* 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.
- * <example>
- * <title>performing a seek on a pipeline</title>
- * <programlisting>
+ * |[
* GstEvent *event;
* gboolean result;
* ...
* if (!result)
* g_warning ("seek failed");
* ...
- * </programlisting>
- * </example>
- *
- * 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_BUFFERSIZE, "buffersize", 0},
{GST_EVENT_SINK_MESSAGE, "sink-message", 0},
{GST_EVENT_EOS, "eos", 0},
- {GST_EVENT_CONTEXT, "context", 0},
{GST_EVENT_SEGMENT_DONE, "segment-done", 0},
{GST_EVENT_GAP, "gap", 0},
{GST_EVENT_QOS, "qos", 0},
} 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;
}
* 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.
+ * This function checks if @event is writable and will never return %NULL.
*
* MT safe.
*/
}
/**
+ * 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));
+
+ ((GstEventImpl *) event)->running_time_offset = offset;
+}
+
+/**
* gst_event_new_flush_start:
*
* Allocate a new flush start event. The flush start event can be sent
* pads accept data again.
*
* Elements can process this event synchronized with the dataflow since
- * the preceeding FLUSH_START event stopped the dataflow.
+ * the preceding FLUSH_START event stopped the dataflow.
*
* This event is typically generated to complete a seek and to resume
* dataflow.
* increasing value.
*
* The upstream element can use the @diff and @timestamp values to decide
- * whether to process more buffers. For possitive @diff, all buffers with
+ * whether to process more buffers. For positive @diff, all buffers with
* timestamp <= @timestamp + @diff will certainly arrive late in the sink
* as well. A (negative) @diff value so that @timestamp + @diff would yield a
* result smaller than 0 is not allowed.
*
* 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);
+
*timestamp =
g_value_get_uint64 (gst_structure_id_get_value (structure,
GST_QUARK (TIMESTAMP)));
+ /* Catch underflows */
+ if (*timestamp > -offset)
+ *timestamp += offset;
+ else
+ *timestamp = 0;
+ }
}
/**
* @format: (out): result location for the stream format
* @flags: (out): result location for the #GstSeekFlags
* @start_type: (out): result location for the #GstSeekType of the start position
- * @start: (out): result location for the start postion expressed in @format
+ * @start: (out): result location for the start position expressed in @format
* @stop_type: (out): result location for the #GstSeekType of the stop position
- * @stop: (out): result location for the stop postion expressed in @format
+ * @stop: (out): result location for the stop position expressed in @format
*
* Parses a seek @event and stores the results in the given result locations.
*/
/**
* gst_event_new_reconfigure:
- * Create a new reconfigure event. The purpose of the reconfingure event is
+ * Create a new reconfigure event. The purpose of the reconfigure event is
* to travel upstream and make elements renegotiate their caps or reconfigure
* their buffer pools. This is useful when changing properties on elements
* or changing the topology of the pipeline.
}
/**
+ * gst_event_set_group_id:
+ * @event: a stream-start event
+ * @group_id: the group id to set
+ *
+ * All streams that have the same group id are supposed to be played
+ * together, i.e. all streams inside a container file should have the
+ * same group id but different stream ids. The group id should change
+ * each time the stream is started, resulting in different group ids
+ * each time a file is played for example.
+ *
+ * Use gst_util_group_id_next() to get a new group id.
+ *
+ * Since: 1.2
+ */
+void
+gst_event_set_group_id (GstEvent * event, guint group_id)
+{
+ 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 (GROUP_ID), G_TYPE_UINT, group_id, NULL);
+}
+
+/**
+ * gst_event_parse_group_id:
+ * @event: a stream-start event
+ * @group_id: (out): address of variable where to store the group id
+ *
+ * Returns: %TRUE if a group id was set on the event and could be parsed,
+ * %FALSE otherwise.
+ *
+ * Since: 1.2
+ */
+gboolean
+gst_event_parse_group_id (GstEvent * event, guint * group_id)
+{
+ g_return_val_if_fail (event != NULL, FALSE);
+ g_return_val_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_START,
+ FALSE);
+
+ if (group_id) {
+ return gst_structure_id_get (GST_EVENT_STRUCTURE (event),
+ GST_QUARK (GROUP_ID), G_TYPE_UINT, group_id, NULL);
+ }
+
+ return TRUE;
+}
+
+/**
* gst_event_new_toc:
* @toc: (transfer none): #GstToc structure.
* @updated: whether @toc was updated or not.
/**
* gst_event_parse_segment_done:
* @event: A valid #GstEvent of type GST_EVENT_SEGMENT_DONE.
- * @format: (out): Result location for the format, or NULL
- * @position: (out): 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.
*
if (position != NULL)
*position = g_value_get_int64 (val);
}
-
-/**
- * gst_event_new_context:
- * @context: (transfer full): the #GstContext
- *
- * Create a new context event. The purpose of the context event is
- * to pass a pipeline-local context to downstream elements.
- *
- * Returns: (transfer full): a new #GstEvent
- *
- * Since: 1.2
- */
-GstEvent *
-gst_event_new_context (GstContext * context)
-{
- GstEvent *event;
- GstStructure *structure;
-
- g_return_val_if_fail (context != NULL, NULL);
-
- GST_CAT_INFO (GST_CAT_EVENT, "creating context event");
-
- structure = gst_structure_new_id (GST_QUARK (EVENT_SEEK),
- GST_QUARK (CONTEXT), GST_TYPE_CONTEXT, context, NULL);
- event = gst_event_new_custom (GST_EVENT_CONTEXT, structure);
- gst_context_unref (context);
-
- return event;
-}
-
-/**
- * gst_event_parse_context:
- * @event: The event to query
- * @context: (out) (transfer full): a pointer to store the #GstContext in.
- *
- * Parse the context event. Unref @context after usage.
- *
- * Since: 1.2
- */
-void
-gst_event_parse_context (GstEvent * event, GstContext ** context)
-{
- const GstStructure *structure;
-
- g_return_if_fail (GST_IS_EVENT (event));
- g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_CONTEXT);
-
- structure = GST_EVENT_STRUCTURE (event);
- if (context)
- *context =
- GST_CONTEXT (g_value_dup_boxed (gst_structure_id_get_value
- (structure, GST_QUARK (CONTEXT))));
-}
projects / platform / upstream / gstreamer.git / blobdiff