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484 lines
19 KiB
C
484 lines
19 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.. 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_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(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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* 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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* 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 (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 (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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