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gstreamer/gst/gstpad.h
Wim Taymans 2d181e4d1d A first attempt at pad negotiation. 
Original commit message from CVS:
A first attempt at pad negotiation.
- _renegotiate can be called by a plugin to negotiate the caps
- _renegotiate is called whenever a pad changes its caps
- the caps cannot contain lists or ranges
- the pad caps are now only set explicitly using gst_pad_set_caps, the
padtemplate caps are not transfered to the pad caps.

missing:
- no notification when negotiation fails
- autoplugging is broken
- the editor doesn't show correct caps
2001-02-19 20:20:19 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@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 <parser.h> // NOTE: This is xml-config's fault
#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))
#define GST_TYPE_REAL_PAD (gst_real_pad_get_type ())
#define GST_REAL_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_REAL_PAD,GstRealPad))
#define GST_REAL_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD,GstRealPadClass))
#define GST_IS_REAL_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_REAL_PAD))
#define GST_IS_REAL_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
#define GST_TYPE_GHOST_PAD (gst_ghost_pad_get_type ())
#define GST_GHOST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_GHOST_PAD,GstGhostPad))
#define GST_GHOST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD,GstGhostPadClass))
#define GST_IS_GHOST_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_GHOST_PAD))
#define GST_IS_GHOST_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
typedef struct _GstPad GstPad;
typedef struct _GstPadClass GstPadClass;
typedef struct _GstRealPad GstRealPad;
typedef struct _GstRealPadClass GstRealPadClass;
typedef struct _GstGhostPad GstGhostPad;
typedef struct _GstGhostPadClass GstGhostPadClass;
typedef struct _GstPadTemplate GstPadTemplate;
typedef struct _GstPadTemplateClass GstPadTemplateClass;
typedef enum {
GST_REGION_NONE,
GST_REGION_OFFSET_LEN,
GST_REGION_TIME_LEN,
} GstRegionType;
/* 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, GstRegionType type, guint64 offset, guint64 len);
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, GstRegionType type, guint64 offset, guint64 len);
typedef gboolean (*GstPadEOSFunction) (GstPad *pad);
typedef GstCaps* (*GstPadNegotiateFunction) (GstPad *pad, GstCaps *caps, gint count);
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;
gpointer element_private;
GstPadTemplate *padtemplate; /* the template for this pad */
};
struct _GstPadClass {
GstObjectClass parent_class;
};
struct _GstRealPad {
GstPad pad;
GstCaps *caps;
GstPadDirection direction;
cothread_state *threadstate;
GstRealPad *peer;
GstBuffer *bufpen;
GstRegionType regiontype;
guint64 offset;
guint64 len;
GstPadChainFunction chainfunc;
GstPadGetFunction getfunc;
GstPadGetRegionFunction getregionfunc;
GstPadQoSFunction qosfunc;
GstPadEOSFunction eosfunc;
GstPadPushFunction pushfunc;
GstPadPullFunction pullfunc;
GstPadPullRegionFunction pullregionfunc;
GstPadNegotiateFunction negotiatefunc;
GList *ghostpads;
};
struct _GstRealPadClass {
GstPadClass parent_class;
/* signal callbacks */
void (*set_active) (GstPad *pad, gboolean active);
void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
void (*eos) (GstPad *pad);
};
struct _GstGhostPad {
GstPad pad;
GstRealPad *realpad;
};
struct _GstGhostPadClass {
GstPadClass parent_class;
};
/***** helper macros *****/
/* GstPad */
#define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
#define GST_PAD_PARENT(pad) (GST_OBJECT_PARENT(pad))
#define GST_PAD_ELEMENT_PRIVATE(pad) (((GstPad *)(pad))->element_private)
#define GST_PAD_PADTEMPLATE(pad) (((GstPad *)(pad))->padtemplate)
/* GstRealPad */
#define GST_RPAD_DIRECTION(pad) (((GstRealPad *)(pad))->direction)
#define GST_RPAD_CAPS(pad) (((GstRealPad *)(pad))->caps)
#define GST_RPAD_PEER(pad) (((GstRealPad *)(pad))->peer)
#define GST_RPAD_BUFPEN(pad) (((GstRealPad *)(pad))->bufpen)
#define GST_RPAD_CHAINFUNC(pad) (((GstRealPad *)(pad))->chainfunc)
#define GST_RPAD_GETFUNC(pad) (((GstRealPad *)(pad))->getfunc)
#define GST_RPAD_GETREGIONFUNC(pad) (((GstRealPad *)(pad))->getregionfunc)
#define GST_RPAD_PUSHFUNC(pad) (((GstRealPad *)(pad))->pushfunc)
#define GST_RPAD_PULLFUNC(pad) (((GstRealPad *)(pad))->pullfunc)
#define GST_RPAD_PULLREGIONFUNC(pad) (((GstRealPad *)(pad))->pullregionfunc)
#define GST_RPAD_QOSFUNC(pad) (((GstRealPad *)(pad))->qosfunc)
#define GST_RPAD_EOSFUNC(pad) (((GstRealPad *)(pad))->eosfunc)
#define GST_RPAD_NEGOTIATEFUNC(pad) (((GstRealPad *)(pad))->negotiatefunc)
#define GST_RPAD_REGIONTYPE(pad) (((GstRealPad *)(pad))->regiontype)
#define GST_RPAD_OFFSET(pad) (((GstRealPad *)(pad))->offset)
#define GST_RPAD_LEN(pad) (((GstRealPad *)(pad))->len)
/* GstGhostPad */
#define GST_GPAD_REALPAD(pad) (((GstGhostPad *)(pad))->realpad)
/* Generic */
#define GST_PAD_REALIZE(pad) (GST_IS_REAL_PAD(pad) ? ((GstRealPad *)(pad)) : GST_GPAD_REALPAD(pad))
#define GST_PAD_DIRECTION(pad) GST_RPAD_DIRECTION(GST_PAD_REALIZE(pad))
#define GST_PAD_CAPS(pad) GST_RPAD_CAPS(GST_PAD_REALIZE(pad))
#define GST_PAD_PEER(pad) GST_RPAD_PEER(GST_PAD_REALIZE(pad))
/* Some check functions (unused?) */
#define GST_PAD_CONNECTED(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->peer != NULL)
#define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->pullfunc != NULL)
/***** PadTemplate *****/
#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,
GST_PAD_REQUEST,
} 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 *templ, 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_REQUEST GINT_TO_POINTER(GST_PAD_REQUEST)
#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);
GtkType gst_real_pad_get_type (void);
GtkType gst_ghost_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 *templ, 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_negotiate_function (GstPad *pad, GstPadNegotiateFunction nego);
void gst_pad_set_caps (GstPad *pad, GstCaps *caps);
GstCaps* gst_pad_get_caps (GstPad *pad);
gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
void gst_pad_set_element_private (GstPad *pad, gpointer priv);
gpointer gst_pad_get_element_private (GstPad *pad);
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_pad (GstPad *pad, GstPad *ghostpad);
void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad);
GList* gst_pad_get_ghost_pad_list (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);
gboolean gst_pad_renegotiate (GstPad *pad);
#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_pullregion (GstPad *pad, GstRegionType type, guint64 offset, guint64 len);
#else
#define gst_pad_pull(pad) \
(((pad)->peer->pullfunc) ? ((pad)->peer->pullfunc)((pad)->peer) : NULL)
#define gst_pad_pullregion(pad,type,offset,len) \
(((pad)->peer->pullregionfunc) ? ((pad)->peer->pullregionfunc)((pad)->peer,(type),(offset),(len)) : NULL)
#endif
GstPad * gst_pad_select (GstPad *nextpad, ...);
#define gst_pad_eos(pad) (GST_RPAD_EOSFUNC(GST_RPAD_PEER(pad))(GST_PAD(GST_RPAD_PEER(pad))))
gboolean gst_pad_set_eos (GstPad *pad);
void gst_pad_handle_qos (GstPad *pad, glong qos_message);
void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent);
/* ghostpads */
GstPad * gst_ghost_pad_new (gchar *name,GstPad *pad);
/* 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 *templ, xmlNodePtr parent);
GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_PAD_H__ */
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