gstreamer/gst/base/gstbasesink.h

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstbasesink.h:
*
* 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_BASESINK_H__
#define __GST_BASESINK_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_BASESINK (gst_base_sink_get_type())
#define GST_BASESINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASESINK,GstBaseSink))
#define GST_BASESINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASESINK,GstBaseSinkClass))
#define GST_BASESINK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASESINK, GstBaseSinkClass))
#define GST_IS_BASESINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASESINK))
#define GST_IS_BASESINK_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASESINK))
#define GST_BASESINK_CLOCK(obj) (GST_BASESINK (obj)->clock)
#define GST_BASESINK_PAD(obj) (GST_BASESINK (obj)->sinkpad)
typedef struct _GstBaseSink GstBaseSink;
typedef struct _GstBaseSinkClass GstBaseSinkClass;
/* a base class for implementing chain based sinks
*
* Preroll, EOS, state changes are all handled.
*/
struct _GstBaseSink {
GstElement element;
GstPad *sinkpad;
GstActivateMode pad_mode;
/*< protected >*/ /* with PREROLL_LOCK */
GQueue *preroll_queue;
gint preroll_queue_max_len;
guint64 offset;
gboolean has_loop;
gboolean has_chain;
GstClock *clock;
GstClockID clock_id;
GstClockTime end_time;
gboolean eos;
gboolean need_preroll;
gboolean have_preroll;
};
struct _GstBaseSinkClass {
GstElementClass parent_class;
/* get caps from subclass */
GstCaps* (*get_caps) (GstBaseSink *sink);
/* notify subclass of new caps */
gboolean (*set_caps) (GstBaseSink *sink, GstCaps *caps);
/* allocate a new buffer with given caps */
GstFlowReturn (*buffer_alloc) (GstBaseSink *sink, guint64 offset, guint size,
GstCaps *caps, GstBuffer **buf);
/* get the start and end times for syncing on this buffer */
void (*get_times) (GstBaseSink *sink, GstBuffer *buffer,
GstClockTime *start, GstClockTime *end);
/* unlock any pending access to the resource. subclasses should unlock
* any function ASAP. */
gboolean (*unlock) (GstBaseSink *sink);
/* notify subclass of event, preroll buffer or real buffer */
gboolean (*event) (GstBaseSink *sink, GstEvent *event);
GstFlowReturn (*preroll) (GstBaseSink *sink, GstBuffer *buffer);
GstFlowReturn (*render) (GstBaseSink *sink, GstBuffer *buffer);
};
GType gst_base_sink_get_type(void);
G_END_DECLS
#endif /* __GST_BASESINK_H__ */