--- /dev/null
+/* 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"
+
+GST_DEBUG_CATEGORY_STATIC (gst_audio_clock_debug);
+#define GST_CAT_DEFAULT gst_audio_clock_debug
+
+static void gst_audio_clock_class_init (GstAudioClockClass * klass);
+static void gst_audio_clock_init (GstAudioClock * clock);
+
+static void gst_audio_clock_dispose (GObject * object);
+
+static GstClockTime gst_audio_clock_get_internal_time (GstClock * clock);
+
+static GstSystemClockClass *parent_class = NULL;
+
+/* static guint gst_audio_clock_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_audio_clock_get_type (void)
+{
+ static volatile gsize clock_type = 0;
+ 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
+ };
+
+ if (g_once_init_enter (&clock_type)) {
+ GType tmp = g_type_register_static (GST_TYPE_SYSTEM_CLOCK, "GstAudioClock",
+ &clock_info, 0);
+ g_once_init_leave (&clock_type, tmp);
+ }
+
+ return (GType) clock_type;
+}
+
+static void
+gst_audio_clock_class_init (GstAudioClockClass * klass)
+{
+ GstClockClass *gstclock_class;
+ GObjectClass *gobject_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstclock_class = (GstClockClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gobject_class->dispose = gst_audio_clock_dispose;
+ gstclock_class->get_internal_time = gst_audio_clock_get_internal_time;
+
+ GST_DEBUG_CATEGORY_INIT (gst_audio_clock_debug, "audioclock", 0,
+ "audioclock");
+}
+
+static void
+gst_audio_clock_init (GstAudioClock * clock)
+{
+ GST_DEBUG_OBJECT (clock, "init");
+ clock->last_time = 0;
+ clock->abidata.ABI.time_offset = 0;
+ GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER);
+}
+
+static void
+gst_audio_clock_dispose (GObject * object)
+{
+ GstAudioClock *clock = GST_AUDIO_CLOCK (object);
+
+ if (clock->abidata.ABI.destroy_notify && clock->user_data)
+ clock->abidata.ABI.destroy_notify (clock->user_data);
+ clock->abidata.ABI.destroy_notify = NULL;
+ clock->user_data = NULL;
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+/**
+ * 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.
+ */
+GstClock *
+gst_audio_clock_new (const gchar * name, GstAudioClockGetTimeFunc func,
+ 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;
+}
+
+/**
+ * gst_audio_clock_new_full:
+ * @name: the name of the clock
+ * @func: a function
+ * @user_data: user data
+ * @destroy_notify: #GDestroyNotify for @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.
+ *
+ * Since: 0.10.31
+ */
+GstClock *
+gst_audio_clock_new_full (const gchar * name, GstAudioClockGetTimeFunc func,
+ gpointer user_data, GDestroyNotify destroy_notify)
+{
+ GstAudioClock *aclock =
+ GST_AUDIO_CLOCK (g_object_new (GST_TYPE_AUDIO_CLOCK, "name", name, NULL));
+
+ aclock->func = func;
+ aclock->user_data = user_data;
+ aclock->abidata.ABI.destroy_notify = destroy_notify;
+
+ return (GstClock *) aclock;
+}
+
+/**
+ * gst_audio_clock_reset:
+ * @clock: a #GstAudioClock
+ * @time: a #GstClockTime
+ *
+ * Inform @clock that future calls to #GstAudioClockGetTimeFunc will return values
+ * starting from @time. The clock will update an internal offset to make sure that
+ * future calls to internal_time will return an increasing result as required by
+ * the #GstClock object.
+ */
+void
+gst_audio_clock_reset (GstAudioClock * clock, GstClockTime time)
+{
+ GstClockTimeDiff time_offset;
+
+ if (clock->last_time >= time)
+ time_offset = clock->last_time - time;
+ else
+ time_offset = -(time - clock->last_time);
+
+ clock->abidata.ABI.time_offset = time_offset;
+
+ GST_DEBUG_OBJECT (clock,
+ "reset clock to %" GST_TIME_FORMAT ", last %" GST_TIME_FORMAT ", offset %"
+ GST_TIME_FORMAT, GST_TIME_ARGS (time), GST_TIME_ARGS (clock->last_time),
+ GST_TIME_ARGS (time_offset));
+}
+
+static GstClockTime
+gst_audio_clock_func_invalid (GstClock * clock, gpointer user_data)
+{
+ return GST_CLOCK_TIME_NONE;
+}
+
+static GstClockTime
+gst_audio_clock_get_internal_time (GstClock * clock)
+{
+ GstAudioClock *aclock;
+ GstClockTime result;
+
+ aclock = GST_AUDIO_CLOCK_CAST (clock);
+
+ result = aclock->func (clock, aclock->user_data);
+ if (result == GST_CLOCK_TIME_NONE) {
+ result = aclock->last_time;
+ } else {
+ result += aclock->abidata.ABI.time_offset;
+ /* clock must be increasing */
+ if (aclock->last_time < result)
+ aclock->last_time = result;
+ else
+ result = aclock->last_time;
+ }
+
+ GST_DEBUG_OBJECT (clock,
+ "result %" GST_TIME_FORMAT ", last_time %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (result), GST_TIME_ARGS (aclock->last_time));
+
+ return result;
+}
+
+/**
+ * gst_audio_clock_get_time:
+ * @clock: a #GstAudioClock
+ *
+ * Report the time as returned by the #GstAudioClockGetTimeFunc without applying
+ * any offsets.
+ *
+ * Returns: the time as reported by the time function of the audio clock
+ *
+ * Since: 0.10.23
+ */
+GstClockTime
+gst_audio_clock_get_time (GstClock * clock)
+{
+ GstAudioClock *aclock;
+ GstClockTime result;
+
+ aclock = GST_AUDIO_CLOCK_CAST (clock);
+
+ result = aclock->func (clock, aclock->user_data);
+ if (result == GST_CLOCK_TIME_NONE) {
+ GST_DEBUG_OBJECT (clock, "no time, reuse last");
+ result = aclock->last_time - aclock->abidata.ABI.time_offset;
+ }
+
+ GST_DEBUG_OBJECT (clock,
+ "result %" GST_TIME_FORMAT ", last_time %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (result), GST_TIME_ARGS (aclock->last_time));
+
+ return result;
+}
+
+/**
+ * gst_audio_clock_adjust:
+ * @clock: a #GstAudioClock
+ * @time: a #GstClockTime
+ *
+ * Adjust @time with the internal offset of the audio clock.
+ *
+ * Returns: @time adjusted with the internal offset.
+ *
+ * Since: 0.10.23
+ */
+GstClockTime
+gst_audio_clock_adjust (GstClock * clock, GstClockTime time)
+{
+ GstAudioClock *aclock;
+ GstClockTime result;
+
+ aclock = GST_AUDIO_CLOCK_CAST (clock);
+
+ result = time + aclock->abidata.ABI.time_offset;
+
+ return result;
+}
+
+/**
+ * gst_audio_clock_invalidate:
+ * @clock: a #GstAudioClock
+ *
+ * Invalidate the clock function. Call this function when the provided
+ * #GstAudioClockGetTimeFunc cannot be called anymore, for example, when the
+ * user_data becomes invalid.
+ *
+ * After calling this function, @clock will return the last returned time for
+ * the rest of its lifetime.
+ *
+ * Since: 0.10.31
+ */
+void
+gst_audio_clock_invalidate (GstClock * clock)
+{
+ GstAudioClock *aclock;
+
+ aclock = GST_AUDIO_CLOCK_CAST (clock);
+
+ aclock->func = gst_audio_clock_func_invalid;
+}
projects / mafwsubrenderer / blobdiff