author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 16 Apr 2010 15:15:52 +0300 | |
changeset 8 | 4a7fac7dd34a |
parent 0 | 0e761a78d257 |
child 30 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* 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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/** |
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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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GST_DEBUG_CATEGORY_STATIC (gst_audio_clock_debug); |
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#define GST_CAT_DEFAULT gst_audio_clock_debug |
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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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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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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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GST_DEBUG_CATEGORY_INIT (gst_audio_clock_debug, "audioclock", 0, |
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"audioclock"); |
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} |
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static void |
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gst_audio_clock_init (GstAudioClock * clock) |
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105 |
{ |
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clock->last_time = 0; |
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clock->abidata.ABI.time_offset = 0; |
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GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER); |
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} |
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110 |
|
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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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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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126 |
|
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GstClock * |
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gst_audio_clock_new (const gchar * name, GstAudioClockGetTimeFunc func, |
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gpointer user_data) |
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130 |
{ |
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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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133 |
|
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aclock->func = func; |
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aclock->user_data = user_data; |
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136 |
|
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return (GstClock *) aclock; |
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} |
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139 |
|
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/** |
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* gst_audio_clock_reset: |
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* @clock: a #GstAudioClock |
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* @time: a #GstClockTime |
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* |
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* Inform @clock that future calls to #GstAudioClockGetTimeFunc will return values |
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* starting from @time. The clock will update an internal offset to make sure that |
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* future calls to internal_time will return an increasing result as required by |
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* the #GstClock object. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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153 |
|
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void |
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gst_audio_clock_reset (GstAudioClock * clock, GstClockTime time) |
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{ |
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GstClockTimeDiff time_offset; |
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|
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if (clock->last_time >= time) |
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time_offset = clock->last_time - time; |
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else |
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time_offset = -(time - clock->last_time); |
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163 |
|
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clock->abidata.ABI.time_offset = time_offset; |
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165 |
|
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GST_DEBUG_OBJECT (clock, |
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"reset clock to %" GST_TIME_FORMAT ", offset %" GST_TIME_FORMAT, |
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GST_TIME_ARGS (time), GST_TIME_ARGS (time_offset)); |
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} |
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170 |
|
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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; |
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GstClockTime result; |
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|
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aclock = GST_AUDIO_CLOCK_CAST (clock); |
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178 |
|
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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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result += aclock->abidata.ABI.time_offset; |
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/* clock must be increasing */ |
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if (aclock->last_time < result) |
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aclock->last_time = result; |
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else |
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result = aclock->last_time; |
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} |
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|
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GST_DEBUG_OBJECT (clock, |
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"result %" GST_TIME_FORMAT ", last_time %" GST_TIME_FORMAT, |
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GST_TIME_ARGS (result), GST_TIME_ARGS (aclock->last_time)); |
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|
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return result; |
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} |
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197 |
|
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/** |
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* gst_audio_clock_get_time: |
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* @clock: a #GstAudioClock |
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* |
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* Report the time as returned by the #GstAudioClockGetTimeFunc without applying |
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* any offsets. |
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* |
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* Returns: the time as reported by the time function of the audio clock |
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* |
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* Since: 0.10.23 |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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GstClockTime |
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gst_audio_clock_get_time (GstClock * clock) |
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{ |
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GstAudioClock *aclock; |
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GstClockTime result; |
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|
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aclock = GST_AUDIO_CLOCK_CAST (clock); |
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|
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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 - aclock->abidata.ABI.time_offset; |
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} |
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|
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return result; |
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} |
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|
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/** |
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* gst_audio_clock_adjust: |
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* @clock: a #GstAudioClock |
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* @time: a #GstClockTime |
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* |
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* Adjust @time with the internal offset of the audio clock. |
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* |
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* Returns: @time adjusted with the internal offset. |
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* |
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* Since: 0.10.23 |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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GstClockTime |
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gst_audio_clock_adjust (GstClock * clock, GstClockTime time) |
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{ |
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GstAudioClock *aclock; |
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GstClockTime result; |
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|
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aclock = GST_AUDIO_CLOCK_CAST (clock); |
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result = time + aclock->abidata.ABI.time_offset; |
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|
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return result; |
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} |