/**
* SECTION:gstevent
+ * @title: GstEvent
* @short_description: Structure describing events that are passed up and down
* a pipeline
* @see_also: #GstPad, #GstElement
* 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);
* g_warning ("seek failed");
* ...
* ]|
- *
- * Last reviewed on 2012-03-28 (0.11.3)
*/
GstEvent event;
GstStructure *structure;
+ gint64 running_time_offset;
} GstEventImpl;
#define GST_EVENT_STRUCTURE(e) (((GstEventImpl *)(e))->structure)
{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},
{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}
};
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);
}
} else {
GST_EVENT_STRUCTURE (copy) = NULL;
}
+
+ ((GstEventImpl *) copy)->running_time_offset =
+ ((GstEventImpl *) event)->running_time_offset;
+
return GST_EVENT_CAST (copy);
}
GST_EVENT_TYPE (event) = type;
GST_EVENT_TIMESTAMP (event) = GST_CLOCK_TIME_NONE;
GST_EVENT_SEQNUM (event) = gst_util_seqnum_next ();
+ event->running_time_offset = 0;
}
* 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)
*
* 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.
*/
*
* Get a writable version of the structure.
*
- * 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.
- * This function checks if @event is writable and will never return NULL.
+ * Returns: (transfer none): 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.
+ * This function checks if @event is writable and will never return
+ * %NULL.
*
* MT safe.
*/
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;
}
/**
+ * gst_event_get_running_time_offset:
+ * @event: A #GstEvent.
+ *
+ * Retrieve the accumulated running time offset of the event.
+ *
+ * Events passing through #GstPads that have a running time
+ * offset set via gst_pad_set_offset() will get their offset
+ * adjusted according to the pad's offset.
+ *
+ * If the event contains any information that related to the
+ * running time, this information will need to be updated
+ * before usage with this offset.
+ *
+ * Returns: The event's running time offset
+ *
+ * MT safe.
+ *
+ * Since: 1.4
+ */
+gint64
+gst_event_get_running_time_offset (GstEvent * event)
+{
+ g_return_val_if_fail (GST_IS_EVENT (event), 0);
+
+ return ((GstEventImpl *) event)->running_time_offset;
+}
+
+/**
+ * gst_event_set_running_time_offset:
+ * @event: A #GstEvent.
+ * @offset: A the new running time offset
+ *
+ * Set the running time offset of a event. See
+ * gst_event_get_running_time_offset() for more information.
+ *
+ * MT safe.
+ *
+ * Since: 1.4
+ */
+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;
+}
+
+/**
* gst_event_new_flush_start:
*
* Allocate a new flush start event. The flush start event can be sent
}
/**
+ * 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
* 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)
* downstream synchronized with the buffer flow and contains timing information
* and playback properties for the buffers that will follow.
*
- * The newsegment event marks the range of buffers to be processed. All
+ * The segment event marks the range of buffers to be processed. All
* data not within the segment range is not to be processed. This can be
* used intelligently by plugins to apply more efficient methods of skipping
* unneeded data. The valid range is expressed with the @start and @stop
* stream. (@rate * @applied_rate) should always equal the rate that has been
* requested for playback. For example, if an element has an input segment
* with intended playback @rate of 2.0 and applied_rate of 1.0, it can adjust
- * incoming timestamps and buffer content by half and output a newsegment event
+ * incoming timestamps and buffer content by half and output a segment event
* with @rate of 1.0 and @applied_rate of 2.0
*
- * After a newsegment event, the buffer stream time is calculated with:
+ * After a segment event, the buffer stream time is calculated with:
*
* 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)
* @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.
*
* 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,
*
* Get the type, proportion, diff and timestamp in the qos event. See
* gst_event_new_qos() for more information about the different QoS values.
+ *
+ * @timestamp will be adjusted for any pad offsets of pads it was passing through.
*/
void
gst_event_parse_qos (GstEvent * event, GstQOSType * type,
*diff =
g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (DIFF)));
- if (timestamp)
+ 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,
GST_QUARK (TIMESTAMP)));
+ /* Catch underflows */
+ if (*timestamp > -offset)
+ *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_;
+ }
}
/**
*
* 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
* #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,
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, "
GST_QUARK (CUR_TYPE), GST_TYPE_SEEK_TYPE, start_type,
GST_QUARK (CUR), G_TYPE_INT64, start,
GST_QUARK (STOP_TYPE), GST_TYPE_SEEK_TYPE, stop_type,
- GST_QUARK (STOP), G_TYPE_INT64, stop, NULL);
+ GST_QUARK (STOP), G_TYPE_INT64, stop,
+ GST_QUARK (TRICKMODE_INTERVAL), GST_TYPE_CLOCK_TIME, (GstClockTime) 0,
+ NULL);
event = gst_event_new_custom (GST_EVENT_SEEK, structure);
return event;
}
/**
+ * gst_event_set_seek_trickmode_interval:
+ *
+ * Sets a trickmode interval on a (writable) seek event. Elements
+ * that support TRICKMODE_KEY_UNITS seeks SHOULD use this as the minimal
+ * interval between each frame they may output.
+ *
+ * Since: 1.16
+ */
+void
+gst_event_set_seek_trickmode_interval (GstEvent * event, GstClockTime interval)
+{
+ g_return_if_fail (event != NULL);
+ g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_SEEK);
+ g_return_if_fail (gst_event_is_writable (event));
+ g_return_if_fail (GST_CLOCK_TIME_IS_VALID (interval));
+
+ gst_structure_id_set (GST_EVENT_STRUCTURE (event),
+ GST_QUARK (TRICKMODE_INTERVAL), GST_TYPE_CLOCK_TIME, interval, NULL);
+}
+
+/**
+ * gst_event_parse_seek_trickmode_interval:
+ * @interval: (out)
+ *
+ * Retrieve the trickmode interval that may have been set on a
+ * seek event with gst_event_set_seek_trickmode_interval().
+ *
+ * Since: 1.16
+ */
+void
+gst_event_parse_seek_trickmode_interval (GstEvent * event,
+ GstClockTime * interval)
+{
+ g_return_if_fail (event != NULL);
+ g_return_if_fail (interval != NULL);
+ g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_SEEK);
+
+ gst_structure_id_get (GST_EVENT_STRUCTURE (event),
+ GST_QUARK (TRICKMODE_INTERVAL), GST_TYPE_CLOCK_TIME, interval, NULL);
+}
+
+/**
* gst_event_new_navigation:
* @structure: (transfer full): description of the event. The event will take
* ownership of the structure.
* 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,
*
* Returns: (transfer full): a new #GstEvent
*/
-/* FIXME 0.11: take ownership of msg for consistency? */
+/* FIXME 2.0: take ownership of msg for consistency? */
GstEvent *
gst_event_new_sink_message (const gchar * name, GstMessage * msg)
{
*
* Source elements, demuxers and other elements that create new streams
* are supposed to send this event as the first event of a new stream. It
- * should not be send after a flushing seek or in similar situations
+ * should not be sent after a flushing seek or in similar situations
* and is used to mark the beginning of a new logical stream. Elements
* combining multiple streams must ensure that this event is only forwarded
* downstream once and not for every single input stream.
* 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.
*/
}
/**
+ * 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
}
/**
+ * 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.
/**
* gst_event_parse_toc_select:
* @event: a TOC select event.
- * @uid: (out): storage for the selection UID.
+ * @uid: (out) (transfer full) (allow-none): storage for the selection UID.
*
* Parse a TOC select @event and store the results in the given @uid location.
*/
}
/**
+ * 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
/**
* gst_event_parse_segment_done:
* @event: A valid #GstEvent of type GST_EVENT_SEGMENT_DONE.
- * @format: (out) (allow-none): Result location for the format, or NULL
- * @position: (out) (allow-none): Result location for the position, or NULL
+ * @format: (out) (allow-none): Result location for the format, or %NULL
+ * @position: (out) (allow-none): Result location for the position, or %NULL
*
* Extracts the position and format from the segment done message.
*
projects / platform / upstream / gstreamer.git / blobdiff