gstreamer/gst/gstpad.h
Erik Walthinsen 9a0438ba93 Started work on better ghostpad management, and started to build the low- level EOS mechanism.
Original commit message from CVS:
Started work on better ghostpad management, and started to build the low-
level EOS mechanism.

Also removed a couple of printouts that aren't needed any more.
2000-12-31 22:18:05 +00:00

240 lines
7.7 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstpad.h: Header for GstPad object
*
* 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_PAD_H__
#define __GST_PAD_H__
#include <gnome-xml/parser.h>
#include <gst/gstobject.h>
#include <gst/gstbuffer.h>
#include <gst/cothreads.h>
#include <gst/gstcaps.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GST_TYPE_PAD (gst_pad_get_type ())
#define GST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PAD,GstPad))
#define GST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD,GstPadClass))
#define GST_IS_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PAD))
#define GST_IS_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
/* quick test to see if the pad is connected */
#define GST_PAD_CONNECTED(pad) ((pad) && (pad)->peer != NULL)
#define GST_PAD_CAN_PULL(pad) ((pad) && (pad)->pullfunc != NULL)
typedef struct _GstPad GstPad;
typedef struct _GstPadClass GstPadClass;
typedef struct _GstPadTemplate GstPadTemplate;
typedef struct _GstPadTemplateClass GstPadTemplateClass;
/* this defines the functions used to chain buffers
* pad is the sink pad (so the same chain function can be used for N pads)
* buf is the buffer being passed */
typedef void (*GstPadChainFunction) (GstPad *pad,GstBuffer *buf);
typedef GstBuffer *(*GstPadGetFunction) (GstPad *pad);
typedef GstBuffer *(*GstPadGetRegionFunction) (GstPad *pad, gulong offset, gulong size);
typedef void (*GstPadQoSFunction) (GstPad *pad, glong qos_message);
typedef void (*GstPadPushFunction) (GstPad *pad, GstBuffer *buf);
typedef GstBuffer *(*GstPadPullFunction) (GstPad *pad);
typedef GstBuffer *(*GstPadPullRegionFunction) (GstPad *pad, gulong offset, gulong size);
typedef gboolean (*GstPadEOSFunction) (GstPad *pad);
typedef enum {
GST_PAD_UNKNOWN,
GST_PAD_SRC,
GST_PAD_SINK,
} GstPadDirection;
typedef enum {
GST_PAD_DISABLED = GST_OBJECT_FLAG_LAST,
GST_PAD_EOS,
GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4,
} GstPadFlags;
struct _GstPad {
GstObject object;
gchar *name;
GList *caps;
cothread_state *threadstate;
GstPadDirection direction;
GstPad *peer;
GstBuffer *bufpen;
GstPadChainFunction chainfunc;
GstPadGetFunction getfunc;
GstPadGetRegionFunction getregionfunc;
GstPadQoSFunction qosfunc;
GstPadPushFunction pushfunc;
GstPadPullFunction pullfunc;
GstPadPullRegionFunction pullregionfunc;
GstPadEOSFunction eosfunc;
GstObject *parent;
GList *ghostparents;
GstPadTemplate *padtemplate; /* the template for this pad */
};
struct _GstPadClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*set_active) (GstPad *pad, gboolean active);
void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
void (*eos) (GstPad *pad);
};
/* template */
#define GST_TYPE_PADTEMPLATE (gst_padtemplate_get_type ())
#define GST_PADTEMPLATE(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PADTEMPLATE,GstPad))
#define GST_PADTEMPLATE_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PADTEMPLATE,GstPadClass))
#define GST_IS_PADTEMPLATE(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PADTEMPLATE))
#define GST_IS_PADTEMPLATE_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PADTEMPLATE))
typedef enum {
GST_PAD_ALWAYS,
GST_PAD_SOMETIMES,
} GstPadPresence;
struct _GstPadTemplate {
GstObject object;
gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GList *caps;
};
struct _GstPadTemplateClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*pad_created) (GstPadTemplate *temp, GstPad *pad);
};
/* factory */
typedef gpointer GstPadFactoryEntry;
typedef GstPadFactoryEntry GstPadFactory[];
#define GST_PAD_FACTORY_ALWAYS GINT_TO_POINTER(GST_PAD_ALWAYS)
#define GST_PAD_FACTORY_SOMETIMES GINT_TO_POINTER(GST_PAD_SOMETIMES)
#define GST_PAD_FACTORY_SRC GINT_TO_POINTER(GST_PAD_SRC)
#define GST_PAD_FACTORY_SINK GINT_TO_POINTER(GST_PAD_SINK)
#define GST_PAD_FACTORY_CAPS(a...) GINT_TO_POINTER(1),##a,NULL
GtkType gst_pad_get_type (void);
GstPad* gst_pad_new (gchar *name, GstPadDirection direction);
#define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad))
GstPad* gst_pad_new_from_template (GstPadTemplate *temp, gchar *name);
GstPadDirection gst_pad_get_direction (GstPad *pad);
void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get);
void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion);
void gst_pad_set_qos_function (GstPad *pad, GstPadQoSFunction qos);
void gst_pad_set_eos_function (GstPad *pad, GstPadEOSFunction eos);
void gst_pad_set_caps_list (GstPad *pad, GList *caps);
GList* gst_pad_get_caps_list (GstPad *pad);
GstCaps* gst_pad_get_caps_by_name (GstPad *pad, gchar *name);
gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
void gst_pad_set_name (GstPad *pad, const gchar *name);
const gchar* gst_pad_get_name (GstPad *pad);
void gst_pad_set_parent (GstPad *pad, GstObject *parent);
GstObject* gst_pad_get_parent (GstPad *pad);
void gst_pad_add_ghost_parent (GstPad *pad, GstObject *parent);
void gst_pad_remove_ghost_parent (GstPad *pad, GstObject *parent);
GList* gst_pad_get_ghost_parents (GstPad *pad);
GstPad* gst_pad_get_peer (GstPad *pad);
void gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
#if 1
void gst_pad_push (GstPad *pad, GstBuffer *buffer);
#else
#define gst_pad_push(pad,buf) G_STMT_START{ \
if ((pad)->peer->pushfunc) ((pad)->peer->pushfunc)((pad)->peer,(buf)); \
}G_STMT_END
#endif
#if 1
GstBuffer* gst_pad_pull (GstPad *pad);
GstBuffer* gst_pad_pull_region (GstPad *pad, gulong offset, gulong size);
#else
#define gst_pad_pull(pad) \
(((pad)->peer->pullfunc) ? ((pad)->peer->pullfunc)((pad)->peer) : NULL)
#define gst_pad_pullregion(pad,offset,size) \
(((pad)->peer->pullregionfunc) ? ((pad)->peer->pullregionfunc)((pad)->peer,(offset),(size)) : NULL)
#endif
#define gst_pad_eos(pad) ((pad)->peer->eosfunc((pad)->peer))
gboolean gst_pad_set_eos (GstPad *pad);
void gst_pad_handle_qos (GstPad *pad, glong qos_message);
xmlNodePtr gst_pad_save_thyself (GstPad *pad, xmlNodePtr parent);
void gst_pad_load_and_connect (xmlNodePtr parent, GstObject *element, GHashTable *elements);
/* templates and factories */
GtkType gst_padtemplate_get_type (void);
GstPadTemplate* gst_padtemplate_new (GstPadFactory *factory);
GstPadTemplate* gst_padtemplate_create (gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GList *caps);
xmlNodePtr gst_padtemplate_save_thyself (GstPadTemplate *pad, xmlNodePtr parent);
GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_PAD_H__ */