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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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284 lines
10 KiB
C
284 lines
10 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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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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#include <parser.h> // NOTE: this is xml-config's fault
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// Include compatability defines: if libxml hasn't already defined these,
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// we have an old version 1.x
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#ifndef xmlChildrenNode
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#define xmlChildrenNode childs
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#define xmlRootNode root
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#endif
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#include <gst/gstobject.h>
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#include <gst/gstpad.h>
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#include <gst/cothreads.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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typedef enum {
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GST_STATE_NONE_PENDING = 0,
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GST_STATE_NULL = (1 << 0),
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GST_STATE_READY = (1 << 1),
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GST_STATE_PAUSED = (1 << 2),
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GST_STATE_PLAYING = (1 << 3),
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} GstElementState;
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typedef enum {
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GST_STATE_FAILURE = 0,
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GST_STATE_SUCCESS = 1,
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GST_STATE_ASYNC = 2,
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} GstElementStateReturn;
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// NOTE: this probably should be done with an #ifdef to decide whether to safe-cast
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// or to just do the non-checking cast.
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#define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
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#define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
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// Note: using 8 bit shift mostly "just because", it leaves us enough room to grow <g>
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#define GST_STATE_TRANSITION(obj) ((GST_STATE(obj)<<8) | GST_STATE_PENDING(obj))
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#define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<8) | GST_STATE_READY)
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#define GST_STATE_READY_TO_PAUSED ((GST_STATE_READY<<8) | GST_STATE_PAUSED)
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#define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<8) | GST_STATE_PLAYING)
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#define GST_STATE_PLAYING_TO_PAUSED ((GST_STATE_PLAYING<<8) | GST_STATE_PAUSED)
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#define GST_STATE_PAUSED_TO_READY ((GST_STATE_PAUSED<<8) | GST_STATE_READY)
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#define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<8) | GST_STATE_NULL)
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#define GST_TYPE_ELEMENT \
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(gst_element_get_type())
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#define GST_ELEMENT(obj) \
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(GTK_CHECK_CAST((obj),GST_TYPE_ELEMENT,GstElement))
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#define GST_ELEMENT_CLASS(klass) \
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(GTK_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT,GstElementClass))
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#define GST_IS_ELEMENT(obj) \
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(GTK_CHECK_TYPE((obj),GST_TYPE_ELEMENT))
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#define GST_IS_ELEMENT_CLASS(klass) \
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(GTK_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT))
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typedef enum {
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/* element is complex (for some def.) and generally require a cothread */
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GST_ELEMENT_COMPLEX = GST_OBJECT_FLAG_LAST,
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/* input and output pads aren't directly coupled to each other
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examples: queues, multi-output async readers, etc. */
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GST_ELEMENT_DECOUPLED,
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/* this element should be placed in a thread if at all possible */
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GST_ELEMENT_THREAD_SUGGESTED,
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/* this element is incable of seeking (FIXME: does this apply to filters?) */
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GST_ELEMENT_NO_SEEK,
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/***** !!!!! need to have a flag that says that an element must
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*not* be an entry into a scheduling chain !!!!! *****/
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/* this element for some reason doesn't obey COTHREAD_STOPPING, or
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has some other reason why it can't be the entry */
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GST_ELEMENT_NO_ENTRY,
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/* there is a new loopfunction ready for placement */
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GST_ELEMENT_NEW_LOOPFUNC,
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/* the cothread holding this element needs to be stopped */
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GST_ELEMENT_COTHREAD_STOPPING,
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/* the element has to be scheduled as a cothread for any sanity */
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GST_ELEMENT_USE_COTHREAD,
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/* if this element is in EOS */
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GST_ELEMENT_EOS,
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/* use some padding for future expansion */
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GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 12,
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} GstElementFlags;
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#define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
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#define GST_ELEMENT_IS_COTHREAD_STOPPING(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_COTHREAD_STOPPING))
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#define GST_ELEMENT_IS_EOS(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
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#define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
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#define GST_ELEMENT_PARENT(obj) (GST_OBJECT_PARENT(obj))
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#define GST_ELEMENT_MANAGER(obj) (((GstElement*)(obj))->manager)
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#define GST_ELEMENT_SCHED(obj) (((GstElement*)(obj))->sched)
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#define GST_ELEMENT_PADS(obj) ((obj)->pads)
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//typedef struct _GstElement GstElement;
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//typedef struct _GstElementClass GstElementClass;
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typedef struct _GstElementDetails GstElementDetails;
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typedef struct _GstElementFactory GstElementFactory;
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typedef void (*GstElementLoopFunction) (GstElement *element);
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struct _GstElement {
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GstObject object;
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guint8 current_state;
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guint8 pending_state;
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GstElementLoopFunction loopfunc;
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cothread_state *threadstate;
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guint16 numpads;
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guint16 numsrcpads;
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guint16 numsinkpads;
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GList *pads;
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GstElement *manager;
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GstSchedule *sched;
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};
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struct _GstElementClass {
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GstObjectClass parent_class;
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/* the elementfactory that created us */
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GstElementFactory *elementfactory;
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/* signal callbacks */
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void (*state_change) (GstElement *element,GstElementState state);
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void (*new_pad) (GstElement *element,GstPad *pad);
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void (*pad_removed) (GstElement *element,GstPad *pad);
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void (*new_ghost_pad) (GstElement *element,GstPad *pad);
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void (*ghost_pad_removed) (GstElement *element,GstPad *pad);
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void (*error) (GstElement *element,gchar *error);
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void (*eos) (GstElement *element);
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/* local pointers for get/set */
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void (*set_arg) (GtkObject *object,
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GtkArg *arg,
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guint arg_id);
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void (*get_arg) (GtkObject *object,
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GtkArg *arg,
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guint arg_id);
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/* change the element state */
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GstElementStateReturn (*change_state) (GstElement *element);
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/* request a new pad */
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GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ);
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};
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struct _GstElementDetails {
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gchar *longname; /* long, english name */
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gchar *klass; /* type of element, as hierarchy */
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gchar *description; /* insights of one form or another */
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gchar *version; /* version of the element */
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gchar *author; /* who wrote this thing? */
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gchar *copyright; /* copyright details (year, etc.) */
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};
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struct _GstElementFactory {
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gchar *name; /* name of element */
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GtkType type; /* unique GtkType of element */
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GstElementDetails *details; /* pointer to details struct */
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GList *padtemplates;
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guint16 numpadtemplates;
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};
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GtkType gst_element_get_type (void);
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GstElement* gst_element_new (void);
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#define gst_element_destroy(element) gst_object_destroy (GST_OBJECT (element))
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void gst_element_set_loop_function (GstElement *element,
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GstElementLoopFunction loop);
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void gst_element_set_name (GstElement *element, const gchar *name);
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const gchar* gst_element_get_name (GstElement *element);
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void gst_element_set_parent (GstElement *element, GstObject *parent);
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GstObject* gst_element_get_parent (GstElement *element);
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void gst_element_set_sched (GstElement *element, GstSchedule *sched);
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GstSchedule* gst_element_get_sched (GstElement *element);
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void gst_element_add_pad (GstElement *element, GstPad *pad);
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void gst_element_remove_pad (GstElement *element, GstPad *pad);
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GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
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GList* gst_element_get_pad_list (GstElement *element);
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GList* gst_element_get_padtemplate_list (GstElement *element);
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GstPadTemplate* gst_element_get_padtemplate_by_name (GstElement *element, const guchar *name);
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void gst_element_add_ghost_pad (GstElement *element, GstPad *pad, gchar *name);
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void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
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GstPad* gst_element_request_compatible_pad (GstElement *element, GstPadTemplate *templ);
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GstPad* gst_element_request_pad_by_name (GstElement *element, const gchar *name);
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void gst_element_connect (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname);
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void gst_element_disconnect (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname);
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void gst_element_signal_eos (GstElement *element);
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/* called by the app to set the state of the element */
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gint gst_element_set_state (GstElement *element, GstElementState state);
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void gst_element_error (GstElement *element, const gchar *error);
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GstElementFactory* gst_element_get_factory (GstElement *element);
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/* XML write and read */
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GstElement* gst_element_restore_thyself (xmlNodePtr self, GstObject *parent);
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/*
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*
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* factories stuff
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*
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**/
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GstElementFactory* gst_elementfactory_new (const gchar *name,GtkType type,
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GstElementDetails *details);
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void gst_elementfactory_destroy (GstElementFactory *elementfactory);
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GstElementFactory* gst_elementfactory_find (const gchar *name);
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GList* gst_elementfactory_get_list (void);
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void gst_elementfactory_add_padtemplate (GstElementFactory *elementfactory,
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GstPadTemplate *templ);
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gboolean gst_elementfactory_can_src_caps (GstElementFactory *factory,
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GstCaps *caps);
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gboolean gst_elementfactory_can_sink_caps (GstElementFactory *factory,
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GstCaps *caps);
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GstElement* gst_elementfactory_create (GstElementFactory *factory,
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const gchar *name);
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/* FIXME this name is wrong, probably so is the one above it */
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GstElement* gst_elementfactory_make (const gchar *factoryname, const gchar *name);
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xmlNodePtr gst_elementfactory_save_thyself (GstElementFactory *factory, xmlNodePtr parent);
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GstElementFactory* gst_elementfactory_load_thyself (xmlNodePtr parent);
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const gchar * gst_element_statename (int state);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_ELEMENT_H__ */
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