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cfd14e0fd3
Original commit message from CVS: 2005-10-10 Andy Wingo <wingo@pobox.com> * gst/gstelement.c (gst_element_init, gst_element_finalize): Allocate and free the mutex properly. * gst/gstelement.h (GST_STATE_UNLOCK_FULL, GST_STATE_LOCK_FULL): New macros. (GstElement): The state_lock is now recursive. Rebuild your plugins, suckers. Old macros adapted.
502 lines
18 KiB
C
502 lines
18 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2004 Wim Taymans <wim@fluendo.com>
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*
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* gstelement.h: Header for GstElement
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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_ELEMENT_H__
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#define __GST_ELEMENT_H__
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/* gstelement.h and gstelementfactory.h include eachother */
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typedef struct _GstElement GstElement;
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typedef struct _GstElementClass GstElementClass;
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/* gstmessage.h needs State */
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typedef enum {
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GST_STATE_VOID_PENDING = 0, /* used for GstElement->pending_state when
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there is no pending state */
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GST_STATE_NULL = 1,
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GST_STATE_READY = 2,
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GST_STATE_PAUSED = 3,
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GST_STATE_PLAYING = 4
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} GstState;
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#include <gst/gstconfig.h>
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#include <gst/gstobject.h>
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#include <gst/gstpad.h>
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#include <gst/gstbus.h>
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#include <gst/gstclock.h>
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#include <gst/gstelementfactory.h>
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#include <gst/gstplugin.h>
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#include <gst/gstpluginfeature.h>
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#include <gst/gstindex.h>
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#include <gst/gstindexfactory.h>
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#include <gst/gstiterator.h>
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#include <gst/gstmessage.h>
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#include <gst/gsttaglist.h>
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G_BEGIN_DECLS
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GST_EXPORT GType _gst_element_type;
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#define GST_TYPE_ELEMENT (_gst_element_type)
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#define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
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#define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
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#define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
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#define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
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#define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
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#define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
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/**
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* GstStateChangeReturn:
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* @GST_STATE_CHANGE_FAILURE : the state change failed
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* @GST_STATE_CHANGE_SUCCESS : the state change succeeded
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* @GST_STATE_CHANGE_ASYNC : the state change will happen asynchronously
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* @GST_STATE_CHANGE_NO_PREROLL: the state change cannot be prerolled
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*
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* the possible return values from a state change function.
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*/
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typedef enum {
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GST_STATE_CHANGE_FAILURE = 0,
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GST_STATE_CHANGE_SUCCESS = 1,
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GST_STATE_CHANGE_ASYNC = 2,
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GST_STATE_CHANGE_NO_PREROLL = 3
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} GstStateChangeReturn;
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/* NOTE: this probably should be done with an #ifdef to decide
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* whether to safe-cast or to just do the non-checking cast.
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*/
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/**
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* GST_STATE:
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* @obj: Element to return state for.
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*
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* This macro returns the current state of the element.
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*/
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#define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
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/**
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* GST_STATE_PENDING:
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* @obj: Element to return the pending state for.
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*
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* This macro returns the currently pending state of the element.
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*/
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#define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
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#define GST_STATE_FINAL(obj) (GST_ELEMENT(obj)->final_state)
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#define GST_STATE_ERROR(obj) (GST_ELEMENT(obj)->state_error)
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#define GST_STATE_NO_PREROLL(obj) (GST_ELEMENT(obj)->no_preroll)
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#ifndef GST_DEBUG_STATE_CHANGE
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#define GST_STATE_CHANGE(obj) ((1<<(GST_STATE(obj)+8)) | 1<<GST_STATE_PENDING(obj))
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#else
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inline GstStateChange
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_gst_element_get_state_change (GstElement *e)
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{
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if (e->state < GST_STATE_NULL || e->state > GST_STATE_PLAYING)
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g_assert_not_reached ();
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if (e->pending_state < GST_STATE_NULL || e->pending_state > GST_STATE_PLAYING)
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g_assert_not_reached ();
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if (e->state - e->pending_state != 1 && e->pending_state - e->state != 1)
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g_assert_not_reached ();
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return (1<<(GST_STATE(obj)+8)) | 1<<GST_STATE_PENDING(obj);
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}
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#define GST_STATE_CHANGE(obj) _gst_element_get_state_change(obj)
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#endif
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/* FIXME: How to deal with lost_state ? */
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/**
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* GstStateChange:
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* @GST_STATE_CHANGE_NULL_TO_READY : state change from NULL to READY
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* @GST_STATE_CHANGE_READY_TO_PAUSED : state change from READY to PAUSED
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* @GST_STATE_CHANGE_PAUSED_TO_PLAYING: state change from PAUSED to PLAYING
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* @GST_STATE_CHANGE_PLAYING_TO_PAUSED: state change from PLAYING to PAUSED
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* @GST_STATE_CHANGE_PAUSED_TO_READY : state change from PAUSED to READY
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* @GST_STATE_CHANGE_READY_TO_NULL : state change from READY to NULL
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*/
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typedef enum /*< flags=0 >*/
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{
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GST_STATE_CHANGE_NULL_TO_READY = 1<<(GST_STATE_NULL+8) | 1<<GST_STATE_READY,
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GST_STATE_CHANGE_READY_TO_PAUSED = 1<<(GST_STATE_READY+8) | 1<<GST_STATE_PAUSED,
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GST_STATE_CHANGE_PAUSED_TO_PLAYING = 1<<(GST_STATE_PAUSED+8) | 1<<GST_STATE_PLAYING,
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GST_STATE_CHANGE_PLAYING_TO_PAUSED = 1<<(GST_STATE_PLAYING+8) | 1<<GST_STATE_PAUSED,
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GST_STATE_CHANGE_PAUSED_TO_READY = 1<<(GST_STATE_PAUSED+8) | 1<<GST_STATE_READY,
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GST_STATE_CHANGE_READY_TO_NULL = 1<<(GST_STATE_READY+8) | 1<<GST_STATE_NULL
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} GstStateChange;
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/**
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* GstElementFlags:
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* @GST_ELEMENT_LOCKED_STATE: ignore state changes from parent
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* @GST_ELEMENT_IS_SINK: the element is a sink
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* @GST_ELEMENT_UNPARENTING: Child is being removed from the parent bin.
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* gst_bin_remove() on a child already being removed immediately returns FALSE
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* @GST_ELEMENT_FLAG_LAST: offset to define more flags
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*
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* The standard flags that an element may have.
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*/
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typedef enum
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{
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GST_ELEMENT_LOCKED_STATE = GST_OBJECT_FLAG_LAST,
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GST_ELEMENT_IS_SINK,
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GST_ELEMENT_UNPARENTING,
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GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 16
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} GstElementFlags;
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/**
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* GST_ELEMENT_IS_LOCKED_STATE:
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* @obj: A #GstElement to query
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*
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* Check if the element is in the loacked state and therefore will ignore state
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* changes from its parent object.
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*/
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#define GST_ELEMENT_IS_LOCKED_STATE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_LOCKED_STATE))
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/**
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* GST_ELEMENT_NAME:
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* @obj: A #GstElement to query
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*
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* Gets the name of this element. Use only in core as this is not
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* ABI-compatible. Others use gst_element_get_name()
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*/
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#define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
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/**
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* GST_ELEMENT_PARENT:
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* @obj: A #GstElement to query
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*
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* Get the parent object of this element.
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*/
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#define GST_ELEMENT_PARENT(obj) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(obj)))
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/**
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* GST_ELEMENT_BUS:
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* @obj: A #GstElement to query
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*
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* Get the message bus of this element.
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*/
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#define GST_ELEMENT_BUS(obj) (GST_ELEMENT_CAST(obj)->bus)
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/**
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* GST_ELEMENT_CLOCK:
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* @obj: A #GstElement to query
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*
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* Get the clock of this element
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*/
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#define GST_ELEMENT_CLOCK(obj) (GST_ELEMENT_CAST(obj)->clock)
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/**
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* GST_ELEMENT_PADS:
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* @obj: A #GstElement to query
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*
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* Get the pads of this elements.
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*/
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#define GST_ELEMENT_PADS(obj) (GST_ELEMENT_CAST(obj)->pads)
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/**
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* GST_ELEMENT_ERROR:
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* @el: the element that throws the error
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* @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #GstError)
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* @code: error code defined for that domain (see #GstError)
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* @text: the message to display (format string and args enclosed in
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parentheses)
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* @debug: debugging information for the message (format string and args
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enclosed in parentheses)
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*
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* Utility function that elements can use in case they encountered a fatal
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* data processing error. The pipeline will throw an error signal and the
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* application will be requested to stop further media processing.
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*/
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#define GST_ELEMENT_ERROR(el, domain, code, text, debug) \
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G_STMT_START { \
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gchar *__txt = _gst_element_error_printf text; \
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gchar *__dbg = _gst_element_error_printf debug; \
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if (__txt) \
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GST_WARNING_OBJECT (el, "error: %s", __txt); \
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if (__dbg) \
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GST_WARNING_OBJECT (el, "error: %s", __dbg); \
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gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_ERROR, \
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GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
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__txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
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} G_STMT_END
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/**
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* GST_ELEMENT_WARNING:
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* @el: the element that throws the error
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* @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #GstError)
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* @code: error code defined for that domain (see #GstError)
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* @text: the message to display (format string and args enclosed in
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parentheses)
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* @debug: debugging information for the message (format string and args
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enclosed in parentheses)
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*
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* Utility function that elements can use in case they encountered a non-fatal
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* data processing problem. The pipeline will throw a warning signal and the
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* application will be informed.
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*/
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#define GST_ELEMENT_WARNING(el, domain, code, text, debug) \
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G_STMT_START { \
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gchar *__txt = _gst_element_error_printf text; \
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gchar *__dbg = _gst_element_error_printf debug; \
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if (__txt) \
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GST_WARNING_OBJECT (el, "warning: %s", __txt); \
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if (__dbg) \
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GST_WARNING_OBJECT (el, "warning: %s", __dbg); \
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gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_WARNING, \
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GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
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__txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
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} G_STMT_END
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/* the state change mutexes and conds */
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#define GST_STATE_GET_LOCK(elem) (GST_ELEMENT_CAST(elem)->state_lock)
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/**
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* GST_STATE_LOCK:
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* @elem: the #GstElement to take the state lock on
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*
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* Takes the state lock on the element.
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* This function is used by the core. It is taken while getting or setting
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* the state, during state changes, and while finalizing.
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*/
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#define GST_STATE_LOCK(elem) g_static_rec_mutex_lock(GST_STATE_GET_LOCK(elem))
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#define GST_STATE_TRYLOCK(elem) g_static_rec_mutex_trylock(GST_STATE_GET_LOCK(elem))
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#define GST_STATE_UNLOCK(elem) g_static_rec_mutex_unlock(GST_STATE_GET_LOCK(elem))
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#define GST_STATE_UNLOCK_FULL(elem) g_static_rec_mutex_unlock_full(GST_STATE_GET_LOCK(elem))
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#define GST_STATE_LOCK_FULL(elem,t) g_static_rec_mutex_lock_full(GST_STATE_GET_LOCK(elem), t)
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#define GST_STATE_GET_COND(elem) (GST_ELEMENT_CAST(elem)->state_cond)
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#define GST_STATE_WAIT(elem) g_static_rec_cond_wait (GST_STATE_GET_COND (elem), \
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GST_STATE_GET_LOCK (elem))
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#define GST_STATE_TIMED_WAIT(elem, timeval) g_static_rec_cond_timed_wait (GST_STATE_GET_COND (elem), \
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GST_STATE_GET_LOCK (elem), timeval)
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#define GST_STATE_SIGNAL(elem) g_cond_signal (GST_STATE_GET_COND (elem));
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#define GST_STATE_BROADCAST(elem) g_cond_broadcast (GST_STATE_GET_COND (elem));
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struct _GstElement
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{
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GstObject object;
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/*< public >*/ /* with STATE_LOCK */
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/* element state */
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GStaticRecMutex *state_lock;
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GCond *state_cond;
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guint8 current_state;
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guint8 pending_state;
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guint8 final_state;
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gboolean state_error; /* Flag is set when the element has an
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* error in the last state change.
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* It is cleared when doing another
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* state change. */
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gboolean no_preroll; /* Flag is set when the element cannot
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* preroll */
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/*< public >*/ /* with LOCK */
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GstBus *bus;
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/* allocated clock */
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GstClock *clock;
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GstClockTimeDiff base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
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/* element pads, these lists can only be iterated while holding
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* the LOCK or checking the cookie after each LOCK. */
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guint16 numpads;
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GList *pads;
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guint16 numsrcpads;
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GList *srcpads;
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guint16 numsinkpads;
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GList *sinkpads;
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guint32 pads_cookie;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstElementClass
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{
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GstObjectClass parent_class;
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/*< public >*/
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/* the element details */
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GstElementDetails details;
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/* factory that the element was created from */
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GstElementFactory *elementfactory;
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/* templates for our pads */
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GList *padtemplates;
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gint numpadtemplates;
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guint32 pad_templ_cookie;
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/*< private >*/
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/* signal callbacks */
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void (*state_changed) (GstElement *element, GstState old, GstState state);
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void (*pad_added) (GstElement *element, GstPad *pad);
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void (*pad_removed) (GstElement *element, GstPad *pad);
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void (*no_more_pads) (GstElement *element);
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/*< public >*/
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/* virtual methods for subclasses */
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/* request/release pads */
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GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
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void (*release_pad) (GstElement *element, GstPad *pad);
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/* state changes */
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GstStateChangeReturn (*get_state) (GstElement * element, GstState * state,
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GstState * pending, GTimeVal * timeout);
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GstStateChangeReturn (*change_state) (GstElement *element, GstStateChange transition);
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/* bus */
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void (*set_bus) (GstElement * element, GstBus * bus);
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/* set/get clocks */
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GstClock* (*provide_clock) (GstElement *element);
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void (*set_clock) (GstElement *element, GstClock *clock);
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/* index */
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GstIndex* (*get_index) (GstElement *element);
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void (*set_index) (GstElement *element, GstIndex *index);
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/* query functions */
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gboolean (*send_event) (GstElement *element, GstEvent *event);
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const GstQueryType* (*get_query_types) (GstElement *element);
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gboolean (*query) (GstElement *element, GstQuery *query);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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/* element class pad templates */
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void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
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GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
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GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
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void gst_element_class_set_details (GstElementClass *klass,
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const GstElementDetails *details);
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/* element instance */
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GType gst_element_get_type (void);
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/* basic name and parentage stuff from GstObject */
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/**
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* gst_element_get_name:
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* @elem: a #GstElement to set the name of.
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*
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* Gets the name of the element.
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*/
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#define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT(elem))
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/**
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* gst_element_set_name:
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* @elem: a #GstElement to set the name of.
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* @name: the new name
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*
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* Sets the name of the element, getting rid of the old name if there was one.
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*/
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#define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT(elem),name)
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/**
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* gst_element_get_parent:
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* @elem: a #GstElement to get the parent of.
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*
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* Gets the parent of an element.
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*/
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#define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT(elem))
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/**
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* gst_element_set_parent:
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* @elem: a #GstElement to set the parent of.
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* @parent: the new parent #GstObject of the element.
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*
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* Sets the parent of an element.
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*/
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#define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT(elem),parent)
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/* clocking */
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gboolean gst_element_requires_clock (GstElement *element);
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gboolean gst_element_provides_clock (GstElement *element);
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GstClock* gst_element_provide_clock (GstElement *element);
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GstClock* gst_element_get_clock (GstElement *element);
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void gst_element_set_clock (GstElement *element, GstClock *clock);
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void gst_element_set_base_time (GstElement *element, GstClockTime time);
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GstClockTime gst_element_get_base_time (GstElement *element);
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/* indexes */
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gboolean gst_element_is_indexable (GstElement *element);
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void gst_element_set_index (GstElement *element, GstIndex *index);
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GstIndex* gst_element_get_index (GstElement *element);
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/* bus */
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void gst_element_set_bus (GstElement * element, GstBus * bus);
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GstBus * gst_element_get_bus (GstElement * element);
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/* pad management */
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gboolean gst_element_add_pad (GstElement *element, GstPad *pad);
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gboolean gst_element_remove_pad (GstElement *element, GstPad *pad);
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void gst_element_no_more_pads (GstElement *element);
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GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
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GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
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GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
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void gst_element_release_request_pad (GstElement *element, GstPad *pad);
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GstIterator * gst_element_iterate_pads (GstElement * element);
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GstIterator * gst_element_iterate_src_pads (GstElement * element);
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GstIterator * gst_element_iterate_sink_pads (GstElement * element);
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/* event/query/format stuff */
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gboolean gst_element_send_event (GstElement *element, GstEvent *event);
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gboolean gst_element_seek (GstElement *element, gdouble rate,
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GstFormat format, GstSeekFlags flags,
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GstSeekType cur_type, gint64 cur,
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GstSeekType stop_type, gint64 stop);
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G_CONST_RETURN GstQueryType*
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gst_element_get_query_types (GstElement *element);
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gboolean gst_element_query (GstElement *element, GstQuery *query);
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/* messages */
|
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gboolean gst_element_post_message (GstElement * element, GstMessage * message);
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/* error handling */
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gchar * _gst_element_error_printf (const gchar *format, ...);
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void gst_element_message_full (GstElement * element, GstMessageType type,
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GQuark domain, gint code, gchar * text,
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gchar * debug, const gchar * file,
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const gchar * function, gint line);
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/* state management */
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gboolean gst_element_is_locked_state (GstElement *element);
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gboolean gst_element_set_locked_state (GstElement *element, gboolean locked_state);
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gboolean gst_element_sync_state_with_parent (GstElement *element);
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GstStateChangeReturn gst_element_get_state (GstElement * element,
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GstState * state,
|
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GstState * pending,
|
|
GTimeVal * timeout);
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GstStateChangeReturn gst_element_set_state (GstElement *element, GstState state);
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void gst_element_abort_state (GstElement * element);
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void gst_element_commit_state (GstElement * element);
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void gst_element_lost_state (GstElement * element);
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/* factory management */
|
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GstElementFactory* gst_element_get_factory (GstElement *element);
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G_END_DECLS
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#endif /* __GST_ELEMENT_H__ */
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