/**
* 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);
{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_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_MESSSAGE_STREAM_COLLECTION.
+ *
+ * Returns: (transfer full): a new select-streams event.
+ *
+ * Since: 1.10
+ */
+GstEvent *
+gst_event_new_select_streams (GList * streams)
+{
+ GstEvent *event;
+ GValue val = G_VALUE_INIT;
+ GstStructure *struc;
+ GList *tmpl;
+
+ 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
* @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.
*
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,
*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
* 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): adress 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_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: (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
projects / platform / upstream / gstreamer.git / blobdiff