/* GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
*
* gstmessage.c: GstMessage subsystem
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstmessage
* @short_description: Lightweight objects to signal the application of
* pipeline events
* @see_also: #GstBus, #GstMiniObject, #GstElement
*
* Messages are implemented as a subclass of #GstMiniObject with a generic
* #GstStructure as the content. This allows for writing custom messages without
* requiring an API change while allowing a wide range of different types
* of messages.
*
* Messages are posted by objects in the pipeline and are passed to the
* application using the #GstBus.
* The basic use pattern of posting a message on a #GstBus is as follows:
*
* <example>
* <title>Posting a #GstMessage</title>
* <programlisting>
* gst_bus_post (bus, gst_message_new_eos());
* </programlisting>
* </example>
*
* A #GstElement usually posts messages on the bus provided by the parent
* container using gst_element_post_message().
*
* Last reviewed on 2005-11-09 (0.9.4)
*/
#include "gst_private.h"
#include <string.h> /* memcpy */
#include "gsterror.h"
#include "gstenumtypes.h"
#include "gstinfo.h"
#include "gstmessage.h"
#include "gsttaglist.h"
#include "gstutils.h"
#ifdef __SYMBIAN32__
#include <glib_global.h>
#endif
static void gst_message_init (GTypeInstance * instance, gpointer g_class);
static void gst_message_class_init (gpointer g_class, gpointer class_data);
static void gst_message_finalize (GstMessage * message);
static GstMessage *_gst_message_copy (GstMessage * message);
static GstMiniObjectClass *parent_class = NULL;
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
_gst_message_initialize (void)
{
GST_CAT_INFO (GST_CAT_GST_INIT, "init messages");
/* the GstMiniObject types need to be class_ref'd once before it can be
* done from multiple threads;
* see http://bugzilla.gnome.org/show_bug.cgi?id=304551 */
g_type_class_ref (gst_message_get_type ());
}
typedef struct
{
const gint type;
const gchar *name;
GQuark quark;
} GstMessageQuarks;
static GstMessageQuarks message_quarks[] = {
{GST_MESSAGE_UNKNOWN, "unknown", 0},
{GST_MESSAGE_EOS, "eos", 0},
{GST_MESSAGE_ERROR, "error", 0},
{GST_MESSAGE_WARNING, "warning", 0},
{GST_MESSAGE_INFO, "info", 0},
{GST_MESSAGE_TAG, "tag", 0},
{GST_MESSAGE_BUFFERING, "buffering", 0},
{GST_MESSAGE_STATE_CHANGED, "state-changed", 0},
{GST_MESSAGE_STATE_DIRTY, "state-dirty", 0},
{GST_MESSAGE_STEP_DONE, "step-done", 0},
{GST_MESSAGE_CLOCK_PROVIDE, "clock-provide", 0},
{GST_MESSAGE_CLOCK_LOST, "clock-lost", 0},
{GST_MESSAGE_NEW_CLOCK, "new-clock", 0},
{GST_MESSAGE_STRUCTURE_CHANGE, "structure-change", 0},
{GST_MESSAGE_STREAM_STATUS, "stream-status", 0},
{GST_MESSAGE_APPLICATION, "application", 0},
{GST_MESSAGE_ELEMENT, "element", 0},
{GST_MESSAGE_SEGMENT_START, "segment-start", 0},
{GST_MESSAGE_SEGMENT_DONE, "segment-done", 0},
{GST_MESSAGE_DURATION, "duration", 0},
{GST_MESSAGE_LATENCY, "latency", 0},
{GST_MESSAGE_ASYNC_START, "async-start", 0},
{GST_MESSAGE_ASYNC_DONE, "async-done", 0},
{0, NULL, 0}
};
/**
* gst_message_type_get_name:
* @type: the message type
*
* Get a printable name for the given message type. Do not modify or free.
*
* Returns: a reference to the static name of the message.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
const gchar *
gst_message_type_get_name (GstMessageType type)
{
gint i;
for (i = 0; message_quarks[i].name; i++) {
if (type == message_quarks[i].type)
return message_quarks[i].name;
}
return "unknown";
}
/**
* gst_message_type_to_quark:
* @type: the message type
*
* Get the unique quark for the given message type.
*
* Returns: the quark associated with the message type
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GQuark
gst_message_type_to_quark (GstMessageType type)
{
gint i;
for (i = 0; message_quarks[i].name; i++) {
if (type == message_quarks[i].type)
return message_quarks[i].quark;
}
return 0;
}
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GType
gst_message_get_type (void)
{
static GType _gst_message_type;
if (G_UNLIKELY (_gst_message_type == 0)) {
gint i;
static const GTypeInfo message_info = {
sizeof (GstMessageClass),
NULL,
NULL,
gst_message_class_init,
NULL,
NULL,
sizeof (GstMessage),
0,
gst_message_init,
NULL
};
_gst_message_type = g_type_register_static (GST_TYPE_MINI_OBJECT,
"GstMessage", &message_info, 0);
for (i = 0; message_quarks[i].name; i++) {
message_quarks[i].quark =
g_quark_from_static_string (message_quarks[i].name);
}
}
return _gst_message_type;
}
static void
gst_message_class_init (gpointer g_class, gpointer class_data)
{
GstMessageClass *message_class = GST_MESSAGE_CLASS (g_class);
parent_class = g_type_class_peek_parent (g_class);
message_class->mini_object_class.copy =
(GstMiniObjectCopyFunction) _gst_message_copy;
message_class->mini_object_class.finalize =
(GstMiniObjectFinalizeFunction) gst_message_finalize;
}
static void
gst_message_init (GTypeInstance * instance, gpointer g_class)
{
GstMessage *message = GST_MESSAGE (instance);
GST_CAT_LOG (GST_CAT_MESSAGE, "new message %p", message);
GST_MESSAGE_TIMESTAMP (message) = GST_CLOCK_TIME_NONE;
}
static void
gst_message_finalize (GstMessage * message)
{
g_return_if_fail (message != NULL);
GST_CAT_LOG (GST_CAT_MESSAGE, "finalize message %p", message);
if (GST_MESSAGE_SRC (message)) {
gst_object_unref (GST_MESSAGE_SRC (message));
GST_MESSAGE_SRC (message) = NULL;
}
if (message->lock) {
GST_MESSAGE_LOCK (message);
GST_MESSAGE_SIGNAL (message);
GST_MESSAGE_UNLOCK (message);
}
if (message->structure) {
gst_structure_set_parent_refcount (message->structure, NULL);
gst_structure_free (message->structure);
}
GST_MINI_OBJECT_CLASS (parent_class)->finalize (GST_MINI_OBJECT (message));
}
static GstMessage *
_gst_message_copy (GstMessage * message)
{
GstMessage *copy;
GST_CAT_LOG (GST_CAT_MESSAGE, "copy message %p", message);
copy = (GstMessage *) gst_mini_object_new (GST_TYPE_MESSAGE);
/* FIXME, need to copy relevant data from the miniobject. */
//memcpy (copy, message, sizeof (GstMessage));
GST_MESSAGE_GET_LOCK (copy) = GST_MESSAGE_GET_LOCK (message);
GST_MESSAGE_COND (copy) = GST_MESSAGE_COND (message);
GST_MESSAGE_TYPE (copy) = GST_MESSAGE_TYPE (message);
GST_MESSAGE_TIMESTAMP (copy) = GST_MESSAGE_TIMESTAMP (message);
if (GST_MESSAGE_SRC (message)) {
GST_MESSAGE_SRC (copy) = gst_object_ref (GST_MESSAGE_SRC (message));
}
if (message->structure) {
copy->structure = gst_structure_copy (message->structure);
gst_structure_set_parent_refcount (copy->structure,
©->mini_object.refcount);
}
return copy;
}
/**
* gst_message_new_custom:
* @type: The #GstMessageType to distinguish messages
* @src: The object originating the message.
* @structure: The structure for the message. The message will take ownership of
* the structure.
*
* Create a new custom-typed message. This can be used for anything not
* handled by other message-specific functions to pass a message to the
* app. The structure field can be NULL.
*
* Returns: The new message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_custom (GstMessageType type, GstObject * src,
GstStructure * structure)
{
GstMessage *message;
message = (GstMessage *) gst_mini_object_new (GST_TYPE_MESSAGE);
GST_CAT_LOG (GST_CAT_MESSAGE, "source %s: creating new message %p %s",
(src ? GST_OBJECT_NAME (src) : "NULL"), message,
gst_message_type_get_name (type));
message->type = type;
if (src)
gst_object_ref (src);
message->src = src;
if (structure) {
gst_structure_set_parent_refcount (structure,
&message->mini_object.refcount);
}
message->structure = structure;
return message;
}
/**
* gst_message_new_eos:
* @src: The object originating the message.
*
* Create a new eos message. This message is generated and posted in
* the sink elements of a GstBin. The bin will only forward the EOS
* message to the application if all sinks have posted an EOS message.
*
* Returns: The new eos message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_eos (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_EOS, src, NULL);
return message;
}
/**
* gst_message_new_error:
* @src: The object originating the message.
* @error: The GError for this message.
* @debug: A debugging string for something or other.
*
* Create a new error message. The message will copy @error and
* @debug. This message is posted by element when a fatal event
* occured. The pipeline will probably (partially) stop. The application
* receiving this message should stop the pipeline.
*
* Returns: The new error message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_error (GstObject * src, GError * error, gchar * debug)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_ERROR, src,
gst_structure_new ("GstMessageError", "gerror", GST_TYPE_G_ERROR, error,
"debug", G_TYPE_STRING, debug, NULL));
return message;
}
/**
* gst_message_new_warning:
* @src: The object originating the message.
* @error: The GError for this message.
* @debug: A debugging string for something or other.
*
* Create a new warning message. The message will make copies of @error and
* @debug.
*
* Returns: The new warning message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_warning (GstObject * src, GError * error, gchar * debug)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_WARNING, src,
gst_structure_new ("GstMessageWarning", "gerror", GST_TYPE_G_ERROR, error,
"debug", G_TYPE_STRING, debug, NULL));
return message;
}
/**
* gst_message_new_info:
* @src: The object originating the message.
* @error: The GError for this message.
* @debug: A debugging string for something or other.
*
* Create a new info message. The message will make copies of @error and
* @debug.
*
* Returns: The new info message.
*
* Since: 0.10.12
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_info (GstObject * src, GError * error, gchar * debug)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_INFO, src,
gst_structure_new ("GstMessageInfo", "gerror", GST_TYPE_G_ERROR, error,
"debug", G_TYPE_STRING, debug, NULL));
return message;
}
/**
* gst_message_new_tag:
* @src: The object originating the message.
* @tag_list: The tag list for the message.
*
* Create a new tag message. The message will take ownership of the tag list.
* The message is posted by elements that discovered a new taglist.
*
* Returns: The new tag message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_tag (GstObject * src, GstTagList * tag_list)
{
GstMessage *message;
g_return_val_if_fail (GST_IS_STRUCTURE (tag_list), NULL);
message =
gst_message_new_custom (GST_MESSAGE_TAG, src, (GstStructure *) tag_list);
return message;
}
/**
* gst_message_new_buffering:
* @src: The object originating the message.
* @percent: The buffering percent
*
* Create a new buffering message. This message can be posted by an element that
* needs to buffer data before it can continue processing. @percent should be a
* value between 0 and 100. A value of 100 means that the buffering completed.
*
* When @percent is < 100 the application should PAUSE a PLAYING pipeline. When
* @percent is 100, the application can set the pipeline (back) to PLAYING.
* The application must be prepared to receive BUFFERING messages in the
* PREROLLING state and may only set the pipeline to PLAYING after receiving a
* message with @percent set to 100, which can happen after the pipeline
* completed prerolling.
*
* Returns: The new buffering message.
*
* Since: 0.10.11
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_buffering (GstObject * src, gint percent)
{
GstMessage *message;
g_return_val_if_fail (percent >= 0 && percent <= 100, NULL);
message = gst_message_new_custom (GST_MESSAGE_BUFFERING, src,
gst_structure_new ("GstMessageBuffering",
"buffer-percent", G_TYPE_INT, percent, NULL));
return message;
}
/**
* gst_message_new_state_changed:
* @src: the object originating the message
* @oldstate: the previous state
* @newstate: the new (current) state
* @pending: the pending (target) state
*
* Create a state change message. This message is posted whenever an element
* changed its state.
*
* Returns: The new state change message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_state_changed (GstObject * src,
GstState oldstate, GstState newstate, GstState pending)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_STATE_CHANGED, src,
gst_structure_new ("GstMessageState",
"old-state", GST_TYPE_STATE, (gint) oldstate,
"new-state", GST_TYPE_STATE, (gint) newstate,
"pending-state", GST_TYPE_STATE, (gint) pending, NULL));
return message;
}
/**
* gst_message_new_state_dirty:
* @src: the object originating the message
*
* Create a state dirty message. This message is posted whenever an element
* changed its state asynchronously and is used internally to update the
* states of container objects.
*
* Returns: The new state dirty message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_state_dirty (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_STATE_DIRTY, src, NULL);
return message;
}
/**
* gst_message_new_clock_provide:
* @src: The object originating the message.
* @clock: The clock it provides
* @ready: TRUE if the sender can provide a clock
*
* Create a clock provide message. This message is posted whenever an
* element is ready to provide a clock or lost its ability to provide
* a clock (maybe because it paused or became EOS).
*
* This message is mainly used internally to manage the clock
* selection.
*
* Returns: The new provide clock message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_clock_provide (GstObject * src, GstClock * clock,
gboolean ready)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_CLOCK_PROVIDE, src,
gst_structure_new ("GstMessageClockProvide",
"clock", GST_TYPE_CLOCK, clock,
"ready", G_TYPE_BOOLEAN, ready, NULL));
return message;
}
/**
* gst_message_new_clock_lost:
* @src: The object originating the message.
* @clock: the clock that was lost
*
* Create a clock lost message. This message is posted whenever the
* clock is not valid anymore.
*
* If this message is posted by the pipeline, the pipeline will
* select a new clock again when it goes to PLAYING. It might therefore
* be needed to set the pipeline to PAUSED and PLAYING again.
*
* Returns: The new clock lost message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_clock_lost (GstObject * src, GstClock * clock)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_CLOCK_LOST, src,
gst_structure_new ("GstMessageClockLost",
"clock", GST_TYPE_CLOCK, clock, NULL));
return message;
}
/**
* gst_message_new_new_clock:
* @src: The object originating the message.
* @clock: the new selected clock
*
* Create a new clock message. This message is posted whenever the
* pipeline selectes a new clock for the pipeline.
*
* Returns: The new new clock message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_new_clock (GstObject * src, GstClock * clock)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_NEW_CLOCK, src,
gst_structure_new ("GstMessageNewClock",
"clock", GST_TYPE_CLOCK, clock, NULL));
return message;
}
/**
* gst_message_new_segment_start:
* @src: The object originating the message.
* @format: The format of the position being played
* @position: The position of the segment being played
*
* Create a new segment message. This message is posted by elements that
* start playback of a segment as a result of a segment seek. This message
* is not received by the application but is used for maintenance reasons in
* container elements.
*
* Returns: The new segment start message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_segment_start (GstObject * src, GstFormat format,
gint64 position)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_SEGMENT_START, src,
gst_structure_new ("GstMessageSegmentStart",
"format", GST_TYPE_FORMAT, format,
"position", G_TYPE_INT64, position, NULL));
return message;
}
/**
* gst_message_new_segment_done:
* @src: The object originating the message.
* @format: The format of the position being done
* @position: The position of the segment being done
*
* Create a new segment done message. This message is posted by elements that
* finish playback of a segment as a result of a segment seek. This message
* is received by the application after all elements that posted a segment_start
* have posted the segment_done.
*
* Returns: The new segment done message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_segment_done (GstObject * src, GstFormat format,
gint64 position)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_SEGMENT_DONE, src,
gst_structure_new ("GstMessageSegmentDone",
"format", GST_TYPE_FORMAT, format,
"position", G_TYPE_INT64, position, NULL));
return message;
}
/**
* gst_message_new_application:
* @src: The object originating the message.
* @structure: The structure for the message. The message will take ownership of
* the structure.
*
* Create a new application-typed message. GStreamer will never create these
* messages; they are a gift from us to you. Enjoy.
*
* Returns: The new application message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_application (GstObject * src, GstStructure * structure)
{
return gst_message_new_custom (GST_MESSAGE_APPLICATION, src, structure);
}
/**
* gst_message_new_element:
* @src: The object originating the message.
* @structure: The structure for the message. The message will take ownership of
* the structure.
*
* Create a new element-specific message. This is meant as a generic way of
* allowing one-way communication from an element to an application, for example
* "the firewire cable was unplugged". The format of the message should be
* documented in the element's documentation. The structure field can be NULL.
*
* Returns: The new element message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_element (GstObject * src, GstStructure * structure)
{
return gst_message_new_custom (GST_MESSAGE_ELEMENT, src, structure);
}
/**
* gst_message_new_duration:
* @src: The object originating the message.
* @format: The format of the duration
* @duration: The new duration
*
* Create a new duration message. This message is posted by elements that
* know the duration of a stream in a specific format. This message
* is received by bins and is used to calculate the total duration of a
* pipeline. Elements may post a duration message with a duration of
* GST_CLOCK_TIME_NONE to indicate that the duration has changed and the
* cached duration should be discarded. The new duration can then be
* retrieved via a query.
*
* Returns: The new duration message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_duration (GstObject * src, GstFormat format, gint64 duration)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_DURATION, src,
gst_structure_new ("GstMessageDuration",
"format", GST_TYPE_FORMAT, format,
"duration", G_TYPE_INT64, duration, NULL));
return message;
}
/**
* gst_message_new_async_start:
* @src: The object originating the message.
* @new_base_time: if a new base_time should be set on the element
*
* This message is posted by elements when they start an ASYNC state change.
* @new_base_time is set to TRUE when the element lost its state when it was
* PLAYING.
*
* Returns: The new async_start message.
*
* MT safe.
*
* Since: 0.10.13
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_async_start (GstObject * src, gboolean new_base_time)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_ASYNC_START, src,
gst_structure_new ("GstMessageAsyncStart",
"new-base-time", G_TYPE_BOOLEAN, new_base_time, NULL));
return message;
}
/**
* gst_message_new_async_done:
* @src: The object originating the message.
*
* The message is posted when elements completed an ASYNC state change.
*
* Returns: The new async_done message.
*
* MT safe.
*
* Since: 0.10.13
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_async_done (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_ASYNC_DONE, src, NULL);
return message;
}
/**
* gst_message_new_latency:
* @src: The object originating the message.
*
* This message can be posted by elements when their latency requirements have
* changed.
*
* Returns: The new latency message.
*
* MT safe.
*
* Since: 0.10.12
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstMessage *
gst_message_new_latency (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_LATENCY, src, NULL);
return message;
}
/**
* gst_message_get_structure:
* @message: The #GstMessage.
*
* Access the structure of the message.
*
* Returns: The structure of the message. The structure is still
* owned by the message, which means that you should not free it and
* that the pointer becomes invalid when you free the message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
const GstStructure *
gst_message_get_structure (GstMessage * message)
{
g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
return message->structure;
}
/**
* gst_message_parse_tag:
* @message: A valid #GstMessage of type GST_MESSAGE_TAG.
* @tag_list: Return location for the tag-list.
*
* Extracts the tag list from the GstMessage. The tag list returned in the
* output argument is a copy; the caller must free it when done.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_tag (GstMessage * message, GstTagList ** tag_list)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TAG);
g_return_if_fail (tag_list != NULL);
*tag_list = (GstTagList *) gst_structure_copy (message->structure);
}
/**
* gst_message_parse_buffering:
* @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
* @percent: Return location for the percent.
*
* Extracts the buffering percent from the GstMessage. see also
* gst_message_new_buffering().
*
* Since: 0.10.11
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_buffering (GstMessage * message, gint * percent)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);
if (percent)
gst_structure_get_int (message->structure, "buffer-percent", percent);
}
/**
* gst_message_parse_state_changed:
* @message: a valid #GstMessage of type GST_MESSAGE_STATE_CHANGED
* @oldstate: the previous state, or NULL
* @newstate: the new (current) state, or NULL
* @pending: the pending (target) state, or NULL
*
* Extracts the old and new states from the GstMessage.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_state_changed (GstMessage * message,
GstState * oldstate, GstState * newstate, GstState * pending)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STATE_CHANGED);
if (oldstate)
gst_structure_get_enum (message->structure, "old-state",
GST_TYPE_STATE, (gint *) oldstate);
if (newstate)
gst_structure_get_enum (message->structure, "new-state",
GST_TYPE_STATE, (gint *) newstate);
if (pending)
gst_structure_get_enum (message->structure, "pending-state",
GST_TYPE_STATE, (gint *) pending);
}
/**
* gst_message_parse_clock_provide:
* @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_PROVIDE.
* @clock: A pointer to hold a clock object.
* @ready: A pointer to hold the ready flag.
*
* Extracts the clock and ready flag from the GstMessage.
* The clock object returned remains valid until the message is freed.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_clock_provide (GstMessage * message, GstClock ** clock,
gboolean * ready)
{
const GValue *clock_gvalue;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_PROVIDE);
clock_gvalue = gst_structure_get_value (message->structure, "clock");
g_return_if_fail (clock_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
if (ready)
gst_structure_get_boolean (message->structure, "ready", ready);
if (clock)
*clock = (GstClock *) g_value_get_object (clock_gvalue);
}
/**
* gst_message_parse_clock_lost:
* @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_LOST.
* @clock: A pointer to hold the lost clock
*
* Extracts the lost clock from the GstMessage.
* The clock object returned remains valid until the message is freed.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_clock_lost (GstMessage * message, GstClock ** clock)
{
const GValue *clock_gvalue;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_LOST);
clock_gvalue = gst_structure_get_value (message->structure, "clock");
g_return_if_fail (clock_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
if (clock)
*clock = (GstClock *) g_value_get_object (clock_gvalue);
}
/**
* gst_message_parse_new_clock:
* @message: A valid #GstMessage of type GST_MESSAGE_NEW_CLOCK.
* @clock: A pointer to hold the selected new clock
*
* Extracts the new clock from the GstMessage.
* The clock object returned remains valid until the message is freed.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_new_clock (GstMessage * message, GstClock ** clock)
{
const GValue *clock_gvalue;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEW_CLOCK);
clock_gvalue = gst_structure_get_value (message->structure, "clock");
g_return_if_fail (clock_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
if (clock)
*clock = (GstClock *) g_value_get_object (clock_gvalue);
}
/**
* gst_message_parse_error:
* @message: A valid #GstMessage of type GST_MESSAGE_ERROR.
* @gerror: Location for the GError
* @debug: Location for the debug message, or NULL
*
* Extracts the GError and debug string from the GstMessage. The values returned
* in the output arguments are copies; the caller must free them when done.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_error (GstMessage * message, GError ** gerror, gchar ** debug)
{
const GValue *error_gvalue;
GError *error_val;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR);
error_gvalue = gst_structure_get_value (message->structure, "gerror");
g_return_if_fail (error_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (error_gvalue) == GST_TYPE_G_ERROR);
error_val = (GError *) g_value_get_boxed (error_gvalue);
if (error_val)
*gerror = g_error_copy (error_val);
else
*gerror = NULL;
if (debug)
*debug = g_strdup (gst_structure_get_string (message->structure, "debug"));
}
/**
* gst_message_parse_warning:
* @message: A valid #GstMessage of type GST_MESSAGE_WARNING.
* @gerror: Location for the GError
* @debug: Location for the debug message, or NULL
*
* Extracts the GError and debug string from the GstMessage. The values returned
* in the output arguments are copies; the caller must free them when done.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_warning (GstMessage * message, GError ** gerror,
gchar ** debug)
{
const GValue *error_gvalue;
GError *error_val;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING);
error_gvalue = gst_structure_get_value (message->structure, "gerror");
g_return_if_fail (error_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (error_gvalue) == GST_TYPE_G_ERROR);
error_val = (GError *) g_value_get_boxed (error_gvalue);
if (error_val)
*gerror = g_error_copy (error_val);
else
*gerror = NULL;
if (debug)
*debug = g_strdup (gst_structure_get_string (message->structure, "debug"));
}
/**
* gst_message_parse_info:
* @message: A valid #GstMessage of type GST_MESSAGE_INFO.
* @gerror: Location for the GError
* @debug: Location for the debug message, or NULL
*
* Extracts the GError and debug string from the GstMessage. The values returned
* in the output arguments are copies; the caller must free them when done.
*
* MT safe.
*
* Since: 0.10.12
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_info (GstMessage * message, GError ** gerror, gchar ** debug)
{
const GValue *error_gvalue;
GError *error_val;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_INFO);
error_gvalue = gst_structure_get_value (message->structure, "gerror");
g_return_if_fail (error_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (error_gvalue) == GST_TYPE_G_ERROR);
error_val = (GError *) g_value_get_boxed (error_gvalue);
if (error_val)
*gerror = g_error_copy (error_val);
else
*gerror = NULL;
if (debug)
*debug = g_strdup (gst_structure_get_string (message->structure, "debug"));
}
/**
* gst_message_parse_segment_start:
* @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_START.
* @format: Result location for the format, or NULL
* @position: Result location for the position, or NULL
*
* Extracts the position and format from the segment start message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_segment_start (GstMessage * message, GstFormat * format,
gint64 * position)
{
const GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_SEGMENT_START);
structure = gst_message_get_structure (message);
if (format)
*format = g_value_get_enum (gst_structure_get_value (structure, "format"));
if (position)
*position =
g_value_get_int64 (gst_structure_get_value (structure, "position"));
}
/**
* gst_message_parse_segment_done:
* @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_DONE.
* @format: Result location for the format, or NULL
* @position: Result location for the position, or NULL
*
* Extracts the position and format from the segment start message.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_segment_done (GstMessage * message, GstFormat * format,
gint64 * position)
{
const GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_SEGMENT_DONE);
structure = gst_message_get_structure (message);
if (format)
*format = g_value_get_enum (gst_structure_get_value (structure, "format"));
if (position)
*position =
g_value_get_int64 (gst_structure_get_value (structure, "position"));
}
/**
* gst_message_parse_duration:
* @message: A valid #GstMessage of type GST_MESSAGE_DURATION.
* @format: Result location for the format, or NULL
* @duration: Result location for the duration, or NULL
*
* Extracts the duration and format from the duration message. The duration
* might be GST_CLOCK_TIME_NONE, which indicates that the duration has
* changed. Applications should always use a query to retrieve the duration
* of a pipeline.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_duration (GstMessage * message, GstFormat * format,
gint64 * duration)
{
const GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_DURATION);
structure = gst_message_get_structure (message);
if (format)
*format = g_value_get_enum (gst_structure_get_value (structure, "format"));
if (duration)
*duration =
g_value_get_int64 (gst_structure_get_value (structure, "duration"));
}
/**
* gst_message_parse_async_start:
* @message: A valid #GstMessage of type GST_MESSAGE_ASYNC_DONE.
* @new_base_time: Result location for the new_base_time or NULL
*
* Extract the new_base_time from the async_start message.
*
* MT safe.
*
* Since: 0.10.13
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
gst_message_parse_async_start (GstMessage * message, gboolean * new_base_time)
{
const GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ASYNC_START);
structure = gst_message_get_structure (message);
if (new_base_time)
*new_base_time =
g_value_get_boolean (gst_structure_get_value (structure,
"new-base-time"));
}