author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 8 | 7e817e7e631c |
parent 7 | 567bb019e3e3 |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com> |
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* |
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* gstmessage.h: Header for GstMessage subsystem |
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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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#ifndef __GST_MESSAGE_H__ |
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#define __GST_MESSAGE_H__ |
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|
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G_BEGIN_DECLS |
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|
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typedef struct _GstMessage GstMessage; |
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typedef struct _GstMessageClass GstMessageClass; |
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|
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/** |
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* GstMessageType: |
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* @GST_MESSAGE_UNKNOWN: an undefined message |
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* @GST_MESSAGE_EOS: end-of-stream reached in a pipeline. The application will |
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* only receive this message in the PLAYING state and every time it sets a |
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* pipeline to PLAYING that is in the EOS state. The application can perform a |
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* flushing seek in the pipeline, which will undo the EOS state again. |
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* @GST_MESSAGE_ERROR: an error occured. Whe the application receives an error |
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* message it should stop playback of the pipeline and not assume that more |
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* data will be played. |
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* @GST_MESSAGE_WARNING: a warning occured. |
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* @GST_MESSAGE_INFO: an info message occured |
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* @GST_MESSAGE_TAG: a tag was found. |
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* @GST_MESSAGE_BUFFERING: the pipeline is buffering. When the application |
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* receives a buffering message in the PLAYING state for a non-live pipeline it |
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* must PAUSE the pipeline until the buffering completes, when the percentage |
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* field in the message is 100%. For live pipelines, no action must be |
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* performed and the buffering percentage can be used to inform the user about |
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* the progress. |
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* @GST_MESSAGE_STATE_CHANGED: a state change happened |
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* @GST_MESSAGE_STATE_DIRTY: an element changed state in a streaming thread. |
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* This message is deprecated. |
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* @GST_MESSAGE_STEP_DONE: a framestep finished. This message is not yet |
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* implemented. |
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* @GST_MESSAGE_CLOCK_PROVIDE: an element notifies its capability of providing |
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* a clock. This message is used internally and |
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* never forwarded to the application. |
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* @GST_MESSAGE_CLOCK_LOST: The current clock as selected by the pipeline became |
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* unusable. The pipeline will select a new clock on |
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* the next PLAYING state change. |
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* @GST_MESSAGE_NEW_CLOCK: a new clock was selected in the pipeline. |
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* @GST_MESSAGE_STRUCTURE_CHANGE: the structure of the pipeline changed. Not |
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* implemented yet. |
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* @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts, |
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* stops, errors, etc.. Not implemented yet. |
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* @GST_MESSAGE_APPLICATION: message posted by the application, possibly |
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* via an application-specific element. |
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* @GST_MESSAGE_ELEMENT: element-specific message, see the specific element's |
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* documentation |
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* @GST_MESSAGE_SEGMENT_START: pipeline started playback of a segment. This |
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* message is used internally and never forwarded to the application. |
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* @GST_MESSAGE_SEGMENT_DONE: pipeline completed playback of a segment. This |
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* message is forwarded to the application after all elements that posted |
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* @GST_MESSAGE_SEGMENT_START posted a GST_MESSAGE_SEGMENT_DONE message. |
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* @GST_MESSAGE_DURATION: The duration of a pipeline changed. The application |
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* can get the new duration with a duration query. |
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* @GST_MESSAGE_ASYNC_START: Posted by elements when they start an ASYNC state |
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* change. This message is not forwarded to the application but is used |
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* internally. Since: 0.10.13. |
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* @GST_MESSAGE_ASYNC_DONE: Posted by elements when they complete an ASYNC state |
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* change. The application will only receive this message from the toplevel |
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* pipeline. Since: 0.10.13 |
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* @GST_MESSAGE_LATENCY: Posted by elements when their latency changes. The |
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* pipeline will calculate and distribute a new latency. Since: 0.10.12 |
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* @GST_MESSAGE_ANY: mask for all of the above messages. |
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* |
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* The different message types that are available. |
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*/ |
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/* NOTE: keep in sync with quark registration in gstmessage.c |
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* NOTE: keep GST_MESSAGE_ANY a valid gint to avoid compiler warnings. |
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*/ |
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typedef enum |
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{ |
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GST_MESSAGE_UNKNOWN = 0, |
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GST_MESSAGE_EOS = (1 << 0), |
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GST_MESSAGE_ERROR = (1 << 1), |
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GST_MESSAGE_WARNING = (1 << 2), |
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GST_MESSAGE_INFO = (1 << 3), |
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GST_MESSAGE_TAG = (1 << 4), |
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GST_MESSAGE_BUFFERING = (1 << 5), |
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GST_MESSAGE_STATE_CHANGED = (1 << 6), |
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GST_MESSAGE_STATE_DIRTY = (1 << 7), |
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GST_MESSAGE_STEP_DONE = (1 << 8), |
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GST_MESSAGE_CLOCK_PROVIDE = (1 << 9), |
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GST_MESSAGE_CLOCK_LOST = (1 << 10), |
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GST_MESSAGE_NEW_CLOCK = (1 << 11), |
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GST_MESSAGE_STRUCTURE_CHANGE = (1 << 12), |
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GST_MESSAGE_STREAM_STATUS = (1 << 13), |
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GST_MESSAGE_APPLICATION = (1 << 14), |
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GST_MESSAGE_ELEMENT = (1 << 15), |
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GST_MESSAGE_SEGMENT_START = (1 << 16), |
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GST_MESSAGE_SEGMENT_DONE = (1 << 17), |
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GST_MESSAGE_DURATION = (1 << 18), |
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GST_MESSAGE_LATENCY = (1 << 19), |
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GST_MESSAGE_ASYNC_START = (1 << 20), |
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GST_MESSAGE_ASYNC_DONE = (1 << 21), |
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GST_MESSAGE_ANY = ~0 |
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} GstMessageType; |
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|
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#include <gst/gstminiobject.h> |
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#include <gst/gstobject.h> |
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#include <gst/gstelement.h> |
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#include <gst/gsttaglist.h> |
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#include <gst/gststructure.h> |
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|
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/** |
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* GST_MESSAGE_TRACE_NAME: |
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* |
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* The name used for memory allocation tracing |
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*/ |
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#define GST_MESSAGE_TRACE_NAME "GstMessage" |
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|
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#define GST_TYPE_MESSAGE (gst_message_get_type()) |
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#define GST_IS_MESSAGE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MESSAGE)) |
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#define GST_IS_MESSAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MESSAGE)) |
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#define GST_MESSAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_MESSAGE, GstMessageClass)) |
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#define GST_MESSAGE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MESSAGE, GstMessage)) |
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#define GST_MESSAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MESSAGE, GstMessageClass)) |
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#define GST_MESSAGE_CAST(obj) ((GstMessage*)(obj)) |
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|
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/* the lock is used to handle the synchronous handling of messages, |
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* the emiting thread is block until the handling thread processed |
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* the message using this mutex/cond pair */ |
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#define GST_MESSAGE_GET_LOCK(message) (GST_MESSAGE(message)->lock) |
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#define GST_MESSAGE_LOCK(message) g_mutex_lock(GST_MESSAGE_GET_LOCK(message)) |
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#define GST_MESSAGE_UNLOCK(message) g_mutex_unlock(GST_MESSAGE_GET_LOCK(message)) |
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#define GST_MESSAGE_COND(message) (GST_MESSAGE(message)->cond) |
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#define GST_MESSAGE_WAIT(message) g_cond_wait(GST_MESSAGE_COND(message),GST_MESSAGE_GET_LOCK(message)) |
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#define GST_MESSAGE_SIGNAL(message) g_cond_signal(GST_MESSAGE_COND(message)) |
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|
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/** |
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* GST_MESSAGE_TYPE: |
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* @message: a #GstMessage |
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* |
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* Get the #GstMessageType of @message. |
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*/ |
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#define GST_MESSAGE_TYPE(message) (GST_MESSAGE(message)->type) |
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/** |
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* GST_MESSAGE_TYPE_NAME: |
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* @message: a #GstMessage |
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* |
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* Get a constant string representation of the #GstMessageType of @message. |
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* |
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* Since: 0.10.4 |
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*/ |
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#define GST_MESSAGE_TYPE_NAME(message) gst_message_type_get_name(GST_MESSAGE_TYPE(message)) |
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/** |
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* GST_MESSAGE_TIMESTAMP: |
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* @message: a #GstMessage |
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* |
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* Get the timestamp of @message. This is the timestamp when the message |
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* was created. |
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*/ |
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#define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE(message)->timestamp) |
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/** |
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* GST_MESSAGE_SRC: |
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* @message: a #GstMessage |
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* |
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* Get the object that posted @message. |
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*/ |
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#define GST_MESSAGE_SRC(message) (GST_MESSAGE(message)->src) |
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|
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/** |
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* GstMessage: |
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* @mini_object: the parent structure |
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* @type: the #GstMessageType of the message |
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* @timestamp: the timestamp of the message |
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* @src: the src of the message |
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* @structure: the #GstStructure containing the message info. |
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* |
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* A #GstMessage. |
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*/ |
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struct _GstMessage |
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{ |
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GstMiniObject mini_object; |
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|
8 | 196 |
/*< private > *//* with MESSAGE_LOCK */ |
0
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GMutex *lock; /* lock and cond for async delivery */ |
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GCond *cond; |
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199 |
|
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/*< public > *//* with COW */ |
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GstMessageType type; |
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guint64 timestamp; |
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GstObject *src; |
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GstStructure *structure; |
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/*< private > */ |
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gpointer _gst_reserved[GST_PADDING]; |
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}; |
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struct _GstMessageClass { |
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GstMiniObjectClass mini_object_class; |
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/*< private > */ |
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gpointer _gst_reserved[GST_PADDING]; |
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}; |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GType gst_message_get_type (void); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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const gchar* gst_message_type_get_name (GstMessageType type); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GQuark gst_message_type_to_quark (GstMessageType type); |
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/* refcounting */ |
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/** |
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* gst_message_ref: |
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* @msg: the message to ref |
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* |
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* Convenience macro to increase the reference count of the message. |
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* |
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* Returns: @msg (for convenience when doing assignments) |
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*/ |
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#ifdef _FOOL_GTK_DOC_ |
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G_INLINE_FUNC GstMessage * gst_message_ref (GstMessage * msg); |
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#endif |
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static inline GstMessage * |
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gst_message_ref (GstMessage * msg) |
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{ |
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/* not using a macro here because gcc-4.1 will complain |
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* if the return value isn't used (because of the cast) */ |
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return (GstMessage *) gst_mini_object_ref (GST_MINI_OBJECT (msg)); |
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} |
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/** |
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* gst_message_unref: |
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* @msg: the message to unref |
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* |
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* Convenience macro to decrease the reference count of the message, possibly |
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* freeing it. |
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*/ |
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#define gst_message_unref(msg) gst_mini_object_unref (GST_MINI_OBJECT (msg)) |
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/* copy message */ |
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/** |
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* gst_message_copy: |
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* @msg: the message to copy |
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* |
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* Creates a copy of the message. Returns a copy of the message. |
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* |
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* MT safe |
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*/ |
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#define gst_message_copy(msg) GST_MESSAGE (gst_mini_object_copy (GST_MINI_OBJECT (msg))) |
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/** |
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* gst_message_make_writable: |
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* @msg: the message to make writable |
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* |
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* Checks if a message is writable. If not, a writable copy is made and |
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* returned. Returns a message (possibly a duplicate) that is writable. |
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* |
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* MT safe |
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*/ |
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#define gst_message_make_writable(msg) GST_MESSAGE (gst_mini_object_make_writable (GST_MINI_OBJECT (msg))) |
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|
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GstMessage * gst_message_new_eos (GstObject * src); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_error (GstObject * src, GError * error, gchar * debug); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_warning (GstObject * src, GError * error, gchar * debug); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_info (GstObject * src, GError * error, gchar * debug); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_buffering (GstObject * src, gint percent); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_state_changed (GstObject * src, GstState oldstate, |
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GstState newstate, GstState pending); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_state_dirty (GstObject * src); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_clock_provide (GstObject * src, GstClock *clock, gboolean ready); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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GstMessage * gst_message_new_clock_lost (GstObject * src, GstClock *clock); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_new_clock (GstObject * src, GstClock *clock); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_application (GstObject * src, GstStructure * structure); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_element (GstObject * src, GstStructure * structure); |
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IMPORT_C |
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#endif |
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GstMessage * gst_message_new_segment_start (GstObject * src, GstFormat format, gint64 position); |
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#endif |
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GstMessage * gst_message_new_segment_done (GstObject * src, GstFormat format, gint64 position); |
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#endif |
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GstMessage * gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration); |
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#endif |
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GstMessage * gst_message_new_async_start (GstObject * src, gboolean new_base_time); |
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#endif |
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GstMessage * gst_message_new_async_done (GstObject * src); |
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GstMessage * gst_message_new_latency (GstObject * src); |
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#endif |
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GstMessage * gst_message_new_custom (GstMessageType type, |
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GstObject * src, |
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GstStructure * structure); |
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void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug); |
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#ifdef __SYMBIAN32__ |
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#endif |
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void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug); |
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void gst_message_parse_info (GstMessage *message, GError **gerror, gchar **debug); |
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#ifdef __SYMBIAN32__ |
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void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list); |
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void gst_message_parse_buffering (GstMessage *message, gint *percent); |
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#ifdef __SYMBIAN32__ |
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void gst_message_parse_state_changed (GstMessage *message, GstState *oldstate, |
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GstState *newstate, GstState *pending); |
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IMPORT_C |
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void gst_message_parse_clock_provide (GstMessage *message, GstClock **clock, gboolean *ready); |
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#ifdef __SYMBIAN32__ |
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void gst_message_parse_clock_lost (GstMessage *message, GstClock **clock); |
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#ifdef __SYMBIAN32__ |
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void gst_message_parse_new_clock (GstMessage *message, GstClock **clock); |
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void gst_message_parse_segment_start (GstMessage *message, GstFormat *format, gint64 *position); |
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void gst_message_parse_segment_done (GstMessage *message, GstFormat *format, gint64 *position); |
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#ifdef __SYMBIAN32__ |
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#endif |
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void gst_message_parse_duration (GstMessage *message, GstFormat *format, gint64 *duration); |
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#endif |
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void gst_message_parse_async_start (GstMessage *message, gboolean *new_base_time); |
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#ifdef __SYMBIAN32__ |
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#endif |
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const GstStructure * gst_message_get_structure (GstMessage *message); |
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G_END_DECLS |
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#endif /* __GST_MESSAGE_H__ */ |