/* GStreamer

 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>

 *                    2000 Wim Taymans <wtay@chello.be>

 *

 * audioclock.c: 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.

 */

/**

 * SECTION:gstaudioclock

 * @short_description: Helper object for implementing audio clocks

 * @see_also: #GstBaseAudioSink, #GstSystemClock

 *

 * #GstAudioClock makes it easy for elements to implement a #GstClock, they

 * simply need to provide a function that returns the current clock time.

 *

 * This object is internally used to implement the clock in #GstBaseAudioSink.

 *

 * Last reviewed on 2006-09-27 (0.10.12)

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gstaudioclock.h"

static void gst_audio_clock_class_init (GstAudioClockClass * klass);

static void gst_audio_clock_init (GstAudioClock * clock);

static GstClockTime gst_audio_clock_get_internal_time (GstClock * clock);

static GstSystemClockClass *parent_class = NULL;

/* static guint gst_audio_clock_signals[LAST_SIGNAL] = { 0 }; */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GType

gst_audio_clock_get_type (void)

{

  static GType clock_type = 0;

  if (!clock_type) {

    static const GTypeInfo clock_info = {

      sizeof (GstAudioClockClass),

      NULL,

      NULL,

      (GClassInitFunc) gst_audio_clock_class_init,

      NULL,

      NULL,

      sizeof (GstAudioClock),

      4,

      (GInstanceInitFunc) gst_audio_clock_init,

      NULL

    };

    clock_type = g_type_register_static (GST_TYPE_SYSTEM_CLOCK, "GstAudioClock",

        &clock_info, 0);

  }

  return clock_type;

}

static void

gst_audio_clock_class_init (GstAudioClockClass * klass)

{

  GObjectClass *gobject_class;

  GstObjectClass *gstobject_class;

  GstClockClass *gstclock_class;

  gobject_class = (GObjectClass *) klass;

  gstobject_class = (GstObjectClass *) klass;

  gstclock_class = (GstClockClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

  gstclock_class->get_internal_time = gst_audio_clock_get_internal_time;

}

static void

gst_audio_clock_init (GstAudioClock * clock)

{

  clock->last_time = 0;

  GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER);

}

/**

 * gst_audio_clock_new:

 * @name: the name of the clock

 * @func: a function

 * @user_data: user data

 *

 * Create a new #GstAudioClock instance. Whenever the clock time should be

 * calculated it will call @func with @user_data. When @func returns

 * #GST_CLOCK_TIME_NONE, the clock will return the last reported time.

 *

 * Returns: a new #GstAudioClock casted to a #GstClock.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GstClock *

    gpointer user_data)

{

  GstAudioClock *aclock =

      GST_AUDIO_CLOCK (g_object_new (GST_TYPE_AUDIO_CLOCK, "name", name, NULL));

  aclock->func = func;

  aclock->user_data = user_data;

  return (GstClock *) aclock;

}

static GstClockTime

gst_audio_clock_get_internal_time (GstClock * clock)

{

  GstClockTime result;

  result = aclock->func (clock, aclock->user_data);

    result = aclock->last_time;

  return result;

}