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3c94c06c5a
Original commit message from CVS: * gst-libs/gst/audio/gstaudioclock.c: (gst_audio_clock_init), (gst_audio_clock_new): Fix clock name. * gst-libs/gst/audio/gstbaseaudiosink.c: (gst_base_audio_sink_init), (gst_base_audio_sink_query): * gst-libs/gst/audio/gstbaseaudiosrc.c: (gst_base_audio_src_init), (gst_base_audio_src_query), (gst_base_audio_src_get_offset), (gst_base_audio_src_create): Improve latency query code. Use proper clock names.
138 lines
3.8 KiB
C
138 lines
3.8 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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* audioclock.c: Clock for use by audio plugins
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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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/**
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* SECTION:gstaudioclock
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* @short_description: Helper object for implementing audio clocks
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* @see_also: #GstBaseAudioSink, #GstSystemClock
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*
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* #GstAudioClock makes it easy for elements to implement a #GstClock, they
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* simply need to provide a function that returns the current clock time.
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*
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* This object is internally used to implement the clock in #GstBaseAudioSink.
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*
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* Last reviewed on 2006-09-27 (0.10.12)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstaudioclock.h"
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static void gst_audio_clock_class_init (GstAudioClockClass * klass);
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static void gst_audio_clock_init (GstAudioClock * clock);
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static GstClockTime gst_audio_clock_get_internal_time (GstClock * clock);
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static GstSystemClockClass *parent_class = NULL;
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/* static guint gst_audio_clock_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_audio_clock_get_type (void)
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{
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static GType clock_type = 0;
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if (!clock_type) {
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static const GTypeInfo clock_info = {
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sizeof (GstAudioClockClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_audio_clock_class_init,
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NULL,
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NULL,
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sizeof (GstAudioClock),
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4,
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(GInstanceInitFunc) gst_audio_clock_init,
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NULL
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};
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clock_type = g_type_register_static (GST_TYPE_SYSTEM_CLOCK, "GstAudioClock",
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&clock_info, 0);
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}
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return clock_type;
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}
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static void
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gst_audio_clock_class_init (GstAudioClockClass * klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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GstClockClass *gstclock_class;
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gobject_class = (GObjectClass *) klass;
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gstobject_class = (GstObjectClass *) klass;
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gstclock_class = (GstClockClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gstclock_class->get_internal_time = gst_audio_clock_get_internal_time;
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}
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static void
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gst_audio_clock_init (GstAudioClock * clock)
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{
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clock->last_time = 0;
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GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER);
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}
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/**
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* gst_audio_clock_new:
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* @name: the name of the clock
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* @func: a function
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* @user_data: user data
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*
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* Create a new #GstAudioClock instance. Whenever the clock time should be
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* calculated it will call @func with @user_data. When @func returns
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* #GST_CLOCK_TIME_NONE, the clock will return the last reported time.
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*
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* Returns: a new #GstAudioClock casted to a #GstClock.
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*/
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GstClock *
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gst_audio_clock_new (gchar * name, GstAudioClockGetTimeFunc func,
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gpointer user_data)
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{
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GstAudioClock *aclock =
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GST_AUDIO_CLOCK (g_object_new (GST_TYPE_AUDIO_CLOCK, "name", name, NULL));
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aclock->func = func;
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aclock->user_data = user_data;
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return (GstClock *) aclock;
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}
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static GstClockTime
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gst_audio_clock_get_internal_time (GstClock * clock)
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{
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GstAudioClock *aclock = GST_AUDIO_CLOCK (clock);
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GstClockTime result;
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result = aclock->func (clock, aclock->user_data);
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if (result == GST_CLOCK_TIME_NONE)
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result = aclock->last_time;
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else
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aclock->last_time = result;
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return result;
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}
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