gstreamer/gst-libs/gst/audio/gstaudioclock.h
Sebastian Dröge 8989ad93d9 audioclock: API: Add gst_audio_clock_new_full() with a GDestroyNotify for the user_data
Elements usually use their own instance as instance data but the
clock can have a longer lifetime than their elements and the clock
doesn't own a reference of the element.

Fixes bug #623807.
2010-07-16 17:40:17 +02:00

106 lines
3.4 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2005 Wim Taymans <wim@fluendo.com>
*
* gstaudioclock.h: Clock for use by audio plugins
*
* 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_AUDIO_CLOCK_H__
#define __GST_AUDIO_CLOCK_H__
#include <gst/gst.h>
#include <gst/gstsystemclock.h>
G_BEGIN_DECLS
#define GST_TYPE_AUDIO_CLOCK \
(gst_audio_clock_get_type())
#define GST_AUDIO_CLOCK(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_CLOCK,GstAudioClock))
#define GST_AUDIO_CLOCK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_CLOCK,GstAudioClockClass))
#define GST_IS_AUDIO_CLOCK(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_CLOCK))
#define GST_IS_AUDIO_CLOCK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_CLOCK))
#define GST_AUDIO_CLOCK_CAST(obj) \
((GstAudioClock*)(obj))
typedef struct _GstAudioClock GstAudioClock;
typedef struct _GstAudioClockClass GstAudioClockClass;
/**
* GstAudioClockGetTimeFunc:
* @clock: the #GstAudioClock
* @user_data: user data
*
* This function will be called whenever the current clock time needs to be
* calculated. If this function returns #GST_CLOCK_TIME_NONE, the last reported
* time will be returned by the clock.
*
* Returns: the current time or #GST_CLOCK_TIME_NONE if the previous time should
* be used.
*/
typedef GstClockTime (*GstAudioClockGetTimeFunc) (GstClock *clock, gpointer user_data);
/**
* GstAudioClock:
* @clock: parent #GstSystemClock
*
* Opaque #GstAudioClock.
*/
struct _GstAudioClock {
GstSystemClock clock;
/* --- protected --- */
GstAudioClockGetTimeFunc func;
gpointer user_data;
GstClockTime last_time;
/*< private >*/
union {
struct {
GstClockTimeDiff time_offset;
GDestroyNotify destroy_notify;
} ABI;
/* adding + 0 to mark ABI change to be undone later */
gpointer _gst_reserved[GST_PADDING + 0];
} abidata;
};
struct _GstAudioClockClass {
GstSystemClockClass parent_class;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
GType gst_audio_clock_get_type (void);
GstClock* gst_audio_clock_new (const gchar *name, GstAudioClockGetTimeFunc func,
gpointer user_data);
GstClock* gst_audio_clock_new_full (const gchar *name, GstAudioClockGetTimeFunc func,
gpointer user_data, GDestroyNotify destroy_notify);
void gst_audio_clock_reset (GstAudioClock *clock, GstClockTime time);
GstClockTime gst_audio_clock_get_time (GstClock * clock);
GstClockTime gst_audio_clock_adjust (GstClock * clock, GstClockTime time);
G_END_DECLS
#endif /* __GST_AUDIO_CLOCK_H__ */