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gstreamer/ext/webrtc/gstwebrtcbin.c
Matthew Waters 319a5e5779 webrtc: mark streams as active on renegotiation as well. 
Otherwise when bundling, only the changed streams would be considered as
to whether the bundled transport needs to be blocked as all streams are
inactive.

Scenario is one transceiver changes direction to inactive and as that is
the only change in transciever direction, the entire bundled transport would
be blocked even if there are other active transceivers inside the same bundled
transport that are still active.

Fix by always checking the activeness of a stream regardless of if the
transceiverr has changed direction.
2020-03-25 14:46:15 +11:00

6334 lines
202 KiB
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/* GStreamer
* Copyright (C) 2017 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstwebrtcbin.h"
#include "gstwebrtcstats.h"
#include "transportstream.h"
#include "transportreceivebin.h"
#include "utils.h"
#include "webrtcsdp.h"
#include "webrtctransceiver.h"
#include "webrtcdatachannel.h"
#include "sctptransport.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define RANDOM_SESSION_ID \
((((((guint64) g_random_int()) << 32) | \
(guint64) g_random_int ())) & \
G_GUINT64_CONSTANT (0x7fffffffffffffff))
#define PC_GET_LOCK(w) (&w->priv->pc_lock)
#define PC_LOCK(w) (g_mutex_lock (PC_GET_LOCK(w)))
#define PC_UNLOCK(w) (g_mutex_unlock (PC_GET_LOCK(w)))
#define PC_GET_COND(w) (&w->priv->pc_cond)
#define PC_COND_WAIT(w) (g_cond_wait(PC_GET_COND(w), PC_GET_LOCK(w)))
#define PC_COND_BROADCAST(w) (g_cond_broadcast(PC_GET_COND(w)))
#define PC_COND_SIGNAL(w) (g_cond_signal(PC_GET_COND(w)))
#define ICE_GET_LOCK(w) (&w->priv->ice_lock)
#define ICE_LOCK(w) (g_mutex_lock (ICE_GET_LOCK(w)))
#define ICE_UNLOCK(w) (g_mutex_unlock (ICE_GET_LOCK(w)))
/*
* This webrtcbin implements the majority of the W3's peerconnection API and
* implementation guide where possible. Generating offers, answers and setting
* local and remote SDP's are all supported. Both media descriptions and
* descriptions involving data channels are supported.
*
* Each input/output pad is equivalent to a Track in W3 parlance which are
* added/removed from the bin. The number of requested sink pads is the number
* of streams that will be sent to the receiver and will be associated with a
* GstWebRTCRTPTransceiver (very similar to W3 RTPTransceiver's).
*
* On the receiving side, RTPTransceiver's are created in response to setting
* a remote description. Output pads for the receiving streams in the set
* description are also created when data is received.
*
* A TransportStream is created when needed in order to transport the data over
* the necessary DTLS/ICE channel to the peer. The exact configuration depends
* on the negotiated SDP's between the peers based on the bundle and rtcp
* configuration. Some cases are outlined below for a simple single
* audio/video/data session:
*
* - max-bundle (requires rtcp-muxing) uses a single transport for all
* media/data transported. Renegotiation involves adding/removing the
* necessary streams to the existing transports.
* - max-compat without rtcp-mux involves two TransportStream per media stream
* to transport the rtp and the rtcp packets and a single TransportStream for
* all data channels. Each stream change involves modifying the associated
* TransportStream/s as necessary.
*/
/*
* TODO:
* assert sending payload type matches the stream
* reconfiguration (of anything)
* LS groups
* balanced bundle policy
* setting custom DTLS certificates
*
* separate session id's from mlineindex properly
* how to deal with replacing a input/output track/stream
*/
static void _update_need_negotiation (GstWebRTCBin * webrtc);
#define GST_CAT_DEFAULT gst_webrtc_bin_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
enum
{
PROP_PAD_TRANSCEIVER = 1,
};
static gboolean
_have_nice_elements (GstWebRTCBin * webrtc)
{
GstPluginFeature *feature;
feature = gst_registry_lookup_feature (gst_registry_get (), "nicesrc");
if (feature) {
gst_object_unref (feature);
} else {
GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL,
("%s", "libnice elements are not available"));
return FALSE;
}
feature = gst_registry_lookup_feature (gst_registry_get (), "nicesink");
if (feature) {
gst_object_unref (feature);
} else {
GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL,
("%s", "libnice elements are not available"));
return FALSE;
}
return TRUE;
}
static gboolean
_have_sctp_elements (GstWebRTCBin * webrtc)
{
GstPluginFeature *feature;
feature = gst_registry_lookup_feature (gst_registry_get (), "sctpdec");
if (feature) {
gst_object_unref (feature);
} else {
GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL,
("%s", "sctp elements are not available"));
return FALSE;
}
feature = gst_registry_lookup_feature (gst_registry_get (), "sctpenc");
if (feature) {
gst_object_unref (feature);
} else {
GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL,
("%s", "sctp elements are not available"));
return FALSE;
}
return TRUE;
}
static gboolean
_have_dtls_elements (GstWebRTCBin * webrtc)
{
GstPluginFeature *feature;
feature = gst_registry_lookup_feature (gst_registry_get (), "dtlsdec");
if (feature) {
gst_object_unref (feature);
} else {
GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL,
("%s", "dtls elements are not available"));
return FALSE;
}
feature = gst_registry_lookup_feature (gst_registry_get (), "dtlsenc");
if (feature) {
gst_object_unref (feature);
} else {
GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL,
("%s", "dtls elements are not available"));
return FALSE;
}
return TRUE;
}
G_DEFINE_TYPE (GstWebRTCBinPad, gst_webrtc_bin_pad, GST_TYPE_GHOST_PAD);
static void
gst_webrtc_bin_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_webrtc_bin_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstWebRTCBinPad *pad = GST_WEBRTC_BIN_PAD (object);
switch (prop_id) {
case PROP_PAD_TRANSCEIVER:
g_value_set_object (value, pad->trans);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_webrtc_bin_pad_finalize (GObject * object)
{
GstWebRTCBinPad *pad = GST_WEBRTC_BIN_PAD (object);
if (pad->trans)
gst_object_unref (pad->trans);
pad->trans = NULL;
if (pad->received_caps)
gst_caps_unref (pad->received_caps);
pad->received_caps = NULL;
G_OBJECT_CLASS (gst_webrtc_bin_pad_parent_class)->finalize (object);
}
static void
gst_webrtc_bin_pad_class_init (GstWebRTCBinPadClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->get_property = gst_webrtc_bin_pad_get_property;
gobject_class->set_property = gst_webrtc_bin_pad_set_property;
gobject_class->finalize = gst_webrtc_bin_pad_finalize;
g_object_class_install_property (gobject_class,
PROP_PAD_TRANSCEIVER,
g_param_spec_object ("transceiver", "Transceiver",
"Transceiver associated with this pad",
GST_TYPE_WEBRTC_RTP_TRANSCEIVER,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
}
static gboolean
gst_webrtcbin_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstWebRTCBinPad *wpad = GST_WEBRTC_BIN_PAD (pad);
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (parent);
gboolean check_negotiation = FALSE;
if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) {
GstCaps *caps;
gst_event_parse_caps (event, &caps);
check_negotiation = (!wpad->received_caps
|| gst_caps_is_equal (wpad->received_caps, caps));
gst_caps_replace (&wpad->received_caps, caps);
GST_DEBUG_OBJECT (parent,
"On %" GST_PTR_FORMAT " checking negotiation? %u, caps %"
GST_PTR_FORMAT, pad, check_negotiation, caps);
} else if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
check_negotiation = TRUE;
}
if (check_negotiation) {
PC_LOCK (webrtc);
_update_need_negotiation (webrtc);
PC_UNLOCK (webrtc);
}
return gst_pad_event_default (pad, parent, event);
}
static void
gst_webrtc_bin_pad_init (GstWebRTCBinPad * pad)
{
}
static GstWebRTCBinPad *
gst_webrtc_bin_pad_new (const gchar * name, GstPadDirection direction)
{
GstWebRTCBinPad *pad =
g_object_new (gst_webrtc_bin_pad_get_type (), "name", name, "direction",
direction, NULL);
gst_pad_set_event_function (GST_PAD (pad), gst_webrtcbin_sink_event);
if (!gst_ghost_pad_construct (GST_GHOST_PAD (pad))) {
gst_object_unref (pad);
return NULL;
}
GST_DEBUG_OBJECT (pad, "new visible pad with direction %s",
direction == GST_PAD_SRC ? "src" : "sink");
return pad;
}
#define gst_webrtc_bin_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstWebRTCBin, gst_webrtc_bin, GST_TYPE_BIN,
G_ADD_PRIVATE (GstWebRTCBin)
GST_DEBUG_CATEGORY_INIT (gst_webrtc_bin_debug, "webrtcbin", 0,
"webrtcbin element");
);
static GstPad *_connect_input_stream (GstWebRTCBin * webrtc,
GstWebRTCBinPad * pad);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink_%u",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("application/x-rtp"));
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("application/x-rtp"));
enum
{
SIGNAL_0,
CREATE_OFFER_SIGNAL,
CREATE_ANSWER_SIGNAL,
SET_LOCAL_DESCRIPTION_SIGNAL,
SET_REMOTE_DESCRIPTION_SIGNAL,
ADD_ICE_CANDIDATE_SIGNAL,
ON_NEGOTIATION_NEEDED_SIGNAL,
ON_ICE_CANDIDATE_SIGNAL,
ON_NEW_TRANSCEIVER_SIGNAL,
GET_STATS_SIGNAL,
ADD_TRANSCEIVER_SIGNAL,
GET_TRANSCEIVER_SIGNAL,
GET_TRANSCEIVERS_SIGNAL,
ADD_TURN_SERVER_SIGNAL,
CREATE_DATA_CHANNEL_SIGNAL,
ON_DATA_CHANNEL_SIGNAL,
LAST_SIGNAL,
};
enum
{
PROP_0,
PROP_CONNECTION_STATE,
PROP_SIGNALING_STATE,
PROP_ICE_GATHERING_STATE,
PROP_ICE_CONNECTION_STATE,
PROP_LOCAL_DESCRIPTION,
PROP_CURRENT_LOCAL_DESCRIPTION,
PROP_PENDING_LOCAL_DESCRIPTION,
PROP_REMOTE_DESCRIPTION,
PROP_CURRENT_REMOTE_DESCRIPTION,
PROP_PENDING_REMOTE_DESCRIPTION,
PROP_STUN_SERVER,
PROP_TURN_SERVER,
PROP_BUNDLE_POLICY,
PROP_ICE_TRANSPORT_POLICY,
};
static guint gst_webrtc_bin_signals[LAST_SIGNAL] = { 0 };
typedef struct
{
guint session_id;
GstWebRTCICEStream *stream;
} IceStreamItem;
/* FIXME: locking? */
GstWebRTCICEStream *
_find_ice_stream_for_session (GstWebRTCBin * webrtc, guint session_id)
{
int i;
for (i = 0; i < webrtc->priv->ice_stream_map->len; i++) {
IceStreamItem *item =
&g_array_index (webrtc->priv->ice_stream_map, IceStreamItem, i);
if (item->session_id == session_id) {
GST_TRACE_OBJECT (webrtc, "Found ice stream id %" GST_PTR_FORMAT " for "
"session %u", item->stream, session_id);
return item->stream;
}
}
GST_TRACE_OBJECT (webrtc, "No ice stream available for session %u",
session_id);
return NULL;
}
void
_add_ice_stream_item (GstWebRTCBin * webrtc, guint session_id,
GstWebRTCICEStream * stream)
{
IceStreamItem item = { session_id, stream };
GST_TRACE_OBJECT (webrtc, "adding ice stream %" GST_PTR_FORMAT " for "
"session %u", stream, session_id);
g_array_append_val (webrtc->priv->ice_stream_map, item);
}
typedef struct
{
guint session_id;
gchar *mid;
} SessionMidItem;
static void
clear_session_mid_item (SessionMidItem * item)
{
g_free (item->mid);
}
typedef gboolean (*FindTransceiverFunc) (GstWebRTCRTPTransceiver * p1,
gconstpointer data);
static GstWebRTCRTPTransceiver *
_find_transceiver (GstWebRTCBin * webrtc, gconstpointer data,
FindTransceiverFunc func)
{
int i;
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *transceiver =
g_ptr_array_index (webrtc->priv->transceivers, i);
if (func (transceiver, data))
return transceiver;
}
return NULL;
}
static gboolean
match_for_mid (GstWebRTCRTPTransceiver * trans, const gchar * mid)
{
return g_strcmp0 (trans->mid, mid) == 0;
}
static gboolean
transceiver_match_for_mline (GstWebRTCRTPTransceiver * trans, guint * mline)
{
return trans->mline == *mline;
}
static GstWebRTCRTPTransceiver *
_find_transceiver_for_mline (GstWebRTCBin * webrtc, guint mlineindex)
{
GstWebRTCRTPTransceiver *trans;
trans = _find_transceiver (webrtc, &mlineindex,
(FindTransceiverFunc) transceiver_match_for_mline);
GST_TRACE_OBJECT (webrtc,
"Found transceiver %" GST_PTR_FORMAT " for mlineindex %u", trans,
mlineindex);
return trans;
}
typedef gboolean (*FindTransportFunc) (TransportStream * p1,
gconstpointer data);
static TransportStream *
_find_transport (GstWebRTCBin * webrtc, gconstpointer data,
FindTransportFunc func)
{
int i;
for (i = 0; i < webrtc->priv->transports->len; i++) {
TransportStream *stream = g_ptr_array_index (webrtc->priv->transports, i);
if (func (stream, data))
return stream;
}
return NULL;
}
static gboolean
match_stream_for_session (TransportStream * trans, guint * session)
{
return trans->session_id == *session;
}
static TransportStream *
_find_transport_for_session (GstWebRTCBin * webrtc, guint session_id)
{
TransportStream *stream;
stream = _find_transport (webrtc, &session_id,
(FindTransportFunc) match_stream_for_session);
GST_TRACE_OBJECT (webrtc,
"Found transport %" GST_PTR_FORMAT " for session %u", stream, session_id);
return stream;
}
typedef gboolean (*FindPadFunc) (GstWebRTCBinPad * p1, gconstpointer data);
static GstWebRTCBinPad *
_find_pad (GstWebRTCBin * webrtc, gconstpointer data, FindPadFunc func)
{
GstElement *element = GST_ELEMENT (webrtc);
GList *l;
GST_OBJECT_LOCK (webrtc);
l = element->pads;
for (; l; l = g_list_next (l)) {
if (!GST_IS_WEBRTC_BIN_PAD (l->data))
continue;
if (func (l->data, data)) {
gst_object_ref (l->data);
GST_OBJECT_UNLOCK (webrtc);
return l->data;
}
}
l = webrtc->priv->pending_pads;
for (; l; l = g_list_next (l)) {
if (!GST_IS_WEBRTC_BIN_PAD (l->data))
continue;
if (func (l->data, data)) {
gst_object_ref (l->data);
GST_OBJECT_UNLOCK (webrtc);
return l->data;
}
}
GST_OBJECT_UNLOCK (webrtc);
return NULL;
}
typedef gboolean (*FindDataChannelFunc) (GstWebRTCDataChannel * p1,
gconstpointer data);
static GstWebRTCDataChannel *
_find_data_channel (GstWebRTCBin * webrtc, gconstpointer data,
FindDataChannelFunc func)
{
int i;
for (i = 0; i < webrtc->priv->data_channels->len; i++) {
GstWebRTCDataChannel *channel =
g_ptr_array_index (webrtc->priv->data_channels, i);
if (func (channel, data))
return channel;
}
return NULL;
}
static gboolean
data_channel_match_for_id (GstWebRTCDataChannel * channel, gint * id)
{
return channel->id == *id;
}
static GstWebRTCDataChannel *
_find_data_channel_for_id (GstWebRTCBin * webrtc, gint id)
{
GstWebRTCDataChannel *channel;
channel = _find_data_channel (webrtc, &id,
(FindDataChannelFunc) data_channel_match_for_id);
GST_TRACE_OBJECT (webrtc,
"Found data channel %" GST_PTR_FORMAT " for id %i", channel, id);
return channel;
}
static void
_add_pad_to_list (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad)
{
GST_OBJECT_LOCK (webrtc);
webrtc->priv->pending_pads = g_list_prepend (webrtc->priv->pending_pads, pad);
GST_OBJECT_UNLOCK (webrtc);
}
static void
_remove_pending_pad (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad)
{
GST_OBJECT_LOCK (webrtc);
webrtc->priv->pending_pads = g_list_remove (webrtc->priv->pending_pads, pad);
GST_OBJECT_UNLOCK (webrtc);
}
static void
_add_pad (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad)
{
_remove_pending_pad (webrtc, pad);
if (webrtc->priv->running)
gst_pad_set_active (GST_PAD (pad), TRUE);
gst_element_add_pad (GST_ELEMENT (webrtc), GST_PAD (pad));
}
static void
_remove_pad (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad)
{
_remove_pending_pad (webrtc, pad);
gst_element_remove_pad (GST_ELEMENT (webrtc), GST_PAD (pad));
}
typedef struct
{
GstPadDirection direction;
guint mlineindex;
} MLineMatch;
static gboolean
pad_match_for_mline (GstWebRTCBinPad * pad, const MLineMatch * match)
{
return GST_PAD_DIRECTION (pad) == match->direction
&& pad->mlineindex == match->mlineindex;
}
static GstWebRTCBinPad *
_find_pad_for_mline (GstWebRTCBin * webrtc, GstPadDirection direction,
guint mlineindex)
{
MLineMatch m = { direction, mlineindex };
return _find_pad (webrtc, &m, (FindPadFunc) pad_match_for_mline);
}
typedef struct
{
GstPadDirection direction;
GstWebRTCRTPTransceiver *trans;
} TransMatch;
static gboolean
pad_match_for_transceiver (GstWebRTCBinPad * pad, TransMatch * m)
{
return GST_PAD_DIRECTION (pad) == m->direction && pad->trans == m->trans;
}
static GstWebRTCBinPad *
_find_pad_for_transceiver (GstWebRTCBin * webrtc, GstPadDirection direction,
GstWebRTCRTPTransceiver * trans)
{
TransMatch m = { direction, trans };
return _find_pad (webrtc, &m, (FindPadFunc) pad_match_for_transceiver);
}
#if 0
static gboolean
match_for_ssrc (GstWebRTCBinPad * pad, guint * ssrc)
{
return pad->ssrc == *ssrc;
}
static gboolean
match_for_pad (GstWebRTCBinPad * pad, GstWebRTCBinPad * other)
{
return pad == other;
}
#endif
static gboolean
_unlock_pc_thread (GMutex * lock)
{
g_mutex_unlock (lock);
return G_SOURCE_REMOVE;
}
static gpointer
_gst_pc_thread (GstWebRTCBin * webrtc)
{
PC_LOCK (webrtc);
webrtc->priv->main_context = g_main_context_new ();
webrtc->priv->loop = g_main_loop_new (webrtc->priv->main_context, FALSE);
PC_COND_BROADCAST (webrtc);
g_main_context_invoke (webrtc->priv->main_context,
(GSourceFunc) _unlock_pc_thread, PC_GET_LOCK (webrtc));
/* Having the thread be the thread default GMainContext will break the
* required queue-like ordering (from W3's peerconnection spec) of re-entrant
* tasks */
g_main_loop_run (webrtc->priv->loop);
PC_LOCK (webrtc);
g_main_context_unref (webrtc->priv->main_context);
webrtc->priv->main_context = NULL;
g_main_loop_unref (webrtc->priv->loop);
webrtc->priv->loop = NULL;
PC_COND_BROADCAST (webrtc);
PC_UNLOCK (webrtc);
return NULL;
}
static void
_start_thread (GstWebRTCBin * webrtc)
{
PC_LOCK (webrtc);
webrtc->priv->thread = g_thread_new ("gst-pc-ops",
(GThreadFunc) _gst_pc_thread, webrtc);
while (!webrtc->priv->loop)
PC_COND_WAIT (webrtc);
webrtc->priv->is_closed = FALSE;
PC_UNLOCK (webrtc);
}
static void
_stop_thread (GstWebRTCBin * webrtc)
{
PC_LOCK (webrtc);
webrtc->priv->is_closed = TRUE;
g_main_loop_quit (webrtc->priv->loop);
while (webrtc->priv->loop)
PC_COND_WAIT (webrtc);
PC_UNLOCK (webrtc);
g_thread_unref (webrtc->priv->thread);
}
static gboolean
_execute_op (GstWebRTCBinTask * op)
{
PC_LOCK (op->webrtc);
if (op->webrtc->priv->is_closed) {
GST_DEBUG_OBJECT (op->webrtc,
"Peerconnection is closed, aborting execution");
goto out;
}
op->op (op->webrtc, op->data);
out:
PC_UNLOCK (op->webrtc);
return G_SOURCE_REMOVE;
}
static void
_free_op (GstWebRTCBinTask * op)
{
if (op->notify)
op->notify (op->data);
g_free (op);
}
void
gst_webrtc_bin_enqueue_task (GstWebRTCBin * webrtc, GstWebRTCBinFunc func,
gpointer data, GDestroyNotify notify)
{
GstWebRTCBinTask *op;
GSource *source;
g_return_if_fail (GST_IS_WEBRTC_BIN (webrtc));
if (webrtc->priv->is_closed) {
GST_DEBUG_OBJECT (webrtc, "Peerconnection is closed, aborting execution");
if (notify)
notify (data);
return;
}
op = g_new0 (GstWebRTCBinTask, 1);
op->webrtc = webrtc;
op->op = func;
op->data = data;
op->notify = notify;
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, (GSourceFunc) _execute_op, op,
(GDestroyNotify) _free_op);
g_source_attach (source, webrtc->priv->main_context);
g_source_unref (source);
}
/* https://www.w3.org/TR/webrtc/#dom-rtciceconnectionstate */
static GstWebRTCICEConnectionState
_collate_ice_connection_states (GstWebRTCBin * webrtc)
{
#define STATE(val) GST_WEBRTC_ICE_CONNECTION_STATE_ ## val
GstWebRTCICEConnectionState any_state = 0;
gboolean all_new_or_closed = TRUE;
gboolean all_completed_or_closed = TRUE;
gboolean all_connected_completed_or_closed = TRUE;
int i;
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *rtp_trans =
g_ptr_array_index (webrtc->priv->transceivers, i);
WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans);
TransportStream *stream = trans->stream;
GstWebRTCICETransport *transport, *rtcp_transport;
GstWebRTCICEConnectionState ice_state;
gboolean rtcp_mux = FALSE;
if (rtp_trans->stopped) {
GST_TRACE_OBJECT (webrtc, "transceiver %p stopped", rtp_trans);
continue;
}
if (!rtp_trans->mid) {
GST_TRACE_OBJECT (webrtc, "transceiver %p has no mid", rtp_trans);
continue;
}
g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL);
transport = webrtc_transceiver_get_dtls_transport (rtp_trans)->transport;
/* get transport state */
g_object_get (transport, "state", &ice_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p state 0x%x", rtp_trans,
ice_state);
any_state |= (1 << ice_state);
if (ice_state != STATE (NEW) && ice_state != STATE (CLOSED))
all_new_or_closed = FALSE;
if (ice_state != STATE (COMPLETED) && ice_state != STATE (CLOSED))
all_completed_or_closed = FALSE;
if (ice_state != STATE (CONNECTED) && ice_state != STATE (COMPLETED)
&& ice_state != STATE (CLOSED))
all_connected_completed_or_closed = FALSE;
rtcp_transport =
webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans)->transport;
if (!rtcp_mux && rtcp_transport && transport != rtcp_transport) {
g_object_get (rtcp_transport, "state", &ice_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP state 0x%x", rtp_trans,
ice_state);
any_state |= (1 << ice_state);
if (ice_state != STATE (NEW) && ice_state != STATE (CLOSED))
all_new_or_closed = FALSE;
if (ice_state != STATE (COMPLETED) && ice_state != STATE (CLOSED))
all_completed_or_closed = FALSE;
if (ice_state != STATE (CONNECTED) && ice_state != STATE (COMPLETED)
&& ice_state != STATE (CLOSED))
all_connected_completed_or_closed = FALSE;
}
}
GST_TRACE_OBJECT (webrtc, "ICE connection state: 0x%x", any_state);
if (webrtc->priv->is_closed) {
GST_TRACE_OBJECT (webrtc, "returning closed");
return STATE (CLOSED);
}
/* Any of the RTCIceTransports are in the failed state. */
if (any_state & (1 << STATE (FAILED))) {
GST_TRACE_OBJECT (webrtc, "returning failed");
return STATE (FAILED);
}
/* Any of the RTCIceTransports are in the disconnected state. */
if (any_state & (1 << STATE (DISCONNECTED))) {
GST_TRACE_OBJECT (webrtc, "returning disconnected");
return STATE (DISCONNECTED);
}
/* All of the RTCIceTransports are in the new or closed state, or there are
* no transports. */
if (all_new_or_closed || webrtc->priv->transceivers->len == 0) {
GST_TRACE_OBJECT (webrtc, "returning new");
return STATE (NEW);
}
/* Any of the RTCIceTransports are in the checking or new state. */
if ((any_state & (1 << STATE (CHECKING))) || (any_state & (1 << STATE (NEW)))) {
GST_TRACE_OBJECT (webrtc, "returning checking");
return STATE (CHECKING);
}
/* All RTCIceTransports are in the completed or closed state. */
if (all_completed_or_closed) {
GST_TRACE_OBJECT (webrtc, "returning completed");
return STATE (COMPLETED);
}
/* All RTCIceTransports are in the connected, completed or closed state. */
if (all_connected_completed_or_closed) {
GST_TRACE_OBJECT (webrtc, "returning connected");
return STATE (CONNECTED);
}
GST_FIXME ("unspecified situation, returning old state");
return webrtc->ice_connection_state;
#undef STATE
}
/* https://www.w3.org/TR/webrtc/#dom-rtcicegatheringstate */
static GstWebRTCICEGatheringState
_collate_ice_gathering_states (GstWebRTCBin * webrtc)
{
#define STATE(val) GST_WEBRTC_ICE_GATHERING_STATE_ ## val
GstWebRTCICEGatheringState any_state = 0;
gboolean all_completed = webrtc->priv->transceivers->len > 0;
int i;
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *rtp_trans =
g_ptr_array_index (webrtc->priv->transceivers, i);
WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans);
TransportStream *stream = trans->stream;
GstWebRTCDTLSTransport *dtls_transport;
GstWebRTCICETransport *transport, *rtcp_transport;
GstWebRTCICEGatheringState ice_state;
gboolean rtcp_mux = FALSE;
if (rtp_trans->stopped || stream == NULL) {
GST_TRACE_OBJECT (webrtc, "transceiver %p stopped or unassociated",
rtp_trans);
continue;
}
/* We only have a mid in the transceiver after we got the SDP answer,
* which is usually long after gathering has finished */
if (!rtp_trans->mid) {
GST_TRACE_OBJECT (webrtc, "transceiver %p has no mid", rtp_trans);
}
g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL);
dtls_transport = webrtc_transceiver_get_dtls_transport (rtp_trans);
if (dtls_transport == NULL) {
GST_WARNING ("Transceiver %p has no DTLS transport", rtp_trans);
continue;
}
transport = dtls_transport->transport;
/* get gathering state */
g_object_get (transport, "gathering-state", &ice_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p gathering state: 0x%x", rtp_trans,
ice_state);
any_state |= (1 << ice_state);
if (ice_state != STATE (COMPLETE))
all_completed = FALSE;
dtls_transport = webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans);
if (dtls_transport == NULL) {
GST_WARNING ("Transceiver %p has no DTLS RTCP transport", rtp_trans);
continue;
}
rtcp_transport = dtls_transport->transport;
if (!rtcp_mux && rtcp_transport && rtcp_transport != transport) {
g_object_get (rtcp_transport, "gathering-state", &ice_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP gathering state: 0x%x",
rtp_trans, ice_state);
any_state |= (1 << ice_state);
if (ice_state != STATE (COMPLETE))
all_completed = FALSE;
}
}
GST_TRACE_OBJECT (webrtc, "ICE gathering state: 0x%x", any_state);
/* Any of the RTCIceTransport s are in the gathering state. */
if (any_state & (1 << STATE (GATHERING))) {
GST_TRACE_OBJECT (webrtc, "returning gathering");
return STATE (GATHERING);
}
/* At least one RTCIceTransport exists, and all RTCIceTransport s are in
* the completed gathering state. */
if (all_completed) {
GST_TRACE_OBJECT (webrtc, "returning complete");
return STATE (COMPLETE);
}
/* Any of the RTCIceTransport s are in the new gathering state and none
* of the transports are in the gathering state, or there are no transports. */
GST_TRACE_OBJECT (webrtc, "returning new");
return STATE (NEW);
#undef STATE
}
/* https://www.w3.org/TR/webrtc/#rtcpeerconnectionstate-enum */
static GstWebRTCPeerConnectionState
_collate_peer_connection_states (GstWebRTCBin * webrtc)
{
#define STATE(v) GST_WEBRTC_PEER_CONNECTION_STATE_ ## v
#define ICE_STATE(v) GST_WEBRTC_ICE_CONNECTION_STATE_ ## v
#define DTLS_STATE(v) GST_WEBRTC_DTLS_TRANSPORT_STATE_ ## v
GstWebRTCICEConnectionState any_ice_state = 0;
GstWebRTCDTLSTransportState any_dtls_state = 0;
gboolean ice_all_new_or_closed = TRUE;
gboolean dtls_all_new_or_closed = TRUE;
gboolean ice_all_new_connecting_or_checking = TRUE;
gboolean dtls_all_new_connecting_or_checking = TRUE;
gboolean ice_all_connected_completed_or_closed = TRUE;
gboolean dtls_all_connected_completed_or_closed = TRUE;
int i;
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *rtp_trans =
g_ptr_array_index (webrtc->priv->transceivers, i);
WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans);
TransportStream *stream = trans->stream;
GstWebRTCDTLSTransport *transport, *rtcp_transport;
GstWebRTCICEConnectionState ice_state;
GstWebRTCDTLSTransportState dtls_state;
gboolean rtcp_mux = FALSE;
if (rtp_trans->stopped) {
GST_TRACE_OBJECT (webrtc, "transceiver %p stopped", rtp_trans);
continue;
}
if (!rtp_trans->mid) {
GST_TRACE_OBJECT (webrtc, "transceiver %p has no mid", rtp_trans);
continue;
}
g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL);
transport = webrtc_transceiver_get_dtls_transport (rtp_trans);
/* get transport state */
g_object_get (transport, "state", &dtls_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p DTLS state: 0x%x", rtp_trans,
dtls_state);
any_dtls_state |= (1 << dtls_state);
if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CLOSED))
dtls_all_new_or_closed = FALSE;
if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CONNECTING))
dtls_all_new_connecting_or_checking = FALSE;
if (dtls_state != DTLS_STATE (CONNECTED)
&& dtls_state != DTLS_STATE (CLOSED))
dtls_all_connected_completed_or_closed = FALSE;
g_object_get (transport->transport, "state", &ice_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p ICE state: 0x%x", rtp_trans,
ice_state);
any_ice_state |= (1 << ice_state);
if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CLOSED))
ice_all_new_or_closed = FALSE;
if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CHECKING))
ice_all_new_connecting_or_checking = FALSE;
if (ice_state != ICE_STATE (CONNECTED) && ice_state != ICE_STATE (COMPLETED)
&& ice_state != ICE_STATE (CLOSED))
ice_all_connected_completed_or_closed = FALSE;
rtcp_transport = webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans);
if (!rtcp_mux && rtcp_transport && rtcp_transport != transport) {
g_object_get (rtcp_transport, "state", &dtls_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP DTLS state: 0x%x",
rtp_trans, dtls_state);
any_dtls_state |= (1 << dtls_state);
if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CLOSED))
dtls_all_new_or_closed = FALSE;
if (dtls_state != DTLS_STATE (NEW)
&& dtls_state != DTLS_STATE (CONNECTING))
dtls_all_new_connecting_or_checking = FALSE;
if (dtls_state != DTLS_STATE (CONNECTED)
&& dtls_state != DTLS_STATE (CLOSED))
dtls_all_connected_completed_or_closed = FALSE;
g_object_get (rtcp_transport->transport, "state", &ice_state, NULL);
GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP ICE state: 0x%x",
rtp_trans, ice_state);
any_ice_state |= (1 << ice_state);
if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CLOSED))
ice_all_new_or_closed = FALSE;
if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CHECKING))
ice_all_new_connecting_or_checking = FALSE;
if (ice_state != ICE_STATE (CONNECTED)
&& ice_state != ICE_STATE (COMPLETED)
&& ice_state != ICE_STATE (CLOSED))
ice_all_connected_completed_or_closed = FALSE;
}
}
GST_TRACE_OBJECT (webrtc, "ICE connection state: 0x%x. DTLS connection "
"state: 0x%x", any_ice_state, any_dtls_state);
/* The RTCPeerConnection object's [[ isClosed]] slot is true. */
if (webrtc->priv->is_closed) {
GST_TRACE_OBJECT (webrtc, "returning closed");
return STATE (CLOSED);
}
/* Any of the RTCIceTransport s or RTCDtlsTransport s are in a failed state. */
if (any_ice_state & (1 << ICE_STATE (FAILED))) {
GST_TRACE_OBJECT (webrtc, "returning failed");
return STATE (FAILED);
}
if (any_dtls_state & (1 << DTLS_STATE (FAILED))) {
GST_TRACE_OBJECT (webrtc, "returning failed");
return STATE (FAILED);
}
/* Any of the RTCIceTransport's or RTCDtlsTransport's are in the disconnected
* state. */
if (any_ice_state & (1 << ICE_STATE (DISCONNECTED))) {
GST_TRACE_OBJECT (webrtc, "returning disconnected");
return STATE (DISCONNECTED);
}
/* All RTCIceTransports and RTCDtlsTransports are in the new or closed
* state, or there are no transports. */
if ((dtls_all_new_or_closed && ice_all_new_or_closed)
|| webrtc->priv->transceivers->len == 0) {
GST_TRACE_OBJECT (webrtc, "returning new");
return STATE (NEW);
}
/* All RTCIceTransports and RTCDtlsTransports are in the new, connecting
* or checking state. */
if (dtls_all_new_connecting_or_checking && ice_all_new_connecting_or_checking) {
GST_TRACE_OBJECT (webrtc, "returning connecting");
return STATE (CONNECTING);
}
/* All RTCIceTransports and RTCDtlsTransports are in the connected,
* completed or closed state. */
if (dtls_all_connected_completed_or_closed
&& ice_all_connected_completed_or_closed) {
GST_TRACE_OBJECT (webrtc, "returning connected");
return STATE (CONNECTED);
}
/* FIXME: Unspecified state that happens for us */
if ((dtls_all_new_connecting_or_checking
|| dtls_all_connected_completed_or_closed)
&& (ice_all_new_connecting_or_checking
|| ice_all_connected_completed_or_closed)) {
GST_TRACE_OBJECT (webrtc, "returning connecting");
return STATE (CONNECTING);
}
GST_FIXME_OBJECT (webrtc,
"Undefined situation detected, returning old state");
return webrtc->peer_connection_state;
#undef DTLS_STATE
#undef ICE_STATE
#undef STATE
}
static void
_update_ice_gathering_state_task (GstWebRTCBin * webrtc, gpointer data)
{
GstWebRTCICEGatheringState old_state = webrtc->ice_gathering_state;
GstWebRTCICEGatheringState new_state;
new_state = _collate_ice_gathering_states (webrtc);
/* If the new state is complete, before we update the public state,
* check if anyone published more ICE candidates while we were collating
* and stop if so, because it means there's a new later
* ice_gathering_state_task queued */
if (new_state == GST_WEBRTC_ICE_GATHERING_STATE_COMPLETE) {
ICE_LOCK (webrtc);
if (webrtc->priv->pending_local_ice_candidates->len != 0) {
/* ICE candidates queued for emissiong -> we're gathering, not complete */
new_state = GST_WEBRTC_ICE_GATHERING_STATE_GATHERING;
}
ICE_UNLOCK (webrtc);
}
if (new_state != webrtc->ice_gathering_state) {
gchar *old_s, *new_s;
old_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_GATHERING_STATE,
old_state);
new_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_GATHERING_STATE,
new_state);
GST_INFO_OBJECT (webrtc, "ICE gathering state change from %s(%u) to %s(%u)",
old_s, old_state, new_s, new_state);
g_free (old_s);
g_free (new_s);
webrtc->ice_gathering_state = new_state;
PC_UNLOCK (webrtc);
g_object_notify (G_OBJECT (webrtc), "ice-gathering-state");
PC_LOCK (webrtc);
}
}
static void
_update_ice_gathering_state (GstWebRTCBin * webrtc)
{
gst_webrtc_bin_enqueue_task (webrtc, _update_ice_gathering_state_task, NULL,
NULL);
}
static void
_update_ice_connection_state_task (GstWebRTCBin * webrtc, gpointer data)
{
GstWebRTCICEConnectionState old_state = webrtc->ice_connection_state;
GstWebRTCICEConnectionState new_state;
new_state = _collate_ice_connection_states (webrtc);
if (new_state != old_state) {
gchar *old_s, *new_s;
old_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_CONNECTION_STATE,
old_state);
new_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_CONNECTION_STATE,
new_state);
GST_INFO_OBJECT (webrtc,
"ICE connection state change from %s(%u) to %s(%u)", old_s, old_state,
new_s, new_state);
g_free (old_s);
g_free (new_s);
webrtc->ice_connection_state = new_state;
PC_UNLOCK (webrtc);
g_object_notify (G_OBJECT (webrtc), "ice-connection-state");
PC_LOCK (webrtc);
}
}
static void
_update_ice_connection_state (GstWebRTCBin * webrtc)
{
gst_webrtc_bin_enqueue_task (webrtc, _update_ice_connection_state_task, NULL,
NULL);
}
static void
_update_peer_connection_state_task (GstWebRTCBin * webrtc, gpointer data)
{
GstWebRTCPeerConnectionState old_state = webrtc->peer_connection_state;
GstWebRTCPeerConnectionState new_state;
new_state = _collate_peer_connection_states (webrtc);
if (new_state != old_state) {
gchar *old_s, *new_s;
old_s = _enum_value_to_string (GST_TYPE_WEBRTC_PEER_CONNECTION_STATE,
old_state);
new_s = _enum_value_to_string (GST_TYPE_WEBRTC_PEER_CONNECTION_STATE,
new_state);
GST_INFO_OBJECT (webrtc,
"Peer connection state change from %s(%u) to %s(%u)", old_s, old_state,
new_s, new_state);
g_free (old_s);
g_free (new_s);
webrtc->peer_connection_state = new_state;
PC_UNLOCK (webrtc);
g_object_notify (G_OBJECT (webrtc), "connection-state");
PC_LOCK (webrtc);
}
}
static void
_update_peer_connection_state (GstWebRTCBin * webrtc)
{
gst_webrtc_bin_enqueue_task (webrtc, _update_peer_connection_state_task,
NULL, NULL);
}
static gboolean
_all_sinks_have_caps (GstWebRTCBin * webrtc)
{
GList *l;
gboolean res = FALSE;
GST_OBJECT_LOCK (webrtc);
l = GST_ELEMENT (webrtc)->pads;
for (; l; l = g_list_next (l)) {
GstWebRTCBinPad *wpad;
if (!GST_IS_WEBRTC_BIN_PAD (l->data))
continue;
wpad = GST_WEBRTC_BIN_PAD (l->data);
if (GST_PAD_DIRECTION (l->data) == GST_PAD_SINK && !wpad->received_caps
&& (!wpad->trans || !wpad->trans->stopped)) {
goto done;
}
}
l = webrtc->priv->pending_pads;
for (; l; l = g_list_next (l)) {
if (!GST_IS_WEBRTC_BIN_PAD (l->data)) {
goto done;
}
}
res = TRUE;
done:
GST_OBJECT_UNLOCK (webrtc);
return res;
}
/* http://w3c.github.io/webrtc-pc/#dfn-check-if-negotiation-is-needed */
static gboolean
_check_if_negotiation_is_needed (GstWebRTCBin * webrtc)
{
int i;
GST_LOG_OBJECT (webrtc, "checking if negotiation is needed");
/* We can't negotiate until we have received caps on all our sink pads,
* as we will need the ssrcs in our offer / answer */
if (!_all_sinks_have_caps (webrtc)) {
GST_LOG_OBJECT (webrtc,
"no negotiation possible until caps have been received on all sink pads");
return FALSE;
}
/* If any implementation-specific negotiation is required, as described at
* the start of this section, return "true".
* FIXME */
/* FIXME: emit when input caps/format changes? */
if (!webrtc->current_local_description) {
GST_LOG_OBJECT (webrtc, "no local description set");
return TRUE;
}
if (!webrtc->current_remote_description) {
GST_LOG_OBJECT (webrtc, "no remote description set");
return TRUE;
}
/* If connection has created any RTCDataChannel's, and no m= section has
* been negotiated yet for data, return "true". */
if (webrtc->priv->data_channels->len > 0) {
if (_message_get_datachannel_index (webrtc->current_local_description->
sdp) >= G_MAXUINT) {
GST_LOG_OBJECT (webrtc,
"no data channel media section and have %u " "transports",
webrtc->priv->data_channels->len);
return TRUE;
}
}
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *trans;
trans = g_ptr_array_index (webrtc->priv->transceivers, i);
if (trans->stopped) {
/* FIXME: If t is stopped and is associated with an m= section according to
* [JSEP] (section 3.4.1.), but the associated m= section is not yet
* rejected in connection's currentLocalDescription or
* currentRemoteDescription , return "true". */
GST_FIXME_OBJECT (webrtc,
"check if the transceiver is rejected in descriptions");
} else {
const GstSDPMedia *media;
GstWebRTCRTPTransceiverDirection local_dir, remote_dir;
if (trans->mline == -1 || trans->mid == NULL) {
GST_LOG_OBJECT (webrtc, "unassociated transceiver %i %" GST_PTR_FORMAT
" mid %s", i, trans, trans->mid);
return TRUE;
}
/* internal inconsistency */
g_assert (trans->mline <
gst_sdp_message_medias_len (webrtc->current_local_description->sdp));
g_assert (trans->mline <
gst_sdp_message_medias_len (webrtc->current_remote_description->sdp));
/* FIXME: msid handling
* If t's direction is "sendrecv" or "sendonly", and the associated m=
* section in connection's currentLocalDescription doesn't contain an
* "a=msid" line, return "true". */
media =
gst_sdp_message_get_media (webrtc->current_local_description->sdp,
trans->mline);
local_dir = _get_direction_from_media (media);
media =
gst_sdp_message_get_media (webrtc->current_remote_description->sdp,
trans->mline);
remote_dir = _get_direction_from_media (media);
if (webrtc->current_local_description->type == GST_WEBRTC_SDP_TYPE_OFFER) {
/* If connection's currentLocalDescription if of type "offer", and
* the direction of the associated m= section in neither the offer
* nor answer matches t's direction, return "true". */
if (local_dir != trans->direction && remote_dir != trans->direction) {
gchar *local_str, *remote_str, *dir_str;
local_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
local_dir);
remote_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
remote_dir);
dir_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
trans->direction);
GST_LOG_OBJECT (webrtc, "transceiver direction (%s) doesn't match "
"description (local %s remote %s)", dir_str, local_str,
remote_str);
g_free (dir_str);
g_free (local_str);
g_free (remote_str);
return TRUE;
}
} else if (webrtc->current_local_description->type ==
GST_WEBRTC_SDP_TYPE_ANSWER) {
GstWebRTCRTPTransceiverDirection intersect_dir;
/* If connection's currentLocalDescription if of type "answer", and
* the direction of the associated m= section in the answer does not
* match t's direction intersected with the offered direction (as
* described in [JSEP] (section 5.3.1.)), return "true". */
/* remote is the offer, local is the answer */
intersect_dir = _intersect_answer_directions (remote_dir, local_dir);
if (intersect_dir != trans->direction) {
gchar *local_str, *remote_str, *inter_str, *dir_str;
local_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
local_dir);
remote_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
remote_dir);
dir_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
trans->direction);
inter_str =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
intersect_dir);
GST_LOG_OBJECT (webrtc, "transceiver direction (%s) doesn't match "
"description intersected direction %s (local %s remote %s)",
dir_str, local_str, inter_str, remote_str);
g_free (dir_str);
g_free (local_str);
g_free (remote_str);
g_free (inter_str);
return TRUE;
}
}
}
}
GST_LOG_OBJECT (webrtc, "no negotiation needed");
return FALSE;
}
static void
_check_need_negotiation_task (GstWebRTCBin * webrtc, gpointer unused)
{
if (webrtc->priv->need_negotiation) {
GST_TRACE_OBJECT (webrtc, "emitting on-negotiation-needed");
PC_UNLOCK (webrtc);
g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_NEGOTIATION_NEEDED_SIGNAL],
0);
PC_LOCK (webrtc);
}
}
/* http://w3c.github.io/webrtc-pc/#dfn-update-the-negotiation-needed-flag */
static void
_update_need_negotiation (GstWebRTCBin * webrtc)
{
/* If connection's [[isClosed]] slot is true, abort these steps. */
if (webrtc->priv->is_closed)
return;
/* If connection's signaling state is not "stable", abort these steps. */
if (webrtc->signaling_state != GST_WEBRTC_SIGNALING_STATE_STABLE)
return;
/* If the result of checking if negotiation is needed is "false", clear the
* negotiation-needed flag by setting connection's [[ needNegotiation]] slot
* to false, and abort these steps. */
if (!_check_if_negotiation_is_needed (webrtc)) {
webrtc->priv->need_negotiation = FALSE;
return;
}
/* If connection's [[needNegotiation]] slot is already true, abort these steps. */
if (webrtc->priv->need_negotiation)
return;
/* Set connection's [[needNegotiation]] slot to true. */
webrtc->priv->need_negotiation = TRUE;
/* Queue a task to check connection's [[ needNegotiation]] slot and, if still
* true, fire a simple event named negotiationneeded at connection. */
gst_webrtc_bin_enqueue_task (webrtc, _check_need_negotiation_task, NULL,
NULL);
}
static GstCaps *
_find_codec_preferences (GstWebRTCBin * webrtc,
GstWebRTCRTPTransceiver * rtp_trans, GstPadDirection direction,
guint media_idx)
{
WebRTCTransceiver *trans = (WebRTCTransceiver *) rtp_trans;
GstCaps *ret = NULL;
GST_LOG_OBJECT (webrtc, "retrieving codec preferences from %" GST_PTR_FORMAT,
trans);
if (rtp_trans && rtp_trans->codec_preferences) {
GST_LOG_OBJECT (webrtc, "Using codec preferences: %" GST_PTR_FORMAT,
rtp_trans->codec_preferences);
ret = gst_caps_ref (rtp_trans->codec_preferences);
} else {
GstWebRTCBinPad *pad = NULL;
/* try to find a pad */
if (!trans
|| !(pad = _find_pad_for_transceiver (webrtc, direction, rtp_trans)))
pad = _find_pad_for_mline (webrtc, direction, media_idx);
if (!pad) {
if (trans && trans->last_configured_caps)
ret = gst_caps_ref (trans->last_configured_caps);
} else {
GstCaps *caps = NULL;
if (pad->received_caps) {
caps = gst_caps_ref (pad->received_caps);
} else if ((caps = gst_pad_get_current_caps (GST_PAD (pad)))) {
GST_LOG_OBJECT (webrtc, "Using current pad caps: %" GST_PTR_FORMAT,
caps);
} else {
if ((caps = gst_pad_peer_query_caps (GST_PAD (pad), NULL)))
GST_LOG_OBJECT (webrtc, "Using peer query caps: %" GST_PTR_FORMAT,
caps);
}
if (caps) {
if (trans)
gst_caps_replace (&trans->last_configured_caps, caps);
ret = caps;
}
gst_object_unref (pad);
}
}
if (!ret)
GST_DEBUG_OBJECT (trans, "Could not find caps for mline %u", media_idx);
return ret;
}
static GstCaps *
_add_supported_attributes_to_caps (GstWebRTCBin * webrtc,
WebRTCTransceiver * trans, const GstCaps * caps)
{
GstCaps *ret;
guint i;
ret = gst_caps_make_writable (caps);
for (i = 0; i < gst_caps_get_size (ret); i++) {
GstStructure *s = gst_caps_get_structure (ret, i);
if (trans->do_nack)
if (!gst_structure_has_field (s, "rtcp-fb-nack"))
gst_structure_set (s, "rtcp-fb-nack", G_TYPE_BOOLEAN, TRUE, NULL);
if (!gst_structure_has_field (s, "rtcp-fb-nack-pli"))
gst_structure_set (s, "rtcp-fb-nack-pli", G_TYPE_BOOLEAN, TRUE, NULL);
/* FIXME: is this needed? */
/*if (!gst_structure_has_field (s, "rtcp-fb-transport-cc"))
gst_structure_set (s, "rtcp-fb-nack-pli", G_TYPE_BOOLEAN, TRUE, NULL); */
/* FIXME: codec-specific parameters? */
}
return ret;
}
static void
_on_ice_transport_notify_state (GstWebRTCICETransport * transport,
GParamSpec * pspec, GstWebRTCBin * webrtc)
{
_update_ice_connection_state (webrtc);
_update_peer_connection_state (webrtc);
}
static void
_on_ice_transport_notify_gathering_state (GstWebRTCICETransport * transport,
GParamSpec * pspec, GstWebRTCBin * webrtc)
{
_update_ice_gathering_state (webrtc);
}
static void
_on_dtls_transport_notify_state (GstWebRTCDTLSTransport * transport,
GParamSpec * pspec, GstWebRTCBin * webrtc)
{
_update_peer_connection_state (webrtc);
}
static WebRTCTransceiver *
_create_webrtc_transceiver (GstWebRTCBin * webrtc,
GstWebRTCRTPTransceiverDirection direction, guint mline)
{
WebRTCTransceiver *trans;
GstWebRTCRTPTransceiver *rtp_trans;
GstWebRTCRTPSender *sender;
GstWebRTCRTPReceiver *receiver;
sender = gst_webrtc_rtp_sender_new ();
receiver = gst_webrtc_rtp_receiver_new ();
trans = webrtc_transceiver_new (webrtc, sender, receiver);
rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans);
rtp_trans->direction = direction;
rtp_trans->mline = mline;
/* FIXME: We don't support stopping transceiver yet so they're always not stopped */
rtp_trans->stopped = FALSE;
g_ptr_array_add (webrtc->priv->transceivers, trans);
gst_object_unref (sender);
gst_object_unref (receiver);
g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_NEW_TRANSCEIVER_SIGNAL],
0, trans);
return trans;
}
static TransportStream *
_create_transport_channel (GstWebRTCBin * webrtc, guint session_id)
{
GstWebRTCDTLSTransport *transport;
TransportStream *ret;
/* FIXME: how to parametrize the sender and the receiver */
ret = transport_stream_new (webrtc, session_id);
transport = ret->transport;
g_signal_connect (G_OBJECT (transport->transport), "notify::state",
G_CALLBACK (_on_ice_transport_notify_state), webrtc);
g_signal_connect (G_OBJECT (transport->transport),
"notify::gathering-state",
G_CALLBACK (_on_ice_transport_notify_gathering_state), webrtc);
g_signal_connect (G_OBJECT (transport), "notify::state",
G_CALLBACK (_on_dtls_transport_notify_state), webrtc);
if ((transport = ret->rtcp_transport)) {
g_signal_connect (G_OBJECT (transport->transport),
"notify::state", G_CALLBACK (_on_ice_transport_notify_state), webrtc);
g_signal_connect (G_OBJECT (transport->transport),
"notify::gathering-state",
G_CALLBACK (_on_ice_transport_notify_gathering_state), webrtc);
g_signal_connect (G_OBJECT (transport), "notify::state",
G_CALLBACK (_on_dtls_transport_notify_state), webrtc);
}
GST_TRACE_OBJECT (webrtc,
"Create transport %" GST_PTR_FORMAT " for session %u", ret, session_id);
return ret;
}
static TransportStream *
_get_or_create_rtp_transport_channel (GstWebRTCBin * webrtc, guint session_id)
{
TransportStream *ret;
gchar *pad_name;
ret = _find_transport_for_session (webrtc, session_id);
if (!ret) {
ret = _create_transport_channel (webrtc, session_id);
gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (ret->send_bin));
gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (ret->receive_bin));
g_ptr_array_add (webrtc->priv->transports, ret);
pad_name = g_strdup_printf ("recv_rtcp_sink_%u", ret->session_id);
if (!gst_element_link_pads (GST_ELEMENT (ret->receive_bin), "rtcp_src",
GST_ELEMENT (webrtc->rtpbin), pad_name))
g_warn_if_reached ();
g_free (pad_name);
pad_name = g_strdup_printf ("send_rtcp_src_%u", ret->session_id);
if (!gst_element_link_pads (GST_ELEMENT (webrtc->rtpbin), pad_name,
GST_ELEMENT (ret->send_bin), "rtcp_sink"))
g_warn_if_reached ();
g_free (pad_name);
}
gst_element_sync_state_with_parent (GST_ELEMENT (ret->send_bin));
gst_element_sync_state_with_parent (GST_ELEMENT (ret->receive_bin));
return ret;
}
/* this is called from the webrtc thread with the pc lock held */
static void
_on_data_channel_ready_state (GstWebRTCDataChannel * channel,
GParamSpec * pspec, GstWebRTCBin * webrtc)
{
GstWebRTCDataChannelState ready_state;
guint i;
g_object_get (channel, "ready-state", &ready_state, NULL);
if (ready_state == GST_WEBRTC_DATA_CHANNEL_STATE_OPEN) {
gboolean found = FALSE;
for (i = 0; i < webrtc->priv->pending_data_channels->len; i++) {
GstWebRTCDataChannel *c;
c = g_ptr_array_index (webrtc->priv->pending_data_channels, i);
if (c == channel) {
found = TRUE;
g_ptr_array_remove_index (webrtc->priv->pending_data_channels, i);
break;
}
}
if (found == FALSE) {
GST_FIXME_OBJECT (webrtc, "Received open for unknown data channel");
return;
}
g_ptr_array_add (webrtc->priv->data_channels, channel);
g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_DATA_CHANNEL_SIGNAL], 0,
gst_object_ref (channel));
}
}
static void
_on_sctpdec_pad_added (GstElement * sctpdec, GstPad * pad,
GstWebRTCBin * webrtc)
{
GstWebRTCDataChannel *channel;
guint stream_id;
GstPad *sink_pad;
if (sscanf (GST_PAD_NAME (pad), "src_%u", &stream_id) != 1)
return;
PC_LOCK (webrtc);
channel = _find_data_channel_for_id (webrtc, stream_id);
if (!channel) {
channel = g_object_new (GST_TYPE_WEBRTC_DATA_CHANNEL, NULL);
channel->id = stream_id;
channel->webrtcbin = webrtc;
gst_bin_add (GST_BIN (webrtc), channel->appsrc);
gst_bin_add (GST_BIN (webrtc), channel->appsink);
gst_element_sync_state_with_parent (channel->appsrc);
gst_element_sync_state_with_parent (channel->appsink);
gst_webrtc_data_channel_link_to_sctp (channel,
webrtc->priv->sctp_transport);
g_ptr_array_add (webrtc->priv->pending_data_channels, channel);
}
g_signal_connect (channel, "notify::ready-state",
G_CALLBACK (_on_data_channel_ready_state), webrtc);
sink_pad = gst_element_get_static_pad (channel->appsink, "sink");
if (gst_pad_link (pad, sink_pad) != GST_PAD_LINK_OK)
GST_WARNING_OBJECT (channel, "Failed to link sctp pad %s with channel %"
GST_PTR_FORMAT, GST_PAD_NAME (pad), channel);
gst_object_unref (sink_pad);
PC_UNLOCK (webrtc);
}
static void
_on_sctp_state_notify (GstWebRTCSCTPTransport * sctp, GParamSpec * pspec,
GstWebRTCBin * webrtc)
{
GstWebRTCSCTPTransportState state;
g_object_get (sctp, "state", &state, NULL);
if (state == GST_WEBRTC_SCTP_TRANSPORT_STATE_CONNECTED) {
int i;
PC_LOCK (webrtc);
GST_DEBUG_OBJECT (webrtc, "SCTP association established");
for (i = 0; i < webrtc->priv->data_channels->len; i++) {
GstWebRTCDataChannel *channel;
channel = g_ptr_array_index (webrtc->priv->data_channels, i);
gst_webrtc_data_channel_link_to_sctp (channel,
webrtc->priv->sctp_transport);
if (!channel->negotiated && !channel->opened)
gst_webrtc_data_channel_start_negotiation (channel);
}
PC_UNLOCK (webrtc);
}
}
/* Forward declaration so we can easily disconnect the signal handler */
static void _on_sctp_notify_dtls_state (GstWebRTCDTLSTransport * transport,
GParamSpec * pspec, GstWebRTCBin * webrtc);
static void
_sctp_check_dtls_state_task (GstWebRTCBin * webrtc, gpointer unused)
{
TransportStream *stream;
GstWebRTCDTLSTransport *transport;
GstWebRTCDTLSTransportState dtls_state;
GstWebRTCSCTPTransport *sctp_transport;
stream = webrtc->priv->data_channel_transport;
transport = stream->transport;
g_object_get (transport, "state", &dtls_state, NULL);
/* Not connected yet so just return */
if (dtls_state != GST_WEBRTC_DTLS_TRANSPORT_STATE_CONNECTED) {
GST_DEBUG_OBJECT (webrtc,
"Data channel DTLS connection is not ready yet: %d", dtls_state);
return;
}
GST_DEBUG_OBJECT (webrtc, "Data channel DTLS connection is now ready");
sctp_transport = webrtc->priv->sctp_transport;
/* Not locked state anymore so this was already taken care of before */
if (!gst_element_is_locked_state (sctp_transport->sctpdec))
return;
/* Start up the SCTP elements now that the DTLS connection is established */
gst_element_set_locked_state (sctp_transport->sctpdec, FALSE);
gst_element_set_locked_state (sctp_transport->sctpenc, FALSE);
gst_element_sync_state_with_parent (GST_ELEMENT (sctp_transport->sctpdec));
gst_element_sync_state_with_parent (GST_ELEMENT (sctp_transport->sctpenc));
if (sctp_transport->sctpdec_block_id) {
GstPad *receive_srcpad;
receive_srcpad =
gst_element_get_static_pad (GST_ELEMENT (stream->receive_bin),
"data_src");
gst_pad_remove_probe (receive_srcpad, sctp_transport->sctpdec_block_id);
sctp_transport->sctpdec_block_id = 0;
gst_object_unref (receive_srcpad);
}
g_signal_handlers_disconnect_by_func (transport, _on_sctp_notify_dtls_state,
webrtc);
}
static void
_on_sctp_notify_dtls_state (GstWebRTCDTLSTransport * transport,
GParamSpec * pspec, GstWebRTCBin * webrtc)
{
GstWebRTCDTLSTransportState dtls_state;
g_object_get (transport, "state", &dtls_state, NULL);
GST_TRACE_OBJECT (webrtc, "Data channel DTLS state changed to %d",
dtls_state);
/* Connected now, so schedule a task to update the state of the SCTP
* elements */
if (dtls_state == GST_WEBRTC_DTLS_TRANSPORT_STATE_CONNECTED) {
gst_webrtc_bin_enqueue_task (webrtc,
(GstWebRTCBinFunc) _sctp_check_dtls_state_task, NULL, NULL);
}
}
static GstPadProbeReturn
sctp_pad_block (GstPad * pad, GstPadProbeInfo * info, gpointer unused)
{
/* Drop all events: we don't care about them and don't want to block on
* them. Sticky events would be forwarded again later once we unblock
* and we don't want to forward them here already because that might
* cause a spurious GST_FLOW_FLUSHING */
if (GST_IS_EVENT (info->data))
return GST_PAD_PROBE_DROP;
/* But block on any actual data-flow so we don't accidentally send that
* to a pad that is not ready yet, causing GST_FLOW_FLUSHING and everything
* to silently stop.
*/
GST_LOG_OBJECT (pad, "blocking pad with data %" GST_PTR_FORMAT, info->data);
return GST_PAD_PROBE_OK;
}
static TransportStream *
_get_or_create_data_channel_transports (GstWebRTCBin * webrtc, guint session_id)
{
if (!webrtc->priv->data_channel_transport) {
TransportStream *stream;
GstWebRTCSCTPTransport *sctp_transport;
int i;
stream = _find_transport_for_session (webrtc, session_id);
if (!stream) {
stream = _create_transport_channel (webrtc, session_id);
gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (stream->send_bin));
gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (stream->receive_bin));
g_ptr_array_add (webrtc->priv->transports, stream);
}
webrtc->priv->data_channel_transport = stream;
g_object_set (stream, "rtcp-mux", TRUE, NULL);
if (!(sctp_transport = webrtc->priv->sctp_transport)) {
sctp_transport = gst_webrtc_sctp_transport_new ();
sctp_transport->transport =
g_object_ref (webrtc->priv->data_channel_transport->transport);
sctp_transport->webrtcbin = webrtc;
/* Don't automatically start SCTP elements as part of webrtcbin. We
* need to delay this until the DTLS transport is fully connected! */
gst_element_set_locked_state (sctp_transport->sctpdec, TRUE);
gst_element_set_locked_state (sctp_transport->sctpenc, TRUE);
gst_bin_add (GST_BIN (webrtc), sctp_transport->sctpdec);
gst_bin_add (GST_BIN (webrtc), sctp_transport->sctpenc);
}
g_signal_connect (sctp_transport->sctpdec, "pad-added",
G_CALLBACK (_on_sctpdec_pad_added), webrtc);
g_signal_connect (sctp_transport, "notify::state",
G_CALLBACK (_on_sctp_state_notify), webrtc);
if (sctp_transport->sctpdec_block_id == 0) {
GstPad *receive_srcpad;
receive_srcpad =
gst_element_get_static_pad (GST_ELEMENT (stream->receive_bin),
"data_src");
sctp_transport->sctpdec_block_id =
gst_pad_add_probe (receive_srcpad,
GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM,
(GstPadProbeCallback) sctp_pad_block, NULL, NULL);
gst_object_unref (receive_srcpad);
}
if (!gst_element_link_pads (GST_ELEMENT (stream->receive_bin), "data_src",
GST_ELEMENT (sctp_transport->sctpdec), "sink"))
g_warn_if_reached ();
if (!gst_element_link_pads (GST_ELEMENT (sctp_transport->sctpenc), "src",
GST_ELEMENT (stream->send_bin), "data_sink"))
g_warn_if_reached ();
for (i = 0; i < webrtc->priv->data_channels->len; i++) {
GstWebRTCDataChannel *channel;
channel = g_ptr_array_index (webrtc->priv->data_channels, i);
gst_webrtc_data_channel_link_to_sctp (channel,
webrtc->priv->sctp_transport);
}
gst_element_sync_state_with_parent (GST_ELEMENT (stream->send_bin));
gst_element_sync_state_with_parent (GST_ELEMENT (stream->receive_bin));
if (!webrtc->priv->sctp_transport) {
/* Connect to the notify::state signal to get notified when the DTLS
* connection is established. Only then can we start the SCTP elements */
g_signal_connect (stream->transport, "notify::state",
G_CALLBACK (_on_sctp_notify_dtls_state), webrtc);
/* As this would be racy otherwise, also schedule a task that checks the
* current state of the connection already without getting the signal
* called */
gst_webrtc_bin_enqueue_task (webrtc,
(GstWebRTCBinFunc) _sctp_check_dtls_state_task, NULL, NULL);
}
webrtc->priv->sctp_transport = sctp_transport;
}
return webrtc->priv->data_channel_transport;
}
static TransportStream *
_get_or_create_transport_stream (GstWebRTCBin * webrtc, guint session_id,
gboolean is_datachannel)
{
if (is_datachannel)
return _get_or_create_data_channel_transports (webrtc, session_id);
else
return _get_or_create_rtp_transport_channel (webrtc, session_id);
}
static guint
g_array_find_uint (GArray * array, guint val)
{
guint i;
for (i = 0; i < array->len; i++) {
if (g_array_index (array, guint, i) == val)
return i;
}
return G_MAXUINT;
}
static gboolean
_pick_available_pt (GArray * reserved_pts, guint * i)
{
gboolean ret = FALSE;
for (*i = 96; *i <= 127; (*i)++) {
if (g_array_find_uint (reserved_pts, *i) == G_MAXUINT) {
g_array_append_val (reserved_pts, *i);
ret = TRUE;
break;
}
}
return ret;
}
static gboolean
_pick_fec_payload_types (GstWebRTCBin * webrtc, WebRTCTransceiver * trans,
GArray * reserved_pts, gint clockrate, gint * rtx_target_pt,
GstSDPMedia * media)
{
gboolean ret = TRUE;
if (trans->fec_type == GST_WEBRTC_FEC_TYPE_NONE)
goto done;
if (trans->fec_type == GST_WEBRTC_FEC_TYPE_ULP_RED && clockrate != -1) {
guint pt;
gchar *str;
if (!(ret = _pick_available_pt (reserved_pts, &pt)))
goto done;
/* https://tools.ietf.org/html/rfc5109#section-14.1 */
str = g_strdup_printf ("%u", pt);
gst_sdp_media_add_format (media, str);
g_free (str);
str = g_strdup_printf ("%u red/%d", pt, clockrate);
gst_sdp_media_add_attribute (media, "rtpmap", str);
g_free (str);
*rtx_target_pt = pt;
if (!(ret = _pick_available_pt (reserved_pts, &pt)))
goto done;
str = g_strdup_printf ("%u", pt);
gst_sdp_media_add_format (media, str);
g_free (str);
str = g_strdup_printf ("%u ulpfec/%d", pt, clockrate);
gst_sdp_media_add_attribute (media, "rtpmap", str);
g_free (str);
}
done:
return ret;
}
static gboolean
_pick_rtx_payload_types (GstWebRTCBin * webrtc, WebRTCTransceiver * trans,
GArray * reserved_pts, gint clockrate, gint target_pt, guint target_ssrc,
GstSDPMedia * media)
{
gboolean ret = TRUE;
if (trans->local_rtx_ssrc_map)
gst_structure_free (trans->local_rtx_ssrc_map);
trans->local_rtx_ssrc_map =
gst_structure_new_empty ("application/x-rtp-ssrc-map");
if (trans->do_nack) {
guint pt;
gchar *str;
if (!(ret = _pick_available_pt (reserved_pts, &pt)))
goto done;
/* https://tools.ietf.org/html/rfc4588#section-8.6 */
str = g_strdup_printf ("%u", target_ssrc);
gst_structure_set (trans->local_rtx_ssrc_map, str, G_TYPE_UINT,
g_random_int (), NULL);
g_free (str);
str = g_strdup_printf ("%u", pt);
gst_sdp_media_add_format (media, str);
g_free (str);
str = g_strdup_printf ("%u rtx/%d", pt, clockrate);
gst_sdp_media_add_attribute (media, "rtpmap", str);
g_free (str);
str = g_strdup_printf ("%u apt=%d", pt, target_pt);
gst_sdp_media_add_attribute (media, "fmtp", str);
g_free (str);
}
done:
return ret;
}
/* https://tools.ietf.org/html/rfc5576#section-4.2 */
static gboolean
_media_add_rtx_ssrc_group (GQuark field_id, const GValue * value,
GstSDPMedia * media)
{
gchar *str;
str =
g_strdup_printf ("FID %s %u", g_quark_to_string (field_id),
g_value_get_uint (value));
gst_sdp_media_add_attribute (media, "ssrc-group", str);
g_free (str);
return TRUE;
}
typedef struct
{
GstSDPMedia *media;
GstWebRTCBin *webrtc;
WebRTCTransceiver *trans;
} RtxSsrcData;
static gboolean
_media_add_rtx_ssrc (GQuark field_id, const GValue * value, RtxSsrcData * data)
{
gchar *str;
GstStructure *sdes;
const gchar *cname;
g_object_get (data->webrtc->rtpbin, "sdes", &sdes, NULL);
/* http://www.freesoft.org/CIE/RFC/1889/24.htm */
cname = gst_structure_get_string (sdes, "cname");
/* https://tools.ietf.org/html/draft-ietf-mmusic-msid-16 */
str =
g_strdup_printf ("%u msid:%s %s", g_value_get_uint (value),
cname, GST_OBJECT_NAME (data->trans));
gst_sdp_media_add_attribute (data->media, "ssrc", str);
g_free (str);
str = g_strdup_printf ("%u cname:%s", g_value_get_uint (value), cname);
gst_sdp_media_add_attribute (data->media, "ssrc", str);
g_free (str);
gst_structure_free (sdes);
return TRUE;
}
static void
_media_add_ssrcs (GstSDPMedia * media, GstCaps * caps, GstWebRTCBin * webrtc,
WebRTCTransceiver * trans)
{
guint i;
RtxSsrcData data = { media, webrtc, trans };
const gchar *cname;
GstStructure *sdes;
g_object_get (webrtc->rtpbin, "sdes", &sdes, NULL);
/* http://www.freesoft.org/CIE/RFC/1889/24.htm */
cname = gst_structure_get_string (sdes, "cname");
if (trans->local_rtx_ssrc_map)
gst_structure_foreach (trans->local_rtx_ssrc_map,
(GstStructureForeachFunc) _media_add_rtx_ssrc_group, media);
for (i = 0; i < gst_caps_get_size (caps); i++) {
const GstStructure *s = gst_caps_get_structure (caps, i);
guint ssrc;
if (gst_structure_get_uint (s, "ssrc", &ssrc)) {
gchar *str;
/* https://tools.ietf.org/html/draft-ietf-mmusic-msid-16 */
str =
g_strdup_printf ("%u msid:%s %s", ssrc, cname,
GST_OBJECT_NAME (trans));
gst_sdp_media_add_attribute (media, "ssrc", str);
g_free (str);
str = g_strdup_printf ("%u cname:%s", ssrc, cname);
gst_sdp_media_add_attribute (media, "ssrc", str);
g_free (str);
}
}
gst_structure_free (sdes);
if (trans->local_rtx_ssrc_map)
gst_structure_foreach (trans->local_rtx_ssrc_map,
(GstStructureForeachFunc) _media_add_rtx_ssrc, &data);
}
static void
_add_fingerprint_to_media (GstWebRTCDTLSTransport * transport,
GstSDPMedia * media)
{
gchar *cert, *fingerprint, *val;
g_object_get (transport, "certificate", &cert, NULL);
fingerprint =
_generate_fingerprint_from_certificate (cert, G_CHECKSUM_SHA256);
g_free (cert);
val =
g_strdup_printf ("%s %s",
_g_checksum_to_webrtc_string (G_CHECKSUM_SHA256), fingerprint);
g_free (fingerprint);
gst_sdp_media_add_attribute (media, "fingerprint", val);
g_free (val);
}
/* based off https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-18#section-5.2.1 */
static gboolean
sdp_media_from_transceiver (GstWebRTCBin * webrtc, GstSDPMedia * media,
GstWebRTCRTPTransceiver * trans, GstWebRTCSDPType type, guint media_idx,
GString * bundled_mids, guint bundle_idx, gchar * bundle_ufrag,
gchar * bundle_pwd, GArray * reserved_pts)
{
/* TODO:
* rtp header extensions
* ice attributes
* rtx
* fec
* msid-semantics
* msid
* dtls fingerprints
* multiple dtls fingerprints https://tools.ietf.org/html/draft-ietf-mmusic-4572-update-05
*/
GstSDPMessage *last_offer = _get_latest_self_generated_sdp (webrtc);
gchar *direction, *sdp_mid, *ufrag, *pwd;
gboolean bundle_only;
GstCaps *caps;
int i;
if (trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE
|| trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE)
return FALSE;
g_assert (trans->mline == -1 || trans->mline == media_idx);
bundle_only = bundled_mids && bundle_idx != media_idx
&& webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE;
/* mandated by JSEP */
gst_sdp_media_add_attribute (media, "setup", "actpass");
/* FIXME: deal with ICE restarts */
if (last_offer && trans->mline != -1 && trans->mid) {
ufrag = g_strdup (_media_get_ice_ufrag (last_offer, trans->mline));
pwd = g_strdup (_media_get_ice_pwd (last_offer, trans->mline));
GST_DEBUG_OBJECT (trans, "%u Using previous ice parameters", media_idx);
} else {
GST_DEBUG_OBJECT (trans,
"%u Generating new ice parameters mline %i, mid %s", media_idx,
trans->mline, trans->mid);
if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) {
_generate_ice_credentials (&ufrag, &pwd);
} else {
g_assert (bundle_ufrag && bundle_pwd);
ufrag = g_strdup (bundle_ufrag);
pwd = g_strdup (bundle_pwd);
}
}
gst_sdp_media_add_attribute (media, "ice-ufrag", ufrag);
gst_sdp_media_add_attribute (media, "ice-pwd", pwd);
g_free (ufrag);
g_free (pwd);
gst_sdp_media_set_port_info (media, bundle_only || trans->stopped ? 0 : 9, 0);
gst_sdp_media_set_proto (media, "UDP/TLS/RTP/SAVPF");
gst_sdp_media_add_connection (media, "IN", "IP4", "0.0.0.0", 0, 0);
if (bundle_only) {
gst_sdp_media_add_attribute (media, "bundle-only", NULL);
}
/* FIXME: negotiate this */
/* FIXME: when bundle_only, these should not be added:
* https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-52#section-7.1.3
* However, this causes incompatibilities with current versions
* of the major browsers */
gst_sdp_media_add_attribute (media, "rtcp-mux", "");
gst_sdp_media_add_attribute (media, "rtcp-rsize", NULL);
direction =
_enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION,
trans->direction);
gst_sdp_media_add_attribute (media, direction, "");
g_free (direction);
if (type == GST_WEBRTC_SDP_TYPE_OFFER) {
caps = _find_codec_preferences (webrtc, trans, GST_PAD_SINK, media_idx);
caps =
_add_supported_attributes_to_caps (webrtc, WEBRTC_TRANSCEIVER (trans),
caps);
} else {
g_assert_not_reached ();
}
if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps)) {
GST_WARNING_OBJECT (webrtc, "no caps available for transceiver, skipping");
if (caps)
gst_caps_unref (caps);
return FALSE;
}
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstCaps *format = gst_caps_new_empty ();
const GstStructure *s = gst_caps_get_structure (caps, i);
gst_caps_append_structure (format, gst_structure_copy (s));
GST_DEBUG_OBJECT (webrtc, "Adding %u-th caps %" GST_PTR_FORMAT
" to %u-th media", i, format, media_idx);
/* this only looks at the first structure so we loop over the given caps
* and add each structure inside it piecemeal */
gst_sdp_media_set_media_from_caps (format, media);
gst_caps_unref (format);
}
if (type == GST_WEBRTC_SDP_TYPE_OFFER) {
const GstStructure *s = gst_caps_get_structure (caps, 0);
gint clockrate = -1;
gint rtx_target_pt;
gint original_rtx_target_pt; /* Workaround chrome bug: https://bugs.chromium.org/p/webrtc/issues/detail?id=6196 */
guint rtx_target_ssrc = -1;
if (gst_structure_get_int (s, "payload", &rtx_target_pt) &&
webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE)
g_array_append_val (reserved_pts, rtx_target_pt);
original_rtx_target_pt = rtx_target_pt;
if (!gst_structure_get_int (s, "clock-rate", &clockrate))
GST_WARNING_OBJECT (webrtc,
"Caps %" GST_PTR_FORMAT " are missing clock-rate", caps);
if (!gst_structure_get_uint (s, "ssrc", &rtx_target_ssrc))
GST_WARNING_OBJECT (webrtc, "Caps %" GST_PTR_FORMAT " are missing ssrc",
caps);
_pick_fec_payload_types (webrtc, WEBRTC_TRANSCEIVER (trans), reserved_pts,
clockrate, &rtx_target_pt, media);
_pick_rtx_payload_types (webrtc, WEBRTC_TRANSCEIVER (trans), reserved_pts,
clockrate, rtx_target_pt, rtx_target_ssrc, media);
if (original_rtx_target_pt != rtx_target_pt)
_pick_rtx_payload_types (webrtc, WEBRTC_TRANSCEIVER (trans), reserved_pts,
clockrate, original_rtx_target_pt, rtx_target_ssrc, media);
}
_media_add_ssrcs (media, caps, webrtc, WEBRTC_TRANSCEIVER (trans));
/* Some identifier; we also add the media name to it so it's identifiable */
if (trans->mid) {
gst_sdp_media_add_attribute (media, "mid", trans->mid);
} else {
sdp_mid = g_strdup_printf ("%s%u", gst_sdp_media_get_media (media),
webrtc->priv->media_counter++);
gst_sdp_media_add_attribute (media, "mid", sdp_mid);
g_free (sdp_mid);
}
/* TODO:
* - add a=candidate lines for gathered candidates
*/
if (trans->sender) {
if (!trans->sender->transport) {
TransportStream *item;
item =
_get_or_create_transport_stream (webrtc,
bundled_mids ? bundle_idx : media_idx, FALSE);
webrtc_transceiver_set_transport (WEBRTC_TRANSCEIVER (trans), item);
}
_add_fingerprint_to_media (trans->sender->transport, media);
}
if (bundled_mids) {
const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid");
g_assert (mid);
g_string_append_printf (bundled_mids, " %s", mid);
}
gst_caps_unref (caps);
return TRUE;
}
static void
gather_pad_pt (GstWebRTCBinPad * pad, GArray * reserved_pts)
{
if (pad->received_caps) {
GstStructure *s = gst_caps_get_structure (pad->received_caps, 0);
gint pt;
if (gst_structure_get_int (s, "payload", &pt)) {
g_array_append_val (reserved_pts, pt);
}
}
}
static GArray *
gather_reserved_pts (GstWebRTCBin * webrtc)
{
GstElement *element = GST_ELEMENT (webrtc);
GArray *reserved_pts = g_array_new (FALSE, FALSE, sizeof (guint));
GST_OBJECT_LOCK (webrtc);
g_list_foreach (element->sinkpads, (GFunc) gather_pad_pt, reserved_pts);
g_list_foreach (webrtc->priv->pending_pads, (GFunc) gather_pad_pt,
reserved_pts);
GST_OBJECT_UNLOCK (webrtc);
return reserved_pts;
}
static gboolean
_add_data_channel_offer (GstWebRTCBin * webrtc, GstSDPMessage * msg,
GstSDPMedia * media, GString * bundled_mids, guint bundle_idx,
gchar * bundle_ufrag, gchar * bundle_pwd)
{
GstSDPMessage *last_offer = _get_latest_self_generated_sdp (webrtc);
gchar *ufrag, *pwd, *sdp_mid;
gboolean bundle_only = bundled_mids
&& webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE
&& gst_sdp_message_medias_len (msg) != bundle_idx;
guint last_data_index = G_MAXUINT;
/* add data channel support */
if (webrtc->priv->data_channels->len == 0)
return FALSE;
if (last_offer) {
last_data_index = _message_get_datachannel_index (last_offer);
if (last_data_index < G_MAXUINT) {
g_assert (last_data_index < gst_sdp_message_medias_len (last_offer));
/* XXX: is this always true when recycling transceivers?
* i.e. do we always put the data channel in the same mline */
g_assert (last_data_index == gst_sdp_message_medias_len (msg));
}
}
/* mandated by JSEP */
gst_sdp_media_add_attribute (media, "setup", "actpass");
/* FIXME: only needed when restarting ICE */
if (last_offer && last_data_index < G_MAXUINT) {
ufrag = g_strdup (_media_get_ice_ufrag (last_offer, last_data_index));
pwd = g_strdup (_media_get_ice_pwd (last_offer, last_data_index));
} else {
if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) {
_generate_ice_credentials (&ufrag, &pwd);
} else {
ufrag = g_strdup (bundle_ufrag);
pwd = g_strdup (bundle_pwd);
}
}
gst_sdp_media_add_attribute (media, "ice-ufrag", ufrag);
gst_sdp_media_add_attribute (media, "ice-pwd", pwd);
g_free (ufrag);
g_free (pwd);
gst_sdp_media_set_media (media, "application");
gst_sdp_media_set_port_info (media, bundle_only ? 0 : 9, 0);
gst_sdp_media_set_proto (media, "UDP/DTLS/SCTP");
gst_sdp_media_add_connection (media, "IN", "IP4", "0.0.0.0", 0, 0);
gst_sdp_media_add_format (media, "webrtc-datachannel");
if (bundle_idx != gst_sdp_message_medias_len (msg))
gst_sdp_media_add_attribute (media, "bundle-only", NULL);
if (last_offer && last_data_index < G_MAXUINT) {
const GstSDPMedia *last_data_media;
const gchar *mid;
last_data_media = gst_sdp_message_get_media (last_offer, last_data_index);
mid = gst_sdp_media_get_attribute_val (last_data_media, "mid");
gst_sdp_media_add_attribute (media, "mid", mid);
} else {
sdp_mid = g_strdup_printf ("%s%u", gst_sdp_media_get_media (media),
webrtc->priv->media_counter++);
gst_sdp_media_add_attribute (media, "mid", sdp_mid);
g_free (sdp_mid);
}
if (bundled_mids) {
const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid");
g_assert (mid);
g_string_append_printf (bundled_mids, " %s", mid);
}
/* FIXME: negotiate this properly */
gst_sdp_media_add_attribute (media, "sctp-port", "5000");
_get_or_create_data_channel_transports (webrtc,
bundled_mids ? 0 : webrtc->priv->transceivers->len);
_add_fingerprint_to_media (webrtc->priv->sctp_transport->transport, media);
return TRUE;
}
/* TODO: use the options argument */
static GstSDPMessage *
_create_offer_task (GstWebRTCBin * webrtc, const GstStructure * options)
{
GstSDPMessage *ret;
GString *bundled_mids = NULL;
gchar *bundle_ufrag = NULL;
gchar *bundle_pwd = NULL;
GArray *reserved_pts = NULL;
GstSDPMessage *last_offer = _get_latest_self_generated_sdp (webrtc);
GList *seen_transceivers = NULL;
guint media_idx = 0;
int i;
gst_sdp_message_new (&ret);
gst_sdp_message_set_version (ret, "0");
{
gchar *v, *sess_id;
v = g_strdup_printf ("%u", webrtc->priv->offer_count++);
if (last_offer) {
const GstSDPOrigin *origin = gst_sdp_message_get_origin (last_offer);
sess_id = g_strdup (origin->sess_id);
} else {
sess_id = g_strdup_printf ("%" G_GUINT64_FORMAT, RANDOM_SESSION_ID);
}
gst_sdp_message_set_origin (ret, "-", sess_id, v, "IN", "IP4", "0.0.0.0");
g_free (sess_id);
g_free (v);
}
gst_sdp_message_set_session_name (ret, "-");
gst_sdp_message_add_time (ret, "0", "0", NULL);
gst_sdp_message_add_attribute (ret, "ice-options", "trickle");
if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE) {
bundled_mids = g_string_new ("BUNDLE");
} else if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_COMPAT) {
bundled_mids = g_string_new ("BUNDLE");
}
if (webrtc->bundle_policy != GST_WEBRTC_BUNDLE_POLICY_NONE) {
GStrv last_bundle = NULL;
guint bundle_media_index;
reserved_pts = gather_reserved_pts (webrtc);
if (last_offer && _parse_bundle (last_offer, &last_bundle) && last_bundle
&& last_bundle && last_bundle[0]
&& _get_bundle_index (last_offer, last_bundle, &bundle_media_index)) {
bundle_ufrag =
g_strdup (_media_get_ice_ufrag (last_offer, bundle_media_index));
bundle_pwd =
g_strdup (_media_get_ice_pwd (last_offer, bundle_media_index));
} else {
_generate_ice_credentials (&bundle_ufrag, &bundle_pwd);
}
g_strfreev (last_bundle);
}
/* FIXME: recycle transceivers */
/* Fill up the renegotiated streams first */
if (last_offer) {
for (i = 0; i < gst_sdp_message_medias_len (last_offer); i++) {
GstWebRTCRTPTransceiver *trans = NULL;
const GstSDPMedia *last_media;
last_media = gst_sdp_message_get_media (last_offer, i);
if (g_strcmp0 (gst_sdp_media_get_media (last_media), "audio") == 0
|| g_strcmp0 (gst_sdp_media_get_media (last_media), "video") == 0) {
const gchar *last_mid;
int j;
last_mid = gst_sdp_media_get_attribute_val (last_media, "mid");
for (j = 0; j < webrtc->priv->transceivers->len; j++) {
trans = g_ptr_array_index (webrtc->priv->transceivers, j);
if (trans->mid && g_strcmp0 (trans->mid, last_mid) == 0) {
GstSDPMedia *media;
g_assert (!g_list_find (seen_transceivers, trans));
GST_LOG_OBJECT (webrtc, "using previous negotiatied transceiver %"
GST_PTR_FORMAT " with mid %s into media index %u", trans,
trans->mid, media_idx);
/* FIXME: deal with format changes */
gst_sdp_media_copy (last_media, &media);
_media_replace_direction (media, trans->direction);
if (bundled_mids) {
const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid");
g_assert (mid);
g_string_append_printf (bundled_mids, " %s", mid);
}
gst_sdp_message_add_media (ret, media);
media_idx++;
gst_sdp_media_free (media);
seen_transceivers = g_list_prepend (seen_transceivers, trans);
break;
}
}
} else if (g_strcmp0 (gst_sdp_media_get_media (last_media),
"application") == 0) {
GstSDPMedia media = { 0, };
gst_sdp_media_init (&media);
if (_add_data_channel_offer (webrtc, ret, &media, bundled_mids, 0,
bundle_ufrag, bundle_pwd)) {
gst_sdp_message_add_media (ret, &media);
media_idx++;
} else {
gst_sdp_media_uninit (&media);
}
}
}
}
/* add any extra streams */
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *trans;
GstSDPMedia media = { 0, };
trans = g_ptr_array_index (webrtc->priv->transceivers, i);
/* don't add transceivers twice */
if (g_list_find (seen_transceivers, trans))
continue;
/* don't add stopped transceivers */
if (trans->stopped)
continue;
gst_sdp_media_init (&media);
if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) {
reserved_pts = g_array_new (FALSE, FALSE, sizeof (guint));
}
GST_LOG_OBJECT (webrtc, "adding transceiver %" GST_PTR_FORMAT " at media "
"index %u", trans, media_idx);
if (sdp_media_from_transceiver (webrtc, &media, trans,
GST_WEBRTC_SDP_TYPE_OFFER, media_idx, bundled_mids, 0, bundle_ufrag,
bundle_pwd, reserved_pts)) {
gst_sdp_message_add_media (ret, &media);
media_idx++;
} else {
gst_sdp_media_uninit (&media);
}
if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) {
g_array_free (reserved_pts, TRUE);
}
seen_transceivers = g_list_prepend (seen_transceivers, trans);
}
if (webrtc->bundle_policy != GST_WEBRTC_BUNDLE_POLICY_NONE) {
g_array_free (reserved_pts, TRUE);
}
/* add a data channel if exists and not renegotiated */
if (_message_get_datachannel_index (ret) == G_MAXUINT) {
GstSDPMedia media = { 0, };
gst_sdp_media_init (&media);
if (_add_data_channel_offer (webrtc, ret, &media, bundled_mids, 0,
bundle_ufrag, bundle_pwd)) {
gst_sdp_message_add_media (ret, &media);
media_idx++;
} else {
gst_sdp_media_uninit (&media);
}
}
g_assert (media_idx == gst_sdp_message_medias_len (ret));
if (bundled_mids) {
gchar *mids = g_string_free (bundled_mids, FALSE);
gst_sdp_message_add_attribute (ret, "group", mids);
g_free (mids);
}
if (bundle_ufrag)
g_free (bundle_ufrag);
if (bundle_pwd)
g_free (bundle_pwd);
/* FIXME: pre-emptively setup receiving elements when needed */
/* XXX: only true for the initial offerer */
g_object_set (webrtc->priv->ice, "controller", TRUE, NULL);
g_list_free (seen_transceivers);
if (webrtc->priv->last_generated_answer)
gst_webrtc_session_description_free (webrtc->priv->last_generated_answer);
webrtc->priv->last_generated_answer = NULL;
if (webrtc->priv->last_generated_offer)
gst_webrtc_session_description_free (webrtc->priv->last_generated_offer);
{
GstSDPMessage *copy;
gst_sdp_message_copy (ret, &copy);
webrtc->priv->last_generated_offer =
gst_webrtc_session_description_new (GST_WEBRTC_SDP_TYPE_OFFER, copy);
}
return ret;
}
static void
_media_add_fec (GstSDPMedia * media, WebRTCTransceiver * trans, GstCaps * caps,
gint * rtx_target_pt)
{
guint i;
if (trans->fec_type == GST_WEBRTC_FEC_TYPE_NONE)
return;
for (i = 0; i < gst_caps_get_size (caps); i++) {
const GstStructure *s = gst_caps_get_structure (caps, i);
if (gst_structure_has_name (s, "application/x-rtp")) {
const gchar *encoding_name =
gst_structure_get_string (s, "encoding-name");
gint clock_rate;
gint pt;
if (gst_structure_get_int (s, "clock-rate", &clock_rate) &&
gst_structure_get_int (s, "payload", &pt)) {
if (!g_strcmp0 (encoding_name, "RED")) {
gchar *str;
str = g_strdup_printf ("%u", pt);
gst_sdp_media_add_format (media, str);
g_free (str);
str = g_strdup_printf ("%u red/%d", pt, clock_rate);
*rtx_target_pt = pt;
gst_sdp_media_add_attribute (media, "rtpmap", str);
g_free (str);
} else if (!g_strcmp0 (encoding_name, "ULPFEC")) {
gchar *str;
str = g_strdup_printf ("%u", pt);
gst_sdp_media_add_format (media, str);
g_free (str);
str = g_strdup_printf ("%u ulpfec/%d", pt, clock_rate);
gst_sdp_media_add_attribute (media, "rtpmap", str);
g_free (str);
}
}
}
}
}
static void
_media_add_rtx (GstSDPMedia * media, WebRTCTransceiver * trans,
GstCaps * offer_caps, gint target_pt, guint target_ssrc)
{
guint i;
const GstStructure *s;
if (trans->local_rtx_ssrc_map)
gst_structure_free (trans->local_rtx_ssrc_map);
trans->local_rtx_ssrc_map =
gst_structure_new_empty ("application/x-rtp-ssrc-map");
for (i = 0; i < gst_caps_get_size (offer_caps); i++) {
s = gst_caps_get_structure (offer_caps, i);
if (gst_structure_has_name (s, "application/x-rtp")) {
const gchar *encoding_name =
gst_structure_get_string (s, "encoding-name");
const gchar *apt_str = gst_structure_get_string (s, "apt");
gint apt;
gint clock_rate;
gint pt;
if (!apt_str)
continue;
apt = atoi (apt_str);
if (gst_structure_get_int (s, "clock-rate", &clock_rate) &&
gst_structure_get_int (s, "payload", &pt) && apt == target_pt) {
if (!g_strcmp0 (encoding_name, "RTX")) {
gchar *str;
str = g_strdup_printf ("%u", pt);
gst_sdp_media_add_format (media, str);
g_free (str);
str = g_strdup_printf ("%u rtx/%d", pt, clock_rate);
gst_sdp_media_add_attribute (media, "rtpmap", str);
g_free (str);
str = g_strdup_printf ("%d apt=%d", pt, apt);
gst_sdp_media_add_attribute (media, "fmtp", str);
g_free (str);
str = g_strdup_printf ("%u", target_ssrc);
gst_structure_set (trans->local_rtx_ssrc_map, str, G_TYPE_UINT,
g_random_int (), NULL);
}
}
}
}
}
static void
_get_rtx_target_pt_and_ssrc_from_caps (GstCaps * answer_caps, gint * target_pt,
guint * target_ssrc)
{
const GstStructure *s = gst_caps_get_structure (answer_caps, 0);
gst_structure_get_int (s, "payload", target_pt);
gst_structure_get_uint (s, "ssrc", target_ssrc);
}
/* TODO: use the options argument */
static GstSDPMessage *
_create_answer_task (GstWebRTCBin * webrtc, const GstStructure * options)
{
GstSDPMessage *ret = NULL;
const GstWebRTCSessionDescription *pending_remote =
webrtc->pending_remote_description;
guint i;
GStrv bundled = NULL;
guint bundle_idx = 0;
GString *bundled_mids = NULL;
gchar *bundle_ufrag = NULL;
gchar *bundle_pwd = NULL;
GList *seen_transceivers = NULL;
GstSDPMessage *last_answer = _get_latest_self_generated_sdp (webrtc);
if (!webrtc->pending_remote_description) {
GST_ERROR_OBJECT (webrtc,
"Asked to create an answer without a remote description");
return NULL;
}
if (!_parse_bundle (pending_remote->sdp, &bundled))
goto out;
if (bundled) {
GStrv last_bundle = NULL;
guint bundle_media_index;
if (!_get_bundle_index (pending_remote->sdp, bundled, &bundle_idx)) {
GST_ERROR_OBJECT (webrtc, "Bundle tag is %s but no media found matching",
bundled[0]);
goto out;
}
if (webrtc->bundle_policy != GST_WEBRTC_BUNDLE_POLICY_NONE) {
bundled_mids = g_string_new ("BUNDLE");
}
if (last_answer && _parse_bundle (last_answer, &last_bundle)
&& last_bundle && last_bundle[0]
&& _get_bundle_index (last_answer, last_bundle, &bundle_media_index)) {
bundle_ufrag =
g_strdup (_media_get_ice_ufrag (last_answer, bundle_media_index));
bundle_pwd =
g_strdup (_media_get_ice_pwd (last_answer, bundle_media_index));
} else {
_generate_ice_credentials (&bundle_ufrag, &bundle_pwd);
}
g_strfreev (last_bundle);
}
gst_sdp_message_new (&ret);
gst_sdp_message_set_version (ret, "0");
{
const GstSDPOrigin *offer_origin =
gst_sdp_message_get_origin (pending_remote->sdp);
gst_sdp_message_set_origin (ret, "-", offer_origin->sess_id,
offer_origin->sess_version, "IN", "IP4", "0.0.0.0");
}
gst_sdp_message_set_session_name (ret, "-");
for (i = 0; i < gst_sdp_message_attributes_len (pending_remote->sdp); i++) {
const GstSDPAttribute *attr =
gst_sdp_message_get_attribute (pending_remote->sdp, i);
if (g_strcmp0 (attr->key, "ice-options") == 0) {
gst_sdp_message_add_attribute (ret, attr->key, attr->value);
}
}
for (i = 0; i < gst_sdp_message_medias_len (pending_remote->sdp); i++) {
GstSDPMedia *media = NULL;
GstSDPMedia *offer_media;
GstWebRTCDTLSSetup offer_setup, answer_setup;
guint j, k;
gboolean bundle_only;
const gchar *mid;
offer_media =
(GstSDPMedia *) gst_sdp_message_get_media (pending_remote->sdp, i);
bundle_only = _media_has_attribute_key (offer_media, "bundle-only");
gst_sdp_media_new (&media);
if (bundle_only && webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE)
gst_sdp_media_set_port_info (media, 0, 0);
else
gst_sdp_media_set_port_info (media, 9, 0);
gst_sdp_media_add_connection (media, "IN", "IP4", "0.0.0.0", 0, 0);
{
gchar *ufrag, *pwd;
/* FIXME: deal with ICE restarts */
if (last_answer && i < gst_sdp_message_medias_len (last_answer)) {
ufrag = g_strdup (_media_get_ice_ufrag (last_answer, i));
pwd = g_strdup (_media_get_ice_pwd (last_answer, i));
} else {
if (!bundled) {
_generate_ice_credentials (&ufrag, &pwd);
} else {
ufrag = g_strdup (bundle_ufrag);
pwd = g_strdup (bundle_pwd);
}
}
gst_sdp_media_add_attribute (media, "ice-ufrag", ufrag);
gst_sdp_media_add_attribute (media, "ice-pwd", pwd);
g_free (ufrag);
g_free (pwd);
}
for (j = 0; j < gst_sdp_media_attributes_len (offer_media); j++) {
const GstSDPAttribute *attr =
gst_sdp_media_get_attribute (offer_media, j);
if (g_strcmp0 (attr->key, "mid") == 0
|| g_strcmp0 (attr->key, "rtcp-mux") == 0) {
gst_sdp_media_add_attribute (media, attr->key, attr->value);
/* FIXME: handle anything we want to keep */
}
}
mid = gst_sdp_media_get_attribute_val (media, "mid");
/* XXX: not strictly required but a lot of functionality requires a mid */
g_assert (mid);
/* set the a=setup: attribute */
offer_setup = _get_dtls_setup_from_media (offer_media);
answer_setup = _intersect_dtls_setup (offer_setup);
if (answer_setup == GST_WEBRTC_DTLS_SETUP_NONE) {
GST_WARNING_OBJECT (webrtc, "Could not intersect offer setup with "
"transceiver direction");
goto rejected;
}
_media_replace_setup (media, answer_setup);
if (g_strcmp0 (gst_sdp_media_get_media (offer_media), "application") == 0) {
int sctp_port;
if (gst_sdp_media_formats_len (offer_media) != 1) {
GST_WARNING_OBJECT (webrtc, "Could not find a format in the m= line "
"for webrtc-datachannel");
goto rejected;
}
sctp_port = _get_sctp_port_from_media (offer_media);
if (sctp_port == -1) {
GST_WARNING_OBJECT (webrtc, "media does not contain a sctp port");
goto rejected;
}
/* XXX: older browsers will produce a different SDP format for data
* channel that is currently not parsed correctly */
gst_sdp_media_set_proto (media, "UDP/DTLS/SCTP");
gst_sdp_media_set_media (media, "application");
gst_sdp_media_set_port_info (media, 9, 0);
gst_sdp_media_add_format (media, "webrtc-datachannel");
/* FIXME: negotiate this properly on renegotiation */
gst_sdp_media_add_attribute (media, "sctp-port", "5000");
_get_or_create_data_channel_transports (webrtc,
bundled_mids ? bundle_idx : i);
if (bundled_mids) {
g_assert (mid);
g_string_append_printf (bundled_mids, " %s", mid);
}
_add_fingerprint_to_media (webrtc->priv->sctp_transport->transport,
media);
} else if (g_strcmp0 (gst_sdp_media_get_media (offer_media), "audio") == 0
|| g_strcmp0 (gst_sdp_media_get_media (offer_media), "video") == 0) {
GstCaps *offer_caps, *answer_caps = NULL;
GstWebRTCRTPTransceiver *rtp_trans = NULL;
WebRTCTransceiver *trans = NULL;
GstWebRTCRTPTransceiverDirection offer_dir, answer_dir;
gint target_pt = -1;
gint original_target_pt = -1;
guint target_ssrc = 0;
gst_sdp_media_set_proto (media, "UDP/TLS/RTP/SAVPF");
offer_caps = _rtp_caps_from_media (offer_media);
if (last_answer && i < gst_sdp_message_medias_len (last_answer)
&& (rtp_trans =
_find_transceiver (webrtc, mid,
(FindTransceiverFunc) match_for_mid))) {
const GstSDPMedia *last_media =
gst_sdp_message_get_media (last_answer, i);
const gchar *last_mid =
gst_sdp_media_get_attribute_val (last_media, "mid");
/* FIXME: assumes no shenanigans with recycling transceivers */
g_assert (g_strcmp0 (mid, last_mid) == 0);
if (!answer_caps
&& (rtp_trans->direction ==
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV
|| rtp_trans->direction ==
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY))
answer_caps =
_find_codec_preferences (webrtc, rtp_trans, GST_PAD_SINK, i);
if (!answer_caps
&& (rtp_trans->direction ==
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV
|| rtp_trans->direction ==
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY))
answer_caps =
_find_codec_preferences (webrtc, rtp_trans, GST_PAD_SRC, i);
if (!answer_caps)
answer_caps = _rtp_caps_from_media (last_media);
/* XXX: In theory we're meant to use the sendrecv formats for the
* inactive direction however we don't know what that may be and would
* require asking outside what it expects to possibly send later */
GST_LOG_OBJECT (webrtc, "Found existing previously negotiated "
"transceiver %" GST_PTR_FORMAT " from mid %s for mline %u "
"using caps %" GST_PTR_FORMAT, rtp_trans, mid, i, answer_caps);
} else {
for (j = 0; j < webrtc->priv->transceivers->len; j++) {
GstCaps *trans_caps;
rtp_trans = g_ptr_array_index (webrtc->priv->transceivers, j);
if (g_list_find (seen_transceivers, rtp_trans)) {
/* Don't double allocate a transceiver to multiple mlines */
rtp_trans = NULL;
continue;
}
trans_caps =
_find_codec_preferences (webrtc, rtp_trans, GST_PAD_SINK, j);
GST_TRACE_OBJECT (webrtc, "trying to compare %" GST_PTR_FORMAT
" and %" GST_PTR_FORMAT, offer_caps, trans_caps);
/* FIXME: technically this is a little overreaching as some fields we
* we can deal with not having and/or we may have unrecognized fields
* that we cannot actually support */
if (trans_caps) {
answer_caps = gst_caps_intersect (offer_caps, trans_caps);
if (answer_caps && !gst_caps_is_empty (answer_caps)) {
GST_LOG_OBJECT (webrtc,
"found compatible transceiver %" GST_PTR_FORMAT
" for offer media %u", rtp_trans, i);
if (trans_caps)
gst_caps_unref (trans_caps);
break;
} else {
if (answer_caps) {
gst_caps_unref (answer_caps);
answer_caps = NULL;
}
if (trans_caps)
gst_caps_unref (trans_caps);
rtp_trans = NULL;
}
} else {
rtp_trans = NULL;
}
}
}
if (rtp_trans) {
answer_dir = rtp_trans->direction;
g_assert (answer_caps != NULL);
} else {
/* if no transceiver, then we only receive that stream and respond with
* the exact same caps */
/* FIXME: how to validate that subsequent elements can actually receive
* this payload/format */
answer_dir = GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY;
answer_caps = gst_caps_ref (offer_caps);
}
if (gst_caps_is_empty (answer_caps)) {
GST_WARNING_OBJECT (webrtc, "Could not create caps for media");
if (rtp_trans)
gst_object_unref (rtp_trans);
gst_caps_unref (answer_caps);
goto rejected;
}
seen_transceivers = g_list_prepend (seen_transceivers, rtp_trans);
if (!rtp_trans) {
trans = _create_webrtc_transceiver (webrtc, answer_dir, i);
rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans);
GST_LOG_OBJECT (webrtc, "Created new transceiver %" GST_PTR_FORMAT
" for mline %u", trans, i);
} else {
trans = WEBRTC_TRANSCEIVER (rtp_trans);
}
if (!trans->do_nack) {
answer_caps = gst_caps_make_writable (answer_caps);
for (k = 0; k < gst_caps_get_size (answer_caps); k++) {
GstStructure *s = gst_caps_get_structure (answer_caps, k);
gst_structure_remove_fields (s, "rtcp-fb-nack", NULL);
}
}
gst_sdp_media_set_media_from_caps (answer_caps, media);
_get_rtx_target_pt_and_ssrc_from_caps (answer_caps, &target_pt,
&target_ssrc);
original_target_pt = target_pt;
_media_add_fec (media, trans, offer_caps, &target_pt);
if (trans->do_nack) {
_media_add_rtx (media, trans, offer_caps, target_pt, target_ssrc);
if (target_pt != original_target_pt)
_media_add_rtx (media, trans, offer_caps, original_target_pt,
target_ssrc);
}
if (answer_dir != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY)
_media_add_ssrcs (media, answer_caps, webrtc,
WEBRTC_TRANSCEIVER (rtp_trans));
gst_caps_unref (answer_caps);
answer_caps = NULL;
/* set the new media direction */
offer_dir = _get_direction_from_media (offer_media);
answer_dir = _intersect_answer_directions (offer_dir, answer_dir);
if (answer_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE) {
GST_WARNING_OBJECT (webrtc, "Could not intersect offer direction with "
"transceiver direction");
goto rejected;
}
_media_replace_direction (media, answer_dir);
if (!trans->stream) {
TransportStream *item;
item =
_get_or_create_transport_stream (webrtc,
bundled_mids ? bundle_idx : i, FALSE);
webrtc_transceiver_set_transport (trans, item);
}
if (bundled_mids) {
const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid");
g_assert (mid);
g_string_append_printf (bundled_mids, " %s", mid);
}
/* set the a=fingerprint: for this transport */
_add_fingerprint_to_media (trans->stream->transport, media);
gst_caps_unref (offer_caps);
} else {
GST_WARNING_OBJECT (webrtc, "unknown m= line media name");
goto rejected;
}
if (0) {
rejected:
GST_INFO_OBJECT (webrtc, "media %u rejected", i);
gst_sdp_media_free (media);
gst_sdp_media_copy (offer_media, &media);
gst_sdp_media_set_port_info (media, 0, 0);
}
gst_sdp_message_add_media (ret, media);
gst_sdp_media_free (media);
}
if (bundled_mids) {
gchar *mids = g_string_free (bundled_mids, FALSE);
gst_sdp_message_add_attribute (ret, "group", mids);
g_free (mids);
}
if (bundle_ufrag)
g_free (bundle_ufrag);
if (bundle_pwd)
g_free (bundle_pwd);
/* FIXME: can we add not matched transceivers? */
/* XXX: only true for the initial offerer */
g_object_set (webrtc->priv->ice, "controller", FALSE, NULL);
out:
g_strfreev (bundled);
g_list_free (seen_transceivers);
if (webrtc->priv->last_generated_offer)
gst_webrtc_session_description_free (webrtc->priv->last_generated_offer);
webrtc->priv->last_generated_offer = NULL;
if (webrtc->priv->last_generated_answer)
gst_webrtc_session_description_free (webrtc->priv->last_generated_answer);
{
GstSDPMessage *copy;
gst_sdp_message_copy (ret, &copy);
webrtc->priv->last_generated_answer =
gst_webrtc_session_description_new (GST_WEBRTC_SDP_TYPE_ANSWER, copy);
}
return ret;
}
struct create_sdp
{
GstStructure *options;
GstPromise *promise;
GstWebRTCSDPType type;
};
static void
_create_sdp_task (GstWebRTCBin * webrtc, struct create_sdp *data)
{
GstWebRTCSessionDescription *desc = NULL;
GstSDPMessage *sdp = NULL;
GstStructure *s = NULL;
GST_INFO_OBJECT (webrtc, "creating %s sdp with options %" GST_PTR_FORMAT,
gst_webrtc_sdp_type_to_string (data->type), data->options);
if (data->type == GST_WEBRTC_SDP_TYPE_OFFER)
sdp = _create_offer_task (webrtc, data->options);
else if (data->type == GST_WEBRTC_SDP_TYPE_ANSWER)
sdp = _create_answer_task (webrtc, data->options);
else {
g_assert_not_reached ();
goto out;
}
if (sdp) {
desc = gst_webrtc_session_description_new (data->type, sdp);
s = gst_structure_new ("application/x-gst-promise",
gst_webrtc_sdp_type_to_string (data->type),
GST_TYPE_WEBRTC_SESSION_DESCRIPTION, desc, NULL);
}
out:
PC_UNLOCK (webrtc);
gst_promise_reply (data->promise, s);
PC_LOCK (webrtc);
if (desc)
gst_webrtc_session_description_free (desc);
}
static void
_free_create_sdp_data (struct create_sdp *data)
{
if (data->options)
gst_structure_free (data->options);
gst_promise_unref (data->promise);
g_free (data);
}
static void
gst_webrtc_bin_create_offer (GstWebRTCBin * webrtc,
const GstStructure * options, GstPromise * promise)
{
struct create_sdp *data = g_new0 (struct create_sdp, 1);
if (options)
data->options = gst_structure_copy (options);
data->promise = gst_promise_ref (promise);
data->type = GST_WEBRTC_SDP_TYPE_OFFER;
gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _create_sdp_task,
data, (GDestroyNotify) _free_create_sdp_data);
}
static void
gst_webrtc_bin_create_answer (GstWebRTCBin * webrtc,
const GstStructure * options, GstPromise * promise)
{
struct create_sdp *data = g_new0 (struct create_sdp, 1);
if (options)
data->options = gst_structure_copy (options);
data->promise = gst_promise_ref (promise);
data->type = GST_WEBRTC_SDP_TYPE_ANSWER;
gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _create_sdp_task,
data, (GDestroyNotify) _free_create_sdp_data);
}
static GstWebRTCBinPad *
_create_pad_for_sdp_media (GstWebRTCBin * webrtc, GstPadDirection direction,
guint media_idx)
{
GstWebRTCBinPad *pad;
gchar *pad_name;
pad_name =
g_strdup_printf ("%s_%u", direction == GST_PAD_SRC ? "src" : "sink",
media_idx);
pad = gst_webrtc_bin_pad_new (pad_name, direction);
g_free (pad_name);
pad->mlineindex = media_idx;
return pad;
}
static GstWebRTCRTPTransceiver *
_find_transceiver_for_sdp_media (GstWebRTCBin * webrtc,
const GstSDPMessage * sdp, guint media_idx)
{
const GstSDPMedia *media = gst_sdp_message_get_media (sdp, media_idx);
GstWebRTCRTPTransceiver *ret = NULL;
int i;
for (i = 0; i < gst_sdp_media_attributes_len (media); i++) {
const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, i);
if (g_strcmp0 (attr->key, "mid") == 0) {
if ((ret =
_find_transceiver (webrtc, attr->value,
(FindTransceiverFunc) match_for_mid)))
goto out;
}
}
ret = _find_transceiver (webrtc, &media_idx,
(FindTransceiverFunc) transceiver_match_for_mline);
out:
GST_TRACE_OBJECT (webrtc, "Found transceiver %" GST_PTR_FORMAT, ret);
return ret;
}
static GstPad *
_connect_input_stream (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad)
{
/*
* Not-bundle case:
*
* ,-------------------------webrtcbin-------------------------,
* ; ;
* ; ,-------rtpbin-------, ,--transport_send_%u--, ;
* ; ; send_rtp_src_%u o---o rtp_sink ; ;
* ; ; ; ; ; ;
* ; ; send_rtcp_src_%u o---o rtcp_sink ; ;
* ; sink_%u ; ; '---------------------' ;
* o----------o send_rtp_sink_%u ; ;
* ; '--------------------' ;
* '--------------------- -------------------------------------'
*/
/*
* Bundle case:
* ,--------------------------------webrtcbin--------------------------------,
* ; ;
* ; ,-------rtpbin-------, ,--transport_send_%u--, ;
* ; ; send_rtp_src_%u o---o rtp_sink ; ;
* ; ; ; ; ; ;
* ; ; send_rtcp_src_%u o---o rtcp_sink ; ;
* ; sink_%u ,---funnel---, ; ; '---------------------' ;
* o---------o sink_%u ; ; ; ;
* ; sink_%u ; src o-o send_rtp_sink_%u ; ;
* o---------o sink_%u ; ; ; ;
* ; '------------' '--------------------' ;
* '-------------------------------------------------------------------------'
*/
GstPadTemplate *rtp_templ;
GstPad *rtp_sink;
gchar *pad_name;
WebRTCTransceiver *trans;
g_return_val_if_fail (pad->trans != NULL, NULL);
GST_INFO_OBJECT (pad, "linking input stream %u", pad->mlineindex);
trans = WEBRTC_TRANSCEIVER (pad->trans);
g_assert (trans->stream);
if (!webrtc->rtpfunnel) {
rtp_templ =
_find_pad_template (webrtc->rtpbin, GST_PAD_SINK, GST_PAD_REQUEST,
"send_rtp_sink_%u");
g_assert (rtp_templ);
pad_name = g_strdup_printf ("send_rtp_sink_%u", pad->mlineindex);
rtp_sink =
gst_element_request_pad (webrtc->rtpbin, rtp_templ, pad_name, NULL);
g_free (pad_name);
gst_ghost_pad_set_target (GST_GHOST_PAD (pad), rtp_sink);
gst_object_unref (rtp_sink);
pad_name = g_strdup_printf ("send_rtp_src_%u", pad->mlineindex);
if (!gst_element_link_pads (GST_ELEMENT (webrtc->rtpbin), pad_name,
GST_ELEMENT (trans->stream->send_bin), "rtp_sink"))
g_warn_if_reached ();
g_free (pad_name);
} else {
gchar *pad_name = g_strdup_printf ("sink_%u", pad->mlineindex);
GstPad *funnel_sinkpad =
gst_element_get_request_pad (webrtc->rtpfunnel, pad_name);
gst_ghost_pad_set_target (GST_GHOST_PAD (pad), funnel_sinkpad);
g_free (pad_name);
gst_object_unref (funnel_sinkpad);
}
gst_element_sync_state_with_parent (GST_ELEMENT (trans->stream->send_bin));
return GST_PAD (pad);
}
/* output pads are receiving elements */
static void
_connect_output_stream (GstWebRTCBin * webrtc,
TransportStream * stream, guint session_id)
{
/*
* ,------------------------webrtcbin------------------------,
* ; ,---------rtpbin---------, ;
* ; ,-transport_receive_%u--, ; ; ;
* ; ; rtp_src o---o recv_rtp_sink_%u ; ;
* ; ; ; ; ; ;
* ; ; rtcp_src o---o recv_rtcp_sink_%u ; ;
* ; '-----------------------' ; ; ; src_%u
* ; ; recv_rtp_src_%u_%u_%u o--o
* ; '------------------------' ;
* '---------------------------------------------------------'
*/
gchar *pad_name;
if (stream->output_connected) {
GST_DEBUG_OBJECT (webrtc, "stream %" GST_PTR_FORMAT " is already "
"connected to rtpbin. Not connecting", stream);
return;
}
GST_INFO_OBJECT (webrtc, "linking output stream %u %" GST_PTR_FORMAT,
session_id, stream);
pad_name = g_strdup_printf ("recv_rtp_sink_%u", session_id);
if (!gst_element_link_pads (GST_ELEMENT (stream->receive_bin),
"rtp_src", GST_ELEMENT (webrtc->rtpbin), pad_name))
g_warn_if_reached ();
g_free (pad_name);
gst_element_sync_state_with_parent (GST_ELEMENT (stream->receive_bin));
/* The webrtcbin src_%u output pads will be created when rtpbin receives
* data on that stream in on_rtpbin_pad_added() */
stream->output_connected = TRUE;
}
typedef struct
{
guint mlineindex;
gchar *candidate;
} IceCandidateItem;
static void
_clear_ice_candidate_item (IceCandidateItem * item)
{
g_free (item->candidate);
}
static void
_add_ice_candidate (GstWebRTCBin * webrtc, IceCandidateItem * item,
gboolean drop_invalid)
{
GstWebRTCICEStream *stream;
stream = _find_ice_stream_for_session (webrtc, item->mlineindex);
if (stream == NULL) {
if (drop_invalid) {
GST_WARNING_OBJECT (webrtc, "Unknown mline %u, dropping",
item->mlineindex);
} else {
IceCandidateItem new;
new.mlineindex = item->mlineindex;
new.candidate = g_strdup (item->candidate);
GST_INFO_OBJECT (webrtc, "Unknown mline %u, deferring", item->mlineindex);
ICE_LOCK (webrtc);
g_array_append_val (webrtc->priv->pending_remote_ice_candidates, new);
ICE_UNLOCK (webrtc);
}
return;
}
GST_LOG_OBJECT (webrtc, "adding ICE candidate with mline:%u, %s",
item->mlineindex, item->candidate);
gst_webrtc_ice_add_candidate (webrtc->priv->ice, stream, item->candidate);
}
static void
_add_ice_candidates_from_sdp (GstWebRTCBin * webrtc, gint mlineindex,
const GstSDPMedia * media)
{
gint a;
GstWebRTCICEStream *stream = NULL;
for (a = 0; a < gst_sdp_media_attributes_len (media); a++) {
const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, a);
if (g_strcmp0 (attr->key, "candidate") == 0) {
gchar *candidate;
if (stream == NULL)
stream = _find_ice_stream_for_session (webrtc, mlineindex);
if (stream == NULL) {
GST_WARNING_OBJECT (webrtc,
"Unknown mline %u, dropping ICE candidates from SDP", mlineindex);
return;
}
candidate = g_strdup_printf ("a=candidate:%s", attr->value);
GST_LOG_OBJECT (webrtc, "adding ICE candidate with mline:%u, %s",
mlineindex, candidate);
gst_webrtc_ice_add_candidate (webrtc->priv->ice, stream, candidate);
g_free (candidate);
}
}
}
static void
_add_ice_candidate_to_sdp (GstWebRTCBin * webrtc,
GstSDPMessage * sdp, gint mline_index, const gchar * candidate)
{
GstSDPMedia *media = NULL;
if (mline_index < sdp->medias->len) {
media = &g_array_index (sdp->medias, GstSDPMedia, mline_index);
}
if (media == NULL) {
GST_WARNING_OBJECT (webrtc, "Couldn't find mline %d to merge ICE candidate",
mline_index);
return;
}
// Add the candidate as an attribute, first stripping off the existing
// candidate: key from the string description
if (strlen (candidate) < 10) {
GST_WARNING_OBJECT (webrtc,
"Dropping invalid ICE candidate for mline %d: %s", mline_index,
candidate);
return;
}
gst_sdp_media_add_attribute (media, "candidate", candidate + 10);
}
static gboolean
_filter_sdp_fields (GQuark field_id, const GValue * value,
GstStructure * new_structure)
{
if (!g_str_has_prefix (g_quark_to_string (field_id), "a-")) {
gst_structure_id_set_value (new_structure, field_id, value);
}
return TRUE;
}
static void
_set_rtx_ptmap_from_stream (GstWebRTCBin * webrtc, TransportStream * stream)
{
gint *rtx_pt;
gsize rtx_count;
rtx_pt = transport_stream_get_all_pt (stream, "RTX", &rtx_count);
GST_LOG_OBJECT (stream, "have %" G_GSIZE_FORMAT " rtx payloads", rtx_count);
if (rtx_pt) {
GstStructure *pt_map = gst_structure_new_empty ("application/x-rtp-pt-map");
gsize i;
for (i = 0; i < rtx_count; i++) {
GstCaps *rtx_caps = transport_stream_get_caps_for_pt (stream, rtx_pt[i]);
const GstStructure *s = gst_caps_get_structure (rtx_caps, 0);
const gchar *apt = gst_structure_get_string (s, "apt");
GST_LOG_OBJECT (stream, "setting rtx mapping: %s -> %u", apt, rtx_pt[i]);
gst_structure_set (pt_map, apt, G_TYPE_UINT, rtx_pt[i], NULL);
}
GST_DEBUG_OBJECT (stream, "setting payload map on %" GST_PTR_FORMAT " : %"
GST_PTR_FORMAT " and %" GST_PTR_FORMAT, stream->rtxreceive,
stream->rtxsend, pt_map);
if (stream->rtxreceive)
g_object_set (stream->rtxreceive, "payload-type-map", pt_map, NULL);
if (stream->rtxsend)
g_object_set (stream->rtxsend, "payload-type-map", pt_map, NULL);
gst_structure_free (pt_map);
}
}
static void
_update_transport_ptmap_from_media (GstWebRTCBin * webrtc,
TransportStream * stream, const GstSDPMessage * sdp, guint media_idx)
{
guint i, len;
const gchar *proto;
const GstSDPMedia *media = gst_sdp_message_get_media (sdp, media_idx);
/* get proto */
proto = gst_sdp_media_get_proto (media);
if (proto != NULL) {
/* Parse global SDP attributes once */
GstCaps *global_caps = gst_caps_new_empty_simple ("application/x-unknown");
GST_DEBUG_OBJECT (webrtc, "mapping sdp session level attributes to caps");
gst_sdp_message_attributes_to_caps (sdp, global_caps);
GST_DEBUG_OBJECT (webrtc, "mapping sdp media level attributes to caps");
gst_sdp_media_attributes_to_caps (media, global_caps);
len = gst_sdp_media_formats_len (media);
for (i = 0; i < len; i++) {
GstCaps *caps, *outcaps;
GstStructure *s;
PtMapItem item;
gint pt;
guint j;
pt = atoi (gst_sdp_media_get_format (media, i));
GST_DEBUG_OBJECT (webrtc, " looking at %d pt: %d", i, pt);
/* convert caps */
caps = gst_sdp_media_get_caps_from_media (media, pt);
if (caps == NULL) {
GST_WARNING_OBJECT (webrtc, " skipping pt %d without caps", pt);
continue;
}
/* Merge in global caps */
/* Intersect will merge in missing fields to the current caps */
outcaps = gst_caps_intersect (caps, global_caps);
gst_caps_unref (caps);
s = gst_caps_get_structure (outcaps, 0);
gst_structure_set_name (s, "application/x-rtp");
if (!g_strcmp0 (gst_structure_get_string (s, "encoding-name"), "ULPFEC"))
gst_structure_set (s, "is-fec", G_TYPE_BOOLEAN, TRUE, NULL);
item.caps = gst_caps_new_empty ();
for (j = 0; j < gst_caps_get_size (outcaps); j++) {
GstStructure *s = gst_caps_get_structure (outcaps, j);
GstStructure *filtered =
gst_structure_new_empty (gst_structure_get_name (s));
gst_structure_foreach (s,
(GstStructureForeachFunc) _filter_sdp_fields, filtered);
gst_caps_append_structure (item.caps, filtered);
}
item.pt = pt;
gst_caps_unref (outcaps);
g_array_append_val (stream->ptmap, item);
}
gst_caps_unref (global_caps);
}
}
static void
_update_transceiver_from_sdp_media (GstWebRTCBin * webrtc,
const GstSDPMessage * sdp, guint media_idx,
TransportStream * stream, GstWebRTCRTPTransceiver * rtp_trans,
GStrv bundled, guint bundle_idx)
{
WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans);
GstWebRTCRTPTransceiverDirection prev_dir = rtp_trans->current_direction;
GstWebRTCRTPTransceiverDirection new_dir;
const GstSDPMedia *media = gst_sdp_message_get_media (sdp, media_idx);
GstWebRTCDTLSSetup new_setup;
gboolean new_rtcp_mux, new_rtcp_rsize;
ReceiveState receive_state = RECEIVE_STATE_UNSET;
int i;
rtp_trans->mline = media_idx;
for (i = 0; i < gst_sdp_media_attributes_len (media); i++) {
const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, i);
if (g_strcmp0 (attr->key, "mid") == 0) {
g_free (rtp_trans->mid);
rtp_trans->mid = g_strdup (attr->value);
}
}
{
const GstSDPMedia *local_media, *remote_media;
GstWebRTCRTPTransceiverDirection local_dir, remote_dir;
GstWebRTCDTLSSetup local_setup, remote_setup;
local_media =
gst_sdp_message_get_media (webrtc->current_local_description->sdp,
media_idx);
remote_media =
gst_sdp_message_get_media (webrtc->current_remote_description->sdp,
media_idx);
local_setup = _get_dtls_setup_from_media (local_media);
remote_setup = _get_dtls_setup_from_media (remote_media);
new_setup = _get_final_setup (local_setup, remote_setup);
if (new_setup == GST_WEBRTC_DTLS_SETUP_NONE)
return;
local_dir = _get_direction_from_media (local_media);
remote_dir = _get_direction_from_media (remote_media);
new_dir = _get_final_direction (local_dir, remote_dir);
if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE)
return;
if (prev_dir != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE
&& new_dir != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE
&& prev_dir != new_dir) {
GST_FIXME_OBJECT (webrtc, "implement transceiver direction changes");
return;
}
if (!bundled || bundle_idx == media_idx) {
new_rtcp_mux = _media_has_attribute_key (local_media, "rtcp-mux")
&& _media_has_attribute_key (remote_media, "rtcp-mux");
new_rtcp_rsize = _media_has_attribute_key (local_media, "rtcp-rsize")
&& _media_has_attribute_key (remote_media, "rtcp-rsize");
{
GObject *session;
g_signal_emit_by_name (webrtc->rtpbin, "get-internal-session",
media_idx, &session);
if (session) {
g_object_set (session, "rtcp-reduced-size", new_rtcp_rsize, NULL);
g_object_unref (session);
}
}
g_object_set (stream, "rtcp-mux", new_rtcp_mux, NULL);
}
}
if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE) {
if (!bundled) {
/* Not a bundled stream means this entire transport is inactive,
* so set the receive state to BLOCK below */
stream->active = FALSE;
receive_state = RECEIVE_STATE_BLOCK;
}
} else {
/* If this transceiver is active for sending or receiving,
* we still need receive at least RTCP, so need to unblock
* the receive bin below. */
GST_LOG_OBJECT (webrtc, "marking stream %p as active", stream);
receive_state = RECEIVE_STATE_PASS;
stream->active = TRUE;
}
if (new_dir != prev_dir) {
GST_DEBUG_OBJECT (webrtc, "transceiver direction change");
if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE) {
GstWebRTCBinPad *pad;
pad = _find_pad_for_mline (webrtc, GST_PAD_SRC, media_idx);
if (pad) {
GstPad *target = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
if (target) {
GstPad *peer = gst_pad_get_peer (target);
if (peer) {
gst_pad_send_event (peer, gst_event_new_eos ());
gst_object_unref (peer);
}
gst_object_unref (target);
}
gst_object_unref (pad);
}
/* XXX: send eos event up the sink pad as well? */
}
if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY ||
new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV) {
GstWebRTCBinPad *pad =
_find_pad_for_mline (webrtc, GST_PAD_SINK, media_idx);
if (pad) {
GST_DEBUG_OBJECT (webrtc, "found existing send pad %" GST_PTR_FORMAT
" for transceiver %" GST_PTR_FORMAT, pad, trans);
g_assert (pad->trans == rtp_trans);
g_assert (pad->mlineindex == media_idx);
gst_object_unref (pad);
} else {
GST_DEBUG_OBJECT (webrtc,
"creating new send pad for transceiver %" GST_PTR_FORMAT, trans);
pad = _create_pad_for_sdp_media (webrtc, GST_PAD_SINK, media_idx);
pad->trans = gst_object_ref (rtp_trans);
_connect_input_stream (webrtc, pad);
_add_pad (webrtc, pad);
}
}
if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY ||
new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV) {
GstWebRTCBinPad *pad =
_find_pad_for_mline (webrtc, GST_PAD_SRC, media_idx);
if (pad) {
GST_DEBUG_OBJECT (webrtc, "found existing receive pad %" GST_PTR_FORMAT
" for transceiver %" GST_PTR_FORMAT, pad, trans);
g_assert (pad->trans == rtp_trans);
g_assert (pad->mlineindex == media_idx);
gst_object_unref (pad);
} else {
GST_DEBUG_OBJECT (webrtc,
"creating new receive pad for transceiver %" GST_PTR_FORMAT, trans);
pad = _create_pad_for_sdp_media (webrtc, GST_PAD_SRC, media_idx);
pad->trans = gst_object_ref (rtp_trans);
if (!trans->stream) {
TransportStream *item;
item =
_get_or_create_transport_stream (webrtc,
bundled ? bundle_idx : media_idx, FALSE);
webrtc_transceiver_set_transport (trans, item);
}
_connect_output_stream (webrtc, trans->stream,
bundled ? bundle_idx : media_idx);
/* delay adding the pad until rtpbin creates the recv output pad
* to ghost to so queries/events travel through the pipeline correctly
* as soon as the pad is added */
_add_pad_to_list (webrtc, pad);
}
}
rtp_trans->mline = media_idx;
rtp_trans->current_direction = new_dir;
}
if (!bundled || bundle_idx == media_idx) {
if (stream->rtxsend || stream->rtxreceive) {
_set_rtx_ptmap_from_stream (webrtc, stream);
}
g_object_set (stream, "dtls-client",
new_setup == GST_WEBRTC_DTLS_SETUP_ACTIVE, NULL);
}
/* Must be after setting the "dtls-client" so that data is not pushed into
* the dtlssrtp elements before the ssl direction has been set which will
* throw SSL errors */
if (receive_state != RECEIVE_STATE_UNSET)
transport_receive_bin_set_receive_state (stream->receive_bin,
receive_state);
}
/* must be called with the pc lock held */
static gint
_generate_data_channel_id (GstWebRTCBin * webrtc)
{
gboolean is_client;
gint new_id = -1, max_channels = 0;
if (webrtc->priv->sctp_transport) {
g_object_get (webrtc->priv->sctp_transport, "max-channels", &max_channels,
NULL);
}
if (max_channels <= 0) {
max_channels = 65534;
}
g_object_get (webrtc->priv->sctp_transport->transport, "client", &is_client,
NULL);
/* TODO: a better search algorithm */
do {
GstWebRTCDataChannel *channel;
new_id++;
if (new_id < 0 || new_id >= max_channels) {
/* exhausted id space */
GST_WARNING_OBJECT (webrtc, "Could not find a suitable "
"data channel id (max %i)", max_channels);
return -1;
}
/* client must generate even ids, server must generate odd ids */
if (new_id % 2 == ! !is_client)
continue;
channel = _find_data_channel_for_id (webrtc, new_id);
if (!channel)
break;
} while (TRUE);
return new_id;
}
static void
_update_data_channel_from_sdp_media (GstWebRTCBin * webrtc,
const GstSDPMessage * sdp, guint media_idx, TransportStream * stream)
{
const GstSDPMedia *local_media, *remote_media;
GstWebRTCDTLSSetup local_setup, remote_setup, new_setup;
TransportReceiveBin *receive;
int local_port, remote_port;
guint64 local_max_size, remote_max_size, max_size;
int i;
local_media =
gst_sdp_message_get_media (webrtc->current_local_description->sdp,
media_idx);
remote_media =
gst_sdp_message_get_media (webrtc->current_remote_description->sdp,
media_idx);
local_setup = _get_dtls_setup_from_media (local_media);
remote_setup = _get_dtls_setup_from_media (remote_media);
new_setup = _get_final_setup (local_setup, remote_setup);
if (new_setup == GST_WEBRTC_DTLS_SETUP_NONE)
return;
/* data channel is always rtcp-muxed to avoid generating ICE candidates
* for RTCP */
g_object_set (stream, "rtcp-mux", TRUE, "dtls-client",
new_setup == GST_WEBRTC_DTLS_SETUP_ACTIVE, NULL);
local_port = _get_sctp_port_from_media (local_media);
remote_port = _get_sctp_port_from_media (local_media);
if (local_port == -1 || remote_port == -1)
return;
if (0 == (local_max_size =
_get_sctp_max_message_size_from_media (local_media)))
local_max_size = G_MAXUINT64;
if (0 == (remote_max_size =
_get_sctp_max_message_size_from_media (remote_media)))
remote_max_size = G_MAXUINT64;
max_size = MIN (local_max_size, remote_max_size);
webrtc->priv->sctp_transport->max_message_size = max_size;
{
guint orig_local_port, orig_remote_port;
/* XXX: sctpassociation warns if we are in the wrong state */
g_object_get (webrtc->priv->sctp_transport->sctpdec, "local-sctp-port",
&orig_local_port, NULL);
if (orig_local_port != local_port)
g_object_set (webrtc->priv->sctp_transport->sctpdec, "local-sctp-port",
local_port, NULL);
g_object_get (webrtc->priv->sctp_transport->sctpenc, "remote-sctp-port",
&orig_remote_port, NULL);
if (orig_remote_port != remote_port)
g_object_set (webrtc->priv->sctp_transport->sctpenc, "remote-sctp-port",
remote_port, NULL);
}
for (i = 0; i < webrtc->priv->data_channels->len; i++) {
GstWebRTCDataChannel *channel;
channel = g_ptr_array_index (webrtc->priv->data_channels, i);
if (channel->id == -1)
channel->id = _generate_data_channel_id (webrtc);
if (channel->id == -1)
GST_ELEMENT_WARNING (webrtc, RESOURCE, NOT_FOUND,
("%s", "Failed to generate an identifier for a data channel"), NULL);
if (webrtc->priv->sctp_transport->association_established
&& !channel->negotiated && !channel->opened) {
gst_webrtc_data_channel_link_to_sctp (channel,
webrtc->priv->sctp_transport);
gst_webrtc_data_channel_start_negotiation (channel);
}
}
receive = TRANSPORT_RECEIVE_BIN (stream->receive_bin);
transport_receive_bin_set_receive_state (receive, RECEIVE_STATE_PASS);
}
static gboolean
_find_compatible_unassociated_transceiver (GstWebRTCRTPTransceiver * p1,
gconstpointer data)
{
if (p1->mid)
return FALSE;
if (p1->mline != -1)
return FALSE;
if (p1->stopped)
return FALSE;
return TRUE;
}
static void
_connect_rtpfunnel (GstWebRTCBin * webrtc, guint session_id)
{
gchar *pad_name;
GstPad *queue_srcpad;
GstPad *rtp_sink;
TransportStream *stream = _find_transport_for_session (webrtc, session_id);
GstElement *queue;
g_assert (stream);
if (webrtc->rtpfunnel)
goto done;
webrtc->rtpfunnel = gst_element_factory_make ("rtpfunnel", NULL);
gst_bin_add (GST_BIN (webrtc), webrtc->rtpfunnel);
gst_element_sync_state_with_parent (webrtc->rtpfunnel);
queue = gst_element_factory_make ("queue", NULL);
gst_bin_add (GST_BIN (webrtc), queue);
gst_element_sync_state_with_parent (queue);
gst_element_link (webrtc->rtpfunnel, queue);
queue_srcpad = gst_element_get_static_pad (queue, "src");
pad_name = g_strdup_printf ("send_rtp_sink_%d", session_id);
rtp_sink = gst_element_get_request_pad (webrtc->rtpbin, pad_name);
g_free (pad_name);
gst_pad_link (queue_srcpad, rtp_sink);
gst_object_unref (queue_srcpad);
gst_object_unref (rtp_sink);
pad_name = g_strdup_printf ("send_rtp_src_%d", session_id);
if (!gst_element_link_pads (GST_ELEMENT (webrtc->rtpbin), pad_name,
GST_ELEMENT (stream->send_bin), "rtp_sink"))
g_warn_if_reached ();
g_free (pad_name);
done:
return;
}
static gboolean
_update_transceivers_from_sdp (GstWebRTCBin * webrtc, SDPSource source,
GstWebRTCSessionDescription * sdp)
{
int i;
gboolean ret = FALSE;
GStrv bundled = NULL;
guint bundle_idx = 0;
TransportStream *bundle_stream = NULL;
/* FIXME: With some peers, it's possible we could have
* multiple bundles to deal with, although I've never seen one yet */
if (!_parse_bundle (sdp->sdp, &bundled))
goto done;
if (bundled) {
if (!_get_bundle_index (sdp->sdp, bundled, &bundle_idx)) {
GST_ERROR_OBJECT (webrtc, "Bundle tag is %s but no media found matching",
bundled[0]);
goto done;
}
bundle_stream = _get_or_create_transport_stream (webrtc, bundle_idx,
_message_media_is_datachannel (sdp->sdp, bundle_idx));
/* Mark the bundle stream as inactive to start. It will be set to TRUE
* by any bundled mline that is active, and at the end we set the
* receivebin to BLOCK if all mlines were inactive. */
bundle_stream->active = FALSE;
g_array_set_size (bundle_stream->ptmap, 0);
for (i = 0; i < gst_sdp_message_medias_len (sdp->sdp); i++) {
/* When bundling, we need to do this up front, or else RTX
* parameters aren't set up properly for the bundled streams */
_update_transport_ptmap_from_media (webrtc, bundle_stream, sdp->sdp, i);
}
_connect_rtpfunnel (webrtc, bundle_idx);
}
for (i = 0; i < gst_sdp_message_medias_len (sdp->sdp); i++) {
const GstSDPMedia *media = gst_sdp_message_get_media (sdp->sdp, i);
TransportStream *stream;
GstWebRTCRTPTransceiver *trans;
guint transport_idx;
/* skip rejected media */
if (gst_sdp_media_get_port (media) == 0)
continue;
if (bundled)
transport_idx = bundle_idx;
else
transport_idx = i;
trans = _find_transceiver_for_sdp_media (webrtc, sdp->sdp, i);
stream = _get_or_create_transport_stream (webrtc, transport_idx,
_message_media_is_datachannel (sdp->sdp, transport_idx));
if (!bundled) {
/* When bundling, these were all set up above, but when not
* bundling we need to do it now */
g_array_set_size (stream->ptmap, 0);
_update_transport_ptmap_from_media (webrtc, stream, sdp->sdp, i);
}
if (trans)
webrtc_transceiver_set_transport ((WebRTCTransceiver *) trans, stream);
if (source == SDP_LOCAL && sdp->type == GST_WEBRTC_SDP_TYPE_OFFER && !trans) {
GST_ERROR ("State mismatch. Could not find local transceiver by mline.");
goto done;
} else {
if (g_strcmp0 (gst_sdp_media_get_media (media), "audio") == 0 ||
g_strcmp0 (gst_sdp_media_get_media (media), "video") == 0) {
/* No existing transceiver, find an unused one */
if (!trans) {
trans = _find_transceiver (webrtc, NULL,
(FindTransceiverFunc) _find_compatible_unassociated_transceiver);
}
/* Still no transceiver? Create one */
/* XXX: default to the advertised direction in the sdp for new
* transceivers. The spec doesn't actually say what happens here, only
* that calls to setDirection will change the value. Nothing about
* a default value when the transceiver is created internally */
if (!trans) {
trans =
GST_WEBRTC_RTP_TRANSCEIVER (_create_webrtc_transceiver (webrtc,
_get_direction_from_media (media), i));
}
_update_transceiver_from_sdp_media (webrtc, sdp->sdp, i, stream,
trans, bundled, bundle_idx);
} else if (_message_media_is_datachannel (sdp->sdp, i)) {
_update_data_channel_from_sdp_media (webrtc, sdp->sdp, i, stream);
} else {
GST_ERROR_OBJECT (webrtc, "Unknown media type in SDP at index %u", i);
}
}
}
if (bundle_stream && bundle_stream->active == FALSE) {
/* No bundled mline marked the bundle as active, so block the receive bin, as
* this bundle is completely inactive */
GST_LOG_OBJECT (webrtc,
"All mlines in bundle %u are inactive. Blocking receiver", bundle_idx);
transport_receive_bin_set_receive_state (bundle_stream->receive_bin,
RECEIVE_STATE_BLOCK);
}
ret = TRUE;
done:
g_strfreev (bundled);
return ret;
}
struct set_description
{
GstPromise *promise;
SDPSource source;
GstWebRTCSessionDescription *sdp;
};
/* http://w3c.github.io/webrtc-pc/#set-description */
static void
_set_description_task (GstWebRTCBin * webrtc, struct set_description *sd)
{
GstWebRTCSignalingState new_signaling_state = webrtc->signaling_state;
gboolean signalling_state_changed = FALSE;
GError *error = NULL;
GStrv bundled = NULL;
guint bundle_idx = 0;
guint i;
{
gchar *state = _enum_value_to_string (GST_TYPE_WEBRTC_SIGNALING_STATE,
webrtc->signaling_state);
gchar *type_str =
_enum_value_to_string (GST_TYPE_WEBRTC_SDP_TYPE, sd->sdp->type);
gchar *sdp_text = gst_sdp_message_as_text (sd->sdp->sdp);
GST_INFO_OBJECT (webrtc, "Attempting to set %s %s in the %s state",
_sdp_source_to_string (sd->source), type_str, state);
GST_TRACE_OBJECT (webrtc, "SDP contents\n%s", sdp_text);
g_free (sdp_text);
g_free (state);
g_free (type_str);
}
if (!validate_sdp (webrtc->signaling_state, sd->source, sd->sdp, &error)) {
GST_ERROR_OBJECT (webrtc, "%s", error->message);
g_clear_error (&error);
goto out;
}
if (webrtc->priv->is_closed) {
GST_WARNING_OBJECT (webrtc, "we are closed");
goto out;
}
if (!_parse_bundle (sd->sdp->sdp, &bundled))
goto out;
if (bundled) {
if (!_get_bundle_index (sd->sdp->sdp, bundled, &bundle_idx)) {
GST_ERROR_OBJECT (webrtc, "Bundle tag is %s but no media found matching",
bundled[0]);
goto out;
}
}
switch (sd->sdp->type) {
case GST_WEBRTC_SDP_TYPE_OFFER:{
if (sd->source == SDP_LOCAL) {
if (webrtc->pending_local_description)
gst_webrtc_session_description_free
(webrtc->pending_local_description);
webrtc->pending_local_description =
gst_webrtc_session_description_copy (sd->sdp);
new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_LOCAL_OFFER;
} else {
if (webrtc->pending_remote_description)
gst_webrtc_session_description_free
(webrtc->pending_remote_description);
webrtc->pending_remote_description =
gst_webrtc_session_description_copy (sd->sdp);
new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_REMOTE_OFFER;
}
break;
}
case GST_WEBRTC_SDP_TYPE_ANSWER:{
if (sd->source == SDP_LOCAL) {
if (webrtc->current_local_description)
gst_webrtc_session_description_free
(webrtc->current_local_description);
webrtc->current_local_description =
gst_webrtc_session_description_copy (sd->sdp);
if (webrtc->current_remote_description)
gst_webrtc_session_description_free
(webrtc->current_remote_description);
webrtc->current_remote_description = webrtc->pending_remote_description;
webrtc->pending_remote_description = NULL;
} else {
if (webrtc->current_remote_description)
gst_webrtc_session_description_free
(webrtc->current_remote_description);
webrtc->current_remote_description =
gst_webrtc_session_description_copy (sd->sdp);
if (webrtc->current_local_description)
gst_webrtc_session_description_free
(webrtc->current_local_description);
webrtc->current_local_description = webrtc->pending_local_description;
webrtc->pending_local_description = NULL;
}
if (webrtc->pending_local_description)
gst_webrtc_session_description_free (webrtc->pending_local_description);
webrtc->pending_local_description = NULL;
if (webrtc->pending_remote_description)
gst_webrtc_session_description_free
(webrtc->pending_remote_description);
webrtc->pending_remote_description = NULL;
new_signaling_state = GST_WEBRTC_SIGNALING_STATE_STABLE;
break;
}
case GST_WEBRTC_SDP_TYPE_ROLLBACK:{
GST_FIXME_OBJECT (webrtc, "rollbacks are completely untested");
if (sd->source == SDP_LOCAL) {
if (webrtc->pending_local_description)
gst_webrtc_session_description_free
(webrtc->pending_local_description);
webrtc->pending_local_description = NULL;
} else {
if (webrtc->pending_remote_description)
gst_webrtc_session_description_free
(webrtc->pending_remote_description);
webrtc->pending_remote_description = NULL;
}
new_signaling_state = GST_WEBRTC_SIGNALING_STATE_STABLE;
break;
}
case GST_WEBRTC_SDP_TYPE_PRANSWER:{
GST_FIXME_OBJECT (webrtc, "pranswers are completely untested");
if (sd->source == SDP_LOCAL) {
if (webrtc->pending_local_description)
gst_webrtc_session_description_free
(webrtc->pending_local_description);
webrtc->pending_local_description =
gst_webrtc_session_description_copy (sd->sdp);
new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_LOCAL_PRANSWER;
} else {
if (webrtc->pending_remote_description)
gst_webrtc_session_description_free
(webrtc->pending_remote_description);
webrtc->pending_remote_description =
gst_webrtc_session_description_copy (sd->sdp);
new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_REMOTE_PRANSWER;
}
break;
}
}
if (sd->sdp->type == GST_WEBRTC_SDP_TYPE_ROLLBACK) {
/* FIXME:
* If the mid value of an RTCRtpTransceiver was set to a non-null value
* by the RTCSessionDescription that is being rolled back, set the mid
* value of that transceiver to null, as described by [JSEP]
* (section 4.1.7.2.).
* If an RTCRtpTransceiver was created by applying the
* RTCSessionDescription that is being rolled back, and a track has not
* been attached to it via addTrack, remove that transceiver from
* connection's set of transceivers, as described by [JSEP]
* (section 4.1.7.2.).
* Restore the value of connection's [[ sctpTransport]] internal slot
* to its value at the last stable signaling state.
*/
}
if (webrtc->signaling_state != new_signaling_state) {
webrtc->signaling_state = new_signaling_state;
signalling_state_changed = TRUE;
}
if (webrtc->signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE) {
GList *tmp;
/* media modifications */
_update_transceivers_from_sdp (webrtc, sd->source, sd->sdp);
for (tmp = webrtc->priv->pending_sink_transceivers; tmp; tmp = tmp->next) {
GstWebRTCBinPad *pad = GST_WEBRTC_BIN_PAD (tmp->data);
const GstSDPMedia *media;
media = gst_sdp_message_get_media (sd->sdp->sdp, pad->mlineindex);
/* skip rejected media */
/* FIXME: arrange for an appropriate flow return */
if (gst_sdp_media_get_port (media) == 0)
continue;
_connect_input_stream (webrtc, pad);
gst_pad_remove_probe (GST_PAD (pad), pad->block_id);
pad->block_id = 0;
}
g_list_free_full (webrtc->priv->pending_sink_transceivers,
(GDestroyNotify) gst_object_unref);
webrtc->priv->pending_sink_transceivers = NULL;
}
for (i = 0; i < gst_sdp_message_medias_len (sd->sdp->sdp); i++) {
gchar *ufrag, *pwd;
TransportStream *item;
item =
_get_or_create_transport_stream (webrtc, bundled ? bundle_idx : i,
_message_media_is_datachannel (sd->sdp->sdp, bundled ? bundle_idx : i));
if (sd->source == SDP_REMOTE) {
const GstSDPMedia *media = gst_sdp_message_get_media (sd->sdp->sdp, i);
guint j;
for (j = 0; j < gst_sdp_media_attributes_len (media); j++) {
const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, j);
if (g_strcmp0 (attr->key, "ssrc") == 0) {
GStrv split = g_strsplit (attr->value, " ", 0);
guint32 ssrc;
if (split[0] && sscanf (split[0], "%u", &ssrc) && split[1]
&& g_str_has_prefix (split[1], "cname:")) {
SsrcMapItem ssrc_item;
ssrc_item.media_idx = i;
ssrc_item.ssrc = ssrc;
g_array_append_val (item->remote_ssrcmap, ssrc_item);
}
g_strfreev (split);
}
}
}
if (bundled && bundle_idx != i)
continue;
_get_ice_credentials_from_sdp_media (sd->sdp->sdp, i, &ufrag, &pwd);
if (sd->source == SDP_LOCAL)
gst_webrtc_ice_set_local_credentials (webrtc->priv->ice,
item->stream, ufrag, pwd);
else
gst_webrtc_ice_set_remote_credentials (webrtc->priv->ice,
item->stream, ufrag, pwd);
g_free (ufrag);
g_free (pwd);
}
for (i = 0; i < webrtc->priv->ice_stream_map->len; i++) {
IceStreamItem *item =
&g_array_index (webrtc->priv->ice_stream_map, IceStreamItem, i);
gst_webrtc_ice_gather_candidates (webrtc->priv->ice, item->stream);
}
/* Add any pending trickle ICE candidates if we have both offer and answer */
if (webrtc->current_local_description && webrtc->current_remote_description) {
int i;
GstWebRTCSessionDescription *remote_sdp =
webrtc->current_remote_description;
/* Add any remote ICE candidates from the remote description to
* support non-trickle peers first */
for (i = 0; i < gst_sdp_message_medias_len (remote_sdp->sdp); i++) {
const GstSDPMedia *media = gst_sdp_message_get_media (remote_sdp->sdp, i);
_add_ice_candidates_from_sdp (webrtc, i, media);
}
ICE_LOCK (webrtc);
for (i = 0; i < webrtc->priv->pending_remote_ice_candidates->len; i++) {
IceCandidateItem *item =
&g_array_index (webrtc->priv->pending_remote_ice_candidates,
IceCandidateItem, i);
_add_ice_candidate (webrtc, item, TRUE);
}
g_array_set_size (webrtc->priv->pending_remote_ice_candidates, 0);
ICE_UNLOCK (webrtc);
}
/*
* If connection's signaling state changed above, fire an event named
* signalingstatechange at connection.
*/
if (signalling_state_changed) {
gchar *from = _enum_value_to_string (GST_TYPE_WEBRTC_SIGNALING_STATE,
webrtc->signaling_state);
gchar *to = _enum_value_to_string (GST_TYPE_WEBRTC_SIGNALING_STATE,
new_signaling_state);
GST_TRACE_OBJECT (webrtc, "notify signaling-state from %s "
"to %s", from, to);
PC_UNLOCK (webrtc);
g_object_notify (G_OBJECT (webrtc), "signaling-state");
PC_LOCK (webrtc);
g_free (from);
g_free (to);
}
if (webrtc->signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE) {
gboolean prev_need_negotiation = webrtc->priv->need_negotiation;
/* If connection's signaling state is now stable, update the
* negotiation-needed flag. If connection's [[ needNegotiation]] slot
* was true both before and after this update, queue a task to check
* connection's [[needNegotiation]] slot and, if still true, fire a
* simple event named negotiationneeded at connection.*/
_update_need_negotiation (webrtc);
if (prev_need_negotiation && webrtc->priv->need_negotiation) {
_check_need_negotiation_task (webrtc, NULL);
}
}
out:
g_strfreev (bundled);
PC_UNLOCK (webrtc);
gst_promise_reply (sd->promise, NULL);
PC_LOCK (webrtc);
}
static void
_free_set_description_data (struct set_description *sd)
{
if (sd->promise)
gst_promise_unref (sd->promise);
if (sd->sdp)
gst_webrtc_session_description_free (sd->sdp);
g_free (sd);
}
static void
gst_webrtc_bin_set_remote_description (GstWebRTCBin * webrtc,
GstWebRTCSessionDescription * remote_sdp, GstPromise * promise)
{
struct set_description *sd;
if (remote_sdp == NULL)
goto bad_input;
if (remote_sdp->sdp == NULL)
goto bad_input;
sd = g_new0 (struct set_description, 1);
if (promise != NULL)
sd->promise = gst_promise_ref (promise);
sd->source = SDP_REMOTE;
sd->sdp = gst_webrtc_session_description_copy (remote_sdp);
gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _set_description_task,
sd, (GDestroyNotify) _free_set_description_data);
return;
bad_input:
{
gst_promise_reply (promise, NULL);
g_return_if_reached ();
}
}
static void
gst_webrtc_bin_set_local_description (GstWebRTCBin * webrtc,
GstWebRTCSessionDescription * local_sdp, GstPromise * promise)
{
struct set_description *sd;
if (local_sdp == NULL)
goto bad_input;
if (local_sdp->sdp == NULL)
goto bad_input;
sd = g_new0 (struct set_description, 1);
if (promise != NULL)
sd->promise = gst_promise_ref (promise);
sd->source = SDP_LOCAL;
sd->sdp = gst_webrtc_session_description_copy (local_sdp);
gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _set_description_task,
sd, (GDestroyNotify) _free_set_description_data);
return;
bad_input:
{
gst_promise_reply (promise, NULL);
g_return_if_reached ();
}
}
static void
_add_ice_candidate_task (GstWebRTCBin * webrtc, IceCandidateItem * item)
{
if (!webrtc->current_local_description || !webrtc->current_remote_description) {
IceCandidateItem new;
new.mlineindex = item->mlineindex;
new.candidate = g_steal_pointer (&item->candidate);
ICE_LOCK (webrtc);
g_array_append_val (webrtc->priv->pending_remote_ice_candidates, new);
ICE_UNLOCK (webrtc);
} else {
_add_ice_candidate (webrtc, item, FALSE);
}
}
static void
_free_ice_candidate_item (IceCandidateItem * item)
{
_clear_ice_candidate_item (item);
g_free (item);
}
static void
gst_webrtc_bin_add_ice_candidate (GstWebRTCBin * webrtc, guint mline,
const gchar * attr)
{
IceCandidateItem *item;
item = g_new0 (IceCandidateItem, 1);
item->mlineindex = mline;
if (!g_ascii_strncasecmp (attr, "a=candidate:", 12))
item->candidate = g_strdup (attr);
else if (!g_ascii_strncasecmp (attr, "candidate:", 10))
item->candidate = g_strdup_printf ("a=%s", attr);
gst_webrtc_bin_enqueue_task (webrtc,
(GstWebRTCBinFunc) _add_ice_candidate_task, item,
(GDestroyNotify) _free_ice_candidate_item);
}
static void
_on_local_ice_candidate_task (GstWebRTCBin * webrtc)
{
gsize i;
GArray *items;
ICE_LOCK (webrtc);
if (webrtc->priv->pending_local_ice_candidates->len == 0) {
ICE_UNLOCK (webrtc);
GST_LOG_OBJECT (webrtc, "No ICE candidates to process right now");
return; /* Nothing to process */
}
/* Take the array so we can process it all and free it later
* without holding the lock
* FIXME: When we depend on GLib 2.64, we can use g_array_steal()
* here */
items = webrtc->priv->pending_local_ice_candidates;
/* Replace with a new array */
webrtc->priv->pending_local_ice_candidates =
g_array_new (FALSE, TRUE, sizeof (IceCandidateItem));
g_array_set_clear_func (webrtc->priv->pending_local_ice_candidates,
(GDestroyNotify) _clear_ice_candidate_item);
ICE_UNLOCK (webrtc);
for (i = 0; i < items->len; i++) {
IceCandidateItem *item = &g_array_index (items, IceCandidateItem, i);
const gchar *cand = item->candidate;
if (!g_ascii_strncasecmp (cand, "a=candidate:", 12)) {
/* stripping away "a=" */
cand += 2;
}
GST_TRACE_OBJECT (webrtc, "produced ICE candidate for mline:%u and %s",
item->mlineindex, cand);
/* First, merge this ice candidate into the appropriate mline
* in the local-description SDP.
* Second, emit the on-ice-candidate signal for the app.
*
* FIXME: This ICE candidate should be stored somewhere with
* the associated mid and also merged back into any subsequent
* local descriptions on renegotiation */
if (webrtc->current_local_description)
_add_ice_candidate_to_sdp (webrtc, webrtc->current_local_description->sdp,
item->mlineindex, cand);
if (webrtc->pending_local_description)
_add_ice_candidate_to_sdp (webrtc, webrtc->pending_local_description->sdp,
item->mlineindex, cand);
PC_UNLOCK (webrtc);
g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_ICE_CANDIDATE_SIGNAL],
0, item->mlineindex, cand);
PC_LOCK (webrtc);
}
g_array_free (items, TRUE);
}
static void
_on_local_ice_candidate_cb (GstWebRTCICE * ice, guint session_id,
gchar * candidate, GstWebRTCBin * webrtc)
{
IceCandidateItem item;
gboolean queue_task = FALSE;
item.mlineindex = session_id;
item.candidate = g_strdup (candidate);
ICE_LOCK (webrtc);
g_array_append_val (webrtc->priv->pending_local_ice_candidates, item);
/* Let the first pending candidate queue a task each time, which will
* handle any that arrive between now and when the task runs */
if (webrtc->priv->pending_local_ice_candidates->len == 1)
queue_task = TRUE;
ICE_UNLOCK (webrtc);
if (queue_task) {
GST_TRACE_OBJECT (webrtc, "Queueing on_ice_candidate_task");
gst_webrtc_bin_enqueue_task (webrtc,
(GstWebRTCBinFunc) _on_local_ice_candidate_task, NULL, NULL);
}
}
/* https://www.w3.org/TR/webrtc/#dfn-stats-selection-algorithm */
static GstStructure *
_get_stats_from_selector (GstWebRTCBin * webrtc, gpointer selector)
{
if (selector)
GST_FIXME_OBJECT (webrtc, "Implement stats selection");
return gst_structure_copy (webrtc->priv->stats);
}
struct get_stats
{
GstPad *pad;
GstPromise *promise;
};
static void
_free_get_stats (struct get_stats *stats)
{
if (stats->pad)
gst_object_unref (stats->pad);
if (stats->promise)
gst_promise_unref (stats->promise);
g_free (stats);
}
/* https://www.w3.org/TR/webrtc/#dom-rtcpeerconnection-getstats() */
static void
_get_stats_task (GstWebRTCBin * webrtc, struct get_stats *stats)
{
GstStructure *s;
gpointer selector = NULL;
gst_webrtc_bin_update_stats (webrtc);
if (stats->pad) {
GstWebRTCBinPad *wpad = GST_WEBRTC_BIN_PAD (stats->pad);
if (wpad->trans) {
if (GST_PAD_DIRECTION (wpad) == GST_PAD_SRC) {
selector = wpad->trans->receiver;
} else {
selector = wpad->trans->sender;
}
}
}
s = _get_stats_from_selector (webrtc, selector);
gst_promise_reply (stats->promise, s);
}
static void
gst_webrtc_bin_get_stats (GstWebRTCBin * webrtc, GstPad * pad,
GstPromise * promise)
{
struct get_stats *stats;
g_return_if_fail (promise != NULL);
g_return_if_fail (pad == NULL || GST_IS_WEBRTC_BIN_PAD (pad));
stats = g_new0 (struct get_stats, 1);
stats->promise = gst_promise_ref (promise);
/* FIXME: check that pad exists in element */
if (pad)
stats->pad = gst_object_ref (pad);
gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _get_stats_task,
stats, (GDestroyNotify) _free_get_stats);
}
static GstWebRTCRTPTransceiver *
gst_webrtc_bin_add_transceiver (GstWebRTCBin * webrtc,
GstWebRTCRTPTransceiverDirection direction, GstCaps * caps)
{
WebRTCTransceiver *trans;
GstWebRTCRTPTransceiver *rtp_trans;
g_return_val_if_fail (direction != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE,
NULL);
trans = _create_webrtc_transceiver (webrtc, direction, -1);
GST_LOG_OBJECT (webrtc,
"Created new unassociated transceiver %" GST_PTR_FORMAT, trans);
rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans);
if (caps)
rtp_trans->codec_preferences = gst_caps_ref (caps);
return gst_object_ref (trans);
}
static void
_deref_and_unref (GstObject ** object)
{
gst_clear_object (object);
}
static GArray *
gst_webrtc_bin_get_transceivers (GstWebRTCBin * webrtc)
{
GArray *arr = g_array_new (FALSE, TRUE, sizeof (GstWebRTCRTPTransceiver *));
int i;
g_array_set_clear_func (arr, (GDestroyNotify) _deref_and_unref);
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *trans =
g_ptr_array_index (webrtc->priv->transceivers, i);
gst_object_ref (trans);
g_array_append_val (arr, trans);
}
return arr;
}
static GstWebRTCRTPTransceiver *
gst_webrtc_bin_get_transceiver (GstWebRTCBin * webrtc, guint idx)
{
GstWebRTCRTPTransceiver *trans = NULL;
if (idx >= webrtc->priv->transceivers->len) {
GST_ERROR_OBJECT (webrtc, "No transceiver for idx %d", idx);
goto done;
}
trans = g_ptr_array_index (webrtc->priv->transceivers, idx);
gst_object_ref (trans);
done:
return trans;
}
static gboolean
gst_webrtc_bin_add_turn_server (GstWebRTCBin * webrtc, const gchar * uri)
{
g_return_val_if_fail (GST_IS_WEBRTC_BIN (webrtc), FALSE);
g_return_val_if_fail (uri != NULL, FALSE);
GST_DEBUG_OBJECT (webrtc, "Adding turn server: %s", uri);
return gst_webrtc_ice_add_turn_server (webrtc->priv->ice, uri);
}
static gboolean
copy_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstPad *gpad = GST_PAD_CAST (user_data);
GST_DEBUG_OBJECT (gpad, "store sticky event %" GST_PTR_FORMAT, *event);
gst_pad_store_sticky_event (gpad, *event);
return TRUE;
}
static GstWebRTCDataChannel *
gst_webrtc_bin_create_data_channel (GstWebRTCBin * webrtc, const gchar * label,
GstStructure * init_params)
{
gboolean ordered;
gint max_packet_lifetime;
gint max_retransmits;
const gchar *protocol;
gboolean negotiated;
gint id;
GstWebRTCPriorityType priority;
GstWebRTCDataChannel *ret;
gint max_channels = 65534;
g_return_val_if_fail (GST_IS_WEBRTC_BIN (webrtc), NULL);
g_return_val_if_fail (label != NULL, NULL);
g_return_val_if_fail (strlen (label) <= 65535, NULL);
g_return_val_if_fail (webrtc->priv->is_closed != TRUE, NULL);
if (!init_params
|| !gst_structure_get_boolean (init_params, "ordered", &ordered))
ordered = TRUE;
if (!init_params
|| !gst_structure_get_int (init_params, "max-packet-lifetime",
&max_packet_lifetime))
max_packet_lifetime = -1;
if (!init_params
|| !gst_structure_get_int (init_params, "max-retransmits",
&max_retransmits))
max_retransmits = -1;
/* both retransmits and lifetime cannot be set */
g_return_val_if_fail ((max_packet_lifetime == -1)
|| (max_retransmits == -1), NULL);
if (!init_params
|| !(protocol = gst_structure_get_string (init_params, "protocol")))
protocol = "";
g_return_val_if_fail (strlen (protocol) <= 65535, NULL);
if (!init_params
|| !gst_structure_get_boolean (init_params, "negotiated", &negotiated))
negotiated = FALSE;
if (!negotiated || !init_params
|| !gst_structure_get_int (init_params, "id", &id))
id = -1;
if (negotiated)
g_return_val_if_fail (id != -1, NULL);
g_return_val_if_fail (id < 65535, NULL);
if (!init_params
|| !gst_structure_get_enum (init_params, "priority",
GST_TYPE_WEBRTC_PRIORITY_TYPE, (gint *) & priority))
priority = GST_WEBRTC_PRIORITY_TYPE_LOW;
/* FIXME: clamp max-retransmits and max-packet-lifetime */
if (webrtc->priv->sctp_transport) {
/* Let transport be the connection's [[SctpTransport]] slot.
*
* If the [[DataChannelId]] slot is not null, transport is in
* connected state and [[DataChannelId]] is greater or equal to the
* transport's [[MaxChannels]] slot, throw an OperationError.
*/
g_object_get (webrtc->priv->sctp_transport, "max-channels", &max_channels,
NULL);
g_return_val_if_fail (id <= max_channels, NULL);
}
if (!_have_nice_elements (webrtc) || !_have_dtls_elements (webrtc) ||
!_have_sctp_elements (webrtc))
return NULL;
PC_LOCK (webrtc);
/* check if the id has been used already */
if (id != -1) {
GstWebRTCDataChannel *channel = _find_data_channel_for_id (webrtc, id);
if (channel) {
GST_ELEMENT_WARNING (webrtc, LIBRARY, SETTINGS,
("Attempting to add a data channel with a duplicate ID: %i", id),
NULL);
PC_UNLOCK (webrtc);
return NULL;
}
} else if (webrtc->current_local_description
&& webrtc->current_remote_description && webrtc->priv->sctp_transport
&& webrtc->priv->sctp_transport->transport) {
/* else we can only generate an id if we're configured already. The other
* case for generating an id is on sdp setting */
id = _generate_data_channel_id (webrtc);
if (id == -1) {
GST_ELEMENT_WARNING (webrtc, RESOURCE, NOT_FOUND,
("%s", "Failed to generate an identifier for a data channel"), NULL);
PC_UNLOCK (webrtc);
return NULL;
}
}
ret = g_object_new (GST_TYPE_WEBRTC_DATA_CHANNEL, "label", label,
"ordered", ordered, "max-packet-lifetime", max_packet_lifetime,
"max-retransmits", max_retransmits, "protocol", protocol,
"negotiated", negotiated, "id", id, "priority", priority, NULL);
if (ret) {
gst_bin_add (GST_BIN (webrtc), ret->appsrc);
gst_bin_add (GST_BIN (webrtc), ret->appsink);
gst_element_sync_state_with_parent (ret->appsrc);
gst_element_sync_state_with_parent (ret->appsink);
ret = gst_object_ref (ret);
ret->webrtcbin = webrtc;
g_ptr_array_add (webrtc->priv->data_channels, ret);
gst_webrtc_data_channel_link_to_sctp (ret, webrtc->priv->sctp_transport);
if (webrtc->priv->sctp_transport &&
webrtc->priv->sctp_transport->association_established
&& !ret->negotiated) {
gst_webrtc_data_channel_start_negotiation (ret);
} else {
_update_need_negotiation (webrtc);
}
}
PC_UNLOCK (webrtc);
return ret;
}
/* === rtpbin signal implementations === */
static void
on_rtpbin_pad_added (GstElement * rtpbin, GstPad * new_pad,
GstWebRTCBin * webrtc)
{
gchar *new_pad_name = NULL;
new_pad_name = gst_pad_get_name (new_pad);
GST_TRACE_OBJECT (webrtc, "new rtpbin pad %s", new_pad_name);
if (g_str_has_prefix (new_pad_name, "recv_rtp_src_")) {
guint32 session_id = 0, ssrc = 0, pt = 0;
GstWebRTCRTPTransceiver *rtp_trans;
WebRTCTransceiver *trans;
TransportStream *stream;
GstWebRTCBinPad *pad;
guint media_idx = 0;
gboolean found_ssrc = FALSE;
guint i;
if (sscanf (new_pad_name, "recv_rtp_src_%u_%u_%u", &session_id, &ssrc,
&pt) != 3) {
g_critical ("Invalid rtpbin pad name \'%s\'", new_pad_name);
return;
}
stream = _find_transport_for_session (webrtc, session_id);
if (!stream)
g_warn_if_reached ();
media_idx = session_id;
for (i = 0; i < stream->remote_ssrcmap->len; i++) {
SsrcMapItem *item =
&g_array_index (stream->remote_ssrcmap, SsrcMapItem, i);
if (item->ssrc == ssrc) {
media_idx = item->media_idx;
found_ssrc = TRUE;
break;
}
}
if (!found_ssrc) {
GST_WARNING_OBJECT (webrtc, "Could not find ssrc %u", ssrc);
}
rtp_trans = _find_transceiver_for_mline (webrtc, media_idx);
if (!rtp_trans)
g_warn_if_reached ();
trans = WEBRTC_TRANSCEIVER (rtp_trans);
g_assert (trans->stream == stream);
pad = _find_pad_for_transceiver (webrtc, GST_PAD_SRC, rtp_trans);
GST_TRACE_OBJECT (webrtc, "found pad %" GST_PTR_FORMAT
" for rtpbin pad name %s", pad, new_pad_name);
if (!pad)
g_warn_if_reached ();
gst_ghost_pad_set_target (GST_GHOST_PAD (pad), GST_PAD (new_pad));
if (webrtc->priv->running)
gst_pad_set_active (GST_PAD (pad), TRUE);
gst_pad_sticky_events_foreach (new_pad, copy_sticky_events, pad);
gst_element_add_pad (GST_ELEMENT (webrtc), GST_PAD (pad));
_remove_pending_pad (webrtc, pad);
gst_object_unref (pad);
}
g_free (new_pad_name);
}
/* only used for the receiving streams */
static GstCaps *
on_rtpbin_request_pt_map (GstElement * rtpbin, guint session_id, guint pt,
GstWebRTCBin * webrtc)
{
TransportStream *stream;
GstCaps *ret;
GST_DEBUG_OBJECT (webrtc, "getting pt map for pt %d in session %d", pt,
session_id);
stream = _find_transport_for_session (webrtc, session_id);
if (!stream)
goto unknown_session;
if ((ret = transport_stream_get_caps_for_pt (stream, pt)))
gst_caps_ref (ret);
GST_TRACE_OBJECT (webrtc, "Found caps %" GST_PTR_FORMAT " for pt %d in "
"session %d", ret, pt, session_id);
return ret;
unknown_session:
{
GST_DEBUG_OBJECT (webrtc, "unknown session %d", session_id);
return NULL;
}
}
static GstElement *
on_rtpbin_request_aux_sender (GstElement * rtpbin, guint session_id,
GstWebRTCBin * webrtc)
{
TransportStream *stream;
gboolean have_rtx = FALSE;
GstStructure *pt_map = NULL;
GstElement *ret = NULL;
GstWebRTCRTPTransceiver *trans;
stream = _find_transport_for_session (webrtc, session_id);
trans = _find_transceiver (webrtc, &session_id,
(FindTransceiverFunc) transceiver_match_for_mline);
if (stream)
have_rtx = transport_stream_get_pt (stream, "RTX") != 0;
GST_LOG_OBJECT (webrtc, "requesting aux sender for stream %" GST_PTR_FORMAT
" with transport %" GST_PTR_FORMAT " and pt map %" GST_PTR_FORMAT, stream,
trans, pt_map);
if (have_rtx) {
GstElement *rtx;
GstPad *pad;
gchar *name;
if (stream->rtxsend) {
GST_WARNING_OBJECT (webrtc, "rtprtxsend already created! rtpbin bug?!");
goto out;
}
GST_INFO ("creating AUX sender");
ret = gst_bin_new (NULL);
rtx = gst_element_factory_make ("rtprtxsend", NULL);
g_object_set (rtx, "max-size-packets", 500, NULL);
_set_rtx_ptmap_from_stream (webrtc, stream);
if (WEBRTC_TRANSCEIVER (trans)->local_rtx_ssrc_map)
g_object_set (rtx, "ssrc-map",
WEBRTC_TRANSCEIVER (trans)->local_rtx_ssrc_map, NULL);
gst_bin_add (GST_BIN (ret), rtx);
pad = gst_element_get_static_pad (rtx, "src");
name = g_strdup_printf ("src_%u", session_id);
gst_element_add_pad (ret, gst_ghost_pad_new (name, pad));
g_free (name);
gst_object_unref (pad);
pad = gst_element_get_static_pad (rtx, "sink");
name = g_strdup_printf ("sink_%u", session_id);
gst_element_add_pad (ret, gst_ghost_pad_new (name, pad));
g_free (name);
gst_object_unref (pad);
stream->rtxsend = gst_object_ref (rtx);
}
out:
if (pt_map)
gst_structure_free (pt_map);
return ret;
}
static GstElement *
on_rtpbin_request_aux_receiver (GstElement * rtpbin, guint session_id,
GstWebRTCBin * webrtc)
{
GstElement *ret = NULL;
GstElement *prev = NULL;
GstPad *sinkpad = NULL;
TransportStream *stream;
gint red_pt = 0;
gint rtx_pt = 0;
stream = _find_transport_for_session (webrtc, session_id);
if (stream) {
red_pt = transport_stream_get_pt (stream, "RED");
rtx_pt = transport_stream_get_pt (stream, "RTX");
}
GST_LOG_OBJECT (webrtc, "requesting aux receiver for stream %" GST_PTR_FORMAT,
stream);
if (red_pt || rtx_pt)
ret = gst_bin_new (NULL);
if (rtx_pt) {
if (stream->rtxreceive) {
GST_WARNING_OBJECT (webrtc,
"rtprtxreceive already created! rtpbin bug?!");
goto error;
}
stream->rtxreceive = gst_element_factory_make ("rtprtxreceive", NULL);
_set_rtx_ptmap_from_stream (webrtc, stream);
gst_bin_add (GST_BIN (ret), stream->rtxreceive);
sinkpad = gst_element_get_static_pad (stream->rtxreceive, "sink");
prev = gst_object_ref (stream->rtxreceive);
}
if (red_pt) {
GstElement *rtpreddec = gst_element_factory_make ("rtpreddec", NULL);
GST_DEBUG_OBJECT (webrtc, "Creating RED decoder for pt %d in session %u",
red_pt, session_id);
gst_bin_add (GST_BIN (ret), rtpreddec);
g_object_set (rtpreddec, "pt", red_pt, NULL);
if (prev)
gst_element_link (prev, rtpreddec);
else
sinkpad = gst_element_get_static_pad (rtpreddec, "sink");
prev = rtpreddec;
}
if (sinkpad) {
gchar *name = g_strdup_printf ("sink_%u", session_id);
GstPad *ghost = gst_ghost_pad_new (name, sinkpad);
g_free (name);
gst_object_unref (sinkpad);
gst_element_add_pad (ret, ghost);
}
if (prev) {
gchar *name = g_strdup_printf ("src_%u", session_id);
GstPad *srcpad = gst_element_get_static_pad (prev, "src");
GstPad *ghost = gst_ghost_pad_new (name, srcpad);
g_free (name);
gst_object_unref (srcpad);
gst_element_add_pad (ret, ghost);
}
out:
return ret;
error:
if (ret)
gst_object_unref (ret);
goto out;
}
static GstElement *
on_rtpbin_request_fec_decoder (GstElement * rtpbin, guint session_id,
GstWebRTCBin * webrtc)
{
TransportStream *stream;
GstElement *ret = NULL;
gint pt = 0;
GObject *internal_storage;
stream = _find_transport_for_session (webrtc, session_id);
/* TODO: for now, we only support ulpfec, but once we support
* more algorithms, if the remote may use more than one algorithm,
* we will want to do the following:
*
* + Return a bin here, with the relevant FEC decoders plugged in
* and their payload type set to 0
* + Enable the decoders by setting the payload type only when
* we detect it (by connecting to ptdemux:new-payload-type for
* example)
*/
if (stream)
pt = transport_stream_get_pt (stream, "ULPFEC");
if (pt) {
GST_DEBUG_OBJECT (webrtc, "Creating ULPFEC decoder for pt %d in session %u",
pt, session_id);
ret = gst_element_factory_make ("rtpulpfecdec", NULL);
g_signal_emit_by_name (webrtc->rtpbin, "get-internal-storage", session_id,
&internal_storage);
g_object_set (ret, "pt", pt, "storage", internal_storage, NULL);
g_object_unref (internal_storage);
}
return ret;
}
static GstElement *
on_rtpbin_request_fec_encoder (GstElement * rtpbin, guint session_id,
GstWebRTCBin * webrtc)
{
GstElement *ret = NULL;
GstElement *prev = NULL;
TransportStream *stream;
guint ulpfec_pt = 0;
guint red_pt = 0;
GstPad *sinkpad = NULL;
GstWebRTCRTPTransceiver *trans;
stream = _find_transport_for_session (webrtc, session_id);
trans = _find_transceiver (webrtc, &session_id,
(FindTransceiverFunc) transceiver_match_for_mline);
if (stream) {
ulpfec_pt = transport_stream_get_pt (stream, "ULPFEC");
red_pt = transport_stream_get_pt (stream, "RED");
}
if (ulpfec_pt || red_pt)
ret = gst_bin_new (NULL);
if (ulpfec_pt) {
GstElement *fecenc = gst_element_factory_make ("rtpulpfecenc", NULL);
GstCaps *caps = transport_stream_get_caps_for_pt (stream, ulpfec_pt);
GST_DEBUG_OBJECT (webrtc,
"Creating ULPFEC encoder for session %d with pt %d", session_id,
ulpfec_pt);
gst_bin_add (GST_BIN (ret), fecenc);
sinkpad = gst_element_get_static_pad (fecenc, "sink");
g_object_set (fecenc, "pt", ulpfec_pt, "percentage",
WEBRTC_TRANSCEIVER (trans)->fec_percentage, NULL);
if (caps && !gst_caps_is_empty (caps)) {
const GstStructure *s = gst_caps_get_structure (caps, 0);
const gchar *media = gst_structure_get_string (s, "media");
if (!g_strcmp0 (media, "video"))
g_object_set (fecenc, "multipacket", TRUE, NULL);
}
prev = fecenc;
}
if (red_pt) {
GstElement *redenc = gst_element_factory_make ("rtpredenc", NULL);
GST_DEBUG_OBJECT (webrtc, "Creating RED encoder for session %d with pt %d",
session_id, red_pt);
gst_bin_add (GST_BIN (ret), redenc);
if (prev)
gst_element_link (prev, redenc);
else
sinkpad = gst_element_get_static_pad (redenc, "sink");
g_object_set (redenc, "pt", red_pt, "allow-no-red-blocks", TRUE, NULL);
prev = redenc;
}
if (sinkpad) {
GstPad *ghost = gst_ghost_pad_new ("sink", sinkpad);
gst_object_unref (sinkpad);
gst_element_add_pad (ret, ghost);
}
if (prev) {
GstPad *srcpad = gst_element_get_static_pad (prev, "src");
GstPad *ghost = gst_ghost_pad_new ("src", srcpad);
gst_object_unref (srcpad);
gst_element_add_pad (ret, ghost);
}
return ret;
}
static void
on_rtpbin_bye_ssrc (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u received bye", session_id, ssrc);
}
static void
on_rtpbin_bye_timeout (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u bye timeout", session_id, ssrc);
}
static void
on_rtpbin_sender_timeout (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u sender timeout", session_id,
ssrc);
}
static void
on_rtpbin_new_ssrc (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u new ssrc", session_id, ssrc);
}
static void
on_rtpbin_ssrc_active (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u active", session_id, ssrc);
}
static void
on_rtpbin_ssrc_collision (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u collision", session_id, ssrc);
}
static void
on_rtpbin_ssrc_sdes (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u sdes", session_id, ssrc);
}
static void
on_rtpbin_ssrc_validated (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u validated", session_id, ssrc);
}
static void
on_rtpbin_timeout (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u timeout", session_id, ssrc);
}
static void
on_rtpbin_new_sender_ssrc (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u new sender ssrc", session_id,
ssrc);
}
static void
on_rtpbin_sender_ssrc_active (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
GST_INFO_OBJECT (webrtc, "session %u ssrc %u sender ssrc active", session_id,
ssrc);
}
static void
on_rtpbin_new_jitterbuffer (GstElement * rtpbin, GstElement * jitterbuffer,
guint session_id, guint ssrc, GstWebRTCBin * webrtc)
{
GstWebRTCRTPTransceiver *trans;
trans = _find_transceiver (webrtc, &session_id,
(FindTransceiverFunc) transceiver_match_for_mline);
if (trans) {
/* We don't set do-retransmission on rtpbin as we want per-session control */
g_object_set (jitterbuffer, "do-retransmission",
WEBRTC_TRANSCEIVER (trans)->do_nack, NULL);
} else {
g_assert_not_reached ();
}
}
static void
on_rtpbin_new_storage (GstElement * rtpbin, GstElement * storage,
guint session_id, GstWebRTCBin * webrtc)
{
/* TODO: when exposing latency, set size-time based on that */
g_object_set (storage, "size-time", (guint64) 250 * GST_MSECOND, NULL);
}
static GstElement *
_create_rtpbin (GstWebRTCBin * webrtc)
{
GstElement *rtpbin;
if (!(rtpbin = gst_element_factory_make ("rtpbin", "rtpbin")))
return NULL;
/* mandated by WebRTC */
gst_util_set_object_arg (G_OBJECT (rtpbin), "rtp-profile", "savpf");
g_object_set (rtpbin, "do-lost", TRUE, NULL);
g_signal_connect (rtpbin, "pad-added", G_CALLBACK (on_rtpbin_pad_added),
webrtc);
g_signal_connect (rtpbin, "request-pt-map",
G_CALLBACK (on_rtpbin_request_pt_map), webrtc);
g_signal_connect (rtpbin, "request-aux-sender",
G_CALLBACK (on_rtpbin_request_aux_sender), webrtc);
g_signal_connect (rtpbin, "request-aux-receiver",
G_CALLBACK (on_rtpbin_request_aux_receiver), webrtc);
g_signal_connect (rtpbin, "new-storage",
G_CALLBACK (on_rtpbin_new_storage), webrtc);
g_signal_connect (rtpbin, "request-fec-decoder",
G_CALLBACK (on_rtpbin_request_fec_decoder), webrtc);
g_signal_connect (rtpbin, "request-fec-encoder",
G_CALLBACK (on_rtpbin_request_fec_encoder), webrtc);
g_signal_connect (rtpbin, "on-bye-ssrc",
G_CALLBACK (on_rtpbin_bye_ssrc), webrtc);
g_signal_connect (rtpbin, "on-bye-timeout",
G_CALLBACK (on_rtpbin_bye_timeout), webrtc);
g_signal_connect (rtpbin, "on-new-ssrc",
G_CALLBACK (on_rtpbin_new_ssrc), webrtc);
g_signal_connect (rtpbin, "on-new-sender-ssrc",
G_CALLBACK (on_rtpbin_new_sender_ssrc), webrtc);
g_signal_connect (rtpbin, "on-sender-ssrc-active",
G_CALLBACK (on_rtpbin_sender_ssrc_active), webrtc);
g_signal_connect (rtpbin, "on-sender-timeout",
G_CALLBACK (on_rtpbin_sender_timeout), webrtc);
g_signal_connect (rtpbin, "on-ssrc-active",
G_CALLBACK (on_rtpbin_ssrc_active), webrtc);
g_signal_connect (rtpbin, "on-ssrc-collision",
G_CALLBACK (on_rtpbin_ssrc_collision), webrtc);
g_signal_connect (rtpbin, "on-ssrc-sdes",
G_CALLBACK (on_rtpbin_ssrc_sdes), webrtc);
g_signal_connect (rtpbin, "on-ssrc-validated",
G_CALLBACK (on_rtpbin_ssrc_validated), webrtc);
g_signal_connect (rtpbin, "on-timeout",
G_CALLBACK (on_rtpbin_timeout), webrtc);
g_signal_connect (rtpbin, "new-jitterbuffer",
G_CALLBACK (on_rtpbin_new_jitterbuffer), webrtc);
return rtpbin;
}
static GstStateChangeReturn
gst_webrtc_bin_change_state (GstElement * element, GstStateChange transition)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GST_DEBUG ("changing state: %s => %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:{
if (!_have_nice_elements (webrtc) || !_have_dtls_elements (webrtc))
return GST_STATE_CHANGE_FAILURE;
_start_thread (webrtc);
PC_LOCK (webrtc);
_update_need_negotiation (webrtc);
PC_UNLOCK (webrtc);
break;
}
case GST_STATE_CHANGE_READY_TO_PAUSED:
webrtc->priv->running = TRUE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* Mangle the return value to NO_PREROLL as that's what really is
* occurring here however cannot be propagated correctly due to nicesrc
* requiring that it be in PLAYING already in order to send/receive
* correctly :/ */
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
webrtc->priv->running = FALSE;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
_stop_thread (webrtc);
break;
default:
break;
}
return ret;
}
static GstPadProbeReturn
sink_pad_block (GstPad * pad, GstPadProbeInfo * info, gpointer unused)
{
GST_LOG_OBJECT (pad, "blocking pad with data %" GST_PTR_FORMAT, info->data);
return GST_PAD_PROBE_OK;
}
static GstPad *
gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
const gchar * name, const GstCaps * caps)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (element);
GstWebRTCBinPad *pad = NULL;
guint serial;
if (!_have_nice_elements (webrtc) || !_have_dtls_elements (webrtc))
return NULL;
if (templ->direction == GST_PAD_SINK ||
g_strcmp0 (templ->name_template, "sink_%u") == 0) {
GstWebRTCRTPTransceiver *trans;
GST_OBJECT_LOCK (webrtc);
if (name == NULL || strlen (name) < 6 || !g_str_has_prefix (name, "sink_")) {
/* no name given when requesting the pad, use next available int */
serial = webrtc->priv->max_sink_pad_serial++;
} else {
/* parse serial number from requested padname */
serial = g_ascii_strtoull (&name[5], NULL, 10);
if (serial > webrtc->priv->max_sink_pad_serial)
webrtc->priv->max_sink_pad_serial = serial;
}
GST_OBJECT_UNLOCK (webrtc);
pad = _create_pad_for_sdp_media (webrtc, GST_PAD_SINK, serial);
trans = _find_transceiver_for_mline (webrtc, serial);
if (!trans) {
trans =
GST_WEBRTC_RTP_TRANSCEIVER (_create_webrtc_transceiver (webrtc,
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV, serial));
GST_LOG_OBJECT (webrtc, "Created new transceiver %" GST_PTR_FORMAT
" for mline %u", trans, serial);
}
pad->trans = gst_object_ref (trans);
pad->block_id = gst_pad_add_probe (GST_PAD (pad), GST_PAD_PROBE_TYPE_BLOCK |
GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST,
(GstPadProbeCallback) sink_pad_block, NULL, NULL);
webrtc->priv->pending_sink_transceivers =
g_list_append (webrtc->priv->pending_sink_transceivers,
gst_object_ref (pad));
_add_pad (webrtc, pad);
}
return GST_PAD (pad);
}
static void
gst_webrtc_bin_release_pad (GstElement * element, GstPad * pad)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (element);
GstWebRTCBinPad *webrtc_pad = GST_WEBRTC_BIN_PAD (pad);
if (webrtc_pad->trans)
gst_object_unref (webrtc_pad->trans);
webrtc_pad->trans = NULL;
_remove_pad (webrtc, webrtc_pad);
PC_LOCK (webrtc);
_update_need_negotiation (webrtc);
PC_UNLOCK (webrtc);
}
static void
gst_webrtc_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object);
switch (prop_id) {
case PROP_STUN_SERVER:
case PROP_TURN_SERVER:
g_object_set_property (G_OBJECT (webrtc->priv->ice), pspec->name, value);
break;
case PROP_BUNDLE_POLICY:
if (g_value_get_enum (value) == GST_WEBRTC_BUNDLE_POLICY_BALANCED) {
GST_ERROR_OBJECT (object, "Balanced bundle policy not implemented yet");
} else {
webrtc->bundle_policy = g_value_get_enum (value);
}
break;
case PROP_ICE_TRANSPORT_POLICY:
webrtc->ice_transport_policy = g_value_get_enum (value);
g_object_set (webrtc->priv->ice, "force-relay",
webrtc->ice_transport_policy ==
GST_WEBRTC_ICE_TRANSPORT_POLICY_RELAY ? TRUE : FALSE, NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_webrtc_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object);
PC_LOCK (webrtc);
switch (prop_id) {
case PROP_CONNECTION_STATE:
g_value_set_enum (value, webrtc->peer_connection_state);
break;
case PROP_SIGNALING_STATE:
g_value_set_enum (value, webrtc->signaling_state);
break;
case PROP_ICE_GATHERING_STATE:
g_value_set_enum (value, webrtc->ice_gathering_state);
break;
case PROP_ICE_CONNECTION_STATE:
g_value_set_enum (value, webrtc->ice_connection_state);
break;
case PROP_LOCAL_DESCRIPTION:
if (webrtc->pending_local_description)
g_value_set_boxed (value, webrtc->pending_local_description);
else if (webrtc->current_local_description)
g_value_set_boxed (value, webrtc->current_local_description);
else
g_value_set_boxed (value, NULL);
break;
case PROP_CURRENT_LOCAL_DESCRIPTION:
g_value_set_boxed (value, webrtc->current_local_description);
break;
case PROP_PENDING_LOCAL_DESCRIPTION:
g_value_set_boxed (value, webrtc->pending_local_description);
break;
case PROP_REMOTE_DESCRIPTION:
if (webrtc->pending_remote_description)
g_value_set_boxed (value, webrtc->pending_remote_description);
else if (webrtc->current_remote_description)
g_value_set_boxed (value, webrtc->current_remote_description);
else
g_value_set_boxed (value, NULL);
break;
case PROP_CURRENT_REMOTE_DESCRIPTION:
g_value_set_boxed (value, webrtc->current_remote_description);
break;
case PROP_PENDING_REMOTE_DESCRIPTION:
g_value_set_boxed (value, webrtc->pending_remote_description);
break;
case PROP_STUN_SERVER:
case PROP_TURN_SERVER:
g_object_get_property (G_OBJECT (webrtc->priv->ice), pspec->name, value);
break;
case PROP_BUNDLE_POLICY:
g_value_set_enum (value, webrtc->bundle_policy);
break;
case PROP_ICE_TRANSPORT_POLICY:
g_value_set_enum (value, webrtc->ice_transport_policy);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
PC_UNLOCK (webrtc);
}
static void
_free_pending_pad (GstPad * pad)
{
gst_object_unref (pad);
}
static void
gst_webrtc_bin_dispose (GObject * object)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object);
if (webrtc->priv->ice)
gst_object_unref (webrtc->priv->ice);
webrtc->priv->ice = NULL;
if (webrtc->priv->ice_stream_map)
g_array_free (webrtc->priv->ice_stream_map, TRUE);
webrtc->priv->ice_stream_map = NULL;
g_clear_object (&webrtc->priv->sctp_transport);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_webrtc_bin_finalize (GObject * object)
{
GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object);
if (webrtc->priv->transports)
g_ptr_array_free (webrtc->priv->transports, TRUE);
webrtc->priv->transports = NULL;
if (webrtc->priv->transceivers)
g_ptr_array_free (webrtc->priv->transceivers, TRUE);
webrtc->priv->transceivers = NULL;
if (webrtc->priv->data_channels)
g_ptr_array_free (webrtc->priv->data_channels, TRUE);
webrtc->priv->data_channels = NULL;
if (webrtc->priv->pending_data_channels)
g_ptr_array_free (webrtc->priv->pending_data_channels, TRUE);
webrtc->priv->pending_data_channels = NULL;
if (webrtc->priv->pending_remote_ice_candidates)
g_array_free (webrtc->priv->pending_remote_ice_candidates, TRUE);
webrtc->priv->pending_remote_ice_candidates = NULL;
if (webrtc->priv->pending_local_ice_candidates)
g_array_free (webrtc->priv->pending_local_ice_candidates, TRUE);
webrtc->priv->pending_local_ice_candidates = NULL;
if (webrtc->priv->session_mid_map)
g_array_free (webrtc->priv->session_mid_map, TRUE);
webrtc->priv->session_mid_map = NULL;
if (webrtc->priv->pending_pads)
g_list_free_full (webrtc->priv->pending_pads,
(GDestroyNotify) _free_pending_pad);
webrtc->priv->pending_pads = NULL;
if (webrtc->priv->pending_sink_transceivers)
g_list_free_full (webrtc->priv->pending_sink_transceivers,
(GDestroyNotify) gst_object_unref);
webrtc->priv->pending_sink_transceivers = NULL;
if (webrtc->current_local_description)
gst_webrtc_session_description_free (webrtc->current_local_description);
webrtc->current_local_description = NULL;
if (webrtc->pending_local_description)
gst_webrtc_session_description_free (webrtc->pending_local_description);
webrtc->pending_local_description = NULL;
if (webrtc->current_remote_description)
gst_webrtc_session_description_free (webrtc->current_remote_description);
webrtc->current_remote_description = NULL;
if (webrtc->pending_remote_description)
gst_webrtc_session_description_free (webrtc->pending_remote_description);
webrtc->pending_remote_description = NULL;
if (webrtc->priv->last_generated_answer)
gst_webrtc_session_description_free (webrtc->priv->last_generated_answer);
webrtc->priv->last_generated_answer = NULL;
if (webrtc->priv->last_generated_offer)
gst_webrtc_session_description_free (webrtc->priv->last_generated_offer);
webrtc->priv->last_generated_offer = NULL;
if (webrtc->priv->stats)
gst_structure_free (webrtc->priv->stats);
webrtc->priv->stats = NULL;
g_mutex_clear (ICE_GET_LOCK (webrtc));
g_mutex_clear (PC_GET_LOCK (webrtc));
g_cond_clear (PC_GET_COND (webrtc));
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_webrtc_bin_class_init (GstWebRTCBinClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
element_class->request_new_pad = gst_webrtc_bin_request_new_pad;
element_class->release_pad = gst_webrtc_bin_release_pad;
element_class->change_state = gst_webrtc_bin_change_state;
gst_element_class_add_static_pad_template_with_gtype (element_class,
&sink_template, GST_TYPE_WEBRTC_BIN_PAD);
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_set_metadata (element_class, "WebRTC Bin",
"Filter/Network/WebRTC", "A bin for webrtc connections",
"Matthew Waters <matthew@centricular.com>");
gobject_class->get_property = gst_webrtc_bin_get_property;
gobject_class->set_property = gst_webrtc_bin_set_property;
gobject_class->dispose = gst_webrtc_bin_dispose;
gobject_class->finalize = gst_webrtc_bin_finalize;
g_object_class_install_property (gobject_class,
PROP_LOCAL_DESCRIPTION,
g_param_spec_boxed ("local-description", "Local Description",
"The local SDP description in use for this connection. "
"Favours a pending description over the current description",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_CURRENT_LOCAL_DESCRIPTION,
g_param_spec_boxed ("current-local-description",
"Current Local Description",
"The local description that was successfully negotiated the last time "
"the connection transitioned into the stable state",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PENDING_LOCAL_DESCRIPTION,
g_param_spec_boxed ("pending-local-description",
"Pending Local Description",
"The local description that is in the process of being negotiated plus "
"any local candidates that have been generated by the ICE Agent since the "
"offer or answer was created",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_REMOTE_DESCRIPTION,
g_param_spec_boxed ("remote-description", "Remote Description",
"The remote SDP description to use for this connection. "
"Favours a pending description over the current description",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_CURRENT_REMOTE_DESCRIPTION,
g_param_spec_boxed ("current-remote-description",
"Current Remote Description",
"The last remote description that was successfully negotiated the last "
"time the connection transitioned into the stable state plus any remote "
"candidates that have been supplied via addIceCandidate() since the offer "
"or answer was created",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_PENDING_REMOTE_DESCRIPTION,
g_param_spec_boxed ("pending-remote-description",
"Pending Remote Description",
"The remote description that is in the process of being negotiated, "
"complete with any remote candidates that have been supplied via "
"addIceCandidate() since the offer or answer was created",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_STUN_SERVER,
g_param_spec_string ("stun-server", "STUN Server",
"The STUN server of the form stun://hostname:port",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_TURN_SERVER,
g_param_spec_string ("turn-server", "TURN Server",
"The TURN server of the form turn(s)://username:password@host:port. "
"This is a convenience property, use #GstWebRTCBin::add-turn-server "
"if you wish to use multiple TURN servers",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_CONNECTION_STATE,
g_param_spec_enum ("connection-state", "Connection State",
"The overall connection state of this element",
GST_TYPE_WEBRTC_PEER_CONNECTION_STATE,
GST_WEBRTC_PEER_CONNECTION_STATE_NEW,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_SIGNALING_STATE,
g_param_spec_enum ("signaling-state", "Signaling State",
"The signaling state of this element",
GST_TYPE_WEBRTC_SIGNALING_STATE,
GST_WEBRTC_SIGNALING_STATE_STABLE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ICE_CONNECTION_STATE,
g_param_spec_enum ("ice-connection-state", "ICE connection state",
"The collective connection state of all ICETransport's",
GST_TYPE_WEBRTC_ICE_CONNECTION_STATE,
GST_WEBRTC_ICE_CONNECTION_STATE_NEW,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ICE_GATHERING_STATE,
g_param_spec_enum ("ice-gathering-state", "ICE gathering state",
"The collective gathering state of all ICETransport's",
GST_TYPE_WEBRTC_ICE_GATHERING_STATE,
GST_WEBRTC_ICE_GATHERING_STATE_NEW,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_BUNDLE_POLICY,
g_param_spec_enum ("bundle-policy", "Bundle Policy",
"The policy to apply for bundling",
GST_TYPE_WEBRTC_BUNDLE_POLICY,
GST_WEBRTC_BUNDLE_POLICY_NONE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_ICE_TRANSPORT_POLICY,
g_param_spec_enum ("ice-transport-policy", "ICE Transport Policy",
"The policy to apply for ICE transport",
GST_TYPE_WEBRTC_ICE_TRANSPORT_POLICY,
GST_WEBRTC_ICE_TRANSPORT_POLICY_ALL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstWebRTCBin::create-offer:
* @object: the #webrtcbin
* @options: (nullable): create-offer options
* @promise: a #GstPromise which will contain the offer
*/
gst_webrtc_bin_signals[CREATE_OFFER_SIGNAL] =
g_signal_new_class_handler ("create-offer", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_create_offer), NULL, NULL, NULL,
G_TYPE_NONE, 2, GST_TYPE_STRUCTURE, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::create-answer:
* @object: the #webrtcbin
* @options: (nullable): create-answer options
* @promise: a #GstPromise which will contain the answer
*/
gst_webrtc_bin_signals[CREATE_ANSWER_SIGNAL] =
g_signal_new_class_handler ("create-answer", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_create_answer), NULL, NULL, NULL,
G_TYPE_NONE, 2, GST_TYPE_STRUCTURE, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::set-local-description:
* @object: the #GstWebRTCBin
* @desc: a #GstWebRTCSessionDescription description
* @promise: (nullable): a #GstPromise to be notified when it's set
*/
gst_webrtc_bin_signals[SET_LOCAL_DESCRIPTION_SIGNAL] =
g_signal_new_class_handler ("set-local-description",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_set_local_description), NULL, NULL, NULL,
G_TYPE_NONE, 2, GST_TYPE_WEBRTC_SESSION_DESCRIPTION, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::set-remote-description:
* @object: the #GstWebRTCBin
* @desc: a #GstWebRTCSessionDescription description
* @promise: (nullable): a #GstPromise to be notified when it's set
*/
gst_webrtc_bin_signals[SET_REMOTE_DESCRIPTION_SIGNAL] =
g_signal_new_class_handler ("set-remote-description",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_set_remote_description), NULL, NULL, NULL,
G_TYPE_NONE, 2, GST_TYPE_WEBRTC_SESSION_DESCRIPTION, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::add-ice-candidate:
* @object: the #webrtcbin
* @mline_index: the index of the media description in the SDP
* @ice-candidate: an ice candidate
*/
gst_webrtc_bin_signals[ADD_ICE_CANDIDATE_SIGNAL] =
g_signal_new_class_handler ("add-ice-candidate",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_add_ice_candidate), NULL, NULL, NULL,
G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING);
/**
* GstWebRTCBin::get-stats:
* @object: the #webrtcbin
* @pad: (nullable): A #GstPad to get the stats for, or %NULL for all
* @promise: a #GstPromise for the result
*
* The @promise will contain the result of retrieving the session statistics.
* The structure will be named 'application/x-webrtc-stats and contain the
* following based on the webrtc-stats spec available from
* https://www.w3.org/TR/webrtc-stats/. As the webrtc-stats spec is a draft
* and is constantly changing these statistics may be changed to fit with
* the latest spec.
*
* Each field key is a unique identifier for each RTCStats
* (https://www.w3.org/TR/webrtc/#rtcstats-dictionary) value (another
* GstStructure) in the RTCStatsReport
* (https://www.w3.org/TR/webrtc/#rtcstatsreport-object). Each supported
* field in the RTCStats subclass is outlined below.
*
* Each statistics structure contains the following values as defined by
* the RTCStats dictionary (https://www.w3.org/TR/webrtc/#rtcstats-dictionary).
*
* "timestamp" G_TYPE_DOUBLE timestamp the statistics were generated
* "type" GST_TYPE_WEBRTC_STATS_TYPE the type of statistics reported
* "id" G_TYPE_STRING unique identifier
*
* RTCCodecStats supported fields (https://w3c.github.io/webrtc-stats/#codec-dict*)
*
* "payload-type" G_TYPE_UINT the rtp payload number in use
* "clock-rate" G_TYPE_UINT the rtp clock-rate
*
* RTCRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#streamstats-dict*)
*
* "ssrc" G_TYPE_STRING the rtp sequence src in use
* "transport-id" G_TYPE_STRING identifier for the associated RTCTransportStats for this stream
* "codec-id" G_TYPE_STRING identifier for the associated RTCCodecStats for this stream
* "fir-count" G_TYPE_UINT FIR requests received by the sender (only for local statistics)
* "pli-count" G_TYPE_UINT PLI requests received by the sender (only for local statistics)
* "nack-count" G_TYPE_UINT NACK requests received by the sender (only for local statistics)
*
* RTCReceivedStreamStats supported fields (https://w3c.github.io/webrtc-stats/#receivedrtpstats-dict*)
*
* "packets-received" G_TYPE_UINT64 number of packets received (only for local inbound)
* "bytes-received" G_TYPE_UINT64 number of bytes received (only for local inbound)
* "packets-lost" G_TYPE_UINT number of packets lost
* "jitter" G_TYPE_DOUBLE packet jitter measured in secondss
*
* RTCInboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#inboundrtpstats-dict*)
*
* "remote-id" G_TYPE_STRING identifier for the associated RTCRemoteOutboundRTPStreamStats
*
* RTCRemoteInboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#remoteinboundrtpstats-dict*)
*
* "local-id" G_TYPE_STRING identifier for the associated RTCOutboundRTPSTreamStats
* "round-trip-time" G_TYPE_DOUBLE round trip time of packets measured in seconds
*
* RTCSentRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#sentrtpstats-dict*)
*
* "packets-sent" G_TYPE_UINT64 number of packets sent (only for local outbound)
* "bytes-sent" G_TYPE_UINT64 number of packets sent (only for local outbound)
*
* RTCOutboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#outboundrtpstats-dict*)
*
* "remote-id" G_TYPE_STRING identifier for the associated RTCRemoteInboundRTPSTreamStats
*
* RTCRemoteOutboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#remoteoutboundrtpstats-dict*)
*
* "local-id" G_TYPE_STRING identifier for the associated RTCInboundRTPSTreamStats
*
*/
gst_webrtc_bin_signals[GET_STATS_SIGNAL] =
g_signal_new_class_handler ("get-stats",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_get_stats), NULL, NULL, NULL,
G_TYPE_NONE, 2, GST_TYPE_PAD, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::on-negotiation-needed:
* @object: the #webrtcbin
*/
gst_webrtc_bin_signals[ON_NEGOTIATION_NEEDED_SIGNAL] =
g_signal_new ("on-negotiation-needed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 0);
/**
* GstWebRTCBin::on-ice-candidate:
* @object: the #webrtcbin
* @mline_index: the index of the media description in the SDP
* @candidate: the ICE candidate
*/
gst_webrtc_bin_signals[ON_ICE_CANDIDATE_SIGNAL] =
g_signal_new ("on-ice-candidate", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING);
/**
* GstWebRTCBin::on-new-transceiver:
* @object: the #webrtcbin
* @candidate: the new #GstWebRTCRTPTransceiver
*/
gst_webrtc_bin_signals[ON_NEW_TRANSCEIVER_SIGNAL] =
g_signal_new ("on-new-transceiver", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 1, GST_TYPE_WEBRTC_RTP_TRANSCEIVER);
/**
* GstWebRTCBin::on-data-channel:
* @object: the #GstWebRTCBin
* @candidate: the new `GstWebRTCDataChannel`
*/
gst_webrtc_bin_signals[ON_DATA_CHANNEL_SIGNAL] =
g_signal_new ("on-data-channel", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 1, GST_TYPE_WEBRTC_DATA_CHANNEL);
/**
* GstWebRTCBin::add-transceiver:
* @object: the #webrtcbin
* @direction: the direction of the new transceiver
* @caps: (allow none): the codec preferences for this transceiver
*
* Returns: the new #GstWebRTCRTPTransceiver
*/
gst_webrtc_bin_signals[ADD_TRANSCEIVER_SIGNAL] =
g_signal_new_class_handler ("add-transceiver", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_add_transceiver), NULL, NULL,
NULL, GST_TYPE_WEBRTC_RTP_TRANSCEIVER, 2,
GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, GST_TYPE_CAPS);
/**
* GstWebRTCBin::get-transceivers:
* @object: the #webrtcbin
*
* Returns: a #GArray of #GstWebRTCRTPTransceivers
*/
gst_webrtc_bin_signals[GET_TRANSCEIVERS_SIGNAL] =
g_signal_new_class_handler ("get-transceivers", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_get_transceivers), NULL, NULL, NULL,
G_TYPE_ARRAY, 0);
/**
* GstWebRTCBin::get-transceiver:
* @object: the #GstWebRTCBin
* @idx: The index of the transceiver
*
* Returns: (transfer full): the #GstWebRTCRTPTransceiver, or %NULL
* Since: 1.16
*/
gst_webrtc_bin_signals[GET_TRANSCEIVER_SIGNAL] =
g_signal_new_class_handler ("get-transceiver", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_get_transceiver), NULL, NULL, NULL,
GST_TYPE_WEBRTC_RTP_TRANSCEIVER, 1, G_TYPE_INT);
/**
* GstWebRTCBin::add-turn-server:
* @object: the #GstWebRTCBin
* @uri: The uri of the server of the form turn(s)://username:password@host:port
*
* Add a turn server to obtain ICE candidates from
*/
gst_webrtc_bin_signals[ADD_TURN_SERVER_SIGNAL] =
g_signal_new_class_handler ("add-turn-server", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_add_turn_server), NULL, NULL, NULL,
G_TYPE_BOOLEAN, 1, G_TYPE_STRING);
/*
* GstWebRTCBin::create-data-channel:
* @object: the #GstWebRTCBin
* @label: the label for the data channel
* @options: a #GstStructure of options for creating the data channel
*
* The options dictionary is the same format as the RTCDataChannelInit
* members outlined https://www.w3.org/TR/webrtc/#dom-rtcdatachannelinit and
* and reproduced below
*
* ordered G_TYPE_BOOLEAN Whether the channal will send data with guaranteed ordering
* max-packet-lifetime G_TYPE_INT The time in milliseconds to attempt transmitting unacknowledged data. -1 for unset
* max-retransmits G_TYPE_INT The number of times data will be attempted to be transmitted without acknowledgement before dropping
* protocol G_TYPE_STRING The subprotocol used by this channel
* negotiated G_TYPE_BOOLEAN Whether the created data channel should not perform in-band chnanel announcement. If %TRUE, then application must negotiate the channel itself and create the corresponding channel on the peer with the same id.
* id G_TYPE_INT Override the default identifier selection of this channel
* priority GST_TYPE_WEBRTC_PRIORITY_TYPE The priority to use for this channel
*
* Returns: (transfer full): a new data channel object
*/
gst_webrtc_bin_signals[CREATE_DATA_CHANNEL_SIGNAL] =
g_signal_new_class_handler ("create-data-channel",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_webrtc_bin_create_data_channel), NULL, NULL,
NULL, GST_TYPE_WEBRTC_DATA_CHANNEL, 2, G_TYPE_STRING, GST_TYPE_STRUCTURE);
}
static void
_unparent_and_unref (GObject * object)
{
GstObject *obj = GST_OBJECT (object);
GST_OBJECT_PARENT (obj) = NULL;
gst_object_unref (obj);
}
static void
_transport_free (GObject * object)
{
TransportStream *stream = (TransportStream *) object;
GstWebRTCBin *webrtc;
webrtc = GST_WEBRTC_BIN (GST_OBJECT_PARENT (stream));
if (stream->transport) {
g_signal_handlers_disconnect_by_data (stream->transport->transport, webrtc);
g_signal_handlers_disconnect_by_data (stream->transport, webrtc);
}
if (stream->rtcp_transport) {
g_signal_handlers_disconnect_by_data (stream->rtcp_transport->transport,
webrtc);
g_signal_handlers_disconnect_by_data (stream->rtcp_transport, webrtc);
}
gst_object_unref (object);
}
static void
gst_webrtc_bin_init (GstWebRTCBin * webrtc)
{
webrtc->priv = gst_webrtc_bin_get_instance_private (webrtc);
g_mutex_init (PC_GET_LOCK (webrtc));
g_cond_init (PC_GET_COND (webrtc));
g_mutex_init (ICE_GET_LOCK (webrtc));
webrtc->rtpbin = _create_rtpbin (webrtc);
gst_bin_add (GST_BIN (webrtc), webrtc->rtpbin);
webrtc->priv->transceivers =
g_ptr_array_new_with_free_func ((GDestroyNotify) _unparent_and_unref);
webrtc->priv->transports =
g_ptr_array_new_with_free_func ((GDestroyNotify) _transport_free);
webrtc->priv->data_channels =
g_ptr_array_new_with_free_func ((GDestroyNotify) gst_object_unref);
webrtc->priv->pending_data_channels =
g_ptr_array_new_with_free_func ((GDestroyNotify) gst_object_unref);
webrtc->priv->session_mid_map =
g_array_new (FALSE, TRUE, sizeof (SessionMidItem));
g_array_set_clear_func (webrtc->priv->session_mid_map,
(GDestroyNotify) clear_session_mid_item);
webrtc->priv->ice = gst_webrtc_ice_new ();
g_signal_connect (webrtc->priv->ice, "on-ice-candidate",
G_CALLBACK (_on_local_ice_candidate_cb), webrtc);
webrtc->priv->ice_stream_map =
g_array_new (FALSE, TRUE, sizeof (IceStreamItem));
webrtc->priv->pending_remote_ice_candidates =
g_array_new (FALSE, TRUE, sizeof (IceCandidateItem));
g_array_set_clear_func (webrtc->priv->pending_remote_ice_candidates,
(GDestroyNotify) _clear_ice_candidate_item);
webrtc->priv->pending_local_ice_candidates =
g_array_new (FALSE, TRUE, sizeof (IceCandidateItem));
g_array_set_clear_func (webrtc->priv->pending_local_ice_candidates,
(GDestroyNotify) _clear_ice_candidate_item);
/* we start off closed until we move to READY */
webrtc->priv->is_closed = TRUE;
}
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