;
GstMXFDemuxEssenceTrack *etrack = NULL;
GstMXFDemuxPad *pad = NULL;
GstCaps *pad_caps;
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 (!first_run) {
/* 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_index;
else
component_index = 0;
if (!track->parent.sequence) {
GST_WARNING_OBJECT (demux, "Track with no sequence");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
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) {
GST_WARNING_OBJECT (demux, "NULL component in non-source package");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
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");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
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");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
for (k = 0; k < demux->essence_tracks->len; k++) {
GstMXFDemuxEssenceTrack *tmp =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, k);
if (tmp->source_package == source_package &&
tmp->source_track == source_track) {
etrack = tmp;
break;
}
}
if (!etrack) {
GST_WARNING_OBJECT (demux, "No essence track for this track found");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
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");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
if (MXF_IS_METADATA_MATERIAL_PACKAGE (current_package) && !component) {
GST_WARNING_OBJECT (demux,
"Playing material package but found no component for track");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
if (!source_package->descriptor) {
GST_WARNING_OBJECT (demux, "Source package has no descriptors");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
if (!source_track->parent.descriptor) {
GST_WARNING_OBJECT (demux, "No descriptor found for track");
if (!pad) {
continue;
} else {
ret = GST_FLOW_ERROR;
goto error;
}
}
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 (demux->tags)
pad->tags = gst_tag_list_copy (demux->tags);
}
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;
pad->start_timecode = start_timecode;
/* If we just added the pad initialize for the current component */
if (first_run && MXF_IS_METADATA_MATERIAL_PACKAGE (current_package)) {
pad->current_component_index = 0;
pad->current_component_start = source_track->origin;
pad->current_component_start_position = 0;
if (component->parent.duration >= -1)
pad->current_component_duration = component->parent.duration;
else
pad->current_component_duration = -1;
if (track->edit_rate.n != source_track->edit_rate.n ||
track->edit_rate.d != source_track->edit_rate.d) {
pad->current_component_start +=
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);
if (pad->current_component_duration != -1)
pad->current_component_duration =
gst_util_uint64_scale (pad->current_component_duration,
source_track->edit_rate.n * track->edit_rate.d,
source_track->edit_rate.d * track->edit_rate.n);
} else {
pad->current_component_start += component->start_position;
}
pad->current_essence_track_position = pad->current_component_start;
}
/* NULL iff playing a source package */
pad->current_component = component;
pad->current_essence_track = etrack;
if (etrack->tags) {
if (pad->tags)
gst_tag_list_insert (pad->tags, etrack->tags, GST_TAG_MERGE_REPLACE);
else
pad->tags = gst_tag_list_copy (etrack->tags);
}
pad_caps = gst_pad_get_current_caps (GST_PAD_CAST (pad));
if (pad_caps && !gst_caps_is_equal (pad_caps, etrack->caps)) {
gst_pad_set_caps (GST_PAD_CAST (pad), etrack->caps);
} else if (!pad_caps) {
GstEvent *event;
gchar *stream_id;
gst_pad_set_event_function (GST_PAD_CAST (pad),
GST_DEBUG_FUNCPTR (gst_mxf_demux_src_event));
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);
stream_id =
gst_pad_create_stream_id_printf (GST_PAD_CAST (pad),
GST_ELEMENT_CAST (demux), "%03u", pad->track_id);
event =
gst_pad_get_sticky_event (demux->sinkpad, GST_EVENT_STREAM_START, 0);
if (event) {
if (gst_event_parse_group_id (event, &demux->group_id))
demux->have_group_id = TRUE;
else
demux->have_group_id = FALSE;
gst_event_unref (event);
} else if (!demux->have_group_id) {
demux->have_group_id = TRUE;
demux->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (demux->have_group_id)
gst_event_set_group_id (event, demux->group_id);
gst_pad_push_event (GST_PAD_CAST (pad), event);
g_free (stream_id);
gst_pad_set_caps (GST_PAD_CAST (pad), etrack->caps);
pads = g_list_prepend (pads, gst_object_ref (pad));
g_ptr_array_add (demux->src, pad);
pad->discont = TRUE;
}
if (pad_caps)
gst_caps_unref (pad_caps);
}
if (demux->src->len > 0) {
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *pad = g_ptr_array_index (demux->src, i);
if (!pad->material_track || !pad->material_package) {
GST_ERROR_OBJECT (demux, "Unable to update existing pad");
ret = GST_FLOW_ERROR;
goto error;
}
}
} else {
GST_ERROR_OBJECT (demux, "Couldn't create any streams");
ret = GST_FLOW_ERROR;
goto error;
}
g_rw_lock_writer_unlock (&demux->metadata_lock);
for (l = pads; l; l = l->next) {
gst_flow_combiner_add_pad (demux->flowcombiner, l->data);
gst_element_add_pad (GST_ELEMENT_CAST (demux), l->data);
}
g_list_free (pads);
if (first_run)
gst_element_no_more_pads (GST_ELEMENT_CAST (demux));
return GST_FLOW_OK;
error:
g_rw_lock_writer_unlock (&demux->metadata_lock);
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_metadata (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
guint16 type;
MXFMetadata *metadata = NULL, *old = NULL;
GstMapInfo map;
GstFlowReturn ret = GST_FLOW_OK;
type = GST_READ_UINT16_BE (key->u + 13);
GST_DEBUG_OBJECT (demux,
"Handling metadata of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT " of type 0x%04x", gst_buffer_get_size (buffer),
demux->offset, type);
if (G_UNLIKELY (!demux->current_partition)) {
GST_ERROR_OBJECT (demux, "Partition pack doesn't exist");
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (!demux->current_partition->primer.mappings)) {
GST_ERROR_OBJECT (demux, "Primer pack doesn't exists");
return GST_FLOW_ERROR;
}
if (demux->current_partition->parsed_metadata) {
GST_DEBUG_OBJECT (demux, "Metadata of this partition was already parsed");
return GST_FLOW_OK;
}
if (gst_buffer_get_size (buffer) == 0)
return GST_FLOW_OK;
gst_buffer_map (buffer, &map, GST_MAP_READ);
metadata =
mxf_metadata_new (type, &demux->current_partition->primer, demux->offset,
map.data, map.size);
gst_buffer_unmap (buffer, &map);
if (!metadata) {
GST_WARNING_OBJECT (demux,
"Unknown or unhandled metadata of type 0x%04x", type);
return GST_FLOW_OK;
}
old =
g_hash_table_lookup (demux->metadata,
&MXF_METADATA_BASE (metadata)->instance_uid);
if (old && G_TYPE_FROM_INSTANCE (old) != G_TYPE_FROM_INSTANCE (metadata)) {
#ifndef GST_DISABLE_GST_DEBUG
gchar str[48];
#endif
GST_DEBUG_OBJECT (demux,
"Metadata with instance uid %s already exists and has different type '%s',"
" expected '%s'",
mxf_uuid_to_string (&MXF_METADATA_BASE (metadata)->instance_uid, str),
g_type_name (G_TYPE_FROM_INSTANCE (old)),
g_type_name (G_TYPE_FROM_INSTANCE (metadata)));
g_object_unref (metadata);
return GST_FLOW_ERROR;
} else if (old
&& MXF_METADATA_BASE (old)->offset >=
MXF_METADATA_BASE (metadata)->offset) {
#ifndef GST_DISABLE_GST_DEBUG
gchar str[48];
#endif
GST_DEBUG_OBJECT (demux,
"Metadata with instance uid %s already exists and is newer",
mxf_uuid_to_string (&MXF_METADATA_BASE (metadata)->instance_uid, str));
g_object_unref (metadata);
return GST_FLOW_OK;
}
g_rw_lock_writer_lock (&demux->metadata_lock);
demux->update_metadata = TRUE;
if (MXF_IS_METADATA_PREFACE (metadata)) {
demux->preface = MXF_METADATA_PREFACE (metadata);
}
gst_mxf_demux_reset_linked_metadata (demux);
g_hash_table_replace (demux->metadata,
&MXF_METADATA_BASE (metadata)->instance_uid, metadata);
g_rw_lock_writer_unlock (&demux->metadata_lock);
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_descriptive_metadata (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer)
{
guint32 type;
guint8 scheme;
GstMapInfo map;
GstFlowReturn ret = GST_FLOW_OK;
MXFDescriptiveMetadata *m = NULL, *old = NULL;
scheme = GST_READ_UINT8 (key->u + 12);
type = GST_READ_UINT24_BE (key->u + 13);
GST_DEBUG_OBJECT (demux,
"Handling descriptive metadata of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT " with scheme 0x%02x and type 0x%06x",
gst_buffer_get_size (buffer), demux->offset, scheme, type);
if (G_UNLIKELY (!demux->current_partition)) {
GST_ERROR_OBJECT (demux, "Partition pack doesn't exist");
return GST_FLOW_ERROR;
}
if (G_UNLIKELY (!demux->current_partition->primer.mappings)) {
GST_ERROR_OBJECT (demux, "Primer pack doesn't exists");
return GST_FLOW_ERROR;
}
if (demux->current_partition->parsed_metadata) {
GST_DEBUG_OBJECT (demux, "Metadata of this partition was already parsed");
return GST_FLOW_OK;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
m = mxf_descriptive_metadata_new (scheme, type,
&demux->current_partition->primer, demux->offset, map.data, map.size);
gst_buffer_unmap (buffer, &map);
if (!m) {
GST_WARNING_OBJECT (demux,
"Unknown or unhandled descriptive metadata of scheme 0x%02x and type 0x%06x",
scheme, type);
return GST_FLOW_OK;
}
old =
g_hash_table_lookup (demux->metadata,
&MXF_METADATA_BASE (m)->instance_uid);
if (old && G_TYPE_FROM_INSTANCE (old) != G_TYPE_FROM_INSTANCE (m)) {
#ifndef GST_DISABLE_GST_DEBUG
gchar str[48];
#endif
GST_DEBUG_OBJECT (demux,
"Metadata with instance uid %s already exists and has different type '%s',"
" expected '%s'",
mxf_uuid_to_string (&MXF_METADATA_BASE (m)->instance_uid, str),
g_type_name (G_TYPE_FROM_INSTANCE (old)),
g_type_name (G_TYPE_FROM_INSTANCE (m)));
g_object_unref (m);
return GST_FLOW_ERROR;
} else if (old
&& MXF_METADATA_BASE (old)->offset >= MXF_METADATA_BASE (m)->offset) {
#ifndef GST_DISABLE_GST_DEBUG
gchar str[48];
#endif
GST_DEBUG_OBJECT (demux,
"Metadata with instance uid %s already exists and is newer",
mxf_uuid_to_string (&MXF_METADATA_BASE (m)->instance_uid, str));
g_object_unref (m);
return GST_FLOW_OK;
}
g_rw_lock_writer_lock (&demux->metadata_lock);
demux->update_metadata = TRUE;
gst_mxf_demux_reset_linked_metadata (demux);
g_hash_table_replace (demux->metadata, &MXF_METADATA_BASE (m)->instance_uid,
m);
g_rw_lock_writer_unlock (&demux->metadata_lock);
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 %" G_GSIZE_FORMAT
" at offset %" G_GUINT64_FORMAT, gst_buffer_get_size (buffer),
demux->offset);
if (demux->current_partition->essence_container_offset == 0)
demux->current_partition->essence_container_offset =
demux->offset - demux->current_partition->partition.this_partition -
demux->run_in;
/* TODO: parse this */
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_pad_set_component (GstMXFDemux * demux, GstMXFDemuxPad * pad,
guint i)
{
GstFlowReturn ret = GST_FLOW_OK;
GstCaps *pad_caps;
MXFMetadataSequence *sequence;
guint k;
MXFMetadataSourcePackage *source_package = NULL;
MXFMetadataTimelineTrack *source_track = NULL;
gboolean update = (pad->current_component_index != i);
pad->current_component_index = i;
sequence = pad->material_track->parent.sequence;
if (pad->current_component_index >= sequence->n_structural_components) {
GST_DEBUG_OBJECT (demux, "After last structural component");
pad->current_component_index = sequence->n_structural_components - 1;
ret = GST_FLOW_EOS;
}
GST_DEBUG_OBJECT (demux, "Switching to component %u",
pad->current_component_index);
pad->current_component =
MXF_METADATA_SOURCE_CLIP (sequence->structural_components[pad->
current_component_index]);
if (pad->current_component == NULL) {
GST_ERROR_OBJECT (demux, "No such structural component");
return GST_FLOW_ERROR;
}
if (!pad->current_component->source_package
|| !pad->current_component->source_package->top_level
|| !MXF_METADATA_GENERIC_PACKAGE (pad->current_component->
source_package)->tracks) {
GST_ERROR_OBJECT (demux, "Invalid component");
return GST_FLOW_ERROR;
}
source_package = pad->current_component->source_package;
for (k = 0; k < source_package->parent.n_tracks; k++) {
MXFMetadataTrack *tmp = source_package->parent.tracks[k];
if (tmp->track_id == pad->current_component->source_track_id) {
source_track = MXF_METADATA_TIMELINE_TRACK (tmp);
break;
}
}
if (!source_track) {
GST_ERROR_OBJECT (demux, "No source track found");
return GST_FLOW_ERROR;
}
pad->current_essence_track = NULL;
for (k = 0; k < demux->essence_tracks->len; k++) {
GstMXFDemuxEssenceTrack *tmp =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, k);
if (tmp->source_package == source_package &&
tmp->source_track == source_track) {
pad->current_essence_track = tmp;
break;
}
}
if (!pad->current_essence_track) {
GST_ERROR_OBJECT (demux, "No corresponding essence track found");
return GST_FLOW_ERROR;
}
if (!source_package->descriptor) {
GST_ERROR_OBJECT (demux, "Source package has no descriptors");
return GST_FLOW_ERROR;
}
if (!source_track->parent.descriptor) {
GST_ERROR_OBJECT (demux, "No descriptor found for track");
return GST_FLOW_ERROR;
}
if (source_track->edit_rate.n <= 0 || source_track->edit_rate.d <= 0) {
GST_ERROR_OBJECT (demux, "Source track has invalid edit rate");
return GST_FLOW_ERROR;
}
pad->current_component_start_position = 0;
for (k = 0; k < i; k++) {
pad->current_component_start_position +=
MXF_METADATA_SOURCE_CLIP (sequence->structural_components[k])->
parent.duration;
}
if (pad->current_component->parent.duration >= -1)
pad->current_component_duration = pad->current_component->parent.duration;
else
pad->current_component_duration = -1;
if (pad->material_track->edit_rate.n != source_track->edit_rate.n ||
pad->material_track->edit_rate.d != source_track->edit_rate.d) {
pad->current_component_start +=
gst_util_uint64_scale (pad->current_component->start_position,
source_track->edit_rate.n * pad->material_track->edit_rate.d,
source_track->edit_rate.d * pad->material_track->edit_rate.n);
if (pad->current_component_duration != -1)
pad->current_component_duration =
gst_util_uint64_scale (pad->current_component_duration,
source_track->edit_rate.n * pad->material_track->edit_rate.d,
source_track->edit_rate.d * pad->material_track->edit_rate.n);
} else {
pad->current_component_start += pad->current_component->start_position;
}
pad->current_essence_track_position = pad->current_component_start;
pad_caps = gst_pad_get_current_caps (GST_PAD_CAST (pad));
if (!pad_caps
|| !gst_caps_is_equal (pad_caps, pad->current_essence_track->caps)) {
gst_pad_set_caps (GST_PAD_CAST (pad), pad->current_essence_track->caps);
}
if (pad_caps)
gst_caps_unref (pad_caps);
if (update) {
if (pad->tags) {
if (pad->current_essence_track->tags)
gst_tag_list_insert (pad->tags, pad->current_essence_track->tags,
GST_TAG_MERGE_REPLACE);
} else {
if (pad->current_essence_track->tags)
pad->tags = gst_tag_list_copy (pad->current_essence_track->tags);
}
}
if (ret == GST_FLOW_EOS) {
pad->current_essence_track_position += pad->current_component_duration;
}
return ret;
}
static GstFlowReturn
gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer, gboolean peek)
{
GstFlowReturn ret = GST_FLOW_OK;
guint32 track_number;
guint i;
GstBuffer *inbuf = NULL;
GstBuffer *outbuf = NULL;
GstMXFDemuxEssenceTrack *etrack = NULL;
gboolean keyframe = TRUE;
/* As in GstMXFDemuxIndex */
guint64 pts = G_MAXUINT64, dts = G_MAXUINT64;
GST_DEBUG_OBJECT (demux,
"Handling generic container essence element of size %" G_GSIZE_FORMAT
" at offset %" G_GUINT64_FORMAT, gst_buffer_get_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_partition->essence_container_offset == 0)
demux->current_partition->essence_container_offset =
demux->offset - demux->current_partition->partition.this_partition -
demux->run_in;
if (!demux->current_package) {
GST_ERROR_OBJECT (demux, "No package selected yet");
return GST_FLOW_ERROR;
}
if (demux->src->len == 0) {
GST_ERROR_OBJECT (demux, "No streams created yet");
return GST_FLOW_ERROR;
}
if (demux->essence_tracks->len == 0) {
GST_ERROR_OBJECT (demux, "No essence streams found in the metadata");
return GST_FLOW_ERROR;
}
track_number = GST_READ_UINT32_BE (&key->u[12]);
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *tmp =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (tmp->body_sid == demux->current_partition->partition.body_sid &&
(tmp->track_number == track_number || tmp->track_number == 0)) {
etrack = tmp;
break;
}
}
if (!etrack) {
GST_WARNING_OBJECT (demux,
"No essence track for this essence element found");
return GST_FLOW_OK;
}
if (etrack->position == -1) {
GST_DEBUG_OBJECT (demux,
"Unknown essence track position, looking into index");
if (etrack->offsets) {
for (i = 0; i < etrack->offsets->len; i++) {
GstMXFDemuxIndex *idx =
&g_array_index (etrack->offsets, GstMXFDemuxIndex, i);
if (idx->initialized && idx->offset != 0
&& idx->offset == demux->offset - demux->run_in) {
etrack->position = i;
break;
}
}
}
if (etrack->position == -1) {
GST_WARNING_OBJECT (demux, "Essence track position not in index");
return GST_FLOW_OK;
}
}
if (etrack->offsets && etrack->offsets->len > etrack->position) {
GstMXFDemuxIndex *index =
&g_array_index (etrack->offsets, GstMXFDemuxIndex, etrack->position);
if (index->initialized && index->offset != 0)
keyframe = index->keyframe;
if (index->initialized && index->pts != G_MAXUINT64)
pts = index->pts;
if (index->initialized && index->dts != G_MAXUINT64)
dts = index->dts;
}
/* Create subbuffer to be able to change metadata */
inbuf =
gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0,
gst_buffer_get_size (buffer));
if (!keyframe)
GST_BUFFER_FLAG_SET (inbuf, GST_BUFFER_FLAG_DELTA_UNIT);
if (etrack->handle_func) {
/* Takes ownership of inbuf */
ret =
etrack->handle_func (key, inbuf, etrack->caps,
etrack->source_track, etrack->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;
}
return ret;
}
if (outbuf)
keyframe = !GST_BUFFER_FLAG_IS_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
/* Prefer keyframe information from index tables over everything else */
if (demux->index_tables) {
GList *l;
GstMXFDemuxIndexTable *index_table = NULL;
for (l = demux->index_tables; l; l = l->next) {
GstMXFDemuxIndexTable *tmp = l->data;
if (tmp->body_sid == etrack->body_sid
&& tmp->index_sid == etrack->index_sid) {
index_table = tmp;
break;
}
}
if (index_table && index_table->offsets->len > etrack->position) {
GstMXFDemuxIndex *index =
&g_array_index (index_table->offsets, GstMXFDemuxIndex,
etrack->position);
if (index->initialized && index->offset != 0) {
keyframe = index->keyframe;
if (outbuf) {
if (keyframe)
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
}
if (index->initialized && index->pts != G_MAXUINT64)
pts = index->pts;
if (index->initialized && index->dts != G_MAXUINT64)
dts = index->dts;
}
}
if (!etrack->offsets)
etrack->offsets = g_array_new (FALSE, TRUE, sizeof (GstMXFDemuxIndex));
{
if (etrack->offsets->len > etrack->position) {
GstMXFDemuxIndex *index =
&g_array_index (etrack->offsets, GstMXFDemuxIndex, etrack->position);
index->offset = demux->offset - demux->run_in;
index->initialized = TRUE;
index->pts = pts;
index->dts = dts;
index->keyframe = keyframe;
} else if (etrack->position < G_MAXINT) {
GstMXFDemuxIndex index;
index.offset = demux->offset - demux->run_in;
index.initialized = TRUE;
index.pts = pts;
index.dts = dts;
index.keyframe = keyframe;
if (etrack->offsets->len < etrack->position)
g_array_set_size (etrack->offsets, etrack->position + 1);
g_array_insert_val (etrack->offsets, etrack->position, index);
}
}
if (peek)
goto out;
if (!outbuf) {
GST_DEBUG_OBJECT (demux, "No output buffer created");
goto out;
}
inbuf = outbuf;
outbuf = NULL;
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *pad = g_ptr_array_index (demux->src, i);
if (pad->current_essence_track != etrack)
continue;
if (pad->eos) {
GST_DEBUG_OBJECT (demux, "Pad is already EOS");
continue;
}
if (etrack->position != pad->current_essence_track_position) {
GST_DEBUG_OBJECT (demux, "Not at current component's position");
continue;
}
{
GstMXFDemuxPad *earliest = gst_mxf_demux_get_earliest_pad (demux);
if (earliest && earliest != pad && earliest->position < pad->position &&
pad->position - earliest->position > demux->max_drift) {
GST_DEBUG_OBJECT (demux, "Pad is too far ahead of time");
continue;
}
}
/* Create another subbuffer to have writable metadata */
outbuf =
gst_buffer_copy_region (inbuf, GST_BUFFER_COPY_ALL, 0,
gst_buffer_get_size (inbuf));
GST_BUFFER_DTS (outbuf) = pad->position;
if (etrack->intra_only) {
GST_BUFFER_PTS (outbuf) = pad->position;
} else if (pts != G_MAXUINT64) {
GST_BUFFER_PTS (outbuf) = gst_util_uint64_scale (pts * GST_SECOND,
pad->current_essence_track->source_track->edit_rate.d,
pad->current_essence_track->source_track->edit_rate.n);
GST_BUFFER_PTS (outbuf) +=
gst_util_uint64_scale (pad->current_component_start_position *
GST_SECOND, pad->material_track->edit_rate.d,
pad->material_track->edit_rate.n);
} else {
GST_BUFFER_PTS (outbuf) = GST_CLOCK_TIME_NONE;
}
GST_BUFFER_DURATION (outbuf) =
gst_util_uint64_scale (GST_SECOND,
pad->current_essence_track->source_track->edit_rate.d,
pad->current_essence_track->source_track->edit_rate.n);
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET_NONE;
GST_BUFFER_OFFSET_END (outbuf) = GST_BUFFER_OFFSET_NONE;
if (pad->material_track->parent.type == MXF_METADATA_TRACK_PICTURE_ESSENCE
&& pad->start_timecode.config.fps_n != 0
&& pad->start_timecode.config.fps_d != 0) {
if (etrack->intra_only) {
GstVideoTimeCode timecode = pad->start_timecode;
gst_video_time_code_add_frames (&timecode,
pad->current_material_track_position);
gst_buffer_add_video_time_code_meta (outbuf, &timecode);
} else if (pts != G_MAXUINT64) {
GstVideoTimeCode timecode = pad->start_timecode;
gst_video_time_code_add_frames (&timecode,
pad->current_component_start_position);
gst_video_time_code_add_frames (&timecode,
gst_util_uint64_scale (pts,
pad->material_track->edit_rate.n *
pad->current_essence_track->source_track->edit_rate.d,
pad->material_track->edit_rate.d *
pad->current_essence_track->source_track->edit_rate.n));
gst_buffer_add_video_time_code_meta (outbuf, &timecode);
}
}
/* Update accumulated error and compensate */
{
guint64 abs_error =
(GST_SECOND * pad->current_essence_track->source_track->edit_rate.d) %
pad->current_essence_track->source_track->edit_rate.n;
pad->position_accumulated_error +=
((gdouble) abs_error) /
((gdouble) pad->current_essence_track->source_track->edit_rate.n);
}
if (pad->position_accumulated_error >= 1.0) {
GST_BUFFER_DURATION (outbuf) += 1;
pad->position_accumulated_error -= 1.0;
}
if (pad->need_segment) {
GstEvent *e;
if (demux->close_seg_event)
gst_pad_push_event (GST_PAD_CAST (pad),
gst_event_ref (demux->close_seg_event));
e = gst_event_new_segment (&demux->segment);
gst_event_set_seqnum (e, demux->seqnum);
gst_pad_push_event (GST_PAD_CAST (pad), e);
pad->need_segment = FALSE;
}
if (pad->tags) {
gst_pad_push_event (GST_PAD_CAST (pad), gst_event_new_tag (pad->tags));
pad->tags = NULL;
}
pad->position += GST_BUFFER_DURATION (outbuf);
pad->current_material_track_position++;
GST_DEBUG_OBJECT (demux,
"Pushing buffer of size %" G_GSIZE_FORMAT " for track %u: pts %"
GST_TIME_FORMAT " dts %" GST_TIME_FORMAT " duration %" GST_TIME_FORMAT
" position %" G_GUINT64_FORMAT, gst_buffer_get_size (outbuf),
pad->material_track->parent.track_id,
GST_TIME_ARGS (GST_BUFFER_PTS (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DTS (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)),
pad->current_essence_track_position);
if (pad->discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
pad->discont = FALSE;
}
ret = gst_pad_push (GST_PAD_CAST (pad), outbuf);
outbuf = NULL;
ret = gst_flow_combiner_update_flow (demux->flowcombiner, ret);
GST_LOG_OBJECT (demux, "combined return %s", gst_flow_get_name (ret));
if (pad->position > demux->segment.position)
demux->segment.position = pad->position;
if (ret != GST_FLOW_OK)
goto out;
pad->current_essence_track_position++;
if (pad->current_component) {
if (pad->current_component_duration > 0 &&
pad->current_essence_track_position - pad->current_component_start
>= pad->current_component_duration) {
GST_DEBUG_OBJECT (demux, "Switching to next component");
ret =
gst_mxf_demux_pad_set_component (demux, pad,
pad->current_component_index + 1);
if (ret != GST_FLOW_OK && ret != GST_FLOW_EOS) {
GST_ERROR_OBJECT (demux, "Switching component failed");
}
} else if (etrack->duration > 0
&& pad->current_essence_track_position >= etrack->duration) {
GST_DEBUG_OBJECT (demux,
"Current component position after end of essence track");
ret = GST_FLOW_EOS;
}
} else if (etrack->duration > 0
&& pad->current_essence_track_position == etrack->duration) {
GST_DEBUG_OBJECT (demux, "At the end of the essence track");
ret = GST_FLOW_EOS;
}
if (ret == GST_FLOW_EOS) {
GstEvent *e;
GST_DEBUG_OBJECT (demux, "EOS for track");
pad->eos = TRUE;
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
gst_pad_push_event (GST_PAD_CAST (pad), e);
ret = GST_FLOW_OK;
}
if (ret != GST_FLOW_OK)
goto out;
}
out:
if (inbuf)
gst_buffer_unref (inbuf);
if (outbuf)
gst_buffer_unref (outbuf);
etrack->position++;
return ret;
}
static void
read_partition_header (GstMXFDemux * demux)
{
GstBuffer *buf;
MXFUL key;
guint read;
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf, &read)
!= GST_FLOW_OK)
return;
if (!mxf_is_partition_pack (&key)) {
gst_buffer_unref (buf);
return;
}
if (gst_mxf_demux_handle_partition_pack (demux, &key, buf) != GST_FLOW_OK) {
gst_buffer_unref (buf);
return;
}
demux->offset += read;
gst_buffer_unref (buf);
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf, &read)
!= GST_FLOW_OK)
return;
while (mxf_is_fill (&key)) {
demux->offset += read;
gst_buffer_unref (buf);
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf, &read)
!= GST_FLOW_OK)
return;
}
if (!mxf_is_index_table_segment (&key)
&& demux->current_partition->partition.header_byte_count) {
gst_buffer_unref (buf);
demux->offset += demux->current_partition->partition.header_byte_count;
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf, &read)
!= GST_FLOW_OK)
return;
}
while (mxf_is_fill (&key)) {
demux->offset += read;
gst_buffer_unref (buf);
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf, &read)
!= GST_FLOW_OK)
return;
}
if (demux->current_partition->partition.index_byte_count
&& mxf_is_index_table_segment (&key)) {
guint64 index_end_offset =
demux->offset + demux->current_partition->partition.index_byte_count;
while (demux->offset < index_end_offset) {
if (mxf_is_index_table_segment (&key)) {
gst_mxf_demux_handle_index_table_segment (demux, &key, buf,
demux->offset);
}
demux->offset += read;
gst_buffer_unref (buf);
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf,
&read)
!= GST_FLOW_OK)
return;
}
}
while (mxf_is_fill (&key)) {
demux->offset += read;
gst_buffer_unref (buf);
if (gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buf, &read)
!= GST_FLOW_OK)
return;
}
if (mxf_is_generic_container_system_item (&key) ||
mxf_is_generic_container_essence_element (&key) ||
mxf_is_avid_essence_container_essence_element (&key)) {
if (demux->current_partition->essence_container_offset == 0)
demux->current_partition->essence_container_offset =
demux->offset - demux->current_partition->partition.this_partition -
demux->run_in;
}
gst_buffer_unref (buf);
}
static GstFlowReturn
gst_mxf_demux_handle_random_index_pack (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer)
{
guint i;
GList *l;
GstMapInfo map;
gboolean ret;
GST_DEBUG_OBJECT (demux,
"Handling random index pack of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (buffer), demux->offset);
if (demux->random_index_pack) {
GST_DEBUG_OBJECT (demux, "Already parsed random index pack");
return GST_FLOW_OK;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
ret =
mxf_random_index_pack_parse (key, map.data, map.size,
&demux->random_index_pack);
gst_buffer_unmap (buffer, &map);
if (!ret) {
GST_ERROR_OBJECT (demux, "Parsing random index pack failed");
return GST_FLOW_ERROR;
}
for (i = 0; i < demux->random_index_pack->len; i++) {
GstMXFDemuxPartition *p = NULL;
MXFRandomIndexPackEntry *e =
&g_array_index (demux->random_index_pack, MXFRandomIndexPackEntry, i);
if (e->offset < demux->run_in) {
GST_ERROR_OBJECT (demux, "Invalid random index pack entry");
return GST_FLOW_ERROR;
}
for (l = demux->partitions; l; l = l->next) {
GstMXFDemuxPartition *tmp = l->data;
if (tmp->partition.this_partition + demux->run_in == e->offset) {
p = tmp;
break;
}
}
if (!p) {
p = g_new0 (GstMXFDemuxPartition, 1);
p->partition.this_partition = e->offset - demux->run_in;
p->partition.body_sid = e->body_sid;
demux->partitions =
g_list_insert_sorted (demux->partitions, p,
(GCompareFunc) gst_mxf_demux_partition_compare);
}
}
for (l = demux->partitions; l; l = l->next) {
GstMXFDemuxPartition *a, *b;
if (l->next == NULL)
break;
a = l->data;
b = l->next->data;
b->partition.prev_partition = a->partition.this_partition;
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mxf_demux_handle_index_table_segment (GstMXFDemux * demux,
const MXFUL * key, GstBuffer * buffer, guint64 offset)
{
MXFIndexTableSegment *segment;
GstMapInfo map;
gboolean ret;
GST_DEBUG_OBJECT (demux,
"Handling index table segment of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (buffer), offset);
segment = g_new0 (MXFIndexTableSegment, 1);
gst_buffer_map (buffer, &map, GST_MAP_READ);
ret = mxf_index_table_segment_parse (key, segment, map.data, map.size);
gst_buffer_unmap (buffer, &map);
if (!ret) {
GST_ERROR_OBJECT (demux, "Parsing index table segment failed");
g_free (segment);
return GST_FLOW_ERROR;
}
demux->pending_index_table_segments =
g_list_prepend (demux->pending_index_table_segments, 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;
GstMapInfo map;
#ifndef GST_DISABLE_GST_DEBUG
gchar str[48];
#endif
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;
gst_buffer_map (buffer, &map, GST_MAP_READ);
memcpy (key, map.data, 16);
GST_DEBUG_OBJECT (demux, "Got KLV packet with key %s", mxf_ul_to_string (key,
str));
/* Decode BER encoded packet length */
if ((map.data[16] & 0x80) == 0) {
length = map.data[16];
data_offset = 17;
} else {
guint slen = map.data[16] & 0x7f;
data_offset = 16 + 1 + slen;
gst_buffer_unmap (buffer, &map);
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;
gst_buffer_map (buffer, &map, GST_MAP_READ);
data = map.data;
length = 0;
while (slen) {
length = (length << 8) | *data;
data++;
slen--;
}
}
gst_buffer_unmap (buffer, &map);
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;
}
GST_DEBUG_OBJECT (demux, "KLV packet with key %s has length "
"%" G_GUINT64_FORMAT, mxf_ul_to_string (key, str), length);
/* 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;
}
static void
gst_mxf_demux_pull_random_index_pack (GstMXFDemux * demux)
{
GstBuffer *buffer;
gint64 filesize = -1;
GstFormat fmt = GST_FORMAT_BYTES;
guint32 pack_size;
guint64 old_offset = demux->offset;
MXFUL key;
GstMapInfo map;
GstFlowReturn flow_ret;
if (!gst_pad_peer_query_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);
buffer = NULL;
if (gst_mxf_demux_pull_range (demux, filesize - 4, 4, &buffer) != GST_FLOW_OK) {
GST_DEBUG_OBJECT (demux, "Failed pulling last 4 bytes");
return;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
pack_size = GST_READ_UINT32_BE (map.data);
gst_buffer_unmap (buffer, &map);
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;
}
buffer = NULL;
if (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;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
memcpy (&key, map.data, 16);
gst_buffer_unmap (buffer, &map);
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 (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;
}
flow_ret = gst_mxf_demux_handle_random_index_pack (demux, &key, buffer);
gst_buffer_unref (buffer);
demux->offset = old_offset;
if (flow_ret == GST_FLOW_OK && !demux->index_table_segments_collected) {
collect_index_table_segments (demux);
demux->index_table_segments_collected = TRUE;
}
}
static void
gst_mxf_demux_parse_footer_metadata (GstMXFDemux * demux)
{
guint64 old_offset = demux->offset;
MXFUL key;
GstBuffer *buffer = NULL;
guint read = 0;
GstFlowReturn flow = GST_FLOW_OK;
GstMXFDemuxPartition *old_partition = demux->current_partition;
demux->current_partition = NULL;
gst_mxf_demux_reset_metadata (demux);
if (demux->footer_partition_pack_offset != 0) {
demux->offset = demux->run_in + demux->footer_partition_pack_offset;
} else {
MXFRandomIndexPackEntry *entry =
&g_array_index (demux->random_index_pack, MXFRandomIndexPackEntry,
demux->random_index_pack->len - 1);
demux->offset = entry->offset;
}
next_try:
flow =
gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
&read);
if (G_UNLIKELY (flow != GST_FLOW_OK))
goto out;
if (!mxf_is_partition_pack (&key))
goto out;
if (gst_mxf_demux_handle_partition_pack (demux, &key, buffer) != GST_FLOW_OK)
goto out;
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
if (demux->current_partition->partition.header_byte_count == 0) {
if (demux->current_partition->partition.this_partition == 0)
goto out;
demux->offset =
demux->run_in + demux->current_partition->partition.prev_partition;
goto next_try;
}
while (TRUE) {
flow =
gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
&read);
if (G_UNLIKELY (flow != GST_FLOW_OK)) {
if (!demux->current_partition->partition.prev_partition)
goto out;
demux->offset =
demux->run_in + demux->current_partition->partition.prev_partition;
goto next_try;
}
if (mxf_is_fill (&key)) {
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
} else if (mxf_is_primer_pack (&key)) {
if (!demux->current_partition->primer.mappings) {
if (gst_mxf_demux_handle_primer_pack (demux, &key,
buffer) != GST_FLOW_OK) {
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
if (!demux->current_partition->partition.prev_partition)
goto out;
demux->offset =
demux->run_in +
demux->current_partition->partition.prev_partition;
goto next_try;
}
}
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
break;
} else {
gst_buffer_unref (buffer);
buffer = NULL;
if (!demux->current_partition->partition.prev_partition)
goto out;
demux->offset =
demux->run_in + demux->current_partition->partition.prev_partition;
goto next_try;
}
}
/* parse metadata */
while (demux->offset <
demux->run_in + demux->current_partition->primer.offset +
demux->current_partition->partition.header_byte_count) {
flow =
gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
&read);
if (G_UNLIKELY (flow != GST_FLOW_OK)) {
if (!demux->current_partition->partition.prev_partition)
goto out;
demux->offset =
demux->run_in + demux->current_partition->partition.prev_partition;
goto next_try;
}
if (mxf_is_metadata (&key)) {
flow = gst_mxf_demux_handle_metadata (demux, &key, buffer);
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
if (G_UNLIKELY (flow != GST_FLOW_OK)) {
gst_mxf_demux_reset_metadata (demux);
if (!demux->current_partition->partition.prev_partition)
goto out;
demux->offset =
demux->run_in + demux->current_partition->partition.prev_partition;
goto next_try;
}
} else if (mxf_is_descriptive_metadata (&key)) {
gst_mxf_demux_handle_descriptive_metadata (demux, &key, buffer);
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
} else if (mxf_is_fill (&key)) {
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
} else if (mxf_is_generic_container_system_item (&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;
break;
} else {
demux->offset += read;
gst_buffer_unref (buffer);
buffer = NULL;
}
}
/* resolve references etc */
if (!demux->preface || gst_mxf_demux_resolve_references (demux) !=
GST_FLOW_OK || gst_mxf_demux_update_tracks (demux) != GST_FLOW_OK) {
demux->current_partition->parsed_metadata = TRUE;
if (!demux->current_partition->partition.prev_partition)
goto out;
demux->offset =
demux->run_in + demux->current_partition->partition.prev_partition;
goto next_try;
}
out:
if (buffer)
gst_buffer_unref (buffer);
demux->offset = old_offset;
demux->current_partition = old_partition;
}
static GstFlowReturn
gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key,
GstBuffer * buffer, gboolean peek)
{
#ifndef GST_DISABLE_GST_DEBUG
gchar key_str[48];
#endif
GstFlowReturn ret = GST_FLOW_OK;
if (demux->update_metadata
&& demux->preface
&& (demux->offset >=
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_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) {
goto beach;
}
} else if (demux->metadata_resolved && demux->requested_package_string) {
if ((ret = gst_mxf_demux_update_tracks (demux)) != GST_FLOW_OK) {
goto beach;
}
}
if (!mxf_is_mxf_packet (key)) {
GST_WARNING_OBJECT (demux,
"Skipping non-MXF packet of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT ", key: %s", gst_buffer_get_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);
/* If this partition contains the start of an essence container
* set the positions of all essence streams to 0
*/
if (ret == GST_FLOW_OK && demux->current_partition
&& demux->current_partition->partition.body_sid != 0
&& demux->current_partition->partition.body_offset == 0) {
guint i;
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (etrack->body_sid != demux->current_partition->partition.body_sid)
continue;
etrack->position = 0;
}
}
} 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) ||
mxf_is_avid_essence_container_essence_element (key)) {
ret =
gst_mxf_demux_handle_generic_container_essence_element (demux, key,
buffer, peek);
} else if (mxf_is_random_index_pack (key)) {
ret = gst_mxf_demux_handle_random_index_pack (demux, key, buffer);
if (ret == GST_FLOW_OK && demux->random_access
&& !demux->index_table_segments_collected) {
collect_index_table_segments (demux);
demux->index_table_segments_collected = TRUE;
}
} else if (mxf_is_index_table_segment (key)) {
ret =
gst_mxf_demux_handle_index_table_segment (demux, key, buffer,
demux->offset);
} else if (mxf_is_fill (key)) {
GST_DEBUG_OBJECT (demux,
"Skipping filler packet of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (buffer), demux->offset);
} else {
GST_DEBUG_OBJECT (demux,
"Skipping unknown packet of size %" G_GSIZE_FORMAT " at offset %"
G_GUINT64_FORMAT ", key: %s", gst_buffer_get_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->current_partition
&& demux->current_partition->partition.type == MXF_PARTITION_PACK_HEADER
&& (!demux->current_partition->partition.closed
|| !demux->current_partition->partition.complete)
&& (demux->footer_partition_pack_offset != 0 || demux->random_index_pack)) {
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;
if (demux->current_partition->partition.body_sid != 0 &&
demux->current_partition->partition.body_offset == 0) {
guint i;
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (etrack->body_sid != demux->current_partition->partition.body_sid)
continue;
etrack->position = 0;
}
}
}
beach:
return ret;
}
static void
gst_mxf_demux_set_partition_for_offset (GstMXFDemux * demux, guint64 offset)
{
GList *l;
/* This partition will already be parsed, otherwise
* the position wouldn't be in the index */
for (l = demux->partitions; l; l = l->next) {
GstMXFDemuxPartition *p = l->data;
if (p->partition.this_partition + demux->run_in <= offset)
demux->current_partition = p;
}
}
static guint64
find_offset (GArray * offsets, gint64 * position, gboolean keyframe)
{
GstMXFDemuxIndex *idx;
guint64 current_offset = -1;
gint64 current_position = *position;
if (!offsets || offsets->len <= *position)
return -1;
idx = &g_array_index (offsets, GstMXFDemuxIndex, *position);
if (idx->offset != 0 && (!keyframe || idx->keyframe)) {
current_offset = idx->offset;
} else if (idx->offset != 0) {
current_position--;
while (current_position >= 0) {
idx = &g_array_index (offsets, GstMXFDemuxIndex, current_position);
if (idx->offset == 0) {
break;
} else if (!idx->keyframe) {
current_position--;
continue;
} else {
current_offset = idx->offset;
break;
}
}
}
if (current_offset == -1)
return -1;
*position = current_position;
return current_offset;
}
static guint64
find_closest_offset (GArray * offsets, gint64 * position, gboolean keyframe)
{
GstMXFDemuxIndex *idx;
gint64 current_position = *position;
if (!offsets || offsets->len == 0)
return -1;
current_position = MIN (current_position, offsets->len - 1);
idx = &g_array_index (offsets, GstMXFDemuxIndex, current_position);
while (idx->offset == 0 || (keyframe && !idx->keyframe)) {
current_position--;
if (current_position < 0)
break;
idx = &g_array_index (offsets, GstMXFDemuxIndex, current_position);
}
if (idx->offset != 0 && (!keyframe || idx->keyframe)) {
*position = current_position;
return idx->offset;
}
return -1;
}
static guint64
gst_mxf_demux_find_essence_element (GstMXFDemux * demux,
GstMXFDemuxEssenceTrack * etrack, gint64 * position, gboolean keyframe)
{
GstFlowReturn ret = GST_FLOW_OK;
guint64 old_offset = demux->offset;
GstMXFDemuxPartition *old_partition = demux->current_partition;
gint i;
guint64 offset;
gint64 requested_position = *position;
GstMXFDemuxIndexTable *index_table = NULL;
GST_DEBUG_OBJECT (demux, "Trying to find essence element %" G_GINT64_FORMAT
" of track %u with body_sid %u (keyframe %d)", *position,
etrack->track_number, etrack->body_sid, keyframe);
if (demux->index_tables) {
GList *l;
for (l = demux->index_tables; l; l = l->next) {
GstMXFDemuxIndexTable *tmp = l->data;
if (tmp->body_sid == etrack->body_sid
&& tmp->index_sid == etrack->index_sid) {
index_table = tmp;
break;
}
}
}
from_index:
if (etrack->duration > 0 && *position >= etrack->duration) {
GST_WARNING_OBJECT (demux, "Position after end of essence track");
return -1;
}
/* First try to find an offset in our index */
offset = find_offset (etrack->offsets, position, keyframe);
if (offset != -1) {
GST_DEBUG_OBJECT (demux,
"Found edit unit %" G_GINT64_FORMAT " for %" G_GINT64_FORMAT
" in generated index at offset %" G_GUINT64_FORMAT, *position,
requested_position, offset);
return offset;
}
GST_DEBUG_OBJECT (demux, "Not found in index");
if (!demux->random_access) {
offset = find_closest_offset (etrack->offsets, position, keyframe);
if (offset != -1) {
GST_DEBUG_OBJECT (demux,
"Starting with edit unit %" G_GINT64_FORMAT " for %" G_GINT64_FORMAT
" in generated index at offset %" G_GUINT64_FORMAT, *position,
requested_position, offset);
return offset;
}
if (index_table) {
offset = find_closest_offset (index_table->offsets, position, keyframe);
if (offset != -1) {
GST_DEBUG_OBJECT (demux,
"Starting with edit unit %" G_GINT64_FORMAT " for %" G_GINT64_FORMAT
" in index at offset %" G_GUINT64_FORMAT, *position,
requested_position, offset);
return offset;
}
}
} else if (demux->random_access) {
gint64 index_start_position = *position;
demux->offset = demux->run_in;
offset =
find_closest_offset (etrack->offsets, &index_start_position, FALSE);
if (offset != -1) {
demux->offset = offset + demux->run_in;
GST_DEBUG_OBJECT (demux,
"Starting with edit unit %" G_GINT64_FORMAT " for %" G_GINT64_FORMAT
" in generated index at offset %" G_GUINT64_FORMAT,
index_start_position, requested_position, offset);
} else {
index_start_position = -1;
}
if (index_table) {
gint64 tmp_position = *position;
offset = find_closest_offset (index_table->offsets, &tmp_position, TRUE);
if (offset != -1 && tmp_position > index_start_position) {
demux->offset = offset + demux->run_in;
index_start_position = tmp_position;
GST_DEBUG_OBJECT (demux,
"Starting with edit unit %" G_GINT64_FORMAT " for %" G_GINT64_FORMAT
" in index at offset %" G_GUINT64_FORMAT, index_start_position,
requested_position, offset);
}
}
gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (index_start_position != -1 && t == etrack)
t->position = index_start_position;
else
t->position = (demux->offset == demux->run_in) ? 0 : -1;
}
/* Else peek at all essence elements and complete our
* index until we find the requested element
*/
while (ret == GST_FLOW_OK) {
GstBuffer *buffer = NULL;
MXFUL key;
guint read = 0;
ret =
gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
&read);
if (ret == GST_FLOW_EOS) {
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
i);
if (t->position > 0)
t->duration = t->position;
}
/* For the searched track this is really our position */
etrack->duration = etrack->position;
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
if (!p->eos
&& p->current_essence_track_position >=
p->current_essence_track->duration) {
GstEvent *e;
p->eos = TRUE;
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
gst_pad_push_event (GST_PAD_CAST (p), e);
}
}
}
if (G_UNLIKELY (ret != GST_FLOW_OK) && etrack->position <= *position) {
demux->offset = old_offset;
demux->current_partition = old_partition;
break;
} else if (G_UNLIKELY (ret == GST_FLOW_OK)) {
ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer, TRUE);
gst_buffer_unref (buffer);
}
/* If we found the position read it from the index again */
if (((ret == GST_FLOW_OK && etrack->position == *position + 2) ||
(ret == GST_FLOW_EOS && etrack->position == *position + 1))
&& etrack->offsets && etrack->offsets->len > *position
&& g_array_index (etrack->offsets, GstMXFDemuxIndex,
*position).offset != 0) {
GST_DEBUG_OBJECT (demux, "Found at offset %" G_GUINT64_FORMAT,
demux->offset);
demux->offset = old_offset;
demux->current_partition = old_partition;
goto from_index;
}
demux->offset += read;
}
demux->offset = old_offset;
demux->current_partition = old_partition;
GST_DEBUG_OBJECT (demux, "Not found in this file");
}
return -1;
}
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;
if (demux->src->len > 0) {
if (!gst_mxf_demux_get_earliest_pad (demux)) {
ret = GST_FLOW_EOS;
GST_DEBUG_OBJECT (demux, "All tracks are EOS");
goto beach;
}
}
ret =
gst_mxf_demux_pull_klv_packet (demux, demux->offset, &key, &buffer,
&read);
if (ret == GST_FLOW_EOS && demux->src->len > 0) {
guint i;
GstMXFDemuxPad *p = NULL;
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (t->position > 0)
t->duration = t->position;
}
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
if (!p->eos
&& p->current_essence_track_position >=
p->current_essence_track->duration) {
GstEvent *e;
p->eos = TRUE;
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
gst_pad_push_event (GST_PAD_CAST (p), e);
}
}
while ((p = gst_mxf_demux_get_earliest_pad (demux))) {
guint64 offset;
gint64 position;
position = p->current_essence_track_position;
offset =
gst_mxf_demux_find_essence_element (demux, p->current_essence_track,
&position, FALSE);
if (offset == -1) {
GstEvent *e;
GST_ERROR_OBJECT (demux, "Failed to find offset for essence track");
p->eos = TRUE;
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
gst_pad_push_event (GST_PAD_CAST (p), e);
continue;
}
demux->offset = offset + demux->run_in;
gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
p->current_essence_track->position = position;
ret = GST_FLOW_OK;
goto beach;
}
}
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer, FALSE);
demux->offset += read;
if (ret == GST_FLOW_OK && demux->src->len > 0
&& demux->essence_tracks->len > 0) {
GstMXFDemuxPad *earliest = NULL;
/* We allow time drifts of at most 500ms */
while ((earliest = gst_mxf_demux_get_earliest_pad (demux)) &&
demux->segment.position - earliest->position > demux->max_drift) {
guint64 offset;
gint64 position;
GST_WARNING_OBJECT (demux,
"Found synchronization issue -- trying to solve");
position = earliest->current_essence_track_position;
/* FIXME: This can probably be improved by using the
* offset of position-1 if it's in the same partition
* or the start of the position otherwise.
* This way we won't skip elements from the same essence
* container as etrack->position
*/
offset =
gst_mxf_demux_find_essence_element (demux,
earliest->current_essence_track, &position, FALSE);
if (offset == -1) {
GstEvent *e;
GST_WARNING_OBJECT (demux,
"Failed to find offset for late essence track");
earliest->eos = TRUE;
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
gst_pad_push_event (GST_PAD_CAST (earliest), e);
continue;
}
demux->offset = offset + demux->run_in;
gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
earliest->current_essence_track->position = position;
break;
}
}
beach:
if (buffer)
gst_buffer_unref (buffer);
return ret;
}
static void
gst_mxf_demux_loop (GstPad * pad)
{
GstMXFDemux *demux = NULL;
GstFlowReturn flow = GST_FLOW_OK;
GstMapInfo map;
gboolean res;
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 = NULL;
if ((flow =
gst_mxf_demux_pull_range (demux, demux->offset, 16,
&buffer)) != GST_FLOW_OK)
break;
gst_buffer_map (buffer, &map, GST_MAP_READ);
res = mxf_is_header_partition_pack ((const MXFUL *) map.data);
gst_buffer_unmap (buffer, &map);
if (res) {
GST_DEBUG_OBJECT (demux,
"Found header partition pack at offset %" G_GUINT64_FORMAT,
demux->offset);
demux->run_in = demux->offset;
gst_buffer_unref (buffer);
break;
}
demux->offset++;
gst_buffer_unref (buffer);
}
if (G_UNLIKELY (flow != GST_FLOW_OK))
goto pause;
if (G_UNLIKELY (demux->run_in == -1)) {
GST_ERROR_OBJECT (demux, "No valid header partition pack found");
flow = 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 */
flow = gst_mxf_demux_pull_and_handle_klv_packet (demux);
/* pause if something went wrong */
if (G_UNLIKELY (flow != GST_FLOW_OK))
goto pause;
/* check EOS condition */
if ((demux->segment.flags & GST_SEEK_FLAG_SEGMENT) &&
(demux->segment.stop != -1) &&
(demux->segment.position >= demux->segment.stop)) {
guint i;
gboolean eos = TRUE;
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
if (!p->eos && p->position < demux->segment.stop) {
eos = FALSE;
break;
}
}
if (eos) {
flow = GST_FLOW_EOS;
goto pause;
}
}
gst_object_unref (demux);
return;
pause:
{
const gchar *reason = gst_flow_get_name (flow);
GST_LOG_OBJECT (demux, "pausing task, reason %s", reason);
gst_pad_pause_task (pad);
if (flow == GST_FLOW_EOS) {
/* perform EOS logic */
if (demux->src->len == 0) {
GST_ELEMENT_ERROR (demux, STREAM, WRONG_TYPE,
("This stream contains no data."),
("got eos and didn't find any streams"));
} else if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gint64 stop;
GstMessage *m;
GstEvent *e;
/* 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");
m = gst_message_new_segment_done (GST_OBJECT_CAST (demux),
GST_FORMAT_TIME, stop);
gst_message_set_seqnum (m, demux->seqnum);
gst_element_post_message (GST_ELEMENT_CAST (demux), m);
e = gst_event_new_segment_done (GST_FORMAT_TIME, stop);
gst_event_set_seqnum (e, demux->seqnum);
gst_mxf_demux_push_src_event (demux, e);
} else {
GstEvent *e;
/* normal playback, send EOS to all linked pads */
GST_LOG_OBJECT (demux, "Sending EOS, at end of stream");
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
if (!gst_mxf_demux_push_src_event (demux, e)) {
GST_WARNING_OBJECT (demux, "failed pushing EOS on streams");
}
}
} else if (flow == GST_FLOW_NOT_LINKED || flow < GST_FLOW_EOS) {
GstEvent *e;
GST_ELEMENT_FLOW_ERROR (demux, flow);
e = gst_event_new_eos ();
gst_event_set_seqnum (e, demux->seqnum);
gst_mxf_demux_push_src_event (demux, e);
}
gst_object_unref (demux);
return;
}
}
static GstFlowReturn
gst_mxf_demux_chain (GstPad * pad, GstObject * parent, 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;
gboolean res;
#ifndef GST_DISABLE_GST_DEBUG
gchar str[48];
#endif
demux = GST_MXF_DEMUX (parent);
GST_LOG_OBJECT (demux,
"received buffer of %" G_GSIZE_FORMAT " bytes at offset %"
G_GUINT64_FORMAT, gst_buffer_get_size (inbuf), GST_BUFFER_OFFSET (inbuf));
if (demux->src->len > 0) {
if (!gst_mxf_demux_get_earliest_pad (demux)) {
ret = GST_FLOW_EOS;
GST_DEBUG_OBJECT (demux, "All tracks are EOS");
return ret;
}
}
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");
if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
demux->offset = GST_BUFFER_OFFSET (inbuf);
gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
} else if (demux->current_partition == NULL) {
gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
}
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_FLUSHING;
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_map (demux->adapter, 16);
res = mxf_is_header_partition_pack ((const MXFUL *) data);
gst_adapter_unmap (demux->adapter);
if (res) {
GST_DEBUG_OBJECT (demux,
"Found header partition pack at offset %" G_GUINT64_FORMAT,
demux->offset);
demux->run_in = demux->offset;
break;
}
gst_adapter_flush (demux->adapter, 1);
demux->offset++;
}
} else if (demux->offset < demux->run_in) {
guint64 flush = MIN (gst_adapter_available (demux->adapter),
demux->run_in - demux->offset);
gst_adapter_flush (demux->adapter, flush);
demux->offset += flush;
continue;
}
/* 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_map (demux->adapter, 17);
memcpy (&key, data, 16);
GST_DEBUG_OBJECT (demux, "Got KLV packet with key %s",
mxf_ul_to_string (&key, str));
/* 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;
gst_adapter_unmap (demux->adapter);
/* 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_map (demux->adapter, 17 + slen);
data += 17;
length = 0;
while (slen) {
length = (length << 8) | *data;
data++;
slen--;
}
}
gst_adapter_unmap (demux->adapter);
/* 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;
}
GST_DEBUG_OBJECT (demux, "KLV packet with key %s has length "
"%" G_GUINT64_FORMAT, mxf_ul_to_string (&key, str), length);
if (gst_adapter_available (demux->adapter) < offset + length)
break;
gst_adapter_flush (demux->adapter, offset);
if (length > 0) {
buffer = gst_adapter_take_buffer (demux->adapter, length);
ret = gst_mxf_demux_handle_klv_packet (demux, &key, buffer, FALSE);
gst_buffer_unref (buffer);
}
demux->offset += offset + length;
}
return ret;
}
static void
gst_mxf_demux_pad_set_position (GstMXFDemux * demux, GstMXFDemuxPad * p,
GstClockTime start)
{
guint i;
guint64 sum = 0;
MXFMetadataSourceClip *clip = NULL;
if (!p->current_component) {
p->current_essence_track_position =
gst_util_uint64_scale (start, p->material_track->edit_rate.n,
p->material_track->edit_rate.d * GST_SECOND);
if (p->current_essence_track_position >= p->current_essence_track->duration
&& p->current_essence_track->duration > 0) {
p->current_essence_track_position = p->current_essence_track->duration;
p->position =
gst_util_uint64_scale (p->current_essence_track->duration,
p->material_track->edit_rate.d * GST_SECOND,
p->material_track->edit_rate.n);
} else {
p->position = start;
}
p->position_accumulated_error = 0.0;
p->current_material_track_position = p->current_essence_track_position;
return;
}
for (i = 0; i < p->material_track->parent.sequence->n_structural_components;
i++) {
clip =
MXF_METADATA_SOURCE_CLIP (p->material_track->parent.sequence->
structural_components[i]);
if (clip->parent.duration <= 0)
break;
sum += clip->parent.duration;
if (gst_util_uint64_scale (sum, p->material_track->edit_rate.d * GST_SECOND,
p->material_track->edit_rate.n) > start)
break;
}
if (i == p->material_track->parent.sequence->n_structural_components) {
p->position =
gst_util_uint64_scale (sum, p->material_track->edit_rate.d * GST_SECOND,
p->material_track->edit_rate.n);
p->position_accumulated_error = 0.0;
p->current_material_track_position = sum;
gst_mxf_demux_pad_set_component (demux, p, i);
return;
}
if (clip->parent.duration > 0)
sum -= clip->parent.duration;
start -=
gst_util_uint64_scale (sum, p->material_track->edit_rate.d * GST_SECOND,
p->material_track->edit_rate.n);
gst_mxf_demux_pad_set_component (demux, p, i);
{
gint64 essence_offset = gst_util_uint64_scale (start,
p->current_essence_track->source_track->edit_rate.n,
p->current_essence_track->source_track->edit_rate.d * GST_SECOND);
p->current_essence_track_position += essence_offset;
p->position = gst_util_uint64_scale (sum,
GST_SECOND * p->material_track->edit_rate.d,
p->material_track->edit_rate.n) + gst_util_uint64_scale (essence_offset,
GST_SECOND * p->current_essence_track->source_track->edit_rate.d,
p->current_essence_track->source_track->edit_rate.n);
p->position_accumulated_error = 0.0;
p->current_material_track_position = sum + essence_offset;
}
if (p->current_essence_track_position >= p->current_essence_track->duration
&& p->current_essence_track->duration > 0) {
p->current_essence_track_position = p->current_essence_track->duration;
p->position =
gst_util_uint64_scale (sum + p->current_component->parent.duration,
p->material_track->edit_rate.d * GST_SECOND,
p->material_track->edit_rate.n);
p->position_accumulated_error = 0.0;
p->current_material_track_position =
sum + p->current_component->parent.duration;
}
}
static gboolean
gst_mxf_demux_seek_push (GstMXFDemux * demux, GstEvent * event)
{
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gdouble rate;
gboolean update, flush, keyframe;
GstSegment seeksegment;
guint i;
guint32 seqnum;
gst_event_parse_seek (event, &rate, &format, &flags,
&start_type, &start, &stop_type, &stop);
seqnum = gst_event_get_seqnum (event);
if (rate <= 0.0)
goto wrong_rate;
if (format != GST_FORMAT_TIME)
goto wrong_format;
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
keyframe = ! !(flags & GST_SEEK_FLAG_KEY_UNIT);
/* Work on a copy until we are sure the seek succeeded. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
GST_DEBUG_OBJECT (demux, "segment before configure %" GST_SEGMENT_FORMAT,
&demux->segment);
/* Apply the seek to our segment */
gst_segment_do_seek (&seeksegment, rate, format, flags,
start_type, start, stop_type, stop, &update);
GST_DEBUG_OBJECT (demux, "segment configured %" GST_SEGMENT_FORMAT,
&seeksegment);
if (flush || seeksegment.position != demux->segment.position) {
gboolean ret;
guint64 new_offset = -1;
GstEvent *e;
if (!demux->metadata_resolved || demux->update_metadata) {
if (gst_mxf_demux_resolve_references (demux) != GST_FLOW_OK ||
gst_mxf_demux_update_tracks (demux) != GST_FLOW_OK) {
goto unresolved_metadata;
}
}
/* Do the actual seeking */
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
gint64 position;
guint64 off;
/* Reset EOS flag on all pads */
p->eos = FALSE;
gst_mxf_demux_pad_set_position (demux, p, start);
position = p->current_essence_track_position;
off = gst_mxf_demux_find_essence_element (demux, p->current_essence_track,
&position, keyframe);
new_offset = MIN (off, new_offset);
p->discont = TRUE;
}
if (new_offset == -1)
goto no_new_offset;
new_offset += demux->run_in;
GST_DEBUG_OBJECT (demux, "generating an upstream seek at position %"
G_GUINT64_FORMAT, new_offset);
e = gst_event_new_seek (seeksegment.rate, GST_FORMAT_BYTES,
seeksegment.flags | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET,
new_offset, GST_SEEK_TYPE_NONE, 0);
gst_event_set_seqnum (e, seqnum);
ret = gst_pad_push_event (demux->sinkpad, e);
if (G_UNLIKELY (!ret)) {
goto seek_failed;
}
}
/* Tell all the stream a new segment is needed */
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
p->need_segment = TRUE;
}
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
t->position = -1;
}
/* Ok seek succeeded, take the newly configured segment */
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
return TRUE;
/* ERRORS */
wrong_format:
{
GST_WARNING_OBJECT (demux, "seeking only supported in TIME format");
return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
}
wrong_rate:
{
GST_WARNING_OBJECT (demux, "only rates > 0.0 are allowed");
return FALSE;
}
unresolved_metadata:
{
GST_WARNING_OBJECT (demux, "metadata can't be resolved");
return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
}
seek_failed:
{
GST_WARNING_OBJECT (demux, "upstream seek failed");
return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
}
no_new_offset:
{
GST_WARNING_OBJECT (demux, "can't find new offset");
return gst_pad_push_event (demux->sinkpad, gst_event_ref (event));
}
}
static void
collect_index_table_segments (GstMXFDemux * demux)
{
GList *l;
guint i;
guint64 old_offset = demux->offset;
GstMXFDemuxPartition *old_partition = demux->current_partition;
if (!demux->random_index_pack)
return;
for (i = 0; i < demux->random_index_pack->len; i++) {
MXFRandomIndexPackEntry *e =
&g_array_index (demux->random_index_pack, MXFRandomIndexPackEntry, i);
if (e->offset < demux->run_in) {
GST_ERROR_OBJECT (demux, "Invalid random index pack entry");
return;
}
demux->offset = e->offset;
read_partition_header (demux);
}
demux->offset = old_offset;
demux->current_partition = old_partition;
for (l = demux->pending_index_table_segments; l; l = l->next) {
MXFIndexTableSegment *segment = l->data;
GstMXFDemuxIndexTable *t = NULL;
GList *k;
guint64 start, end;
for (k = demux->index_tables; k; k = k->next) {
GstMXFDemuxIndexTable *tmp = k->data;
if (tmp->body_sid == segment->body_sid
&& tmp->index_sid == segment->index_sid) {
t = tmp;
break;
}
}
if (!t) {
t = g_new0 (GstMXFDemuxIndexTable, 1);
t->body_sid = segment->body_sid;
t->index_sid = segment->index_sid;
t->offsets = g_array_new (FALSE, TRUE, sizeof (GstMXFDemuxIndex));
demux->index_tables = g_list_prepend (demux->index_tables, t);
}
start = segment->index_start_position;
end = start + segment->index_duration;
if (end > G_MAXINT / sizeof (GstMXFDemuxIndex)) {
demux->index_tables = g_list_remove (demux->index_tables, t);
g_array_free (t->offsets, TRUE);
g_free (t);
continue;
}
if (t->offsets->len < end)
g_array_set_size (t->offsets, end);
for (i = 0; i < segment->n_index_entries && start + i < t->offsets->len;
i++) {
guint64 offset = segment->index_entries[i].stream_offset;
GList *m;
GstMXFDemuxPartition *offset_partition = NULL, *next_partition = NULL;
for (m = demux->partitions; m; m = m->next) {
GstMXFDemuxPartition *partition = m->data;
if (!next_partition && offset_partition)
next_partition = partition;
if (partition->partition.body_sid != t->body_sid)
continue;
if (partition->partition.body_offset > offset)
break;
offset_partition = partition;
next_partition = NULL;
}
if (offset_partition && offset >= offset_partition->partition.body_offset) {
offset =
offset_partition->partition.this_partition +
offset_partition->essence_container_offset + (offset -
offset_partition->partition.body_offset);
if (next_partition
&& offset >= next_partition->partition.this_partition) {
GST_ERROR_OBJECT (demux,
"Invalid index table segment going into next unrelated partition");
} else {
GstMXFDemuxIndex *index;
gint8 temporal_offset = segment->index_entries[i].temporal_offset;
guint64 pts_i = G_MAXUINT64;
if (temporal_offset > 0 ||
(temporal_offset < 0 && start + i >= -(gint) temporal_offset)) {
pts_i = start + i + temporal_offset;
if (t->offsets->len < pts_i)
g_array_set_size (t->offsets, pts_i + 1);
index = &g_array_index (t->offsets, GstMXFDemuxIndex, pts_i);
if (!index->initialized) {
index->initialized = TRUE;
index->offset = 0;
index->pts = G_MAXUINT64;
index->dts = G_MAXUINT64;
index->keyframe = FALSE;
}
index->pts = start + i;
}
index = &g_array_index (t->offsets, GstMXFDemuxIndex, start + i);
if (!index->initialized) {
index->initialized = TRUE;
index->offset = 0;
index->pts = G_MAXUINT64;
index->dts = G_MAXUINT64;
index->keyframe = FALSE;
}
index->offset = offset;
index->keyframe = ! !(segment->index_entries[i].flags & 0x80)
|| (segment->index_entries[i].key_frame_offset == 0);
index->dts = pts_i;
}
}
}
}
for (l = demux->pending_index_table_segments; l; l = l->next) {
MXFIndexTableSegment *s = l->data;
mxf_index_table_segment_reset (s);
g_free (s);
}
g_list_free (demux->pending_index_table_segments);
demux->pending_index_table_segments = NULL;
}
static gboolean
gst_mxf_demux_seek_pull (GstMXFDemux * demux, GstEvent * event)
{
GstClockTime keyunit_ts;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gdouble rate;
gboolean update, flush, keyframe;
GstSegment seeksegment;
guint i;
gboolean ret = TRUE;
guint32 seqnum;
gst_event_parse_seek (event, &rate, &format, &flags,
&start_type, &start, &stop_type, &stop);
seqnum = gst_event_get_seqnum (event);
if (format != GST_FORMAT_TIME)
goto wrong_format;
if (rate <= 0.0)
goto wrong_rate;
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
keyframe = ! !(flags & GST_SEEK_FLAG_KEY_UNIT);
keyunit_ts = start;
if (!demux->index_table_segments_collected) {
collect_index_table_segments (demux);
demux->index_table_segments_collected = TRUE;
}
if (flush) {
GstEvent *e;
/* Flush start up and downstream to make sure data flow and loops are
idle */
e = gst_event_new_flush_start ();
gst_event_set_seqnum (e, seqnum);
gst_mxf_demux_push_src_event (demux, gst_event_ref (e));
gst_pad_push_event (demux->sinkpad, e);
} else {
/* Pause the pulling task */
gst_pad_pause_task (demux->sinkpad);
}
/* Take the stream lock */
GST_PAD_STREAM_LOCK (demux->sinkpad);
if (flush) {
GstEvent *e;
/* Stop flushing upstream we need to pull */
e = gst_event_new_flush_stop (TRUE);
gst_event_set_seqnum (e, seqnum);
gst_pad_push_event (demux->sinkpad, e);
}
/* Work on a copy until we are sure the seek succeeded. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
GST_DEBUG_OBJECT (demux, "segment before configure %" GST_SEGMENT_FORMAT,
&demux->segment);
/* Apply the seek to our segment */
gst_segment_do_seek (&seeksegment, rate, format, flags,
start_type, start, stop_type, stop, &update);
GST_DEBUG_OBJECT (demux, "segment configured %" GST_SEGMENT_FORMAT,
&seeksegment);
if (flush || seeksegment.position != demux->segment.position) {
guint64 new_offset = -1;
if (!demux->metadata_resolved || demux->update_metadata) {
if (gst_mxf_demux_resolve_references (demux) != GST_FLOW_OK ||
gst_mxf_demux_update_tracks (demux) != GST_FLOW_OK) {
goto unresolved_metadata;
}
}
/* Do the actual seeking */
for (i = 0; i < demux->src->len; i++) {
MXFMetadataTrackType track_type = MXF_METADATA_TRACK_UNKNOWN;
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
gint64 position;
guint64 off;
if (p->material_track != NULL)
track_type = p->material_track->parent.type;
/* Reset EOS flag on all pads */
p->eos = FALSE;
gst_mxf_demux_pad_set_position (demux, p, start);
/* we always want to send data starting with a key unit */
position = p->current_essence_track_position;
off =
gst_mxf_demux_find_essence_element (demux, p->current_essence_track,
&position, TRUE);
if (off == -1) {
GST_DEBUG_OBJECT (demux, "Unable to find offset for pad %s",
GST_PAD_NAME (p));
p->current_essence_track_position = p->current_essence_track->duration;
} else {
new_offset = MIN (off, new_offset);
if (position != p->current_essence_track_position) {
p->position -=
gst_util_uint64_scale (p->current_essence_track_position -
position,
GST_SECOND * p->current_essence_track->source_track->edit_rate.d,
p->current_essence_track->source_track->edit_rate.n);
p->position_accumulated_error = 0.0;
p->current_material_track_position -=
gst_util_uint64_scale (p->current_essence_track_position -
position,
p->material_track->edit_rate.n *
p->current_essence_track->source_track->edit_rate.d,
p->material_track->edit_rate.d *
p->current_essence_track->source_track->edit_rate.n);
}
p->current_essence_track_position = position;
/* FIXME: what about DV + MPEG-TS container essence tracks? */
if (track_type == MXF_METADATA_TRACK_PICTURE_ESSENCE) {
keyunit_ts = MIN (p->position, keyunit_ts);
}
}
p->discont = TRUE;
}
gst_flow_combiner_reset (demux->flowcombiner);
if (new_offset == -1) {
GST_WARNING_OBJECT (demux, "No new offset found");
ret = FALSE;
} else {
demux->offset = new_offset + demux->run_in;
}
gst_mxf_demux_set_partition_for_offset (demux, demux->offset);
}
if (G_UNLIKELY (demux->close_seg_event)) {
gst_event_unref (demux->close_seg_event);
demux->close_seg_event = NULL;
}
if (flush) {
GstEvent *e;
/* Stop flushing, the sinks are at time 0 now */
e = gst_event_new_flush_stop (TRUE);
gst_event_set_seqnum (e, seqnum);
gst_mxf_demux_push_src_event (demux, e);
} else {
GST_DEBUG_OBJECT (demux, "closing running segment %" GST_SEGMENT_FORMAT,
&demux->segment);
/* Close the current segment for a linear playback */
demux->close_seg_event = gst_event_new_segment (&demux->segment);
gst_event_set_seqnum (demux->close_seg_event, demux->seqnum);
}
if (keyframe && keyunit_ts != start) {
GST_INFO_OBJECT (demux, "key unit seek, adjusting segment start to "
"%" GST_TIME_FORMAT, GST_TIME_ARGS (keyunit_ts));
gst_segment_do_seek (&seeksegment, rate, format, flags,
start_type, keyunit_ts, stop_type, stop, &update);
}
/* Ok seek succeeded, take the newly configured segment */
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
/* Notify about the start of a new segment */
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
GstMessage *m;
m = gst_message_new_segment_start (GST_OBJECT (demux),
demux->segment.format, demux->segment.position);
gst_message_set_seqnum (m, seqnum);
gst_element_post_message (GST_ELEMENT (demux), m);
}
/* Tell all the stream a new segment is needed */
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
p->need_segment = TRUE;
}
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
t->position = -1;
}
demux->seqnum = seqnum;
gst_pad_start_task (demux->sinkpad,
(GstTaskFunction) gst_mxf_demux_loop, demux->sinkpad, NULL);
GST_PAD_STREAM_UNLOCK (demux->sinkpad);
return ret;
/* ERRORS */
wrong_format:
{
GST_WARNING_OBJECT (demux, "seeking only supported in TIME format");
return FALSE;
}
wrong_rate:
{
GST_WARNING_OBJECT (demux, "only rates > 0.0 are allowed");
return FALSE;
}
unresolved_metadata:
{
gst_pad_start_task (demux->sinkpad,
(GstTaskFunction) gst_mxf_demux_loop, demux->sinkpad, NULL);
GST_PAD_STREAM_UNLOCK (demux->sinkpad);
GST_WARNING_OBJECT (demux, "metadata can't be resolved");
return FALSE;
}
}
static gboolean
gst_mxf_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstMXFDemux *demux = GST_MXF_DEMUX (parent);
gboolean ret;
GST_DEBUG_OBJECT (pad, "handling event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (demux->random_access)
ret = gst_mxf_demux_seek_pull (demux, event);
else
ret = gst_mxf_demux_seek_push (demux, event);
gst_event_unref (event);
break;
default:
ret = gst_pad_push_event (demux->sinkpad, event);
break;
}
return ret;
}
static gboolean
gst_mxf_demux_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstMXFDemux *demux = GST_MXF_DEMUX (parent);
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 =
format ==
GST_FORMAT_DEFAULT ? mxfpad->current_material_track_position :
mxfpad->position;
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;
g_rw_lock_reader_lock (&demux->metadata_lock);
if (!mxfpad->material_track || !mxfpad->material_track->parent.sequence) {
g_rw_lock_reader_unlock (&demux->metadata_lock);
goto error;
}
duration = mxfpad->material_track->parent.sequence->duration;
if (duration <= -1)
duration = -1;
if (duration != -1 && format == GST_FORMAT_TIME) {
if (mxfpad->material_track->edit_rate.n == 0 ||
mxfpad->material_track->edit_rate.d == 0) {
g_rw_lock_reader_unlock (&demux->metadata_lock);
goto error;
}
duration =
gst_util_uint64_scale (duration,
GST_SECOND * mxfpad->material_track->edit_rate.d,
mxfpad->material_track->edit_rate.n);
}
g_rw_lock_reader_unlock (&demux->metadata_lock);
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;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
gint64 duration;
ret = TRUE;
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
if (fmt != GST_FORMAT_TIME) {
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
goto done;
}
if (!gst_pad_query_duration (pad, GST_FORMAT_TIME, &duration)) {
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
goto done;
}
if (demux->random_access) {
gst_query_set_seeking (query, GST_FORMAT_TIME, TRUE, 0, duration);
} else {
GstQuery *peerquery = gst_query_new_seeking (GST_FORMAT_BYTES);
gboolean seekable;
seekable = gst_pad_peer_query (demux->sinkpad, peerquery);
if (seekable)
gst_query_parse_seeking (peerquery, NULL, &seekable, NULL, NULL);
if (seekable)
gst_query_set_seeking (query, GST_FORMAT_TIME, TRUE, 0, duration);
else
gst_query_set_seeking (query, GST_FORMAT_TIME, FALSE, -1, -1);
gst_query_unref (peerquery);
}
break;
}
case GST_QUERY_SEGMENT:{
GstFormat format;
gint64 start, stop;
format = demux->segment.format;
start =
gst_segment_to_stream_time (&demux->segment, format,
demux->segment.start);
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
else
stop = gst_segment_to_stream_time (&demux->segment, format, stop);
gst_query_set_segment (query, demux->segment.rate, format, start, stop);
ret = TRUE;
break;
}
default:
ret = gst_pad_query_default (pad, parent, query);
break;
}
done:
return ret;
/* ERRORS */
error:
{
GST_DEBUG_OBJECT (pad, "query failed");
goto done;
}
}
static gboolean
gst_mxf_demux_sink_activate (GstPad * sinkpad, GstObject * parent)
{
GstQuery *query;
GstPadMode mode = GST_PAD_MODE_PUSH;
query = gst_query_new_scheduling ();
if (gst_pad_peer_query (sinkpad, query)) {
if (gst_query_has_scheduling_mode_with_flags (query,
GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE)) {
GstSchedulingFlags flags;
gst_query_parse_scheduling (query, &flags, NULL, NULL, NULL);
if (!(flags & GST_SCHEDULING_FLAG_SEQUENTIAL))
mode = GST_PAD_MODE_PULL;
}
}
gst_query_unref (query);
return gst_pad_activate_mode (sinkpad, mode, TRUE);
}
static gboolean
gst_mxf_demux_sink_activate_mode (GstPad * sinkpad, GstObject * parent,
GstPadMode mode, gboolean active)
{
GstMXFDemux *demux;
demux = GST_MXF_DEMUX (parent);
if (mode == GST_PAD_MODE_PUSH) {
demux->random_access = FALSE;
} else {
if (active) {
demux->random_access = TRUE;
return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_mxf_demux_loop,
sinkpad, NULL);
} else {
demux->random_access = FALSE;
return gst_pad_stop_task (sinkpad);
}
}
return TRUE;
}
static gboolean
gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstMXFDemux *demux;
gboolean ret = FALSE;
demux = GST_MXF_DEMUX (parent);
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_pad_event_default (pad, parent, event);
break;
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (demux, "flushing queued data in the MXF demuxer");
gst_adapter_clear (demux->adapter);
demux->flushing = FALSE;
demux->offset = 0;
ret = gst_pad_event_default (pad, parent, event);
break;
case GST_EVENT_EOS:{
GstMXFDemuxPad *p = NULL;
guint i;
if (demux->src->len == 0) {
GST_ELEMENT_ERROR (demux, STREAM, WRONG_TYPE,
("This stream contains no data."),
("got eos and didn't find any streams"));
}
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
if (t->position > 0)
t->duration = t->position;
}
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *p = g_ptr_array_index (demux->src, i);
if (!p->eos
&& p->current_essence_track_position >=
p->current_essence_track->duration) {
p->eos = TRUE;
gst_pad_push_event (GST_PAD_CAST (p), gst_event_new_eos ());
}
}
while ((p = gst_mxf_demux_get_earliest_pad (demux))) {
guint64 offset;
gint64 position;
position = p->current_essence_track_position;
offset =
gst_mxf_demux_find_essence_element (demux, p->current_essence_track,
&position, FALSE);
if (offset == -1) {
GST_ERROR_OBJECT (demux, "Failed to find offset for essence track");
p->eos = TRUE;
gst_pad_push_event (GST_PAD_CAST (p), gst_event_new_eos ());
continue;
}
if (gst_pad_push_event (demux->sinkpad,
gst_event_new_seek (demux->segment.rate, GST_FORMAT_BYTES,
demux->segment.flags | GST_SEEK_FLAG_ACCURATE,
GST_SEEK_TYPE_SET, offset + demux->run_in,
GST_SEEK_TYPE_NONE, 0))) {
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
i);
etrack->position = -1;
}
ret = TRUE;
goto out;
} else {
GST_WARNING_OBJECT (demux,
"Seek to remaining part of the file failed");
p->eos = TRUE;
gst_pad_push_event (GST_PAD_CAST (p), gst_event_new_eos ());
continue;
}
}
/* and one more time for good measure apparently? */
gst_pad_event_default (pad, parent, event);
ret = (demux->src->len > 0);
break;
}
case GST_EVENT_SEGMENT:{
guint i;
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
&g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
i);
t->position = -1;
}
demux->current_partition = NULL;
demux->seqnum = gst_event_get_seqnum (event);
gst_event_unref (event);
ret = TRUE;
break;
}
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
out:
return ret;
}
static gboolean
gst_mxf_demux_query (GstElement * element, GstQuery * query)
{
GstMXFDemux *demux = GST_MXF_DEMUX (element);
gboolean ret = FALSE;
GST_DEBUG_OBJECT (demux, "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)
goto error;
pos = demux->segment.position;
GST_DEBUG_OBJECT (demux,
"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 = -1;
GstFormat format;
guint i;
gst_query_parse_duration (query, &format, NULL);
if (format != GST_FORMAT_TIME)
goto error;
if (demux->src->len == 0)
goto done;
g_rw_lock_reader_lock (&demux->metadata_lock);
for (i = 0; i < demux->src->len; i++) {
GstMXFDemuxPad *pad = g_ptr_array_index (demux->src, i);
gint64 pdur = -1;
if (!pad->material_track || !pad->material_track->parent.sequence)
continue;
pdur = pad->material_track->parent.sequence->duration;
if (pad->material_track->edit_rate.n == 0 ||
pad->material_track->edit_rate.d == 0 || pdur <= -1)
continue;
pdur =
gst_util_uint64_scale (pdur,
GST_SECOND * pad->material_track->edit_rate.d,
pad->material_track->edit_rate.n);
duration = MAX (duration, pdur);
}
g_rw_lock_reader_unlock (&demux->metadata_lock);
if (duration == -1) {
GST_DEBUG_OBJECT (demux, "No duration known (yet)");
goto done;
}
GST_DEBUG_OBJECT (demux,
"Returning duration %" G_GINT64_FORMAT " in format %s", duration,
gst_format_get_name (format));
gst_query_set_duration (query, format, duration);
ret = TRUE;
break;
}
case GST_QUERY_SEEKING:{
GstFormat fmt;
ret = TRUE;
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
if (fmt != GST_FORMAT_TIME) {
gst_query_set_seeking (query, fmt, FALSE, -1, -1);
goto done;
}
if (demux->random_access) {
gst_query_set_seeking (query, GST_FORMAT_TIME, TRUE, 0, -1);
} else {
GstQuery *peerquery = gst_query_new_seeking (GST_FORMAT_BYTES);
gboolean seekable;
seekable = gst_pad_peer_query (demux->sinkpad, peerquery);
if (seekable)
gst_query_parse_seeking (peerquery, NULL, &seekable, NULL, NULL);
if (seekable)
gst_query_set_seeking (query, GST_FORMAT_TIME, TRUE, 0, -1);
else
gst_query_set_seeking (query, GST_FORMAT_TIME, FALSE, -1, -1);
}
break;
}
case GST_QUERY_SEGMENT:{
GstFormat format;
gint64 start, stop;
format = demux->segment.format;
start =
gst_segment_to_stream_time (&demux->segment, format,
demux->segment.start);
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
else
stop = gst_segment_to_stream_time (&demux->segment, format, stop);
gst_query_set_segment (query, demux->segment.rate, format, start, stop);
ret = TRUE;
break;
}
default:
/* else forward upstream */
ret = gst_pad_peer_query (demux->sinkpad, query);
break;
}
done:
return ret;
/* ERRORS */
error:
{
GST_DEBUG_OBJECT (demux, "query failed");
goto done;
}
}
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:
demux->seqnum = gst_util_seqnum_next ();
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;
case PROP_MAX_DRIFT:
demux->max_drift = g_value_get_uint64 (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;
case PROP_MAX_DRIFT:
g_value_set_uint64 (value, demux->max_drift);
break;
case PROP_STRUCTURE:{
GstStructure *s;
g_rw_lock_reader_lock (&demux->metadata_lock);
if (demux->preface &&
MXF_METADATA_BASE (demux->preface)->resolved ==
MXF_METADATA_BASE_RESOLVE_STATE_SUCCESS)
s = mxf_metadata_base_to_structure (MXF_METADATA_BASE (demux->preface));
else
s = NULL;
gst_value_set_structure (value, s);
if (s)
gst_structure_free (s);
g_rw_lock_reader_unlock (&demux->metadata_lock);
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);
gst_mxf_demux_reset (demux);
if (demux->adapter) {
g_object_unref (demux->adapter);
demux->adapter = NULL;
}
if (demux->flowcombiner) {
gst_flow_combiner_free (demux->flowcombiner);
demux->flowcombiner = 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;
g_ptr_array_free (demux->src, TRUE);
demux->src = NULL;
g_array_free (demux->essence_tracks, TRUE);
demux->essence_tracks = NULL;
g_hash_table_destroy (demux->metadata);
g_rw_lock_clear (&demux->metadata_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
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");
parent_class = g_type_class_peek_parent (klass);
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));
g_object_class_install_property (gobject_class, PROP_MAX_DRIFT,
g_param_spec_uint64 ("max-drift", "Maximum drift",
"Maximum number of nanoseconds by which tracks can differ",
100 * GST_MSECOND, G_MAXUINT64, 500 * GST_MSECOND,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_STRUCTURE,
g_param_spec_boxed ("structure", "Structure",
"Structural metadata of the MXF file",
GST_TYPE_STRUCTURE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_mxf_demux_change_state);
gstelement_class->query = GST_DEBUG_FUNCPTR (gst_mxf_demux_query);
gst_element_class_add_static_pad_template (gstelement_class,
&mxf_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&mxf_src_template);
gst_element_class_set_static_metadata (gstelement_class, "MXF Demuxer",
"Codec/Demuxer", "Demux MXF files",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
static void
gst_mxf_demux_init (GstMXFDemux * demux)
{
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_activatemode_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_mxf_demux_sink_activate_mode));
gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
demux->max_drift = 500 * GST_MSECOND;
demux->adapter = gst_adapter_new ();
demux->flowcombiner = gst_flow_combiner_new ();
g_rw_lock_init (&demux->metadata_lock);
demux->src = g_ptr_array_new ();
demux->essence_tracks =
g_array_new (FALSE, FALSE, sizeof (GstMXFDemuxEssenceTrack));
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
gst_mxf_demux_reset (demux);
}
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