mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b2ee38575d
Original commit message from CVS: Landed the new improved capsnegotiation system. The main idea is to keep track of the possible data types that can pass through a connection. plugins can at any time inspect, adjust and refine these caps. plugins also get notified when something changes to the types so that they can reconfigure themselves. Look at the updated plugins and the soon to be finished doc.
464 lines
16 KiB
C
464 lines
16 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@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 <gst/gstconfig.h>
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#include <gst/gstobject.h>
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#include <gst/gstbuffer.h>
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#include <gst/gstcaps.h>
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#include <gst/gstevent.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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extern GType _gst_pad_type;
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extern GType _gst_real_pad_type;
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extern GType _gst_ghost_pad_type;
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/*#define GST_TYPE_PARANOID */
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/*
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* Pad base class
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*/
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#define GST_TYPE_PAD (_gst_pad_type)
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#define GST_PAD_CAST(obj) ((GstPad*)(obj))
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#define GST_PAD_CLASS_CAST(klass) ((GstPadClass*)(klass))
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#define GST_IS_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD))
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#define GST_IS_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD || \
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G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD)
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#define GST_IS_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD))
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#ifdef GST_TYPE_PARANOID
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# define GST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD, GstPad))
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# define GST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD, GstPadClass))
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#else
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# define GST_PAD GST_PAD_CAST
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# define GST_PAD_CLASS GST_PAD_CLASS_CAST
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#endif
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/*
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* Real Pads
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*/
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#define GST_TYPE_REAL_PAD (_gst_real_pad_type)
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#define GST_REAL_PAD_CAST(obj) ((GstRealPad*)(obj))
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#define GST_REAL_PAD_CLASS_CAST(klass) ((GstRealPadClass*)(klass))
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#define GST_IS_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_REAL_PAD))
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#define GST_IS_REAL_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_REAL_PAD)
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#define GST_IS_REAL_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_REAL_PAD))
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#ifdef GST_TYPE_PARANOID
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# define GST_REAL_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_REAL_PAD, GstRealPad))
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# define GST_REAL_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_REAL_PAD, GstRealPadClass))
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#else
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# define GST_REAL_PAD GST_REAL_PAD_CAST
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# define GST_REAL_PAD_CLASS GST_REAL_PAD_CLASS_CAST
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#endif
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/*
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* Ghost Pads
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*/
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#define GST_TYPE_GHOST_PAD (_gst_ghost_pad_type)
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#define GST_GHOST_PAD_CAST(obj) ((GstGhostPad*)(obj))
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#define GST_GHOST_PAD_CLASS_CAST(klass) ((GstGhostPadClass*)(klass))
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#define GST_IS_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_GHOST_PAD))
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#define GST_IS_GHOST_PAD_FAST(obj) (G_OBJECT_TYPE(obj) == GST_TYPE_GHOST_PAD)
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#define GST_IS_GHOST_PAD_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_GHOST_PAD))
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#ifdef GST_TYPE_PARANOID
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# define GST_GHOST_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_GHOST_PAD, GstGhostPad))
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# define GST_GHOST_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_GHOST_PAD, GstGhostPadClass))
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#else
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# define GST_GHOST_PAD GST_GHOST_PAD_CAST
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# define GST_GHOST_PAD_CLASS GST_GHOST_PAD_CLASS_CAST
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#endif
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/*typedef struct _GstPad GstPad; */
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/*typedef struct _GstPadClass GstPadClass;*/
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typedef struct _GstRealPad GstRealPad;
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typedef struct _GstRealPadClass GstRealPadClass;
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typedef struct _GstGhostPad GstGhostPad;
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typedef struct _GstGhostPadClass GstGhostPadClass;
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/*typedef struct _GstPadTemplate GstPadTemplate;*/
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/*typedef struct _GstPadTemplateClass GstPadTemplateClass;*/
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typedef enum {
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GST_REGION_VOID,
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GST_REGION_OFFSET_LEN,
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GST_REGION_TIME_LEN,
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} GstRegionType;
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typedef enum {
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GST_PAD_CONNECT_REFUSED = 0,
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GST_PAD_CONNECT_OK = 1,
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GST_PAD_CONNECT_DONE = 2,
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GST_PAD_CONNECT_DELAYED = 3,
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} GstPadConnectReturn;
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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 gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
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typedef GstBuffer* (*GstPadGetRegionFunction) (GstPad *pad, GstRegionType type,
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guint64 offset, guint64 len);
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typedef GstBuffer* (*GstPadPullRegionFunction) (GstPad *pad, GstRegionType type,
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guint64 offset, guint64 len);
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typedef GstPadConnectReturn (*GstPadConnectFunction) (GstPad *pad, GstCaps *caps);
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typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad, GstCaps *caps);
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typedef GstBufferPool* (*GstPadBufferPoolFunction) (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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gpointer element_private;
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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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};
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struct _GstRealPad {
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GstPad pad;
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GstCaps *caps;
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GstCaps *filter;
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GstCaps *appfilter;
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GstPadDirection direction;
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GstScheduler *sched;
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gpointer sched_private;
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GstRealPad *peer;
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GstBuffer *bufpen;
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GstRegionType regiontype;
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guint64 offset;
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guint64 len;
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GstPadChainFunction chainfunc;
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GstPadChainFunction chainhandler;
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GstPadGetFunction getfunc;
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GstPadGetFunction gethandler;
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GstPadEventFunction eventfunc;
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GstPadEventFunction eventhandler;
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GstPadGetRegionFunction getregionfunc;
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GstPadPullRegionFunction pullregionfunc;
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GstPadGetCapsFunction getcapsfunc;
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GstPadConnectFunction connectfunc;
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GstPadBufferPoolFunction bufferpoolfunc;
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GList *ghostpads;
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};
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struct _GstRealPadClass {
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GstPadClass 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 (*caps_nego_failed) (GstPad *pad);
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void (*connected) (GstPad *pad, GstPad *peer);
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void (*disconnected) (GstPad *pad, GstPad *peer);
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void (*event_received) (GstPad *pad, GstEvent *event);
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void (*eos) (GstPad *pad);
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};
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struct _GstGhostPad {
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GstPad pad;
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GstRealPad *realpad;
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};
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struct _GstGhostPadClass {
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GstPadClass parent_class;
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};
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/***** helper macros *****/
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/* GstPad */
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#define GST_PAD_NAME(pad) (GST_OBJECT_NAME(pad))
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#define GST_PAD_PARENT(pad) ((GstElement *)(GST_OBJECT_PARENT(pad)))
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#define GST_PAD_ELEMENT_PRIVATE(pad) (((GstPad *)(pad))->element_private)
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#define GST_PAD_PADTEMPLATE(pad) (((GstPad *)(pad))->padtemplate)
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/* GstRealPad */
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#define GST_RPAD_DIRECTION(pad) (((GstRealPad *)(pad))->direction)
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#define GST_RPAD_CAPS(pad) (((GstRealPad *)(pad))->caps)
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#define GST_RPAD_FILTER(pad) (((GstRealPad *)(pad))->filter)
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#define GST_RPAD_APPFILTER(pad) (((GstRealPad *)(pad))->appfilter)
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#define GST_RPAD_PEER(pad) (((GstRealPad *)(pad))->peer)
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#define GST_RPAD_BUFPEN(pad) (((GstRealPad *)(pad))->bufpen)
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#define GST_RPAD_SCHED(pad) (((GstRealPad *)(pad))->sched)
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#define GST_RPAD_CHAINFUNC(pad) (((GstRealPad *)(pad))->chainfunc)
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#define GST_RPAD_CHAINHANDLER(pad) (((GstRealPad *)(pad))->chainhandler)
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#define GST_RPAD_GETFUNC(pad) (((GstRealPad *)(pad))->getfunc)
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#define GST_RPAD_GETHANDLER(pad) (((GstRealPad *)(pad))->gethandler)
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#define GST_RPAD_EVENTFUNC(pad) (((GstRealPad *)(pad))->eventfunc)
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#define GST_RPAD_EVENTHANDLER(pad) (((GstRealPad *)(pad))->eventhandler)
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#define GST_RPAD_GETREGIONFUNC(pad) (((GstRealPad *)(pad))->getregionfunc)
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#define GST_RPAD_PULLREGIONFUNC(pad) (((GstRealPad *)(pad))->pullregionfunc)
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#define GST_RPAD_CONNECTFUNC(pad) (((GstRealPad *)(pad))->connectfunc)
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#define GST_RPAD_GETCAPSFUNC(pad) (((GstRealPad *)(pad))->getcapsfunc)
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#define GST_RPAD_BUFFERPOOLFUNC(pad) (((GstRealPad *)(pad))->bufferpoolfunc)
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#define GST_RPAD_REGIONTYPE(pad) (((GstRealPad *)(pad))->regiontype)
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#define GST_RPAD_OFFSET(pad) (((GstRealPad *)(pad))->offset)
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#define GST_RPAD_LEN(pad) (((GstRealPad *)(pad))->len)
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/* GstGhostPad */
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#define GST_GPAD_REALPAD(pad) (((GstGhostPad *)(pad))->realpad)
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/* Generic */
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#define GST_PAD_REALIZE(pad) (GST_IS_REAL_PAD(pad) ? ((GstRealPad *)(pad)) : GST_GPAD_REALPAD(pad))
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#define GST_PAD_DIRECTION(pad) GST_RPAD_DIRECTION(GST_PAD_REALIZE(pad))
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#define GST_PAD_CAPS(pad) GST_RPAD_CAPS(GST_PAD_REALIZE(pad))
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#define GST_PAD_PEER(pad) GST_RPAD_PEER(GST_PAD_REALIZE(pad))
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/* Some check functions (unused?) */
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#define GST_PAD_IS_CONNECTED(pad) (GST_PAD_PEER(pad) != NULL)
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#define GST_PAD_CAN_PULL(pad) (GST_IS_REAL_PAD(pad) && GST_REAL_PAD(pad)->gethandler != NULL)
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#define GST_PAD_IS_SRC(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SRC)
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#define GST_PAD_IS_SINK(pad) (GST_PAD_DIRECTION(pad) == GST_PAD_SINK)
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/***** PadTemplate *****/
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#define GST_TYPE_PADTEMPLATE (gst_padtemplate_get_type ())
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#define GST_PADTEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PADTEMPLATE,GstPadTemplate))
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#define GST_PADTEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PADTEMPLATE,GstPadTemplateClass))
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#define GST_IS_PADTEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PADTEMPLATE))
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#define GST_IS_PADTEMPLATE_CLASS(obj) (G_TYPE_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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GST_PAD_REQUEST,
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} GstPadPresence;
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#define GST_PADTEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
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#define GST_PADTEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
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#define GST_PADTEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
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#define GST_PADTEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
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#define GST_PADTEMPLATE_FIXED(templ) (((GstPadTemplate *)(templ))->fixed)
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#define GST_PADTEMPLATE_IS_FIXED(templ) (GST_PADTEMPLATE_FIXED(templ) == TRUE)
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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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GstCaps *caps;
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gboolean fixed;
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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 *templ, GstPad *pad);
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};
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#define GST_PADTEMPLATE_NEW(padname, dir, pres, a...) \
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gst_padtemplate_new ( \
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padname, \
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dir, \
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pres, \
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a , \
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NULL)
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#define GST_PADTEMPLATE_FACTORY(name, padname, dir, pres, a...) \
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static GstPadTemplate* \
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name (void) \
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{ \
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static GstPadTemplate *templ = NULL; \
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if (!templ) { \
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templ = GST_PADTEMPLATE_NEW ( \
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padname, \
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dir, \
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pres, \
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a ); \
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} \
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return templ; \
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}
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#define GST_PADTEMPLATE_GET(fact) (fact)()
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GType gst_pad_get_type (void);
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GType gst_real_pad_get_type (void);
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GType gst_ghost_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 *templ, 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_event_function (GstPad *pad, GstPadEventFunction event);
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void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion);
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void gst_pad_set_connect_function (GstPad *pad, GstPadConnectFunction connect);
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void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps);
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void gst_pad_set_bufferpool_function (GstPad *pad, GstPadBufferPoolFunction bufpool);
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GstCaps* gst_pad_get_caps (GstPad *pad);
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GstCaps* gst_pad_get_padtemplate_caps (GstPad *pad);
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gboolean gst_pad_try_set_caps (GstPad *pad, GstCaps *caps);
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gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad);
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void gst_pad_set_element_private (GstPad *pad, gpointer priv);
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gpointer gst_pad_get_element_private (GstPad *pad);
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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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GstElement* gst_pad_get_parent (GstPad *pad);
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GstElement* gst_pad_get_real_parent (GstPad *pad);
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void gst_pad_set_sched (GstPad *pad, GstScheduler *sched);
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GstScheduler* gst_pad_get_sched (GstPad *pad);
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void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad);
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void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad);
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GList* gst_pad_get_ghost_pad_list (GstPad *pad);
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GstPadTemplate* gst_pad_get_padtemplate (GstPad *pad);
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GstPad* gst_pad_get_peer (GstPad *pad);
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GstBufferPool* gst_pad_get_bufferpool (GstPad *pad);
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gboolean gst_pad_connect (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps);
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void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad);
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GstPadConnectReturn gst_pad_proxy_connect (GstPad *pad, GstCaps *caps);
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gboolean gst_pad_reconnect_filtered (GstPad *pad, GstCaps *filtercaps);
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gboolean gst_pad_try_reconnect_filtered (GstPad *pad, GstCaps *filtercaps);
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GstCaps* gst_pad_get_allowed_caps (GstPad *pad);
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gboolean gst_pad_recalc_allowed_caps (GstPad *pad);
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#if 1
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void gst_pad_push (GstPad *pad, GstBuffer *buf);
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#else
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#define gst_pad_push(pad,buf) G_STMT_START{ \
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if (((GstRealPad *)(pad))->peer->chainhandler) \
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(((GstRealPad *)(pad))->peer->chainhandler)((GstPad *)(((GstRealPad *)(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_pullregion (GstPad *pad, GstRegionType type,
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guint64 offset, guint64 len);
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#else
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#define gst_pad_pull(pad) \
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( (((GstRealPad *)(pad))->peer->gethandler) ? \
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(((GstRealPad *)(pad))->peer->gethandler)((GstPad *)(((GstRealPad *)(pad))->peer)) : \
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NULL )
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#define gst_pad_pullregion(pad,type,offset,len) \
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( (((GstRealPad *)(pad))->peer->pullregionfunc) ? \
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(((GstRealPad *)(pad))->peer->pullregionfunc)((GstPad *)(((GstRealPad *)(pad))->peer),(type),(offset),(len)) : \
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NULL )
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#endif
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gboolean gst_pad_send_event (GstPad *pad, GstEvent *event);
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void gst_pad_event_default (GstPad *pad, GstEvent *event);
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GstBuffer* gst_pad_peek (GstPad *pad);
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GstPad* gst_pad_select (GList *padlist);
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GstPad* gst_pad_selectv (GstPad *pad, ...);
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#ifndef GST_DISABLE_LOADSAVE
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void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent);
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#endif
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/* ghostpads */
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GstPad* gst_ghost_pad_new (gchar *name,GstPad *pad);
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/* templates and factories */
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GType gst_padtemplate_get_type (void);
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GstPadTemplate* gst_padtemplate_new (gchar *name_template,
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GstPadDirection direction, GstPadPresence presence,
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GstCaps *caps, ...);
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GstCaps* gst_padtemplate_get_caps (GstPadTemplate *templ);
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GstCaps* gst_padtemplate_get_caps_by_name (GstPadTemplate *templ, const gchar *name);
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#ifndef GST_DISABLE_LOADSAVE
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xmlNodePtr gst_padtemplate_save_thyself (GstPadTemplate *templ, xmlNodePtr parent);
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GstPadTemplate* gst_padtemplate_load_thyself (xmlNodePtr parent);
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#endif
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xmlNodePtr gst_pad_ghost_save_thyself (GstPad *pad,
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GstElement *bin,
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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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