2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
5 * gstpad.h: Header for GstPad object
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
27 #include <parser.h> // NOTE: This is xml-config's fault
29 // Include compatability defines: if libxml hasn't already defined these,
30 // we have an old version 1.x
31 #ifndef xmlChildrenNode
32 #define xmlChildrenNode childs
33 #define xmlRootNode root
36 #include <gst/gstobject.h>
37 #include <gst/gstbuffer.h>
38 #include <gst/cothreads.h>
39 #include <gst/gstcaps.h>
40 #include <gst/gstevent.h>
45 #endif /* __cplusplus */
48 #define GST_TYPE_PAD (gst_pad_get_type ())
49 #define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD,GstPad))
50 #define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD,GstPadClass))
51 #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
52 #define GST_IS_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
54 #define GST_TYPE_REAL_PAD (gst_real_pad_get_type ())
55 #define GST_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_REAL_PAD,GstRealPad))
56 #define GST_REAL_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD,GstRealPadClass))
57 #define GST_IS_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_REAL_PAD))
58 #define GST_IS_REAL_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
60 #define GST_TYPE_GHOST_PAD (gst_ghost_pad_get_type ())
61 #define GST_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_GHOST_PAD,GstGhostPad))
62 #define GST_GHOST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD,GstGhostPadClass))
63 #define GST_IS_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GHOST_PAD))
64 #define GST_IS_GHOST_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
67 //typedef struct _GstPad GstPad;
68 //typedef struct _GstPadClass GstPadClass;
69 typedef struct _GstRealPad GstRealPad;
70 typedef struct _GstRealPadClass GstRealPadClass;
71 typedef struct _GstGhostPad GstGhostPad;
72 typedef struct _GstGhostPadClass GstGhostPadClass;
73 //typedef struct _GstPadTemplate GstPadTemplate;
74 //typedef struct _GstPadTemplateClass GstPadTemplateClass;
79 GST_REGION_OFFSET_LEN,
84 GST_PAD_NEGOTIATE_FAIL,
85 GST_PAD_NEGOTIATE_AGREE,
86 GST_PAD_NEGOTIATE_TRY,
87 } GstPadNegotiateReturn;
90 /* this defines the functions used to chain buffers
91 * pad is the sink pad (so the same chain function can be used for N pads)
92 * buf is the buffer being passed */
93 typedef void (*GstPadChainFunction) (GstPad *pad,GstBuffer *buf);
94 typedef GstBuffer* (*GstPadGetFunction) (GstPad *pad);
95 typedef gboolean (*GstPadEventFunction) (GstPad *pad, void *event);
97 typedef GstBuffer* (*GstPadGetRegionFunction) (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
98 typedef GstBuffer* (*GstPadPullRegionFunction) (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
99 typedef GstPadNegotiateReturn (*GstPadNegotiateFunction) (GstPad *pad, GstCaps **caps, gpointer *data);
100 typedef void (*GstPadNewCapsFunction) (GstPad *pad, GstCaps *caps);
101 typedef GstBufferPool* (*GstPadBufferPoolFunction) (GstPad *pad);
110 GST_PAD_DISABLED = GST_OBJECT_FLAG_LAST,
113 GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4,
119 gpointer element_private;
121 GstPadTemplate *padtemplate; /* the template for this pad */
124 struct _GstPadClass {
125 GstObjectClass parent_class;
132 GstPadDirection direction;
134 cothread_state *threadstate;
139 GstRegionType regiontype;
145 GstPadChainFunction chainfunc;
146 GstPadChainFunction chainhandler;
147 GstPadGetFunction getfunc;
148 GstPadGetFunction gethandler;
150 GstPadEventFunction eventfunc;
151 GstPadEventFunction eventhandler;
153 GstPadGetRegionFunction getregionfunc;
154 GstPadPullRegionFunction pullregionfunc;
156 GstPadNegotiateFunction negotiatefunc;
157 GstPadNewCapsFunction newcapsfunc;
158 GstPadBufferPoolFunction bufferpoolfunc;
163 struct _GstRealPadClass {
164 GstPadClass parent_class;
166 /* signal callbacks */
167 void (*set_active) (GstPad *pad, gboolean active);
168 void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
169 void (*caps_nego_failed) (GstPad *pad);
170 void (*connected) (GstPad *pad, GstPad *peer);
171 void (*disconnected) (GstPad *pad, GstPad *peer);
173 void (*eos) (GstPad *pad);
176 struct _GstGhostPad {
182 struct _GstGhostPadClass {
183 GstPadClass parent_class;
187 /***** helper macros *****/
189 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
190 #define GST_PAD_PARENT(pad) ((GstElement *)(GST_OBJECT_PARENT(pad)))
191 #define GST_PAD_ELEMENT_PRIVATE(pad) (((GstPad *)(pad))->element_private)
192 #define GST_PAD_PADTEMPLATE(pad) (((GstPad *)(pad))->padtemplate)
195 #define GST_RPAD_DIRECTION(pad) (((GstRealPad *)(pad))->direction)
196 #define GST_RPAD_CAPS(pad) (((GstRealPad *)(pad))->caps)
197 #define GST_RPAD_PEER(pad) (((GstRealPad *)(pad))->peer)
198 #define GST_RPAD_BUFPEN(pad) (((GstRealPad *)(pad))->bufpen)
199 #define GST_RPAD_SCHED(pad) (((GstRealPad *)(pad))->sched)
200 #define GST_RPAD_CHAINFUNC(pad) (((GstRealPad *)(pad))->chainfunc)
201 #define GST_RPAD_CHAINHANDLER(pad) (((GstRealPad *)(pad))->chainhandler)
202 #define GST_RPAD_GETFUNC(pad) (((GstRealPad *)(pad))->getfunc)
203 #define GST_RPAD_GETHANDLER(pad) (((GstRealPad *)(pad))->gethandler)
204 #define GST_RPAD_EVENTFUNC(pad) (((GstRealPad *)(pad))->eventfunc)
205 #define GST_RPAD_EVENTHANDLER(pad) (((GstRealPad *)(pad))->eventhandler)
207 #define GST_RPAD_GETREGIONFUNC(pad) (((GstRealPad *)(pad))->getregionfunc)
208 #define GST_RPAD_PULLREGIONFUNC(pad) (((GstRealPad *)(pad))->pullregionfunc)
210 #define GST_RPAD_NEGOTIATEFUNC(pad) (((GstRealPad *)(pad))->negotiatefunc)
211 #define GST_RPAD_NEWCAPSFUNC(pad) (((GstRealPad *)(pad))->newcapsfunc)
212 #define GST_RPAD_BUFFERPOOLFUNC(pad) (((GstRealPad *)(pad))->bufferpoolfunc)
214 #define GST_RPAD_REGIONTYPE(pad) (((GstRealPad *)(pad))->regiontype)
215 #define GST_RPAD_OFFSET(pad) (((GstRealPad *)(pad))->offset)
216 #define GST_RPAD_LEN(pad) (((GstRealPad *)(pad))->len)
219 #define GST_GPAD_REALPAD(pad) (((GstGhostPad *)(pad))->realpad)
222 #define GST_PAD_REALIZE(pad) (GST_IS_REAL_PAD(pad) ? ((GstRealPad *)(pad)) : GST_GPAD_REALPAD(pad))
223 #define GST_PAD_DIRECTION(pad) GST_RPAD_DIRECTION(GST_PAD_REALIZE(pad))
224 #define GST_PAD_CAPS(pad) GST_RPAD_CAPS(GST_PAD_REALIZE(pad))
225 #define GST_PAD_PEER(pad) GST_RPAD_PEER(GST_PAD_REALIZE(pad))
227 /* Some check functions (unused?) */
228 #define GST_PAD_CONNECTED(pad) (GST_PAD_PEER(pad) != NULL)
229 #define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->gethandler != NULL)
232 /***** PadTemplate *****/
233 #define GST_TYPE_PADTEMPLATE (gst_padtemplate_get_type ())
234 #define GST_PADTEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PADTEMPLATE,GstPadTemplate))
235 #define GST_PADTEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PADTEMPLATE,GstPadTemplateClass))
236 #define GST_IS_PADTEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PADTEMPLATE))
237 #define GST_IS_PADTEMPLATE_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PADTEMPLATE))
245 #define GST_PADTEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
246 #define GST_PADTEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
247 #define GST_PADTEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
248 #define GST_PADTEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
250 struct _GstPadTemplate {
253 gchar *name_template;
254 GstPadDirection direction;
255 GstPadPresence presence;
259 struct _GstPadTemplateClass {
260 GstObjectClass parent_class;
262 /* signal callbacks */
263 void (*pad_created) (GstPadTemplate *templ, GstPad *pad);
266 #define GST_PADTEMPLATE_NEW(padname, dir, pres, a...) \
267 gst_padtemplate_new ( \
274 #define GST_PADTEMPLATE_FACTORY(name, padname, dir, pres, a...) \
275 static GstPadTemplate* \
278 static GstPadTemplate *templ = NULL; \
280 templ = GST_PADTEMPLATE_NEW ( \
289 #define GST_PADTEMPLATE_GET(fact) (fact)()
291 GType gst_pad_get_type (void);
292 GType gst_real_pad_get_type (void);
293 GType gst_ghost_pad_get_type (void);
295 GstPad* gst_pad_new (gchar *name, GstPadDirection direction);
296 #define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad))
297 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, gchar *name);
299 GstPadDirection gst_pad_get_direction (GstPad *pad);
301 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
302 void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get);
303 void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event);
305 void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion);
307 void gst_pad_set_negotiate_function (GstPad *pad, GstPadNegotiateFunction nego);
308 void gst_pad_set_newcaps_function (GstPad *pad, GstPadNewCapsFunction newcaps);
309 void gst_pad_set_bufferpool_function (GstPad *pad, GstPadBufferPoolFunction bufpool);
311 gboolean gst_pad_set_caps (GstPad *pad, GstCaps *caps);
312 GstCaps* gst_pad_get_caps (GstPad *pad);
313 GstCaps* gst_pad_get_padtemplate_caps (GstPad *pad);
314 gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
316 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
317 gpointer gst_pad_get_element_private (GstPad *pad);
319 void gst_pad_set_name (GstPad *pad, const gchar *name);
320 const gchar* gst_pad_get_name (GstPad *pad);
322 void gst_pad_set_parent (GstPad *pad, GstObject *parent);
323 GstElement* gst_pad_get_parent (GstPad *pad);
324 GstElement* gst_pad_get_real_parent (GstPad *pad);
326 void gst_pad_set_sched (GstPad *pad, GstSchedule *sched);
327 GstSchedule* gst_pad_get_sched (GstPad *pad);
329 void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad);
330 void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad);
331 GList* gst_pad_get_ghost_pad_list (GstPad *pad);
333 GstPadTemplate* gst_pad_get_padtemplate (GstPad *pad);
335 GstPad* gst_pad_get_peer (GstPad *pad);
337 GstBufferPool* gst_pad_get_bufferpool (GstPad *pad);
339 gboolean gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
340 void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
342 gboolean gst_pad_renegotiate (GstPad *pad);
343 GstPadNegotiateReturn gst_pad_negotiate_proxy (GstPad *srcpad, GstPad *destpad, GstCaps **caps);
346 void gst_pad_push (GstPad *pad, GstBuffer *buf);
348 #define gst_pad_push(pad,buf) G_STMT_START{ \
349 if (((GstRealPad *)(pad))->peer->chainhandler) \
350 (((GstRealPad *)(pad))->peer->chainhandler)((GstPad *)(((GstRealPad *)(pad))->peer),(buf)); \
354 GstBuffer* gst_pad_pull (GstPad *pad);
355 GstBuffer* gst_pad_pullregion (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
357 #define gst_pad_pull(pad) \
358 ( (((GstRealPad *)(pad))->peer->gethandler) ? \
359 (((GstRealPad *)(pad))->peer->gethandler)((GstPad *)(((GstRealPad *)(pad))->peer)) : \
361 #define gst_pad_pullregion(pad,type,offset,len) \
362 ( (((GstRealPad *)(pad))->peer->pullregionfunc) ? \
363 (((GstRealPad *)(pad))->peer->pullregionfunc)((GstPad *)(((GstRealPad *)(pad))->peer),(type),(offset),(len)) : \
368 gboolean gst_pad_event (GstPad *pad, void *event);
370 #define gst_pad_event(pad,event) G_STMT_START{ \
371 ( (((GstRealPad *)(pad))->peer->eventhandler) ? \
372 (((GstRealPad *)(pad))->peer->eventhandler)((GstPad *)(((GstRealPad *)(pad))->peer),(event)) : \
378 GstBuffer* gst_pad_peek (GstPad *pad);
379 GstPad* gst_pad_select (GList *padlist);
380 GstPad* gst_pad_selectv (GstPad *pad, ...);
382 void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent);
386 GstPad* gst_ghost_pad_new (gchar *name,GstPad *pad);
389 /* templates and factories */
390 GType gst_padtemplate_get_type (void);
392 GstPadTemplate* gst_padtemplate_new (gchar *name_template,
393 GstPadDirection direction, GstPadPresence presence,
396 GstCaps* gst_padtemplate_get_caps (GstPadTemplate *templ);
397 GstCaps* gst_padtemplate_get_caps_by_name (GstPadTemplate *templ, const gchar *name);
399 xmlNodePtr gst_padtemplate_save_thyself (GstPadTemplate *templ, xmlNodePtr parent);
400 GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
405 #endif /* __cplusplus */
408 #endif /* __GST_PAD_H__ */