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gstreamer/gst/gstelement.h
David Schleef fc35aeeaad Add gst_element_class_get_pad_template() 
Original commit message from CVS:
Add gst_element_class_get_pad_template()
2003-11-08 23:28:04 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstelement.h: Header for GstElement
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_ELEMENT_H__
#define __GST_ELEMENT_H__
#include <gst/gstconfig.h>
#include <gst/gsttypes.h>
#include <gst/gstobject.h>
#include <gst/gstpad.h>
#include <gst/gstclock.h>
#include <gst/gstplugin.h>
#include <gst/gstpluginfeature.h>
#include <gst/gstindex.h>
G_BEGIN_DECLS
typedef struct _GstElementDetails GstElementDetails;
/* FIXME: need translatable stuff in here (how handle in registry)? */
struct _GstElementDetails {
gchar *longname; /* long, english name */
gchar *klass; /* type of element, as hierarchy */
gchar *description; /* insights of one form or another */
gchar *author; /* who wrote this thing? */
GST_STRUCT_PADDING
};
#define GST_ELEMENT_DETAILS(longname,klass,description,author) \
{ longname, klass, description, author, GST_STRUCT_PADDING_INIT }
#define GST_IS_ELEMENT_DETAILS(details) ( \
(details) && ((details)->longname != NULL) && ((details)->klass != NULL) \
&& ((details)->description != NULL) && ((details)->author != NULL))
#define GST_NUM_STATES 4
/* NOTE: this probably should be done with an #ifdef to decide
* whether to safe-cast or to just do the non-checking cast.
*/
#define GST_STATE(obj) (GST_ELEMENT(obj)->current_state)
#define GST_STATE_PENDING(obj) (GST_ELEMENT(obj)->pending_state)
/* Note: using 8 bit shift mostly "just because", it leaves us enough room to grow <g> */
#define GST_STATE_TRANSITION(obj) ((GST_STATE(obj)<<8) | GST_STATE_PENDING(obj))
#define GST_STATE_NULL_TO_READY ((GST_STATE_NULL<<8) | GST_STATE_READY)
#define GST_STATE_READY_TO_PAUSED ((GST_STATE_READY<<8) | GST_STATE_PAUSED)
#define GST_STATE_PAUSED_TO_PLAYING ((GST_STATE_PAUSED<<8) | GST_STATE_PLAYING)
#define GST_STATE_PLAYING_TO_PAUSED ((GST_STATE_PLAYING<<8) | GST_STATE_PAUSED)
#define GST_STATE_PAUSED_TO_READY ((GST_STATE_PAUSED<<8) | GST_STATE_READY)
#define GST_STATE_READY_TO_NULL ((GST_STATE_READY<<8) | GST_STATE_NULL)
extern GType _gst_element_type;
#define GST_TYPE_ELEMENT (_gst_element_type)
#define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
#define GST_ELEMENT_CLASS_CAST(klass) ((GstElementClass*)(klass))
#define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
#define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
#define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
#ifdef GST_TYPE_PARANOID
# define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
# define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
#else
# define GST_ELEMENT GST_ELEMENT_CAST
# define GST_ELEMENT_CLASS GST_ELEMENT_CLASS_CAST
#endif
/* convenience functions */
#ifdef G_HAVE_ISO_VARARGS
#define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, ...) \
GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, __VA_ARGS__);
#define GST_ELEMENT_FORMATS_FUNCTION(functionname, ...) \
GST_FORMATS_FUNCTION (GstElement*, functionname, __VA_ARGS__);
#define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, ...) \
GST_EVENT_MASK_FUNCTION (GstElement*, functionname, __VA_ARGS__);
#elif defined(G_HAVE_GNUC_VARARGS)
#define GST_ELEMENT_QUERY_TYPE_FUNCTION(functionname, a...) \
GST_QUERY_TYPE_FUNCTION (GstElement*, functionname, a);
#define GST_ELEMENT_FORMATS_FUNCTION(functionname, a...) \
GST_FORMATS_FUNCTION (GstElement*, functionname, a);
#define GST_ELEMENT_EVENT_MASK_FUNCTION(functionname, a...) \
GST_EVENT_MASK_FUNCTION (GstElement*, functionname, a);
#endif
typedef enum {
/* element is complex (for some def.) and generally require a cothread */
GST_ELEMENT_COMPLEX = GST_OBJECT_FLAG_LAST,
/* input and output pads aren't directly coupled to each other
examples: queues, multi-output async readers, etc. */
GST_ELEMENT_DECOUPLED,
/* this element should be placed in a thread if at all possible */
GST_ELEMENT_THREAD_SUGGESTED,
/* this element, for some reason, has a loop function that performs
* an infinite loop without calls to gst_element_yield () */
GST_ELEMENT_INFINITE_LOOP,
/* there is a new loopfunction ready for placement */
GST_ELEMENT_NEW_LOOPFUNC,
/* if this element can handle events */
GST_ELEMENT_EVENT_AWARE,
/* use threadsafe property get/set implementation */
GST_ELEMENT_USE_THREADSAFE_PROPERTIES,
/* private flags that can be used by the scheduler */
GST_ELEMENT_SCHEDULER_PRIVATE1,
GST_ELEMENT_SCHEDULER_PRIVATE2,
/* ignore state changes from parent */
GST_ELEMENT_LOCKED_STATE,
/* element is in error */
GST_ELEMENT_ERROR,
/* use some padding for future expansion */
GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 16
} GstElementFlags;
#define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
#define GST_ELEMENT_IS_EOS(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
#define GST_ELEMENT_IS_EVENT_AWARE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EVENT_AWARE))
#define GST_ELEMENT_IS_DECOUPLED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_DECOUPLED))
#define GST_ELEMENT_NAME(obj) (GST_OBJECT_NAME(obj))
#define GST_ELEMENT_PARENT(obj) (GST_OBJECT_PARENT(obj))
#define GST_ELEMENT_MANAGER(obj) (((GstElement*)(obj))->manager)
#define GST_ELEMENT_SCHED(obj) (((GstElement*)(obj))->sched)
#define GST_ELEMENT_CLOCK(obj) (((GstElement*)(obj))->clock)
#define GST_ELEMENT_PADS(obj) ((obj)->pads)
typedef struct _GstElementFactory GstElementFactory;
typedef struct _GstElementFactoryClass GstElementFactoryClass;
typedef void (*GstElementLoopFunction) (GstElement *element);
typedef void (*GstElementPreRunFunction) (GstElement *element);
typedef void (*GstElementPostRunFunction) (GstElement *element);
struct _GstElement {
GstObject object;
/* element state and scheduling */
guint8 current_state;
guint8 pending_state;
GstElementLoopFunction loopfunc;
GstScheduler *sched;
gpointer sched_private;
/* allocated clock */
GstClock *clock;
GstClockTime base_time;
/* element pads */
guint16 numpads;
guint16 numsrcpads;
guint16 numsinkpads;
GList *pads;
GMutex *state_mutex;
GCond *state_cond;
GstElementPreRunFunction pre_run_func;
GstElementPostRunFunction post_run_func;
GAsyncQueue *prop_value_queue;
GMutex *property_mutex;
GST_OBJECT_PADDING
};
struct _GstElementClass {
GstObjectClass parent_class;
/* the element details */
GstElementDetails details;
/* factory that the element was created from */
GstElementFactory *elementfactory;
/* templates for our pads */
GList *padtemplates;
gint numpadtemplates;
/* signal callbacks */
void (*state_change) (GstElement *element, GstElementState old, GstElementState state);
void (*new_pad) (GstElement *element, GstPad *pad);
void (*pad_removed) (GstElement *element, GstPad *pad);
void (*error) (GstElement *element, GstElement *source, gchar *error);
void (*eos) (GstElement *element);
/* local pointers for get/set */
void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
/* vtable*/
gboolean (*release_locks) (GstElement *element);
/* query/convert/events functions */
const GstEventMask* (*get_event_masks) (GstElement *element);
gboolean (*send_event) (GstElement *element, GstEvent *event);
const GstFormat* (*get_formats) (GstElement *element);
gboolean (*convert) (GstElement *element,
GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value);
const GstQueryType* (*get_query_types) (GstElement *element);
gboolean (*query) (GstElement *element, GstQueryType type,
GstFormat *format, gint64 *value);
/* change the element state */
GstElementStateReturn (*change_state) (GstElement *element);
/* request/release pads */
GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
void (*release_pad) (GstElement *element, GstPad *pad);
/* set/get clocks */
GstClock* (*get_clock) (GstElement *element);
void (*set_clock) (GstElement *element, GstClock *clock);
/* index */
GstIndex* (*get_index) (GstElement *element);
void (*set_index) (GstElement *element, GstIndex *index);
GST_CLASS_PADDING
};
void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
void gst_element_class_install_std_props (GstElementClass *klass,
const gchar *first_name, ...);
void gst_element_class_set_details (GstElementClass *klass,
GstElementDetails *details);
#define gst_element_default_deep_notify gst_object_default_deep_notify
void gst_element_default_error (GObject *object, GstObject *orig, gchar *error);
GType gst_element_get_type (void);
void gst_element_set_loop_function (GstElement *element,
GstElementLoopFunction loop);
#define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT(elem))
#define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT(elem),name)
#define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT(elem))
#define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT(elem),parent)
/* threadsafe versions of their g_object_* counterparts */
void gst_element_set (GstElement *element, const gchar *first_property_name, ...);
void gst_element_get (GstElement *element, const gchar *first_property_name, ...);
void gst_element_set_valist (GstElement *element, const gchar *first_property_name,
va_list var_args);
void gst_element_get_valist (GstElement *element, const gchar *first_property_name,
va_list var_args);
void gst_element_set_property (GstElement *element, const gchar *property_name,
const GValue *value);
void gst_element_get_property (GstElement *element, const gchar *property_name,
GValue *value);
void gst_element_enable_threadsafe_properties (GstElement *element);
void gst_element_disable_threadsafe_properties (GstElement *element);
void gst_element_set_pending_properties (GstElement *element);
/* clocking */
gboolean gst_element_requires_clock (GstElement *element);
gboolean gst_element_provides_clock (GstElement *element);
GstClock* gst_element_get_clock (GstElement *element);
void gst_element_set_clock (GstElement *element, GstClock *clock);
GstClockReturn gst_element_clock_wait (GstElement *element,
GstClockID id, GstClockTimeDiff *jitter);
/* indexs */
gboolean gst_element_is_indexable (GstElement *element);
void gst_element_set_index (GstElement *element, GstIndex *index);
GstIndex* gst_element_get_index (GstElement *element);
gboolean gst_element_release_locks (GstElement *element);
void gst_element_yield (GstElement *element);
gboolean gst_element_interrupt (GstElement *element);
void gst_element_set_scheduler (GstElement *element, GstScheduler *sched);
GstScheduler* gst_element_get_scheduler (GstElement *element);
void gst_element_add_pad (GstElement *element, GstPad *pad);
void gst_element_remove_pad (GstElement *element, GstPad *pad);
GstPad * gst_element_add_ghost_pad (GstElement *element, GstPad *pad, const gchar *name);
void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
void gst_element_release_request_pad (GstElement *element, GstPad *pad);
const GList* gst_element_get_pad_list (GstElement *element);
GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
GstCaps *filtercaps);
GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
GstPadTemplate* gst_element_get_pad_template (GstElement *element, const gchar *name);
GList* gst_element_get_pad_template_list (GstElement *element);
GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
gboolean gst_element_link (GstElement *src, GstElement *dest);
gboolean gst_element_link_many (GstElement *element_1,
GstElement *element_2, ...);
gboolean gst_element_link_filtered (GstElement *src, GstElement *dest,
GstCaps *filtercaps);
void gst_element_unlink (GstElement *src, GstElement *dest);
void gst_element_unlink_many (GstElement *element_1,
GstElement *element_2, ...);
gboolean gst_element_link_pads (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname);
gboolean gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname,
GstCaps *filtercaps);
void gst_element_unlink_pads (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname);
const GstEventMask* gst_element_get_event_masks (GstElement *element);
gboolean gst_element_send_event (GstElement *element, GstEvent *event);
gboolean gst_element_seek (GstElement *element, GstSeekType seek_type,
guint64 offset);
const GstQueryType* gst_element_get_query_types (GstElement *element);
gboolean gst_element_query (GstElement *element, GstQueryType type,
GstFormat *format, gint64 *value);
const GstFormat* gst_element_get_formats (GstElement *element);
gboolean gst_element_convert (GstElement *element,
GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value);
void gst_element_set_eos (GstElement *element);
void gst_element_error (GstElement *element, const gchar *error, ...);
gboolean gst_element_is_locked_state (GstElement *element);
void gst_element_set_locked_state (GstElement *element, gboolean locked_state);
gboolean gst_element_sync_state_with_parent (GstElement *element);
GstElementState gst_element_get_state (GstElement *element);
GstElementStateReturn gst_element_set_state (GstElement *element, GstElementState state);
void gst_element_wait_state_change (GstElement *element);
const gchar* gst_element_state_get_name (GstElementState state);
GstElementFactory* gst_element_get_factory (GstElement *element);
GstBin* gst_element_get_managing_bin (GstElement *element);
/*
*
* factories stuff
*
**/
#define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
#define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
GstElementFactory))
#define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
GstElementFactoryClass))
#define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
#define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
struct _GstElementFactory {
GstPluginFeature parent;
GType type; /* unique GType of element or 0 if not loaded */
GstElementDetails details;
GList * padtemplates;
guint numpadtemplates;
GST_OBJECT_PADDING
};
struct _GstElementFactoryClass {
GstPluginFeatureClass parent_class;
GST_CLASS_PADDING
};
GType gst_element_factory_get_type (void);
gboolean gst_element_register (GstPlugin *plugin,
const gchar *elementname,
guint rank,
GType type);
GstElementFactory * gst_element_factory_find (const gchar *name);
GType gst_element_factory_get_element_type (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_longname (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_klass (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_description (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_version (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_author (GstElementFactory *factory);
guint gst_element_factory_get_num_padtemplates (GstElementFactory *factory);
G_CONST_RETURN GList * gst_element_factory_get_padtemplates (GstElementFactory *factory);
GstElement* gst_element_factory_create (GstElementFactory *factory,
const gchar *name);
GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name);
gboolean gst_element_factory_can_src_caps (GstElementFactory *factory,
GstCaps *caps);
gboolean gst_element_factory_can_sink_caps (GstElementFactory *factory,
GstCaps *caps);
void __gst_element_factory_add_pad_template (GstElementFactory *elementfactory,
GstPadTemplate *templ);
G_END_DECLS
#endif /* __GST_ELEMENT_H__ */
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