mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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a80b0c26d5
Original commit message from CVS: Added DEBUG, INFO, and ERROR systems. Very little code is converted yet. Policy decisions need to be made as to what kinds of cases get what kind of response, and what the default ERROR response should be. Right now it will print out all the information, then have gdb spew a stack trace.
249 lines
8.3 KiB
C
249 lines
8.3 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 <gnome-xml/parser.h>
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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 = -1,
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GST_STATE_NULL = 0,
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GST_STATE_READY = 1,
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GST_STATE_PLAYING = 2,
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GST_STATE_PAUSED = 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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static inline char *_gst_print_statename(int state) {
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switch (state) {
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case -1: return "none pending";break;
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case 0: return "null";break;
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case 1: return "ready";break;
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case 2: return "playing";break;
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case 3: return "paused";break;
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default: return "";
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}
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return "";
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}
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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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#define GST_STATE_TRANSITION(obj) ((GST_STATE(obj)<<4) | GST_STATE_PENDING(obj))
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#define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<4) | GST_STATE_READY)
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#define GST_STATE_READY_TO_PLAYING ((GST_STATE_READY<<4) | GST_STATE_PLAYING)
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#define GST_STATE_PLAYING_TO_PAUSED ((GST_STATE_PLAYING<<4) | GST_STATE_PAUSED)
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#define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<4) | GST_STATE_PLAYING)
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#define GST_STATE_PLAYING_TO_READY ((GST_STATE_PLAYING<<4) | GST_STATE_READY)
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#define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<4) | 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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/* 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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/* use some padding for future expansion */
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GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8,
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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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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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gchar *name;
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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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};
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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 (*new_ghost_pad) (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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/* change the element state */
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GstElementStateReturn (*change_state) (GstElement *element);
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/* create or read XML representation of self */
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xmlNodePtr (*save_thyself) (GstElement *element, xmlNodePtr parent);
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void (*restore_thyself) (GstElement *element, xmlNodePtr self, GHashTable *elements);
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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, kinda */
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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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};
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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, gchar *name);
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const gchar* gst_element_get_name (GstElement *element);
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void gst_element_set_manager (GstElement *element, GstElement *manager);
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GstElement* gst_element_get_manager (GstElement *element);
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void gst_element_add_pad (GstElement *element, GstPad *pad);
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GstPad* gst_element_get_pad (GstElement *element, 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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void gst_element_add_ghost_pad (GstElement *element, GstPad *pad);
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void gst_element_connect (GstElement *src, gchar *srcpadname,
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GstElement *dest, 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, 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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xmlNodePtr gst_element_save_thyself (GstElement *element, xmlNodePtr parent);
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GstElement* gst_element_load_thyself (xmlNodePtr parent, GHashTable *elements);
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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 (gchar *name,GtkType type,
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GstElementDetails *details);
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void gst_elementfactory_destroy (GstElementFactory *elementfactory);
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void gst_elementfactory_add_padtemplate (GstElementFactory *elementfactory,
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GstPadTemplate *temp);
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GstElementFactory* gst_elementfactory_find (gchar *name);
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GList* gst_elementfactory_get_list (void);
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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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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 (gchar *factoryname, 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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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_ELEMENT_H__ */
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