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8099c34220
Original commit message from CVS: * gst/base/gstbasesink.c: (gst_base_sink_handle_object), (gst_base_sink_event), (gst_base_sink_do_sync), (gst_base_sink_handle_event): * gst/base/gstbasesink.h: Handle newsegments more correctly. * gst/gstbus.c: Fix docs. * gst/gstevent.c: (gst_event_new_newsegment): A newsegment cannot have a start_time of -1
599 lines
18 KiB
C
599 lines
18 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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*
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* gstevent.c: GstEvent subsystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstevent
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* @short_description: Structure describing events that are passed up and down a pipeline
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* @see_also: #GstPad, #GstElement
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*
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* The event classes are used to construct and query events.
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*
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* Events are usually created with gst_event_new() which takes the event type as
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* an argument. Properties specific to the event can be set afterwards with the
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* provided macros. The event should be unreferenced with gst_event_unref().
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*
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* gst_event_new_seek() is a usually used to create a seek event and it takes
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* the needed parameters for a seek event.
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*
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* gst_event_new_flush() creates a new flush event.
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*/
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#include <string.h> /* memcpy */
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#include "gst_private.h"
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#include "gstinfo.h"
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#include "gstevent.h"
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#include "gstenumtypes.h"
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#include "gstutils.h"
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static void gst_event_init (GTypeInstance * instance, gpointer g_class);
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static void gst_event_class_init (gpointer g_class, gpointer class_data);
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static void gst_event_finalize (GstEvent * event);
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static GstEvent *_gst_event_copy (GstEvent * event);
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void
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_gst_event_initialize (void)
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{
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gst_event_get_type ();
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}
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GType
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gst_event_get_type (void)
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{
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static GType _gst_event_type;
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if (G_UNLIKELY (_gst_event_type == 0)) {
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static const GTypeInfo event_info = {
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sizeof (GstEventClass),
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NULL,
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NULL,
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gst_event_class_init,
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NULL,
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NULL,
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sizeof (GstEvent),
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0,
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gst_event_init,
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NULL
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};
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_gst_event_type = g_type_register_static (GST_TYPE_MINI_OBJECT,
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"GstEvent", &event_info, 0);
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}
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return _gst_event_type;
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}
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static void
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gst_event_class_init (gpointer g_class, gpointer class_data)
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{
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GstEventClass *event_class = GST_EVENT_CLASS (g_class);
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event_class->mini_object_class.copy =
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(GstMiniObjectCopyFunction) _gst_event_copy;
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event_class->mini_object_class.finalize =
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(GstMiniObjectFinalizeFunction) gst_event_finalize;
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}
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static void
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gst_event_init (GTypeInstance * instance, gpointer g_class)
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{
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GstEvent *event;
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event = GST_EVENT (instance);
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GST_EVENT_TIMESTAMP (event) = GST_CLOCK_TIME_NONE;
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}
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static void
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gst_event_finalize (GstEvent * event)
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{
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g_return_if_fail (event != NULL);
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g_return_if_fail (GST_IS_EVENT (event));
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GST_CAT_INFO (GST_CAT_EVENT, "freeing event %p", event);
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if (GST_EVENT_SRC (event)) {
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gst_object_unref (GST_EVENT_SRC (event));
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GST_EVENT_SRC (event) = NULL;
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}
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if (event->structure) {
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gst_structure_set_parent_refcount (event->structure, NULL);
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gst_structure_free (event->structure);
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}
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}
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static GstEvent *
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_gst_event_copy (GstEvent * event)
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{
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GstEvent *copy;
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copy = (GstEvent *) gst_mini_object_new (GST_TYPE_EVENT);
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GST_EVENT_TYPE (copy) = GST_EVENT_TYPE (event);
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GST_EVENT_TIMESTAMP (copy) = GST_EVENT_TIMESTAMP (event);
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if (GST_EVENT_SRC (event)) {
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GST_EVENT_SRC (copy) = gst_object_ref (GST_EVENT_SRC (event));
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}
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if (event->structure) {
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copy->structure = gst_structure_copy (event->structure);
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gst_structure_set_parent_refcount (copy->structure,
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&event->mini_object.refcount);
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}
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return copy;
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}
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static GstEvent *
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gst_event_new (GstEventType type)
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{
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GstEvent *event;
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event = (GstEvent *) gst_mini_object_new (GST_TYPE_EVENT);
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GST_CAT_INFO (GST_CAT_EVENT, "creating new event %p %d", event, type);
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event->type = type;
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event->src = NULL;
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event->structure = NULL;
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return event;
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}
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/**
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* gst_event_new_custom:
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* @type: The type of the new event
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* @structure: The structure for the event. The event will take ownership of
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* the structure.
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*
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* Create a new custom-typed event. This can be used for anything not
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* handled by other event-specific functions to pass an event to another
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* element.
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*
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* Make sure to allocate an event type with the #GST_EVENT_MAKE_TYPE macro,
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* assigning a free number and filling in the correct direction and
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* serialization flags.
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*
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* New custom events can also be created by subclassing the event type if
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* needed.
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*
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* Returns: The new custom event.
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*/
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GstEvent *
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gst_event_new_custom (GstEventType type, GstStructure * structure)
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{
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GstEvent *event;
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event = gst_event_new (type);
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if (structure) {
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gst_structure_set_parent_refcount (structure, &event->mini_object.refcount);
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event->structure = structure;
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}
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return event;
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}
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/**
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* gst_event_get_structure:
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* @event: The #GstEvent.
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*
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* Access the structure of the event.
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*
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* Returns: The structure of the event. The structure is still
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* owned by the event, which means that you should not free it and
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* that the pointer becomes invalid when you free the event.
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*
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* MT safe.
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*/
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const GstStructure *
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gst_event_get_structure (GstEvent * event)
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{
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g_return_val_if_fail (GST_IS_EVENT (event), NULL);
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return event->structure;
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}
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/**
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* gst_event_new_flush_start:
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*
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* Allocate a new flush start event. The flush start event can be send
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* upstream and downstream and travels out-of-bounds with the dataflow.
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* It marks pads as being in a WRONG_STATE to process more data.
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*
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* Elements unlock and blocking functions and exit their streaming functions
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* as fast as possible.
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*
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* This event is typically generated after a seek to minimize the latency
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* after the seek.
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*
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* Returns: A new flush start event.
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*/
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GstEvent *
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gst_event_new_flush_start (void)
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{
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return gst_event_new (GST_EVENT_FLUSH_START);
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}
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/**
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* gst_event_new_flush_stop:
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*
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* Allocate a new flush stop event. The flush start event can be send
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* upstream and downstream and travels out-of-bounds with the dataflow.
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* It is typically send after sending a FLUSH_START event to make the
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* pads accept data again.
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*
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* Elements can process this event synchronized with the dataflow since
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* the preceeding FLUSH_START event stopped the dataflow.
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*
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* This event is typically generated to complete a seek and to resume
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* dataflow.
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*
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* Returns: A new flush stop event.
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*/
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GstEvent *
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gst_event_new_flush_stop (void)
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{
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return gst_event_new (GST_EVENT_FLUSH_STOP);
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}
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/**
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* gst_event_new_eos:
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*
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* Create a new EOS event. The eos event can only travel downstream
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* synchronized with the buffer flow. Elements that receive the EOS
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* event on a pad can return UNEXPECTED as a GstFlowReturn when data
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* after the EOS event arrives.
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*
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* The EOS event will travel up to the sink elements in the pipeline
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* which will then post the GST_MESSAGE_EOS on the bus.
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*
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* When all sinks have posted an EOS message, the EOS message is
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* forwarded to the application.
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*
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* Returns: The new EOS event.
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*/
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GstEvent *
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gst_event_new_eos (void)
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{
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return gst_event_new (GST_EVENT_EOS);
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}
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/**
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* gst_event_new_newsegment:
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* @rate: a new rate for playback
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* @format: The format of the segment values
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* @start_value: the start value of the segment
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* @stop_value: the stop value of the segment
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* @base: base value for buffer timestamps.
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*
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* Allocate a new newsegment event with the given format/values tripplets.
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*
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* The newsegment event marks the range of buffers to be processed. All
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* data not within the segment range is not to be processed. This can be
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* used intelligently by plugins to use more efficient methods of skipping
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* unneeded packets.
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*
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* The base time of the segment is also used to convert the buffer timestamps
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* into the stream time again.
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*
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* The @start_value cannot be -1, the @stop_value can be -1. If there
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* is a valid @stop_value given, it must be smaller than @start_value.
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*
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* After a newsegment event, the buffer stream time is calculated with:
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*
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* TIMESTAMP(buf) - start_time + base
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*
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* Returns: A new newsegment event.
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*/
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GstEvent *
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gst_event_new_newsegment (gdouble rate, GstFormat format,
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gint64 start_value, gint64 stop_value, gint64 base)
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{
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if (format == GST_FORMAT_TIME) {
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GST_CAT_INFO (GST_CAT_EVENT,
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"creating newsegment rate %lf, format GST_FORMAT_TIME, "
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"start %" GST_TIME_FORMAT ", stop %" GST_TIME_FORMAT
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", base %" GST_TIME_FORMAT,
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rate, GST_TIME_ARGS (start_value),
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GST_TIME_ARGS (stop_value), GST_TIME_ARGS (base));
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} else {
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GST_CAT_INFO (GST_CAT_EVENT,
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"creating newsegment rate %lf, format %d, "
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"start %lld, stop %lld, base %lld",
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rate, format, start_value, stop_value, base);
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}
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if (start_value == -1)
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g_return_val_if_fail (start_value != -1, NULL);
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if (stop_value != -1)
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g_return_val_if_fail (start_value < stop_value, NULL);
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return gst_event_new_custom (GST_EVENT_NEWSEGMENT,
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gst_structure_new ("GstEventNewsegment", "rate", G_TYPE_DOUBLE, rate,
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"format", GST_TYPE_FORMAT, format,
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"start_val", G_TYPE_INT64, start_value,
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"stop_val", G_TYPE_INT64, stop_value,
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"base", G_TYPE_INT64, base, NULL));
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}
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/**
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* gst_event_parse_newsegment:
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* @event: The event to query
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* @rate: A pointer to the rate of the segment
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* @format: A pointer to the format of the newsegment values
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* @start_value: A pointer to store the start value in
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* @stop_value: A pointer to store the stop value in
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* @base: A pointer to store the base time in
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*
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* Get the start, stop and format in the newsegment event.
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*/
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void
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gst_event_parse_newsegment (GstEvent * event, gdouble * rate,
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GstFormat * format, gint64 * start_value, gint64 * stop_value,
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gint64 * base)
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{
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const GstStructure *structure;
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g_return_if_fail (GST_IS_EVENT (event));
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g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_NEWSEGMENT);
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structure = gst_event_get_structure (event);
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if (rate)
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*rate = g_value_get_double (gst_structure_get_value (structure, "rate"));
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if (format)
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*format = g_value_get_enum (gst_structure_get_value (structure, "format"));
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if (start_value)
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*start_value =
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g_value_get_int64 (gst_structure_get_value (structure, "start_val"));
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if (stop_value)
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*stop_value =
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g_value_get_int64 (gst_structure_get_value (structure, "stop_val"));
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if (base)
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*base = g_value_get_int64 (gst_structure_get_value (structure, "base"));
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}
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/**
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* gst_event_new_tag:
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* @taglist: metadata list
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*
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* Generates a metadata tag event from the given @taglist.
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*
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* Returns: a new #GstEvent
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*/
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GstEvent *
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gst_event_new_tag (GstTagList * taglist)
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{
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g_return_val_if_fail (taglist != NULL, NULL);
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return gst_event_new_custom (GST_EVENT_TAG, (GstStructure *) taglist);
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}
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/**
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* gst_event_parse_tag:
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* @event: a tag event
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* @taglist: pointer to metadata list
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*
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* Parses a tag @event and stores the results in the given @taglist location.
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*/
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void
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gst_event_parse_tag (GstEvent * event, GstTagList ** taglist)
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{
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g_return_if_fail (GST_IS_EVENT (event));
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g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_TAG);
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if (taglist)
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*taglist = (GstTagList *) event->structure;
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}
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/* filler event */
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/**
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* gst_event_new_filler:
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*
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* Create a new dummy event that should be ignored.
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*
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* Returns: a new #GstEvent
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*/
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GstEvent *
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gst_event_new_filler (void)
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{
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return gst_event_new (GST_EVENT_FILLER);
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}
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/**
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* gst_event_new_qos:
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* @proportion: the proportion of the qos message
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* @diff: The time difference of the last Clock sync
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* @timestamp: The timestamp of the buffer
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*
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* Allocate a new qos event with the given values.
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* The QOS event is generated in an element that wants an upstream
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* element to either reduce or increase its rate because of
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* high/low CPU load.
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*
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* proportion is the requested adjustment in datarate, 1.0 is the normal
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* datarate, 0.75 means increase datarate by 75%, 1.5 is 150%. Negative
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* values request a slow down, so -0.75 means a decrease by 75%.
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*
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* diff is the difference against the clock in stream time of the last
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* buffer that caused the element to generate the QOS event.
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*
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* timestamp is the timestamp of the last buffer that cause the element
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* to generate the QOS event.
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*
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* Returns: A new QOS event.
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*/
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GstEvent *
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gst_event_new_qos (gdouble proportion, GstClockTimeDiff diff,
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GstClockTime timestamp)
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{
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GST_CAT_INFO (GST_CAT_EVENT,
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"creating qos proportion %lf, diff %" GST_TIME_FORMAT
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", timestamp %" GST_TIME_FORMAT, proportion,
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GST_TIME_ARGS (diff), GST_TIME_ARGS (timestamp));
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return gst_event_new_custom (GST_EVENT_QOS,
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gst_structure_new ("GstEventQOS",
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"proportion", G_TYPE_DOUBLE, proportion,
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"diff", G_TYPE_INT64, diff,
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"timestamp", G_TYPE_UINT64, timestamp, NULL));
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}
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/**
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* gst_event_parse_qos:
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* @event: The event to query
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* @proportion: A pointer to store the proportion in
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* @diff: A pointer to store the diff in
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* @timestamp: A pointer to store the timestamp in
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*
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* Get the proportion, diff and timestamp in the qos event.
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*/
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void
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gst_event_parse_qos (GstEvent * event, gdouble * proportion,
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GstClockTimeDiff * diff, GstClockTime * timestamp)
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{
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const GstStructure *structure;
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g_return_if_fail (GST_IS_EVENT (event));
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g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_QOS);
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structure = gst_event_get_structure (event);
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if (proportion)
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*proportion =
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g_value_get_double (gst_structure_get_value (structure, "proportion"));
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if (diff)
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*diff = g_value_get_int64 (gst_structure_get_value (structure, "diff"));
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if (timestamp)
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*timestamp =
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g_value_get_uint64 (gst_structure_get_value (structure, "timestamp"));
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}
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/**
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* gst_event_new_seek:
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* @rate: The new playback rate
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* @format: The format of the seek values
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* @flags: The optional seek flags.
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* @cur_type: The type and flags for the new current position
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* @cur: The value of the new current position
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* @stop_type: The type and flags for the new stop position
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* @stop: The value of the new stop position
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*
|
|
* Allocate a new seek event with the given parameters.
|
|
*
|
|
* The seek event configures playback of the pipeline from
|
|
* @cur to @stop at the speed given in @rate.
|
|
* The @cur and @stop values are expressed in format @format.
|
|
*
|
|
* A @rate of 1.0 means normal playback rate, 2.0 means double speed.
|
|
* Negatives values means backwards playback. A value of 0.0 for the
|
|
* rate is not allowed.
|
|
*
|
|
* @cur_type and @stop_type specify how to adjust the current and stop
|
|
* time, relative or absolute. A type of #GST_EVENT_TYPE_NONE means that
|
|
* the position should not be updated.
|
|
*
|
|
* Returns: A new seek event.
|
|
*/
|
|
GstEvent *
|
|
gst_event_new_seek (gdouble rate, GstFormat format, GstSeekFlags flags,
|
|
GstSeekType cur_type, gint64 cur, GstSeekType stop_type, gint64 stop)
|
|
{
|
|
if (format == GST_FORMAT_TIME) {
|
|
GST_CAT_INFO (GST_CAT_EVENT,
|
|
"creating seek rate %lf, format TIME, flags %d, "
|
|
"cur_type %d, cur %" GST_TIME_FORMAT ", "
|
|
"stop_type %d, stop %" GST_TIME_FORMAT,
|
|
rate, flags, cur_type, GST_TIME_ARGS (cur),
|
|
stop_type, GST_TIME_ARGS (stop));
|
|
} else {
|
|
GST_CAT_INFO (GST_CAT_EVENT,
|
|
"creating seek rate %lf, format %d, flags %d, "
|
|
"cur_type %d, cur %" G_GINT64_FORMAT ", "
|
|
"stop_type %d, stop %" G_GINT64_FORMAT,
|
|
rate, format, flags, cur_type, cur, stop_type, stop);
|
|
}
|
|
|
|
return gst_event_new_custom (GST_EVENT_SEEK,
|
|
gst_structure_new ("GstEventSeek", "rate", G_TYPE_DOUBLE, rate,
|
|
"format", GST_TYPE_FORMAT, format,
|
|
"flags", GST_TYPE_SEEK_FLAGS, flags,
|
|
"cur_type", GST_TYPE_SEEK_TYPE, cur_type,
|
|
"cur", G_TYPE_INT64, cur,
|
|
"stop_type", GST_TYPE_SEEK_TYPE, stop_type,
|
|
"stop", G_TYPE_INT64, stop, NULL));
|
|
}
|
|
|
|
/**
|
|
* gst_event_parse_seek:
|
|
* @event: a seek event
|
|
* @rate: result location for the rate
|
|
* @format: result location for the stream format
|
|
* @flags: result location for the #GstSeekFlags
|
|
* @cur_type: result location for the #GstSeekType of the current position
|
|
* @cur: result location for the current postion expressed in @format
|
|
* @stop_type: result location for the #GstSeekType of the stop position
|
|
* @stop: result location for the stop postion expressed in @format
|
|
*
|
|
* Parses a seek @event and stores the results in the given result locations.
|
|
*/
|
|
void
|
|
gst_event_parse_seek (GstEvent * event, gdouble * rate, GstFormat * format,
|
|
GstSeekFlags * flags,
|
|
GstSeekType * cur_type, gint64 * cur,
|
|
GstSeekType * stop_type, gint64 * stop)
|
|
{
|
|
const GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_IS_EVENT (event));
|
|
g_return_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_SEEK);
|
|
|
|
structure = gst_event_get_structure (event);
|
|
if (rate)
|
|
*rate = g_value_get_double (gst_structure_get_value (structure, "rate"));
|
|
if (format)
|
|
*format = g_value_get_enum (gst_structure_get_value (structure, "format"));
|
|
if (flags)
|
|
*flags = g_value_get_flags (gst_structure_get_value (structure, "flags"));
|
|
if (cur_type)
|
|
*cur_type =
|
|
g_value_get_enum (gst_structure_get_value (structure, "cur_type"));
|
|
if (cur)
|
|
*cur = g_value_get_int64 (gst_structure_get_value (structure, "cur"));
|
|
if (stop_type)
|
|
*stop_type =
|
|
g_value_get_enum (gst_structure_get_value (structure, "stop_type"));
|
|
if (stop)
|
|
*stop = g_value_get_int64 (gst_structure_get_value (structure, "stop"));
|
|
}
|
|
|
|
/**
|
|
* gst_event_new_navigation:
|
|
* @structure: description of the event
|
|
*
|
|
* Create a new navigation event from the given description.
|
|
*
|
|
* Returns: a new #GstEvent
|
|
*/
|
|
GstEvent *
|
|
gst_event_new_navigation (GstStructure * structure)
|
|
{
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
|
|
return gst_event_new_custom (GST_EVENT_NAVIGATION, structure);
|
|
}
|