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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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356 lines
15 KiB
C
356 lines
15 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 <gst/gstconfig.h>
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#include <gst/gsttypes.h>
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#include <gst/gstobject.h>
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#include <gst/gstpad.h>
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#include <gst/gstclock.h>
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#include <gst/gstpluginfeature.h>
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G_BEGIN_DECLS
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#define GST_NUM_STATES 4
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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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#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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extern GType _gst_element_type;
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#define GST_TYPE_ELEMENT (_gst_element_type)
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#define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
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#define GST_ELEMENT_CLASS_CAST(klass) ((GstElementClass*)(klass))
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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(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
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#ifdef GST_TYPE_PARANOID
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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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#else
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# define GST_ELEMENT GST_ELEMENT_CAST
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# define GST_ELEMENT_CLASS GST_ELEMENT_CLASS_CAST
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#endif
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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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/* this element, for some reason, has a loop function that performs
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* an infinite loop without calls to gst_element_yield () */
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GST_ELEMENT_INFINITE_LOOP,
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/* there is a new loopfunction ready for placement */
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GST_ELEMENT_NEW_LOOPFUNC,
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/* if this element can handle events */
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GST_ELEMENT_EVENT_AWARE,
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/* use threadsafe property get/set implementation */
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GST_ELEMENT_USE_THREADSAFE_PROPERTIES,
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/* private flags that can be used by the scheduler */
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GST_ELEMENT_SCHEDULER_PRIVATE1,
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GST_ELEMENT_SCHEDULER_PRIVATE2,
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/* use some padding for future expansion */
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GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 16,
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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_EOS(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
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#define GST_ELEMENT_IS_EVENT_AWARE(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EVENT_AWARE))
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#define GST_ELEMENT_IS_DECOUPLED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_DECOUPLED))
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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_CLOCK(obj) (((GstElement*)(obj))->clock)
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#define GST_ELEMENT_PADS(obj) ((obj)->pads)
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typedef struct _GstElementFactory GstElementFactory;
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typedef struct _GstElementFactoryClass GstElementFactoryClass;
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typedef void (*GstElementLoopFunction) (GstElement *element);
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typedef void (*GstElementSetClockFunction) (GstElement *element, GstClock *clock);
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typedef GstClock* (*GstElementGetClockFunction) (GstElement *element);
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typedef void (*GstElementPreRunFunction) (GstElement *element);
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typedef void (*GstElementPostRunFunction) (GstElement *element);
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struct _GstElement {
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GstObject object;
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/* element state and scheduling */
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guint8 current_state;
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guint8 pending_state;
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GstElement *manager;
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GstElementLoopFunction loopfunc;
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GstScheduler *sched;
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gpointer sched_private;
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GstElementSetClockFunction setclockfunc;
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GstElementGetClockFunction getclockfunc;
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GstClock *clock;
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/* element pads */
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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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GstPad *select_pad;
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GMutex *state_mutex;
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GCond *state_cond;
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GstElementPreRunFunction pre_run_func;
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GstElementPostRunFunction post_run_func;
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GAsyncQueue *prop_value_queue;
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GMutex *property_mutex;
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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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/* templates for our pads */
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GList *padtemplates;
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gint numpadtemplates;
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/* signal callbacks */
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void (*state_change) (GstElement *element, GstElementState old, 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 (*error) (GstElement *element, GstElement *source, gchar *error);
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void (*eos) (GstElement *element);
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void (*deep_notify) (GstObject *object, GstObject *orig, GParamSpec *pspec);
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/* local pointers for get/set */
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void (*set_property) (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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void (*get_property) (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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/* vtable*/
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gboolean (*release_locks) (GstElement *element);
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gboolean (*send_event) (GstElement *element, GstEvent *event);
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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, const gchar* name);
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void (*release_pad) (GstElement *element, GstPad *pad);
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};
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void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
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void gst_element_class_install_std_props (GstElementClass *klass,
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const gchar *first_name, ...);
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GType gst_element_get_type (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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/* threadsafe versions of their g_object_* counterparts */
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void gst_element_set (GstElement *element, const gchar *first_property_name, ...);
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void gst_element_get (GstElement *element, const gchar *first_property_name, ...);
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void gst_element_set_valist (GstElement *element, const gchar *first_property_name,
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va_list var_args);
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void gst_element_get_valist (GstElement *element, const gchar *first_property_name,
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va_list var_args);
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void gst_element_set_property (GstElement *element, const gchar *property_name,
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const GValue *value);
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void gst_element_get_property (GstElement *element, const gchar *property_name,
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GValue *value);
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void gst_element_enable_threadsafe_properties (GstElement *element);
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void gst_element_disable_threadsafe_properties (GstElement *element);
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void gst_element_set_pending_properties (GstElement *element);
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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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GstClock* gst_element_get_clock (GstElement *element);
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void gst_element_set_clock (GstElement *element, GstClock *clock);
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GstClockReturn gst_element_clock_wait (GstElement *element, GstClock *clock,
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GstClockTime time, GstClockTimeDiff *jitter);
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gboolean gst_element_release_locks (GstElement *element);
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void gst_element_yield (GstElement *element);
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gboolean gst_element_interrupt (GstElement *element);
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void gst_element_set_scheduler (GstElement *element, GstScheduler *sched);
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GstScheduler* gst_element_get_scheduler (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_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_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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GList* gst_element_get_pad_list (GstElement *element);
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GstPad* gst_element_get_compatible_pad (GstElement *element, GstPad *pad);
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GstPad* gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad,
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GstCaps *filtercaps);
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/* unimplemented
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GstPad* gst_element_get_compatible_request_pad (GstElement *element, GstPadTemplate *templ);
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GstPad* gst_element_get_compatible_static_pad (GstElement *element, GstPadTemplate *templ);
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*/
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GstPadTemplate* gst_element_get_pad_template (GstElement *element, const guchar *name);
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GList* gst_element_get_pad_template_list (GstElement *element);
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GstPadTemplate* gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl);
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gboolean gst_element_connect (GstElement *src, GstElement *dest);
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gboolean gst_element_connect_many (GstElement *element_1, GstElement *element_2, ...);
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gboolean gst_element_connect_filtered (GstElement *src, GstElement *dest,
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GstCaps *filtercaps);
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void gst_element_disconnect (GstElement *src, GstElement *dest);
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void gst_element_disconnect_many (GstElement *element_1, GstElement *element_2, ...);
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gboolean gst_element_connect_pads (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname);
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gboolean gst_element_connect_pads_filtered (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname,
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GstCaps *filtercaps);
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void gst_element_disconnect_pads (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname);
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gboolean gst_element_send_event (GstElement *element, GstEvent *event);
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void gst_element_set_eos (GstElement *element);
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void gst_element_error (GstElement *element, const gchar *error, ...);
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GstElementState gst_element_get_state (GstElement *element);
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gint gst_element_set_state (GstElement *element, GstElementState state);
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void gst_element_wait_state_change (GstElement *element);
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const gchar* gst_element_state_get_name (GstElementState state);
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GstElementFactory* gst_element_get_factory (GstElement *element);
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GstBin* gst_element_get_managing_bin (GstElement *element);
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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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typedef struct _GstElementDetails GstElementDetails;
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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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#define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
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#define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
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GstElementFactory))
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#define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
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GstElementFactoryClass))
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#define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
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#define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
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#define GST_ELEMENT_RANK_PRIMARY 256
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#define GST_ELEMENT_RANK_SECONDARY 128
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#define GST_ELEMENT_RANK_MARGINAL 64
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#define GST_ELEMENT_RANK_NONE 0
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struct _GstElementFactory {
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GstPluginFeature feature;
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GType type; /* unique GType of element */
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guint details_dynamic : 1;
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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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guint16 rank; /* used by autoplug to prioritise elements to try */
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};
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struct _GstElementFactoryClass {
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GstPluginFeatureClass parent_class;
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};
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GType gst_element_factory_get_type (void);
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GstElementFactory* gst_element_factory_new (const gchar *name, GType type,
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GstElementDetails *details);
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GstElementFactory* gst_element_factory_find (const gchar *name);
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void gst_element_factory_add_pad_template (GstElementFactory *elementfactory,
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GstPadTemplate *templ);
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gboolean gst_element_factory_can_src_caps (GstElementFactory *factory,
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GstCaps *caps);
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gboolean gst_element_factory_can_sink_caps (GstElementFactory *factory,
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GstCaps *caps);
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GstElement* gst_element_factory_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_element_factory_make (const gchar *factoryname, const gchar *name);
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void gst_element_factory_set_rank (GstElementFactory *factory, guint16 rank);
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G_END_DECLS
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#endif /* __GST_ELEMENT_H__ */
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