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>
44 #endif /* __cplusplus */
47 #define GST_TYPE_PAD (gst_pad_get_type ())
48 #define GST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PAD,GstPad))
49 #define GST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD,GstPadClass))
50 #define GST_IS_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PAD))
51 #define GST_IS_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
53 #define GST_TYPE_REAL_PAD (gst_real_pad_get_type ())
54 #define GST_REAL_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_REAL_PAD,GstRealPad))
55 #define GST_REAL_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD,GstRealPadClass))
56 #define GST_IS_REAL_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_REAL_PAD))
57 #define GST_IS_REAL_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
59 #define GST_TYPE_GHOST_PAD (gst_ghost_pad_get_type ())
60 #define GST_GHOST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_GHOST_PAD,GstGhostPad))
61 #define GST_GHOST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD,GstGhostPadClass))
62 #define GST_IS_GHOST_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_GHOST_PAD))
63 #define GST_IS_GHOST_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
66 typedef struct _GstPad GstPad;
67 typedef struct _GstPadClass GstPadClass;
68 typedef struct _GstRealPad GstRealPad;
69 typedef struct _GstRealPadClass GstRealPadClass;
70 typedef struct _GstGhostPad GstGhostPad;
71 typedef struct _GstGhostPadClass GstGhostPadClass;
72 typedef struct _GstPadTemplate GstPadTemplate;
73 typedef struct _GstPadTemplateClass GstPadTemplateClass;
78 GST_REGION_OFFSET_LEN,
83 GST_PAD_NEGOTIATE_FAIL,
84 GST_PAD_NEGOTIATE_AGREE,
85 GST_PAD_NEGOTIATE_TRY,
86 } GstPadNegotiateReturn;
89 /* this defines the functions used to chain buffers
90 * pad is the sink pad (so the same chain function can be used for N pads)
91 * buf is the buffer being passed */
92 typedef void (*GstPadChainFunction) (GstPad *pad,GstBuffer *buf);
93 typedef GstBuffer *(*GstPadGetFunction) (GstPad *pad);
94 typedef GstBuffer *(*GstPadGetRegionFunction) (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
95 typedef void (*GstPadQoSFunction) (GstPad *pad, glong qos_message);
97 typedef void (*GstPadPushFunction) (GstPad *pad, GstBuffer *buf);
98 typedef GstBuffer *(*GstPadPullFunction) (GstPad *pad);
99 typedef GstBuffer *(*GstPadPullRegionFunction) (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
100 typedef gboolean (*GstPadEOSFunction) (GstPad *pad);
101 typedef GstPadNegotiateReturn (*GstPadNegotiateFunction) (GstPad *pad, GstCaps **caps, gint count);
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;
143 GstPadChainFunction chainfunc;
144 GstPadGetFunction getfunc;
145 GstPadGetRegionFunction getregionfunc;
146 GstPadQoSFunction qosfunc;
147 GstPadEOSFunction eosfunc;
149 GstPadPushFunction pushfunc;
150 GstPadPullFunction pullfunc;
151 GstPadPullRegionFunction pullregionfunc;
153 GstPadNegotiateFunction negotiatefunc;
158 struct _GstRealPadClass {
159 GstPadClass parent_class;
161 /* signal callbacks */
162 void (*set_active) (GstPad *pad, gboolean active);
163 void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
164 void (*eos) (GstPad *pad);
167 struct _GstGhostPad {
173 struct _GstGhostPadClass {
174 GstPadClass parent_class;
178 /***** helper macros *****/
180 #define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
181 #define GST_PAD_PARENT(pad) (GST_OBJECT_PARENT(pad))
182 #define GST_PAD_ELEMENT_PRIVATE(pad) (((GstPad *)(pad))->element_private)
183 #define GST_PAD_PADTEMPLATE(pad) (((GstPad *)(pad))->padtemplate)
186 #define GST_RPAD_DIRECTION(pad) (((GstRealPad *)(pad))->direction)
187 #define GST_RPAD_CAPS(pad) (((GstRealPad *)(pad))->caps)
188 #define GST_RPAD_PEER(pad) (((GstRealPad *)(pad))->peer)
189 #define GST_RPAD_BUFPEN(pad) (((GstRealPad *)(pad))->bufpen)
190 #define GST_RPAD_CHAINFUNC(pad) (((GstRealPad *)(pad))->chainfunc)
191 #define GST_RPAD_GETFUNC(pad) (((GstRealPad *)(pad))->getfunc)
192 #define GST_RPAD_GETREGIONFUNC(pad) (((GstRealPad *)(pad))->getregionfunc)
193 #define GST_RPAD_PUSHFUNC(pad) (((GstRealPad *)(pad))->pushfunc)
194 #define GST_RPAD_PULLFUNC(pad) (((GstRealPad *)(pad))->pullfunc)
195 #define GST_RPAD_PULLREGIONFUNC(pad) (((GstRealPad *)(pad))->pullregionfunc)
196 #define GST_RPAD_QOSFUNC(pad) (((GstRealPad *)(pad))->qosfunc)
197 #define GST_RPAD_EOSFUNC(pad) (((GstRealPad *)(pad))->eosfunc)
198 #define GST_RPAD_NEGOTIATEFUNC(pad) (((GstRealPad *)(pad))->negotiatefunc)
200 #define GST_RPAD_REGIONTYPE(pad) (((GstRealPad *)(pad))->regiontype)
201 #define GST_RPAD_OFFSET(pad) (((GstRealPad *)(pad))->offset)
202 #define GST_RPAD_LEN(pad) (((GstRealPad *)(pad))->len)
205 #define GST_GPAD_REALPAD(pad) (((GstGhostPad *)(pad))->realpad)
208 #define GST_PAD_REALIZE(pad) (GST_IS_REAL_PAD(pad) ? ((GstRealPad *)(pad)) : GST_GPAD_REALPAD(pad))
209 #define GST_PAD_DIRECTION(pad) GST_RPAD_DIRECTION(GST_PAD_REALIZE(pad))
210 #define GST_PAD_CAPS(pad) GST_RPAD_CAPS(GST_PAD_REALIZE(pad))
211 #define GST_PAD_PEER(pad) GST_RPAD_PEER(GST_PAD_REALIZE(pad))
213 /* Some check functions (unused?) */
214 #define GST_PAD_CONNECTED(pad) (GST_PAD_PEER(pad) != NULL)
215 #define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->pullfunc != NULL)
218 /***** PadTemplate *****/
219 #define GST_TYPE_PADTEMPLATE (gst_padtemplate_get_type ())
220 #define GST_PADTEMPLATE(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PADTEMPLATE,GstPad))
221 #define GST_PADTEMPLATE_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PADTEMPLATE,GstPadClass))
222 #define GST_IS_PADTEMPLATE(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PADTEMPLATE))
223 #define GST_IS_PADTEMPLATE_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PADTEMPLATE))
231 #define GST_PADTEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
232 #define GST_PADTEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
233 #define GST_PADTEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
234 #define GST_PADTEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
236 struct _GstPadTemplate {
239 gchar *name_template;
240 GstPadDirection direction;
241 GstPadPresence presence;
245 struct _GstPadTemplateClass {
246 GstObjectClass parent_class;
248 /* signal callbacks */
249 void (*pad_created) (GstPadTemplate *templ, GstPad *pad);
254 typedef gpointer GstPadFactoryEntry;
255 typedef GstPadFactoryEntry GstPadFactory[];
257 #define GST_PAD_FACTORY_ALWAYS GINT_TO_POINTER(GST_PAD_ALWAYS)
258 #define GST_PAD_FACTORY_SOMETIMES GINT_TO_POINTER(GST_PAD_SOMETIMES)
259 #define GST_PAD_FACTORY_REQUEST GINT_TO_POINTER(GST_PAD_REQUEST)
261 #define GST_PAD_FACTORY_SRC GINT_TO_POINTER(GST_PAD_SRC)
262 #define GST_PAD_FACTORY_SINK GINT_TO_POINTER(GST_PAD_SINK)
264 #define GST_PAD_FACTORY_CAPS_ID 1
265 #define GST_PAD_FACTORY_CAPS(a...) GINT_TO_POINTER(GST_PAD_FACTORY_CAPS_ID),##a,NULL
268 GtkType gst_pad_get_type (void);
269 GtkType gst_real_pad_get_type (void);
270 GtkType gst_ghost_pad_get_type (void);
272 GstPad* gst_pad_new (gchar *name, GstPadDirection direction);
273 #define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad))
274 GstPad* gst_pad_new_from_template (GstPadTemplate *templ, gchar *name);
276 GstPadDirection gst_pad_get_direction (GstPad *pad);
278 void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
279 void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get);
280 void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion);
281 void gst_pad_set_qos_function (GstPad *pad, GstPadQoSFunction qos);
282 void gst_pad_set_eos_function (GstPad *pad, GstPadEOSFunction eos);
283 void gst_pad_set_negotiate_function (GstPad *pad, GstPadNegotiateFunction nego);
285 gboolean gst_pad_set_caps (GstPad *pad, GstCaps *caps);
286 GstCaps* gst_pad_get_caps (GstPad *pad);
287 GstCaps* gst_pad_get_padtemplate_caps (GstPad *pad);
288 gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
290 void gst_pad_set_element_private (GstPad *pad, gpointer priv);
291 gpointer gst_pad_get_element_private (GstPad *pad);
293 void gst_pad_set_name (GstPad *pad, const gchar *name);
294 const gchar* gst_pad_get_name (GstPad *pad);
296 void gst_pad_set_parent (GstPad *pad, GstObject *parent);
297 GstObject* gst_pad_get_parent (GstPad *pad);
298 GstObject* gst_pad_get_real_parent (GstPad *pad);
300 void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad);
301 void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad);
302 GList* gst_pad_get_ghost_pad_list (GstPad *pad);
304 GstPadTemplate* gst_pad_get_padtemplate (GstPad *pad);
306 GstPad* gst_pad_get_peer (GstPad *pad);
308 gboolean gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
309 void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
311 gboolean gst_pad_renegotiate (GstPad *pad);
312 GstPadNegotiateReturn gst_pad_negotiate_proxy (GstPad *srcpad, GstPad *destpad, GstCaps **caps, gint counter);
315 void gst_pad_push (GstPad *pad, GstBuffer *buf);
317 #define gst_pad_push(pad,buf) G_STMT_START{ \
318 if ((pad)->peer->pushfunc) ((pad)->peer->pushfunc)((pad)->peer,(buf)); \
322 GstBuffer* gst_pad_pull (GstPad *pad);
323 GstBuffer* gst_pad_pullregion (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
325 #define gst_pad_pull(pad) \
326 (((pad)->peer->pullfunc) ? ((pad)->peer->pullfunc)((pad)->peer) : NULL)
327 #define gst_pad_pullregion(pad,type,offset,len) \
328 (((pad)->peer->pullregionfunc) ? ((pad)->peer->pullregionfunc)((pad)->peer,(type),(offset),(len)) : NULL)
331 #define gst_pad_eos(pad) (GST_RPAD_EOSFUNC(GST_RPAD_PEER(pad))(GST_PAD(GST_RPAD_PEER(pad))))
332 gboolean gst_pad_set_eos (GstPad *pad);
334 void gst_pad_handle_qos (GstPad *pad, glong qos_message);
336 void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent);
340 GstPad * gst_ghost_pad_new (gchar *name,GstPad *pad);
344 /* templates and factories */
345 GtkType gst_padtemplate_get_type (void);
347 GstPadTemplate* gst_padtemplate_new (GstPadFactory *factory);
348 GstPadTemplate* gst_padtemplate_create (gchar *name_template,
349 GstPadDirection direction, GstPadPresence presence,
352 GstCaps* gst_padtemplate_get_caps (GstPadTemplate *templ);
353 GstCaps* gst_padtemplate_get_caps_by_name (GstPadTemplate *templ, const gchar *name);
355 xmlNodePtr gst_padtemplate_save_thyself (GstPadTemplate *templ, xmlNodePtr parent);
356 GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
360 #endif /* __cplusplus */
363 #endif /* __GST_PAD_H__ */