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owr_transport_agent.c
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owr_transport_agent.c
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/*
* Copyright (c) 2014-2015, Ericsson AB. All rights reserved.
* Copyright (c) 2014, Centricular Ltd
* Author: Sebastian Dröge <sebastian@centricular.com>
* Author: Arun Raghavan <arun@centricular.com>
* Copyright (c) 2015, Collabora Ltd.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
/*/
\*\ OwrTransportAgent
/*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "owr_transport_agent.h"
#include "owr_arrival_time_meta.h"
#include "owr_audio_payload.h"
#include "owr_candidate_private.h"
#include "owr_data_channel.h"
#include "owr_data_channel_private.h"
#include "owr_data_channel_protocol.h"
#include "owr_data_session.h"
#include "owr_data_session_private.h"
#include "owr_media_session.h"
#include "owr_media_session_private.h"
#include "owr_media_source.h"
#include "owr_media_source_private.h"
#include "owr_message_origin_private.h"
#include "owr_payload_private.h"
#include "owr_private.h"
#include "owr_remote_media_source.h"
#include "owr_remote_media_source_private.h"
#include "owr_session.h"
#include "owr_session_private.h"
#include "owr_types.h"
#include "owr_utils.h"
#include "owr_video_payload.h"
#include <agent.h>
#include <interfaces.h>
#include <gst/app/gstappsink.h>
#include <gst/app/gstappsrc.h>
#include <gst/gst.h>
#include <gst/rtp/gstrtcpbuffer.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/rtp/gstrtpdefs.h>
#include <gst/sctp/sctpreceivemeta.h>
#include <gst/sctp/sctpsendmeta.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
GST_DEBUG_CATEGORY_EXTERN(_owrtransportagent_debug);
GST_DEBUG_CATEGORY_EXTERN(_owrsession_debug);
#define GST_CAT_DEFAULT _owrtransportagent_debug
#define DEFAULT_ICE_CONTROLLING_MODE TRUE
#define GST_RTCP_RTPFB_TYPE_SCREAM 18
enum {
PROP_0,
PROP_ICE_CONTROLLING_MODE,
N_PROPERTIES
};
static GParamSpec *obj_properties[N_PROPERTIES] = {NULL, };
static guint next_transport_agent_id = 1;
#define OWR_TRANSPORT_AGENT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), OWR_TYPE_TRANSPORT_AGENT, OwrTransportAgentPrivate))
static void owr_message_origin_interface_init(OwrMessageOriginInterface *interface);
G_DEFINE_TYPE_WITH_CODE(OwrTransportAgent, owr_transport_agent, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE(OWR_TYPE_MESSAGE_ORIGIN, owr_message_origin_interface_init))
typedef struct {
OwrDataChannelState state;
GstElement *data_sink, *data_src;
guint session_id;
gboolean ordered;
gint max_packet_life_time;
gint max_packet_retransmits;
gchar *protocol;
gboolean negotiated;
guint16 id;
gchar *label;
GRWLock rw_mutex;
guint ctrl_bytes_sent;
} DataChannel;
typedef struct {
GstElement *dtls_srtp_bin_rtp;
GstElement *dtls_srtp_bin_rtcp;
GstElement *send_output_bin;
gboolean linked_rtcp;
} SendBinInfo;
typedef struct {
GstElement *nice_src_rtp, *dtls_dec_rtp;
gulong nice_src_block_rtp;
GstElement *nice_src_rtcp, *dtls_dec_rtcp;
gulong nice_src_block_rtcp;
GstElement *nice_sink_rtp, *dtls_enc_rtp;
GstElement *nice_sink_rtcp, *dtls_enc_rtcp;
} PendingSessionInfo;
struct _OwrTransportAgentPrivate {
NiceAgent *nice_agent;
gboolean ice_controlling_mode;
GMutex sessions_lock;
GHashTable *sessions;
GHashTable *pending_sessions;
guint agent_id;
gchar *transport_bin_name;
GstElement *pipeline, *transport_bin;
GstElement *rtpbin;
/* session_id -> struct SendBinInfo */
GHashTable *send_bins;
gboolean local_address_added;
GHashTable *streams;
GList *rtcp_list;
GMutex rtcp_lock;
guint local_min_port;
guint local_max_port;
guint deferred_helper_server_adds;
GList *helper_server_infos;
GHashTable *data_channels;
GRWLock data_channels_rw_mutex;
gboolean data_session_added, data_session_established;
OwrMessageOriginBusSet *message_origin_bus_set;
};
typedef struct {
OwrTransportAgent *transport_agent;
guint session_id;
} AgentAndSessionIdPair;
typedef struct {
OwrTransportAgent *transport_agent;
guint session_id;
gint rtx_pt;
gboolean adapt;
gushort highest_seq;
guint16 ack_vec;
guint8 n_loss;
guint8 n_ecn;
guint receive_wallclock;
guint32 last_feedback_wallclock;
} ScreamRx;
#define GEN_HASH_KEY(seq, ssrc) (seq ^ ssrc)
static void owr_transport_agent_set_property(GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec);
static void owr_transport_agent_get_property(GObject *object, guint property_id,
GValue *value, GParamSpec *pspec);
static void add_helper_server_info(GResolver *resolver, GAsyncResult *result, GHashTable *info);
static void update_helper_servers(OwrTransportAgent *transport_agent, guint stream_id);
static gboolean add_session(GHashTable *args);
static guint get_stream_id(OwrTransportAgent *transport_agent, OwrSession *session);
static OwrSession * get_session(OwrTransportAgent *transport_agent, guint stream_id);
static void prepare_transport_bin_send_elements(OwrTransportAgent *transport_agent, guint stream_id, gboolean rtcp_mux, PendingSessionInfo *pending_session_info);
static void prepare_transport_bin_receive_elements(OwrTransportAgent *transport_agent, guint stream_id, gboolean rtcp_mux, PendingSessionInfo *pending_session_info);
static void prepare_transport_bin_data_receive_elements(OwrTransportAgent *transport_agent,
guint stream_id);
static void prepare_transport_bin_data_send_elements(OwrTransportAgent *transport_agent,
guint stream_id);
static void set_send_ssrc_and_cname(OwrTransportAgent *agent, OwrMediaSession *media_session);
static void on_new_candidate(NiceAgent *nice_agent, NiceCandidate *nice_candidate, OwrTransportAgent *transport_agent);
static void on_candidate_gathering_done(NiceAgent *nice_agent, guint stream_id, OwrTransportAgent *transport_agent);
static void on_component_state_changed(NiceAgent *nice_agent, guint stream_id, guint component_id, OwrIceState state, OwrTransportAgent *transport_agent);
static void handle_new_send_payload(OwrTransportAgent *transport_agent, OwrMediaSession *media_session, OwrPayload * payload);
static void on_new_remote_candidate(OwrTransportAgent *transport_agent, gboolean forced, OwrSession *session);
static void on_local_candidate_change(OwrTransportAgent *transport_agent, OwrCandidate *candidate, OwrSession *session);
static void on_transport_bin_pad_added(GstElement *transport_bin, GstPad *new_pad, OwrTransportAgent *transport_agent);
static void on_rtpbin_pad_added(GstElement *rtpbin, GstPad *new_pad, OwrTransportAgent *agent);
static void setup_video_receive_elements(GstPad *new_pad, guint32 session_id, OwrPayload *payload, OwrTransportAgent *transport_agent);
static void setup_audio_receive_elements(GstPad *new_pad, guint32 session_id, OwrPayload *payload, OwrTransportAgent *transport_agent);
static GstCaps * on_rtpbin_request_pt_map(GstElement *rtpbin, guint session_id, guint pt, OwrTransportAgent *agent);
static GstElement * on_rtpbin_request_aux_sender(GstElement *rtpbin, guint session_id, OwrTransportAgent *transport_agent);
static GstElement * on_rtpbin_request_aux_receiver(GstElement *rtpbin, guint session_id, OwrTransportAgent *transport_agent);
static void on_dtls_enc_key_set(GstElement *dtls_srtp_enc, AgentAndSessionIdPair *data);
static void on_new_selected_pair(NiceAgent *nice_agent,
guint stream_id, guint component_id,
NiceCandidate *lcandidate, NiceCandidate *rcandidate,
OwrTransportAgent *transport_agent);
static gboolean on_sending_rtcp(GObject *session, GstBuffer *buffer, gboolean early, OwrTransportAgent *agent);
static void on_receiving_rtcp(GObject *session, GstBuffer *buffer, OwrTransportAgent *agent);
static void on_feedback_rtcp(GObject *session, guint type, guint fbtype, guint sender_ssrc, guint media_ssrc, GstBuffer *fci, OwrTransportAgent *transport_agent);
static GstPadProbeReturn probe_save_ts(GstPad *srcpad, GstPadProbeInfo *info, void *user_data);
static GstPadProbeReturn probe_rtp_info(GstPad *srcpad, GstPadProbeInfo *info, ScreamRx *scream_rx);
static void on_ssrc_active(GstElement *rtpbin, guint session_id, guint ssrc, OwrTransportAgent *transport_agent);
static void on_new_jitterbuffer(GstElement *rtpbin, GstElement *jitterbuffer, guint session_id, guint ssrc, OwrTransportAgent *transport_agent);
static void prepare_rtcp_stats(OwrMediaSession *media_session, GObject *rtp_source);
static void data_channel_free(DataChannel *data_channel);
static gboolean create_datachannel(OwrTransportAgent *transport_agent, guint32 session_id,
OwrDataChannel *data_channel);
static void sctpdec_pad_added(GstElement *sctpdec, GstPad *sctpdec_srcpad,
OwrTransportAgent *transport_agent);
static void sctpdec_pad_removed(GstElement *sctpdec, GstPad *sctpdec_srcpad,
OwrTransportAgent *transport_agent);
static void on_sctp_association_established(GstElement *sctpenc, gboolean established,
OwrTransportAgent *transport_agent);
static GstFlowReturn new_data_callback(GstAppSink *appsink, OwrTransportAgent *transport_agent);
static gboolean create_datachannel_appsrc(OwrTransportAgent *transport_agent,
OwrDataChannel *data_channel);
static gboolean is_valid_sctp_stream_id(OwrTransportAgent *transport_agent, guint32 session_id,
guint16 sctp_stream_id, gboolean remotly_initiated);
static guint8 * create_datachannel_open_request(OwrDataChannelChannelType channel_type,
guint32 reliability_param, guint16 priority, const gchar *label, guint16 label_len,
const gchar *protocol, guint16 protocol_len, guint32 *buf_size);
static guint8 * create_datachannel_ack(guint32 *buf_size);
static void handle_data_channel_control_message(OwrTransportAgent *transport_agent, guint8 *data,
guint32 size, guint16 sctp_stream_id);
static void handle_data_channel_open_request(OwrTransportAgent *transport_agent, guint8 *data,
guint32 size, guint16 sctp_stream_id);
static gboolean emit_data_channel_requested(GHashTable *args);
static void handle_data_channel_ack(OwrTransportAgent *transport_agent, guint8 *data, guint32 size,
guint16 sctp_stream_id);
static void handle_data_channel_message(OwrTransportAgent *transport_agent, guint8 *data,
guint32 size, guint16 sctp_stream_id, gboolean is_binary);
static gboolean emit_incoming_data(GHashTable *args);
static guint64 on_datachannel_request_bytes_sent(OwrTransportAgent *transport_agent,
OwrDataChannel *data_channel);
static void on_datachannel_close(OwrTransportAgent *transport_agent, OwrDataChannel *data_channel);
static gboolean is_same_session(gpointer stream_id_p, OwrSession *session1, OwrSession *session2);
static void on_new_datachannel(OwrTransportAgent *transport_agent, OwrDataChannel *data_channel,
OwrDataSession *data_session);
static void complete_data_channel_and_ack(OwrTransportAgent *transport_agent,
OwrDataChannel *data_channel);
static void on_datachannel_send(OwrTransportAgent *transport_agent, guint8 *data, guint len,
gboolean is_binary, OwrDataChannel *data_channel);
static void maybe_close_data_channel(OwrTransportAgent *transport_agent, DataChannel *data_channel_info);
static gboolean on_payload_adaptation_request(GstElement *screamqueue, guint pt,
OwrMediaSession *media_session);
static void owr_transport_agent_finalize(GObject *object)
{
OwrTransportAgent *transport_agent = NULL;
OwrTransportAgentPrivate *priv = NULL;
OwrSession *session = NULL;
GList *sessions_list = NULL, *item = NULL;
g_return_if_fail(_owr_is_initialized());
transport_agent = OWR_TRANSPORT_AGENT(object);
priv = transport_agent->priv;
gst_element_set_state(priv->pipeline, GST_STATE_NULL);
gst_object_unref(priv->pipeline);
sessions_list = g_hash_table_get_values(priv->sessions);
for (item = sessions_list; item; item = item->next) {
session = item->data;
if (OWR_IS_MEDIA_SESSION(session))
_owr_media_session_clear_closures(OWR_MEDIA_SESSION(session));
else if (OWR_IS_DATA_SESSION(session))
_owr_data_session_clear_closures(OWR_DATA_SESSION(session));
}
g_list_free(sessions_list);
g_hash_table_destroy(priv->sessions);
g_hash_table_destroy(priv->pending_sessions);
g_mutex_clear(&priv->sessions_lock);
g_hash_table_destroy(priv->data_channels);
g_rw_lock_clear(&priv->data_channels_rw_mutex);
g_object_unref(priv->nice_agent);
g_free(priv->transport_bin_name);
for (item = priv->helper_server_infos; item; item = item->next) {
g_free(g_hash_table_lookup(item->data, "address"));
g_free(g_hash_table_lookup(item->data, "username"));
g_free(g_hash_table_lookup(item->data, "password"));
g_hash_table_destroy(item->data);
}
g_list_free(priv->helper_server_infos);
g_hash_table_destroy(priv->send_bins);
owr_message_origin_bus_set_free(priv->message_origin_bus_set);
priv->message_origin_bus_set = NULL;
g_list_free_full(priv->rtcp_list, (GDestroyNotify)g_hash_table_unref);
g_mutex_clear(&priv->rtcp_lock);
G_OBJECT_CLASS(owr_transport_agent_parent_class)->finalize(object);
}
static void owr_transport_agent_class_init(OwrTransportAgentClass *klass)
{
GObjectClass *gobject_class;
g_type_class_add_private(klass, sizeof(OwrTransportAgentPrivate));
gobject_class = G_OBJECT_CLASS(klass);
obj_properties[PROP_ICE_CONTROLLING_MODE] = g_param_spec_boolean("ice-controlling-mode",
"Ice controlling mode", "Whether the ice agent is in controlling mode",
DEFAULT_ICE_CONTROLLING_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
gobject_class->set_property = owr_transport_agent_set_property;
gobject_class->get_property = owr_transport_agent_get_property;
gobject_class->finalize = owr_transport_agent_finalize;
g_object_class_install_properties(gobject_class, N_PROPERTIES, obj_properties);
}
static gpointer owr_transport_agent_get_bus_set(OwrMessageOrigin *origin)
{
return OWR_TRANSPORT_AGENT(origin)->priv->message_origin_bus_set;
}
static void owr_message_origin_interface_init(OwrMessageOriginInterface *interface)
{
interface->get_bus_set = owr_transport_agent_get_bus_set;
}
/* FIXME: Copy from owr/orw.c without any error handling whatsoever */
static gboolean bus_call(GstBus *bus, GstMessage *msg, gpointer user_data)
{
gboolean ret, is_warning = FALSE;
GstStateChangeReturn change_status;
gchar *message_type, *debug;
GError *error;
OwrTransportAgent *transport_agent = user_data;
GstElement *pipeline = transport_agent->priv->pipeline;
g_return_val_if_fail(GST_IS_BUS(bus), TRUE);
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_LATENCY:
ret = gst_bin_recalculate_latency(GST_BIN(pipeline));
g_warn_if_fail(ret);
break;
case GST_MESSAGE_CLOCK_LOST:
change_status = gst_element_set_state(pipeline, GST_STATE_PAUSED);
g_warn_if_fail(change_status != GST_STATE_CHANGE_FAILURE);
change_status = gst_element_set_state(pipeline, GST_STATE_PLAYING);
g_warn_if_fail(change_status != GST_STATE_CHANGE_FAILURE);
break;
case GST_MESSAGE_EOS:
g_print("End of stream\n");
break;
case GST_MESSAGE_WARNING:
is_warning = TRUE;
/* fallthru */
case GST_MESSAGE_ERROR:
if (is_warning) {
message_type = "Warning";
gst_message_parse_warning(msg, &error, &debug);
} else {
message_type = "Error";
gst_message_parse_error(msg, &error, &debug);
}
g_printerr("==== %s message start ====\n", message_type);
g_printerr("%s in element %s.\n", message_type, GST_OBJECT_NAME(msg->src));
g_printerr("%s: %s\n", message_type, error->message);
g_printerr("Debugging info: %s\n", (debug) ? debug : "none");
g_printerr("==== %s message stop ====\n", message_type);
/*GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(pipeline), GST_DEBUG_GRAPH_SHOW_ALL, "pipeline.dot");*/
if (!is_warning) {
OWR_POST_ERROR(transport_agent, PROCESSING_ERROR, NULL);
}
g_error_free(error);
g_free(debug);
break;
default:
break;
}
return TRUE;
}
static void owr_transport_agent_init(OwrTransportAgent *transport_agent)
{
OwrTransportAgentPrivate *priv;
GstBus *bus;
GSource *bus_source;
gchar *pipeline_name;
transport_agent->priv = priv = OWR_TRANSPORT_AGENT_GET_PRIVATE(transport_agent);
priv->ice_controlling_mode = DEFAULT_ICE_CONTROLLING_MODE;
priv->agent_id = next_transport_agent_id++;
priv->nice_agent = NULL;
priv->sessions = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, g_object_unref);
priv->pending_sessions = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, g_free);
g_mutex_init(&priv->sessions_lock);
priv->rtcp_list = NULL;
g_mutex_init(&transport_agent->priv->rtcp_lock);
g_return_if_fail(_owr_is_initialized());
priv->nice_agent = nice_agent_new(_owr_get_main_context(), NICE_COMPATIBILITY_RFC5245);
g_object_bind_property(transport_agent, "ice-controlling-mode", priv->nice_agent,
"controlling-mode", G_BINDING_SYNC_CREATE);
g_signal_connect(G_OBJECT(priv->nice_agent), "new-candidate-full",
G_CALLBACK(on_new_candidate), transport_agent);
g_signal_connect(G_OBJECT(priv->nice_agent), "candidate-gathering-done",
G_CALLBACK(on_candidate_gathering_done), transport_agent);
g_signal_connect(G_OBJECT(priv->nice_agent), "component-state-changed",
G_CALLBACK(on_component_state_changed), transport_agent);
g_signal_connect(G_OBJECT(priv->nice_agent), "new-selected-pair-full",
G_CALLBACK(on_new_selected_pair), transport_agent);
pipeline_name = g_strdup_printf("transport-agent-%u", priv->agent_id);
priv->pipeline = gst_pipeline_new(pipeline_name);
gst_pipeline_use_clock(GST_PIPELINE(priv->pipeline), gst_system_clock_obtain());
gst_element_set_base_time(priv->pipeline, _owr_get_base_time());
gst_element_set_start_time(priv->pipeline, GST_CLOCK_TIME_NONE);
g_free(pipeline_name);
#ifdef OWR_DEBUG
g_signal_connect(priv->pipeline, "deep-notify", G_CALLBACK(_owr_deep_notify), NULL);
#endif
bus = gst_pipeline_get_bus(GST_PIPELINE(priv->pipeline));
bus_source = gst_bus_create_watch(bus);
g_source_set_callback(bus_source, (GSourceFunc) bus_call, transport_agent, NULL);
g_source_attach(bus_source, _owr_get_main_context());
g_source_unref(bus_source);
priv->transport_bin_name = g_strdup_printf("transport_bin_%u", priv->agent_id);
priv->transport_bin = gst_bin_new(priv->transport_bin_name);
priv->rtpbin = gst_element_factory_make("rtpbin", "rtpbin");
g_object_set(priv->rtpbin, "do-lost", TRUE, NULL);
/* NOTE: We hard-code the savpf here as it is required for WebRTC */
gst_util_set_object_arg(G_OBJECT(priv->rtpbin), "rtp-profile", "savpf");
g_signal_connect(priv->rtpbin, "pad-added", G_CALLBACK(on_rtpbin_pad_added), transport_agent);
g_signal_connect(priv->rtpbin, "request-pt-map", G_CALLBACK(on_rtpbin_request_pt_map), transport_agent);
g_signal_connect(priv->rtpbin, "request-aux-sender", G_CALLBACK(on_rtpbin_request_aux_sender), transport_agent);
g_signal_connect(priv->rtpbin, "request-aux-receiver", G_CALLBACK(on_rtpbin_request_aux_receiver), transport_agent);
g_signal_connect(priv->rtpbin, "on-ssrc-active", G_CALLBACK(on_ssrc_active), transport_agent);
g_signal_connect(priv->rtpbin, "new-jitterbuffer", G_CALLBACK(on_new_jitterbuffer), transport_agent);
g_signal_connect(priv->transport_bin, "pad-added", G_CALLBACK(on_transport_bin_pad_added), transport_agent);
gst_bin_add(GST_BIN(priv->transport_bin), priv->rtpbin);
gst_bin_add(GST_BIN(priv->pipeline), priv->transport_bin);
priv->local_address_added = FALSE;
priv->local_min_port = 0;
priv->local_max_port = 0;
priv->deferred_helper_server_adds = 0;
priv->helper_server_infos = NULL;
priv->data_channels = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, (GDestroyNotify)data_channel_free);
g_rw_lock_init(&priv->data_channels_rw_mutex);
priv->data_session_added = FALSE;
priv->data_session_established = FALSE;
priv->send_bins = g_hash_table_new_full(NULL, NULL, NULL, g_free);
priv->message_origin_bus_set = owr_message_origin_bus_set_new();
}
static void owr_transport_agent_set_property(GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec)
{
OwrTransportAgent *transport_agent;
OwrTransportAgentPrivate *priv;
g_return_if_fail(object);
transport_agent = OWR_TRANSPORT_AGENT(object);
priv = transport_agent->priv;
switch (property_id) {
case PROP_ICE_CONTROLLING_MODE:
priv->ice_controlling_mode = g_value_get_boolean(value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
break;
}
}
static void owr_transport_agent_get_property(GObject *object, guint property_id,
GValue *value, GParamSpec *pspec)
{
OwrTransportAgent *transport_agent;
OwrTransportAgentPrivate *priv;
g_return_if_fail(object);
transport_agent = OWR_TRANSPORT_AGENT(object);
priv = transport_agent->priv;
switch (property_id) {
case PROP_ICE_CONTROLLING_MODE:
g_value_set_boolean(value, priv->ice_controlling_mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
break;
}
}
OwrTransportAgent * owr_transport_agent_new(gboolean ice_controlling_mode)
{
return g_object_new(OWR_TYPE_TRANSPORT_AGENT, "ice-controlling_mode", ice_controlling_mode,
NULL);
}
/**
* owr_transport_agent_add_helper_server:
* @transport_agent: The #OwrTransportAgent that should use a helper server
* @type: The type of helper server to add
* @address: The IP address or hostname of the helper server
* @port: The port on the helper server
* @username: (allow-none): The helper server username (when applicable)
* @password: (allow-none): The helper server password (when applicable)
*
*/
void owr_transport_agent_add_helper_server(OwrTransportAgent *transport_agent,
OwrHelperServerType type, const gchar *address, guint port,
const gchar *username, const gchar *password)
{
GHashTable *helper_server_info;
GResolver *resolver;
g_return_if_fail(OWR_IS_TRANSPORT_AGENT(transport_agent));
transport_agent->priv->deferred_helper_server_adds++;
helper_server_info = _owr_create_schedule_table(OWR_MESSAGE_ORIGIN(transport_agent));
g_hash_table_insert(helper_server_info, "transport_agent", transport_agent);
g_hash_table_insert(helper_server_info, "type", GUINT_TO_POINTER(type));
g_hash_table_insert(helper_server_info, "port", GUINT_TO_POINTER(port));
if (username)
g_hash_table_insert(helper_server_info, "username", g_strdup(username));
if (password)
g_hash_table_insert(helper_server_info, "password", g_strdup(password));
g_object_ref(transport_agent);
resolver = g_resolver_get_default();
g_main_context_push_thread_default(_owr_get_main_context());
g_resolver_lookup_by_name_async(resolver, address, NULL,
(GAsyncReadyCallback)add_helper_server_info, helper_server_info);
g_main_context_pop_thread_default(_owr_get_main_context());
g_object_unref(resolver);
}
void owr_transport_agent_add_local_address(OwrTransportAgent *transport_agent, const gchar *local_address)
{
NiceAddress addr;
g_return_if_fail(OWR_IS_TRANSPORT_AGENT(transport_agent));
g_return_if_fail(local_address);
if (!nice_address_set_from_string(&addr, local_address))
g_warning("Supplied local address is not valid.");
else if (!nice_agent_add_local_address(transport_agent->priv->nice_agent, &addr))
g_warning("Failed to add local address.");
else
transport_agent->priv->local_address_added = TRUE;
}
void owr_transport_agent_set_local_port_range(OwrTransportAgent *transport_agent, guint min_port, guint max_port)
{
g_return_if_fail(OWR_IS_TRANSPORT_AGENT(transport_agent));
g_return_if_fail(max_port < 65536);
g_return_if_fail(min_port <= max_port);
transport_agent->priv->local_min_port = min_port;
transport_agent->priv->local_max_port = max_port;
}
/**
* owr_transport_agent_add_session:
* @agent:
* @session: (transfer full):
*/
void owr_transport_agent_add_session(OwrTransportAgent *agent, OwrSession *session)
{
GHashTable *args;
g_return_if_fail(agent);
g_return_if_fail(OWR_IS_MEDIA_SESSION(session) || OWR_IS_DATA_SESSION(session));
args = _owr_create_schedule_table(OWR_MESSAGE_ORIGIN(agent));
g_hash_table_insert(args, "transport_agent", agent);
g_hash_table_insert(args, "session", session);
g_object_ref(agent);
_owr_schedule_with_hash_table((GSourceFunc)add_session, args);
}
/* Internal functions */
static void add_helper_server_info(GResolver *resolver, GAsyncResult *result, GHashTable *info)
{
OwrTransportAgent *transport_agent;
OwrTransportAgentPrivate *priv;
GList *stream_ids, *item, *address_list;
GHashTable *stats_table;
OwrMessageOrigin *message_origin;
GValue *value;
guint stream_id;
GError *error = NULL;
transport_agent = OWR_TRANSPORT_AGENT(g_hash_table_lookup(info, "transport_agent"));
g_return_if_fail(OWR_IS_TRANSPORT_AGENT(transport_agent));
g_hash_table_remove(info, "transport_agent");
stats_table = g_hash_table_lookup(info, "__data");
g_warn_if_fail(stats_table);
g_hash_table_remove(info, "__data");
message_origin = OWR_MESSAGE_ORIGIN(g_hash_table_lookup(info, "__origin"));
g_warn_if_fail(message_origin);
g_hash_table_remove(info, "__origin");
if (stats_table && message_origin) {
value = _owr_value_table_add(stats_table, "call_time", G_TYPE_INT64);
g_value_set_int64(value, g_get_monotonic_time());
} else if (message_origin) {
g_object_unref(message_origin);
}
priv = transport_agent->priv;
priv->deferred_helper_server_adds--;
address_list = g_resolver_lookup_by_name_finish(resolver, result, &error);
if (!address_list) {
g_printerr("Failed to resolve helper server address: %s\n", error->message);
g_error_free(error);
g_free(g_hash_table_lookup(info, "username"));
g_free(g_hash_table_lookup(info, "password"));
g_hash_table_unref(info);
info = NULL;
} else {
g_hash_table_insert(info, "address", g_inet_address_to_string(address_list->data));
g_resolver_free_addresses(address_list);
priv->helper_server_infos = g_list_append(priv->helper_server_infos, info);
}
g_mutex_lock(&priv->sessions_lock);
stream_ids = g_hash_table_get_keys(priv->sessions);
g_mutex_unlock(&priv->sessions_lock);
for (item = stream_ids; item; item = item->next) {
stream_id = GPOINTER_TO_UINT(item->data);
if (info)
update_helper_servers(transport_agent, stream_id);
if (!priv->deferred_helper_server_adds)
nice_agent_gather_candidates(priv->nice_agent, stream_id);
}
g_list_free(stream_ids);
g_object_unref(transport_agent);
if (stats_table && message_origin) {
value = _owr_value_table_add(stats_table, "end_time", G_TYPE_INT64);
g_value_set_int64(value, g_get_monotonic_time());
OWR_POST_STATS(message_origin, SCHEDULE, stats_table);
g_object_unref(message_origin);
}
}
static void update_helper_servers(OwrTransportAgent *transport_agent, guint stream_id)
{
OwrTransportAgentPrivate *priv;
GHashTable *helper_server_info;
GList *item;
OwrHelperServerType type;
gchar *address, *username, *password;
guint port;
g_return_if_fail(OWR_IS_TRANSPORT_AGENT(transport_agent));
priv = transport_agent->priv;
nice_agent_forget_relays(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTP);
nice_agent_forget_relays(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTCP);
for (item = priv->helper_server_infos; item; item = item->next) {
helper_server_info = item->data;
type = GPOINTER_TO_UINT(g_hash_table_lookup(helper_server_info, "type"));
address = g_hash_table_lookup(helper_server_info, "address");
port = GPOINTER_TO_UINT(g_hash_table_lookup(helper_server_info, "port"));
username = g_hash_table_lookup(helper_server_info, "username");
password = g_hash_table_lookup(helper_server_info, "password");
switch (type) {
case OWR_HELPER_SERVER_TYPE_STUN:
g_object_set(priv->nice_agent, "stun-server", address, NULL);
g_object_set(priv->nice_agent, "stun-server-port", port, NULL);
break;
case OWR_HELPER_SERVER_TYPE_TURN_UDP:
nice_agent_set_relay_info(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTP,
address, port, username, password, NICE_RELAY_TYPE_TURN_UDP);
nice_agent_set_relay_info(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTCP,
address, port, username, password, NICE_RELAY_TYPE_TURN_UDP);
break;
case OWR_HELPER_SERVER_TYPE_TURN_TCP:
nice_agent_set_relay_info(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTP,
address, port, username, password, NICE_RELAY_TYPE_TURN_TCP);
nice_agent_set_relay_info(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTCP,
address, port, username, password, NICE_RELAY_TYPE_TURN_TCP);
break;
case OWR_HELPER_SERVER_TYPE_TURN_TLS:
nice_agent_set_relay_info(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTP,
address, port, username, password, NICE_RELAY_TYPE_TURN_TLS);
nice_agent_set_relay_info(priv->nice_agent, stream_id, NICE_COMPONENT_TYPE_RTCP,
address, port, username, password, NICE_RELAY_TYPE_TURN_TLS);
break;
}
}
}
static gboolean link_source_to_transport_bin(GstPad *srcpad, GstElement *pipeline, GstElement *transport_bin,
OwrMediaType media_type, OwrCodecType codec_type, guint stream_id)
{
GstPad *sinkpad;
gchar name[OWR_OBJECT_NAME_LENGTH_MAX] = { 0, };
gboolean ret = FALSE;
if (media_type == OWR_MEDIA_TYPE_UNKNOWN)
return FALSE;
if (media_type == OWR_MEDIA_TYPE_VIDEO)
g_snprintf(name, OWR_OBJECT_NAME_LENGTH_MAX, "video_sink_%u_%u", codec_type, stream_id);
else if (media_type == OWR_MEDIA_TYPE_AUDIO)
g_snprintf(name, OWR_OBJECT_NAME_LENGTH_MAX, "audio_raw_sink_%u", stream_id);
sinkpad = gst_element_get_static_pad(transport_bin, name);
ret = gst_pad_link(srcpad, sinkpad) == GST_PAD_LINK_OK;
gst_object_unref(sinkpad);
if (ret) {
gst_element_post_message(pipeline,
gst_message_new_latency(GST_OBJECT(pipeline)));
}
return ret;
}
static void handle_new_send_source(OwrTransportAgent *transport_agent,
OwrMediaSession *media_session, OwrMediaSource * send_source, OwrPayload * send_payload)
{
GstElement *transport_bin, *src;
GstCaps *caps;
OwrCodecType codec_type = OWR_CODEC_TYPE_NONE;
OwrMediaType media_type = OWR_MEDIA_TYPE_UNKNOWN;
guint stream_id = 0;
GstPad *srcpad;
g_return_if_fail(transport_agent);
g_return_if_fail(media_session);
g_assert(send_source);
g_assert(send_payload);
/* check that the source type matches the payload type */
g_object_get(send_source, "media-type", &media_type, NULL);
if (!((OWR_IS_AUDIO_PAYLOAD(send_payload) && media_type == OWR_MEDIA_TYPE_AUDIO)
|| (OWR_IS_VIDEO_PAYLOAD(send_payload) && media_type == OWR_MEDIA_TYPE_VIDEO))) {
GST_ERROR("Cannot send %s as %s", media_type == OWR_MEDIA_TYPE_AUDIO ? "audio" : "video",
media_type == OWR_MEDIA_TYPE_AUDIO ? "video" : "audio");
return;
}
/* FIXME - communicate what codec types are supported by the source
* and if one is reusable, use it, else raw?
g_object_get(send_payload, "codec-type", &codec_type, NULL);
*/
caps = _owr_payload_create_raw_caps(send_payload);
src = _owr_media_source_request_source(send_source, caps);
g_assert(src);
gst_caps_unref(caps);
srcpad = gst_element_get_static_pad(src, "src");
g_assert(srcpad);
transport_bin = transport_agent->priv->transport_bin;
stream_id = get_stream_id(transport_agent, OWR_SESSION(media_session));
g_return_if_fail(stream_id);
gst_bin_add(GST_BIN(transport_agent->priv->pipeline), src);
if (!link_source_to_transport_bin(srcpad, transport_agent->priv->pipeline, transport_bin, media_type, codec_type, stream_id)) {
gchar *name = "";
g_object_get(send_source, "name", &name, NULL);
GST_ERROR("Failed to link \"%s\" with transport bin", name);
}
gst_object_unref(srcpad);
gst_element_sync_state_with_parent(src);
}
static void maybe_handle_new_send_source_with_payload(OwrTransportAgent *transport_agent,
OwrMediaSession *media_session)
{
OwrPayload *payload = NULL;
OwrMediaSource *media_source = NULL;
GHashTable *event_data;
GValue *value;
guint stream_id;
gboolean pending;
stream_id = get_stream_id(transport_agent, OWR_SESSION(media_session));
g_return_if_fail(stream_id);
g_mutex_lock(&transport_agent->priv->sessions_lock);
pending = g_hash_table_lookup_extended(transport_agent->priv->pending_sessions, GUINT_TO_POINTER(stream_id), NULL, NULL);
g_mutex_unlock(&transport_agent->priv->sessions_lock);
g_return_if_fail(OWR_IS_TRANSPORT_AGENT(transport_agent));
g_return_if_fail(OWR_IS_MEDIA_SESSION(media_session));
if (!pending &&
(payload = _owr_media_session_get_send_payload(media_session)) &&
(media_source = _owr_media_session_get_send_source(media_session))) {
event_data = _owr_value_table_new();
value = _owr_value_table_add(event_data, "start_time", G_TYPE_INT64);
g_value_set_int64(value, g_get_monotonic_time());
handle_new_send_payload(transport_agent, media_session, payload);
handle_new_send_source(transport_agent, media_session, media_source, payload);
value = _owr_value_table_add(event_data, "end_time", G_TYPE_INT64);
g_value_set_int64(value, g_get_monotonic_time());
OWR_POST_STATS(media_session, SEND_PIPELINE_ADDED, event_data);
}
if (payload)
g_object_unref(payload);
if (media_source)
g_object_unref(media_source);
}
static void remove_existing_send_source_and_payload(OwrTransportAgent *transport_agent, OwrMediaSource *media_source,
OwrMediaSession *media_session)
{
guint stream_id;
gchar *pad_name = NULL, *bin_name;
GstPad *bin_src_pad, *sinkpad;
GstElement *send_input_bin, *source_bin;
OwrMediaType media_type = OWR_MEDIA_TYPE_UNKNOWN;
GHashTable *event_data;
GValue *value;
g_assert(media_source);
event_data = _owr_value_table_new();
value = _owr_value_table_add(event_data, "start_time", G_TYPE_INT64);
g_value_set_int64(value, g_get_monotonic_time());
/* Setting a new, different source but have one already */
stream_id = get_stream_id(transport_agent, OWR_SESSION(media_session));
/* Unlink the source bin */
g_object_get(media_source, "media-type", &media_type, NULL);
g_warn_if_fail(media_type != OWR_MEDIA_TYPE_UNKNOWN);
if (media_type == OWR_MEDIA_TYPE_VIDEO)
pad_name = g_strdup_printf("video_sink_%u_%u", OWR_CODEC_TYPE_NONE, stream_id);
else
pad_name = g_strdup_printf("audio_raw_sink_%u", stream_id);
sinkpad = gst_element_get_static_pad(transport_agent->priv->transport_bin, pad_name);
g_assert(sinkpad);
g_free(pad_name);
bin_src_pad = gst_pad_get_peer(sinkpad);
g_assert(bin_src_pad);
source_bin = GST_ELEMENT(gst_pad_get_parent(bin_src_pad));
g_assert(source_bin);
/* Shutting down will flush immediately */
_owr_media_source_release_source(media_source, source_bin);
gst_element_set_state(source_bin, GST_STATE_NULL);
gst_bin_remove(GST_BIN(transport_agent->priv->pipeline), source_bin);
gst_object_unref(bin_src_pad);
gst_object_unref(source_bin);
/* Now the payload bin */
bin_name = g_strdup_printf("send-input-bin-%u", stream_id);
send_input_bin = gst_bin_get_by_name(GST_BIN(transport_agent->priv->transport_bin), bin_name);
g_assert(send_input_bin);
g_free(bin_name);
gst_element_set_state(send_input_bin, GST_STATE_NULL);
gst_bin_remove(GST_BIN(transport_agent->priv->transport_bin), send_input_bin);
gst_object_unref(send_input_bin);
/* Remove the connecting ghostpad */
gst_pad_set_active(sinkpad, FALSE);
gst_element_remove_pad(transport_agent->priv->transport_bin, sinkpad);
gst_object_unref(sinkpad);
value = _owr_value_table_add(event_data, "end_time", G_TYPE_INT64);
g_value_set_int64(value, g_get_monotonic_time());
OWR_POST_STATS(media_session, SEND_PIPELINE_REMOVED, event_data);
}
static void on_new_send_payload(OwrTransportAgent *transport_agent,
OwrPayload *old_payload, OwrPayload *new_payload,
OwrMediaSession *media_session)
{
g_assert(OWR_IS_TRANSPORT_AGENT(transport_agent));
g_assert(OWR_IS_MEDIA_SESSION(media_session));
g_assert(!new_payload || OWR_IS_PAYLOAD(new_payload));
g_assert(!old_payload || OWR_IS_PAYLOAD(old_payload));
if (old_payload && old_payload != new_payload) {
OwrMediaSource *media_source = _owr_media_session_get_send_source(media_session);
remove_existing_send_source_and_payload(transport_agent, media_source, media_session);
g_object_unref(media_source);
}
if (new_payload && old_payload != new_payload)
maybe_handle_new_send_source_with_payload(transport_agent, media_session);
}
static void on_new_send_source(OwrTransportAgent *transport_agent,
OwrMediaSource *old_media_source, OwrMediaSource *new_media_source,
OwrMediaSession *media_session)
{
g_assert(OWR_IS_TRANSPORT_AGENT(transport_agent));
g_assert(OWR_IS_MEDIA_SESSION(media_session));
g_assert(!new_media_source || OWR_IS_MEDIA_SOURCE(new_media_source));
g_assert(!old_media_source || OWR_IS_MEDIA_SOURCE(old_media_source));
if (old_media_source && old_media_source != new_media_source)
remove_existing_send_source_and_payload(transport_agent, old_media_source, media_session);
if (new_media_source && old_media_source != new_media_source)
maybe_handle_new_send_source_with_payload(transport_agent, media_session);
}
static gboolean add_session(GHashTable *args)
{
OwrTransportAgent *transport_agent;
OwrTransportAgentPrivate *priv;
OwrSession *session;
guint stream_id;
gboolean rtcp_mux = TRUE;
GObject *rtp_session;