mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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9a0438ba93
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.
240 lines
7.7 KiB
C
240 lines
7.7 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstpad.h: Header for GstPad object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_PAD_H__
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#define __GST_PAD_H__
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#include <gnome-xml/parser.h>
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#include <gst/gstobject.h>
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#include <gst/gstbuffer.h>
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#include <gst/cothreads.h>
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#include <gst/gstcaps.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_PAD (gst_pad_get_type ())
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#define GST_PAD(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PAD,GstPad))
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#define GST_PAD_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD,GstPadClass))
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#define GST_IS_PAD(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PAD))
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#define GST_IS_PAD_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
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/* quick test to see if the pad is connected */
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#define GST_PAD_CONNECTED(pad) ((pad) && (pad)->peer != NULL)
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#define GST_PAD_CAN_PULL(pad) ((pad) && (pad)->pullfunc != NULL)
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typedef struct _GstPad GstPad;
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typedef struct _GstPadClass GstPadClass;
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typedef struct _GstPadTemplate GstPadTemplate;
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typedef struct _GstPadTemplateClass GstPadTemplateClass;
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/* this defines the functions used to chain buffers
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* pad is the sink pad (so the same chain function can be used for N pads)
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* buf is the buffer being passed */
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typedef void (*GstPadChainFunction) (GstPad *pad,GstBuffer *buf);
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typedef GstBuffer *(*GstPadGetFunction) (GstPad *pad);
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typedef GstBuffer *(*GstPadGetRegionFunction) (GstPad *pad, gulong offset, gulong size);
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typedef void (*GstPadQoSFunction) (GstPad *pad, glong qos_message);
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typedef void (*GstPadPushFunction) (GstPad *pad, GstBuffer *buf);
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typedef GstBuffer *(*GstPadPullFunction) (GstPad *pad);
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typedef GstBuffer *(*GstPadPullRegionFunction) (GstPad *pad, gulong offset, gulong size);
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typedef gboolean (*GstPadEOSFunction) (GstPad *pad);
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typedef enum {
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GST_PAD_UNKNOWN,
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GST_PAD_SRC,
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GST_PAD_SINK,
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} GstPadDirection;
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typedef enum {
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GST_PAD_DISABLED = GST_OBJECT_FLAG_LAST,
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GST_PAD_EOS,
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GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4,
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} GstPadFlags;
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struct _GstPad {
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GstObject object;
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gchar *name;
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GList *caps;
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cothread_state *threadstate;
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GstPadDirection direction;
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GstPad *peer;
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GstBuffer *bufpen;
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GstPadChainFunction chainfunc;
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GstPadGetFunction getfunc;
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GstPadGetRegionFunction getregionfunc;
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GstPadQoSFunction qosfunc;
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GstPadPushFunction pushfunc;
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GstPadPullFunction pullfunc;
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GstPadPullRegionFunction pullregionfunc;
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GstPadEOSFunction eosfunc;
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GstObject *parent;
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GList *ghostparents;
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GstPadTemplate *padtemplate; /* the template for this pad */
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};
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struct _GstPadClass {
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GstObjectClass parent_class;
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/* signal callbacks */
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void (*set_active) (GstPad *pad, gboolean active);
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void (*caps_changed) (GstPad *pad, GstCaps *newcaps);
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void (*eos) (GstPad *pad);
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};
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/* template */
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#define GST_TYPE_PADTEMPLATE (gst_padtemplate_get_type ())
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#define GST_PADTEMPLATE(obj) (GTK_CHECK_CAST ((obj), GST_TYPE_PADTEMPLATE,GstPad))
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#define GST_PADTEMPLATE_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GST_TYPE_PADTEMPLATE,GstPadClass))
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#define GST_IS_PADTEMPLATE(obj) (GTK_CHECK_TYPE ((obj), GST_TYPE_PADTEMPLATE))
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#define GST_IS_PADTEMPLATE_CLASS(obj) (GTK_CHECK_CLASS_TYPE ((klass), GST_TYPE_PADTEMPLATE))
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typedef enum {
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GST_PAD_ALWAYS,
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GST_PAD_SOMETIMES,
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} GstPadPresence;
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struct _GstPadTemplate {
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GstObject object;
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gchar *name_template;
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GstPadDirection direction;
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GstPadPresence presence;
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GList *caps;
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};
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struct _GstPadTemplateClass {
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GstObjectClass parent_class;
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/* signal callbacks */
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void (*pad_created) (GstPadTemplate *temp, GstPad *pad);
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};
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/* factory */
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typedef gpointer GstPadFactoryEntry;
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typedef GstPadFactoryEntry GstPadFactory[];
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#define GST_PAD_FACTORY_ALWAYS GINT_TO_POINTER(GST_PAD_ALWAYS)
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#define GST_PAD_FACTORY_SOMETIMES GINT_TO_POINTER(GST_PAD_SOMETIMES)
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#define GST_PAD_FACTORY_SRC GINT_TO_POINTER(GST_PAD_SRC)
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#define GST_PAD_FACTORY_SINK GINT_TO_POINTER(GST_PAD_SINK)
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#define GST_PAD_FACTORY_CAPS(a...) GINT_TO_POINTER(1),##a,NULL
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GtkType gst_pad_get_type (void);
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GstPad* gst_pad_new (gchar *name, GstPadDirection direction);
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#define gst_pad_destroy(pad) gst_object_destroy (GST_OBJECT (pad))
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GstPad* gst_pad_new_from_template (GstPadTemplate *temp, gchar *name);
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GstPadDirection gst_pad_get_direction (GstPad *pad);
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void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain);
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void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get);
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void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion);
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void gst_pad_set_qos_function (GstPad *pad, GstPadQoSFunction qos);
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void gst_pad_set_eos_function (GstPad *pad, GstPadEOSFunction eos);
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void gst_pad_set_caps_list (GstPad *pad, GList *caps);
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GList* gst_pad_get_caps_list (GstPad *pad);
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GstCaps* gst_pad_get_caps_by_name (GstPad *pad, gchar *name);
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gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
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void gst_pad_set_name (GstPad *pad, const gchar *name);
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const gchar* gst_pad_get_name (GstPad *pad);
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void gst_pad_set_parent (GstPad *pad, GstObject *parent);
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GstObject* gst_pad_get_parent (GstPad *pad);
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void gst_pad_add_ghost_parent (GstPad *pad, GstObject *parent);
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void gst_pad_remove_ghost_parent (GstPad *pad, GstObject *parent);
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GList* gst_pad_get_ghost_parents (GstPad *pad);
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GstPad* gst_pad_get_peer (GstPad *pad);
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void gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
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void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
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#if 1
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void gst_pad_push (GstPad *pad, GstBuffer *buffer);
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#else
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#define gst_pad_push(pad,buf) G_STMT_START{ \
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if ((pad)->peer->pushfunc) ((pad)->peer->pushfunc)((pad)->peer,(buf)); \
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}G_STMT_END
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#endif
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#if 1
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GstBuffer* gst_pad_pull (GstPad *pad);
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GstBuffer* gst_pad_pull_region (GstPad *pad, gulong offset, gulong size);
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#else
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#define gst_pad_pull(pad) \
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(((pad)->peer->pullfunc) ? ((pad)->peer->pullfunc)((pad)->peer) : NULL)
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#define gst_pad_pullregion(pad,offset,size) \
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(((pad)->peer->pullregionfunc) ? ((pad)->peer->pullregionfunc)((pad)->peer,(offset),(size)) : NULL)
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#endif
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#define gst_pad_eos(pad) ((pad)->peer->eosfunc((pad)->peer))
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gboolean gst_pad_set_eos (GstPad *pad);
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void gst_pad_handle_qos (GstPad *pad, glong qos_message);
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xmlNodePtr gst_pad_save_thyself (GstPad *pad, xmlNodePtr parent);
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void gst_pad_load_and_connect (xmlNodePtr parent, GstObject *element, GHashTable *elements);
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/* templates and factories */
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GtkType gst_padtemplate_get_type (void);
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GstPadTemplate* gst_padtemplate_new (GstPadFactory *factory);
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GstPadTemplate* gst_padtemplate_create (gchar *name_template,
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GstPadDirection direction, GstPadPresence presence,
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GList *caps);
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xmlNodePtr gst_padtemplate_save_thyself (GstPadTemplate *pad, xmlNodePtr parent);
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GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_PAD_H__ */
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