gstreamer/gst/gststreamcollection.c

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/* GStreamer
*
* Copyright (C) 2015 Centricular Ltd
* @author: Edward Hervey <edward@centricular.com>
* @author: Jan Schmidt <jan@centricular.com>
*
* gststreams.c: GstStreamCollection object and methods
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* MT safe.
*/
/**
* SECTION:gststreamcollection
* @title: GstStreamCollection
* @short_description: Base class for collection of streams
*
* Since: 1.10
*/
#include "gst_private.h"
#include "gstenumtypes.h"
#include "gstevent.h"
#include "gststreamcollection.h"
GST_DEBUG_CATEGORY_STATIC (stream_collection_debug);
#define GST_CAT_DEFAULT stream_collection_debug
struct _GstStreamCollectionPrivate
{
/* Maybe switch this to a GArray if performance is
* ever an issue? */
GQueue streams;
};
/* stream signals and properties */
enum
{
SIG_STREAM_NOTIFY,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_UPSTREAM_ID,
PROP_LAST
};
static guint gst_stream_collection_signals[LAST_SIGNAL] = { 0 };
static void gst_stream_collection_dispose (GObject * object);
static void gst_stream_collection_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_stream_collection_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
proxy_stream_notify_cb (GstStream * stream, GParamSpec * pspec,
GstStreamCollection * collection);
#define _do_init \
{ \
GST_DEBUG_CATEGORY_INIT (stream_collection_debug, "streamcollection", GST_DEBUG_BOLD, \
"debugging info for the stream collection objects"); \
\
}
#define gst_stream_collection_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstStreamCollection, gst_stream_collection,
GST_TYPE_OBJECT, G_ADD_PRIVATE (GstStreamCollection) _do_init);
static void
gst_stream_collection_class_init (GstStreamCollectionClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_stream_collection_set_property;
gobject_class->get_property = gst_stream_collection_get_property;
/**
* GstStream:upstream-id:
*
* stream-id
*/
g_object_class_install_property (gobject_class, PROP_UPSTREAM_ID,
g_param_spec_string ("upstream-id", "Upstream ID",
"The stream ID of the parent stream",
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
/**
* GstStream::stream-notify:
* @collection: a #GstStreamCollection
* @prop_stream: the #GstStream that originated the signal
* @prop: the property that changed
*
* The stream notify signal is used to be notified of property changes to
* streams within the collection.
*/
gst_stream_collection_signals[SIG_STREAM_NOTIFY] =
g_signal_new ("stream-notify", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED |
G_SIGNAL_NO_HOOKS, G_STRUCT_OFFSET (GstStreamCollectionClass,
stream_notify), NULL, NULL, NULL, G_TYPE_NONE,
2, GST_TYPE_STREAM, G_TYPE_PARAM);
gobject_class->dispose = gst_stream_collection_dispose;
}
static void
gst_stream_collection_init (GstStreamCollection * collection)
{
collection->priv = gst_stream_collection_get_instance_private (collection);
g_queue_init (&collection->priv->streams);
}
static void
release_gst_stream (GstStream * stream, GstStreamCollection * collection)
{
g_signal_handlers_disconnect_by_func (stream,
proxy_stream_notify_cb, collection);
gst_object_unref (stream);
}
static void
gst_stream_collection_dispose (GObject * object)
{
GstStreamCollection *collection = GST_STREAM_COLLECTION_CAST (object);
if (collection->upstream_id) {
g_free (collection->upstream_id);
collection->upstream_id = NULL;
}
g_queue_foreach (&collection->priv->streams,
(GFunc) release_gst_stream, collection);
g_queue_clear (&collection->priv->streams);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
/**
* gst_stream_collection_new:
* @upstream_id: (allow-none): The stream id of the parent stream
*
* Create a new #GstStreamCollection.
*
* Returns: (transfer full): The new #GstStreamCollection.
*
* Since: 1.10
*/
GstStreamCollection *
gst_stream_collection_new (const gchar * upstream_id)
{
GstStreamCollection *collection;
collection =
g_object_new (GST_TYPE_STREAM_COLLECTION, "upstream-id", upstream_id,
NULL);
/* Clear floating flag */
g_object_ref_sink (collection);
return collection;
}
static void
gst_stream_collection_set_upstream_id (GstStreamCollection * collection,
const gchar * upstream_id)
{
g_return_if_fail (collection->upstream_id == NULL);
/* Upstream ID should only be set once on construction, but let's
* not leak in case someone does something silly */
if (collection->upstream_id)
g_free (collection->upstream_id);
if (upstream_id)
collection->upstream_id = g_strdup (upstream_id);
}
/**
* gst_stream_collection_get_upstream_id:
* @collection: a #GstStreamCollection
*
* Returns the upstream id of the @collection.
*
* Returns: (transfer none) (nullable): The upstream id
*
* Since: 1.10
*/
const gchar *
gst_stream_collection_get_upstream_id (GstStreamCollection * collection)
{
const gchar *res;
res = collection->upstream_id;
return res;
}
static void
gst_stream_collection_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstStreamCollection *collection;
collection = GST_STREAM_COLLECTION_CAST (object);
switch (prop_id) {
case PROP_UPSTREAM_ID:
gst_stream_collection_set_upstream_id (collection,
g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_stream_collection_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstStreamCollection *collection;
collection = GST_STREAM_COLLECTION_CAST (object);
switch (prop_id) {
case PROP_UPSTREAM_ID:
g_value_set_string (value,
gst_stream_collection_get_upstream_id (collection));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
proxy_stream_notify_cb (GstStream * stream, GParamSpec * pspec,
GstStreamCollection * collection)
{
GST_DEBUG_OBJECT (collection, "Stream %" GST_PTR_FORMAT " updated %s",
stream, pspec->name);
g_signal_emit (collection, gst_stream_collection_signals[SIG_STREAM_NOTIFY],
g_quark_from_string (pspec->name), stream, pspec);
}
/**
* gst_stream_collection_add_stream:
* @collection: a #GstStreamCollection
* @stream: (transfer full): the #GstStream to add
*
* Add the given @stream to the @collection.
*
* Returns: %TRUE if the @stream was properly added, else %FALSE
*
* Since: 1.10
*/
gboolean
gst_stream_collection_add_stream (GstStreamCollection * collection,
GstStream * stream)
{
g_return_val_if_fail (GST_IS_STREAM_COLLECTION (collection), FALSE);
g_return_val_if_fail (GST_IS_STREAM (stream), FALSE);
GST_DEBUG_OBJECT (collection, "Adding stream %" GST_PTR_FORMAT, stream);
g_queue_push_tail (&collection->priv->streams, stream);
g_signal_connect (stream, "notify", (GCallback) proxy_stream_notify_cb,
collection);
return TRUE;
}
/**
* gst_stream_collection_get_size:
* @collection: a #GstStreamCollection
*
* Get the number of streams this collection contains
*
* Returns: The number of streams that @collection contains
*
* Since: 1.10
*/
guint
gst_stream_collection_get_size (GstStreamCollection * collection)
{
g_return_val_if_fail (GST_IS_STREAM_COLLECTION (collection), 0);
return g_queue_get_length (&collection->priv->streams);
}
/**
* gst_stream_collection_get_stream:
* @collection: a #GstStreamCollection
* @index: Index of the stream to retrieve
*
* Retrieve the #GstStream with index @index from the collection.
*
* The caller should not modify the returned #GstStream
*
* Returns: (transfer none) (nullable): A #GstStream
*
* Since: 1.10
*/
GstStream *
gst_stream_collection_get_stream (GstStreamCollection * collection, guint index)
{
g_return_val_if_fail (GST_IS_STREAM_COLLECTION (collection), NULL);
return g_queue_peek_nth (&collection->priv->streams, index);
}