feat: 增加webrtc代理拉流 (#4389)

- 增加客户端模式，支持主动拉流、推流：
   - addStreamProxy接口新增支持whep主动拉流，拉流地址目前只兼容zlm的whep url。
   - addStreamPusherProxy接口新增支持whip主动推流，推流地址目前只兼容zlm的whip url。
   - 以上推流url格式为webrtc[s]://server_host:server_port/app/stream_id?key=value, 内部会自动转换为http[s]://server_host:server_port/index/api/[whip/whep]?app=app&stream=stream_id&key=value。

- 增加WebRtc p2p 模式：
  - 增加 ICE FULL模式。
  - 增加STUN/TURN 服务器。
  - 增加websocket 信令。
  - 增加P2P代理拉流。

---------

Co-authored-by: xia-chu <771730766@qq.com>
Co-authored-by: mtdxc <mtdxc@126.com>
Co-authored-by: cqm <cqm@97kid.com>

webrtc/WebRtcProxyPusher.cpp

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT-like license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "WebRtcProxyPusher.h"
+#include "Common/config.h"
+#include "Http/HlsPlayer.h"
+#include "Rtsp/RtspMediaSourceImp.h"
+#include "WebRtcPlayer.h"
+
+using namespace toolkit;
+using namespace std;
+
+namespace mediakit {
+
+WebRtcProxyPusher::WebRtcProxyPusher(const EventPoller::Ptr &poller, const RtspMediaSource::Ptr &src)
+    : WebRtcClient(poller) {
+    _push_src = src;
+    DebugL;
+}
+
+WebRtcProxyPusher::~WebRtcProxyPusher(void) {
+    teardown();
+    DebugL;
+}
+
+void WebRtcProxyPusher::publish(const string &strUrl) {
+    DebugL;
+    try {
+        _url.parse(strUrl, isPlayer());
+    } catch (std::exception &ex) {
+        onResult(SockException(Err_other, StrPrinter << "illegal webrtc url:" << ex.what()));
+        return;
+    }
+
+    startConnect();
+}
+
+void WebRtcProxyPusher::teardown() {
+    DebugL;
+    _transport = nullptr;
+}
+
+void WebRtcProxyPusher::onResult(const SockException &ex) {
+    DebugL << ex;
+    if (!ex) {
+        onPublishResult(ex);
+    } else {
+        if (!_is_negotiate_finished) {
+            onPublishResult(ex);
+        } else {
+            onShutdown(ex);
+        }
+    }
+}
+
+float WebRtcProxyPusher::getTimeOutSec() {
+    auto timeoutMS = (*this)[Client::kTimeoutMS].as<uint64_t>();
+    return (float)timeoutMS / (float)1000;
+}
+
+void WebRtcProxyPusher::startConnect() {
+    DebugL;
+    MediaInfo info(_url._full_url);
+    info.schema = "rtc";
+    auto src = _push_src.lock();
+    if (!src) {
+        onResult(SockException(Err_other, "media source released"));
+        return;
+    }
+    std::weak_ptr<WebRtcProxyPusher> weak_self = std::static_pointer_cast<WebRtcProxyPusher>(shared_from_this());
+    _transport = WebRtcPlayer::create(getPoller(), src, info, WebRtcTransport::Role::CLIENT, _url._signaling_protocols);
+    _transport->setOnShutdown([weak_self](const SockException &ex) {
+        if (auto strong_self = weak_self.lock()) {
+            strong_self->onResult(ex);
+        }
+    });
+    _transport->setOnStartWebRTC([weak_self]() {
+        if (auto strong_self = weak_self.lock()) {
+            strong_self->onResult(SockException());
+        }
+    });
+    WebRtcClient::startConnect();
+}
+
+} /* namespace mediakit */