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465 lines
16 KiB
C
465 lines
16 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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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstevent.h: Header for 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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#ifndef __GST_EVENT_H__
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#define __GST_EVENT_H__
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#include <gst/gstminiobject.h>
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#include <gst/gstformat.h>
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#include <gst/gstobject.h>
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#include <gst/gstclock.h>
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#include <gst/gststructure.h>
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#include <gst/gsttaglist.h>
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G_BEGIN_DECLS
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/**
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* GstEventTypeFlags:
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* @GST_EVENT_TYPE_UPSTREAM: Set if the event can travel upstream.
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* @GST_EVENT_TYPE_DOWNSTREAM: Set if the event can travel downstream.
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* @GST_EVENT_TYPE_SERIALIZED: Set if the event should be serialized with data
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* flow.
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*
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* #GstEventTypeFlags indicate the aspects of the different #GstEventType
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* values. You can get the type flags of a #GstEventType with the
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* gst_event_type_get_flags() function.
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*/
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typedef enum {
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GST_EVENT_TYPE_UPSTREAM = 1 << 0,
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GST_EVENT_TYPE_DOWNSTREAM = 1 << 1,
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GST_EVENT_TYPE_SERIALIZED = 1 << 2
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} GstEventTypeFlags;
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/**
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* GST_EVENT_TYPE_BOTH:
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*
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* The same thing as #GST_EVENT_TYPE_UPSTREAM | #GST_EVENT_TYPE_DOWNSTREAM.
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*/
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#define GST_EVENT_TYPE_BOTH \
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(GST_EVENT_TYPE_UPSTREAM | GST_EVENT_TYPE_DOWNSTREAM)
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#define GST_EVENT_TYPE_SHIFT 4
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/**
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* GST_EVENT_MAKE_TYPE:
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* @num: the event number to create
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* @flags: the event flags
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*
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* when making custom event types, use this macro with the num and
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* the given flags
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*/
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#define GST_EVENT_MAKE_TYPE(num,flags) \
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(((num) << GST_EVENT_TYPE_SHIFT) | (flags))
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#define FLAG(name) GST_EVENT_TYPE_##name
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/**
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* GstEventType:
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* @GST_EVENT_UNKNOWN: unknown event.
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* @GST_EVENT_FLUSH_START: Start a flush operation
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* @GST_EVENT_FLUSH_STOP: Stop a flush operation
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* @GST_EVENT_EOS: End-Of-Stream. No more data is to be expected to follow
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* without a NEWSEGMENT event.
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* @GST_EVENT_NEWSEGMENT: A new media segment follows in the dataflow.
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* @GST_EVENT_TAG: A new set of metadata tags has been found in the stream.
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* @GST_EVENT_BUFFERSIZE: Notification of buffering requirements
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* @GST_EVENT_QOS: A quality message. Used to indicate to upstream elements
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* that the downstream elements are being starved of or
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* flooded with data.
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* @GST_EVENT_SEEK: A request for a new playback position and rate.
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* @GST_EVENT_NAVIGATION: Navigation events are usually used for communicating
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* user requests, such as mouse or keyboard movements,
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* to upstream elements.
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* @GST_EVENT_LATENCY: Notification of new latency adjustment. Since: 0.10.12
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* @GST_EVENT_CUSTOM_UPSTREAM: Upstream custom event
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* @GST_EVENT_CUSTOM_DOWNSTREAM: Downstream custom event that travels in the
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* data flow.
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* @GST_EVENT_CUSTOM_DOWNSTREAM_OOB: Custom out-of-band downstream event.
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* @GST_EVENT_CUSTOM_BOTH: Custom upstream or downstream event.
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* In-band when travelling downstream.
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* @GST_EVENT_CUSTOM_BOTH_OOB: Custom upstream or downstream out-of-band event.
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*
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* #GstEventType lists the standard event types that can be sent in a pipeline.
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*
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* The custom event types can be used for private messages between elements
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* that can't be expressed using normal
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* GStreamer buffer passing semantics. Custom events carry an arbitrary
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* #GstStructure.
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* Specific custom events are distinguished by the name of the structure.
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*/
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/* NOTE: keep in sync with quark registration in gstevent.c */
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typedef enum {
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GST_EVENT_UNKNOWN = GST_EVENT_MAKE_TYPE (0, 0),
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/* bidirectional events */
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GST_EVENT_FLUSH_START = GST_EVENT_MAKE_TYPE (1, FLAG(BOTH)),
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GST_EVENT_FLUSH_STOP = GST_EVENT_MAKE_TYPE (2, FLAG(BOTH) | FLAG(SERIALIZED)),
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/* downstream serialized events */
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GST_EVENT_EOS = GST_EVENT_MAKE_TYPE (5, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_EVENT_NEWSEGMENT = GST_EVENT_MAKE_TYPE (6, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_EVENT_TAG = GST_EVENT_MAKE_TYPE (7, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_EVENT_BUFFERSIZE = GST_EVENT_MAKE_TYPE (8, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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/* upstream events */
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GST_EVENT_QOS = GST_EVENT_MAKE_TYPE (15, FLAG(UPSTREAM)),
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GST_EVENT_SEEK = GST_EVENT_MAKE_TYPE (16, FLAG(UPSTREAM)),
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GST_EVENT_NAVIGATION = GST_EVENT_MAKE_TYPE (17, FLAG(UPSTREAM)),
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GST_EVENT_LATENCY = GST_EVENT_MAKE_TYPE (18, FLAG(UPSTREAM)),
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/* custom events start here */
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GST_EVENT_CUSTOM_UPSTREAM = GST_EVENT_MAKE_TYPE (32, FLAG(UPSTREAM)),
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GST_EVENT_CUSTOM_DOWNSTREAM = GST_EVENT_MAKE_TYPE (32, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_EVENT_CUSTOM_DOWNSTREAM_OOB = GST_EVENT_MAKE_TYPE (32, FLAG(DOWNSTREAM)),
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GST_EVENT_CUSTOM_BOTH = GST_EVENT_MAKE_TYPE (32, FLAG(BOTH) | FLAG(SERIALIZED)),
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GST_EVENT_CUSTOM_BOTH_OOB = GST_EVENT_MAKE_TYPE (32, FLAG(BOTH))
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} GstEventType;
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#undef FLAG
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/**
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* GST_EVENT_TRACE_NAME:
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*
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* The name used for memory allocation tracing
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*/
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#define GST_EVENT_TRACE_NAME "GstEvent"
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typedef struct _GstEvent GstEvent;
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typedef struct _GstEventClass GstEventClass;
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#define GST_TYPE_EVENT (gst_event_get_type())
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#define GST_IS_EVENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_EVENT))
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#define GST_IS_EVENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_EVENT))
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#define GST_EVENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_EVENT, GstEventClass))
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#define GST_EVENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_EVENT, GstEvent))
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#define GST_EVENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_EVENT, GstEventClass))
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#define GST_EVENT_CAST(obj) ((GstEvent *)(obj))
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/**
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* GST_EVENT_TYPE:
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* @event: the event to query
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*
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* Get the #GstEventType of the event.
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*/
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#define GST_EVENT_TYPE(event) (GST_EVENT_CAST(event)->type)
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/**
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* GST_EVENT_TYPE_NAME:
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* @event: the event to query
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*
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* Get a constant string representation of the #GstEventType of the event.
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*/
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#define GST_EVENT_TYPE_NAME(event) (gst_event_type_get_name(GST_EVENT_TYPE(event)))
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/**
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* GST_EVENT_TIMESTAMP:
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* @event: the event to query
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*
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* Get the #GstClockTime timestamp of the event. This is the time when the event
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* was created.
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*/
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#define GST_EVENT_TIMESTAMP(event) (GST_EVENT_CAST(event)->timestamp)
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/**
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* GST_EVENT_SRC:
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* @event: the event to query
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*
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* The source #GstObject that generated this event.
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*/
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#define GST_EVENT_SRC(event) (GST_EVENT_CAST(event)->src)
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/**
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* GST_EVENT_IS_UPSTREAM:
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* @ev: the event to query
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*
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* Check if an event can travel upstream.
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*/
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#define GST_EVENT_IS_UPSTREAM(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_UPSTREAM)
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/**
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* GST_EVENT_IS_DOWNSTREAM:
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* @ev: the event to query
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*
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* Check if an event can travel downstream.
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*/
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#define GST_EVENT_IS_DOWNSTREAM(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_DOWNSTREAM)
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/**
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* GST_EVENT_IS_SERIALIZED:
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* @ev: the event to query
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*
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* Check if an event is serialized with the data stream.
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*/
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#define GST_EVENT_IS_SERIALIZED(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_SERIALIZED)
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/**
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* gst_event_replace:
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* @old_event: pointer to a pointer to a #GstEvent to be replaced.
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* @new_event: pointer to a #GstEvent that will replace the event pointed to
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* by @old_event.
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*
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* Modifies a pointer to a #GstEvent to point to a different #GstEvent. The
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* modification is done atomically (so this is useful for ensuring thread safety
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* in some cases), and the reference counts are updated appropriately (the old
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* event is unreffed, the new one is reffed).
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*
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* Either @new_event or the #GstEvent pointed to by @old_event may be NULL.
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*
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* Since: 0.10.3
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*/
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#define gst_event_replace(old_event,new_event) \
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gst_mini_object_replace ((GstMiniObject **)(old_event), GST_MINI_OBJECT (new_event))
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/**
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* GstSeekType:
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* @GST_SEEK_TYPE_NONE: no change in position is required
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* @GST_SEEK_TYPE_CUR: change relative to currently configured segment. This
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* can't be used to seek relative to the current playback position - do a
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* position query, calculate the desired position and then do an absolute
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* position seek instead if that's what you want to do.
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* @GST_SEEK_TYPE_SET: absolute position is requested
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* @GST_SEEK_TYPE_END: relative position to duration is requested
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*
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* The different types of seek events. When constructing a seek event with
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* gst_event_new_seek(), a format, a seek method and optional flags are to
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* be provided. The seek event is then inserted into the graph with
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* gst_pad_send_event() or gst_element_send_event().
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*/
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typedef enum {
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/* one of these */
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GST_SEEK_TYPE_NONE = 0,
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GST_SEEK_TYPE_CUR = 1,
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GST_SEEK_TYPE_SET = 2,
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GST_SEEK_TYPE_END = 3
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} GstSeekType;
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/**
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* GstSeekFlags:
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* @GST_SEEK_FLAG_NONE: no flag
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* @GST_SEEK_FLAG_FLUSH: flush pipeline
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* @GST_SEEK_FLAG_ACCURATE: accurate position is requested, this might
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* be considerably slower for some formats.
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* @GST_SEEK_FLAG_KEY_UNIT: seek to the nearest keyframe. This might be
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* faster but less accurate.
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* @GST_SEEK_FLAG_SEGMENT: perform a segment seek.
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* @GST_SEEK_FLAG_SKIP: when doing fast foward or fast reverse playback, allow
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* elements to skip frames instead of generating all
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* frames. Since 0.10.22.
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*
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* Flags to be used with gst_element_seek() or gst_event_new_seek(). All flags
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* can be used together.
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*
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* A non flushing seek might take some time to perform as the currently
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* playing data in the pipeline will not be cleared.
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*
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* An accurate seek might be slower for formats that don't have any indexes
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* or timestamp markers in the stream. Specifying this flag might require a
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* complete scan of the file in those cases.
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*
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* When performing a segment seek: after the playback of the segment completes,
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* no EOS will be emmited by the element that performed the seek, but a
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* #GST_MESSAGE_SEGMENT_DONE message will be posted on the bus by the element.
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* When this message is posted, it is possible to send a new seek event to
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* continue playback. With this seek method it is possible to perform seemless
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* looping or simple linear editing.
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*
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* When doing fast forward (rate > 1.0) or fast reverse (rate < -1.0) trickmode
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* playback, the @GST_SEEK_FLAG_SKIP flag can be used to instruct decoders
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* and demuxers to adjust the playback rate by skipping frames. This can improve
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* performance and decrease CPU usage because not all frames need to be decoded.
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*/
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typedef enum {
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GST_SEEK_FLAG_NONE = 0,
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GST_SEEK_FLAG_FLUSH = (1 << 0),
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GST_SEEK_FLAG_ACCURATE = (1 << 1),
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GST_SEEK_FLAG_KEY_UNIT = (1 << 2),
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GST_SEEK_FLAG_SEGMENT = (1 << 3),
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GST_SEEK_FLAG_SKIP = (1 << 4)
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} GstSeekFlags;
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/**
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* GstEvent:
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* @mini_object: the parent structure
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* @type: the #GstEventType of the event
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* @timestamp: the timestamp of the event
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* @src: the src of the event
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* @structure: the #GstStructure containing the event info.
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*
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* A #GstEvent.
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*/
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struct _GstEvent {
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GstMiniObject mini_object;
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/*< public >*/ /* with COW */
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GstEventType type;
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guint64 timestamp;
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GstObject *src;
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GstStructure *structure;
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/*< private >*/
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union {
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guint32 seqnum;
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gpointer _gst_reserved;
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} abidata;
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};
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struct _GstEventClass {
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GstMiniObjectClass mini_object_class;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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const gchar* gst_event_type_get_name (GstEventType type);
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GQuark gst_event_type_to_quark (GstEventType type);
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GstEventTypeFlags
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gst_event_type_get_flags (GstEventType type);
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GType gst_event_get_type (void);
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/* refcounting */
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/**
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* gst_event_ref:
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* @event: The event to refcount
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*
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* Increase the refcount of this event.
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*
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* Returns: @event (for convenience when doing assignments)
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstEvent * gst_event_ref (GstEvent * event);
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#endif
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static inline GstEvent *
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gst_event_ref (GstEvent * event)
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{
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return (GstEvent *) gst_mini_object_ref (GST_MINI_OBJECT (event));
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}
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/**
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* gst_event_unref:
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* @event: The event to refcount
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*
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* Decrease the refcount of an event, freeing it if the refcount reaches 0.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_event_unref (GstEvent * event);
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#endif
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static inline void
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gst_event_unref (GstEvent * event)
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{
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gst_mini_object_unref (GST_MINI_OBJECT (event));
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}
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/* copy event */
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/**
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* gst_event_copy:
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* @event: The event to copy
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*
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* Copy the event using the event specific copy function.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_event_copy (GstEvent * event);
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#endif
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static inline GstEvent *
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gst_event_copy (const GstEvent * event)
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{
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return GST_EVENT_CAST (gst_mini_object_copy (GST_MINI_OBJECT (event)));
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}
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/* custom event */
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GstEvent* gst_event_new_custom (GstEventType type, GstStructure *structure);
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const GstStructure *
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gst_event_get_structure (GstEvent *event);
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gboolean gst_event_has_name (GstEvent *event, const gchar *name);
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/* identifiers for events and messages */
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guint32 gst_event_get_seqnum (GstEvent *event);
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void gst_event_set_seqnum (GstEvent *event, guint32 seqnum);
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/* flush events */
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GstEvent * gst_event_new_flush_start (void);
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GstEvent * gst_event_new_flush_stop (void);
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/* EOS event */
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GstEvent * gst_event_new_eos (void);
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/* newsegment events */
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GstEvent* gst_event_new_new_segment (gboolean update, gdouble rate,
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GstFormat format,
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gint64 start, gint64 stop,
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gint64 position);
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GstEvent* gst_event_new_new_segment_full (gboolean update, gdouble rate,
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gdouble applied_rate,
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GstFormat format,
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gint64 start, gint64 stop,
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gint64 position);
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void gst_event_parse_new_segment (GstEvent *event,
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gboolean *update,
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gdouble *rate,
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GstFormat *format,
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gint64 *start, gint64 *stop,
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gint64 *position);
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void gst_event_parse_new_segment_full (GstEvent *event,
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gboolean *update,
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gdouble *rate,
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gdouble *applied_rate,
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GstFormat *format,
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gint64 *start, gint64 *stop,
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gint64 *position);
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/* tag event */
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GstEvent* gst_event_new_tag (GstTagList *taglist);
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void gst_event_parse_tag (GstEvent *event, GstTagList **taglist);
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/* buffer */
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GstEvent * gst_event_new_buffer_size (GstFormat format, gint64 minsize, gint64 maxsize,
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gboolean async);
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void gst_event_parse_buffer_size (GstEvent *event, GstFormat *format, gint64 *minsize,
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gint64 *maxsize, gboolean *async);
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/* QOS events */
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GstEvent* gst_event_new_qos (gdouble proportion, GstClockTimeDiff diff,
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GstClockTime timestamp);
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void gst_event_parse_qos (GstEvent *event, gdouble *proportion, GstClockTimeDiff *diff,
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GstClockTime *timestamp);
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/* seek event */
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GstEvent* gst_event_new_seek (gdouble rate, GstFormat format, GstSeekFlags flags,
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GstSeekType start_type, gint64 start,
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GstSeekType stop_type, gint64 stop);
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void gst_event_parse_seek (GstEvent *event, gdouble *rate, GstFormat *format,
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GstSeekFlags *flags,
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GstSeekType *start_type, gint64 *start,
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GstSeekType *stop_type, gint64 *stop);
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/* navigation event */
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GstEvent* gst_event_new_navigation (GstStructure *structure);
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/* latency event */
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GstEvent* gst_event_new_latency (GstClockTime latency);
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void gst_event_parse_latency (GstEvent *event, GstClockTime *latency);
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G_END_DECLS
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#endif /* __GST_EVENT_H__ */
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