Manager 提供的是media thread

• 说明media thread 是主线程， 而 mediamgr里是worker thread
• networkmgr是network thread了。
  

Manager 的功能重要，但是特别短

• G:\CDN\P2P-DEV\tdesktop-offical\Telegram\ThirdParty\tgcalls\tgcalls\Manager.cpp

class Manager final : public std::enable_shared_from_this<Manager> {
private:
    struct ResolvedNetworkStatus {
        bool isLowCost = false;
        bool isLowDataRequested = false;

        bool operator==(const ResolvedNetworkStatus &rhs) const;
        bool operator!=(const ResolvedNetworkStatus &rhs) const;
    };

public:
	static rtc::Thread *getMediaThread();

	Manager(rtc::Thread *thread, Descriptor &&descriptor);
	~Manager();

	void start();
	void receiveSignalingData(const std::vector<uint8_t> &data);
	void setVideoCapture(std::shared_ptr<VideoCaptureInterface> videoCapture);
    void sendVideoDeviceUpdated();
    void setRequestedVideoAspect(float aspect);
    void setMuteOutgoingAudio(bool mute);
	void setIncomingVideoOutput(std::weak_ptr<rtc::VideoSinkInterface<webrtc::VideoFrame>> sink);
    void setIsLowBatteryLevel(bool isLowBatteryLevel);
    void setIsLocalNetworkLowCost(bool isLocalNetworkLowCost);
    void getNetworkStats(std::function<void(TrafficStats, CallStats)> completion);


	void setAudioInputDevice(std::string id);
	void setAudioOutputDevice(std::string id);
	void setInputVolume(float level);
	void setOutputVolume(float level);

    void addExternalAudioSamples(std::vector<uint8_t> &&samples);

private:
	void sendSignalingAsync(int delayMs, int cause);
	void receiveMessage(DecryptedMessage &&message);
    void updateCurrentResolvedNetworkStatus();
    void sendInitialSignalingMessages();

	rtc::Thread *_thread;
	EncryptionKey _encryptionKey;
	EncryptedConnection _signaling;
	bool _enableP2P = false;
    bool _enableTCP = false;
    bool _enableStunMarking = false;
    ProtocolVersion _protocolVersion = ProtocolVersion::V0;
    FilePath _statsLogPath;
	std::vector<RtcServer> _rtcServers;
    std::unique_ptr<Proxy> _proxy;
	MediaDevicesConfig _mediaDevicesConfig;
	std::shared_ptr<VideoCaptureInterface> _videoCapture;
	std::function<void(State)> _stateUpdated;
	std::function<void(AudioState, VideoState)> _remoteMediaStateUpdated;
    std::function<void(bool)> _remoteBatteryLevelIsLowUpdated;
    std::function<void(float)> _remotePrefferedAspectRatioUpdated;
	std::function<void(const std::vector<uint8_t> &)> _signalingDataEmitted;
    std::function<void(int)> _signalBarsUpdated;
    std::function<void(float)> _audioLevelUpdated;
	std::function<rtc::scoped_refptr<webrtc::AudioDeviceModule>(webrtc::TaskQueueFactory*)> _createAudioDeviceModule;
	std::function<uint32_t(const Message &)> _sendSignalingMessage;
	std::function<void(Message&&)> _sendTransportMessage;
	std::unique_ptr<ThreadLocalObject<NetworkManager>> _networkManager;
	std::unique_ptr<ThreadLocalObject<MediaManager>> _mediaManager;
	State _state = State::Reconnecting;
    bool _didConnectOnce = false;
    bool _enableHighBitrateVideo = false;
    DataSaving _dataSaving = DataSaving::Never;
    std::vector<std::string> _preferredCodecs;
    bool _localNetworkIsLowCost = false;
    bool _remoteNetworkIsLowCost = false;
    bool _remoteIsLowDataRequested = false;
    absl::optional<ResolvedNetworkStatus> _currentResolvedLocalNetworkStatus;
    absl::optional<ResolvedNetworkStatus> _currentResolvedNetworkStatus;

};

信令

_signaling(
	EncryptedConnection::Type::Signaling,
	_encryptionKey,
	[=](int delayMs, int cause) { sendSignalingAsync(delayMs, cause); }),

信令发送方式 ：_sendSignalingMessage

sendSignalingAsync ： 扔到主线程（mediathread） 执行延迟任务？

void Manager::sendSignalingAsync(int delayMs, int cause) {
	auto task = [weak = std::weak_ptr<Manager>(shared_from_this()), cause] {
		const auto strong = weak.lock();
		if (!strong) {
			return;
		}
		if (const auto prepared = strong->_signaling.prepareForSendingService(cause)) {
			strong->_signalingDataEmitted(prepared->bytes);
		}
	};
	if (delayMs) {
		_thread->PostDelayedTask(std::move(task), delayMs);
	} else {
		_thread->PostTask(std::move(task));
	}
}

媒体包发送 ：_sendTransportMessage

	_sendTransportMessage = [=](Message &&message) {
		_networkManager->perform(RTC_FROM_HERE, [message = std::move(message)](NetworkManager *networkManager) {
			networkManager->sendMessage(message);
		});
	};

在Manager中完成对消息发送方的实现

• 但是_sendSignalingMessage 是外部传递下来的：
  

收到消息的处理

void Manager::receiveMessage(DecryptedMessage &&message) {
	const auto data = &message.message.data;
	if (const auto candidatesList = absl::get_if<CandidatesListMessage>(data)) {
		_networkManager->perform(RTC_FROM_HERE, [message = std::move(message)](NetworkManager *networkManager) mutable {
			networkManager->receiveSignalingMessage(std::move(message));
		});
	} else if (const auto videoFormats = absl::get_if<VideoFormatsMessage>(data)) {
		_mediaManager->perform(RTC_FROM_HERE, [message = std::move(message)](MediaManager *mediaManager) mutable {
			mediaManager->receiveMessage(std::move(message));
		});
    } else if (const auto remoteMediaState = absl::get_if<RemoteMediaStateMessage>(data)) {
		if (_remoteMediaStateUpdated) {
			_remoteMediaStateUpdated(
				remoteMediaState->audio,
				remoteMediaState->video);
		}
        _mediaManager->perform(RTC_FROM_HERE, [video = remoteMediaState->video](MediaManager *mediaManager) {
            mediaManager->remoteVideoStateUpdated(video);
        });
	} else if (const auto remoteBatteryLevelIsLow = absl::get_if<RemoteBatteryLevelIsLowMessage>(data)) {
        if (_remoteBatteryLevelIsLowUpdated) {
			_remoteBatteryLevelIsLowUpdated(remoteBatteryLevelIsLow->batteryLow);
        }
    } else if (const auto remoteNetworkStatus = absl::get_if<RemoteNetworkStatusMessage>(data)) {
        _remoteNetworkIsLowCost = remoteNetworkStatus->isLowCost;
        _remoteIsLowDataRequested = remoteNetworkStatus->isLowDataRequested;
        updateCurrentResolvedNetworkStatus();
    } else {
        if (const auto videoParameters = absl::get_if<VideoParametersMessage>(data)) {
            float value = ((float)videoParameters->aspectRatio) / 1000.0;
			if (_remotePrefferedAspectRatioUpdated) {
				_remotePrefferedAspectRatioUpdated(value);
			}
        }
		_mediaManager->perform(RTC_FROM_HERE, [=, message = std::move(message)](MediaManager *mediaManager) mutable {
			mediaManager->receiveMessage(std::move(message));
		});
	}
}

candidatesList 给到networkManager

	if (const auto candidatesList = absl::get_if<CandidatesListMessage>(data)) {
		_networkManager->perform(RTC_FROM_HERE, [message = std::move(message)](NetworkManager *networkManager) mutable {
			networkManager->receiveSignalingMessage(std::move(message));
		});
	}

VideoFormatsMessage 给到mediaManager

	} else if (const auto videoFormats = absl::get_if<VideoFormatsMessage>(data)) {
		_mediaManager->perform(RTC_FROM_HERE, [message = std::move(message)](MediaManager *mediaManager) mutable {
			mediaManager->receiveMessage(std::move(message));
		});

RemoteMediaStateMessage

    } else if (const auto remoteMediaState = absl::get_if<RemoteMediaStateMessage>(data)) {
		if (_remoteMediaStateUpdated) {
			_remoteMediaStateUpdated(
				remoteMediaState->audio,
				remoteMediaState->video);
		}
        _mediaManager->perform(RTC_FROM_HERE, [video = remoteMediaState->video](MediaManager *mediaManager) {
            mediaManager->remoteVideoStateUpdated(video);
        });
	}

RemoteBatteryLevelIsLowMessage 对端的电池

	} else if (const auto remoteBatteryLevelIsLow = absl::get_if<RemoteBatteryLevelIsLowMessage>(data)) {
        if (_remoteBatteryLevelIsLowUpdated) {
			_remoteBatteryLevelIsLowUpdated(remoteBatteryLevelIsLow->batteryLow);
        }
    } 

对端的网络

    } else if (const auto remoteNetworkStatus = absl::get_if<RemoteNetworkStatusMessage>(data)) {
        _remoteNetworkIsLowCost = remoteNetworkStatus->isLowCost;
        _remoteIsLowDataRequested = remoteNetworkStatus->isLowDataRequested;
        updateCurrentResolvedNetworkStatus();
    }