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gstreamer/gst/gstmessage.c
Thibault Saunier 97aa82387f device-provider: Allow notifying application of device changes 
Thi introduces new APIs to post a `DEVICE_CHANGED` message on the
bus so the application is notifies when a device is modified. For
example, if the "defaultness" of a device was changed or any property
that can be changed at any time. Atomically changing the device
object notifying that way allow us to abtract away the internal threads.

New APIS:
  - gst_message_new_device_changed
  - gst_message_parse_device_changed
  - gst_device_provider_device_changed
2019-02-08 13:44:02 -03:00

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/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstmessage
* @title: 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:
* |[<!-- language="C" -->
* gst_bus_post (bus, gst_message_new_eos());
* ]|
*
* A #GstElement usually posts messages on the bus provided by the parent
* container using gst_element_post_message().
*/
#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"
#include "gstquark.h"
#include "gstvalue.h"
typedef struct
{
GstMessage message;
GstStructure *structure;
} GstMessageImpl;
#define GST_MESSAGE_STRUCTURE(m) (((GstMessageImpl *)(m))->structure)
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_CHANGED, "duration-changed", 0},
{GST_MESSAGE_LATENCY, "latency", 0},
{GST_MESSAGE_ASYNC_START, "async-start", 0},
{GST_MESSAGE_ASYNC_DONE, "async-done", 0},
{GST_MESSAGE_REQUEST_STATE, "request-state", 0},
{GST_MESSAGE_STEP_START, "step-start", 0},
{GST_MESSAGE_QOS, "qos", 0},
{GST_MESSAGE_PROGRESS, "progress", 0},
{GST_MESSAGE_TOC, "toc", 0},
{GST_MESSAGE_RESET_TIME, "reset-time", 0},
{GST_MESSAGE_STREAM_START, "stream-start", 0},
{GST_MESSAGE_NEED_CONTEXT, "need-context", 0},
{GST_MESSAGE_HAVE_CONTEXT, "have-context", 0},
{GST_MESSAGE_DEVICE_ADDED, "device-added", 0},
{GST_MESSAGE_DEVICE_REMOVED, "device-removed", 0},
{GST_MESSAGE_DEVICE_CHANGED, "device-changed", 0},
{GST_MESSAGE_PROPERTY_NOTIFY, "property-notify", 0},
{GST_MESSAGE_STREAM_COLLECTION, "stream-collection", 0},
{GST_MESSAGE_STREAMS_SELECTED, "streams-selected", 0},
{GST_MESSAGE_REDIRECT, "redirect", 0},
{0, NULL, 0}
};
static GQuark details_quark = 0;
GType _gst_message_type = 0;
GST_DEFINE_MINI_OBJECT_TYPE (GstMessage, gst_message);
void
_priv_gst_message_initialize (void)
{
gint i;
GST_CAT_INFO (GST_CAT_GST_INIT, "init messages");
for (i = 0; message_quarks[i].name; i++) {
message_quarks[i].quark =
g_quark_from_static_string (message_quarks[i].name);
}
details_quark = g_quark_from_static_string ("details");
_gst_message_type = gst_message_get_type ();
}
/**
* 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.
*/
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
*/
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;
}
static gboolean
_gst_message_dispose (GstMessage * message)
{
gboolean do_free = TRUE;
if (GST_MINI_OBJECT_FLAG_IS_SET (message, GST_MESSAGE_FLAG_ASYNC_DELIVERY)) {
/* revive message, so bus can finish with it and clean it up */
gst_message_ref (message);
GST_INFO ("[msg %p] signalling async free", message);
GST_MESSAGE_LOCK (message);
GST_MESSAGE_SIGNAL (message);
GST_MESSAGE_UNLOCK (message);
/* don't free it yet, let bus finish with it first */
do_free = FALSE;
}
return do_free;
}
static void
_gst_message_free (GstMessage * message)
{
GstStructure *structure;
g_return_if_fail (message != NULL);
GST_CAT_LOG (GST_CAT_MESSAGE, "finalize message %p, %s from %s", message,
GST_MESSAGE_TYPE_NAME (message), GST_MESSAGE_SRC_NAME (message));
if (GST_MESSAGE_SRC (message)) {
gst_object_unref (GST_MESSAGE_SRC (message));
GST_MESSAGE_SRC (message) = NULL;
}
structure = GST_MESSAGE_STRUCTURE (message);
if (structure) {
gst_structure_set_parent_refcount (structure, NULL);
gst_structure_free (structure);
}
#ifdef USE_POISONING
memset (message, 0xff, sizeof (GstMessageImpl));
#endif
g_slice_free1 (sizeof (GstMessageImpl), message);
}
static void
gst_message_init (GstMessageImpl * message, GstMessageType type,
GstObject * src);
static GstMessage *
_gst_message_copy (GstMessage * message)
{
GstMessageImpl *copy;
GstStructure *structure;
GST_CAT_LOG (GST_CAT_MESSAGE, "copy message %p, %s from %s", message,
GST_MESSAGE_TYPE_NAME (message),
GST_OBJECT_NAME (GST_MESSAGE_SRC (message)));
copy = g_slice_new0 (GstMessageImpl);
gst_message_init (copy, GST_MESSAGE_TYPE (message),
GST_MESSAGE_SRC (message));
GST_MESSAGE_TIMESTAMP (copy) = GST_MESSAGE_TIMESTAMP (message);
GST_MESSAGE_SEQNUM (copy) = GST_MESSAGE_SEQNUM (message);
structure = GST_MESSAGE_STRUCTURE (message);
if (structure) {
GST_MESSAGE_STRUCTURE (copy) = gst_structure_copy (structure);
gst_structure_set_parent_refcount (GST_MESSAGE_STRUCTURE (copy),
&copy->message.mini_object.refcount);
} else {
GST_MESSAGE_STRUCTURE (copy) = NULL;
}
return GST_MESSAGE_CAST (copy);
}
static void
gst_message_init (GstMessageImpl * message, GstMessageType type,
GstObject * src)
{
gst_mini_object_init (GST_MINI_OBJECT_CAST (message), 0, _gst_message_type,
(GstMiniObjectCopyFunction) _gst_message_copy,
(GstMiniObjectDisposeFunction) _gst_message_dispose,
(GstMiniObjectFreeFunction) _gst_message_free);
GST_MESSAGE_TYPE (message) = type;
if (src)
gst_object_ref (src);
GST_MESSAGE_SRC (message) = src;
GST_MESSAGE_TIMESTAMP (message) = GST_CLOCK_TIME_NONE;
GST_MESSAGE_SEQNUM (message) = gst_util_seqnum_next ();
}
/**
* gst_message_new_custom:
* @type: The #GstMessageType to distinguish messages
* @src: (transfer none) (allow-none): The object originating the message.
* @structure: (transfer full) (allow-none): 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: (transfer full) (nullable): The new message.
*
* MT safe.
*/
GstMessage *
gst_message_new_custom (GstMessageType type, GstObject * src,
GstStructure * structure)
{
GstMessageImpl *message;
message = g_slice_new0 (GstMessageImpl);
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));
if (structure) {
/* structure must not have a parent */
if (!gst_structure_set_parent_refcount (structure,
&message->message.mini_object.refcount))
goto had_parent;
}
gst_message_init (message, type, src);
GST_MESSAGE_STRUCTURE (message) = structure;
return GST_MESSAGE_CAST (message);
/* ERRORS */
had_parent:
{
g_slice_free1 (sizeof (GstMessageImpl), message);
g_warning ("structure is already owned by another object");
return NULL;
}
}
/**
* gst_message_get_seqnum:
* @message: A #GstMessage.
*
* Retrieve the sequence number of a message.
*
* Messages have ever-incrementing sequence numbers, which may also be set
* explicitly via gst_message_set_seqnum(). Sequence numbers are typically used
* to indicate that a message corresponds to some other set of messages or
* events, for example a SEGMENT_DONE message corresponding to a SEEK event. It
* is considered good practice to make this correspondence when possible, though
* it is not required.
*
* Note that events and messages share the same sequence number incrementor;
* two events or messages will never have the same sequence number unless
* that correspondence was made explicitly.
*
* Returns: The message's sequence number.
*
* MT safe.
*/
guint32
gst_message_get_seqnum (GstMessage * message)
{
g_return_val_if_fail (GST_IS_MESSAGE (message), -1);
return GST_MESSAGE_SEQNUM (message);
}
/**
* gst_message_set_seqnum:
* @message: A #GstMessage.
* @seqnum: A sequence number.
*
* Set the sequence number of a message.
*
* This function might be called by the creator of a message to indicate that
* the message relates to other messages or events. See gst_message_get_seqnum()
* for more information.
*
* MT safe.
*/
void
gst_message_set_seqnum (GstMessage * message, guint32 seqnum)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (seqnum != GST_SEQNUM_INVALID);
GST_MESSAGE_SEQNUM (message) = seqnum;
}
/**
* gst_message_new_eos:
* @src: (transfer none) (allow-none): 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: (transfer full): The new eos message.
*
* MT safe.
*/
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_with_details:
* @src: (transfer none) (allow-none): The object originating the message.
* @error: (transfer none): The GError for this message.
* @debug: A debugging string.
* @details: (transfer full): (allow-none): A GstStructure with details
*
* Create a new error message. The message will copy @error and
* @debug. This message is posted by element when a fatal event
* occurred. The pipeline will probably (partially) stop. The application
* receiving this message should stop the pipeline.
*
* Returns: (transfer full) (nullable): the new error message.
*
* Since: 1.10
*/
GstMessage *
gst_message_new_error_with_details (GstObject * src, GError * error,
const gchar * debug, GstStructure * details)
{
GstMessage *message;
GstStructure *structure;
if (debug && !g_utf8_validate (debug, -1, NULL)) {
debug = NULL;
g_warning ("Trying to set debug field of error message, but "
"string is not valid UTF-8. Please file a bug.");
}
structure = gst_structure_new_id (GST_QUARK (MESSAGE_ERROR),
GST_QUARK (GERROR), G_TYPE_ERROR, error,
GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
message = gst_message_new_custom (GST_MESSAGE_ERROR, src, structure);
if (details) {
GValue v = G_VALUE_INIT;
g_value_init (&v, GST_TYPE_STRUCTURE);
g_value_take_boxed (&v, details);
gst_structure_id_take_value (GST_MESSAGE_STRUCTURE (message), details_quark,
&v);
}
return message;
}
/**
* gst_message_new_error:
* @src: (transfer none) (allow-none): The object originating the message.
* @error: (transfer none): The GError for this message.
* @debug: A debugging string.
*
* Create a new error message. The message will copy @error and
* @debug. This message is posted by element when a fatal event
* occurred. The pipeline will probably (partially) stop. The application
* receiving this message should stop the pipeline.
*
* Returns: (transfer full): the new error message.
*
* MT safe.
*/
GstMessage *
gst_message_new_error (GstObject * src, GError * error, const gchar * debug)
{
return gst_message_new_error_with_details (src, error, debug, NULL);
}
/**
* gst_message_parse_error_details:
* @message: The message object
* @structure: (transfer none) (out): A pointer to the returned details
*
* Returns the optional details structure, may be NULL if none.
* The returned structure must not be freed.
*
* Since: 1.10
*/
void
gst_message_parse_error_details (GstMessage * message,
const GstStructure ** structure)
{
const GValue *v;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR);
g_return_if_fail (structure != NULL);
*structure = NULL;
v = gst_structure_id_get_value (GST_MESSAGE_STRUCTURE (message),
details_quark);
if (v) {
*structure = g_value_get_boxed (v);
}
}
/**
* gst_message_new_warning_with_details:
* @src: (transfer none) (allow-none): The object originating the message.
* @error: (transfer none): The GError for this message.
* @debug: A debugging string.
* @details: (transfer full): (allow-none): A GstStructure with details
*
* Create a new warning message. The message will make copies of @error and
* @debug.
*
* Returns: (transfer full) (nullable): the new warning message.
*
* Since: 1.10
*/
GstMessage *
gst_message_new_warning_with_details (GstObject * src, GError * error,
const gchar * debug, GstStructure * details)
{
GstMessage *message;
GstStructure *structure;
if (debug && !g_utf8_validate (debug, -1, NULL)) {
debug = NULL;
g_warning ("Trying to set debug field of warning message, but "
"string is not valid UTF-8. Please file a bug.");
}
structure = gst_structure_new_id (GST_QUARK (MESSAGE_WARNING),
GST_QUARK (GERROR), G_TYPE_ERROR, error,
GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
message = gst_message_new_custom (GST_MESSAGE_WARNING, src, structure);
if (details) {
GValue v = G_VALUE_INIT;
g_value_init (&v, GST_TYPE_STRUCTURE);
g_value_take_boxed (&v, details);
gst_structure_id_take_value (GST_MESSAGE_STRUCTURE (message), details_quark,
&v);
}
return message;
}
/**
* gst_message_new_warning:
* @src: (transfer none) (allow-none): The object originating the message.
* @error: (transfer none): The GError for this message.
* @debug: A debugging string.
*
* Create a new warning message. The message will make copies of @error and
* @debug.
*
* Returns: (transfer full): the new warning message.
*
* MT safe.
*/
GstMessage *
gst_message_new_warning (GstObject * src, GError * error, const gchar * debug)
{
return gst_message_new_warning_with_details (src, error, debug, NULL);
}
/**
* gst_message_parse_warning_details:
* @message: The message object
* @structure: (transfer none) (out): A pointer to the returned details structure
*
* Returns the optional details structure, may be NULL if none
* The returned structure must not be freed.
*
* Since: 1.10
*/
void
gst_message_parse_warning_details (GstMessage * message,
const GstStructure ** structure)
{
const GValue *v;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING);
g_return_if_fail (structure != NULL);
*structure = NULL;
v = gst_structure_id_get_value (GST_MESSAGE_STRUCTURE (message),
details_quark);
if (v) {
*structure = g_value_get_boxed (v);
}
}
/**
* gst_message_new_info_with_details:
* @src: (transfer none) (allow-none): The object originating the message.
* @error: (transfer none): The GError for this message.
* @debug: A debugging string.
* @details: (transfer full): (allow-none): A GstStructure with details
*
* Create a new info message. The message will make copies of @error and
* @debug.
*
* Returns: (transfer full) (nullable): the new warning message.
*
* Since: 1.10
*/
GstMessage *
gst_message_new_info_with_details (GstObject * src, GError * error,
const gchar * debug, GstStructure * details)
{
GstMessage *message;
GstStructure *structure;
if (debug && !g_utf8_validate (debug, -1, NULL)) {
debug = NULL;
g_warning ("Trying to set debug field of info message, but "
"string is not valid UTF-8. Please file a bug.");
}
structure = gst_structure_new_id (GST_QUARK (MESSAGE_INFO),
GST_QUARK (GERROR), G_TYPE_ERROR, error,
GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
message = gst_message_new_custom (GST_MESSAGE_INFO, src, structure);
if (details) {
GValue v = G_VALUE_INIT;
g_value_init (&v, GST_TYPE_STRUCTURE);
g_value_take_boxed (&v, details);
gst_structure_id_take_value (GST_MESSAGE_STRUCTURE (message), details_quark,
&v);
}
return message;
}
/**
* gst_message_new_info:
* @src: (transfer none) (allow-none): The object originating the message.
* @error: (transfer none): The GError for this message.
* @debug: A debugging string.
*
* Create a new info message. The message will make copies of @error and
* @debug.
*
* Returns: (transfer full): the new info message.
*
* MT safe.
*/
GstMessage *
gst_message_new_info (GstObject * src, GError * error, const gchar * debug)
{
return gst_message_new_info_with_details (src, error, debug, NULL);
}
/**
* gst_message_parse_info_details:
* @message: The message object
* @structure: (transfer none) (out): A pointer to the returned details structure
*
* Returns the optional details structure, may be NULL if none
* The returned structure must not be freed.
*
* Since: 1.10
*/
void
gst_message_parse_info_details (GstMessage * message,
const GstStructure ** structure)
{
const GValue *v;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_INFO);
g_return_if_fail (structure != NULL);
*structure = NULL;
v = gst_structure_id_get_value (GST_MESSAGE_STRUCTURE (message),
details_quark);
if (v) {
*structure = g_value_get_boxed (v);
}
}
/**
* gst_message_new_tag:
* @src: (transfer none) (allow-none): The object originating the message.
* @tag_list: (transfer full): 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: (transfer full): the new tag message.
*
* MT safe.
*/
GstMessage *
gst_message_new_tag (GstObject * src, GstTagList * tag_list)
{
GstStructure *s;
GstMessage *message;
GValue val = G_VALUE_INIT;
g_return_val_if_fail (GST_IS_TAG_LIST (tag_list), NULL);
s = gst_structure_new_id_empty (GST_QUARK (MESSAGE_TAG));
g_value_init (&val, GST_TYPE_TAG_LIST);
g_value_take_boxed (&val, tag_list);
gst_structure_id_take_value (s, GST_QUARK (TAGLIST), &val);
message = gst_message_new_custom (GST_MESSAGE_TAG, src, s);
return message;
}
/**
* gst_message_new_buffering:
* @src: (transfer none) (allow-none): 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.
*
* MT safe.
*
* Returns: (transfer full) (nullable): The new buffering message.
*/
GstMessage *
gst_message_new_buffering (GstObject * src, gint percent)
{
GstMessage *message;
GstStructure *structure;
gint64 buffering_left;
g_return_val_if_fail (percent >= 0 && percent <= 100, NULL);
buffering_left = (percent == 100 ? 0 : -1);
structure = gst_structure_new_id (GST_QUARK (MESSAGE_BUFFERING),
GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, percent,
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
message = gst_message_new_custom (GST_MESSAGE_BUFFERING, src, structure);
return message;
}
/**
* gst_message_new_state_changed:
* @src: (transfer none) (allow-none): 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: (transfer full): the new state change message.
*
* MT safe.
*/
GstMessage *
gst_message_new_state_changed (GstObject * src,
GstState oldstate, GstState newstate, GstState pending)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_STATE_CHANGED),
GST_QUARK (OLD_STATE), GST_TYPE_STATE, (gint) oldstate,
GST_QUARK (NEW_STATE), GST_TYPE_STATE, (gint) newstate,
GST_QUARK (PENDING_STATE), GST_TYPE_STATE, (gint) pending, NULL);
message = gst_message_new_custom (GST_MESSAGE_STATE_CHANGED, src, structure);
return message;
}
/**
* gst_message_new_state_dirty:
* @src: (transfer none) (allow-none): 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: (transfer full): the new state dirty message.
*
* MT safe.
*/
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: (transfer none) (allow-none): The object originating the message.
* @clock: (transfer none): 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: (transfer full): the new provide clock message.
*
* MT safe.
*/
GstMessage *
gst_message_new_clock_provide (GstObject * src, GstClock * clock,
gboolean ready)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_CLOCK_PROVIDE),
GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock,
GST_QUARK (READY), G_TYPE_BOOLEAN, ready, NULL);
message = gst_message_new_custom (GST_MESSAGE_CLOCK_PROVIDE, src, structure);
return message;
}
/**
* gst_message_new_clock_lost:
* @src: (transfer none) (allow-none): The object originating the message.
* @clock: (transfer none): 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: (transfer full): The new clock lost message.
*
* MT safe.
*/
GstMessage *
gst_message_new_clock_lost (GstObject * src, GstClock * clock)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_CLOCK_LOST),
GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock, NULL);
message = gst_message_new_custom (GST_MESSAGE_CLOCK_LOST, src, structure);
return message;
}
/**
* gst_message_new_new_clock:
* @src: (transfer none) (allow-none): The object originating the message.
* @clock: (transfer none): the new selected clock
*
* Create a new clock message. This message is posted whenever the
* pipeline selects a new clock for the pipeline.
*
* Returns: (transfer full): The new new clock message.
*
* MT safe.
*/
GstMessage *
gst_message_new_new_clock (GstObject * src, GstClock * clock)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_NEW_CLOCK),
GST_QUARK (CLOCK), GST_TYPE_CLOCK, clock, NULL);
message = gst_message_new_custom (GST_MESSAGE_NEW_CLOCK, src, structure);
return message;
}
/**
* gst_message_new_structure_change:
* @src: (transfer none) (allow-none): The object originating the message.
* @type: The change type.
* @owner: (transfer none): The owner element of @src.
* @busy: Whether the structure change is busy.
*
* Create a new structure change message. This message is posted when the
* structure of a pipeline is in the process of being changed, for example
* when pads are linked or unlinked.
*
* @src should be the sinkpad that unlinked or linked.
*
* Returns: (transfer full): the new structure change message.
*
* MT safe.
*/
GstMessage *
gst_message_new_structure_change (GstObject * src, GstStructureChangeType type,
GstElement * owner, gboolean busy)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (GST_IS_PAD (src), NULL);
/* g_return_val_if_fail (GST_PAD_DIRECTION (src) == GST_PAD_SINK, NULL); */
g_return_val_if_fail (GST_IS_ELEMENT (owner), NULL);
structure = gst_structure_new_id (GST_QUARK (MESSAGE_STRUCTURE_CHANGE),
GST_QUARK (TYPE), GST_TYPE_STRUCTURE_CHANGE_TYPE, type,
GST_QUARK (OWNER), GST_TYPE_ELEMENT, owner,
GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy, NULL);
message = gst_message_new_custom (GST_MESSAGE_STRUCTURE_CHANGE, src,
structure);
return message;
}
/**
* gst_message_new_segment_start:
* @src: (transfer none) (allow-none): 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: (transfer full): the new segment start message.
*
* MT safe.
*/
GstMessage *
gst_message_new_segment_start (GstObject * src, GstFormat format,
gint64 position)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_SEGMENT_START),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
message = gst_message_new_custom (GST_MESSAGE_SEGMENT_START, src, structure);
return message;
}
/**
* gst_message_new_segment_done:
* @src: (transfer none) (allow-none): 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: (transfer full): the new segment done message.
*
* MT safe.
*/
GstMessage *
gst_message_new_segment_done (GstObject * src, GstFormat format,
gint64 position)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_SEGMENT_DONE),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (POSITION), G_TYPE_INT64, position, NULL);
message = gst_message_new_custom (GST_MESSAGE_SEGMENT_DONE, src, structure);
return message;
}
/**
* gst_message_new_application:
* @src: (transfer none) (allow-none): The object originating the message.
* @structure: (transfer full): 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: (transfer full) (nullable): The new application message.
*
* MT safe.
*/
GstMessage *
gst_message_new_application (GstObject * src, GstStructure * structure)
{
g_return_val_if_fail (structure != NULL, NULL);
return gst_message_new_custom (GST_MESSAGE_APPLICATION, src, structure);
}
/**
* gst_message_new_element:
* @src: (transfer none) (allow-none): The object originating the message.
* @structure: (transfer full): 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: (transfer full) (nullable): The new element message.
*
* MT safe.
*/
GstMessage *
gst_message_new_element (GstObject * src, GstStructure * structure)
{
g_return_val_if_fail (structure != NULL, NULL);
return gst_message_new_custom (GST_MESSAGE_ELEMENT, src, structure);
}
/**
* gst_message_new_duration_changed:
* @src: (transfer none) (allow-none): The object originating the message.
*
* Create a new duration changed message. This message is posted by elements
* that know the duration of a stream when the duration changes. This message
* is received by bins and is used to calculate the total duration of a
* pipeline.
*
* Returns: (transfer full): The new duration-changed message.
*
* MT safe.
*/
GstMessage *
gst_message_new_duration_changed (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_DURATION_CHANGED, src,
gst_structure_new_id_empty (GST_QUARK (MESSAGE_DURATION_CHANGED)));
return message;
}
/**
* gst_message_new_async_start:
* @src: (transfer none) (allow-none): The object originating the message.
*
* This message is posted by elements when they start an ASYNC state change.
*
* Returns: (transfer full): The new async_start message.
*
* MT safe.
*/
GstMessage *
gst_message_new_async_start (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_ASYNC_START, src, NULL);
return message;
}
/**
* gst_message_new_async_done:
* @src: (transfer none) (allow-none): The object originating the message.
* @running_time: the desired running_time
*
* The message is posted when elements completed an ASYNC state change.
* @running_time contains the time of the desired running_time when this
* elements goes to PLAYING. A value of #GST_CLOCK_TIME_NONE for @running_time
* means that the element has no clock interaction and thus doesn't care about
* the running_time of the pipeline.
*
* Returns: (transfer full): The new async_done message.
*
* MT safe.
*/
GstMessage *
gst_message_new_async_done (GstObject * src, GstClockTime running_time)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_ASYNC_DONE),
GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time, NULL);
message = gst_message_new_custom (GST_MESSAGE_ASYNC_DONE, src, structure);
return message;
}
/**
* gst_message_new_latency:
* @src: (transfer none) (allow-none): The object originating the message.
*
* This message can be posted by elements when their latency requirements have
* changed.
*
* Returns: (transfer full): The new latency message.
*
* MT safe.
*/
GstMessage *
gst_message_new_latency (GstObject * src)
{
GstMessage *message;
message = gst_message_new_custom (GST_MESSAGE_LATENCY, src, NULL);
return message;
}
/**
* gst_message_new_request_state:
* @src: (transfer none) (allow-none): The object originating the message.
* @state: The new requested state
*
* This message can be posted by elements when they want to have their state
* changed. A typical use case would be an audio server that wants to pause the
* pipeline because a higher priority stream is being played.
*
* Returns: (transfer full): the new request state message.
*
* MT safe.
*/
GstMessage *
gst_message_new_request_state (GstObject * src, GstState state)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_REQUEST_STATE),
GST_QUARK (NEW_STATE), GST_TYPE_STATE, (gint) state, NULL);
message = gst_message_new_custom (GST_MESSAGE_REQUEST_STATE, src, structure);
return message;
}
/**
* gst_message_get_structure:
* @message: The #GstMessage.
*
* Access the structure of the message.
*
* Returns: (transfer none) (nullable): 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.
*/
const GstStructure *
gst_message_get_structure (GstMessage * message)
{
g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
return GST_MESSAGE_STRUCTURE (message);
}
/**
* gst_message_writable_structure:
* @message: The #GstMessage.
*
* Get a writable version of the structure.
*
* Returns: (transfer none): 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.
* This function checks if @message is writable and will never return
* %NULL.
*
* MT safe.
*
* Since: 1.14
*/
GstStructure *
gst_message_writable_structure (GstMessage * message)
{
GstStructure *structure;
g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
g_return_val_if_fail (gst_message_is_writable (message), NULL);
structure = GST_MESSAGE_STRUCTURE (message);
if (structure == NULL) {
structure =
gst_structure_new_id_empty (gst_message_type_to_quark (GST_MESSAGE_TYPE
(message)));
gst_structure_set_parent_refcount (structure,
&message->mini_object.refcount);
GST_MESSAGE_STRUCTURE (message) = structure;
}
return structure;
}
/**
* gst_message_has_name:
* @message: The #GstMessage.
* @name: name to check
*
* Checks if @message has the given @name. This function is usually used to
* check the name of a custom message.
*
* Returns: %TRUE if @name matches the name of the message structure.
*/
gboolean
gst_message_has_name (GstMessage * message, const gchar * name)
{
GstStructure *structure;
g_return_val_if_fail (GST_IS_MESSAGE (message), FALSE);
structure = GST_MESSAGE_STRUCTURE (message);
if (structure == NULL)
return FALSE;
return gst_structure_has_name (structure, name);
}
/**
* gst_message_parse_tag:
* @message: A valid #GstMessage of type GST_MESSAGE_TAG.
* @tag_list: (out callee-allocates): 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.
*
* Typical usage of this function might be:
* |[<!-- language="C" -->
* ...
* switch (GST_MESSAGE_TYPE (msg)) {
* case GST_MESSAGE_TAG: {
* GstTagList *tags = NULL;
*
* gst_message_parse_tag (msg, &amp;tags);
* g_print ("Got tags from element %s\n", GST_OBJECT_NAME (msg->src));
* handle_tags (tags);
* gst_tag_list_unref (tags);
* break;
* }
* ...
* }
* ...
* ]|
*
* MT safe.
*/
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);
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (TAGLIST), GST_TYPE_TAG_LIST, tag_list, NULL);
}
/**
* gst_message_parse_buffering:
* @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
* @percent: (out) (allow-none): Return location for the percent.
*
* Extracts the buffering percent from the GstMessage. see also
* gst_message_new_buffering().
*
* MT safe.
*/
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)
*percent =
g_value_get_int (gst_structure_id_get_value (GST_MESSAGE_STRUCTURE
(message), GST_QUARK (BUFFER_PERCENT)));
}
/**
* gst_message_set_buffering_stats:
* @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
* @mode: a buffering mode
* @avg_in: the average input rate
* @avg_out: the average output rate
* @buffering_left: amount of buffering time left in milliseconds
*
* Configures the buffering stats values in @message.
*/
void
gst_message_set_buffering_stats (GstMessage * message, GstBufferingMode mode,
gint avg_in, gint avg_out, gint64 buffering_left)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);
gst_structure_id_set (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, mode,
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, avg_in,
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, avg_out,
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
}
/**
* gst_message_parse_buffering_stats:
* @message: A valid #GstMessage of type GST_MESSAGE_BUFFERING.
* @mode: (out) (allow-none): a buffering mode, or %NULL
* @avg_in: (out) (allow-none): the average input rate, or %NULL
* @avg_out: (out) (allow-none): the average output rate, or %NULL
* @buffering_left: (out) (allow-none): amount of buffering time left in
* milliseconds, or %NULL
*
* Extracts the buffering stats values from @message.
*/
void
gst_message_parse_buffering_stats (GstMessage * message,
GstBufferingMode * mode, gint * avg_in, gint * avg_out,
gint64 * buffering_left)
{
GstStructure *structure;
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_BUFFERING);
structure = GST_MESSAGE_STRUCTURE (message);
if (mode)
*mode = (GstBufferingMode)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (BUFFERING_MODE)));
if (avg_in)
*avg_in = g_value_get_int (gst_structure_id_get_value (structure,
GST_QUARK (AVG_IN_RATE)));
if (avg_out)
*avg_out = g_value_get_int (gst_structure_id_get_value (structure,
GST_QUARK (AVG_OUT_RATE)));
if (buffering_left)
*buffering_left =
g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (BUFFERING_LEFT)));
}
/**
* gst_message_parse_state_changed:
* @message: a valid #GstMessage of type GST_MESSAGE_STATE_CHANGED
* @oldstate: (out) (allow-none): the previous state, or %NULL
* @newstate: (out) (allow-none): the new (current) state, or %NULL
* @pending: (out) (allow-none): the pending (target) state, or %NULL
*
* Extracts the old and new states from the GstMessage.
*
* Typical usage of this function might be:
* |[<!-- language="C" -->
* ...
* switch (GST_MESSAGE_TYPE (msg)) {
* case GST_MESSAGE_STATE_CHANGED: {
* GstState old_state, new_state;
*
* gst_message_parse_state_changed (msg, &amp;old_state, &amp;new_state, NULL);
* g_print ("Element %s changed state from %s to %s.\n",
* GST_OBJECT_NAME (msg->src),
* gst_element_state_get_name (old_state),
* gst_element_state_get_name (new_state));
* break;
* }
* ...
* }
* ...
* ]|
*
* MT safe.
*/
void
gst_message_parse_state_changed (GstMessage * message,
GstState * oldstate, GstState * newstate, GstState * pending)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STATE_CHANGED);
structure = GST_MESSAGE_STRUCTURE (message);
if (oldstate)
*oldstate = (GstState)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (OLD_STATE)));
if (newstate)
*newstate = (GstState)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (NEW_STATE)));
if (pending)
*pending = (GstState)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (PENDING_STATE)));
}
/**
* gst_message_parse_clock_provide:
* @message: A valid #GstMessage of type GST_MESSAGE_CLOCK_PROVIDE.
* @clock: (out) (allow-none) (transfer none): a pointer to hold a clock
* object, or %NULL
* @ready: (out) (allow-none): a pointer to hold the ready flag, or %NULL
*
* Extracts the clock and ready flag from the GstMessage.
* The clock object returned remains valid until the message is freed.
*
* MT safe.
*/
void
gst_message_parse_clock_provide (GstMessage * message, GstClock ** clock,
gboolean * ready)
{
const GValue *clock_gvalue;
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_PROVIDE);
structure = GST_MESSAGE_STRUCTURE (message);
clock_gvalue = gst_structure_id_get_value (structure, GST_QUARK (CLOCK));
g_return_if_fail (clock_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (clock_gvalue) == GST_TYPE_CLOCK);
if (ready)
*ready =
g_value_get_boolean (gst_structure_id_get_value (structure,
GST_QUARK (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: (out) (allow-none) (transfer none): 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.
*/
void
gst_message_parse_clock_lost (GstMessage * message, GstClock ** clock)
{
const GValue *clock_gvalue;
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_CLOCK_LOST);
structure = GST_MESSAGE_STRUCTURE (message);
clock_gvalue = gst_structure_id_get_value (structure, GST_QUARK (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: (out) (allow-none) (transfer none): 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.
*/
void
gst_message_parse_new_clock (GstMessage * message, GstClock ** clock)
{
const GValue *clock_gvalue;
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEW_CLOCK);
structure = GST_MESSAGE_STRUCTURE (message);
clock_gvalue = gst_structure_id_get_value (structure, GST_QUARK (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_structure_change:
* @message: A valid #GstMessage of type GST_MESSAGE_STRUCTURE_CHANGE.
* @type: (out): A pointer to hold the change type
* @owner: (out) (allow-none) (transfer none): The owner element of the
* message source
* @busy: (out) (allow-none): a pointer to hold whether the change is in
* progress or has been completed
*
* Extracts the change type and completion status from the GstMessage.
*
* MT safe.
*/
void
gst_message_parse_structure_change (GstMessage * message,
GstStructureChangeType * type, GstElement ** owner, gboolean * busy)
{
const GValue *owner_gvalue;
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STRUCTURE_CHANGE);
structure = GST_MESSAGE_STRUCTURE (message);
owner_gvalue = gst_structure_id_get_value (structure, GST_QUARK (OWNER));
g_return_if_fail (owner_gvalue != NULL);
g_return_if_fail (G_VALUE_TYPE (owner_gvalue) == GST_TYPE_ELEMENT);
if (type)
*type = (GstStructureChangeType)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (TYPE)));
if (owner)
*owner = (GstElement *) g_value_get_object (owner_gvalue);
if (busy)
*busy =
g_value_get_boolean (gst_structure_id_get_value (structure,
GST_QUARK (BUSY)));
}
/**
* gst_message_parse_error:
* @message: A valid #GstMessage of type GST_MESSAGE_ERROR.
* @gerror: (out) (allow-none) (transfer full): location for the GError
* @debug: (out) (allow-none) (transfer full): 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.
*
* Typical usage of this function might be:
* |[<!-- language="C" -->
* ...
* switch (GST_MESSAGE_TYPE (msg)) {
* case GST_MESSAGE_ERROR: {
* GError *err = NULL;
* gchar *dbg_info = NULL;
*
* gst_message_parse_error (msg, &amp;err, &amp;dbg_info);
* g_printerr ("ERROR from element %s: %s\n",
* GST_OBJECT_NAME (msg->src), err->message);
* g_printerr ("Debugging info: %s\n", (dbg_info) ? dbg_info : "none");
* g_error_free (err);
* g_free (dbg_info);
* break;
* }
* ...
* }
* ...
* ]|
*
* MT safe.
*/
void
gst_message_parse_error (GstMessage * message, GError ** gerror, gchar ** debug)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR);
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (GERROR), G_TYPE_ERROR, gerror,
GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
}
/**
* gst_message_parse_warning:
* @message: A valid #GstMessage of type GST_MESSAGE_WARNING.
* @gerror: (out) (allow-none) (transfer full): location for the GError
* @debug: (out) (allow-none) (transfer full): 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.
*/
void
gst_message_parse_warning (GstMessage * message, GError ** gerror,
gchar ** debug)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING);
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (GERROR), G_TYPE_ERROR, gerror,
GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
}
/**
* gst_message_parse_info:
* @message: A valid #GstMessage of type GST_MESSAGE_INFO.
* @gerror: (out) (allow-none) (transfer full): location for the GError
* @debug: (out) (allow-none) (transfer full): 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.
*/
void
gst_message_parse_info (GstMessage * message, GError ** gerror, gchar ** debug)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_INFO);
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (GERROR), G_TYPE_ERROR, gerror,
GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
}
/**
* gst_message_parse_segment_start:
* @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_START.
* @format: (out) (allow-none): Result location for the format, or %NULL
* @position: (out) (allow-none): Result location for the position, or %NULL
*
* Extracts the position and format from the segment start message.
*
* MT safe.
*/
void
gst_message_parse_segment_start (GstMessage * message, GstFormat * format,
gint64 * position)
{
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_STRUCTURE (message);
if (format)
*format = (GstFormat)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (position)
*position =
g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (POSITION)));
}
/**
* gst_message_parse_segment_done:
* @message: A valid #GstMessage of type GST_MESSAGE_SEGMENT_DONE.
* @format: (out) (allow-none): Result location for the format, or %NULL
* @position: (out) (allow-none): Result location for the position, or %NULL
*
* Extracts the position and format from the segment done message.
*
* MT safe.
*/
void
gst_message_parse_segment_done (GstMessage * message, GstFormat * format,
gint64 * position)
{
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_STRUCTURE (message);
if (format)
*format = (GstFormat)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (position)
*position =
g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (POSITION)));
}
/**
* gst_message_parse_async_done:
* @message: A valid #GstMessage of type GST_MESSAGE_ASYNC_DONE.
* @running_time: (out) (allow-none): Result location for the running_time or %NULL
*
* Extract the running_time from the async_done message.
*
* MT safe.
*/
void
gst_message_parse_async_done (GstMessage * message, GstClockTime * running_time)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ASYNC_DONE);
structure = GST_MESSAGE_STRUCTURE (message);
if (running_time)
*running_time =
g_value_get_uint64 (gst_structure_id_get_value (structure,
GST_QUARK (RUNNING_TIME)));
}
/**
* gst_message_parse_request_state:
* @message: A valid #GstMessage of type GST_MESSAGE_REQUEST_STATE.
* @state: (out) (allow-none): Result location for the requested state or %NULL
*
* Extract the requested state from the request_state message.
*
* MT safe.
*/
void
gst_message_parse_request_state (GstMessage * message, GstState * state)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_REQUEST_STATE);
structure = GST_MESSAGE_STRUCTURE (message);
if (state)
*state = (GstState)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (NEW_STATE)));
}
/**
* gst_message_new_stream_status:
* @src: The object originating the message.
* @type: The stream status type.
* @owner: (transfer none): the owner element of @src.
*
* Create a new stream status message. This message is posted when a streaming
* thread is created/destroyed or when the state changed.
*
* Returns: (transfer full): the new stream status message.
*
* MT safe.
*/
GstMessage *
gst_message_new_stream_status (GstObject * src, GstStreamStatusType type,
GstElement * owner)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_STREAM_STATUS),
GST_QUARK (TYPE), GST_TYPE_STREAM_STATUS_TYPE, (gint) type,
GST_QUARK (OWNER), GST_TYPE_ELEMENT, owner, NULL);
message = gst_message_new_custom (GST_MESSAGE_STREAM_STATUS, src, structure);
return message;
}
/**
* gst_message_parse_stream_status:
* @message: A valid #GstMessage of type GST_MESSAGE_STREAM_STATUS.
* @type: (out): A pointer to hold the status type
* @owner: (out) (transfer none): The owner element of the message source
*
* Extracts the stream status type and owner the GstMessage. The returned
* owner remains valid for as long as the reference to @message is valid and
* should thus not be unreffed.
*
* MT safe.
*/
void
gst_message_parse_stream_status (GstMessage * message,
GstStreamStatusType * type, GstElement ** owner)
{
const GValue *owner_gvalue;
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_STATUS);
structure = GST_MESSAGE_STRUCTURE (message);
owner_gvalue = gst_structure_id_get_value (structure, GST_QUARK (OWNER));
g_return_if_fail (owner_gvalue != NULL);
if (type)
*type = (GstStreamStatusType)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (TYPE)));
if (owner)
*owner = (GstElement *) g_value_get_object (owner_gvalue);
}
/**
* gst_message_set_stream_status_object:
* @message: A valid #GstMessage of type GST_MESSAGE_STREAM_STATUS.
* @object: the object controlling the streaming
*
* Configures the object handling the streaming thread. This is usually a
* GstTask object but other objects might be added in the future.
*/
void
gst_message_set_stream_status_object (GstMessage * message,
const GValue * object)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_STATUS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_set_value (structure, GST_QUARK (OBJECT), object);
}
/**
* gst_message_get_stream_status_object:
* @message: A valid #GstMessage of type GST_MESSAGE_STREAM_STATUS.
*
* Extracts the object managing the streaming thread from @message.
*
* Returns: (nullable): a GValue containing the object that manages the
* streaming thread. This object is usually of type GstTask but other types can
* be added in the future. The object remains valid as long as @message is
* valid.
*/
const GValue *
gst_message_get_stream_status_object (GstMessage * message)
{
const GValue *result;
GstStructure *structure;
g_return_val_if_fail (GST_IS_MESSAGE (message), NULL);
g_return_val_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_STATUS,
NULL);
structure = GST_MESSAGE_STRUCTURE (message);
result = gst_structure_id_get_value (structure, GST_QUARK (OBJECT));
return result;
}
/**
* gst_message_new_step_done:
* @src: The object originating the message.
* @format: the format of @amount
* @amount: the amount of stepped data
* @rate: the rate of the stepped amount
* @flush: is this an flushing step
* @intermediate: is this an intermediate step
* @duration: the duration of the data
* @eos: the step caused EOS
*
* This message is posted by elements when they complete a part, when @intermediate set
* to %TRUE, or a complete step operation.
*
* @duration will contain the amount of time (in GST_FORMAT_TIME) of the stepped
* @amount of media in format @format.
*
* Returns: (transfer full): the new step_done message.
*
* MT safe.
*/
GstMessage *
gst_message_new_step_done (GstObject * src, GstFormat format, guint64 amount,
gdouble rate, gboolean flush, gboolean intermediate, guint64 duration,
gboolean eos)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_STEP_DONE),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate,
GST_QUARK (DURATION), G_TYPE_UINT64, duration,
GST_QUARK (EOS), G_TYPE_BOOLEAN, eos, NULL);
message = gst_message_new_custom (GST_MESSAGE_STEP_DONE, src, structure);
return message;
}
/**
* gst_message_parse_step_done:
* @message: A valid #GstMessage of type GST_MESSAGE_STEP_DONE.
* @format: (out) (allow-none): result location for the format
* @amount: (out) (allow-none): result location for the amount
* @rate: (out) (allow-none): result location for the rate
* @flush: (out) (allow-none): result location for the flush flag
* @intermediate: (out) (allow-none): result location for the intermediate flag
* @duration: (out) (allow-none): result location for the duration
* @eos: (out) (allow-none): result location for the EOS flag
*
* Extract the values the step_done message.
*
* MT safe.
*/
void
gst_message_parse_step_done (GstMessage * message, GstFormat * format,
guint64 * amount, gdouble * rate, gboolean * flush, gboolean * intermediate,
guint64 * duration, gboolean * eos)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STEP_DONE);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_get (structure,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate,
GST_QUARK (DURATION), G_TYPE_UINT64, duration,
GST_QUARK (EOS), G_TYPE_BOOLEAN, eos, NULL);
}
/**
* gst_message_new_step_start:
* @src: The object originating the message.
* @active: if the step is active or queued
* @format: the format of @amount
* @amount: the amount of stepped data
* @rate: the rate of the stepped amount
* @flush: is this an flushing step
* @intermediate: is this an intermediate step
*
* This message is posted by elements when they accept or activate a new step
* event for @amount in @format.
*
* @active is set to %FALSE when the element accepted the new step event and has
* queued it for execution in the streaming threads.
*
* @active is set to %TRUE when the element has activated the step operation and
* is now ready to start executing the step in the streaming thread. After this
* message is emitted, the application can queue a new step operation in the
* element.
*
* Returns: (transfer full): The new step_start message.
*
* MT safe.
*/
GstMessage *
gst_message_new_step_start (GstObject * src, gboolean active, GstFormat format,
guint64 amount, gdouble rate, gboolean flush, gboolean intermediate)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_STEP_START),
GST_QUARK (ACTIVE), G_TYPE_BOOLEAN, active,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate, NULL);
message = gst_message_new_custom (GST_MESSAGE_STEP_START, src, structure);
return message;
}
/**
* gst_message_parse_step_start:
* @message: A valid #GstMessage of type GST_MESSAGE_STEP_DONE.
* @active: (out) (allow-none): result location for the active flag
* @format: (out) (allow-none): result location for the format
* @amount: (out) (allow-none): result location for the amount
* @rate: (out) (allow-none): result location for the rate
* @flush: (out) (allow-none): result location for the flush flag
* @intermediate: (out) (allow-none): result location for the intermediate flag
*
* Extract the values from step_start message.
*
* MT safe.
*/
void
gst_message_parse_step_start (GstMessage * message, gboolean * active,
GstFormat * format, guint64 * amount, gdouble * rate, gboolean * flush,
gboolean * intermediate)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STEP_START);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_get (structure,
GST_QUARK (ACTIVE), G_TYPE_BOOLEAN, active,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (AMOUNT), G_TYPE_UINT64, amount,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FLUSH), G_TYPE_BOOLEAN, flush,
GST_QUARK (INTERMEDIATE), G_TYPE_BOOLEAN, intermediate, NULL);
}
/**
* gst_message_new_qos:
* @src: The object originating the message.
* @live: if the message was generated by a live element
* @running_time: the running time of the buffer that generated the message
* @stream_time: the stream time of the buffer that generated the message
* @timestamp: the timestamps of the buffer that generated the message
* @duration: the duration of the buffer that generated the message
*
* A QOS message is posted on the bus whenever an element decides to drop a
* buffer because of QoS reasons or whenever it changes its processing strategy
* because of QoS reasons (quality adjustments such as processing at lower
* accuracy).
*
* This message can be posted by an element that performs synchronisation against the
* clock (live) or it could be dropped by an element that performs QoS because of QOS
* events received from a downstream element (!live).
*
* @running_time, @stream_time, @timestamp, @duration should be set to the
* respective running-time, stream-time, timestamp and duration of the (dropped)
* buffer that generated the QoS event. Values can be left to
* GST_CLOCK_TIME_NONE when unknown.
*
* Returns: (transfer full): The new qos message.
*
* MT safe.
*/
GstMessage *
gst_message_new_qos (GstObject * src, gboolean live, guint64 running_time,
guint64 stream_time, guint64 timestamp, guint64 duration)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_QOS),
GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time,
GST_QUARK (STREAM_TIME), G_TYPE_UINT64, stream_time,
GST_QUARK (TIMESTAMP), G_TYPE_UINT64, timestamp,
GST_QUARK (DURATION), G_TYPE_UINT64, duration,
GST_QUARK (JITTER), G_TYPE_INT64, (gint64) 0,
GST_QUARK (PROPORTION), G_TYPE_DOUBLE, (gdouble) 1.0,
GST_QUARK (QUALITY), G_TYPE_INT, (gint) 1000000,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, GST_FORMAT_UNDEFINED,
GST_QUARK (PROCESSED), G_TYPE_UINT64, (guint64) - 1,
GST_QUARK (DROPPED), G_TYPE_UINT64, (guint64) - 1, NULL);
message = gst_message_new_custom (GST_MESSAGE_QOS, src, structure);
return message;
}
/**
* gst_message_set_qos_values:
* @message: A valid #GstMessage of type GST_MESSAGE_QOS.
* @jitter: The difference of the running-time against the deadline.
* @proportion: Long term prediction of the ideal rate relative to normal rate
* to get optimal quality.
* @quality: An element dependent integer value that specifies the current
* quality level of the element. The default maximum quality is 1000000.
*
* Set the QoS values that have been calculated/analysed from the QoS data
*
* MT safe.
*/
void
gst_message_set_qos_values (GstMessage * message, gint64 jitter,
gdouble proportion, gint quality)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_set (structure,
GST_QUARK (JITTER), G_TYPE_INT64, jitter,
GST_QUARK (PROPORTION), G_TYPE_DOUBLE, proportion,
GST_QUARK (QUALITY), G_TYPE_INT, quality, NULL);
}
/**
* gst_message_set_qos_stats:
* @message: A valid #GstMessage of type GST_MESSAGE_QOS.
* @format: Units of the 'processed' and 'dropped' fields. Video sinks and video
* filters will use GST_FORMAT_BUFFERS (frames). Audio sinks and audio filters
* will likely use GST_FORMAT_DEFAULT (samples).
* @processed: Total number of units correctly processed since the last state
* change to READY or a flushing operation.
* @dropped: Total number of units dropped since the last state change to READY
* or a flushing operation.
*
* Set the QoS stats representing the history of the current continuous pipeline
* playback period.
*
* When @format is @GST_FORMAT_UNDEFINED both @dropped and @processed are
* invalid. Values of -1 for either @processed or @dropped mean unknown values.
*
* MT safe.
*/
void
gst_message_set_qos_stats (GstMessage * message, GstFormat format,
guint64 processed, guint64 dropped)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_set (structure,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (PROCESSED), G_TYPE_UINT64, processed,
GST_QUARK (DROPPED), G_TYPE_UINT64, dropped, NULL);
}
/**
* gst_message_parse_qos:
* @message: A valid #GstMessage of type GST_MESSAGE_QOS.
* @live: (out) (allow-none): if the message was generated by a live element
* @running_time: (out) (allow-none): the running time of the buffer that
* generated the message
* @stream_time: (out) (allow-none): the stream time of the buffer that
* generated the message
* @timestamp: (out) (allow-none): the timestamps of the buffer that
* generated the message
* @duration: (out) (allow-none): the duration of the buffer that
* generated the message
*
* Extract the timestamps and live status from the QoS message.
*
* The returned values give the running_time, stream_time, timestamp and
* duration of the dropped buffer. Values of GST_CLOCK_TIME_NONE mean unknown
* values.
*
* MT safe.
*/
void
gst_message_parse_qos (GstMessage * message, gboolean * live,
guint64 * running_time, guint64 * stream_time, guint64 * timestamp,
guint64 * duration)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_get (structure,
GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time,
GST_QUARK (STREAM_TIME), G_TYPE_UINT64, stream_time,
GST_QUARK (TIMESTAMP), G_TYPE_UINT64, timestamp,
GST_QUARK (DURATION), G_TYPE_UINT64, duration, NULL);
}
/**
* gst_message_parse_qos_values:
* @message: A valid #GstMessage of type GST_MESSAGE_QOS.
* @jitter: (out) (allow-none): The difference of the running-time against
* the deadline.
* @proportion: (out) (allow-none): Long term prediction of the ideal rate
* relative to normal rate to get optimal quality.
* @quality: (out) (allow-none): An element dependent integer value that
* specifies the current quality level of the element. The default
* maximum quality is 1000000.
*
* Extract the QoS values that have been calculated/analysed from the QoS data
*
* MT safe.
*/
void
gst_message_parse_qos_values (GstMessage * message, gint64 * jitter,
gdouble * proportion, gint * quality)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_get (structure,
GST_QUARK (JITTER), G_TYPE_INT64, jitter,
GST_QUARK (PROPORTION), G_TYPE_DOUBLE, proportion,
GST_QUARK (QUALITY), G_TYPE_INT, quality, NULL);
}
/**
* gst_message_parse_qos_stats:
* @message: A valid #GstMessage of type GST_MESSAGE_QOS.
* @format: (out) (allow-none): Units of the 'processed' and 'dropped' fields.
* Video sinks and video filters will use GST_FORMAT_BUFFERS (frames).
* Audio sinks and audio filters will likely use GST_FORMAT_DEFAULT
* (samples).
* @processed: (out) (allow-none): Total number of units correctly processed
* since the last state change to READY or a flushing operation.
* @dropped: (out) (allow-none): Total number of units dropped since the last
* state change to READY or a flushing operation.
*
* Extract the QoS stats representing the history of the current continuous
* pipeline playback period.
*
* When @format is @GST_FORMAT_UNDEFINED both @dropped and @processed are
* invalid. Values of -1 for either @processed or @dropped mean unknown values.
*
* MT safe.
*/
void
gst_message_parse_qos_stats (GstMessage * message, GstFormat * format,
guint64 * processed, guint64 * dropped)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_QOS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_get (structure,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (PROCESSED), G_TYPE_UINT64, processed,
GST_QUARK (DROPPED), G_TYPE_UINT64, dropped, NULL);
}
/**
* gst_message_new_progress:
* @src: The object originating the message.
* @type: a #GstProgressType
* @code: a progress code
* @text: free, user visible text describing the progress
*
* Progress messages are posted by elements when they use an asynchronous task
* to perform actions triggered by a state change.
*
* @code contains a well defined string describing the action.
* @text should contain a user visible string detailing the current action.
*
* Returns: (transfer full) (nullable): The new qos message.
*/
GstMessage *
gst_message_new_progress (GstObject * src, GstProgressType type,
const gchar * code, const gchar * text)
{
GstMessage *message;
GstStructure *structure;
gint percent = 100, timeout = -1;
g_return_val_if_fail (code != NULL, NULL);
g_return_val_if_fail (text != NULL, NULL);
if (type == GST_PROGRESS_TYPE_START || type == GST_PROGRESS_TYPE_CONTINUE)
percent = 0;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_PROGRESS),
GST_QUARK (TYPE), GST_TYPE_PROGRESS_TYPE, type,
GST_QUARK (CODE), G_TYPE_STRING, code,
GST_QUARK (TEXT), G_TYPE_STRING, text,
GST_QUARK (PERCENT), G_TYPE_INT, percent,
GST_QUARK (TIMEOUT), G_TYPE_INT, timeout, NULL);
message = gst_message_new_custom (GST_MESSAGE_PROGRESS, src, structure);
return message;
}
/**
* gst_message_parse_progress:
* @message: A valid #GstMessage of type GST_MESSAGE_PROGRESS.
* @type: (out) (allow-none): location for the type
* @code: (out) (allow-none) (transfer full): location for the code
* @text: (out) (allow-none) (transfer full): location for the text
*
* Parses the progress @type, @code and @text.
*/
void
gst_message_parse_progress (GstMessage * message, GstProgressType * type,
gchar ** code, gchar ** text)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_PROGRESS);
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_get (structure,
GST_QUARK (TYPE), GST_TYPE_PROGRESS_TYPE, type,
GST_QUARK (CODE), G_TYPE_STRING, code,
GST_QUARK (TEXT), G_TYPE_STRING, text, NULL);
}
/**
* gst_message_new_toc:
* @src: the object originating the message.
* @toc: (transfer none): #GstToc structure for the message.
* @updated: whether TOC was updated or not.
*
* Create a new TOC message. The message is posted by elements
* that discovered or updated a TOC.
*
* Returns: (transfer full): a new TOC message.
*
* MT safe.
*/
GstMessage *
gst_message_new_toc (GstObject * src, GstToc * toc, gboolean updated)
{
GstStructure *toc_struct;
g_return_val_if_fail (toc != NULL, NULL);
toc_struct = gst_structure_new_id (GST_QUARK (MESSAGE_TOC),
GST_QUARK (TOC), GST_TYPE_TOC, toc,
GST_QUARK (UPDATED), G_TYPE_BOOLEAN, updated, NULL);
return gst_message_new_custom (GST_MESSAGE_TOC, src, toc_struct);
}
/**
* gst_message_parse_toc:
* @message: a valid #GstMessage of type GST_MESSAGE_TOC.
* @toc: (out) (transfer full): return location for the TOC.
* @updated: (out): return location for the updated flag.
*
* Extract the TOC from the #GstMessage. The TOC returned in the
* output argument is a copy; the caller must free it with
* gst_toc_unref() when done.
*
* MT safe.
*/
void
gst_message_parse_toc (GstMessage * message, GstToc ** toc, gboolean * updated)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_TOC);
g_return_if_fail (toc != NULL);
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (TOC), GST_TYPE_TOC, toc,
GST_QUARK (UPDATED), G_TYPE_BOOLEAN, updated, NULL);
}
/**
* gst_message_new_reset_time:
* @src: (transfer none) (allow-none): The object originating the message.
* @running_time: the requested running-time
*
* This message is posted when the pipeline running-time should be reset to
* @running_time, like after a flushing seek.
*
* Returns: (transfer full): The new reset_time message.
*
* MT safe.
*/
GstMessage *
gst_message_new_reset_time (GstObject * src, GstClockTime running_time)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_RESET_TIME),
GST_QUARK (RUNNING_TIME), G_TYPE_UINT64, running_time, NULL);
message = gst_message_new_custom (GST_MESSAGE_RESET_TIME, src, structure);
return message;
}
/**
* gst_message_parse_reset_time:
* @message: A valid #GstMessage of type GST_MESSAGE_RESET_TIME.
* @running_time: (out) (allow-none): Result location for the running_time or
* %NULL
*
* Extract the running-time from the RESET_TIME message.
*
* MT safe.
*/
void
gst_message_parse_reset_time (GstMessage * message, GstClockTime * running_time)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_RESET_TIME);
structure = GST_MESSAGE_STRUCTURE (message);
if (running_time)
*running_time =
g_value_get_uint64 (gst_structure_id_get_value (structure,
GST_QUARK (RUNNING_TIME)));
}
/**
* gst_message_new_stream_start:
* @src: (transfer none) (allow-none): The object originating the message.
*
* Create a new stream_start message. This message is generated and posted in
* the sink elements of a GstBin. The bin will only forward the STREAM_START
* message to the application if all sinks have posted an STREAM_START message.
*
* Returns: (transfer full): The new stream_start message.
*
* MT safe.
*/
GstMessage *
gst_message_new_stream_start (GstObject * src)
{
GstMessage *message;
GstStructure *s;
s = gst_structure_new_id_empty (GST_QUARK (MESSAGE_STREAM_START));
message = gst_message_new_custom (GST_MESSAGE_STREAM_START, src, s);
return message;
}
/**
* gst_message_set_group_id:
* @message: the message
* @group_id: the group id
*
* Sets the group id on the stream-start message.
*
* All streams that have the same group id are supposed to be played
* together, i.e. all streams inside a container file should have the
* same group id but different stream ids. The group id should change
* each time the stream is started, resulting in different group ids
* each time a file is played for example.
*
* MT safe.
*
* Since: 1.2
*/
void
gst_message_set_group_id (GstMessage * message, guint group_id)
{
GstStructure *structure;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_START);
g_return_if_fail (gst_message_is_writable (message));
structure = GST_MESSAGE_STRUCTURE (message);
gst_structure_id_set (structure, GST_QUARK (GROUP_ID), G_TYPE_UINT, group_id,
NULL);
}
/**
* gst_message_parse_group_id:
* @message: A valid #GstMessage of type GST_MESSAGE_STREAM_START.
* @group_id: (out) (allow-none): Result location for the group id or
* %NULL
*
* Extract the group from the STREAM_START message.
*
* Returns: %TRUE if the message had a group id set, %FALSE otherwise
*
* MT safe.
*
* Since: 1.2
*/
gboolean
gst_message_parse_group_id (GstMessage * message, guint * group_id)
{
GstStructure *structure;
const GValue *v;
g_return_val_if_fail (GST_IS_MESSAGE (message), FALSE);
g_return_val_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAM_START,
FALSE);
if (!group_id)
return TRUE;
structure = GST_MESSAGE_STRUCTURE (message);
v = gst_structure_id_get_value (structure, GST_QUARK (GROUP_ID));
if (!v)
return FALSE;
*group_id = g_value_get_uint (v);
return TRUE;
}
/**
* gst_message_new_need_context:
* @src: (transfer none) (allow-none): The object originating the message.
* @context_type: The context type that is needed
*
* This message is posted when an element needs a specific #GstContext.
*
* Returns: (transfer full): The new need-context message.
*
* MT safe.
*
* Since: 1.2
*/
GstMessage *
gst_message_new_need_context (GstObject * src, const gchar * context_type)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (context_type != NULL, NULL);
structure = gst_structure_new_id (GST_QUARK (MESSAGE_NEED_CONTEXT),
GST_QUARK (CONTEXT_TYPE), G_TYPE_STRING, context_type, NULL);
message = gst_message_new_custom (GST_MESSAGE_NEED_CONTEXT, src, structure);
return message;
}
/**
* gst_message_parse_context_type:
* @message: a GST_MESSAGE_NEED_CONTEXT type message
* @context_type: (out) (transfer none) (allow-none): the context type, or %NULL
*
* Parse a context type from an existing GST_MESSAGE_NEED_CONTEXT message.
*
* Returns: a #gboolean indicating if the parsing succeeded.
*
* Since: 1.2
*/
gboolean
gst_message_parse_context_type (GstMessage * message,
const gchar ** context_type)
{
GstStructure *structure;
const GValue *value;
g_return_val_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEED_CONTEXT,
FALSE);
structure = GST_MESSAGE_STRUCTURE (message);
if (context_type) {
value = gst_structure_id_get_value (structure, GST_QUARK (CONTEXT_TYPE));
*context_type = g_value_get_string (value);
}
return TRUE;
}
/**
* gst_message_new_have_context:
* @src: (transfer none) (allow-none): The object originating the message.
* @context: (transfer full): the context
*
* This message is posted when an element has a new local #GstContext.
*
* Returns: (transfer full): The new have-context message.
*
* MT safe.
*
* Since: 1.2
*/
GstMessage *
gst_message_new_have_context (GstObject * src, GstContext * context)
{
GstMessage *message;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (MESSAGE_HAVE_CONTEXT),
GST_QUARK (CONTEXT), GST_TYPE_CONTEXT, context, NULL);
message = gst_message_new_custom (GST_MESSAGE_HAVE_CONTEXT, src, structure);
gst_context_unref (context);
return message;
}
/**
* gst_message_parse_have_context:
* @message: A valid #GstMessage of type GST_MESSAGE_HAVE_CONTEXT.
* @context: (out) (transfer full) (allow-none): Result location for the
* context or %NULL
*
* Extract the context from the HAVE_CONTEXT message.
*
* MT safe.
*
* Since: 1.2
*/
void
gst_message_parse_have_context (GstMessage * message, GstContext ** context)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_HAVE_CONTEXT);
if (context)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (CONTEXT), GST_TYPE_CONTEXT, context, NULL);
}
/**
* gst_message_new_device_added:
* @src: The #GstObject that created the message
* @device: (transfer none): The new #GstDevice
*
* Creates a new device-added message. The device-added message is produced by
* #GstDeviceProvider or a #GstDeviceMonitor. They announce the appearance
* of monitored devices.
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.4
*/
GstMessage *
gst_message_new_device_added (GstObject * src, GstDevice * device)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (device != NULL, NULL);
g_return_val_if_fail (GST_IS_DEVICE (device), NULL);
structure = gst_structure_new_id (GST_QUARK (MESSAGE_DEVICE_ADDED),
GST_QUARK (DEVICE), GST_TYPE_DEVICE, device, NULL);
message = gst_message_new_custom (GST_MESSAGE_DEVICE_ADDED, src, structure);
return message;
}
/**
* gst_message_parse_device_added:
* @message: a #GstMessage of type %GST_MESSAGE_DEVICE_ADDED
* @device: (out) (allow-none) (transfer full): A location where to store a
* pointer to the new #GstDevice, or %NULL
*
* Parses a device-added message. The device-added message is produced by
* #GstDeviceProvider or a #GstDeviceMonitor. It announces the appearance
* of monitored devices.
*
* Since: 1.4
*/
void
gst_message_parse_device_added (GstMessage * message, GstDevice ** device)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_DEVICE_ADDED);
if (device)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (DEVICE), GST_TYPE_DEVICE, device, NULL);
}
/**
* gst_message_new_device_removed:
* @src: The #GstObject that created the message
* @device: (transfer none): The removed #GstDevice
*
* Creates a new device-removed message. The device-removed message is produced
* by #GstDeviceProvider or a #GstDeviceMonitor. They announce the
* disappearance of monitored devices.
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.4
*/
GstMessage *
gst_message_new_device_removed (GstObject * src, GstDevice * device)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (device != NULL, NULL);
g_return_val_if_fail (GST_IS_DEVICE (device), NULL);
structure = gst_structure_new_id (GST_QUARK (MESSAGE_DEVICE_REMOVED),
GST_QUARK (DEVICE), GST_TYPE_DEVICE, device, NULL);
message = gst_message_new_custom (GST_MESSAGE_DEVICE_REMOVED, src, structure);
return message;
}
/**
* gst_message_parse_device_removed:
* @message: a #GstMessage of type %GST_MESSAGE_DEVICE_REMOVED
* @device: (out) (allow-none) (transfer full): A location where to store a
* pointer to the removed #GstDevice, or %NULL
*
* Parses a device-removed message. The device-removed message is produced by
* #GstDeviceProvider or a #GstDeviceMonitor. It announces the
* disappearance of monitored devices.
*
* Since: 1.4
*/
void
gst_message_parse_device_removed (GstMessage * message, GstDevice ** device)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_DEVICE_REMOVED);
if (device)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (DEVICE), GST_TYPE_DEVICE, device, NULL);
}
/**
* gst_message_new_device_changed:
* @src: The #GstObject that created the message
* @device: (transfer none): The newly created device representing @replaced_device
* with its new configuration.
*
* Creates a new device-changed message. The device-changed message is produced
* by #GstDeviceProvider or a #GstDeviceMonitor. They announce that a device
* properties has changed and @device represent the new modified version of @changed_device.
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.16
*/
GstMessage *
gst_message_new_device_changed (GstObject * src, GstDevice * device,
GstDevice * changed_device)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (device != NULL, NULL);
g_return_val_if_fail (GST_IS_DEVICE (device), NULL);
structure = gst_structure_new_id (GST_QUARK (MESSAGE_DEVICE_CHANGED),
GST_QUARK (DEVICE), GST_TYPE_DEVICE, device,
GST_QUARK (DEVICE_CHANGED), GST_TYPE_DEVICE, changed_device, NULL);
message = gst_message_new_custom (GST_MESSAGE_DEVICE_CHANGED, src, structure);
return message;
}
/**
* gst_message_parse_device_changed:
* @message: a #GstMessage of type %GST_MESSAGE_DEVICE_CHANGED
* @device: (out) (allow-none) (transfer full): A location where to store a
* pointer to the updated version of the #GstDevice, or %NULL
* @changed_device: (out) (allow-none) (transfer full): A location where to store a
* pointer to the old version of the #GstDevice, or %NULL
*
* Parses a device-changed message. The device-changed message is produced by
* #GstDeviceProvider or a #GstDeviceMonitor. It announces the
* disappearance of monitored devices. * It announce that a device properties has
* changed and @device represents the new modified version of @changed_device.
*
* Since: 1.16
*/
void
gst_message_parse_device_changed (GstMessage * message, GstDevice ** device,
GstDevice ** changed_device)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_DEVICE_CHANGED);
if (device)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (DEVICE), GST_TYPE_DEVICE, device, NULL);
if (changed_device)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (DEVICE_CHANGED), GST_TYPE_DEVICE, changed_device, NULL);
}
/**
* gst_message_new_property_notify:
* @src: The #GstObject whose property changed (may or may not be a #GstElement)
* @property_name: name of the property that changed
* @val: (allow-none) (transfer full): new property value, or %NULL
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.10
*/
GstMessage *
gst_message_new_property_notify (GstObject * src, const gchar * property_name,
GValue * val)
{
GstStructure *structure;
GValue name_val = G_VALUE_INIT;
g_return_val_if_fail (property_name != NULL, NULL);
structure = gst_structure_new_id_empty (GST_QUARK (MESSAGE_PROPERTY_NOTIFY));
g_value_init (&name_val, G_TYPE_STRING);
/* should already be interned, but let's make sure */
g_value_set_static_string (&name_val, g_intern_string (property_name));
gst_structure_id_take_value (structure, GST_QUARK (PROPERTY_NAME), &name_val);
if (val != NULL)
gst_structure_id_take_value (structure, GST_QUARK (PROPERTY_VALUE), val);
return gst_message_new_custom (GST_MESSAGE_PROPERTY_NOTIFY, src, structure);
}
/**
* gst_message_parse_property_notify:
* @message: a #GstMessage of type %GST_MESSAGE_PROPERTY_NOTIFY
* @object: (out) (allow-none) (transfer none): location where to store a
* pointer to the object whose property got changed, or %NULL
* @property_name: (out) (transfer none) (allow-none): return location for
* the name of the property that got changed, or %NULL
* @property_value: (out) (transfer none) (allow-none): return location for
* the new value of the property that got changed, or %NULL. This will
* only be set if the property notify watch was told to include the value
* when it was set up
*
* Parses a property-notify message. These will be posted on the bus only
* when set up with gst_element_add_property_notify_watch() or
* gst_element_add_property_deep_notify_watch().
*
* Since: 1.10
*/
void
gst_message_parse_property_notify (GstMessage * message, GstObject ** object,
const gchar ** property_name, const GValue ** property_value)
{
const GstStructure *s = GST_MESSAGE_STRUCTURE (message);
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_PROPERTY_NOTIFY);
if (object)
*object = GST_MESSAGE_SRC (message);
if (property_name) {
const GValue *name_value;
name_value = gst_structure_id_get_value (s, GST_QUARK (PROPERTY_NAME));
*property_name = g_value_get_string (name_value);
}
if (property_value)
*property_value =
gst_structure_id_get_value (s, GST_QUARK (PROPERTY_VALUE));
}
/**
* gst_message_new_stream_collection:
* @src: The #GstObject that created the message
* @collection: (transfer none): The #GstStreamCollection
*
* Creates a new stream-collection message. The message is used to announce new
* #GstStreamCollection
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.10
*/
GstMessage *
gst_message_new_stream_collection (GstObject * src,
GstStreamCollection * collection)
{
GstMessage *message;
GstStructure *structure;
g_return_val_if_fail (collection != NULL, NULL);
g_return_val_if_fail (GST_IS_STREAM_COLLECTION (collection), NULL);
structure =
gst_structure_new_id (GST_QUARK (MESSAGE_STREAM_COLLECTION),
GST_QUARK (COLLECTION), GST_TYPE_STREAM_COLLECTION, collection, NULL);
message =
gst_message_new_custom (GST_MESSAGE_STREAM_COLLECTION, src, structure);
return message;
}
/**
* gst_message_parse_stream_collection:
* @message: a #GstMessage of type %GST_MESSAGE_STREAM_COLLECTION
* @collection: (out) (allow-none) (transfer full): A location where to store a
* pointer to the #GstStreamCollection, or %NULL
*
* Parses a stream-collection message.
*
* Since: 1.10
*/
void
gst_message_parse_stream_collection (GstMessage * message,
GstStreamCollection ** collection)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) ==
GST_MESSAGE_STREAM_COLLECTION);
if (collection)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (COLLECTION), GST_TYPE_STREAM_COLLECTION, collection, NULL);
}
/**
* gst_message_new_streams_selected:
* @src: The #GstObject that created the message
* @collection: (transfer none): The #GstStreamCollection
*
* Creates a new steams-selected message. The message is used to announce
* that an array of streams has been selected. This is generally in response
* to a #GST_EVENT_SELECT_STREAMS event, or when an element (such as decodebin3)
* makes an initial selection of streams.
*
* The message also contains the #GstStreamCollection to which the various streams
* belong to.
*
* Users of gst_message_new_streams_selected() can add the selected streams with
* gst_message_streams_selected_add().
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.10
*/
GstMessage *
gst_message_new_streams_selected (GstObject * src,
GstStreamCollection * collection)
{
GstMessage *message;
GstStructure *structure;
GValue val = G_VALUE_INIT;
g_return_val_if_fail (collection != NULL, NULL);
g_return_val_if_fail (GST_IS_STREAM_COLLECTION (collection), NULL);
structure =
gst_structure_new_id (GST_QUARK (MESSAGE_STREAMS_SELECTED),
GST_QUARK (COLLECTION), GST_TYPE_STREAM_COLLECTION, collection, NULL);
g_value_init (&val, GST_TYPE_ARRAY);
gst_structure_id_take_value (structure, GST_QUARK (STREAMS), &val);
message =
gst_message_new_custom (GST_MESSAGE_STREAMS_SELECTED, src, structure);
return message;
}
/**
* gst_message_streams_selected_get_size:
* @message: a #GstMessage of type %GST_MESSAGE_STREAMS_SELECTED
*
* Returns the number of streams contained in the @message.
*
* Returns: The number of streams contained within.
*
* Since: 1.10
*/
guint
gst_message_streams_selected_get_size (GstMessage * msg)
{
const GValue *val;
g_return_val_if_fail (GST_IS_MESSAGE (msg), 0);
g_return_val_if_fail (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_STREAMS_SELECTED,
0);
val =
gst_structure_id_get_value (GST_MESSAGE_STRUCTURE (msg),
GST_QUARK (STREAMS));
return gst_value_array_get_size (val);
}
/**
* gst_message_streams_selected_add:
* @message: a #GstMessage of type %GST_MESSAGE_STREAMS_SELECTED
* @stream: (transfer none): a #GstStream to add to @message
*
* Adds the @stream to the @message.
*
* Since: 1.10
*/
void
gst_message_streams_selected_add (GstMessage * msg, GstStream * stream)
{
GValue *val;
GValue to_add = G_VALUE_INIT;
g_return_if_fail (GST_IS_MESSAGE (msg));
g_return_if_fail (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_STREAMS_SELECTED);
g_return_if_fail (GST_IS_STREAM (stream));
val =
(GValue *) gst_structure_id_get_value (GST_MESSAGE_STRUCTURE (msg),
GST_QUARK (STREAMS));
g_value_init (&to_add, GST_TYPE_STREAM);
g_value_set_object (&to_add, stream);
gst_value_array_append_and_take_value (val, &to_add);
}
/**
* gst_message_streams_selected_get_stream:
* @message: a #GstMessage of type %GST_MESSAGE_STREAMS_SELECTED
* @idx: Index of the stream to retrieve
*
* Retrieves the #GstStream with index @index from the @message.
*
* Returns: (transfer full) (nullable): A #GstStream
*
* Since: 1.10
*/
GstStream *
gst_message_streams_selected_get_stream (GstMessage * msg, guint idx)
{
const GValue *streams, *val;
g_return_val_if_fail (GST_IS_MESSAGE (msg), NULL);
g_return_val_if_fail (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_STREAMS_SELECTED,
NULL);
streams =
gst_structure_id_get_value (GST_MESSAGE_STRUCTURE (msg),
GST_QUARK (STREAMS));
val = gst_value_array_get_value (streams, idx);
if (val) {
return (GstStream *) g_value_dup_object (val);
}
return NULL;
}
/**
* gst_message_parse_streams_selected:
* @message: a #GstMessage of type %GST_MESSAGE_STREAMS_SELECTED
* @collection: (out) (allow-none) (transfer full): A location where to store a
* pointer to the #GstStreamCollection, or %NULL
*
* Parses a streams-selected message.
*
* Since: 1.10
*/
void
gst_message_parse_streams_selected (GstMessage * message,
GstStreamCollection ** collection)
{
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_STREAMS_SELECTED);
if (collection)
gst_structure_id_get (GST_MESSAGE_STRUCTURE (message),
GST_QUARK (COLLECTION), GST_TYPE_STREAM_COLLECTION, collection, NULL);
}
/**
* gst_message_new_redirect:
* @src: The #GstObject whose property changed (may or may not be a #GstElement)
* @location: (transfer none): location string for the new entry
* @tag_list: (transfer full) (allow-none): tag list for the new entry
* @entry_struct: (transfer full) (allow-none): structure for the new entry
*
* Creates a new redirect message and adds a new entry to it. Redirect messages
* are posted when an element detects that the actual data has to be retrieved
* from a different location. This is useful if such a redirection cannot be
* handled inside a source element, for example when HTTP 302/303 redirects
* return a non-HTTP URL.
*
* The redirect message can hold multiple entries. The first one is added
* when the redirect message is created, with the given location, tag_list,
* entry_struct arguments. Use gst_message_add_redirect_entry() to add more
* entries.
*
* Each entry has a location, a tag list, and a structure. All of these are
* optional. The tag list and structure are useful for additional metadata,
* such as bitrate statistics for the given location.
*
* By default, message recipients should treat entries in the order they are
* stored. The recipient should therefore try entry #0 first, and if this
* entry is not acceptable or working, try entry #1 etc. Senders must make
* sure that they add entries in this order. However, recipients are free to
* ignore the order and pick an entry that is "best" for them. One example
* would be a recipient that scans the entries for the one with the highest
* bitrate tag.
*
* The specified location string is copied. However, ownership over the tag
* list and structure are transferred to the message.
*
* Returns: a newly allocated #GstMessage
*
* Since: 1.10
*/
GstMessage *
gst_message_new_redirect (GstObject * src, const gchar * location,
GstTagList * tag_list, const GstStructure * entry_struct)
{
GstStructure *structure;
GstMessage *message;
GValue entry_locations_gvalue = G_VALUE_INIT;
GValue entry_taglists_gvalue = G_VALUE_INIT;
GValue entry_structures_gvalue = G_VALUE_INIT;
g_return_val_if_fail (location != NULL, NULL);
g_value_init (&entry_locations_gvalue, GST_TYPE_LIST);
g_value_init (&entry_taglists_gvalue, GST_TYPE_LIST);
g_value_init (&entry_structures_gvalue, GST_TYPE_LIST);
structure = gst_structure_new_id_empty (GST_QUARK (MESSAGE_REDIRECT));
gst_structure_id_take_value (structure, GST_QUARK (REDIRECT_ENTRY_LOCATIONS),
&entry_locations_gvalue);
gst_structure_id_take_value (structure, GST_QUARK (REDIRECT_ENTRY_TAGLISTS),
&entry_taglists_gvalue);
gst_structure_id_take_value (structure, GST_QUARK (REDIRECT_ENTRY_STRUCTURES),
&entry_structures_gvalue);
message = gst_message_new_custom (GST_MESSAGE_REDIRECT, src, structure);
g_assert (message != NULL);
gst_message_add_redirect_entry (message, location, tag_list, entry_struct);
return message;
}
/**
* gst_message_add_redirect_entry:
* @message: a #GstMessage of type %GST_MESSAGE_REDIRECT
* @location: (transfer none): location string for the new entry
* @tag_list: (transfer full) (allow-none): tag list for the new entry
* @entry_struct: (transfer full) (allow-none): structure for the new entry
*
* Creates and appends a new entry.
*
* The specified location string is copied. However, ownership over the tag
* list and structure are transferred to the message.
*
* Since: 1.10
*/
void
gst_message_add_redirect_entry (GstMessage * message, const gchar * location,
GstTagList * tag_list, const GstStructure * entry_struct)
{
GValue val = G_VALUE_INIT;
GstStructure *structure;
GValue *entry_locations_gvalue;
GValue *entry_taglists_gvalue;
GValue *entry_structures_gvalue;
g_return_if_fail (location != NULL);
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_REDIRECT);
structure = GST_MESSAGE_STRUCTURE (message);
entry_locations_gvalue =
(GValue *) gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_LOCATIONS));
g_return_if_fail (GST_VALUE_HOLDS_LIST (entry_locations_gvalue));
entry_taglists_gvalue =
(GValue *) gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_TAGLISTS));
g_return_if_fail (GST_VALUE_HOLDS_LIST (entry_taglists_gvalue));
entry_structures_gvalue =
(GValue *) gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_STRUCTURES));
g_return_if_fail (GST_VALUE_HOLDS_LIST (entry_structures_gvalue));
g_value_init (&val, G_TYPE_STRING);
if (location)
g_value_set_string (&val, location);
gst_value_list_append_and_take_value (entry_locations_gvalue, &val);
g_value_init (&val, GST_TYPE_TAG_LIST);
if (tag_list)
g_value_take_boxed (&val, tag_list);
gst_value_list_append_and_take_value (entry_taglists_gvalue, &val);
g_value_init (&val, GST_TYPE_STRUCTURE);
if (entry_struct)
g_value_take_boxed (&val, entry_struct);
gst_value_list_append_and_take_value (entry_structures_gvalue, &val);
}
/**
* gst_message_parse_redirect_entry:
* @message: a #GstMessage of type %GST_MESSAGE_REDIRECT
* @entry_index: index of the entry to parse
* @location: (out) (transfer none) (allow-none): return location for
* the pointer to the entry's location string, or %NULL
* @tag_list: (out) (transfer none) (allow-none): return location for
* the pointer to the entry's tag list, or %NULL
* @entry_struct: (out) (transfer none) (allow-none): return location
* for the pointer to the entry's structure, or %NULL
*
* Parses the location and/or structure from the entry with the given index.
* The index must be between 0 and gst_message_get_num_redirect_entries() - 1.
* Returned pointers are valid for as long as this message exists.
*
* Since: 1.10
*/
void
gst_message_parse_redirect_entry (GstMessage * message, gsize entry_index,
const gchar ** location, GstTagList ** tag_list,
const GstStructure ** entry_struct)
{
const GValue *val;
GstStructure *structure;
const GValue *entry_locations_gvalue;
const GValue *entry_taglists_gvalue;
const GValue *entry_structures_gvalue;
g_return_if_fail (GST_IS_MESSAGE (message));
g_return_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_REDIRECT);
if (G_UNLIKELY (!location && !tag_list && !entry_struct))
return;
structure = GST_MESSAGE_STRUCTURE (message);
entry_locations_gvalue =
gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_LOCATIONS));
g_return_if_fail (GST_VALUE_HOLDS_LIST (entry_locations_gvalue));
entry_taglists_gvalue =
gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_TAGLISTS));
g_return_if_fail (GST_VALUE_HOLDS_LIST (entry_taglists_gvalue));
entry_structures_gvalue =
gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_STRUCTURES));
g_return_if_fail (GST_VALUE_HOLDS_LIST (entry_structures_gvalue));
if (location) {
val = gst_value_list_get_value (entry_locations_gvalue, entry_index);
g_return_if_fail (val != NULL);
*location = g_value_get_string (val);
}
if (tag_list) {
val = gst_value_list_get_value (entry_taglists_gvalue, entry_index);
g_return_if_fail (val != NULL);
*tag_list = (GstTagList *) g_value_get_boxed (val);
}
if (entry_struct) {
val = gst_value_list_get_value (entry_structures_gvalue, entry_index);
g_return_if_fail (val != NULL);
*entry_struct = (const GstStructure *) g_value_get_boxed (val);
}
}
/**
* gst_message_get_num_redirect_entries:
* @message: a #GstMessage of type %GST_MESSAGE_REDIRECT
*
* Returns: the number of entries stored in the message
*
* Since: 1.10
*/
gsize
gst_message_get_num_redirect_entries (GstMessage * message)
{
GstStructure *structure;
const GValue *entry_locations_gvalue;
const GValue *entry_taglists_gvalue;
const GValue *entry_structures_gvalue;
gsize size;
g_return_val_if_fail (GST_IS_MESSAGE (message), 0);
g_return_val_if_fail (GST_MESSAGE_TYPE (message) == GST_MESSAGE_REDIRECT, 0);
structure = GST_MESSAGE_STRUCTURE (message);
entry_locations_gvalue =
gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_LOCATIONS));
g_return_val_if_fail (GST_VALUE_HOLDS_LIST (entry_locations_gvalue), 0);
entry_taglists_gvalue =
gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_TAGLISTS));
g_return_val_if_fail (GST_VALUE_HOLDS_LIST (entry_taglists_gvalue), 0);
entry_structures_gvalue =
gst_structure_id_get_value (structure,
GST_QUARK (REDIRECT_ENTRY_STRUCTURES));
g_return_val_if_fail (GST_VALUE_HOLDS_LIST (entry_structures_gvalue), 0);
size = gst_value_list_get_size (entry_locations_gvalue);
g_return_val_if_fail ((size ==
gst_value_list_get_size (entry_structures_gvalue))
&& (size == gst_value_list_get_size (entry_taglists_gvalue)), 0);
return size;
}
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