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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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550 lines
22 KiB
C
550 lines
22 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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typedef struct _GstEvent GstEvent;
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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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* @GST_EVENT_TYPE_STICKY: Set if the event is sticky on the pads.
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* @GST_EVENT_TYPE_STICKY_MULTI: Multiple sticky events can be on a pad, each
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* identified by the event name.
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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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GST_EVENT_TYPE_STICKY = 1 << 3,
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GST_EVENT_TYPE_STICKY_MULTI = 1 << 4
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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_NUM_SHIFT (8)
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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_NUM_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. This event clears all data
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* from the pipeline and unblock all streaming threads.
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* @GST_EVENT_FLUSH_STOP: Stop a flush operation. This event resets the
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* running-time of the pipeline.
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* @GST_EVENT_STREAM_START: Event to mark the start of a new stream. Sent before any
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* other serialized event and only sent at the start of a new stream,
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* not after flushing seeks.
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* @GST_EVENT_CAPS: #GstCaps event. Notify the pad of a new media type.
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* @GST_EVENT_SEGMENT: A new media segment follows in the dataflow. The
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* segment events contains information for clipping buffers and
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* converting buffer timestamps to running-time and
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* stream-time.
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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. Currently not
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* used yet.
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* @GST_EVENT_SINK_MESSAGE: An event that sinks turn into a message. Used to
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* send messages that should be emitted in sync with
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* rendering.
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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 SEGMENT event.
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* @GST_EVENT_SEGMENT_DONE: Marks the end of a segment playback.
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* @GST_EVENT_GAP: Marks a gap in the datastream.
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* @GST_EVENT_TOC: An event which indicates that a new table of contents (TOC)
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* was found or updated.
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* @GST_EVENT_QOS: A quality message. Used to indicate to upstream elements
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* that the downstream elements should adjust their processing
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* rate.
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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. Sinks will use
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* the latency information to adjust their synchronisation.
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* @GST_EVENT_STEP: A request for stepping through the media. Sinks will usually
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* execute the step operation.
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* @GST_EVENT_RECONFIGURE: A request for upstream renegotiating caps and reconfiguring.
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* @GST_EVENT_TOC_SELECT: A request for a new playback position based on TOC
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* entry's UID.
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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_DOWNSTREAM_STICKY: Custom sticky 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 (10, FLAG(BOTH)),
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GST_EVENT_FLUSH_STOP = GST_EVENT_MAKE_TYPE (20, FLAG(BOTH) | FLAG(SERIALIZED)),
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/* downstream serialized events */
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GST_EVENT_STREAM_START = GST_EVENT_MAKE_TYPE (40, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)),
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GST_EVENT_CAPS = GST_EVENT_MAKE_TYPE (50, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)),
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GST_EVENT_SEGMENT = GST_EVENT_MAKE_TYPE (70, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)),
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GST_EVENT_TAG = GST_EVENT_MAKE_TYPE (80, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY) | FLAG(STICKY_MULTI)),
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GST_EVENT_BUFFERSIZE = GST_EVENT_MAKE_TYPE (90, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)),
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GST_EVENT_SINK_MESSAGE = GST_EVENT_MAKE_TYPE (100, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY) | FLAG(STICKY_MULTI)),
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GST_EVENT_EOS = GST_EVENT_MAKE_TYPE (110, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)),
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GST_EVENT_TOC = GST_EVENT_MAKE_TYPE (120, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY) | FLAG(STICKY_MULTI)),
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/* non-sticky downstream serialized */
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GST_EVENT_SEGMENT_DONE = GST_EVENT_MAKE_TYPE (150, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_EVENT_GAP = GST_EVENT_MAKE_TYPE (160, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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/* upstream events */
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GST_EVENT_QOS = GST_EVENT_MAKE_TYPE (190, FLAG(UPSTREAM)),
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GST_EVENT_SEEK = GST_EVENT_MAKE_TYPE (200, FLAG(UPSTREAM)),
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GST_EVENT_NAVIGATION = GST_EVENT_MAKE_TYPE (210, FLAG(UPSTREAM)),
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GST_EVENT_LATENCY = GST_EVENT_MAKE_TYPE (220, FLAG(UPSTREAM)),
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GST_EVENT_STEP = GST_EVENT_MAKE_TYPE (230, FLAG(UPSTREAM)),
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GST_EVENT_RECONFIGURE = GST_EVENT_MAKE_TYPE (240, FLAG(UPSTREAM)),
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GST_EVENT_TOC_SELECT = GST_EVENT_MAKE_TYPE (250, FLAG(UPSTREAM)),
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/* custom events start here */
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GST_EVENT_CUSTOM_UPSTREAM = GST_EVENT_MAKE_TYPE (270, FLAG(UPSTREAM)),
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GST_EVENT_CUSTOM_DOWNSTREAM = GST_EVENT_MAKE_TYPE (280, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_EVENT_CUSTOM_DOWNSTREAM_OOB = GST_EVENT_MAKE_TYPE (290, FLAG(DOWNSTREAM)),
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GST_EVENT_CUSTOM_DOWNSTREAM_STICKY = GST_EVENT_MAKE_TYPE (300, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY) | FLAG(STICKY_MULTI)),
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GST_EVENT_CUSTOM_BOTH = GST_EVENT_MAKE_TYPE (310, FLAG(BOTH) | FLAG(SERIALIZED)),
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GST_EVENT_CUSTOM_BOTH_OOB = GST_EVENT_MAKE_TYPE (320, FLAG(BOTH))
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} GstEventType;
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#undef FLAG
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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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#include <gst/gstsegment.h>
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#include <gst/gstsegment.h>
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#include <gst/gstmessage.h>
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G_BEGIN_DECLS
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GST_EXPORT GType _gst_event_type;
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#define GST_TYPE_EVENT (_gst_event_type)
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#define GST_IS_EVENT(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_EVENT))
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#define GST_EVENT_CAST(obj) ((GstEvent *)(obj))
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#define GST_EVENT(obj) (GST_EVENT_CAST(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_SEQNUM:
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* @event: the event to query
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*
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* The sequence number of @event.
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*/
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#define GST_EVENT_SEQNUM(event) (GST_EVENT_CAST(event)->seqnum)
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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_IS_STICKY:
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* @ev: the event to query
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*
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* Check if an event is sticky on the pads.
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*/
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#define GST_EVENT_IS_STICKY(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_STICKY)
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/**
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* gst_event_is_writable:
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* @ev: a #GstEvent
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*
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* Tests if you can safely write data into a event's structure or validly
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* modify the seqnum and timestamp field.
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*/
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#define gst_event_is_writable(ev) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (ev))
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/**
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* gst_event_make_writable:
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* @ev: (transfer full): a #GstEvent
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*
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* Makes a writable event from the given event. If the source event is
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* already writable, this will simply return the same event. A copy will
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* otherwise be made using gst_event_copy().
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*
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* Returns: (transfer full): a writable event which may or may not be the
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* same as @ev
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*/
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#define gst_event_make_writable(ev) GST_EVENT_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (ev)))
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/**
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* gst_event_replace:
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* @old_event: (inout) (transfer full): pointer to a pointer to a #GstEvent
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* to be replaced.
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* @new_event: (allow-none) (transfer none): pointer to a #GstEvent that will
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* replace the event pointed to 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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* Returns: TRUE if @new_event was different from @old_event
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC gboolean gst_event_replace (GstEvent **old_event, GstEvent *new_event);
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#endif
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static inline gboolean
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gst_event_replace (GstEvent **old_event, GstEvent *new_event)
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{
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return gst_mini_object_replace ((GstMiniObject **) old_event, (GstMiniObject *) new_event);
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}
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/**
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* gst_event_steal:
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* @old_event: (inout) (transfer full): pointer to a pointer to a #GstEvent
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* to be stolen.
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*
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* Atomically replace the #GstEvent pointed to by @old_event with NULL and
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* return the original event.
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*
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* Returns: the #GstEvent that was in @old_event
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstEvent * gst_event_steal (GstEvent **old_event);
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#endif
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static inline GstEvent *
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gst_event_steal (GstEvent **old_event)
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{
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return GST_EVENT_CAST (gst_mini_object_steal ((GstMiniObject **) old_event));
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}
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/**
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* gst_event_take:
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* @old_event: (inout) (transfer full): pointer to a pointer to a #GstEvent
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* to be stolen.
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* @new_event: (allow-none) (transfer full): pointer to a #GstEvent that will
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* replace the event pointed to by @old_event.
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*
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* Modifies a pointer to a #GstEvent to point to a different #GstEvent. This
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* function is similar to gst_event_replace() except that it takes ownership of
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* @new_event.
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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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* Returns: TRUE if @new_event was different from @old_event
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC gboolean gst_event_take (GstEvent **old_event, GstEvent *new_event);
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#endif
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static inline gboolean
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gst_event_take (GstEvent **old_event, GstEvent *new_event)
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{
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return gst_mini_object_take ((GstMiniObject **) old_event, (GstMiniObject *) new_event);
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}
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/**
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* GstQOSType:
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* @GST_QOS_TYPE_OVERFLOW: The QoS event type that is produced when downstream
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* elements are producing data too quickly and the element can't keep up
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* processing the data. Upstream should reduce their processing rate. This
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* type is also used when buffers arrive early or in time.
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* @GST_QOS_TYPE_UNDERFLOW: The QoS event type that is produced when downstream
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* elements are producing data too slowly and need to speed up their processing
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* rate.
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* @GST_QOS_TYPE_THROTTLE: The QoS event type that is produced when the
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* application enabled throttling to limit the datarate.
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*
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* The different types of QoS events that can be given to the
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* gst_event_new_qos() method.
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*/
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typedef enum {
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GST_QOS_TYPE_OVERFLOW = 0,
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GST_QOS_TYPE_UNDERFLOW = 1,
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GST_QOS_TYPE_THROTTLE = 2
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} GstQOSType;
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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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* @seqnum: the sequence number of the event
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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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guint32 seqnum;
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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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/* 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: (transfer full): @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_CAST (event));
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}
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/**
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* gst_event_unref:
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* @event: (transfer full): 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_CAST (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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* Returns: (transfer full): the new event
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstEvent * gst_event_copy (const 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_CONST_CAST (event)));
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}
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GType gst_event_get_type (void);
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/* custom event */
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GstEvent* gst_event_new_custom (GstEventType type, GstStructure *structure) G_GNUC_MALLOC;
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const GstStructure *
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gst_event_get_structure (GstEvent *event);
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GstStructure * gst_event_writable_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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/* Stream start event */
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GstEvent * gst_event_new_stream_start (const gchar *stream_id) G_GNUC_MALLOC;
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void gst_event_parse_stream_start (GstEvent *event, const gchar **stream_id);
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/* flush events */
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GstEvent * gst_event_new_flush_start (void) G_GNUC_MALLOC;
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GstEvent * gst_event_new_flush_stop (gboolean reset_time) G_GNUC_MALLOC;
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void gst_event_parse_flush_stop (GstEvent *event, gboolean *reset_time);
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/* EOS event */
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GstEvent * gst_event_new_eos (void) G_GNUC_MALLOC;
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/* GAP event */
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GstEvent * gst_event_new_gap (GstClockTime timestamp,
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GstClockTime duration) G_GNUC_MALLOC;
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void gst_event_parse_gap (GstEvent * event,
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GstClockTime * timestamp,
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GstClockTime * duration);
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/* Caps events */
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GstEvent * gst_event_new_caps (GstCaps *caps) G_GNUC_MALLOC;
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void gst_event_parse_caps (GstEvent *event, GstCaps **caps);
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/* segment event */
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GstEvent* gst_event_new_segment (const GstSegment *segment) G_GNUC_MALLOC;
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void gst_event_parse_segment (GstEvent *event, const GstSegment **segment);
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void gst_event_copy_segment (GstEvent *event, GstSegment *segment);
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/* tag event */
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GstEvent* gst_event_new_tag (GstTagList *taglist) G_GNUC_MALLOC;
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void gst_event_parse_tag (GstEvent *event, GstTagList **taglist);
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/* TOC event */
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GstEvent* gst_event_new_toc (GstToc *toc, gboolean updated);
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void gst_event_parse_toc (GstEvent *event, GstToc **toc, gboolean *updated);
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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) G_GNUC_MALLOC;
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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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/* sink message */
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GstEvent* gst_event_new_sink_message (const gchar *name, GstMessage *msg) G_GNUC_MALLOC;
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void gst_event_parse_sink_message (GstEvent *event, GstMessage **msg);
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/* QOS events */
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GstEvent* gst_event_new_qos (GstQOSType type, gdouble proportion,
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GstClockTimeDiff diff, GstClockTime timestamp) G_GNUC_MALLOC;
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void gst_event_parse_qos (GstEvent *event, GstQOSType *type,
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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) G_GNUC_MALLOC;
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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) G_GNUC_MALLOC;
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/* latency event */
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GstEvent* gst_event_new_latency (GstClockTime latency) G_GNUC_MALLOC;
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void gst_event_parse_latency (GstEvent *event, GstClockTime *latency);
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/* step event */
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GstEvent* gst_event_new_step (GstFormat format, guint64 amount, gdouble rate,
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gboolean flush, gboolean intermediate) G_GNUC_MALLOC;
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void gst_event_parse_step (GstEvent *event, GstFormat *format, guint64 *amount,
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gdouble *rate, gboolean *flush, gboolean *intermediate);
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/* renegotiate event */
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GstEvent* gst_event_new_reconfigure (void) G_GNUC_MALLOC;
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/* TOC select event */
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GstEvent* gst_event_new_toc_select (const gchar *uid) G_GNUC_MALLOC;
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void gst_event_parse_toc_select (GstEvent *event, gchar **uid);
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/* segment-done event */
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GstEvent* gst_event_new_segment_done (GstFormat format, gint64 position) G_GNUC_MALLOC;
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void gst_event_parse_segment_done (GstEvent *event, GstFormat *format, gint64 *position);
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G_END_DECLS
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#endif /* __GST_EVENT_H__ */
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