/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * 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 #include #include #include #include #include G_BEGIN_DECLS extern GType _gst_pad_type; extern GType _gst_real_pad_type; extern GType _gst_ghost_pad_type; #define GST_TYPE_PARANOID /* * Pad base class */ #define GST_TYPE_PAD (_gst_pad_type) #define GST_PAD_CAST(obj) ((GstPad*)(obj)) #define GST_PAD_CLASS_CAST(klass) ((GstPadClass*)(klass)) #define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD)) #define GST_IS_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD || \ G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD) #define GST_IS_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD)) #ifdef GST_TYPE_PARANOID # define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad)) # define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass)) #else # define GST_PAD GST_PAD_CAST # define GST_PAD_CLASS GST_PAD_CLASS_CAST #endif /* * Real Pads */ #define GST_TYPE_REAL_PAD (_gst_real_pad_type) #define GST_REAL_PAD_CAST(obj) ((GstRealPad*)(obj)) #define GST_REAL_PAD_CLASS_CAST(klass) ((GstRealPadClass*)(klass)) #define GST_IS_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_REAL_PAD)) #define GST_IS_REAL_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD) #define GST_IS_REAL_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD)) #ifdef GST_TYPE_PARANOID # define GST_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_REAL_PAD, GstRealPad)) # define GST_REAL_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD, GstRealPadClass)) #else # define GST_REAL_PAD GST_REAL_PAD_CAST # define GST_REAL_PAD_CLASS GST_REAL_PAD_CLASS_CAST #endif /* * Ghost Pads */ #define GST_TYPE_GHOST_PAD (_gst_ghost_pad_type) #define GST_GHOST_PAD_CAST(obj) ((GstGhostPad*)(obj)) #define GST_GHOST_PAD_CLASS_CAST(klass) ((GstGhostPadClass*)(klass)) #define GST_IS_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GHOST_PAD)) #define GST_IS_GHOST_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD) #define GST_IS_GHOST_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD)) #ifdef GST_TYPE_PARANOID # define GST_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_GHOST_PAD, GstGhostPad)) # define GST_GHOST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD, GstGhostPadClass)) #else # define GST_GHOST_PAD GST_GHOST_PAD_CAST # define GST_GHOST_PAD_CLASS GST_GHOST_PAD_CLASS_CAST #endif /*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_PAD_CONNECT_REFUSED = -1, GST_PAD_CONNECT_DELAYED = 0, GST_PAD_CONNECT_OK = 1, GST_PAD_CONNECT_DONE = 2 } GstPadConnectReturn; typedef enum { GST_PAD_QUERY_NONE = 0, GST_PAD_QUERY_TOTAL, GST_PAD_QUERY_POSITION, GST_PAD_QUERY_LATENCY, GST_PAD_QUERY_JITTER, GST_PAD_QUERY_START, GST_PAD_QUERY_SEGMENT_END, GST_PAD_QUERY_RATE } GstPadQueryType; #ifdef G_HAVE_ISO_VARARGS #define GST_PAD_QUERY_TYPE_FUNCTION(functionname, ...) \ static const GstPadQueryType* \ functionname (GstPad *pad) \ { \ static const GstPadQueryType types[] = { \ __VA_ARGS__, \ 0 \ }; \ return types; \ } #elif defined(G_HAVE_GNUC_VARARGS) #define GST_PAD_QUERY_TYPE_FUNCTION(functionname, a...) \ static const GstPadQueryType* \ functionname (GstPad *pad) \ { \ static const GstPadQueryType types[] = { \ a, \ 0 \ }; \ return types; \ } #endif /* 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 gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event); typedef gboolean (*GstPadConvertFunction) (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value); typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstPadQueryType type, GstFormat *format, gint64 *value); typedef GList* (*GstPadIntConnFunction) (GstPad *pad); typedef const GstFormat* (*GstPadFormatsFunction) (GstPad *pad); typedef const GstEventMask* (*GstPadEventMaskFunction) (GstPad *pad); typedef const GstPadQueryType* (*GstPadQueryTypeFunction) (GstPad *pad); typedef GstPadConnectReturn (*GstPadConnectFunction) (GstPad *pad, GstCaps *caps); typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad, GstCaps *caps); typedef GstBufferPool* (*GstPadBufferPoolFunction) (GstPad *pad); typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data); 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; /* the pad capabilities */ GstCaps *caps; GstCaps *filter; GstCaps *appfilter; GstPadGetCapsFunction getcapsfunc; GstPadDirection direction; GstPadConnectFunction connectfunc; GstRealPad *peer; gpointer sched_private; /* data transport functions */ GstPadChainFunction chainfunc; GstPadChainFunction chainhandler; GstPadGetFunction getfunc; GstPadGetFunction gethandler; GstPadEventFunction eventfunc; GstPadEventFunction eventhandler; GstPadEventMaskFunction eventmaskfunc; GList *ghostpads; /* query/convert/formats functions */ GstPadConvertFunction convertfunc; GstPadQueryFunction queryfunc; GstPadFormatsFunction formatsfunc; GstPadQueryTypeFunction querytypefunc; GstPadIntConnFunction intconnfunc; GstPadBufferPoolFunction bufferpoolfunc; GstProbeDispatcher probedisp; }; struct _GstRealPadClass { GstPadClass parent_class; /* signal callbacks */ void (*caps_nego_failed) (GstPad *pad); void (*connected) (GstPad *pad, GstPad *peer); void (*disconnected) (GstPad *pad, GstPad *peer); }; 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) ((GstElement *)(GST_OBJECT_PARENT(pad))) #define GST_PAD_ELEMENT_PRIVATE(pad) (((GstPad *)(pad))->element_private) #define GST_PAD_PAD_TEMPLATE(pad) (((GstPad *)(pad))->padtemplate) /* GstRealPad */ #define GST_RPAD_DIRECTION(pad) (((GstRealPad *)(pad))->direction) #define GST_RPAD_CAPS(pad) (((GstRealPad *)(pad))->caps) #define GST_RPAD_FILTER(pad) (((GstRealPad *)(pad))->filter) #define GST_RPAD_APPFILTER(pad) (((GstRealPad *)(pad))->appfilter) #define GST_RPAD_PEER(pad) (((GstRealPad *)(pad))->peer) #define GST_RPAD_CHAINFUNC(pad) (((GstRealPad *)(pad))->chainfunc) #define GST_RPAD_CHAINHANDLER(pad) (((GstRealPad *)(pad))->chainhandler) #define GST_RPAD_GETFUNC(pad) (((GstRealPad *)(pad))->getfunc) #define GST_RPAD_GETHANDLER(pad) (((GstRealPad *)(pad))->gethandler) #define GST_RPAD_EVENTFUNC(pad) (((GstRealPad *)(pad))->eventfunc) #define GST_RPAD_EVENTHANDLER(pad) (((GstRealPad *)(pad))->eventhandler) #define GST_RPAD_CONVERTFUNC(pad) (((GstRealPad *)(pad))->convertfunc) #define GST_RPAD_QUERYFUNC(pad) (((GstRealPad *)(pad))->queryfunc) #define GST_RPAD_INTCONNFUNC(pad) (((GstRealPad *)(pad))->intconnfunc) #define GST_RPAD_FORMATSFUNC(pad) (((GstRealPad *)(pad))->formatsfunc) #define GST_RPAD_QUERYTYPEFUNC(pad) (((GstRealPad *)(pad))->querytypefunc) #define GST_RPAD_EVENTMASKFUNC(pad) (((GstRealPad *)(pad))->eventmaskfunc) #define GST_RPAD_CONNECTFUNC(pad) (((GstRealPad *)(pad))->connectfunc) #define GST_RPAD_GETCAPSFUNC(pad) (((GstRealPad *)(pad))->getcapsfunc) #define GST_RPAD_BUFFERPOOLFUNC(pad) (((GstRealPad *)(pad))->bufferpoolfunc) /* 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_PAD_CAST(GST_RPAD_PEER(GST_PAD_REALIZE(pad))) /* Some check functions (unused?) */ #define GST_PAD_IS_CONNECTED(pad) (GST_PAD_PEER(pad) != NULL) #define GST_PAD_IS_ACTIVE(pad) (!GST_FLAG_IS_SET(pad, GST_PAD_DISABLED)) #define GST_PAD_IS_USABLE(pad) (GST_PAD_IS_CONNECTED (pad) && \ GST_PAD_IS_ACTIVE(pad) && GST_PAD_IS_ACTIVE(GST_PAD_PEER (pad))) #define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->gethandler != NULL) #define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC) #define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK) /***** PadTemplate *****/ #define GST_TYPE_PAD_TEMPLATE (gst_pad_template_get_type ()) #define GST_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD_TEMPLATE,GstPadTemplate)) #define GST_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD_TEMPLATE,GstPadTemplateClass)) #define GST_IS_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD_TEMPLATE)) #define GST_IS_PAD_TEMPLATE_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD_TEMPLATE)) typedef enum { GST_PAD_ALWAYS, GST_PAD_SOMETIMES, GST_PAD_REQUEST } GstPadPresence; #define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template) #define GST_PAD_TEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction) #define GST_PAD_TEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence) #define GST_PAD_TEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps) #define GST_PAD_TEMPLATE_FIXED(templ) (((GstPadTemplate *)(templ))->fixed) #define GST_PAD_TEMPLATE_IS_FIXED(templ) (GST_PAD_TEMPLATE_FIXED(templ) == TRUE) struct _GstPadTemplate { GstObject object; gchar *name_template; GstPadDirection direction; GstPadPresence presence; GstCaps *caps; gboolean fixed; }; struct _GstPadTemplateClass { GstObjectClass parent_class; /* signal callbacks */ void (*pad_created) (GstPadTemplate *templ, GstPad *pad); }; #ifdef G_HAVE_ISO_VARARGS #define GST_PAD_TEMPLATE_NEW(padname, dir, pres, ...) \ gst_pad_template_new ( \ padname, \ dir, \ pres, \ __VA_ARGS__ , \ NULL) #define GST_PAD_TEMPLATE_FACTORY(name, padname, dir, pres, ...) \ static GstPadTemplate* \ name (void) \ { \ static GstPadTemplate *templ = NULL; \ if (!templ) { \ templ = GST_PAD_TEMPLATE_NEW ( \ padname, \ dir, \ pres, \ __VA_ARGS__ ); \ } \ return templ; \ } #elif defined(G_HAVE_GNUC_VARARGS) /* CR1: the space after 'a' is necessary because of preprocessing in gcc */ #define GST_PAD_TEMPLATE_NEW(padname, dir, pres, a...) \ gst_pad_template_new ( \ padname, \ dir, \ pres, \ a , \ NULL) #define GST_PAD_TEMPLATE_FACTORY(name, padname, dir, pres, a...) \ static GstPadTemplate* \ name (void) \ { \ static GstPadTemplate *templ = NULL; \ if (!templ) { \ templ = GST_PAD_TEMPLATE_NEW ( \ padname, \ dir, \ pres, \ a ); \ } \ return templ; \ } #endif #define GST_PAD_TEMPLATE_GET(fact) (fact)() GType gst_pad_get_type (void); GType gst_real_pad_get_type (void); GType gst_ghost_pad_get_type (void); /* creating pads */ GstPad* gst_pad_new (const gchar *name, GstPadDirection direction); #define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad)) GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name); GstPad* gst_pad_custom_new (GType type, const gchar *name, GstPadDirection direction); GstPad* gst_pad_custom_new_from_template (GType type, GstPadTemplate *templ, const gchar *name); void gst_pad_set_name (GstPad *pad, const gchar *name); const gchar* gst_pad_get_name (GstPad *pad); GstPadDirection gst_pad_get_direction (GstPad *pad); void gst_pad_set_active (GstPad *pad, gboolean active); gboolean gst_pad_is_active (GstPad *pad); void gst_pad_set_element_private (GstPad *pad, gpointer priv); gpointer gst_pad_get_element_private (GstPad *pad); void gst_pad_set_parent (GstPad *pad, GstElement *parent); GstElement* gst_pad_get_parent (GstPad *pad); GstElement* gst_pad_get_real_parent (GstPad *pad); GstScheduler* gst_pad_get_scheduler (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); GstPadTemplate* gst_pad_get_pad_template (GstPad *pad); void gst_pad_set_bufferpool_function (GstPad *pad, GstPadBufferPoolFunction bufpool); GstBufferPool* gst_pad_get_bufferpool (GstPad *pad); /* data passing setup functions */ void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain); void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get); void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event); void gst_pad_set_event_mask_function (GstPad *pad, GstPadEventMaskFunction mask_func); const GstEventMask* gst_pad_get_event_masks (GstPad *pad); const GstEventMask* gst_pad_get_event_masks_default (GstPad *pad); gboolean gst_pad_handles_event (GstPad *pad, GstEventMask *mask); /* pad connections */ void gst_pad_set_connect_function (GstPad *pad, GstPadConnectFunction connect); gboolean gst_pad_can_connect (GstPad *srcpad, GstPad *sinkpad); gboolean gst_pad_can_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps); gboolean gst_pad_connect (GstPad *srcpad, GstPad *sinkpad); gboolean gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps); void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad); GstPad* gst_pad_get_peer (GstPad *pad); /* capsnego functions */ GstCaps* gst_pad_get_caps (GstPad *pad); GstCaps* gst_pad_get_pad_template_caps (GstPad *pad); GstPadConnectReturn gst_pad_try_set_caps (GstPad *pad, GstCaps *caps); gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad); void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps); GstPadConnectReturn gst_pad_proxy_connect (GstPad *pad, GstCaps *caps); gboolean gst_pad_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps); gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad); gboolean gst_pad_try_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps); GstCaps* gst_pad_get_allowed_caps (GstPad *pad); gboolean gst_pad_recalc_allowed_caps (GstPad *pad); /* data passing functions */ void gst_pad_push (GstPad *pad, GstBuffer *buf); GstBuffer* gst_pad_pull (GstPad *pad); gboolean gst_pad_send_event (GstPad *pad, GstEvent *event); gboolean gst_pad_event_default (GstPad *pad, GstEvent *event); GstPad* gst_pad_select (GList *padlist); GstPad* gst_pad_selectv (GstPad *pad, ...); /* convert/query/format functions */ void gst_pad_set_formats_function (GstPad *pad, GstPadFormatsFunction formats); gboolean gst_pad_handles_format (GstPad *pad, GstFormat format); const GstFormat* gst_pad_get_formats (GstPad *pad); const GstFormat* gst_pad_get_formats_default (GstPad *pad); void gst_pad_set_convert_function (GstPad *pad, GstPadConvertFunction convert); gboolean gst_pad_convert (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value); gboolean gst_pad_convert_default (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value); void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query); void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func); const GstPadQueryType* gst_pad_get_query_types (GstPad *pad); const GstPadQueryType* gst_pad_get_query_types_default (GstPad *pad); gboolean gst_pad_query (GstPad *pad, GstPadQueryType type, GstFormat *format, gint64 *value); gboolean gst_pad_query_default (GstPad *pad, GstPadQueryType type, GstFormat *format, gint64 *value); void gst_pad_set_internal_connection_function(GstPad *pad, GstPadIntConnFunction intconn); GList* gst_pad_get_internal_connections (GstPad *pad); GList* gst_pad_get_internal_connections_default (GstPad *pad); /* misc helper functions */ gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch, gpointer data); #define gst_pad_add_probe(pad, probe) \ (gst_probe_dispatcher_add_probe (&(GST_REAL_PAD (pad)-probedisp), probe)) #define gst_pad_remove_probe(pad, probe) \ (gst_probe_dispatcher_remove_probe (&(GST_REAL_PAD (pad)-probedisp), probe)) #ifndef GST_DISABLE_LOADSAVE void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent); #endif /* ghostpads */ GstPad* gst_ghost_pad_new (const gchar *name, GstPad *pad); /* templates and factories */ GType gst_pad_template_get_type (void); GstPadTemplate* gst_pad_template_new (const gchar *name_template, GstPadDirection direction, GstPadPresence presence, GstCaps *caps, ...); GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ); GstCaps* gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name); xmlNodePtr gst_ghost_pad_save_thyself (GstPad *pad, xmlNodePtr parent); G_END_DECLS #endif /* __GST_PAD_H__ */