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gstreamer/ext/webrtc/gstwebrtcbin.c
Matthew Waters 2a1176973a webrtc: fix rtx + bundle 
If bundle was used in combination with rtx, only the bundled transport
stream would have correctly configured rtx parameters.

Iterate over the payloads upfront in the bundled case to ensure the
correct payload mapping is set for the RTX elements.
2019-02-15 08:19:51 +00:00

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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)))
/*
* 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
*
* seperate 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);
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)
{
switch (prop_id) {
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;
}
static gboolean
gst_webrtcbin_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstWebRTCBinPad *wpad = GST_WEBRTC_BIN_PAD (pad);
if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) {
GstCaps *caps;
gboolean do_update;
gst_event_parse_caps (event, &caps);
do_update = (!wpad->received_caps
|| gst_caps_is_equal (wpad->received_caps, caps));
gst_caps_replace (&wpad->received_caps, caps);
if (do_update)
_update_need_negotiation (GST_WEBRTC_BIN (parent));
}
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_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_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
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_array_index (webrtc->priv->transports, TransportStream *,
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_array_index (webrtc->priv->data_channels, GstWebRTCDataChannel *,
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_closed = TRUE;
int i;
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *rtp_trans =
g_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
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)
continue;
if (!rtp_trans->mid)
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);
any_state |= (1 << ice_state);
if (ice_state != STATE (CLOSED))
all_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);
any_state |= (1 << ice_state);
if (ice_state != STATE (CLOSED))
all_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 RTCIceTransport s are in the failed state. */
if (any_state & (1 << STATE (FAILED))) {
GST_TRACE_OBJECT (webrtc, "returning failed");
return STATE (FAILED);
}
/* Any of the RTCIceTransport s are in the disconnected state and
* none of them are in the failed state. */
if (any_state & (1 << STATE (DISCONNECTED))) {
GST_TRACE_OBJECT (webrtc, "returning disconnected");
return STATE (DISCONNECTED);
}
/* Any of the RTCIceTransport's are in the checking state and none of them
* are in the failed or disconnected state. */
if (any_state & (1 << STATE (CHECKING))) {
GST_TRACE_OBJECT (webrtc, "returning checking");
return STATE (CHECKING);
}
/* Any of the RTCIceTransport s are in the new state and none of them are
* in the checking, failed or disconnected state, or all RTCIceTransport's
* are in the closed state. */
if ((any_state & (1 << STATE (NEW))) || all_closed) {
GST_TRACE_OBJECT (webrtc, "returning new");
return STATE (NEW);
}
/* All RTCIceTransport s are in the connected, completed or closed state
* and at least one of them is in the connected state. */
if (any_state & (1 << STATE (CONNECTED) | 1 << STATE (COMPLETED) | 1 <<
STATE (CLOSED)) && any_state & (1 << STATE (CONNECTED))) {
GST_TRACE_OBJECT (webrtc, "returning connected");
return STATE (CONNECTED);
}
/* All RTCIceTransport s are in the completed or closed state and at least
* one of them is in the completed state. */
if (any_state & (1 << STATE (COMPLETED) | 1 << STATE (CLOSED))
&& any_state & (1 << STATE (COMPLETED))) {
GST_TRACE_OBJECT (webrtc, "returning connected");
return STATE (CONNECTED);
}
GST_FIXME ("unspecified situation, returning new");
return STATE (NEW);
#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_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
i);
WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans);
TransportStream *stream = trans->stream;
GstWebRTCICETransport *transport, *rtcp_transport;
GstWebRTCICEGatheringState ice_state;
gboolean rtcp_mux = FALSE;
if (rtp_trans->stopped)
continue;
if (!rtp_trans->mid)
continue;
g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL);
transport = webrtc_transceiver_get_dtls_transport (rtp_trans)->transport;
/* get gathering state */
g_object_get (transport, "gathering-state", &ice_state, NULL);
any_state |= (1 << ice_state);
if (ice_state != STATE (COMPLETE))
all_completed = FALSE;
rtcp_transport =
webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans)->transport;
if (!rtcp_mux && rtcp_transport && rtcp_transport != transport) {
g_object_get (rtcp_transport, "gathering-state", &ice_state, NULL);
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;
int i;
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *rtp_trans =
g_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
i);
WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans);
TransportStream *stream = trans->stream;
GstWebRTCDTLSTransport *transport, *rtcp_transport;
GstWebRTCICEGatheringState ice_state;
GstWebRTCDTLSTransportState dtls_state;
gboolean rtcp_mux = FALSE;
if (rtp_trans->stopped)
continue;
if (!rtp_trans->mid)
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);
any_dtls_state |= (1 << dtls_state);
g_object_get (transport->transport, "state", &ice_state, NULL);
any_ice_state |= (1 << ice_state);
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);
any_dtls_state |= (1 << dtls_state);
g_object_get (rtcp_transport->transport, "state", &ice_state, NULL);
any_ice_state |= (1 << ice_state);
}
}
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 connecting
* or checking state and none of them is in the failed state. */
if (any_ice_state & (1 << ICE_STATE (CHECKING))) {
GST_TRACE_OBJECT (webrtc, "returning connecting");
return STATE (CONNECTING);
}
if (any_dtls_state & (1 << DTLS_STATE (CONNECTING))) {
GST_TRACE_OBJECT (webrtc, "returning connecting");
return STATE (CONNECTING);
}
/* Any of the RTCIceTransport's or RTCDtlsTransport's are in the disconnected
* state and none of them are in the failed or connecting or checking state. */
if (any_ice_state & (1 << ICE_STATE (DISCONNECTED))) {
GST_TRACE_OBJECT (webrtc, "returning disconnected");
return STATE (DISCONNECTED);
}
/* All RTCIceTransport's and RTCDtlsTransport's are in the connected,
* completed or closed state and at least of them is in the connected or
* completed state. */
if (!(any_ice_state & ~(1 << ICE_STATE (CONNECTED) | 1 <<
ICE_STATE (COMPLETED) | 1 << ICE_STATE (CLOSED)))
&& !(any_dtls_state & ~(1 << DTLS_STATE (CONNECTED) | 1 <<
DTLS_STATE (CLOSED)))
&& (any_ice_state & (1 << ICE_STATE (CONNECTED) | 1 <<
ICE_STATE (COMPLETED))
|| any_dtls_state & (1 << DTLS_STATE (CONNECTED)))) {
GST_TRACE_OBJECT (webrtc, "returning connected");
return STATE (CONNECTED);
}
/* Any of the RTCIceTransport's or RTCDtlsTransport's are in the new state
* and none of the transports are in the connecting, checking, failed or
* disconnected state, or all transports are in the closed state. */
if (!(any_ice_state & ~(1 << ICE_STATE (CLOSED)))) {
GST_TRACE_OBJECT (webrtc, "returning new");
return STATE (NEW);
}
if ((any_ice_state & (1 << ICE_STATE (NEW))
|| any_dtls_state & (1 << DTLS_STATE (NEW)))
&& !(any_ice_state & (1 << ICE_STATE (CHECKING) | 1 << ICE_STATE (FAILED)
| (1 << ICE_STATE (DISCONNECTED))))
&& !(any_dtls_state & (1 << DTLS_STATE (CONNECTING) | 1 <<
DTLS_STATE (FAILED)))) {
GST_TRACE_OBJECT (webrtc, "returning new");
return STATE (NEW);
}
GST_FIXME_OBJECT (webrtc, "Undefined situation detected, returning new");
return STATE (NEW);
#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 (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)) {
if (!GST_IS_WEBRTC_BIN_PAD (l->data))
continue;
if (!GST_WEBRTC_BIN_PAD (l->data)->received_caps)
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 connection has created any RTCDataChannel's, and no m= section has
* been negotiated yet for data, return "true".
* FIXME */
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;
}
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *trans;
trans =
g_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
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) {
GST_LOG_OBJECT (webrtc, "unassociated transceiver %i %" GST_PTR_FORMAT,
i, trans);
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) {
GST_LOG_OBJECT (webrtc,
"transceiver direction doesn't match description");
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) {
GST_LOG_OBJECT (webrtc,
"transceiver direction doesn't match description");
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 * trans,
GstPadDirection direction, guint media_idx)
{
GstCaps *ret = NULL;
GST_LOG_OBJECT (webrtc, "retreiving codec preferences from %" GST_PTR_FORMAT,
trans);
if (trans && trans->codec_preferences) {
GST_LOG_OBJECT (webrtc, "Using codec preferences: %" GST_PTR_FORMAT,
trans->codec_preferences);
ret = gst_caps_ref (trans->codec_preferences);
} else {
GstWebRTCBinPad *pad = _find_pad_for_mline (webrtc, direction, media_idx);
if (pad) {
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)
ret = caps;
gst_object_unref (pad);
}
}
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 paramters? */
}
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;
g_array_append_val (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_array_append_val (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_array_index (webrtc->priv->pending_data_channels,
GstWebRTCDataChannel *, i);
if (c == channel) {
found = TRUE;
g_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_array_append_val (webrtc->priv->data_channels, channel);
g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_DATA_CHANNEL_SIGNAL], 0,
gst_object_ref (channel));
}
}
static void
_link_data_channel_to_sctp (GstWebRTCBin * webrtc,
GstWebRTCDataChannel * channel)
{
if (webrtc->priv->sctp_transport && !channel->sctp_transport) {
gint id;
g_object_get (channel, "id", &id, NULL);
if (webrtc->priv->sctp_transport->association_established && id != -1) {
gchar *pad_name;
gst_webrtc_data_channel_set_sctp_transport (channel,
webrtc->priv->sctp_transport);
pad_name = g_strdup_printf ("sink_%u", id);
if (!gst_element_link_pads (channel->appsrc, "src",
channel->sctp_transport->sctpenc, pad_name))
g_warn_if_reached ();
g_free (pad_name);
}
}
}
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);
_link_data_channel_to_sctp (webrtc, channel);
g_array_append_val (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_array_index (webrtc->priv->data_channels, GstWebRTCDataChannel *,
i);
_link_data_channel_to_sctp (webrtc, channel);
if (!channel->negotiated && !channel->opened)
gst_webrtc_data_channel_start_negotiation (channel);
}
PC_UNLOCK (webrtc);
}
}
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_array_append_val (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;
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 (!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_array_index (webrtc->priv->data_channels, GstWebRTCDataChannel *,
i);
_link_data_channel_to_sctp (webrtc, channel);
}
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) {
gst_element_sync_state_with_parent (GST_ELEMENT
(sctp_transport->sctpdec));
gst_element_sync_state_with_parent (GST_ELEMENT
(sctp_transport->sctpenc));
}
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, gboolean bundle_only)
{
/* 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
*/
gchar *direction, *sdp_mid;
GstCaps *caps;
int i;
/* "An m= section is generated for each RtpTransceiver that has been added
* to the Bin, excluding any stopped RtpTransceivers." */
if (trans->stopped)
return FALSE;
if (trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE
|| trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE)
return FALSE;
gst_sdp_media_set_port_info (media, bundle_only ? 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 if (type == GST_WEBRTC_SDP_TYPE_ANSWER) {
caps = _find_codec_preferences (webrtc, trans, GST_PAD_SRC, media_idx);
/* FIXME: add rtcp-fb paramaters */
} 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) {
GArray *reserved_pts = g_array_new (FALSE, FALSE, sizeof (guint));
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))
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);
g_array_free (reserved_pts, TRUE);
}
_media_add_ssrcs (media, caps, webrtc, WEBRTC_TRANSCEIVER (trans));
/* Some identifier; we also add the media name to it so it's identifiable */
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 (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);
}
gst_caps_unref (caps);
return TRUE;
}
/* TODO: use the options argument */
static GstSDPMessage *
_create_offer_task (GstWebRTCBin * webrtc, const GstStructure * options)
{
GstSDPMessage *ret;
int i;
GString *bundled_mids = NULL;
gchar *bundle_ufrag = NULL;
gchar *bundle_pwd = NULL;
gst_sdp_message_new (&ret);
gst_sdp_message_set_version (ret, "0");
{
/* FIXME: session id and version need special handling depending on the state we're in */
gchar *sess_id = g_strdup_printf ("%" G_GUINT64_FORMAT, RANDOM_SESSION_ID);
gst_sdp_message_set_origin (ret, "-", sess_id, "0", "IN", "IP4", "0.0.0.0");
g_free (sess_id);
}
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) {
_generate_ice_credentials (&bundle_ufrag, &bundle_pwd);
}
/* for each rtp transceiver */
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *trans;
GstSDPMedia media = { 0, };
gchar *ufrag, *pwd;
gboolean bundle_only = bundled_mids
&& webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE
&& i != 0;
trans =
g_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
i);
gst_sdp_media_init (&media);
/* mandated by JSEP */
gst_sdp_media_add_attribute (&media, "setup", "actpass");
/* FIXME: only needed when restarting ICE */
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);
if (sdp_media_from_transceiver (webrtc, &media, trans,
GST_WEBRTC_SDP_TYPE_OFFER, i, bundled_mids, 0, bundle_only)) {
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);
} else {
gst_sdp_media_uninit (&media);
}
}
/* add data channel support */
if (webrtc->priv->data_channels->len > 0) {
GstSDPMedia media = { 0, };
gchar *ufrag, *pwd, *sdp_mid;
gboolean bundle_only = bundled_mids
&& webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE
&& webrtc->priv->transceivers->len != 0;
gst_sdp_media_init (&media);
/* mandated by JSEP */
gst_sdp_media_add_attribute (&media, "setup", "actpass");
/* FIXME: only needed when restarting ICE */
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_only)
gst_sdp_media_add_attribute (&media, "bundle-only", NULL);
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);
if (bundled_mids)
g_string_append_printf (bundled_mids, " %s", sdp_mid);
g_free (sdp_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);
gst_sdp_message_add_media (ret, &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: pre-emptively setup receiving elements when needed */
/* XXX: only true for the initial offerer */
g_object_set (webrtc->priv->ice, "controller", TRUE, NULL);
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;
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) {
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");
}
_generate_ice_credentials (&bundle_ufrag, &bundle_pwd);
}
gst_sdp_message_new (&ret);
/* FIXME: session id and version need special handling depending on the state we're in */
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, "0", "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;
GstWebRTCRTPTransceiver *rtp_trans = NULL;
WebRTCTransceiver *trans = NULL;
GstWebRTCRTPTransceiverDirection offer_dir, answer_dir;
GstWebRTCDTLSSetup offer_setup, answer_setup;
GstCaps *offer_caps, *answer_caps = NULL;
guint j;
guint k;
gint target_pt = -1;
gint original_target_pt = -1;
guint target_ssrc = 0;
gboolean bundle_only;
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);
{
/* FIXME: only needed when restarting ICE */
gchar *ufrag, *pwd;
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 */
}
}
/* 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;
}
if (g_strcmp0 (gst_sdp_media_get_format (offer_media, 0),
"webrtc-datachannel") != 0) {
GST_WARNING_OBJECT (webrtc,
"format field of data channel m= line "
"is not \'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) {
const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid");
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) {
gst_sdp_media_set_proto (media, "UDP/TLS/RTP/SAVPF");
offer_caps = gst_caps_new_empty ();
for (j = 0; j < gst_sdp_media_formats_len (offer_media); j++) {
guint pt = atoi (gst_sdp_media_get_format (offer_media, j));
GstCaps *caps;
caps = gst_sdp_media_get_caps_from_media (offer_media, pt);
/* gst_sdp_media_get_caps_from_media() produces caps with name
* "application/x-unknown" which will fail intersection with
* "application/x-rtp" caps so mangle the returns caps to have the
* correct name here */
for (k = 0; k < gst_caps_get_size (caps); k++) {
GstStructure *s = gst_caps_get_structure (caps, k);
gst_structure_set_name (s, "application/x-rtp");
}
gst_caps_append (offer_caps, caps);
}
for (j = 0; j < webrtc->priv->transceivers->len; j++) {
GstCaps *trans_caps;
rtp_trans =
g_array_index (webrtc->priv->transceivers,
GstWebRTCRTPTransceiver *, j);
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", 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 (!rtp_trans) {
trans = _create_webrtc_transceiver (webrtc, answer_dir, i);
rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans);
} 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;
if (bundled_mids) {
const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid");
item = _get_or_create_transport_stream (webrtc, bundle_idx, FALSE);
g_assert (mid);
g_string_append_printf (bundled_mids, " %s", mid);
} else {
item = _get_or_create_transport_stream (webrtc, i, FALSE);
}
webrtc_transceiver_set_transport (trans, item);
}
/* 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:
if (bundled)
g_strfreev (bundled);
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;
GST_INFO_OBJECT (webrtc, "linking output stream %u", session_id);
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() */
}
typedef struct
{
guint mlineindex;
gchar *candidate;
} IceCandidateItem;
static void
_clear_ice_candidate_item (IceCandidateItem ** item)
{
g_free ((*item)->candidate);
g_free (*item);
}
static void
_add_ice_candidate (GstWebRTCBin * webrtc, IceCandidateItem * item)
{
GstWebRTCICEStream *stream;
stream = _find_ice_stream_for_session (webrtc, item->mlineindex);
if (stream == NULL) {
GST_WARNING_OBJECT (webrtc, "Unknown mline %u, ignoring", item->mlineindex);
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 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
_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, gboolean * should_connect_bundle_stream)
{
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;
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
&& 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 != prev_dir) {
ReceiveState receive_state = 0;
GST_TRACE_OBJECT (webrtc, "transceiver direction change");
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);
}
if (!bundled)
_connect_output_stream (webrtc, trans->stream, media_idx);
else
*should_connect_bundle_stream = TRUE;
/* 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);
}
receive_state = RECEIVE_STATE_PASS;
} else if (!bundled) {
receive_state = RECEIVE_STATE_DROP;
}
if (!bundled || bundle_idx == media_idx)
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 > 0)
transport_receive_bin_set_receive_state (stream->receive_bin,
receive_state);
rtp_trans->mline = media_idx;
rtp_trans->current_direction = new_dir;
}
}
/* 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;
g_object_set (webrtc->priv->sctp_transport->sctpdec, "local-sctp-port",
local_port, NULL);
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_array_index (webrtc->priv->data_channels, GstWebRTCDataChannel *, 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) {
_link_data_channel_to_sctp (webrtc, channel);
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;
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;
gboolean should_connect_bundle_stream = FALSE;
TransportStream *bundle_stream = NULL;
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));
_connect_rtpfunnel (webrtc, bundle_idx);
g_array_set_size (bundle_stream->ptmap, 0);
for (i = 0; i < gst_sdp_message_medias_len (sdp->sdp); i++) {
_update_transport_ptmap_from_media (webrtc, bundle_stream, sdp->sdp, i);
}
}
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) {
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) {
if (trans) {
_update_transceiver_from_sdp_media (webrtc, sdp->sdp, i, stream,
trans, bundled, bundle_idx, &should_connect_bundle_stream);
} else {
trans = _find_transceiver (webrtc, NULL,
(FindTransceiverFunc) _find_compatible_unassociated_transceiver);
/* XXX: default to the advertised direction in the sdp for new
* transceviers. 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, &should_connect_bundle_stream);
}
} 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 (should_connect_bundle_stream) {
g_assert (bundle_stream);
_connect_output_stream (webrtc, bundle_stream, bundle_idx);
}
ret = TRUE;
done:
if (bundled)
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;
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 (new_signaling_state != webrtc->signaling_state) {
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);
webrtc->signaling_state = new_signaling_state;
PC_UNLOCK (webrtc);
g_object_notify (G_OBJECT (webrtc), "signaling-state");
PC_LOCK (webrtc);
g_free (from);
g_free (to);
}
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 == GST_WEBRTC_SIGNALING_STATE_STABLE) {
gboolean prev_need_negotiation = webrtc->priv->need_negotiation;
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;
/* 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);
}
}
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);
}
if (webrtc->current_local_description && webrtc->current_remote_description) {
int i;
for (i = 0; i < webrtc->priv->pending_ice_candidates->len; i++) {
IceCandidateItem *item =
g_array_index (webrtc->priv->pending_ice_candidates,
IceCandidateItem *, i);
_add_ice_candidate (webrtc, item);
}
g_array_set_size (webrtc->priv->pending_ice_candidates, 0);
}
out:
if (bundled)
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 = g_new0 (IceCandidateItem, 1);
new->mlineindex = item->mlineindex;
new->candidate = g_strdup (item->candidate);
g_array_append_val (webrtc->priv->pending_ice_candidates, new);
} else {
_add_ice_candidate (webrtc, item);
}
}
static void
_free_ice_candidate_item (IceCandidateItem * item)
{
_clear_ice_candidate_item (&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_ice_candidate_task (GstWebRTCBin * webrtc, IceCandidateItem * item)
{
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);
PC_UNLOCK (webrtc);
g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_ICE_CANDIDATE_SIGNAL],
0, item->mlineindex, cand);
PC_LOCK (webrtc);
}
static void
_on_ice_candidate (GstWebRTCICE * ice, guint session_id,
gchar * candidate, GstWebRTCBin * webrtc)
{
IceCandidateItem *item = g_new0 (IceCandidateItem, 1);
item->mlineindex = session_id;
item->candidate = g_strdup (candidate);
gst_webrtc_bin_enqueue_task (webrtc,
(GstWebRTCBinFunc) _on_ice_candidate_task, item,
(GDestroyNotify) _free_ice_candidate_item);
}
/* 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);
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)
{
if (object)
gst_object_unref (*object);
}
static GArray *
gst_webrtc_bin_get_transceivers (GstWebRTCBin * webrtc)
{
GArray *arr = g_array_new (FALSE, TRUE, sizeof (gpointer));
int i;
g_array_set_clear_func (arr, (GDestroyNotify) _deref_and_unref);
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *trans =
g_array_index (webrtc->priv->transceivers, GstWebRTCRTPTransceiver *,
i);
gst_object_ref (trans);
g_array_append_val (arr, trans);
}
return arr;
}
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_boolean (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_array_append_val (webrtc->priv->data_channels, ret);
_link_data_channel_to_sctp (webrtc, ret);
if (webrtc->priv->sctp_transport &&
webrtc->priv->sctp_transport->association_established
&& !ret->negotiated)
gst_webrtc_data_channel_start_negotiation (ret);
}
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;
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;
break;
}
}
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;
GstStructure *pt_map = gst_structure_new_empty ("application/x-rtp-pt-map");
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) {
guint i;
for (i = 0; i < stream->ptmap->len; i++) {
PtMapItem *item = &g_array_index (stream->ptmap, PtMapItem, i);
if (!gst_caps_is_empty (item->caps)) {
GstStructure *s = gst_caps_get_structure (item->caps, 0);
gint pt;
const gchar *apt_str = gst_structure_get_string (s, "apt");
if (!apt_str)
continue;
if (!g_strcmp0 (gst_structure_get_string (s, "encoding-name"), "RTX") &&
gst_structure_get_int (s, "payload", &pt)) {
gst_structure_set (pt_map, apt_str, G_TYPE_UINT, pt, NULL);
}
}
}
}
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 (gst_structure_n_fields (pt_map)) {
GstElement *rtx;
GstPad *pad;
gchar *name;
GST_INFO ("creating AUX sender");
ret = gst_bin_new (NULL);
rtx = gst_element_factory_make ("rtprtxsend", NULL);
g_object_set (rtx, "payload-type-map", pt_map, "max-size-packets", 500,
NULL);
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);
}
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
" with pt red:%u rtx:%u", stream, red_pt, rtx_pt);
if (red_pt || rtx_pt)
ret = gst_bin_new (NULL);
if (rtx_pt) {
GstCaps *rtx_caps = transport_stream_get_caps_for_pt (stream, rtx_pt);
GstElement *rtx = gst_element_factory_make ("rtprtxreceive", NULL);
GstStructure *pt_map;
const GstStructure *s = gst_caps_get_structure (rtx_caps, 0);
gst_bin_add (GST_BIN (ret), rtx);
pt_map = gst_structure_new_empty ("application/x-rtp-pt-map");
gst_structure_set (pt_map, gst_structure_get_string (s, "apt"), G_TYPE_UINT,
rtx_pt, NULL);
g_object_set (rtx, "payload-type-map", pt_map, NULL);
sinkpad = gst_element_get_static_pad (rtx, "sink");
prev = rtx;
}
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);
}
return ret;
}
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_ssrc_active (GstElement * rtpbin, guint session_id, guint ssrc,
GstWebRTCBin * webrtc)
{
}
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-ssrc-active",
G_CALLBACK (on_rtpbin_ssrc_active), 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);
_update_need_negotiation (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
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));
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) 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);
}
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_array_free (webrtc->priv->transports, TRUE);
webrtc->priv->transports = NULL;
if (webrtc->priv->transceivers)
g_array_free (webrtc->priv->transceivers, TRUE);
webrtc->priv->transceivers = NULL;
if (webrtc->priv->data_channels)
g_array_free (webrtc->priv->data_channels, TRUE);
webrtc->priv->data_channels = NULL;
if (webrtc->priv->pending_data_channels)
g_array_free (webrtc->priv->pending_data_channels, TRUE);
webrtc->priv->pending_data_channels = NULL;
if (webrtc->priv->pending_ice_candidates)
g_array_free (webrtc->priv->pending_ice_candidates, TRUE);
webrtc->priv->pending_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->stats)
gst_structure_free (webrtc->priv->stats);
webrtc->priv->stats = NULL;
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 to use for this connection",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READWRITE | 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",
GST_TYPE_WEBRTC_SESSION_DESCRIPTION,
G_PARAM_READWRITE | 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 #GstWebRtcBin
* @options: 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,
g_cclosure_marshal_generic, G_TYPE_NONE, 2, GST_TYPE_STRUCTURE,
GST_TYPE_PROMISE);
/**
* GstWebRTCBin::create-answer:
* @object: the #GstWebRtcBin
* @options: 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,
g_cclosure_marshal_generic, G_TYPE_NONE, 2, GST_TYPE_STRUCTURE,
GST_TYPE_PROMISE);
/**
* GstWebRTCBin::set-local-description:
* @object: the #GstWebRtcBin
* @desc: a #GstWebRTCSessionDescription description
* @promise (allow-none): 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,
g_cclosure_marshal_generic, G_TYPE_NONE, 2,
GST_TYPE_WEBRTC_SESSION_DESCRIPTION, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::set-remote-description:
* @object: the #GstWebRtcBin
* @desc: a #GstWebRTCSessionDescription description
* @promise (allow-none): 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,
g_cclosure_marshal_generic, G_TYPE_NONE, 2,
GST_TYPE_WEBRTC_SESSION_DESCRIPTION, GST_TYPE_PROMISE);
/**
* GstWebRTCBin::add-ice-candidate:
* @object: the #GstWebRtcBin
* @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,
g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING);
/**
* GstWebRTCBin::get-stats:
* @object: the #GstWebRtcBin
* @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 identifer 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,
g_cclosure_marshal_generic, G_TYPE_NONE, 2, GST_TYPE_PAD,
GST_TYPE_PROMISE);
/**
* GstWebRTCBin::on-negotiation-needed:
* @object: the #GstWebRtcBin
*/
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, g_cclosure_marshal_generic,
G_TYPE_NONE, 0);
/**
* GstWebRTCBin::on-ice-candidate:
* @object: the #GstWebRtcBin
* @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, g_cclosure_marshal_generic,
G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING);
/**
* GstWebRTCBin::on-new-transceiver:
* @object: the #GstWebRtcBin
* @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, g_cclosure_marshal_generic,
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, g_cclosure_marshal_generic,
G_TYPE_NONE, 1, GST_TYPE_WEBRTC_DATA_CHANNEL);
/**
* GstWebRTCBin::add-transceiver:
* @object: the #GstWebRtcBin
* @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,
g_cclosure_marshal_generic, GST_TYPE_WEBRTC_RTP_TRANSCEIVER, 2,
GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, GST_TYPE_CAPS);
/**
* GstWebRTCBin::get-transceivers:
* @object: the #GstWebRtcBin
*
* 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,
g_cclosure_marshal_generic, G_TYPE_ARRAY, 0);
/**
* 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,
g_cclosure_marshal_generic, 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 guarenteed 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 announcment. 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: 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,
g_cclosure_marshal_generic, GST_TYPE_WEBRTC_DATA_CHANNEL, 2,
G_TYPE_STRING, GST_TYPE_STRUCTURE);
}
static void
_deref_unparent_and_unref (GObject ** object)
{
GstObject *obj = GST_OBJECT (*object);
GST_OBJECT_PARENT (obj) = NULL;
gst_object_unref (*object);
}
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));
webrtc->rtpbin = _create_rtpbin (webrtc);
gst_bin_add (GST_BIN (webrtc), webrtc->rtpbin);
webrtc->priv->transceivers = g_array_new (FALSE, TRUE, sizeof (gpointer));
g_array_set_clear_func (webrtc->priv->transceivers,
(GDestroyNotify) _deref_unparent_and_unref);
webrtc->priv->transports = g_array_new (FALSE, TRUE, sizeof (gpointer));
g_array_set_clear_func (webrtc->priv->transports,
(GDestroyNotify) _transport_free);
webrtc->priv->data_channels = g_array_new (FALSE, TRUE, sizeof (gpointer));
g_array_set_clear_func (webrtc->priv->data_channels,
(GDestroyNotify) _deref_and_unref);
webrtc->priv->pending_data_channels =
g_array_new (FALSE, TRUE, sizeof (gpointer));
g_array_set_clear_func (webrtc->priv->pending_data_channels,
(GDestroyNotify) _deref_and_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_ice_candidate), webrtc);
webrtc->priv->ice_stream_map =
g_array_new (FALSE, TRUE, sizeof (IceStreamItem));
webrtc->priv->pending_ice_candidates =
g_array_new (FALSE, TRUE, sizeof (IceCandidateItem *));
g_array_set_clear_func (webrtc->priv->pending_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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