/* GStreamer * Copyright (C) <2007> Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include #include #include "gstrtpbin-marshal.h" #include "rtpsession.h" GST_DEBUG_CATEGORY_STATIC (rtp_session_debug); #define GST_CAT_DEFAULT rtp_session_debug /* signals and args */ enum { SIGNAL_GET_SOURCE_BY_SSRC, SIGNAL_ON_NEW_SSRC, SIGNAL_ON_SSRC_COLLISION, SIGNAL_ON_SSRC_VALIDATED, SIGNAL_ON_SSRC_ACTIVE, SIGNAL_ON_SSRC_SDES, SIGNAL_ON_BYE_SSRC, SIGNAL_ON_BYE_TIMEOUT, SIGNAL_ON_TIMEOUT, SIGNAL_ON_SENDER_TIMEOUT, LAST_SIGNAL }; #define DEFAULT_INTERNAL_SOURCE NULL #define DEFAULT_BANDWIDTH RTP_STATS_BANDWIDTH #define DEFAULT_RTCP_FRACTION RTP_STATS_RTCP_BANDWIDTH #define DEFAULT_RTCP_MTU 1400 #define DEFAULT_SDES NULL #define DEFAULT_NUM_SOURCES 0 #define DEFAULT_NUM_ACTIVE_SOURCES 0 #define DEFAULT_SOURCES NULL enum { PROP_0, PROP_INTERNAL_SSRC, PROP_INTERNAL_SOURCE, PROP_BANDWIDTH, PROP_RTCP_FRACTION, PROP_RTCP_MTU, PROP_SDES, PROP_NUM_SOURCES, PROP_NUM_ACTIVE_SOURCES, PROP_SOURCES, PROP_LAST }; /* update average packet size, we keep this scaled by 16 to keep enough * precision. */ #define UPDATE_AVG(avg, val) \ if ((avg) == 0) \ (avg) = (val) << 4; \ else \ (avg) = ((val) + (15 * (avg))) >> 4; /* The number RTCP intervals after which to timeout entries in the * collision table */ #define RTCP_INTERVAL_COLLISION_TIMEOUT 10 /* GObject vmethods */ static void rtp_session_finalize (GObject * object); static void rtp_session_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void rtp_session_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static guint rtp_session_signals[LAST_SIGNAL] = { 0 }; G_DEFINE_TYPE (RTPSession, rtp_session, G_TYPE_OBJECT); static RTPSource *obtain_source (RTPSession * sess, guint32 ssrc, gboolean * created, RTPArrivalStats * arrival, gboolean rtp); static GstFlowReturn rtp_session_schedule_bye_locked (RTPSession * sess, const gchar * reason, GstClockTime current_time); static GstClockTime calculate_rtcp_interval (RTPSession * sess, gboolean deterministic, gboolean first); static void rtp_session_class_init (RTPSessionClass * klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) klass; gobject_class->finalize = rtp_session_finalize; gobject_class->set_property = rtp_session_set_property; gobject_class->get_property = rtp_session_get_property; /** * RTPSession::get-source-by-ssrc: * @session: the object which received the signal * @ssrc: the SSRC of the RTPSource * * Request the #RTPSource object with SSRC @ssrc in @session. */ rtp_session_signals[SIGNAL_GET_SOURCE_BY_SSRC] = g_signal_new ("get-source-by-ssrc", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (RTPSessionClass, get_source_by_ssrc), NULL, NULL, gst_rtp_bin_marshal_OBJECT__UINT, RTP_TYPE_SOURCE, 1, G_TYPE_UINT); /** * RTPSession::on-new-ssrc: * @session: the object which received the signal * @src: the new RTPSource * * Notify of a new SSRC that entered @session. */ rtp_session_signals[SIGNAL_ON_NEW_SSRC] = g_signal_new ("on-new-ssrc", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_new_ssrc), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-ssrc-collision: * @session: the object which received the signal * @src: the #RTPSource that caused a collision * * Notify when we have an SSRC collision */ rtp_session_signals[SIGNAL_ON_SSRC_COLLISION] = g_signal_new ("on-ssrc-collision", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_ssrc_collision), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-ssrc-validated: * @session: the object which received the signal * @src: the new validated RTPSource * * Notify of a new SSRC that became validated. */ rtp_session_signals[SIGNAL_ON_SSRC_VALIDATED] = g_signal_new ("on-ssrc-validated", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_ssrc_validated), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-ssrc-active: * @session: the object which received the signal * @src: the active RTPSource * * Notify of a SSRC that is active, i.e., sending RTCP. */ rtp_session_signals[SIGNAL_ON_SSRC_ACTIVE] = g_signal_new ("on-ssrc-active", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_ssrc_active), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-ssrc-sdes: * @session: the object which received the signal * @src: the RTPSource * * Notify that a new SDES was received for SSRC. */ rtp_session_signals[SIGNAL_ON_SSRC_SDES] = g_signal_new ("on-ssrc-sdes", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_ssrc_sdes), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-bye-ssrc: * @session: the object which received the signal * @src: the RTPSource that went away * * Notify of an SSRC that became inactive because of a BYE packet. */ rtp_session_signals[SIGNAL_ON_BYE_SSRC] = g_signal_new ("on-bye-ssrc", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_bye_ssrc), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-bye-timeout: * @session: the object which received the signal * @src: the RTPSource that timed out * * Notify of an SSRC that has timed out because of BYE */ rtp_session_signals[SIGNAL_ON_BYE_TIMEOUT] = g_signal_new ("on-bye-timeout", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_bye_timeout), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-timeout: * @session: the object which received the signal * @src: the RTPSource that timed out * * Notify of an SSRC that has timed out */ rtp_session_signals[SIGNAL_ON_TIMEOUT] = g_signal_new ("on-timeout", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_timeout), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); /** * RTPSession::on-sender-timeout: * @session: the object which received the signal * @src: the RTPSource that timed out * * Notify of an SSRC that was a sender but timed out and became a receiver. */ rtp_session_signals[SIGNAL_ON_SENDER_TIMEOUT] = g_signal_new ("on-sender-timeout", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (RTPSessionClass, on_sender_timeout), NULL, NULL, g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, RTP_TYPE_SOURCE); g_object_class_install_property (gobject_class, PROP_INTERNAL_SSRC, g_param_spec_uint ("internal-ssrc", "Internal SSRC", "The internal SSRC used for the session", 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_INTERNAL_SOURCE, g_param_spec_object ("internal-source", "Internal Source", "The internal source element of the session", RTP_TYPE_SOURCE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_BANDWIDTH, g_param_spec_double ("bandwidth", "Bandwidth", "The bandwidth of the session", 0.0, G_MAXDOUBLE, DEFAULT_BANDWIDTH, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_RTCP_FRACTION, g_param_spec_double ("rtcp-fraction", "RTCP Fraction", "The fraction of the bandwidth used for RTCP", 0.0, G_MAXDOUBLE, DEFAULT_RTCP_FRACTION, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_RTCP_MTU, g_param_spec_uint ("rtcp-mtu", "RTCP MTU", "The maximum size of the RTCP packets", 16, G_MAXINT16, DEFAULT_RTCP_MTU, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_SDES, g_param_spec_boxed ("sdes", "SDES", "The SDES items of this session", GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_NUM_SOURCES, g_param_spec_uint ("num-sources", "Num Sources", "The number of sources in the session", 0, G_MAXUINT, DEFAULT_NUM_SOURCES, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_NUM_ACTIVE_SOURCES, g_param_spec_uint ("num-active-sources", "Num Active Sources", "The number of active sources in the session", 0, G_MAXUINT, DEFAULT_NUM_ACTIVE_SOURCES, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /** * RTPSource::sources * * Get a GValue Array of all sources in the session. * * * Getting the #RTPSources of a session * <programlisting> * { * GValueArray *arr; * GValue *val; * guint i; * * g_object_get (sess, "sources", &arr, NULL); * * for (i = 0; i < arr->n_values; i++) { * RTPSource *source; * * val = g_value_array_get_nth (arr, i); * source = g_value_get_object (val); * } * g_value_array_free (arr); * } * </programlisting> * </example> */ g_object_class_install_property (gobject_class, PROP_SOURCES, g_param_spec_boxed ("sources", "Sources", "An array of all known sources in the session", G_TYPE_VALUE_ARRAY, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); klass->get_source_by_ssrc = GST_DEBUG_FUNCPTR (rtp_session_get_source_by_ssrc); GST_DEBUG_CATEGORY_INIT (rtp_session_debug, "rtpsession", 0, "RTP Session"); } static void rtp_session_init (RTPSession * sess) { gint i; gchar *str; sess->lock = g_mutex_new (); sess->key = g_random_int (); sess->mask_idx = 0; sess->mask = 0; for (i = 0; i < 32; i++) { sess->ssrcs[i] = g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify) g_object_unref); } sess->cnames = g_hash_table_new_full (NULL, NULL, g_free, NULL); rtp_stats_init_defaults (&sess->stats); /* create an active SSRC for this session manager */ sess->source = rtp_session_create_source (sess); sess->source->validated = TRUE; sess->source->internal = TRUE; sess->stats.active_sources++; /* default UDP header length */ sess->header_len = 28; sess->mtu = DEFAULT_RTCP_MTU; /* some default SDES entries */ str = g_strdup_printf ("%s@%s", g_get_user_name (), g_get_host_name ()); rtp_source_set_sdes_string (sess->source, GST_RTCP_SDES_CNAME, str); g_free (str); rtp_source_set_sdes_string (sess->source, GST_RTCP_SDES_NAME, g_get_real_name ()); rtp_source_set_sdes_string (sess->source, GST_RTCP_SDES_TOOL, "GStreamer"); sess->first_rtcp = TRUE; GST_DEBUG ("%p: session using SSRC: %08x", sess, sess->source->ssrc); } static void rtp_session_finalize (GObject * object) { RTPSession *sess; gint i; sess = RTP_SESSION_CAST (object); g_mutex_free (sess->lock); for (i = 0; i < 32; i++) g_hash_table_destroy (sess->ssrcs[i]); g_list_foreach (sess->conflicting_addresses, (GFunc) g_free, NULL); g_list_free (sess->conflicting_addresses); g_free (sess->bye_reason); g_hash_table_destroy (sess->cnames); g_object_unref (sess->source); G_OBJECT_CLASS (rtp_session_parent_class)->finalize (object); } static void copy_source (gpointer key, RTPSource * source, GValueArray * arr) { GValue value = { 0 }; g_value_init (&value, RTP_TYPE_SOURCE); g_value_take_object (&value, source); /* copies the value */ g_value_array_append (arr, &value); } static GValueArray * rtp_session_create_sources (RTPSession * sess) { GValueArray *res; guint size; RTP_SESSION_LOCK (sess); /* get number of elements in the table */ size = g_hash_table_size (sess->ssrcs[sess->mask_idx]); /* create the result value array */ res = g_value_array_new (size); /* and copy all values into the array */ g_hash_table_foreach (sess->ssrcs[sess->mask_idx], (GHFunc) copy_source, res); RTP_SESSION_UNLOCK (sess); return res; } static void rtp_session_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { RTPSession *sess; sess = RTP_SESSION (object); switch (prop_id) { case PROP_INTERNAL_SSRC: rtp_session_set_internal_ssrc (sess, g_value_get_uint (value)); break; case PROP_BANDWIDTH: rtp_session_set_bandwidth (sess, g_value_get_double (value)); break; case PROP_RTCP_FRACTION: rtp_session_set_rtcp_fraction (sess, g_value_get_double (value)); break; case PROP_RTCP_MTU: sess->mtu = g_value_get_uint (value); break; case PROP_SDES: rtp_session_set_sdes_struct (sess, g_value_get_boxed (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void rtp_session_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { RTPSession *sess; sess = RTP_SESSION (object); switch (prop_id) { case PROP_INTERNAL_SSRC: g_value_set_uint (value, rtp_session_get_internal_ssrc (sess)); break; case PROP_INTERNAL_SOURCE: g_value_take_object (value, rtp_session_get_internal_source (sess)); break; case PROP_BANDWIDTH: g_value_set_double (value, rtp_session_get_bandwidth (sess)); break; case PROP_RTCP_FRACTION: g_value_set_double (value, rtp_session_get_rtcp_fraction (sess)); break; case PROP_RTCP_MTU: g_value_set_uint (value, sess->mtu); break; case PROP_SDES: g_value_take_boxed (value, rtp_session_get_sdes_struct (sess)); break; case PROP_NUM_SOURCES: g_value_set_uint (value, rtp_session_get_num_sources (sess)); break; case PROP_NUM_ACTIVE_SOURCES: g_value_set_uint (value, rtp_session_get_num_active_sources (sess)); break; case PROP_SOURCES: g_value_take_boxed (value, rtp_session_create_sources (sess)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void on_new_ssrc (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_NEW_SSRC], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_ssrc_collision (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_SSRC_COLLISION], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_ssrc_validated (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_SSRC_VALIDATED], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_ssrc_active (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_SSRC_ACTIVE], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_ssrc_sdes (RTPSession * sess, RTPSource * source) { g_object_ref (source); GST_DEBUG ("SDES changed for SSRC %08x", source->ssrc); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_SSRC_SDES], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_bye_ssrc (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_BYE_SSRC], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_bye_timeout (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_BYE_TIMEOUT], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_timeout (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_TIMEOUT], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } static void on_sender_timeout (RTPSession * sess, RTPSource * source) { g_object_ref (source); RTP_SESSION_UNLOCK (sess); g_signal_emit (sess, rtp_session_signals[SIGNAL_ON_SENDER_TIMEOUT], 0, source); RTP_SESSION_LOCK (sess); g_object_unref (source); } /** * rtp_session_new: * * Create a new session object. * * Returns: a new #RTPSession. g_object_unref() after usage. */ RTPSession * rtp_session_new (void) { RTPSession *sess; sess = g_object_new (RTP_TYPE_SESSION, NULL); return sess; } /** * rtp_session_set_callbacks: * @sess: an #RTPSession * @callbacks: callbacks to configure * @user_data: user data passed in the callbacks * * Configure a set of callbacks to be notified of actions. */ void rtp_session_set_callbacks (RTPSession * sess, RTPSessionCallbacks * callbacks, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); if (callbacks->process_rtp) { sess->callbacks.process_rtp = callbacks->process_rtp; sess->process_rtp_user_data = user_data; } if (callbacks->send_rtp) { sess->callbacks.send_rtp = callbacks->send_rtp; sess->send_rtp_user_data = user_data; } if (callbacks->send_rtcp) { sess->callbacks.send_rtcp = callbacks->send_rtcp; sess->send_rtcp_user_data = user_data; } if (callbacks->sync_rtcp) { sess->callbacks.sync_rtcp = callbacks->sync_rtcp; sess->sync_rtcp_user_data = user_data; } if (callbacks->clock_rate) { sess->callbacks.clock_rate = callbacks->clock_rate; sess->clock_rate_user_data = user_data; } if (callbacks->reconsider) { sess->callbacks.reconsider = callbacks->reconsider; sess->reconsider_user_data = user_data; } } /** * rtp_session_set_process_rtp_callback: * @sess: an #RTPSession * @callback: callback to set * @user_data: user data passed in the callback * * Configure only the process_rtp callback to be notified of the process_rtp action. */ void rtp_session_set_process_rtp_callback (RTPSession * sess, RTPSessionProcessRTP callback, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); sess->callbacks.process_rtp = callback; sess->process_rtp_user_data = user_data; } /** * rtp_session_set_send_rtp_callback: * @sess: an #RTPSession * @callback: callback to set * @user_data: user data passed in the callback * * Configure only the send_rtp callback to be notified of the send_rtp action. */ void rtp_session_set_send_rtp_callback (RTPSession * sess, RTPSessionSendRTP callback, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); sess->callbacks.send_rtp = callback; sess->send_rtp_user_data = user_data; } /** * rtp_session_set_send_rtcp_callback: * @sess: an #RTPSession * @callback: callback to set * @user_data: user data passed in the callback * * Configure only the send_rtcp callback to be notified of the send_rtcp action. */ void rtp_session_set_send_rtcp_callback (RTPSession * sess, RTPSessionSendRTCP callback, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); sess->callbacks.send_rtcp = callback; sess->send_rtcp_user_data = user_data; } /** * rtp_session_set_sync_rtcp_callback: * @sess: an #RTPSession * @callback: callback to set * @user_data: user data passed in the callback * * Configure only the sync_rtcp callback to be notified of the sync_rtcp action. */ void rtp_session_set_sync_rtcp_callback (RTPSession * sess, RTPSessionSyncRTCP callback, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); sess->callbacks.sync_rtcp = callback; sess->sync_rtcp_user_data = user_data; } /** * rtp_session_set_clock_rate_callback: * @sess: an #RTPSession * @callback: callback to set * @user_data: user data passed in the callback * * Configure only the clock_rate callback to be notified of the clock_rate action. */ void rtp_session_set_clock_rate_callback (RTPSession * sess, RTPSessionClockRate callback, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); sess->callbacks.clock_rate = callback; sess->clock_rate_user_data = user_data; } /** * rtp_session_set_reconsider_callback: * @sess: an #RTPSession * @callback: callback to set * @user_data: user data passed in the callback * * Configure only the reconsider callback to be notified of the reconsider action. */ void rtp_session_set_reconsider_callback (RTPSession * sess, RTPSessionReconsider callback, gpointer user_data) { g_return_if_fail (RTP_IS_SESSION (sess)); sess->callbacks.reconsider = callback; sess->reconsider_user_data = user_data; } /** * rtp_session_set_bandwidth: * @sess: an #RTPSession * @bandwidth: the bandwidth allocated * * Set the session bandwidth in bytes per second. */ void rtp_session_set_bandwidth (RTPSession * sess, gdouble bandwidth) { g_return_if_fail (RTP_IS_SESSION (sess)); RTP_SESSION_LOCK (sess); sess->stats.bandwidth = bandwidth; RTP_SESSION_UNLOCK (sess); } /** * rtp_session_get_bandwidth: * @sess: an #RTPSession * * Get the session bandwidth. * * Returns: the session bandwidth. */ gdouble rtp_session_get_bandwidth (RTPSession * sess) { gdouble result; g_return_val_if_fail (RTP_IS_SESSION (sess), 0); RTP_SESSION_LOCK (sess); result = sess->stats.bandwidth; RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_set_rtcp_fraction: * @sess: an #RTPSession * @bandwidth: the RTCP bandwidth * * Set the bandwidth that should be used for RTCP * messages. */ void rtp_session_set_rtcp_fraction (RTPSession * sess, gdouble bandwidth) { g_return_if_fail (RTP_IS_SESSION (sess)); RTP_SESSION_LOCK (sess); sess->stats.rtcp_bandwidth = bandwidth; RTP_SESSION_UNLOCK (sess); } /** * rtp_session_get_rtcp_fraction: * @sess: an #RTPSession * * Get the session bandwidth used for RTCP. * * Returns: The bandwidth used for RTCP messages. */ gdouble rtp_session_get_rtcp_fraction (RTPSession * sess) { gdouble result; g_return_val_if_fail (RTP_IS_SESSION (sess), 0.0); RTP_SESSION_LOCK (sess); result = sess->stats.rtcp_bandwidth; RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_set_sdes_string: * @sess: an #RTPSession * @type: the type of the SDES item * @item: a null-terminated string to set. * * Store an SDES item of @type in @sess. * * Returns: %FALSE if the data was unchanged @type is invalid. */ gboolean rtp_session_set_sdes_string (RTPSession * sess, GstRTCPSDESType type, const gchar * item) { gboolean result; g_return_val_if_fail (RTP_IS_SESSION (sess), FALSE); RTP_SESSION_LOCK (sess); result = rtp_source_set_sdes_string (sess->source, type, item); RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_get_sdes_string: * @sess: an #RTPSession * @type: the type of the SDES item * * Get the SDES item of @type from @sess. * * Returns: a null-terminated copy of the SDES item or NULL when @type was not * valid. g_free() after usage. */ gchar * rtp_session_get_sdes_string (RTPSession * sess, GstRTCPSDESType type) { gchar *result; g_return_val_if_fail (RTP_IS_SESSION (sess), NULL); RTP_SESSION_LOCK (sess); result = rtp_source_get_sdes_string (sess->source, type); RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_get_sdes_struct: * @sess: an #RTSPSession * * Get the SDES data as a #GstStructure * * Returns: a GstStructure with SDES items for @sess. This function returns a * copy of the SDES structure, use gst_structure_free() after usage. */ GstStructure * rtp_session_get_sdes_struct (RTPSession * sess) { const GstStructure *sdes; GstStructure *result = NULL; g_return_val_if_fail (RTP_IS_SESSION (sess), NULL); RTP_SESSION_LOCK (sess); sdes = rtp_source_get_sdes_struct (sess->source); if (sdes) result = gst_structure_copy (sdes); RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_set_sdes_struct: * @sess: an #RTSPSession * @sdes: a #GstStructure * * Set the SDES data as a #GstStructure. This function makes a copy of @sdes. */ void rtp_session_set_sdes_struct (RTPSession * sess, const GstStructure * sdes) { g_return_if_fail (sdes); g_return_if_fail (RTP_IS_SESSION (sess)); RTP_SESSION_LOCK (sess); rtp_source_set_sdes_struct (sess->source, gst_structure_copy (sdes)); RTP_SESSION_UNLOCK (sess); } static GstFlowReturn source_push_rtp (RTPSource * source, gpointer data, RTPSession * session) { GstFlowReturn result = GST_FLOW_OK; if (source == session->source) { GST_LOG ("source %08x pushed sender RTP packet", source->ssrc); RTP_SESSION_UNLOCK (session); if (session->callbacks.send_rtp) result = session->callbacks.send_rtp (session, source, data, session->send_rtp_user_data); else { gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); } } else { GST_LOG ("source %08x pushed receiver RTP packet", source->ssrc); RTP_SESSION_UNLOCK (session); if (session->callbacks.process_rtp) result = session->callbacks.process_rtp (session, source, GST_BUFFER_CAST (data), session->process_rtp_user_data); else gst_buffer_unref (GST_BUFFER_CAST (data)); } RTP_SESSION_LOCK (session); return result; } static gint source_clock_rate (RTPSource * source, guint8 pt, RTPSession * session) { gint result; RTP_SESSION_UNLOCK (session); if (session->callbacks.clock_rate) result = session->callbacks.clock_rate (session, pt, session->clock_rate_user_data); else result = -1; RTP_SESSION_LOCK (session); GST_DEBUG ("got clock-rate %d for pt %d", result, pt); return result; } static RTPSourceCallbacks callbacks = { (RTPSourcePushRTP) source_push_rtp, (RTPSourceClockRate) source_clock_rate, }; /** * find_add_conflicting_addresses: * @sess: The session to check in * @arrival: The arrival stats for the buffer * * Checks if an address which has a conflict is already known, * otherwise remembers it to prevent loops. * * Returns: TRUE if it was a known conflict, FALSE otherwise */ static gboolean find_add_conflicting_addresses (RTPSession * sess, RTPArrivalStats * arrival) { GList *item; RTPConflictingAddress *new_conflict; for (item = g_list_first (sess->conflicting_addresses); item; item = g_list_next (item)) { RTPConflictingAddress *known_conflict = item->data; if (gst_netaddress_equal (&arrival->address, &known_conflict->address)) { known_conflict->time = arrival->time; return TRUE; } } new_conflict = g_new0 (RTPConflictingAddress, 1); memcpy (&new_conflict->address, &arrival->address, sizeof (GstNetAddress)); new_conflict->time = arrival->time; sess->conflicting_addresses = g_list_prepend (sess->conflicting_addresses, new_conflict); return FALSE; } static gboolean check_collision (RTPSession * sess, RTPSource * source, RTPArrivalStats * arrival, gboolean rtp) { /* If we have no arrival address, we can't do collision checking */ if (!arrival->have_address) return FALSE; if (sess->source != source) { /* This is not our local source, but lets check if two remote * source collide */ if (rtp) { if (source->have_rtp_from) { if (gst_netaddress_equal (&source->rtp_from, &arrival->address)) /* Address is the same */ return FALSE; } else { /* We don't already have a from address for RTP, just set it */ rtp_source_set_rtp_from (source, &arrival->address); return FALSE; } } else { if (source->have_rtcp_from) { if (gst_netaddress_equal (&source->rtcp_from, &arrival->address)) /* Address is the same */ return FALSE; } else { /* We don't already have a from address for RTCP, just set it */ rtp_source_set_rtcp_from (source, &arrival->address); return FALSE; } } /* We received RTP or RTCP from this source before but the network address * changed. In this case, we have third-party collision or loop */ GST_DEBUG ("we have a third-party collision or loop"); /* FIXME: Log 3rd party collision somehow * Maybe should be done in upper layer, only the SDES can tell us * if its a collision or a loop */ } else { /* This is sending with our ssrc, is it an address we already know */ if (find_add_conflicting_addresses (sess, arrival)) { /* Its a known conflict, its probably a loop, not a collision * lets just drop the incoming packet */ GST_DEBUG ("Our packets are being looped back to us, dropping"); } else { /* Its a new collision, lets change our SSRC */ GST_DEBUG ("Collision for SSRC %x", rtp_source_get_ssrc (source)); on_ssrc_collision (sess, source); rtp_session_schedule_bye_locked (sess, "SSRC Collision", arrival->time); sess->change_ssrc = TRUE; } } return TRUE; } /* must be called with the session lock, the returned source needs to be * unreffed after usage. */ static RTPSource * obtain_source (RTPSession * sess, guint32 ssrc, gboolean * created, RTPArrivalStats * arrival, gboolean rtp) { RTPSource *source; source = g_hash_table_lookup (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (ssrc)); if (source == NULL) { /* make new Source in probation and insert */ source = rtp_source_new (ssrc); /* for RTP packets we need to set the source in probation. Receiving RTCP * packets of an SSRC, on the other hand, is a strong indication that we * are dealing with a valid source. */ if (rtp) source->probation = RTP_DEFAULT_PROBATION; else source->probation = 0; /* store from address, if any */ if (arrival->have_address) { if (rtp) rtp_source_set_rtp_from (source, &arrival->address); else rtp_source_set_rtcp_from (source, &arrival->address); } /* configure a callback on the source */ rtp_source_set_callbacks (source, &callbacks, sess); g_hash_table_insert (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (ssrc), source); /* we have one more source now */ sess->total_sources++; *created = TRUE; } else { *created = FALSE; /* check for collision, this updates the address when not previously set */ if (check_collision (sess, source, arrival, rtp)) { return NULL; } } /* update last activity */ source->last_activity = arrival->time; if (rtp) source->last_rtp_activity = arrival->time; g_object_ref (source); return source; } /** * rtp_session_get_internal_source: * @sess: a #RTPSession * * Get the internal #RTPSource of @sess. * * Returns: The internal #RTPSource. g_object_unref() after usage. */ RTPSource * rtp_session_get_internal_source (RTPSession * sess) { RTPSource *result; g_return_val_if_fail (RTP_IS_SESSION (sess), NULL); result = g_object_ref (sess->source); return result; } /** * rtp_session_set_internal_ssrc: * @sess: a #RTPSession * @ssrc: an SSRC * * Set the SSRC of @sess to @ssrc. */ void rtp_session_set_internal_ssrc (RTPSession * sess, guint32 ssrc) { RTP_SESSION_LOCK (sess); if (ssrc != sess->source->ssrc) { g_hash_table_steal (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (sess->source->ssrc)); GST_DEBUG ("setting internal SSRC to %08x", ssrc); /* After this call, any receiver of the old SSRC either in RTP or RTCP * packets will timeout on the old SSRC, we could potentially schedule a * BYE RTCP for the old SSRC... */ sess->source->ssrc = ssrc; rtp_source_reset (sess->source); /* rehash with the new SSRC */ g_hash_table_insert (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (sess->source->ssrc), sess->source); } RTP_SESSION_UNLOCK (sess); g_object_notify (G_OBJECT (sess), "internal-ssrc"); } /** * rtp_session_get_internal_ssrc: * @sess: a #RTPSession * * Get the internal SSRC of @sess. * * Returns: The SSRC of the session. */ guint32 rtp_session_get_internal_ssrc (RTPSession * sess) { guint32 ssrc; RTP_SESSION_LOCK (sess); ssrc = sess->source->ssrc; RTP_SESSION_UNLOCK (sess); return ssrc; } /** * rtp_session_add_source: * @sess: a #RTPSession * @src: #RTPSource to add * * Add @src to @session. * * Returns: %TRUE on success, %FALSE if a source with the same SSRC already * existed in the session. */ gboolean rtp_session_add_source (RTPSession * sess, RTPSource * src) { gboolean result = FALSE; RTPSource *find; g_return_val_if_fail (RTP_IS_SESSION (sess), FALSE); g_return_val_if_fail (src != NULL, FALSE); RTP_SESSION_LOCK (sess); find = g_hash_table_lookup (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (src->ssrc)); if (find == NULL) { g_hash_table_insert (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (src->ssrc), src); /* we have one more source now */ sess->total_sources++; result = TRUE; } RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_get_num_sources: * @sess: an #RTPSession * * Get the number of sources in @sess. * * Returns: The number of sources in @sess. */ guint rtp_session_get_num_sources (RTPSession * sess) { guint result; g_return_val_if_fail (RTP_IS_SESSION (sess), FALSE); RTP_SESSION_LOCK (sess); result = sess->total_sources; RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_get_num_active_sources: * @sess: an #RTPSession * * Get the number of active sources in @sess. A source is considered active when * it has been validated and has not yet received a BYE RTCP message. * * Returns: The number of active sources in @sess. */ guint rtp_session_get_num_active_sources (RTPSession * sess) { guint result; g_return_val_if_fail (RTP_IS_SESSION (sess), 0); RTP_SESSION_LOCK (sess); result = sess->stats.active_sources; RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_get_source_by_ssrc: * @sess: an #RTPSession * @ssrc: an SSRC * * Find the source with @ssrc in @sess. * * Returns: a #RTPSource with SSRC @ssrc or NULL if the source was not found. * g_object_unref() after usage. */ RTPSource * rtp_session_get_source_by_ssrc (RTPSession * sess, guint32 ssrc) { RTPSource *result; g_return_val_if_fail (RTP_IS_SESSION (sess), NULL); RTP_SESSION_LOCK (sess); result = g_hash_table_lookup (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (ssrc)); if (result) g_object_ref (result); RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_get_source_by_cname: * @sess: a #RTPSession * @cname: an CNAME * * Find the source with @cname in @sess. * * Returns: a #RTPSource with CNAME @cname or NULL if the source was not found. * g_object_unref() after usage. */ RTPSource * rtp_session_get_source_by_cname (RTPSession * sess, const gchar * cname) { RTPSource *result; g_return_val_if_fail (RTP_IS_SESSION (sess), NULL); g_return_val_if_fail (cname != NULL, NULL); RTP_SESSION_LOCK (sess); result = g_hash_table_lookup (sess->cnames, cname); if (result) g_object_ref (result); RTP_SESSION_UNLOCK (sess); return result; } static guint32 rtp_session_create_new_ssrc (RTPSession * sess) { guint32 ssrc; while (TRUE) { ssrc = g_random_int (); /* see if it exists in the session, we're done if it doesn't */ if (g_hash_table_lookup (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (ssrc)) == NULL) break; } return ssrc; } /** * rtp_session_create_source: * @sess: an #RTPSession * * Create an #RTPSource for use in @sess. This function will create a source * with an ssrc that is currently not used by any participants in the session. * * Returns: an #RTPSource. */ RTPSource * rtp_session_create_source (RTPSession * sess) { guint32 ssrc; RTPSource *source; RTP_SESSION_LOCK (sess); ssrc = rtp_session_create_new_ssrc (sess); source = rtp_source_new (ssrc); rtp_source_set_callbacks (source, &callbacks, sess); /* we need an additional ref for the source in the hashtable */ g_object_ref (source); g_hash_table_insert (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (ssrc), source); /* we have one more source now */ sess->total_sources++; RTP_SESSION_UNLOCK (sess); return source; } /* update the RTPArrivalStats structure with the current time and other bits * about the current buffer we are handling. * This function is typically called when a validated packet is received. * This function should be called with the SESSION_LOCK */ static void update_arrival_stats (RTPSession * sess, RTPArrivalStats * arrival, gboolean rtp, GstBuffer * buffer, GstClockTime current_time, GstClockTime running_time, guint64 ntpnstime) { /* get time of arrival */ arrival->time = current_time; arrival->running_time = running_time; arrival->ntpnstime = ntpnstime; /* get packet size including header overhead */ arrival->bytes = GST_BUFFER_SIZE (buffer) + sess->header_len; if (rtp) { arrival->payload_len = gst_rtp_buffer_get_payload_len (buffer); } else { arrival->payload_len = 0; } /* for netbuffer we can store the IP address to check for collisions */ arrival->have_address = GST_IS_NETBUFFER (buffer); if (arrival->have_address) { GstNetBuffer *netbuf = (GstNetBuffer *) buffer; memcpy (&arrival->address, &netbuf->from, sizeof (GstNetAddress)); } } /** * rtp_session_process_rtp: * @sess: and #RTPSession * @buffer: an RTP buffer * @current_time: the current system time * @ntpnstime: the NTP arrival time in nanoseconds * * Process an RTP buffer in the session manager. This function takes ownership * of @buffer. * * Returns: a #GstFlowReturn. */ GstFlowReturn rtp_session_process_rtp (RTPSession * sess, GstBuffer * buffer, GstClockTime current_time, GstClockTime running_time, guint64 ntpnstime) { GstFlowReturn result; guint32 ssrc; RTPSource *source; gboolean created; gboolean prevsender, prevactive; RTPArrivalStats arrival; guint32 csrcs[16]; guint8 i, count; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR); if (!gst_rtp_buffer_validate (buffer)) goto invalid_packet; RTP_SESSION_LOCK (sess); /* update arrival stats */ update_arrival_stats (sess, &arrival, TRUE, buffer, current_time, running_time, ntpnstime); /* ignore more RTP packets when we left the session */ if (sess->source->received_bye) goto ignore; /* get SSRC and look up in session database */ ssrc = gst_rtp_buffer_get_ssrc (buffer); source = obtain_source (sess, ssrc, &created, &arrival, TRUE); if (!source) goto collision; prevsender = RTP_SOURCE_IS_SENDER (source); prevactive = RTP_SOURCE_IS_ACTIVE (source); /* copy available csrc for later */ count = gst_rtp_buffer_get_csrc_count (buffer); /* make sure to not overflow our array. An RTP buffer can maximally contain * 16 CSRCs */ count = MIN (count, 16); for (i = 0; i < count; i++) csrcs[i] = gst_rtp_buffer_get_csrc (buffer, i); /* let source process the packet */ result = rtp_source_process_rtp (source, buffer, &arrival); /* source became active */ if (prevactive != RTP_SOURCE_IS_ACTIVE (source)) { sess->stats.active_sources++; GST_DEBUG ("source: %08x became active, %d active sources", ssrc, sess->stats.active_sources); on_ssrc_validated (sess, source); } if (prevsender != RTP_SOURCE_IS_SENDER (source)) { sess->stats.sender_sources++; GST_DEBUG ("source: %08x became sender, %d sender sources", ssrc, sess->stats.sender_sources); } if (created) on_new_ssrc (sess, source); if (source->validated) { gboolean created; /* for validated sources, we add the CSRCs as well */ for (i = 0; i < count; i++) { guint32 csrc; RTPSource *csrc_src; csrc = csrcs[i]; /* get source */ csrc_src = obtain_source (sess, csrc, &created, &arrival, TRUE); if (!csrc_src) continue; if (created) { GST_DEBUG ("created new CSRC: %08x", csrc); rtp_source_set_as_csrc (csrc_src); if (RTP_SOURCE_IS_ACTIVE (csrc_src)) sess->stats.active_sources++; on_new_ssrc (sess, csrc_src); } g_object_unref (csrc_src); } } g_object_unref (source); RTP_SESSION_UNLOCK (sess); return result; /* ERRORS */ invalid_packet: { gst_buffer_unref (buffer); GST_DEBUG ("invalid RTP packet received"); return GST_FLOW_OK; } ignore: { gst_buffer_unref (buffer); RTP_SESSION_UNLOCK (sess); GST_DEBUG ("ignoring RTP packet because we are leaving"); return GST_FLOW_OK; } collision: { gst_buffer_unref (buffer); RTP_SESSION_UNLOCK (sess); GST_DEBUG ("ignoring packet because its collisioning"); return GST_FLOW_OK; } } static void rtp_session_process_rb (RTPSession * sess, RTPSource * source, GstRTCPPacket * packet, RTPArrivalStats * arrival) { guint count, i; count = gst_rtcp_packet_get_rb_count (packet); for (i = 0; i < count; i++) { guint32 ssrc, exthighestseq, jitter, lsr, dlsr; guint8 fractionlost; gint32 packetslost; gst_rtcp_packet_get_rb (packet, i, &ssrc, &fractionlost, &packetslost, &exthighestseq, &jitter, &lsr, &dlsr); GST_DEBUG ("RB %d: SSRC %08x, jitter %" G_GUINT32_FORMAT, i, ssrc, jitter); if (ssrc == sess->source->ssrc) { /* only deal with report blocks for our session, we update the stats of * the sender of the RTCP message. We could also compare our stats against * the other sender to see if we are better or worse. */ rtp_source_process_rb (source, arrival->time, fractionlost, packetslost, exthighestseq, jitter, lsr, dlsr); on_ssrc_active (sess, source); } } } /* A Sender report contains statistics about how the sender is doing. This * includes timing informataion such as the relation between RTP and NTP * timestamps and the number of packets/bytes it sent to us. * * In this report is also included a set of report blocks related to how this * sender is receiving data (in case we (or somebody else) is also sending stuff * to it). This info includes the packet loss, jitter and seqnum. It also * contains information to calculate the round trip time (LSR/DLSR). */ static void rtp_session_process_sr (RTPSession * sess, GstRTCPPacket * packet, RTPArrivalStats * arrival, gboolean * do_sync) { guint32 senderssrc, rtptime, packet_count, octet_count; guint64 ntptime; RTPSource *source; gboolean created, prevsender; gst_rtcp_packet_sr_get_sender_info (packet, &senderssrc, &ntptime, &rtptime, &packet_count, &octet_count); GST_DEBUG ("got SR packet: SSRC %08x, time %" GST_TIME_FORMAT, senderssrc, GST_TIME_ARGS (arrival->time)); source = obtain_source (sess, senderssrc, &created, arrival, FALSE); if (!source) return; /* don't try to do lip-sync for sources that sent a BYE */ if (rtp_source_received_bye (source)) *do_sync = FALSE; else *do_sync = TRUE; prevsender = RTP_SOURCE_IS_SENDER (source); /* first update the source */ rtp_source_process_sr (source, arrival->time, ntptime, rtptime, packet_count, octet_count); if (prevsender != RTP_SOURCE_IS_SENDER (source)) { sess->stats.sender_sources++; GST_DEBUG ("source: %08x became sender, %d sender sources", senderssrc, sess->stats.sender_sources); } if (created) on_new_ssrc (sess, source); rtp_session_process_rb (sess, source, packet, arrival); g_object_unref (source); } /* A receiver report contains statistics about how a receiver is doing. It * includes stuff like packet loss, jitter and the seqnum it received last. It * also contains info to calculate the round trip time. * * We are only interested in how the sender of this report is doing wrt to us. */ static void rtp_session_process_rr (RTPSession * sess, GstRTCPPacket * packet, RTPArrivalStats * arrival) { guint32 senderssrc; RTPSource *source; gboolean created; senderssrc = gst_rtcp_packet_rr_get_ssrc (packet); GST_DEBUG ("got RR packet: SSRC %08x", senderssrc); source = obtain_source (sess, senderssrc, &created, arrival, FALSE); if (!source) return; if (created) on_new_ssrc (sess, source); rtp_session_process_rb (sess, source, packet, arrival); g_object_unref (source); } /* Get SDES items and store them in the SSRC */ static void rtp_session_process_sdes (RTPSession * sess, GstRTCPPacket * packet, RTPArrivalStats * arrival) { guint items, i, j; gboolean more_items, more_entries; items = gst_rtcp_packet_sdes_get_item_count (packet); GST_DEBUG ("got SDES packet with %d items", items); more_items = gst_rtcp_packet_sdes_first_item (packet); i = 0; while (more_items) { guint32 ssrc; gboolean changed, created; RTPSource *source; GstStructure *sdes; ssrc = gst_rtcp_packet_sdes_get_ssrc (packet); GST_DEBUG ("item %d, SSRC %08x", i, ssrc); changed = FALSE; /* find src, no probation when dealing with RTCP */ source = obtain_source (sess, ssrc, &created, arrival, FALSE); if (!source) return; sdes = gst_structure_new ("application/x-rtp-source-sdes", NULL); more_entries = gst_rtcp_packet_sdes_first_entry (packet); j = 0; while (more_entries) { GstRTCPSDESType type; guint8 len; guint8 *data; gchar *name; gchar *value; gst_rtcp_packet_sdes_get_entry (packet, &type, &len, &data); GST_DEBUG ("entry %d, type %d, len %d, data %.*s", j, type, len, len, data); if (type == GST_RTCP_SDES_PRIV) { name = g_strndup ((const gchar *) &data[1], data[0]); len -= data[0] + 1; data += data[0] + 1; } else { name = g_strdup (gst_rtcp_sdes_type_to_name (type)); } value = g_strndup ((const gchar *) data, len); gst_structure_set (sdes, name, G_TYPE_STRING, value, NULL); g_free (name); g_free (value); more_entries = gst_rtcp_packet_sdes_next_entry (packet); j++; } /* takes ownership of sdes */ changed = rtp_source_set_sdes_struct (source, sdes); source->validated = TRUE; if (created) on_new_ssrc (sess, source); if (changed) on_ssrc_sdes (sess, source); g_object_unref (source); more_items = gst_rtcp_packet_sdes_next_item (packet); i++; } } /* BYE is sent when a client leaves the session */ static void rtp_session_process_bye (RTPSession * sess, GstRTCPPacket * packet, RTPArrivalStats * arrival) { guint count, i; gchar *reason; gboolean reconsider = FALSE; reason = gst_rtcp_packet_bye_get_reason (packet); GST_DEBUG ("got BYE packet (reason: %s)", GST_STR_NULL (reason)); count = gst_rtcp_packet_bye_get_ssrc_count (packet); for (i = 0; i < count; i++) { guint32 ssrc; RTPSource *source; gboolean created, prevactive, prevsender; guint pmembers, members; ssrc = gst_rtcp_packet_bye_get_nth_ssrc (packet, i); GST_DEBUG ("SSRC: %08x", ssrc); /* find src and mark bye, no probation when dealing with RTCP */ source = obtain_source (sess, ssrc, &created, arrival, FALSE); if (!source) return; /* store time for when we need to time out this source */ source->bye_time = arrival->time; prevactive = RTP_SOURCE_IS_ACTIVE (source); prevsender = RTP_SOURCE_IS_SENDER (source); /* let the source handle the rest */ rtp_source_process_bye (source, reason); pmembers = sess->stats.active_sources; if (prevactive && !RTP_SOURCE_IS_ACTIVE (source)) { sess->stats.active_sources--; GST_DEBUG ("source: %08x became inactive, %d active sources", ssrc, sess->stats.active_sources); } if (prevsender && !RTP_SOURCE_IS_SENDER (source)) { sess->stats.sender_sources--; GST_DEBUG ("source: %08x became non sender, %d sender sources", ssrc, sess->stats.sender_sources); } members = sess->stats.active_sources; if (!sess->source->received_bye && members < pmembers) { /* some members went away since the previous timeout estimate. * Perform reverse reconsideration but only when we are not scheduling a * BYE ourselves. */ if (arrival->time < sess->next_rtcp_check_time) { GstClockTime time_remaining; time_remaining = sess->next_rtcp_check_time - arrival->time; sess->next_rtcp_check_time = gst_util_uint64_scale (time_remaining, members, pmembers); GST_DEBUG ("reverse reconsideration %" GST_TIME_FORMAT, GST_TIME_ARGS (sess->next_rtcp_check_time)); sess->next_rtcp_check_time += arrival->time; /* mark pending reconsider. We only want to signal the reconsideration * once after we handled all the source in the bye packet */ reconsider = TRUE; } } if (created) on_new_ssrc (sess, source); on_bye_ssrc (sess, source); g_object_unref (source); } if (reconsider) { RTP_SESSION_UNLOCK (sess); /* notify app of reconsideration */ if (sess->callbacks.reconsider) sess->callbacks.reconsider (sess, sess->reconsider_user_data); RTP_SESSION_LOCK (sess); } g_free (reason); } static void rtp_session_process_app (RTPSession * sess, GstRTCPPacket * packet, RTPArrivalStats * arrival) { GST_DEBUG ("received APP"); } /** * rtp_session_process_rtcp: * @sess: and #RTPSession * @buffer: an RTCP buffer * @current_time: the current system time * * Process an RTCP buffer in the session manager. This function takes ownership * of @buffer. * * Returns: a #GstFlowReturn. */ GstFlowReturn rtp_session_process_rtcp (RTPSession * sess, GstBuffer * buffer, GstClockTime current_time) { GstRTCPPacket packet; gboolean more, is_bye = FALSE, do_sync = FALSE; RTPArrivalStats arrival; GstFlowReturn result = GST_FLOW_OK; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR); if (!gst_rtcp_buffer_validate (buffer)) goto invalid_packet; GST_DEBUG ("received RTCP packet"); RTP_SESSION_LOCK (sess); /* update arrival stats */ update_arrival_stats (sess, &arrival, FALSE, buffer, current_time, -1, -1); if (sess->sent_bye) goto ignore; /* make writable, we might want to change the buffer */ buffer = gst_buffer_make_metadata_writable (buffer); /* start processing the compound packet */ more = gst_rtcp_buffer_get_first_packet (buffer, &packet); while (more) { GstRTCPType type; type = gst_rtcp_packet_get_type (&packet); /* when we are leaving the session, we should ignore all non-BYE messages */ if (sess->source->received_bye && type != GST_RTCP_TYPE_BYE) { GST_DEBUG ("ignoring non-BYE RTCP packet because we are leaving"); goto next; } switch (type) { case GST_RTCP_TYPE_SR: rtp_session_process_sr (sess, &packet, &arrival, &do_sync); break; case GST_RTCP_TYPE_RR: rtp_session_process_rr (sess, &packet, &arrival); break; case GST_RTCP_TYPE_SDES: rtp_session_process_sdes (sess, &packet, &arrival); break; case GST_RTCP_TYPE_BYE: is_bye = TRUE; /* don't try to attempt lip-sync anymore for streams with a BYE */ do_sync = FALSE; rtp_session_process_bye (sess, &packet, &arrival); break; case GST_RTCP_TYPE_APP: rtp_session_process_app (sess, &packet, &arrival); break; default: GST_WARNING ("got unknown RTCP packet"); break; } next: more = gst_rtcp_packet_move_to_next (&packet); } /* if we are scheduling a BYE, we only want to count bye packets, else we * count everything */ if (sess->source->received_bye) { if (is_bye) { sess->stats.bye_members++; UPDATE_AVG (sess->stats.avg_rtcp_packet_size, arrival.bytes); } } else { /* keep track of average packet size */ UPDATE_AVG (sess->stats.avg_rtcp_packet_size, arrival.bytes); } RTP_SESSION_UNLOCK (sess); /* notify caller of sr packets in the callback */ if (do_sync && sess->callbacks.sync_rtcp) result = sess->callbacks.sync_rtcp (sess, sess->source, buffer, sess->sync_rtcp_user_data); else gst_buffer_unref (buffer); return result; /* ERRORS */ invalid_packet: { GST_DEBUG ("invalid RTCP packet received"); gst_buffer_unref (buffer); return GST_FLOW_OK; } ignore: { gst_buffer_unref (buffer); RTP_SESSION_UNLOCK (sess); GST_DEBUG ("ignoring RTP packet because we left"); return GST_FLOW_OK; } } /** * rtp_session_send_rtp: * @sess: an #RTPSession * @data: pointer to either an RTP buffer or a list of RTP buffers * @current_time: the current system time * @ntpnstime: the NTP time in nanoseconds of when this buffer was captured. * This is the buffer timestamp converted to NTP time. * * Send the RTP buffer in the session manager. This function takes ownership of * @buffer. * * Returns: a #GstFlowReturn. */ GstFlowReturn rtp_session_send_rtp (RTPSession * sess, gpointer data, gboolean is_list, GstClockTime current_time, guint64 ntpnstime) { GstFlowReturn result; RTPSource *source; gboolean prevsender; gboolean valid_packet; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); g_return_val_if_fail (is_list || GST_IS_BUFFER (data), GST_FLOW_ERROR); if (is_list) { valid_packet = gst_rtp_buffer_list_validate (GST_BUFFER_LIST_CAST (data)); } else { valid_packet = gst_rtp_buffer_validate (GST_BUFFER_CAST (data)); } if (!valid_packet) goto invalid_packet; GST_LOG ("received RTP %s for sending", is_list ? "list" : "packet"); RTP_SESSION_LOCK (sess); source = sess->source; /* update last activity */ source->last_rtp_activity = current_time; prevsender = RTP_SOURCE_IS_SENDER (source); /* we use our own source to send */ result = rtp_source_send_rtp (source, data, is_list, ntpnstime); if (RTP_SOURCE_IS_SENDER (source) && !prevsender) sess->stats.sender_sources++; RTP_SESSION_UNLOCK (sess); return result; /* ERRORS */ invalid_packet: { gst_mini_object_unref (GST_MINI_OBJECT_CAST (data)); GST_DEBUG ("invalid RTP packet received"); return GST_FLOW_OK; } } static GstClockTime calculate_rtcp_interval (RTPSession * sess, gboolean deterministic, gboolean first) { GstClockTime result; if (sess->source->received_bye) { result = rtp_stats_calculate_bye_interval (&sess->stats); } else { result = rtp_stats_calculate_rtcp_interval (&sess->stats, RTP_SOURCE_IS_SENDER (sess->source), first); } GST_DEBUG ("next deterministic interval: %" GST_TIME_FORMAT ", first %d", GST_TIME_ARGS (result), first); if (!deterministic) result = rtp_stats_add_rtcp_jitter (&sess->stats, result); GST_DEBUG ("next interval: %" GST_TIME_FORMAT, GST_TIME_ARGS (result)); return result; } /* Stop the current @sess and schedule a BYE message for the other members. * One must have the session lock to call this function */ static GstFlowReturn rtp_session_schedule_bye_locked (RTPSession * sess, const gchar * reason, GstClockTime current_time) { GstFlowReturn result = GST_FLOW_OK; RTPSource *source; GstClockTime interval; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); source = sess->source; /* ignore more BYEs */ if (source->received_bye) goto done; /* we have BYE now */ source->received_bye = TRUE; /* at least one member wants to send a BYE */ g_free (sess->bye_reason); sess->bye_reason = g_strdup (reason); sess->stats.avg_rtcp_packet_size = 100; sess->stats.bye_members = 1; sess->first_rtcp = TRUE; sess->sent_bye = FALSE; /* reschedule transmission */ sess->last_rtcp_send_time = current_time; interval = calculate_rtcp_interval (sess, FALSE, TRUE); sess->next_rtcp_check_time = current_time + interval; GST_DEBUG ("Schedule BYE for %" GST_TIME_FORMAT ", %" GST_TIME_FORMAT, GST_TIME_ARGS (interval), GST_TIME_ARGS (sess->next_rtcp_check_time)); RTP_SESSION_UNLOCK (sess); /* notify app of reconsideration */ if (sess->callbacks.reconsider) sess->callbacks.reconsider (sess, sess->reconsider_user_data); RTP_SESSION_LOCK (sess); done: return result; } /** * rtp_session_schedule_bye: * @sess: an #RTPSession * @reason: a reason or NULL * @current_time: the current system time * * Stop the current @sess and schedule a BYE message for the other members. * * Returns: a #GstFlowReturn. */ GstFlowReturn rtp_session_schedule_bye (RTPSession * sess, const gchar * reason, GstClockTime current_time) { GstFlowReturn result = GST_FLOW_OK; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); RTP_SESSION_LOCK (sess); result = rtp_session_schedule_bye_locked (sess, reason, current_time); RTP_SESSION_UNLOCK (sess); return result; } /** * rtp_session_next_timeout: * @sess: an #RTPSession * @current_time: the current system time * * Get the next time we should perform session maintenance tasks. * * Returns: a time when rtp_session_on_timeout() should be called with the * current system time. */ GstClockTime rtp_session_next_timeout (RTPSession * sess, GstClockTime current_time) { GstClockTime result; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); RTP_SESSION_LOCK (sess); result = sess->next_rtcp_check_time; GST_DEBUG ("current time: %" GST_TIME_FORMAT ", next :%" GST_TIME_FORMAT, GST_TIME_ARGS (current_time), GST_TIME_ARGS (result)); if (result < current_time) { GST_DEBUG ("take current time as base"); /* our previous check time expired, start counting from the current time * again. */ result = current_time; } if (sess->source->received_bye) { if (sess->sent_bye) { GST_DEBUG ("we sent BYE already"); result = GST_CLOCK_TIME_NONE; } else if (sess->stats.active_sources >= 50) { GST_DEBUG ("reconsider BYE, more than 50 sources"); /* reconsider BYE if members >= 50 */ result += calculate_rtcp_interval (sess, FALSE, TRUE); } } else { if (sess->first_rtcp) { GST_DEBUG ("first RTCP packet"); /* we are called for the first time */ result += calculate_rtcp_interval (sess, FALSE, TRUE); } else if (sess->next_rtcp_check_time < current_time) { GST_DEBUG ("old check time expired, getting new timeout"); /* get a new timeout when we need to */ result += calculate_rtcp_interval (sess, FALSE, FALSE); } } sess->next_rtcp_check_time = result; GST_DEBUG ("next timeout: %" GST_TIME_FORMAT, GST_TIME_ARGS (result)); RTP_SESSION_UNLOCK (sess); return result; } typedef struct { RTPSession *sess; GstBuffer *rtcp; GstClockTime current_time; guint64 ntpnstime; GstClockTime interval; GstRTCPPacket packet; gboolean is_bye; gboolean has_sdes; } ReportData; static void session_start_rtcp (RTPSession * sess, ReportData * data) { GstRTCPPacket *packet = &data->packet; RTPSource *own = sess->source; data->rtcp = gst_rtcp_buffer_new (sess->mtu); if (RTP_SOURCE_IS_SENDER (own)) { guint64 ntptime; guint32 rtptime; guint32 packet_count, octet_count; /* we are a sender, create SR */ GST_DEBUG ("create SR for SSRC %08x", own->ssrc); gst_rtcp_buffer_add_packet (data->rtcp, GST_RTCP_TYPE_SR, packet); /* get latest stats */ rtp_source_get_new_sr (own, data->ntpnstime, &ntptime, &rtptime, &packet_count, &octet_count); /* store stats */ rtp_source_process_sr (own, data->current_time, ntptime, rtptime, packet_count, octet_count); /* fill in sender report info */ gst_rtcp_packet_sr_set_sender_info (packet, own->ssrc, ntptime, rtptime, packet_count, octet_count); } else { /* we are only receiver, create RR */ GST_DEBUG ("create RR for SSRC %08x", own->ssrc); gst_rtcp_buffer_add_packet (data->rtcp, GST_RTCP_TYPE_RR, packet); gst_rtcp_packet_rr_set_ssrc (packet, own->ssrc); } } /* construct a Sender or Receiver Report */ static void session_report_blocks (const gchar * key, RTPSource * source, ReportData * data) { RTPSession *sess = data->sess; GstRTCPPacket *packet = &data->packet; /* create a new buffer if needed */ if (data->rtcp == NULL) { session_start_rtcp (sess, data); } if (gst_rtcp_packet_get_rb_count (packet) < GST_RTCP_MAX_RB_COUNT) { /* only report about other sender sources */ if (source != sess->source && RTP_SOURCE_IS_SENDER (source)) { guint8 fractionlost; gint32 packetslost; guint32 exthighestseq, jitter; guint32 lsr, dlsr; /* get new stats */ rtp_source_get_new_rb (source, data->current_time, &fractionlost, &packetslost, &exthighestseq, &jitter, &lsr, &dlsr); /* packet is not yet filled, add report block for this source. */ gst_rtcp_packet_add_rb (packet, source->ssrc, fractionlost, packetslost, exthighestseq, jitter, lsr, dlsr); } } } /* perform cleanup of sources that timed out */ static gboolean session_cleanup (const gchar * key, RTPSource * source, ReportData * data) { gboolean remove = FALSE; gboolean byetimeout = FALSE; gboolean sendertimeout = FALSE; gboolean is_sender, is_active; RTPSession *sess = data->sess; GstClockTime interval; is_sender = RTP_SOURCE_IS_SENDER (source); is_active = RTP_SOURCE_IS_ACTIVE (source); /* check for our own source, we don't want to delete our own source. */ if (!(source == sess->source)) { if (source->received_bye) { /* if we received a BYE from the source, remove the source after some * time. */ if (data->current_time > source->bye_time && data->current_time - source->bye_time > sess->stats.bye_timeout) { GST_DEBUG ("removing BYE source %08x", source->ssrc); remove = TRUE; byetimeout = TRUE; } } /* sources that were inactive for more than 5 times the deterministic reporting * interval get timed out. the min timeout is 5 seconds. */ if (data->current_time > source->last_activity) { interval = MAX (data->interval * 5, 5 * GST_SECOND); if (data->current_time - source->last_activity > interval) { GST_DEBUG ("removing timeout source %08x, last %" GST_TIME_FORMAT, source->ssrc, GST_TIME_ARGS (source->last_activity)); remove = TRUE; } } } /* senders that did not send for a long time become a receiver, this also * holds for our own source. */ if (is_sender) { if (data->current_time > source->last_rtp_activity) { interval = MAX (data->interval * 2, 5 * GST_SECOND); if (data->current_time - source->last_rtp_activity > interval) { GST_DEBUG ("sender source %08x timed out and became receiver, last %" GST_TIME_FORMAT, source->ssrc, GST_TIME_ARGS (source->last_rtp_activity)); source->is_sender = FALSE; sess->stats.sender_sources--; sendertimeout = TRUE; } } } if (remove) { sess->total_sources--; if (is_sender) sess->stats.sender_sources--; if (is_active) sess->stats.active_sources--; if (byetimeout) on_bye_timeout (sess, source); else on_timeout (sess, source); } else { if (sendertimeout) on_sender_timeout (sess, source); } return remove; } static void session_sdes (RTPSession * sess, ReportData * data) { GstRTCPPacket *packet = &data->packet; const GstStructure *sdes; gint i, n_fields; /* add SDES packet */ gst_rtcp_buffer_add_packet (data->rtcp, GST_RTCP_TYPE_SDES, packet); gst_rtcp_packet_sdes_add_item (packet, sess->source->ssrc); sdes = rtp_source_get_sdes_struct (sess->source); /* add all fields in the structure, the order is not important. */ n_fields = gst_structure_n_fields (sdes); for (i = 0; i < n_fields; ++i) { const gchar *field; const gchar *value; GstRTCPSDESType type; field = gst_structure_nth_field_name (sdes, i); if (field == NULL) continue; value = gst_structure_get_string (sdes, field); if (value == NULL) continue; type = gst_rtcp_sdes_name_to_type (field); if (type > GST_RTCP_SDES_END && type < GST_RTCP_SDES_PRIV) { gst_rtcp_packet_sdes_add_entry (packet, type, strlen (value), (const guint8 *) value); } else if (type == GST_RTCP_SDES_PRIV) { gsize prefix_len; gsize value_len; gsize data_len; guint8 data[256]; /* don't accept entries that are too big */ prefix_len = strlen (field); if (prefix_len > 255) continue; value_len = strlen (value); if (value_len > 255) continue; data_len = 1 + prefix_len + value_len; if (data_len > 255) continue; data[0] = prefix_len; memcpy (&data[1], field, prefix_len); memcpy (&data[1 + prefix_len], value, value_len); gst_rtcp_packet_sdes_add_entry (packet, type, data_len, data); } } data->has_sdes = TRUE; } /* schedule a BYE packet */ static void session_bye (RTPSession * sess, ReportData * data) { GstRTCPPacket *packet = &data->packet; /* open packet */ session_start_rtcp (sess, data); /* add SDES */ session_sdes (sess, data); /* add a BYE packet */ gst_rtcp_buffer_add_packet (data->rtcp, GST_RTCP_TYPE_BYE, packet); gst_rtcp_packet_bye_add_ssrc (packet, sess->source->ssrc); if (sess->bye_reason) gst_rtcp_packet_bye_set_reason (packet, sess->bye_reason); /* we have a BYE packet now */ data->is_bye = TRUE; } static gboolean is_rtcp_time (RTPSession * sess, GstClockTime current_time, ReportData * data) { GstClockTime new_send_time, elapsed; gboolean result; /* no need to check yet */ if (sess->next_rtcp_check_time > current_time) { GST_DEBUG ("no check time yet, next %" GST_TIME_FORMAT " > now %" GST_TIME_FORMAT, GST_TIME_ARGS (sess->next_rtcp_check_time), GST_TIME_ARGS (current_time)); return FALSE; } /* get elapsed time since we last reported */ elapsed = current_time - sess->last_rtcp_send_time; /* perform forward reconsideration */ new_send_time = rtp_stats_add_rtcp_jitter (&sess->stats, data->interval); GST_DEBUG ("forward reconsideration %" GST_TIME_FORMAT ", elapsed %" GST_TIME_FORMAT, GST_TIME_ARGS (new_send_time), GST_TIME_ARGS (elapsed)); new_send_time += sess->last_rtcp_send_time; /* check if reconsideration */ if (current_time < new_send_time) { GST_DEBUG ("reconsider RTCP for %" GST_TIME_FORMAT, GST_TIME_ARGS (new_send_time)); result = FALSE; /* store new check time */ sess->next_rtcp_check_time = new_send_time; } else { result = TRUE; new_send_time = calculate_rtcp_interval (sess, FALSE, FALSE); GST_DEBUG ("can send RTCP now, next interval %" GST_TIME_FORMAT, GST_TIME_ARGS (new_send_time)); sess->next_rtcp_check_time = current_time + new_send_time; } return result; } /** * rtp_session_on_timeout: * @sess: an #RTPSession * @current_time: the current system time * @ntpnstime: the current NTP time in nanoseconds * * Perform maintenance actions after the timeout obtained with * rtp_session_next_timeout() expired. * * This function will perform timeouts of receivers and senders, send a BYE * packet or generate RTCP packets with current session stats. * * This function can call the #RTPSessionSendRTCP callback, possibly multiple * times, for each packet that should be processed. * * Returns: a #GstFlowReturn. */ GstFlowReturn rtp_session_on_timeout (RTPSession * sess, GstClockTime current_time, guint64 ntpnstime) { GstFlowReturn result = GST_FLOW_OK; GList *item; ReportData data; RTPSource *own; gboolean notify = FALSE; g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR); GST_DEBUG ("reporting at %" GST_TIME_FORMAT ", NTP time %" GST_TIME_FORMAT, GST_TIME_ARGS (current_time), GST_TIME_ARGS (ntpnstime)); data.sess = sess; data.rtcp = NULL; data.current_time = current_time; data.ntpnstime = ntpnstime; data.is_bye = FALSE; data.has_sdes = FALSE; own = sess->source; RTP_SESSION_LOCK (sess); /* get a new interval, we need this for various cleanups etc */ data.interval = calculate_rtcp_interval (sess, TRUE, sess->first_rtcp); /* first perform cleanups */ g_hash_table_foreach_remove (sess->ssrcs[sess->mask_idx], (GHRFunc) session_cleanup, &data); /* see if we need to generate SR or RR packets */ if (is_rtcp_time (sess, current_time, &data)) { if (own->received_bye) { /* generate BYE instead */ GST_DEBUG ("generating BYE message"); session_bye (sess, &data); sess->sent_bye = TRUE; } else { /* loop over all known sources and do something */ g_hash_table_foreach (sess->ssrcs[sess->mask_idx], (GHFunc) session_report_blocks, &data); } } if (data.rtcp) { guint size; /* we keep track of the last report time in order to timeout inactive * receivers or senders */ sess->last_rtcp_send_time = data.current_time; sess->first_rtcp = FALSE; /* add SDES for this source when not already added */ if (!data.has_sdes) session_sdes (sess, &data); /* update average RTCP size before sending */ size = GST_BUFFER_SIZE (data.rtcp) + sess->header_len; UPDATE_AVG (sess->stats.avg_rtcp_packet_size, size); } /* check for outdated collisions */ GST_DEBUG ("checking collision list"); item = g_list_first (sess->conflicting_addresses); while (item) { RTPConflictingAddress *known_conflict = item->data; GList *next_item = g_list_next (item); if (known_conflict->time < current_time - (data.interval * RTCP_INTERVAL_COLLISION_TIMEOUT)) { sess->conflicting_addresses = g_list_delete_link (sess->conflicting_addresses, item); GST_DEBUG ("collision %p timed out", known_conflict); g_free (known_conflict); } item = next_item; } if (sess->change_ssrc) { GST_DEBUG ("need to change our SSRC (%08x)", own->ssrc); g_hash_table_steal (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (own->ssrc)); own->ssrc = rtp_session_create_new_ssrc (sess); rtp_source_reset (own); g_hash_table_insert (sess->ssrcs[sess->mask_idx], GINT_TO_POINTER (own->ssrc), own); g_free (sess->bye_reason); sess->bye_reason = NULL; sess->sent_bye = FALSE; sess->change_ssrc = FALSE; notify = TRUE; GST_DEBUG ("changed our SSRC to %08x", own->ssrc); } RTP_SESSION_UNLOCK (sess); if (notify) g_object_notify (G_OBJECT (sess), "internal-ssrc"); /* push out the RTCP packet */ if (data.rtcp) { /* close the RTCP packet */ gst_rtcp_buffer_end (data.rtcp); GST_DEBUG ("sending packet"); if (sess->callbacks.send_rtcp) result = sess->callbacks.send_rtcp (sess, own, data.rtcp, sess->sent_bye, sess->send_rtcp_user_data); else { GST_DEBUG ("freeing packet"); gst_buffer_unref (data.rtcp); } } return result; }