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gstreamer/gst/gstelement.h
Andy Wingo a7fa31afef - if you call gst_element_request_pad_by_name() with, say "sink4" as the pad name and there is a "sink%d" template, t... 
Original commit message from CVS:
- if you call gst_element_request_pad_by_name() with, say "sink4" as the pad name
and there is a "sink%d" template, the request_new_pad function will be called.
this is to allow for, for example, requesting a certain channel on a multichannel
device.
- to this end, request_new_pad now has the following prototype:
GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar *name)
if request_pad_by_name was called with a name like "sink%d" (i.e. no parsing
was necessary) then NULL is passed as 'name'.
- all plugins that use request pads have been changed to the new api.

also, some incremental (untested) alsa updates, switching to the bytestream api...
2001-09-23 22:52:32 +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 <parser.h> // NOTE: this is xml-config's fault
// Include compatability defines: if libxml hasn't already defined these,
// we have an old version 1.x
#ifndef xmlChildrenNode
#define xmlChildrenNode childs
#define xmlRootNode root
#endif
#include <gst/gstobject.h>
#include <gst/gstpad.h>
#include <gst/cothreads.h>
#include <gst/gstpluginfeature.h>
#include <gst/gstdparammanager.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef enum {
GST_STATE_VOID_PENDING = 0,
GST_STATE_NULL = (1 << 0),
GST_STATE_READY = (1 << 1),
GST_STATE_PAUSED = (1 << 2),
GST_STATE_PLAYING = (1 << 3),
} GstElementState;
typedef enum {
GST_STATE_FAILURE = 0,
GST_STATE_SUCCESS = 1,
GST_STATE_ASYNC = 2,
} GstElementStateReturn;
// 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)
#define GST_TYPE_ELEMENT \
(gst_element_get_type())
#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))
#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))
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 is incable of seeking (FIXME: does this apply to filters?) */
GST_ELEMENT_NO_SEEK,
/***** !!!!! need to have a flag that says that an element must
*not* be an entry into a scheduling chain !!!!! *****/
/* this element for some reason doesn't obey COTHREAD_STOPPING, or
has some other reason why it can't be the entry */
GST_ELEMENT_NO_ENTRY,
/* there is a new loopfunction ready for placement */
GST_ELEMENT_NEW_LOOPFUNC,
/* the cothread holding this element needs to be stopped */
GST_ELEMENT_COTHREAD_STOPPING,
/* the element has to be scheduled as a cothread for any sanity */
GST_ELEMENT_USE_COTHREAD,
/* if this element is in EOS */
GST_ELEMENT_EOS,
/* use some padding for future expansion */
GST_ELEMENT_FLAG_LAST = GST_OBJECT_FLAG_LAST + 12,
} GstElementFlags;
#define GST_ELEMENT_IS_THREAD_SUGGESTED(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_THREAD_SUGGESTED))
#define GST_ELEMENT_IS_COTHREAD_STOPPING(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_COTHREAD_STOPPING))
#define GST_ELEMENT_IS_EOS(obj) (GST_FLAG_IS_SET(obj,GST_ELEMENT_EOS))
#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_PADS(obj) ((obj)->pads)
#define GST_ELEMENT_DPARAM_MANAGER(obj) ((obj)->dpman)
//typedef struct _GstElement GstElement;
//typedef struct _GstElementClass GstElementClass;
typedef struct _GstElementFactory GstElementFactory;
typedef struct _GstElementFactoryClass GstElementFactoryClass;
typedef void (*GstElementLoopFunction) (GstElement *element);
struct _GstElement {
GstObject object;
guint8 current_state;
guint8 pending_state;
GstElementLoopFunction loopfunc;
cothread_state *threadstate;
GstPad *select_pad;
guint16 numpads;
guint16 numsrcpads;
guint16 numsinkpads;
GList *pads;
GstElement *manager;
GstSchedule *sched;
GstDParamManager *dpman;
};
struct _GstElementClass {
GstObjectClass parent_class;
/* the elementfactory that created us */
GstElementFactory *elementfactory;
/* templates for our pads */
GList *padtemplates;
gint numpadtemplates;
/* signal callbacks */
void (*state_change) (GstElement *element,GstElementState state);
void (*new_pad) (GstElement *element,GstPad *pad);
void (*pad_removed) (GstElement *element,GstPad *pad);
void (*new_ghost_pad) (GstElement *element,GstPad *pad);
void (*ghost_pad_removed) (GstElement *element,GstPad *pad);
void (*error) (GstElement *element,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, const GValue *value, GParamSpec *pspec);
/* change the element state */
GstElementStateReturn (*change_state) (GstElement *element);
/* request a new pad */
GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
};
void gst_element_class_add_padtemplate (GstElementClass *element, GstPadTemplate *templ);
GType gst_element_get_type (void);
#define gst_element_destroy(element) gst_object_destroy (GST_OBJECT (element))
void gst_element_set_loop_function (GstElement *element,
GstElementLoopFunction loop);
void gst_element_set_name (GstElement *element, const gchar *name);
const gchar* gst_element_get_name (GstElement *element);
void gst_element_set_parent (GstElement *element, GstObject *parent);
GstObject* gst_element_get_parent (GstElement *element);
void gst_element_set_sched (GstElement *element, GstSchedule *sched);
GstSchedule* gst_element_get_sched (GstElement *element);
void gst_element_add_pad (GstElement *element, GstPad *pad);
void gst_element_remove_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
GList* gst_element_get_pad_list (GstElement *element);
GList* gst_element_get_padtemplate_list (GstElement *element);
GstPadTemplate* gst_element_get_padtemplate_by_name (GstElement *element, const guchar *name);
void gst_element_add_ghost_pad (GstElement *element, GstPad *pad, gchar *name);
void gst_element_remove_ghost_pad (GstElement *element, GstPad *pad);
GstPad* gst_element_request_compatible_pad (GstElement *element, GstPadTemplate *templ);
GstPad* gst_element_request_pad_by_name (GstElement *element, const gchar *name);
void gst_element_connect (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname);
void gst_element_disconnect (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname);
void gst_element_signal_eos (GstElement *element);
/* called by the app to set the state of the element */
gint gst_element_set_state (GstElement *element, GstElementState state);
const gchar * gst_element_statename (GstElementState state);
void gst_element_error (GstElement *element, const gchar *error);
GstElementFactory* gst_element_get_factory (GstElement *element);
/* XML write and read */
GstElement* gst_element_restore_thyself (xmlNodePtr self, GstObject *parent);
/*
*
* factories stuff
*
**/
typedef struct _GstElementDetails GstElementDetails;
struct _GstElementDetails {
gchar *longname; /* long, english name */
gchar *klass; /* type of element, as hierarchy */
gchar *description; /* insights of one form or another */
gchar *version; /* version of the element */
gchar *author; /* who wrote this thing? */
gchar *copyright; /* copyright details (year, etc.) */
};
#define GST_TYPE_ELEMENTFACTORY \
(gst_elementfactory_get_type())
#define GST_ELEMENTFACTORY(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENTFACTORY,GstElementFactory))
#define GST_ELEMENTFACTORY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENTFACTORY,GstElementFactoryClass))
#define GST_IS_ELEMENTFACTORY(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENTFACTORY))
#define GST_IS_ELEMENTFACTORY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENTFACTORY))
struct _GstElementFactory {
GstPluginFeature feature;
GType type; /* unique GType of element */
GstElementDetails *details; /* pointer to details struct */
GList *padtemplates;
guint16 numpadtemplates;
};
struct _GstElementFactoryClass {
GstPluginFeatureClass parent_class;
};
GType gst_elementfactory_get_type (void);
GstElementFactory* gst_elementfactory_new (const gchar *name,GType type,
GstElementDetails *details);
GstElementFactory* gst_elementfactory_find (const gchar *name);
const GList* gst_elementfactory_get_list (void);
void gst_elementfactory_add_padtemplate (GstElementFactory *elementfactory,
GstPadTemplate *templ);
gboolean gst_elementfactory_can_src_caps (GstElementFactory *factory,
GstCaps *caps);
gboolean gst_elementfactory_can_sink_caps (GstElementFactory *factory,
GstCaps *caps);
GstElement* gst_elementfactory_create (GstElementFactory *factory,
const gchar *name);
/* FIXME this name is wrong, probably so is the one above it */
GstElement* gst_elementfactory_make (const gchar *factoryname, const gchar *name);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_ELEMENT_H__ */
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