gstreamer/gst/rtsp-server/rtsp-session.c

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/* GStreamer
* Copyright (C) 2008 Wim Taymans <wim.taymans at gmail.com>
*
* 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
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
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*/
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/**
* SECTION:rtsp-session
* @short_description: An object to manage media
* @see_also: #GstRTSPSessionPool, #GstRTSPSessionMedia, #GstRTSPMedia
*
* The #GstRTSPSession is identified by an id, unique in the
* #GstRTSPSessionPool that created the session and manages media and its
* configuration.
*
* A #GstRTSPSession has a timeout that can be retrieved with
* gst_rtsp_session_get_timeout(). You can check if the sessions is expired with
* gst_rtsp_session_is_expired(). gst_rtsp_session_touch() will reset the
* expiration counter of the session.
*
* When a client configures a media with SETUP, a session will be created to
* keep track of the configuration of that media. With
* gst_rtsp_session_manage_media(), the media is added to the managed media
* in the session. With gst_rtsp_session_release_media() the media can be
* released again from the session. Managed media is identified in the sessions
* with a url. Use gst_rtsp_session_get_media() to get the media that matches
* (part of) the given url.
*
* The media in a session can be iterated with gst_rtsp_session_filter().
*
* Last reviewed on 2013-07-11 (1.0.0)
*/
#include <string.h>
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#include "rtsp-session.h"
#define GST_RTSP_SESSION_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_RTSP_SESSION, GstRTSPSessionPrivate))
struct _GstRTSPSessionPrivate
{
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GMutex lock; /* protects everything but sessionid and create_time */
gchar *sessionid;
guint timeout;
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GTimeVal create_time; /* immutable */
GTimeVal last_access;
gint expire_count;
GList *medias;
};
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#undef DEBUG
#define DEFAULT_TIMEOUT 60
enum
{
PROP_0,
PROP_SESSIONID,
PROP_TIMEOUT,
PROP_LAST
};
GST_DEBUG_CATEGORY_STATIC (rtsp_session_debug);
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#define GST_CAT_DEFAULT rtsp_session_debug
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static void gst_rtsp_session_get_property (GObject * object, guint propid,
GValue * value, GParamSpec * pspec);
static void gst_rtsp_session_set_property (GObject * object, guint propid,
const GValue * value, GParamSpec * pspec);
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static void gst_rtsp_session_finalize (GObject * obj);
G_DEFINE_TYPE (GstRTSPSession, gst_rtsp_session, G_TYPE_OBJECT);
static void
gst_rtsp_session_class_init (GstRTSPSessionClass * klass)
{
GObjectClass *gobject_class;
g_type_class_add_private (klass, sizeof (GstRTSPSessionPrivate));
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gobject_class = G_OBJECT_CLASS (klass);
gobject_class->get_property = gst_rtsp_session_get_property;
gobject_class->set_property = gst_rtsp_session_set_property;
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gobject_class->finalize = gst_rtsp_session_finalize;
g_object_class_install_property (gobject_class, PROP_SESSIONID,
g_param_spec_string ("sessionid", "Sessionid", "the session id",
NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TIMEOUT,
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g_param_spec_uint ("timeout", "timeout",
"the timeout of the session (0 = never)", 0, G_MAXUINT,
DEFAULT_TIMEOUT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (rtsp_session_debug, "rtspsession", 0,
"GstRTSPSession");
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}
static void
gst_rtsp_session_init (GstRTSPSession * session)
{
GstRTSPSessionPrivate *priv = GST_RTSP_SESSION_GET_PRIVATE (session);
session->priv = priv;
g_mutex_init (&priv->lock);
priv->timeout = DEFAULT_TIMEOUT;
g_get_current_time (&priv->create_time);
gst_rtsp_session_touch (session);
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}
static void
gst_rtsp_session_finalize (GObject * obj)
{
GstRTSPSession *session;
GstRTSPSessionPrivate *priv;
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session = GST_RTSP_SESSION (obj);
priv = session->priv;
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GST_INFO ("finalize session %p", session);
/* free all media */
g_list_free_full (priv->medias, g_object_unref);
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/* free session id */
g_free (priv->sessionid);
g_mutex_clear (&priv->lock);
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G_OBJECT_CLASS (gst_rtsp_session_parent_class)->finalize (obj);
}
static void
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gst_rtsp_session_get_property (GObject * object, guint propid,
GValue * value, GParamSpec * pspec)
{
GstRTSPSession *session = GST_RTSP_SESSION (object);
GstRTSPSessionPrivate *priv = session->priv;
switch (propid) {
case PROP_SESSIONID:
g_value_set_string (value, priv->sessionid);
break;
case PROP_TIMEOUT:
g_value_set_uint (value, gst_rtsp_session_get_timeout (session));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, propid, pspec);
}
}
static void
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gst_rtsp_session_set_property (GObject * object, guint propid,
const GValue * value, GParamSpec * pspec)
{
GstRTSPSession *session = GST_RTSP_SESSION (object);
GstRTSPSessionPrivate *priv = session->priv;
switch (propid) {
case PROP_SESSIONID:
g_free (priv->sessionid);
priv->sessionid = g_value_dup_string (value);
break;
case PROP_TIMEOUT:
gst_rtsp_session_set_timeout (session, g_value_get_uint (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, propid, pspec);
}
}
/**
* gst_rtsp_session_manage_media:
* @sess: a #GstRTSPSession
* @path: the path for the media
* @media: (transfer full): a #GstRTSPMedia
*
* Manage the media object @obj in @sess. @path will be used to retrieve this
* media from the session with gst_rtsp_session_get_media().
*
* Ownership is taken from @media.
*
* Returns: (transfer none): a new @GstRTSPSessionMedia object.
*/
GstRTSPSessionMedia *
gst_rtsp_session_manage_media (GstRTSPSession * sess, const gchar * path,
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GstRTSPMedia * media)
{
GstRTSPSessionPrivate *priv;
GstRTSPSessionMedia *result;
GstRTSPMediaStatus status;
g_return_val_if_fail (GST_IS_RTSP_SESSION (sess), NULL);
g_return_val_if_fail (path != NULL, NULL);
g_return_val_if_fail (GST_IS_RTSP_MEDIA (media), NULL);
status = gst_rtsp_media_get_status (media);
g_return_val_if_fail (status == GST_RTSP_MEDIA_STATUS_PREPARED || status ==
GST_RTSP_MEDIA_STATUS_SUSPENDED, NULL);
priv = sess->priv;
result = gst_rtsp_session_media_new (path, media);
g_mutex_lock (&priv->lock);
priv->medias = g_list_prepend (priv->medias, result);
g_mutex_unlock (&priv->lock);
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GST_INFO ("manage new media %p in session %p", media, result);
return result;
}
/**
* gst_rtsp_session_release_media:
* @sess: a #GstRTSPSession
* @media: (transfer none): a #GstRTSPMedia
*
* Release the managed @media in @sess, freeing the memory allocated by it.
*
* Returns: %TRUE if there are more media session left in @sess.
*/
gboolean
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gst_rtsp_session_release_media (GstRTSPSession * sess,
GstRTSPSessionMedia * media)
{
GstRTSPSessionPrivate *priv;
GList *find;
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gboolean more;
g_return_val_if_fail (GST_IS_RTSP_SESSION (sess), FALSE);
g_return_val_if_fail (media != NULL, FALSE);
priv = sess->priv;
g_mutex_lock (&priv->lock);
find = g_list_find (priv->medias, media);
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if (find)
priv->medias = g_list_delete_link (priv->medias, find);
more = (priv->medias != NULL);
g_mutex_unlock (&priv->lock);
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if (find)
g_object_unref (media);
return more;
}
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/**
* gst_rtsp_session_get_media:
* @sess: a #GstRTSPSession
* @path: the path for the media
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* @matched: (out): the amount of matched characters
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*
* Get the session media for @path. @matched will contain the number of matched
* characters of @path.
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*
* Returns: (transfer none): the configuration for @path in @sess.
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*/
GstRTSPSessionMedia *
gst_rtsp_session_get_media (GstRTSPSession * sess, const gchar * path,
gint * matched)
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{
GstRTSPSessionPrivate *priv;
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GstRTSPSessionMedia *result;
GList *walk;
gint best;
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g_return_val_if_fail (GST_IS_RTSP_SESSION (sess), NULL);
g_return_val_if_fail (path != NULL, NULL);
priv = sess->priv;
result = NULL;
best = 0;
g_mutex_lock (&priv->lock);
for (walk = priv->medias; walk; walk = g_list_next (walk)) {
GstRTSPSessionMedia *test;
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test = (GstRTSPSessionMedia *) walk->data;
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/* find largest match */
if (gst_rtsp_session_media_matches (test, path, matched)) {
if (best < *matched) {
result = test;
best = *matched;
}
}
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}
g_mutex_unlock (&priv->lock);
*matched = best;
return result;
}
/**
* gst_rtsp_session_filter:
* @sess: a #GstRTSPSession
* @func: (scope call) (allow-none): a callback
* @user_data: (closure): user data passed to @func
*
* Call @func for each media in @sess. The result value of @func determines
* what happens to the media. @func will be called with @sess
* locked so no further actions on @sess can be performed from @func.
*
* If @func returns #GST_RTSP_FILTER_REMOVE, the media will be removed from
* @sess.
*
* If @func returns #GST_RTSP_FILTER_KEEP, the media will remain in @sess.
*
* If @func returns #GST_RTSP_FILTER_REF, the media will remain in @sess but
* will also be added with an additional ref to the result #GList of this
* function..
*
* When @func is %NULL, #GST_RTSP_FILTER_REF will be assumed for all media.
*
* Returns: (element-type GstRTSPSessionMedia) (transfer full): a GList with all
* media for which @func returned #GST_RTSP_FILTER_REF. After usage, each
* element in the #GList should be unreffed before the list is freed.
*/
GList *
gst_rtsp_session_filter (GstRTSPSession * sess,
GstRTSPSessionFilterFunc func, gpointer user_data)
{
GstRTSPSessionPrivate *priv;
GList *result, *walk, *next;
g_return_val_if_fail (GST_IS_RTSP_SESSION (sess), NULL);
priv = sess->priv;
result = NULL;
g_mutex_lock (&priv->lock);
for (walk = priv->medias; walk; walk = next) {
GstRTSPSessionMedia *media = walk->data;
GstRTSPFilterResult res;
next = g_list_next (walk);
if (func)
res = func (sess, media, user_data);
else
res = GST_RTSP_FILTER_REF;
switch (res) {
case GST_RTSP_FILTER_REMOVE:
g_object_unref (media);
priv->medias = g_list_delete_link (priv->medias, walk);
break;
case GST_RTSP_FILTER_REF:
result = g_list_prepend (result, g_object_ref (media));
break;
case GST_RTSP_FILTER_KEEP:
default:
break;
}
}
g_mutex_unlock (&priv->lock);
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return result;
}
/**
* gst_rtsp_session_new:
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* @sessionid: a session id
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*
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* Create a new #GstRTSPSession instance with @sessionid.
*
* Returns: (transfer full): a new #GstRTSPSession
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*/
GstRTSPSession *
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gst_rtsp_session_new (const gchar * sessionid)
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{
GstRTSPSession *result;
g_return_val_if_fail (sessionid != NULL, NULL);
result = g_object_new (GST_TYPE_RTSP_SESSION, "sessionid", sessionid, NULL);
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return result;
}
/**
* gst_rtsp_session_get_sessionid:
* @session: a #GstRTSPSession
*
* Get the sessionid of @session.
*
* Returns: (transfer none): the sessionid of @session. The value remains valid
* as long as @session is alive.
*/
const gchar *
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gst_rtsp_session_get_sessionid (GstRTSPSession * session)
{
g_return_val_if_fail (GST_IS_RTSP_SESSION (session), NULL);
return session->priv->sessionid;
}
/**
* gst_rtsp_session_get_header:
* @session: a #GstRTSPSession
*
* Get the string that can be placed in the Session header field.
*
* Returns: (transfer full): the Session header of @session. g_free() after usage.
*/
gchar *
gst_rtsp_session_get_header (GstRTSPSession * session)
{
GstRTSPSessionPrivate *priv;
gchar *result;
g_return_val_if_fail (GST_IS_RTSP_SESSION (session), NULL);
priv = session->priv;
g_mutex_lock (&priv->lock);
if (priv->timeout != 60)
result = g_strdup_printf ("%s; timeout=%d", priv->sessionid, priv->timeout);
else
result = g_strdup (priv->sessionid);
g_mutex_unlock (&priv->lock);
return result;
}
/**
* gst_rtsp_session_set_timeout:
* @session: a #GstRTSPSession
* @timeout: the new timeout
*
* Configure @session for a timeout of @timeout seconds. The session will be
* cleaned up when there is no activity for @timeout seconds.
*/
void
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gst_rtsp_session_set_timeout (GstRTSPSession * session, guint timeout)
{
GstRTSPSessionPrivate *priv;
g_return_if_fail (GST_IS_RTSP_SESSION (session));
priv = session->priv;
g_mutex_lock (&priv->lock);
priv->timeout = timeout;
g_mutex_unlock (&priv->lock);
}
/**
* gst_rtsp_session_get_timeout:
* @session: a #GstRTSPSession
*
* Get the timeout value of @session.
*
* Returns: the timeout of @session in seconds.
*/
guint
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gst_rtsp_session_get_timeout (GstRTSPSession * session)
{
GstRTSPSessionPrivate *priv;
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guint res;
g_return_val_if_fail (GST_IS_RTSP_SESSION (session), 0);
priv = session->priv;
g_mutex_lock (&priv->lock);
res = priv->timeout;
g_mutex_unlock (&priv->lock);
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return res;
}
/**
* gst_rtsp_session_touch:
* @session: a #GstRTSPSession
*
* Update the last_access time of the session to the current time.
*/
void
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gst_rtsp_session_touch (GstRTSPSession * session)
{
GstRTSPSessionPrivate *priv;
g_return_if_fail (GST_IS_RTSP_SESSION (session));
priv = session->priv;
g_mutex_lock (&priv->lock);
g_get_current_time (&priv->last_access);
g_mutex_unlock (&priv->lock);
}
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/**
* gst_rtsp_session_prevent_expire:
* @session: a #GstRTSPSession
*
* Prevent @session from expiring.
*/
void
gst_rtsp_session_prevent_expire (GstRTSPSession * session)
{
g_return_if_fail (GST_IS_RTSP_SESSION (session));
g_atomic_int_add (&session->priv->expire_count, 1);
}
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/**
* gst_rtsp_session_allow_expire:
* @session: a #GstRTSPSession
*
* Allow @session to expire. This method must be called an equal
* amount of time as gst_rtsp_session_prevent_expire().
*/
void
gst_rtsp_session_allow_expire (GstRTSPSession * session)
{
g_atomic_int_add (&session->priv->expire_count, -1);
}
/**
* gst_rtsp_session_next_timeout:
* @session: a #GstRTSPSession
* @now: (transfer none): the current system time
*
* Get the amount of milliseconds till the session will expire.
*
* Returns: the amount of milliseconds since the session will time out.
*/
gint
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gst_rtsp_session_next_timeout (GstRTSPSession * session, GTimeVal * now)
{
GstRTSPSessionPrivate *priv;
gint res;
GstClockTime last_access, now_ns;
g_return_val_if_fail (GST_IS_RTSP_SESSION (session), -1);
g_return_val_if_fail (now != NULL, -1);
priv = session->priv;
g_mutex_lock (&priv->lock);
if (g_atomic_int_get (&priv->expire_count) != 0) {
/* touch session when the expire count is not 0 */
g_get_current_time (&priv->last_access);
}
last_access = GST_TIMEVAL_TO_TIME (priv->last_access);
/* add timeout allow for 5 seconds of extra time */
last_access += priv->timeout * GST_SECOND + (5 * GST_SECOND);
g_mutex_unlock (&priv->lock);
now_ns = GST_TIMEVAL_TO_TIME (*now);
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if (last_access > now_ns)
res = GST_TIME_AS_MSECONDS (last_access - now_ns);
else
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res = 0;
return res;
}
/**
* gst_rtsp_session_is_expired:
* @session: a #GstRTSPSession
* @now: (transfer none): the current system time
*
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* Check if @session timeout out.
*
* Returns: %TRUE if @session timed out
*/
gboolean
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gst_rtsp_session_is_expired (GstRTSPSession * session, GTimeVal * now)
{
gboolean res;
res = (gst_rtsp_session_next_timeout (session, now) == 0);
return res;
}