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/*
* Copyright (C) 2025 Igalia S.L. All rights reserved.
* Copyright (C) 2025 Metrological Group B.V.
* Copyright (C) 2024 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "RiceGioBackend.h"
#if USE(GSTREAMER_WEBRTC) && USE(LIBRICE)
#include "RiceUtilities.h"
#include <gst/gst.h>
#include <rice-proto.h>
#include <wtf/MonotonicTime.h>
#include <wtf/Seconds.h>
#include <wtf/StdLibExtras.h>
#include <wtf/glib/RunLoopSourcePriority.h>
#define GST_CAT_DEFAULT gst_webrtc_rice_gio_debug
GST_DEBUG_CATEGORY_STATIC(GST_CAT_DEFAULT);
using namespace::WebCore;
struct _AgentSource {
GSource source;
GThreadSafeWeakPtr<WebKitGstIceAgent> agent;
bool complete;
};
static gboolean agentSourcePrepare(GSource* base, gint* timeout)
{
auto source = reinterpret_cast<AgentSource*>(base);
auto iceAgent = source->agent.get();
if (!iceAgent)
return FALSE;
const auto& agent = webkitGstWebRTCIceAgentGetRiceAgent(iceAgent.get());
auto now = WTF::MonotonicTime::now().secondsSinceEpoch();
gboolean result = FALSE;
while (true) {
RiceAgentPoll ret;
rice_agent_poll_init(&ret);
GST_TRACE_OBJECT(iceAgent.get(), "Polling");
rice_agent_poll(agent.get(), now.nanoseconds(), &ret);
GST_TRACE_OBJECT(iceAgent.get(), "Polling DONE");
switch (ret.tag) {
case RICE_AGENT_POLL_CLOSED:
GST_TRACE_OBJECT(iceAgent.get(), "Agent closed!");
source->complete = true;
rice_agent_poll_clear(&ret);
webkitGstWebRTCIceAgentClosed(iceAgent.get());
return TRUE;
case RICE_AGENT_POLL_COMPONENT_STATE_CHANGE:
GST_TRACE_OBJECT(iceAgent.get(), "Component state changed");
webkitGstWebRTCIceAgentComponentStateChangedForStream(iceAgent.get(), ret.component_state_change.stream_id, ret.component_state_change);
result = TRUE;
break;
case RICE_AGENT_POLL_ALLOCATE_SOCKET:
GST_FIXME("allocate socket is not handled");
result = TRUE;
break;
case RICE_AGENT_POLL_REMOVE_SOCKET:
GST_FIXME("remove socket is not handled");
result = TRUE;
break;
case RICE_AGENT_POLL_WAIT_UNTIL_NANOS: {
auto delta = Seconds::fromNanoseconds(ret.wait_until_nanos - now.nanoseconds());
if (delta >= 99998_s) {
GST_TRACE_OBJECT(iceAgent.get(), "Nothing special to do.");
result = FALSE;
break;
}
if (timeout) {
*timeout = static_cast<int>(delta.milliseconds());
GST_TRACE_OBJECT(iceAgent.get(), "Waiting for %d ms", *timeout);
}
result = FALSE;
break;
}
case RICE_AGENT_POLL_GATHERING_COMPLETE:
GST_TRACE_OBJECT(iceAgent.get(), "Gathering complete");
webkitGstWebRTCIceAgentGatheringDoneForStream(iceAgent.get(), ret.gathering_complete.stream_id);
break;
case RICE_AGENT_POLL_GATHERED_CANDIDATE:
GST_TRACE_OBJECT(iceAgent.get(), "Gathered candidate");
webkitGstWebRTCIceAgentLocalCandidateGatheredForStream(iceAgent.get(), ret.gathered_candidate.stream_id, ret.gathered_candidate);
result = TRUE;
break;
case RICE_AGENT_POLL_SELECTED_PAIR:
GST_TRACE_OBJECT(iceAgent.get(), "New selected pair");
webkitGstWebRTCIceAgentNewSelectedPairForStream(iceAgent.get(), ret.selected_pair.stream_id, ret.selected_pair);
result = TRUE;
break;
};
rice_agent_poll_clear(&ret);
RiceTransmit transmit;
rice_transmit_init(&transmit);
rice_agent_poll_transmit(agent.get(), now.nanoseconds(), &transmit);
if (transmit.from && transmit.to) {
auto from = riceAddressToString(transmit.from);
auto to = riceAddressToString(transmit.to);
auto protocol = riceTransmitTransportToIceProtocol(transmit);
if (auto handle = riceTransmitToSharedMemoryHandle(&transmit)) {
webkitGstWebRTCIceAgentSend(iceAgent.get(), transmit.stream_id, protocol, WTF::move(from), WTF::move(to), WTF::move(*handle));
result = TRUE;
}
} else
rice_transmit_clear(&transmit);
if (!result)
break;
}
return result;
}
static gboolean agentSourceCheck(GSource*)
{
return TRUE;
}
static gboolean agentSourceDispatch(GSource* base, GSourceFunc callback, gpointer data)
{
auto source = reinterpret_cast<AgentSource*>(base);
if (callback)
callback(data);
return !source->complete;
}
static void agentSourceFinalize(GSource*)
{
}
static GSourceFuncs agentEventSourceFuncs = {
agentSourcePrepare,
agentSourceCheck,
agentSourceDispatch,
agentSourceFinalize,
nullptr, nullptr
};
GRefPtr<GSource> agentSourceNew(GThreadSafeWeakPtr<WebKitGstIceAgent>&& agent)
{
static std::once_flag debugRegisteredFlag;
std::call_once(debugRegisteredFlag, [] {
GST_DEBUG_CATEGORY_INIT(GST_CAT_DEFAULT, "webkitwebrtcricegio", 0, "webkitwebrtcricegio");
});
auto source = adoptGRef(g_source_new(&agentEventSourceFuncs, sizeof(AgentSource)));
g_source_set_priority(source.get(), RunLoopSourcePriority::AsyncIONetwork);
g_source_set_name(source.get(), "[WebKit] ICE Agent loop");
auto agentSource = reinterpret_cast<AgentSource*>(source.get());
if (auto iceAgent = agent.get()) [[likely]]
agentSource->agent.reset(iceAgent.get());
agentSource->complete = false;
return source;
}
#undef GST_CAT_DEFAULT
#endif // USE(GSTREAMER_WEBRTC) && USE(LIBRICE)
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