X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=gst%2Fgstevent.c;h=0189f433b26b623d03f97ccc46282f3f69f8b745;hb=706e10ad0586bf98c829cdfaa079118447b94ef5;hp=4d48b9a730d01ae2c096431c9356e57b95bcd29f;hpb=0ab956d2c2839c1482a12ecc660e86f019f3c83f;p=platform%2Fupstream%2Fgstreamer.git

diff --git a/gst/gstevent.c b/gst/gstevent.c
index 4d48b9a..0189f43 100644
--- a/gst/gstevent.c
+++ b/gst/gstevent.c
@@ -23,6 +23,7 @@
 
 /**
  * SECTION:gstevent
+ * @title: GstEvent
  * @short_description: Structure describing events that are passed up and down
  *                     a pipeline
  * @see_also: #GstPad, #GstElement
@@ -51,14 +52,14 @@
  * construct and use seek events.
  * To do that gst_event_new_seek() is used to create a seek event. It takes
  * the needed parameters to specify seeking time and mode.
- * |[
+ * |[<!-- language="C" -->
  *   GstEvent *event;
  *   gboolean result;
  *   ...
  *   // construct a seek event to play the media from second 2 to 5, flush
  *   // the pipeline to decrease latency.
- *   event = gst_event_new_seek (1.0, 
- *      GST_FORMAT_TIME, 
+ *   event = gst_event_new_seek (1.0,
+ *      GST_FORMAT_TIME,
  *      GST_SEEK_FLAG_FLUSH,
  *      GST_SEEK_TYPE_SET, 2 * GST_SECOND,
  *      GST_SEEK_TYPE_SET, 5 * GST_SECOND);
@@ -104,11 +105,14 @@ static GstEventQuarks event_quarks[] = {
   {GST_EVENT_UNKNOWN, "unknown", 0},
   {GST_EVENT_FLUSH_START, "flush-start", 0},
   {GST_EVENT_FLUSH_STOP, "flush-stop", 0},
+  {GST_EVENT_SELECT_STREAMS, "select-streams", 0},
   {GST_EVENT_STREAM_START, "stream-start", 0},
+  {GST_EVENT_STREAM_COLLECTION, "stream-collection", 0},
   {GST_EVENT_CAPS, "caps", 0},
   {GST_EVENT_SEGMENT, "segment", 0},
   {GST_EVENT_TAG, "tag", 0},
   {GST_EVENT_TOC, "toc", 0},
+  {GST_EVENT_PROTECTION, "protection", 0},
   {GST_EVENT_BUFFERSIZE, "buffersize", 0},
   {GST_EVENT_SINK_MESSAGE, "sink-message", 0},
   {GST_EVENT_EOS, "eos", 0},
@@ -127,6 +131,7 @@ static GstEventQuarks event_quarks[] = {
   {GST_EVENT_CUSTOM_DOWNSTREAM_STICKY, "custom-downstream-sticky", 0},
   {GST_EVENT_CUSTOM_BOTH, "custom-both", 0},
   {GST_EVENT_CUSTOM_BOTH_OOB, "custom-both-oob", 0},
+  {GST_EVENT_STREAM_GROUP_DONE, "stream-group-done", 0},
 
   {0, NULL, 0}
 };
@@ -223,6 +228,9 @@ _gst_event_free (GstEvent * event)
     gst_structure_set_parent_refcount (s, NULL);
     gst_structure_free (s);
   }
+#ifdef USE_POISONING
+  memset (event, 0xff, sizeof (GstEventImpl));
+#endif
 
   g_slice_free1 (sizeof (GstEventImpl), event);
 }
@@ -288,7 +296,7 @@ gst_event_init (GstEventImpl * event, GstEventType type)
  * New custom events can also be created by subclassing the event type if
  * needed.
  *
- * Returns: (transfer full): the new custom event.
+ * Returns: (transfer full) (nullable): the new custom event.
  */
 GstEvent *
 gst_event_new_custom (GstEventType type, GstStructure * structure)
@@ -328,9 +336,9 @@ had_parent:
  *
  * Access the structure of the event.
  *
- * Returns: The structure of the event. The structure is still
- * owned by the event, which means that you should not free it and
- * that the pointer becomes invalid when you free the event.
+ * Returns: (transfer none) (nullable): The structure of the event. The
+ * structure is still owned by the event, which means that you should not free
+ * it and that the pointer becomes invalid when you free the event.
  *
  * MT safe.
  */
@@ -443,6 +451,8 @@ void
 gst_event_set_seqnum (GstEvent * event, guint32 seqnum)
 {
   g_return_if_fail (GST_IS_EVENT (event));
+  g_return_if_fail (seqnum != GST_SEQNUM_INVALID);
+  g_return_if_fail (gst_event_is_writable (event));
 
   GST_EVENT_SEQNUM (event) = seqnum;
 }
@@ -491,6 +501,7 @@ void
 gst_event_set_running_time_offset (GstEvent * event, gint64 offset)
 {
   g_return_if_fail (GST_IS_EVENT (event));
+  g_return_if_fail (gst_event_is_writable (event));
 
   ((GstEventImpl *) event)->running_time_offset = offset;
 }
@@ -575,6 +586,137 @@ gst_event_parse_flush_stop (GstEvent * event, gboolean * reset_time)
 }
 
 /**
+ * gst_event_new_select_streams:
+ * @streams: (element-type utf8) (transfer none): the list of streams to
+ * activate
+ *
+ * Allocate a new select-streams event.
+ *
+ * The select-streams event requests the specified @streams to be activated.
+ *
+ * The list of @streams corresponds to the "Stream ID" of each stream to be
+ * activated. Those ID can be obtained via the #GstStream objects present
+ * in #GST_EVENT_STREAM_START, #GST_EVENT_STREAM_COLLECTION or
+ * #GST_MESSAGE_STREAM_COLLECTION.
+ *
+ * Note: The list of @streams can not be empty.
+ *
+ * Returns: (transfer full): a new select-streams event or %NULL in case of
+ * an error (like an empty streams list).
+ *
+ * Since: 1.10
+ */
+GstEvent *
+gst_event_new_select_streams (GList * streams)
+{
+  GstEvent *event;
+  GValue val = G_VALUE_INIT;
+  GstStructure *struc;
+  GList *tmpl;
+
+  g_return_val_if_fail (streams != NULL, NULL);
+
+  GST_CAT_INFO (GST_CAT_EVENT, "Creating new select-streams event");
+  struc = gst_structure_new_id_empty (GST_QUARK (EVENT_SELECT_STREAMS));
+  g_value_init (&val, GST_TYPE_LIST);
+  /* Fill struc with streams */
+  for (tmpl = streams; tmpl; tmpl = tmpl->next) {
+    GValue strval = G_VALUE_INIT;
+    const gchar *str = (const gchar *) tmpl->data;
+    g_value_init (&strval, G_TYPE_STRING);
+    g_value_set_string (&strval, str);
+    gst_value_list_append_and_take_value (&val, &strval);
+  }
+  gst_structure_id_take_value (struc, GST_QUARK (STREAMS), &val);
+  event = gst_event_new_custom (GST_EVENT_SELECT_STREAMS, struc);
+
+  return event;
+}
+
+/**
+ * gst_event_parse_select_streams:
+ * @event: The event to parse
+ * @streams: (out) (element-type utf8) (transfer full): the streams
+ *
+ * Parse the SELECT_STREAMS event and retrieve the contained streams.
+ *
+ * Since: 1.10
+ */
+void
+gst_event_parse_select_streams (GstEvent * event, GList ** streams)
+{
+  GstStructure *structure;
+  GList *res = NULL;
+
+  g_return_if_fail (GST_IS_EVENT (event));
+  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_SELECT_STREAMS);
+
+  structure = GST_EVENT_STRUCTURE (event);
+  if (G_LIKELY (streams)) {
+    const GValue *vlist =
+        gst_structure_id_get_value (structure, GST_QUARK (STREAMS));
+    guint i, sz = gst_value_list_get_size (vlist);
+    for (i = 0; i < sz; i++) {
+      const GValue *strv = gst_value_list_get_value (vlist, i);
+      res = g_list_append (res, g_value_dup_string (strv));
+    }
+    *streams = res;
+  }
+}
+
+
+/**
+ * gst_event_new_stream_group_done:
+ * @group_id: the group id of the stream group which is ending
+ *
+ * Create a new Stream Group Done event. The stream-group-done event can
+ * only travel downstream synchronized with the buffer flow. Elements
+ * that receive the event on a pad should handle it mostly like EOS,
+ * and emit any data or pending buffers that would depend on more data
+ * arriving and unblock, since there won't be any more data.
+ *
+ * This event is followed by EOS at some point in the future, and is
+ * generally used when switching pads - to unblock downstream so that
+ * new pads can be exposed before sending EOS on the existing pads.
+ *
+ * Returns: (transfer full): the new stream-group-done event.
+ *
+ * Since: 1.10
+ */
+GstEvent *
+gst_event_new_stream_group_done (guint group_id)
+{
+  GstStructure *s;
+
+  s = gst_structure_new_id (GST_QUARK (EVENT_STREAM_GROUP_DONE),
+      GST_QUARK (GROUP_ID), G_TYPE_UINT, group_id, NULL);
+
+  return gst_event_new_custom (GST_EVENT_STREAM_GROUP_DONE, s);
+}
+
+/**
+ * gst_event_parse_stream_group_done:
+ * @event: a stream-group-done event.
+ * @group_id: (out): address of variable to store the group id into
+ *
+ * Parse a stream-group-done @event and store the result in the given
+ * @group_id location.
+ *
+ * Since: 1.10
+ */
+void
+gst_event_parse_stream_group_done (GstEvent * event, guint * group_id)
+{
+  g_return_if_fail (event != NULL);
+  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_GROUP_DONE);
+
+  if (group_id) {
+    gst_structure_id_get (GST_EVENT_STRUCTURE (event),
+        GST_QUARK (GROUP_ID), G_TYPE_UINT, group_id, NULL);
+  }
+}
+
+/**
  * gst_event_new_eos:
  *
  * Create a new EOS event. The eos event can only travel downstream
@@ -665,7 +807,7 @@ gst_event_parse_gap (GstEvent * event, GstClockTime * timestamp,
  * synchronized with the buffer flow and contains the format of the buffers
  * that will follow after the event.
  *
- * Returns: (transfer full): the new CAPS event.
+ * Returns: (transfer full) (nullable): the new CAPS event.
  */
 GstEvent *
 gst_event_new_caps (GstCaps * caps)
@@ -743,7 +885,7 @@ gst_event_parse_caps (GstEvent * event, GstCaps ** caps)
  *
  *   time + (TIMESTAMP(buf) - start) * ABS (rate * applied_rate)
  *
- * Returns: (transfer full): the new SEGMENT event.
+ * Returns: (transfer full) (nullable): the new SEGMENT event.
  */
 GstEvent *
 gst_event_new_segment (const GstSegment * segment)
@@ -959,7 +1101,7 @@ gst_event_parse_buffer_size (GstEvent * event, GstFormat * format,
  * @type indicates the reason for the QoS event. #GST_QOS_TYPE_OVERFLOW is
  * used when a buffer arrived in time or when the sink cannot keep up with
  * the upstream datarate. #GST_QOS_TYPE_UNDERFLOW is when the sink is not
- * receiving buffers fast enough and thus has to drop late buffers. 
+ * receiving buffers fast enough and thus has to drop late buffers.
  * #GST_QOS_TYPE_THROTTLE is used when the datarate is artificially limited
  * by the application, for example to reduce power consumption.
  *
@@ -992,7 +1134,7 @@ gst_event_parse_buffer_size (GstEvent * event, GstFormat * format,
  * The application can use general event probes to intercept the QoS
  * event and implement custom application specific QoS handling.
  *
- * Returns: (transfer full): a new QOS event.
+ * Returns: (transfer full) (nullable): a new QOS event.
  */
 GstEvent *
 gst_event_new_qos (GstQOSType type, gdouble proportion,
@@ -1056,6 +1198,9 @@ gst_event_parse_qos (GstEvent * event, GstQOSType * type,
             GST_QUARK (DIFF)));
   if (timestamp) {
     gint64 offset = gst_event_get_running_time_offset (event);
+    GstClockTimeDiff diff_ =
+        g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (DIFF)));
 
     *timestamp =
         g_value_get_uint64 (gst_structure_id_get_value (structure,
@@ -1065,6 +1210,11 @@ gst_event_parse_qos (GstEvent * event, GstQOSType * type,
       *timestamp += offset;
     else
       *timestamp = 0;
+
+    /* Make sure that timestamp + diff is always >= 0. Because
+     * of the running time offset this might not be true */
+    if (diff_ < 0 && *timestamp < -diff_)
+      *timestamp = (GstClockTime) - diff_;
   }
 }
 
@@ -1091,15 +1241,15 @@ gst_event_parse_qos (GstEvent * event, GstQOSType * type,
  *
  * A pipeline has a default playback segment configured with a start
  * position of 0, a stop position of -1 and a rate of 1.0. The currently
- * configured playback segment can be queried with #GST_QUERY_SEGMENT. 
+ * configured playback segment can be queried with #GST_QUERY_SEGMENT.
  *
- * @start_type and @stop_type specify how to adjust the currently configured 
+ * @start_type and @stop_type specify how to adjust the currently configured
  * start and stop fields in playback segment. Adjustments can be made relative
  * or absolute to the last configured values. A type of #GST_SEEK_TYPE_NONE
  * means that the position should not be updated.
  *
  * When the rate is positive and @start has been updated, playback will start
- * from the newly configured start position. 
+ * from the newly configured start position.
  *
  * For negative rates, playback will start from the newly configured stop
  * position (if any). If the stop position is updated, it must be different from
@@ -1110,7 +1260,7 @@ gst_event_parse_qos (GstEvent * event, GstQOSType * type,
  * #GST_QUERY_POSITION and update the playback segment current position with a
  * #GST_SEEK_TYPE_SET to the desired position.
  *
- * Returns: (transfer full): a new seek event.
+ * Returns: (transfer full) (nullable): a new seek event.
  */
 GstEvent *
 gst_event_new_seek (gdouble rate, GstFormat format, GstSeekFlags flags,
@@ -1121,6 +1271,18 @@ gst_event_new_seek (gdouble rate, GstFormat format, GstSeekFlags flags,
 
   g_return_val_if_fail (rate != 0.0, NULL);
 
+  /* SNAP flags only make sense in combination with the KEYUNIT flag. Warn
+   * and unset the SNAP flags if they're set without the KEYUNIT flag */
+  if (!(flags & GST_SEEK_FLAG_KEY_UNIT) &&
+      (flags & (GST_SEEK_FLAG_SNAP_BEFORE | GST_SEEK_FLAG_SNAP_AFTER |
+              GST_SEEK_FLAG_SNAP_NEAREST))) {
+    g_warning ("SNAP seeks only work in combination with the KEY_UNIT "
+        "flag, ignoring SNAP flags");
+    flags &=
+        ~(GST_SEEK_FLAG_SNAP_BEFORE | GST_SEEK_FLAG_SNAP_AFTER |
+        GST_SEEK_FLAG_SNAP_NEAREST);
+  }
+
   if (format == GST_FORMAT_TIME) {
     GST_CAT_INFO (GST_CAT_EVENT,
         "creating seek rate %lf, format TIME, flags %d, "
@@ -1291,7 +1453,7 @@ gst_event_parse_latency (GstEvent * event, GstClockTime * latency)
  * The @intermediate flag instructs the pipeline that this step operation is
  * part of a larger step operation.
  *
- * Returns: (transfer full): a new #GstEvent
+ * Returns: (transfer full) (nullable): a new #GstEvent
  */
 GstEvent *
 gst_event_new_step (GstFormat format, guint64 amount, gdouble rate,
@@ -1451,7 +1613,10 @@ gst_event_parse_sink_message (GstEvent * event, GstMessage ** msg)
  * stream is split into (potentially) multiple new streams, e.g. in a demuxer,
  * but not for every single element in the pipeline.
  * gst_pad_create_stream_id() or gst_pad_create_stream_id_printf() can be
- * used to create a stream-id.
+ * used to create a stream-id.  There are no particular semantics for the
+ * stream-id, though it should be deterministic (to support stream matching)
+ * and it might be used to order streams (besides any information conveyed by
+ * stream flags).
  *
  * Returns: (transfer full): the new STREAM_START event.
  */
@@ -1496,6 +1661,48 @@ gst_event_parse_stream_start (GstEvent * event, const gchar ** stream_id)
 }
 
 /**
+ * gst_event_set_stream:
+ * @event: a stream-start event
+ * @stream: (transfer none): the stream object to set
+ *
+ * Set the @stream on the stream-start @event
+ *
+ * Since: 1.10
+ */
+void
+gst_event_set_stream (GstEvent * event, GstStream * stream)
+{
+  g_return_if_fail (event != NULL);
+  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_START);
+  g_return_if_fail (gst_event_is_writable (event));
+
+  gst_structure_id_set (GST_EVENT_STRUCTURE (event),
+      GST_QUARK (STREAM), GST_TYPE_STREAM, stream, NULL);
+}
+
+/**
+ * gst_event_parse_stream:
+ * @event: a stream-start event
+ * @stream: (out) (transfer full): address of variable to store the stream
+ *
+ * Parse a stream-start @event and extract the #GstStream from it.
+ *
+ * Since: 1.10
+ */
+void
+gst_event_parse_stream (GstEvent * event, GstStream ** stream)
+{
+  g_return_if_fail (event != NULL);
+  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_START);
+
+  if (stream) {
+    gst_structure_id_get (GST_EVENT_STRUCTURE (event),
+        GST_QUARK (STREAM), GST_TYPE_STREAM, stream, NULL);
+  }
+
+}
+
+/**
  * gst_event_set_stream_flags:
  * @event: a stream-start event
  * @flags: the stream flags to set
@@ -1584,6 +1791,63 @@ gst_event_parse_group_id (GstEvent * event, guint * group_id)
 }
 
 /**
+ * gst_event_new_stream_collection:
+ * @collection: Active collection for this data flow
+ *
+ * Create a new STREAM_COLLECTION event. The stream collection event can only
+ * travel downstream synchronized with the buffer flow.
+ *
+ * Source elements, demuxers and other elements that manage collections
+ * of streams and post #GstStreamCollection messages on the bus also send
+ * this event downstream on each pad involved in the collection, so that
+ * activation of a new collection can be tracked through the downstream
+ * data flow.
+ *
+ * Returns: (transfer full): the new STREAM_COLLECTION event.
+ *
+ * Since: 1.10
+ */
+GstEvent *
+gst_event_new_stream_collection (GstStreamCollection * collection)
+{
+  GstStructure *s;
+
+  g_return_val_if_fail (collection != NULL, NULL);
+  g_return_val_if_fail (GST_IS_STREAM_COLLECTION (collection), NULL);
+
+  s = gst_structure_new_id (GST_QUARK (EVENT_STREAM_COLLECTION),
+      GST_QUARK (COLLECTION), GST_TYPE_STREAM_COLLECTION, collection, NULL);
+
+  return gst_event_new_custom (GST_EVENT_STREAM_COLLECTION, s);
+}
+
+/**
+ * gst_event_parse_stream_collection:
+ * @event: a stream-collection event
+ * @collection: (out): pointer to store the collection
+ *
+ * Retrieve new #GstStreamCollection from STREAM_COLLECTION event @event.
+ *
+ * Since: 1.10
+ */
+void
+gst_event_parse_stream_collection (GstEvent * event,
+    GstStreamCollection ** collection)
+{
+  const GstStructure *structure;
+
+  g_return_if_fail (event != NULL);
+  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_COLLECTION);
+
+  structure = gst_event_get_structure (event);
+
+  if (collection) {
+    gst_structure_id_get (structure,
+        GST_QUARK (COLLECTION), GST_TYPE_STREAM_COLLECTION, collection, NULL);
+  }
+}
+
+/**
  * gst_event_new_toc:
  * @toc: (transfer none): #GstToc structure.
  * @updated: whether @toc was updated or not.
@@ -1691,6 +1955,119 @@ gst_event_parse_toc_select (GstEvent * event, gchar ** uid)
 }
 
 /**
+ * gst_event_new_protection:
+ * @system_id: (transfer none): a string holding a UUID that uniquely
+ * identifies a protection system.
+ * @data: (transfer none): a #GstBuffer holding protection system specific
+ * information. The reference count of the buffer will be incremented by one.
+ * @origin: a string indicating where the protection
+ * information carried in the event was extracted from. The allowed values
+ * of this string will depend upon the protection scheme.
+ *
+ * Creates a new event containing information specific to a particular
+ * protection system (uniquely identified by @system_id), by which that
+ * protection system can acquire key(s) to decrypt a protected stream.
+ *
+ * In order for a decryption element to decrypt media
+ * protected using a specific system, it first needs all the
+ * protection system specific information necessary to acquire the decryption
+ * key(s) for that stream. The functions defined here enable this information
+ * to be passed in events from elements that extract it
+ * (e.g., ISOBMFF demuxers, MPEG DASH demuxers) to protection decrypter
+ * elements that use it.
+ *
+ * Events containing protection system specific information are created using
+ * #gst_event_new_protection, and they can be parsed by downstream elements
+ * using #gst_event_parse_protection.
+ *
+ * In Common Encryption, protection system specific information may be located
+ * within ISOBMFF files, both in movie (moov) boxes and movie fragment (moof)
+ * boxes; it may also be contained in ContentProtection elements within MPEG
+ * DASH MPDs. The events created by #gst_event_new_protection contain data
+ * identifying from which of these locations the encapsulated protection system
+ * specific information originated. This origin information is required as
+ * some protection systems use different encodings depending upon where the
+ * information originates.
+ *
+ * The events returned by gst_event_new_protection() are implemented
+ * in such a way as to ensure that the most recently-pushed protection info
+ * event of a particular @origin and @system_id will
+ * be stuck to the output pad of the sending element.
+ *
+ * Returns: a #GST_EVENT_PROTECTION event, if successful; %NULL
+ * if unsuccessful.
+ *
+ * Since: 1.6
+ */
+GstEvent *
+gst_event_new_protection (const gchar * system_id,
+    GstBuffer * data, const gchar * origin)
+{
+  gchar *event_name;
+  GstEvent *event;
+  GstStructure *s;
+
+  g_return_val_if_fail (system_id != NULL, NULL);
+  g_return_val_if_fail (data != NULL, NULL);
+
+  event_name =
+      g_strconcat ("GstProtectionEvent", origin ? "-" : "",
+      origin ? origin : "", "-", system_id, NULL);
+
+  GST_CAT_INFO (GST_CAT_EVENT, "creating protection event %s", event_name);
+
+  s = gst_structure_new (event_name, "data", GST_TYPE_BUFFER, data,
+      "system_id", G_TYPE_STRING, system_id, NULL);
+  if (origin)
+    gst_structure_set (s, "origin", G_TYPE_STRING, origin, NULL);
+  event = gst_event_new_custom (GST_EVENT_PROTECTION, s);
+
+  g_free (event_name);
+  return event;
+}
+
+/**
+ * gst_event_parse_protection:
+ * @event: a #GST_EVENT_PROTECTION event.
+ * @system_id: (out) (allow-none) (transfer none): pointer to store the UUID
+ * string uniquely identifying a content protection system.
+ * @data: (out) (allow-none) (transfer none): pointer to store a #GstBuffer
+ * holding protection system specific information.
+ * @origin: (out) (allow-none) (transfer none): pointer to store a value that
+ * indicates where the protection information carried by @event was extracted
+ * from.
+ *
+ * Parses an event containing protection system specific information and stores
+ * the results in @system_id, @data and @origin. The data stored in @system_id,
+ * @origin and @data are valid until @event is released.
+ *
+ * Since: 1.6
+ */
+void
+gst_event_parse_protection (GstEvent * event, const gchar ** system_id,
+    GstBuffer ** data, const gchar ** origin)
+{
+  const GstStructure *s;
+
+  g_return_if_fail (event != NULL);
+  g_return_if_fail (GST_IS_EVENT (event));
+  g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_PROTECTION);
+
+  s = gst_event_get_structure (event);
+
+  if (origin)
+    *origin = gst_structure_get_string (s, "origin");
+
+  if (system_id)
+    *system_id = gst_structure_get_string (s, "system_id");
+
+  if (data) {
+    const GValue *value = gst_structure_get_value (s, "data");
+    *data = gst_value_get_buffer (value);
+  }
+}
+
+/**
  * gst_event_new_segment_done:
  * @format: The format of the position being done
  * @position: The position of the segment being done