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db79dd88c3
Simply use casting macros for accessing the message fields like we do for buffers and events. Avoids some costly typechecking that does not really buy us much.
485 lines
20 KiB
C
485 lines
20 KiB
C
/* 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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#ifndef __GST_MESSAGE_H__
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#define __GST_MESSAGE_H__
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G_BEGIN_DECLS
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typedef struct _GstMessage GstMessage;
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typedef struct _GstMessageClass GstMessageClass;
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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. This
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* message is used internally and never forwarded to the application.
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* @GST_MESSAGE_STREAM_STATUS: status about a stream, emitted when it starts,
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* stops, errors, etc..
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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_REQUEST_STATE: Posted by elements when they want the pipeline to
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* change state. This message is a suggestion to the application which can
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* decide to perform the state change on (part of) the pipeline. Since: 0.10.23.
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* @GST_MESSAGE_STEP_START: A stepping operation was started.
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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_REQUEST_STATE = (1 << 22),
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GST_MESSAGE_STEP_START = (1 << 23),
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GST_MESSAGE_ANY = ~0
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} GstMessageType;
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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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* 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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#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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/* 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_CAST(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_CAST(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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* 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_CAST(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_CAST(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_CAST(message)->src)
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/**
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* GST_MESSAGE_SRC_NAME:
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* @message: a #GstMessage
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*
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* Get the name of the object that posted @message. Returns "(NULL)" if
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* the message has no source object set.
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*
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* Since: 0.10.24
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*/
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#define GST_MESSAGE_SRC_NAME(message) (GST_MESSAGE_SRC(message) ? \
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GST_OBJECT_NAME (GST_MESSAGE_SRC(message)) : "(NULL)")
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/**
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* GstStructureChangeType:
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* @GST_STRUCTURE_CHANGE_TYPE_PAD_LINK: Pad linking is starting or done.
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* @GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK: Pad unlinking is starting or done.
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*
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* The type of a #GstMessageStructureChange.
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*
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* Since: 0.10.22
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*/
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typedef enum {
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GST_STRUCTURE_CHANGE_TYPE_PAD_LINK = 0,
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GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK = 1
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} GstStructureChangeType;
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/**
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* GstStreamStatusType:
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* @GST_STREAM_STATUS_TYPE_CREATE: A new thread need to be created.
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* @GST_STREAM_STATUS_TYPE_ENTER: a thread entered its loop function
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* @GST_STREAM_STATUS_TYPE_LEAVE: a thread left its loop function
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* @GST_STREAM_STATUS_TYPE_DESTROY: a thread is destroyed
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* @GST_STREAM_STATUS_TYPE_START: a thread is started
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* @GST_STREAM_STATUS_TYPE_PAUSE: a thread is paused
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* @GST_STREAM_STATUS_TYPE_STOP: a thread is stopped
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*
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* The type of a #GstMessageStreamStatus. The stream status messages inform the
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* application of new streaming threads and their status.
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*
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* Since: 0.10.24
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*/
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typedef enum {
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GST_STREAM_STATUS_TYPE_CREATE = 0,
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GST_STREAM_STATUS_TYPE_ENTER = 1,
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GST_STREAM_STATUS_TYPE_LEAVE = 2,
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GST_STREAM_STATUS_TYPE_DESTROY = 3,
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GST_STREAM_STATUS_TYPE_START = 8,
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GST_STREAM_STATUS_TYPE_PAUSE = 9,
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GST_STREAM_STATUS_TYPE_STOP = 10
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} GstStreamStatusType;
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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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/*< private >*//* with MESSAGE_LOCK */
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GMutex *lock; /* lock and cond for async delivery */
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GCond *cond;
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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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union {
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struct {
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guint32 seqnum;
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} ABI;
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/* + 0 to mark ABI change for future greppage */
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gpointer _gst_reserved[GST_PADDING + 0];
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} abidata;
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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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GType gst_message_get_type (void);
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const gchar* gst_message_type_get_name (GstMessageType type);
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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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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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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_message_unref (GstMessage * msg);
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#endif
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static inline void
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gst_message_unref (GstMessage * msg)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (msg));
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}
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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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* Returns: a new copy of @msg.
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*
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* MT safe
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstMessage * gst_message_copy (const GstMessage * msg);
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#endif
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static inline GstMessage *
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gst_message_copy (const GstMessage * msg)
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{
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return GST_MESSAGE_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CAST (msg)));
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}
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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_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT (msg)))
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/* identifiers for events and messages */
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guint32 gst_message_get_seqnum (GstMessage *message);
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void gst_message_set_seqnum (GstMessage *message, guint32 seqnum);
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/* EOS */
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GstMessage * gst_message_new_eos (GstObject * src);
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/* ERROR */
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GstMessage * gst_message_new_error (GstObject * src, GError * error, const gchar * debug);
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void gst_message_parse_error (GstMessage *message, GError **gerror, gchar **debug);
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/* WARNING */
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GstMessage * gst_message_new_warning (GstObject * src, GError * error, const gchar * debug);
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void gst_message_parse_warning (GstMessage *message, GError **gerror, gchar **debug);
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/* INFO */
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GstMessage * gst_message_new_info (GstObject * src, GError * error, const gchar * debug);
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void gst_message_parse_info (GstMessage *message, GError **gerror, gchar **debug);
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/* TAG */
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GstMessage * gst_message_new_tag (GstObject * src, GstTagList * tag_list);
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GstMessage * gst_message_new_tag_full (GstObject * src, GstPad *pad, GstTagList * tag_list);
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void gst_message_parse_tag (GstMessage *message, GstTagList **tag_list);
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void gst_message_parse_tag_full (GstMessage *message, GstPad **pad, GstTagList **tag_list);
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/* BUFFERING */
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GstMessage * gst_message_new_buffering (GstObject * src, gint percent);
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void gst_message_parse_buffering (GstMessage *message, gint *percent);
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void gst_message_set_buffering_stats (GstMessage *message, GstBufferingMode mode,
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gint avg_in, gint avg_out,
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gint64 buffering_left);
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void gst_message_parse_buffering_stats (GstMessage *message, GstBufferingMode *mode,
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gint *avg_in, gint *avg_out,
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gint64 *buffering_left);
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/* STATE_CHANGED */
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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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void gst_message_parse_state_changed (GstMessage *message, GstState *oldstate,
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GstState *newstate, GstState *pending);
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/* STATE_DIRTY */
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GstMessage * gst_message_new_state_dirty (GstObject * src);
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/* STEP_DONE */
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GstMessage * gst_message_new_step_done (GstObject * src, GstFormat format, guint64 amount,
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gdouble rate, gboolean flush, gboolean intermediate,
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guint64 duration, gboolean eos);
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void gst_message_parse_step_done (GstMessage * message, GstFormat *format, guint64 *amount,
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gdouble *rate, gboolean *flush, gboolean *intermediate,
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guint64 *duration, gboolean *eos);
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/* CLOCK_PROVIDE */
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GstMessage * gst_message_new_clock_provide (GstObject * src, GstClock *clock, gboolean ready);
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void gst_message_parse_clock_provide (GstMessage *message, GstClock **clock,
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gboolean *ready);
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/* CLOCK_LOST */
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GstMessage * gst_message_new_clock_lost (GstObject * src, GstClock *clock);
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void gst_message_parse_clock_lost (GstMessage *message, GstClock **clock);
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/* NEW_CLOCK */
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GstMessage * gst_message_new_new_clock (GstObject * src, GstClock *clock);
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void gst_message_parse_new_clock (GstMessage *message, GstClock **clock);
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/* APPLICATION */
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GstMessage * gst_message_new_application (GstObject * src, GstStructure * structure);
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/* ELEMENT */
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GstMessage * gst_message_new_element (GstObject * src, GstStructure * structure);
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/* SEGMENT_START */
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GstMessage * gst_message_new_segment_start (GstObject * src, GstFormat format, gint64 position);
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void gst_message_parse_segment_start (GstMessage *message, GstFormat *format,
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gint64 *position);
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/* SEGMENT_DONE */
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GstMessage * gst_message_new_segment_done (GstObject * src, GstFormat format, gint64 position);
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void gst_message_parse_segment_done (GstMessage *message, GstFormat *format,
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gint64 *position);
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/* DURATION */
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GstMessage * gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration);
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void gst_message_parse_duration (GstMessage *message, GstFormat *format,
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gint64 *duration);
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/* LATENCY */
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GstMessage * gst_message_new_latency (GstObject * src);
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/* ASYNC_START */
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GstMessage * gst_message_new_async_start (GstObject * src, gboolean new_base_time);
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void gst_message_parse_async_start (GstMessage *message, gboolean *new_base_time);
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/* ASYNC_DONE */
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GstMessage * gst_message_new_async_done (GstObject * src);
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/* STRUCTURE CHANGE */
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GstMessage * gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
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GstElement *owner, gboolean busy);
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void gst_message_parse_structure_change (GstMessage *message, GstStructureChangeType *type,
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GstElement **owner, gboolean *busy);
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/* STREAM STATUS */
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GstMessage * gst_message_new_stream_status (GstObject * src, GstStreamStatusType type,
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GstElement *owner);
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void gst_message_parse_stream_status (GstMessage *message, GstStreamStatusType *type,
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GstElement **owner);
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void gst_message_set_stream_status_object (GstMessage *message, const GValue *object);
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const GValue * gst_message_get_stream_status_object (GstMessage *message);
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/* REQUEST_STATE */
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GstMessage * gst_message_new_request_state (GstObject * src, GstState state);
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void gst_message_parse_request_state (GstMessage * message, GstState *state);
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/* STEP_START */
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GstMessage * gst_message_new_step_start (GstObject * src, gboolean active, GstFormat format,
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guint64 amount, gdouble rate, gboolean flush,
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gboolean intermediate);
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void gst_message_parse_step_start (GstMessage * message, gboolean *active, GstFormat *format,
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guint64 *amount, gdouble *rate, gboolean *flush,
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gboolean *intermediate);
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/* custom messages */
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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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const GstStructure * gst_message_get_structure (GstMessage *message);
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G_END_DECLS
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#endif /* __GST_MESSAGE_H__ */
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