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10f038d4fb
Revive message in dispose handler before we signal the bus thread, otherwise the bus thread might be woken up and unref the message before we had a chance to revive it yet.
2451 lines
75 KiB
C
2451 lines
75 KiB
C
/* GStreamer
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
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*
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* gstmessage.c: GstMessage subsystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstmessage
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* @short_description: Lightweight objects to signal the application of
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* pipeline events
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* @see_also: #GstBus, #GstMiniObject, #GstElement
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*
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* Messages are implemented as a subclass of #GstMiniObject with a generic
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* #GstStructure as the content. This allows for writing custom messages without
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* requiring an API change while allowing a wide range of different types
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* of messages.
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*
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* Messages are posted by objects in the pipeline and are passed to the
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* application using the #GstBus.
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*
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* The basic use pattern of posting a message on a #GstBus is as follows:
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* |[
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* gst_bus_post (bus, gst_message_new_eos());
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* ]|
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*
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* A #GstElement usually posts messages on the bus provided by the parent
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* container using gst_element_post_message().
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*/
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#include "gst_private.h"
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#include <string.h> /* memcpy */
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#include "gsterror.h"
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#include "gstenumtypes.h"
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#include "gstinfo.h"
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#include "gstmessage.h"
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#include "gsttaglist.h"
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#include "gstutils.h"
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#include "gstquark.h"
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typedef struct
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{
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GstMessage message;
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GstStructure *structure;
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} GstMessageImpl;
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#define GST_MESSAGE_STRUCTURE(m) (((GstMessageImpl *)(m))->structure)
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typedef struct
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{
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const gint type;
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const gchar *name;
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GQuark quark;
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} GstMessageQuarks;
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static GstMessageQuarks message_quarks[] = {
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{GST_MESSAGE_UNKNOWN, "unknown", 0},
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{GST_MESSAGE_EOS, "eos", 0},
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{GST_MESSAGE_ERROR, "error", 0},
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{GST_MESSAGE_WARNING, "warning", 0},
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{GST_MESSAGE_INFO, "info", 0},
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{GST_MESSAGE_TAG, "tag", 0},
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{GST_MESSAGE_BUFFERING, "buffering", 0},
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{GST_MESSAGE_STATE_CHANGED, "state-changed", 0},
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{GST_MESSAGE_STATE_DIRTY, "state-dirty", 0},
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{GST_MESSAGE_STEP_DONE, "step-done", 0},
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{GST_MESSAGE_CLOCK_PROVIDE, "clock-provide", 0},
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{GST_MESSAGE_CLOCK_LOST, "clock-lost", 0},
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{GST_MESSAGE_NEW_CLOCK, "new-clock", 0},
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{GST_MESSAGE_STRUCTURE_CHANGE, "structure-change", 0},
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{GST_MESSAGE_STREAM_STATUS, "stream-status", 0},
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{GST_MESSAGE_APPLICATION, "application", 0},
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{GST_MESSAGE_ELEMENT, "element", 0},
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{GST_MESSAGE_SEGMENT_START, "segment-start", 0},
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{GST_MESSAGE_SEGMENT_DONE, "segment-done", 0},
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{GST_MESSAGE_DURATION_CHANGED, "duration-changed", 0},
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{GST_MESSAGE_LATENCY, "latency", 0},
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{GST_MESSAGE_ASYNC_START, "async-start", 0},
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{GST_MESSAGE_ASYNC_DONE, "async-done", 0},
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{GST_MESSAGE_REQUEST_STATE, "request-state", 0},
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{GST_MESSAGE_STEP_START, "step-start", 0},
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{GST_MESSAGE_QOS, "qos", 0},
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{GST_MESSAGE_PROGRESS, "progress", 0},
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{GST_MESSAGE_TOC, "toc", 0},
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{GST_MESSAGE_RESET_TIME, "reset-time", 0},
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{GST_MESSAGE_STREAM_START, "stream-start", 0},
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{GST_MESSAGE_NEED_CONTEXT, "need-context", 0},
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{GST_MESSAGE_HAVE_CONTEXT, "have-context", 0},
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{GST_MESSAGE_DEVICE_ADDED, "device-added", 0},
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{GST_MESSAGE_DEVICE_REMOVED, "device-removed", 0},
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{0, NULL, 0}
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};
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GType _gst_message_type = 0;
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GST_DEFINE_MINI_OBJECT_TYPE (GstMessage, gst_message);
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void
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_priv_gst_message_initialize (void)
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{
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gint i;
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GST_CAT_INFO (GST_CAT_GST_INIT, "init messages");
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for (i = 0; message_quarks[i].name; i++) {
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message_quarks[i].quark =
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g_quark_from_static_string (message_quarks[i].name);
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}
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_gst_message_type = gst_message_get_type ();
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}
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/**
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* gst_message_type_get_name:
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* @type: the message type
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*
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* Get a printable name for the given message type. Do not modify or free.
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*
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* Returns: a reference to the static name of the message.
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*/
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const gchar *
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gst_message_type_get_name (GstMessageType type)
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{
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gint i;
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for (i = 0; message_quarks[i].name; i++) {
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if (type == message_quarks[i].type)
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return message_quarks[i].name;
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}
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return "unknown";
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}
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/**
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* gst_message_type_to_quark:
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* @type: the message type
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*
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* Get the unique quark for the given message type.
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*
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* Returns: the quark associated with the message type
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*/
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GQuark
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gst_message_type_to_quark (GstMessageType type)
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{
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gint i;
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for (i = 0; message_quarks[i].name; i++) {
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if (type == message_quarks[i].type)
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return message_quarks[i].quark;
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}
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return 0;
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}
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static gboolean
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_gst_message_dispose (GstMessage * message)
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{
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gboolean do_free = TRUE;
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if (GST_MINI_OBJECT_FLAG_IS_SET (message, GST_MESSAGE_FLAG_ASYNC_DELIVERY)) {
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/* revive message, so bus can finish with it and clean it up */
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gst_message_ref (message);
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GST_INFO ("[msg %p] signalling async free", message);
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GST_MESSAGE_LOCK (message);
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GST_MESSAGE_SIGNAL (message);
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GST_MESSAGE_UNLOCK (message);
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/* don't free it yet, let bus finish with it first */
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do_free = FALSE;
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}
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return do_free;
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}
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static void
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_gst_message_free (GstMessage * message)
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{
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GstStructure *structure;
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g_return_if_fail (message != NULL);
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GST_CAT_LOG (GST_CAT_MESSAGE, "finalize message %p, %s from %s", message,
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GST_MESSAGE_TYPE_NAME (message), GST_MESSAGE_SRC_NAME (message));
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if (GST_MESSAGE_SRC (message)) {
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gst_object_unref (GST_MESSAGE_SRC (message));
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GST_MESSAGE_SRC (message) = NULL;
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}
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structure = GST_MESSAGE_STRUCTURE (message);
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if (structure) {
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gst_structure_set_parent_refcount (structure, NULL);
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gst_structure_free (structure);
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}
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g_slice_free1 (sizeof (GstMessageImpl), message);
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}
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static void
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gst_message_init (GstMessageImpl * message, GstMessageType type,
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GstObject * src);
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static GstMessage *
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_gst_message_copy (GstMessage * message)
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{
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GstMessageImpl *copy;
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GstStructure *structure;
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GST_CAT_LOG (GST_CAT_MESSAGE, "copy message %p, %s from %s", message,
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GST_MESSAGE_TYPE_NAME (message),
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GST_OBJECT_NAME (GST_MESSAGE_SRC (message)));
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copy = g_slice_new0 (GstMessageImpl);
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gst_message_init (copy, GST_MESSAGE_TYPE (message),
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GST_MESSAGE_SRC (message));
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GST_MESSAGE_TIMESTAMP (copy) = GST_MESSAGE_TIMESTAMP (message);
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GST_MESSAGE_SEQNUM (copy) = GST_MESSAGE_SEQNUM (message);
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structure = GST_MESSAGE_STRUCTURE (message);
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if (structure) {
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GST_MESSAGE_STRUCTURE (copy) = gst_structure_copy (structure);
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gst_structure_set_parent_refcount (GST_MESSAGE_STRUCTURE (copy),
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©->message.mini_object.refcount);
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} else {
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GST_MESSAGE_STRUCTURE (copy) = NULL;
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}
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return GST_MESSAGE_CAST (copy);
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}
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static void
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gst_message_init (GstMessageImpl * message, GstMessageType type,
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GstObject * src)
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{
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gst_mini_object_init (GST_MINI_OBJECT_CAST (message), 0, _gst_message_type,
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(GstMiniObjectCopyFunction) _gst_message_copy,
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(GstMiniObjectDisposeFunction) _gst_message_dispose,
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(GstMiniObjectFreeFunction) _gst_message_free);
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GST_MESSAGE_TYPE (message) = type;
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if (src)
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gst_object_ref (src);
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GST_MESSAGE_SRC (message) = src;
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GST_MESSAGE_TIMESTAMP (message) = GST_CLOCK_TIME_NONE;
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GST_MESSAGE_SEQNUM (message) = gst_util_seqnum_next ();
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}
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/**
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* gst_message_new_custom:
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* @type: The #GstMessageType to distinguish messages
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* @src: The object originating the message.
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* @structure: (transfer full) (allow-none): the structure for the
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* message. The message will take ownership of the structure.
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*
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* Create a new custom-typed message. This can be used for anything not
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* handled by other message-specific functions to pass a message to the
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* app. The structure field can be %NULL.
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*
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* Returns: (transfer full): The new message.
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*
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* MT safe.
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*/
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GstMessage *
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gst_message_new_custom (GstMessageType type, GstObject * src,
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GstStructure * structure)
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{
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GstMessageImpl *message;
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message = g_slice_new0 (GstMessageImpl);
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GST_CAT_LOG (GST_CAT_MESSAGE, "source %s: creating new message %p %s",
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(src ? GST_OBJECT_NAME (src) : "NULL"), message,
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gst_message_type_get_name (type));
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if (structure) {
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/* structure must not have a parent */
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if (!gst_structure_set_parent_refcount (structure,
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&message->message.mini_object.refcount))
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goto had_parent;
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}
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gst_message_init (message, type, src);
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GST_MESSAGE_STRUCTURE (message) = structure;
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return GST_MESSAGE_CAST (message);
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/* ERRORS */
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had_parent:
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{
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g_slice_free1 (sizeof (GstMessageImpl), message);
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g_warning ("structure is already owned by another object");
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return NULL;
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}
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}
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/**
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* gst_message_get_seqnum:
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* @message: A #GstMessage.
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*
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* Retrieve the sequence number of a message.
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*
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* Messages have ever-incrementing sequence numbers, which may also be set
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* explicitly via gst_message_set_seqnum(). Sequence numbers are typically used
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* to indicate that a message corresponds to some other set of messages or
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* events, for example a SEGMENT_DONE message corresponding to a SEEK event. It
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* is considered good practice to make this correspondence when possible, though
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* it is not required.
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*
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* Note that events and messages share the same sequence number incrementor;
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* two events or messages will never have the same sequence number unless
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* that correspondence was made explicitly.
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*
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* Returns: The message's sequence number.
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*
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* MT safe.
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*/
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guint32
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gst_message_get_seqnum (GstMessage * message)
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{
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g_return_val_if_fail (GST_IS_MESSAGE (message), -1);
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return GST_MESSAGE_SEQNUM (message);
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}
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/**
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* gst_message_set_seqnum:
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* @message: A #GstMessage.
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* @seqnum: A sequence number.
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*
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* Set the sequence number of a message.
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*
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* This function might be called by the creator of a message to indicate that
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* the message relates to other messages or events. See gst_message_get_seqnum()
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* for more information.
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*
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* MT safe.
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*/
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void
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gst_message_set_seqnum (GstMessage * message, guint32 seqnum)
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{
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g_return_if_fail (GST_IS_MESSAGE (message));
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GST_MESSAGE_SEQNUM (message) = seqnum;
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}
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/**
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* gst_message_new_eos:
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* @src: (transfer none): The object originating the message.
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*
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* Create a new eos message. This message is generated and posted in
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* the sink elements of a GstBin. The bin will only forward the EOS
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* message to the application if all sinks have posted an EOS message.
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*
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* Returns: (transfer full): The new eos message.
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*
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* MT safe.
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*/
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GstMessage *
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gst_message_new_eos (GstObject * src)
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{
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GstMessage *message;
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message = gst_message_new_custom (GST_MESSAGE_EOS, src, NULL);
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return message;
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}
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/**
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* gst_message_new_error:
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* @src: (transfer none): The object originating the message.
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* @error: (transfer none): The GError for this message.
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* @debug: A debugging string.
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*
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* Create a new error message. The message will copy @error and
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* @debug. This message is posted by element when a fatal event
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* occurred. The pipeline will probably (partially) stop. The application
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* receiving this message should stop the pipeline.
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*
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* Returns: (transfer full): the new error message.
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*
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* MT safe.
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*/
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GstMessage *
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gst_message_new_error (GstObject * src, GError * error, const gchar * debug)
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{
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GstMessage *message;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (MESSAGE_ERROR),
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GST_QUARK (GERROR), G_TYPE_ERROR, error,
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GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
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message = gst_message_new_custom (GST_MESSAGE_ERROR, src, structure);
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return message;
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}
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/**
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* gst_message_new_warning:
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* @src: (transfer none): The object originating the message.
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* @error: (transfer none): The GError for this message.
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* @debug: A debugging string.
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*
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* Create a new warning message. The message will make copies of @error and
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* @debug.
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*
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* Returns: (transfer full): The new warning message.
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*
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* MT safe.
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*/
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GstMessage *
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gst_message_new_warning (GstObject * src, GError * error, const gchar * debug)
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{
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GstMessage *message;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (MESSAGE_WARNING),
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GST_QUARK (GERROR), G_TYPE_ERROR, error,
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GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
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message = gst_message_new_custom (GST_MESSAGE_WARNING, src, structure);
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return message;
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}
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/**
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* gst_message_new_info:
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* @src: (transfer none): The object originating the message.
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* @error: (transfer none): The GError for this message.
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* @debug: A debugging string.
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*
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* Create a new info message. The message will make copies of @error and
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* @debug.
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*
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* MT safe.
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*
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* Returns: (transfer full): the new info message.
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*/
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GstMessage *
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gst_message_new_info (GstObject * src, GError * error, const gchar * debug)
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{
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GstMessage *message;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (MESSAGE_INFO),
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GST_QUARK (GERROR), G_TYPE_ERROR, error,
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GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
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message = gst_message_new_custom (GST_MESSAGE_INFO, src, structure);
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return message;
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}
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/**
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* gst_message_new_tag:
|
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* @src: (transfer none): The object originating the message.
|
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* @tag_list: (transfer full): the tag list for the message.
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*
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* Create a new tag message. The message will take ownership of the tag list.
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* The message is posted by elements that discovered a new taglist.
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*
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* Returns: (transfer full): the new tag message.
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*
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* MT safe.
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*/
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GstMessage *
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gst_message_new_tag (GstObject * src, GstTagList * tag_list)
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{
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GstStructure *s;
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GstMessage *message;
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GValue val = G_VALUE_INIT;
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g_return_val_if_fail (GST_IS_TAG_LIST (tag_list), NULL);
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s = gst_structure_new_id_empty (GST_QUARK (MESSAGE_TAG));
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g_value_init (&val, GST_TYPE_TAG_LIST);
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g_value_take_boxed (&val, tag_list);
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gst_structure_id_take_value (s, GST_QUARK (TAGLIST), &val);
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message = gst_message_new_custom (GST_MESSAGE_TAG, src, s);
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return message;
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}
|
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|
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/**
|
|
* gst_message_new_buffering:
|
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* @src: (transfer 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): 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): 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): 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): 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): 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): 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): 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): 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): 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): 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): 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): 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): 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): 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. Elements may post a duration message with a duration of
|
|
* GST_CLOCK_TIME_NONE to indicate that the duration has changed and the
|
|
* cached duration should be discarded. The new duration can then be
|
|
* retrieved via a query.
|
|
*
|
|
* Returns: (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): 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): 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): 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): 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): 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_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:
|
|
* |[
|
|
* ...
|
|
* switch (GST_MESSAGE_TYPE (msg)) {
|
|
* case GST_MESSAGE_TAG: {
|
|
* GstTagList *tags = NULL;
|
|
*
|
|
* gst_message_parse_tag (msg, &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_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:
|
|
* |[
|
|
* ...
|
|
* switch (GST_MESSAGE_TYPE (msg)) {
|
|
* case GST_MESSAGE_STATE_CHANGED: {
|
|
* GstState old_state, new_state;
|
|
*
|
|
* gst_message_parse_state_changed (msg, &old_state, &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:
|
|
* |[
|
|
* ...
|
|
* switch (GST_MESSAGE_TYPE (msg)) {
|
|
* case GST_MESSAGE_ERROR: {
|
|
* GError *err = NULL;
|
|
* gchar *dbg_info = NULL;
|
|
*
|
|
* gst_message_parse_error (msg, &err, &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: 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.
|
|
* @test should contain a user visible string detailing the current action.
|
|
*
|
|
* Returns: (transfer full): 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): 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): 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): 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) (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): 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 none): 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 none): 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);
|
|
}
|