//
//  Agora Rtc Engine SDK
//
//  Created by Sting Feng in 2015-02.
//  Copyright (c) 2015 Agora IO. All rights reserved.
//

#ifndef AGORA_RTC_ENGINE_H
#define AGORA_RTC_ENGINE_H

#include <stddef.h>
#include <stdio.h>
#include <stdarg.h>

#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define AGORA_CALL __cdecl
#if defined(AGORARTC_EXPORT)
#define AGORA_API extern "C" __declspec(dllexport)
#else
#define AGORA_API extern "C" __declspec(dllimport)
#endif
#elif defined(__APPLE__)
#define AGORA_API __attribute__((visibility("default"))) extern "C"
#define AGORA_CALL
#elif defined(__ANDROID__) || defined(__linux__)
#define AGORA_API extern "C" __attribute__((visibility("default")))
#define AGORA_CALL
#else
#define AGORA_API extern "C"
#define AGORA_CALL
#endif

namespace agora {
    namespace util {

template<class T>
class AutoPtr {
    typedef T value_type;
    typedef T* pointer_type;
public:
    AutoPtr(pointer_type p=0)
        :ptr_(p)
    {}
    ~AutoPtr() {
        if (ptr_)
            ptr_->release();
    }
    operator bool() const { return ptr_ != (pointer_type)0; }
    value_type& operator*() const {
        return *get();
    }

    pointer_type operator->() const {
        return get();
    }

    pointer_type get() const {
        return ptr_;
    }

    pointer_type release() {
        pointer_type tmp = ptr_;
        ptr_ = 0;
        return tmp;
    }

    void reset(pointer_type ptr = 0) {
        if (ptr != ptr_ && ptr_)
            ptr_->release();
        ptr_ = ptr;
    }
    template<class C1, class C2>
    bool queryInterface(C1* c, C2 iid) {
        pointer_type p = NULL;
        if (c && !c->queryInterface(iid, (void**)&p))
        {
            reset(p);
        }
        return p != NULL;;
	}
private:
    AutoPtr(const AutoPtr&);
    AutoPtr& operator=(const AutoPtr&);
private:
    pointer_type ptr_;
};
class IString {
public:
    virtual bool empty() const = 0;
    virtual const char* c_str() = 0;
    virtual const char* data() = 0;
    virtual size_t length() = 0;
    virtual void release() = 0;
};
typedef AutoPtr<IString> AString;

    }//namespace util
namespace rtc {
    typedef unsigned int uid_t;
    typedef void* view_t;

enum INTERFACE_ID_TYPE
{
    AGORA_IID_AUDIO_DEVICE_MANAGER = 1,
    AGORA_IID_VIDEO_DEVICE_MANAGER = 2,
    AGORA_IID_RTC_ENGINE_PARAMETER = 3,
    AGORA_IID_MEDIA_ENGINE = 4,
};

enum WARN_CODE_TYPE
{
    WARN_INVALID_VIEW = 8,
    WARN_INIT_VIDEO = 16,
    WARN_PENDING = 20,
	WARN_NO_AVAILABLE_CHANNEL = 103,
    WARN_LOOKUP_CHANNEL_TIMEOUT = 104,
    WARN_LOOKUP_CHANNEL_REJECTED = 105,
    WARN_OPEN_CHANNEL_TIMEOUT = 106,
    WARN_OPEN_CHANNEL_REJECTED = 107,

    // sdk: 100~1000
    WARN_SWITCH_LIVE_VIDEO_TIMEOUT = 111,
    WARN_SET_CLIENT_ROLE_TIMEOUT = 118,
    WARN_OPEN_CHANNEL_INVALID_TICKET = 121,
    WARN_OPEN_CHANNEL_TRY_NEXT_VOS = 122,
    WARN_AUDIO_MIXING_OPEN_ERROR = 701,

    WARN_ADM_RUNTIME_PLAYOUT_WARNING = 1014,
    WARN_ADM_RUNTIME_RECORDING_WARNING = 1016,
    WARN_ADM_RECORD_AUDIO_SILENCE = 1019,
    WARN_ADM_PLAYOUT_MALFUNCTION = 1020,
    WARN_ADM_RECORD_MALFUNCTION = 1021,
    WARN_ADM_WIN_CORE_NO_RECORDING_DEVICE = 1322,
    WARN_ADM_WIN_CORE_NO_PLAYOUT_DEVICE = 1323,
    WARN_ADM_WIN_CORE_IMPROPER_CAPTURE_RELEASE = 1324,
    WARN_ADM_RECORD_AUDIO_LOWLEVEL = 1031,
    WARN_ADM_WINDOWS_NO_DATA_READY_EVENT = 1040,
    WARN_APM_HOWLING = 1051,
};

enum ERROR_CODE_TYPE
{
    ERR_OK = 0,
    //1~1000
    ERR_FAILED = 1,
    ERR_INVALID_ARGUMENT = 2,
    ERR_NOT_READY = 3,
    ERR_NOT_SUPPORTED = 4,
    ERR_REFUSED = 5,
    ERR_BUFFER_TOO_SMALL = 6,
    ERR_NOT_INITIALIZED = 7,
    ERR_NO_PERMISSION = 9,
    ERR_TIMEDOUT = 10,
    ERR_CANCELED = 11,
    ERR_TOO_OFTEN = 12,
    ERR_BIND_SOCKET = 13,
    ERR_NET_DOWN = 14,
    ERR_NET_NOBUFS = 15,
    ERR_JOIN_CHANNEL_REJECTED = 17,
    ERR_LEAVE_CHANNEL_REJECTED = 18,
	ERR_ALREADY_IN_USE = 19,
	ERR_ABORTED = 20,
    ERR_INIT_NET_ENGINE = 21,
    ERR_INVALID_APP_ID = 101,
    ERR_INVALID_CHANNEL_NAME = 102,
    ERR_CHANNEL_KEY_EXPIRED = 109,
    ERR_INVALID_CHANNEL_KEY = 110,
	ERR_CONNECTION_INTERRUPTED = 111, // only used in web sdk
	ERR_CONNECTION_LOST = 112, // only used in web sdk
    ERR_DECRYPTION_FAILED = 120,

    ERR_NOT_IN_CHANNEL = 113,
    ERR_SIZE_TOO_LARGE = 114,
	ERR_BITRATE_LIMIT = 115,
	ERR_TOO_MANY_DATA_STREAMS = 116,
	ERR_STREAM_MESSAGE_TIMEOUT = 117,
    ERR_SET_CLIENT_ROLE_NOT_AUTHORIZED = 119,
    ERR_CLIENT_IS_BANNED_BY_SERVER = 123,

    //1001~2000
    ERR_LOAD_MEDIA_ENGINE = 1001,
    ERR_START_CALL = 1002,
    ERR_START_CAMERA = 1003,
    ERR_START_VIDEO_RENDER = 1004,
    ERR_ADM_GENERAL_ERROR = 1005,
    ERR_ADM_JAVA_RESOURCE = 1006,
    ERR_ADM_SAMPLE_RATE = 1007,
    ERR_ADM_INIT_PLAYOUT = 1008,
    ERR_ADM_START_PLAYOUT = 1009,
    ERR_ADM_STOP_PLAYOUT = 1010,
    ERR_ADM_INIT_RECORDING = 1011,
    ERR_ADM_START_RECORDING = 1012,
    ERR_ADM_STOP_RECORDING = 1013,
    ERR_ADM_RUNTIME_PLAYOUT_ERROR = 1015,
    ERR_ADM_RUNTIME_RECORDING_ERROR = 1017,
    ERR_ADM_RECORD_AUDIO_FAILED = 1018,
    ERR_ADM_INIT_LOOPBACK = 1022,
    ERR_ADM_START_LOOPBACK = 1023,
    ERR_ADM_NO_PERMISSION = 1027,
    // 1025, as warning for interruption of adm on ios
    // 1026, as warning for route change of adm on ios
    ERR_ADM_ANDROID_JNI_JAVA_RECORD_ERROR = 1115,

    // VDM error code starts from 1500
    ERR_VDM_CAMERA_NOT_AUTHORIZED  = 1501,

    // VCM error code starts from 1600
    ERR_VCM_UNKNOWN_ERROR = 1600,
    ERR_VCM_ENCODER_INIT_ERROR = 1601,
    ERR_VCM_ENCODER_ENCODE_ERROR = 1602,
    ERR_VCM_ENCODER_SET_ERROR = 1603,
};

enum LOG_FILTER_TYPE
{
	LOG_FILTER_OFF = 0,
    LOG_FILTER_DEBUG = 0x080f,
    LOG_FILTER_INFO = 0x000f,
    LOG_FILTER_WARN = 0x000e,
    LOG_FILTER_ERROR = 0x000c,
    LOG_FILTER_CRITICAL = 0x0008,
	LOG_FILTER_MASK = 0x80f,
};

enum MAX_DEVICE_ID_LENGTH_TYPE
{
    MAX_DEVICE_ID_LENGTH = 512
};

enum QUALITY_REPORT_FORMAT_TYPE
{
    QUALITY_REPORT_JSON = 0,
    QUALITY_REPORT_HTML = 1,
};

enum MEDIA_ENGINE_EVENT_CODE_TYPE
{
    MEDIA_ENGINE_RECORDING_ERROR = 0,
    MEDIA_ENGINE_PLAYOUT_ERROR = 1,
    MEDIA_ENGINE_RECORDING_WARNING = 2,
    MEDIA_ENGINE_PLAYOUT_WARNING = 3,
    MEDIA_ENGINE_AUDIO_FILE_MIX_FINISH = 10,
    MEDIA_ENGINE_AUDIO_FAREND_MUSIC_BEGINS = 12,
    MEDIA_ENGINE_AUDIO_FAREND_MUSIC_ENDS = 13,
    // media engine role changed
    MEDIA_ENGINE_ROLE_BROADCASTER_SOLO = 20,
    MEDIA_ENGINE_ROLE_BROADCASTER_INTERACTIVE = 21,
    MEDIA_ENGINE_ROLE_AUDIENCE = 22,
    MEDIA_ENGINE_ROLE_COMM_PEER = 23,
    MEDIA_ENGINE_ROLE_GAME_PEER = 24,
    // iOS adm sample rate changed
    MEDIA_ENGINE_AUDIO_ADM_REQUIRE_RESTART = 110,
    MEDIA_ENGINE_AUDIO_ADM_SPECIAL_RESTART = 111,
    // iOS keep AVAudioSession settings
    MEDIA_ENGINE_AUDIO_KEEP_SESSION_CONFIG = 120
};

enum MEDIA_DEVICE_STATE_TYPE
{
    MEDIA_DEVICE_STATE_ACTIVE = 1,
    MEDIA_DEVICE_STATE_DISABLED = 2,
    MEDIA_DEVICE_STATE_NOT_PRESENT = 4,
    MEDIA_DEVICE_STATE_UNPLUGGED = 8
};

enum MEDIA_DEVICE_TYPE
{
    UNKNOWN_AUDIO_DEVICE = -1,
    AUDIO_PLAYOUT_DEVICE = 0,
    AUDIO_RECORDING_DEVICE = 1,
    VIDEO_RENDER_DEVICE = 2,
    VIDEO_CAPTURE_DEVICE = 3,
    AUDIO_APPLICATION_PLAYOUT_DEVICE = 4,
};

enum AUDIO_RECORDING_QUALITY_TYPE
{
    AUDIO_RECORDING_QUALITY_LOW = 0,
    AUDIO_RECORDING_QUALITY_MEDIUM = 1,
    AUDIO_RECORDING_QUALITY_HIGH = 2,
};

enum QUALITY_TYPE
{
    QUALITY_UNKNOWN = 0,
    QUALITY_EXCELLENT = 1,
    QUALITY_GOOD = 2,
    QUALITY_POOR = 3,
    QUALITY_BAD = 4,
    QUALITY_VBAD = 5,
    QUALITY_DOWN = 6,
};

enum RENDER_MODE_TYPE
{
    RENDER_MODE_HIDDEN = 1,
    RENDER_MODE_FIT = 2,
    RENDER_MODE_ADAPTIVE = 3,
};

enum VIDEO_MIRROR_MODE_TYPE
{
    VIDEO_MIRROR_MODE_AUTO = 0,//determined by SDK
    VIDEO_MIRROR_MODE_ENABLED = 1,//enabled mirror
    VIDEO_MIRROR_MODE_DISABLED = 2,//disable mirror
};

enum VIDEO_PROFILE_TYPE
{                                   // res       fps  kbps
    VIDEO_PROFILE_120P = 0,         // 160x120   15   65
    VIDEO_PROFILE_120P_3 = 2,       // 120x120   15   50
    VIDEO_PROFILE_180P = 10,        // 320x180   15   140
    VIDEO_PROFILE_180P_3 = 12,      // 180x180   15   100
    VIDEO_PROFILE_180P_4 = 13,      // 240x180   15   120
    VIDEO_PROFILE_240P = 20,        // 320x240   15   200
    VIDEO_PROFILE_240P_3 = 22,      // 240x240   15   140
    VIDEO_PROFILE_240P_4 = 23,      // 424x240   15   220
    VIDEO_PROFILE_360P = 30,        // 640x360   15   400
    VIDEO_PROFILE_360P_3 = 32,      // 360x360   15   260
    VIDEO_PROFILE_360P_4 = 33,      // 640x360   30   600
    VIDEO_PROFILE_360P_6 = 35,      // 360x360   30   400
    VIDEO_PROFILE_360P_7 = 36,      // 480x360   15   320
    VIDEO_PROFILE_360P_8 = 37,      // 480x360   30   490
    VIDEO_PROFILE_360P_9 = 38,      // 640x360   15   800
    VIDEO_PROFILE_360P_10 = 39,     // 640x360   24   800
    VIDEO_PROFILE_360P_11 = 100,    // 640x360   24   1000
    VIDEO_PROFILE_480P = 40,        // 640x480   15   500
    VIDEO_PROFILE_480P_3 = 42,      // 480x480   15   400
    VIDEO_PROFILE_480P_4 = 43,      // 640x480   30   750
    VIDEO_PROFILE_480P_6 = 45,      // 480x480   30   600
    VIDEO_PROFILE_480P_8 = 47,		// 848x480   15   610
    VIDEO_PROFILE_480P_9 = 48,		// 848x480   30   930
    VIDEO_PROFILE_480P_10 = 49,		// 640x480   10   400
    VIDEO_PROFILE_720P = 50,        // 1280x720  15   1130
    VIDEO_PROFILE_720P_3 = 52,      // 1280x720  30   1710
    VIDEO_PROFILE_720P_5 = 54,      // 960x720   15   910
    VIDEO_PROFILE_720P_6 = 55,      // 960x720   30   1380
    VIDEO_PROFILE_1080P = 60,       // 1920x1080 15   2080
    VIDEO_PROFILE_1080P_3 = 62,     // 1920x1080 30   3150
    VIDEO_PROFILE_1080P_5 = 64,     // 1920x1080 60   4780
    VIDEO_PROFILE_1440P = 66,       // 2560x1440 30   4850
    VIDEO_PROFILE_1440P_2 = 67,     // 2560x1440 60   7350
    VIDEO_PROFILE_4K = 70,          // 3840x2160 30   8910
    VIDEO_PROFILE_4K_3 = 72,        // 3840x2160 60   13500
    VIDEO_PROFILE_DEFAULT = VIDEO_PROFILE_360P,
};

enum AUDIO_PROFILE_TYPE // sample rate, bit rate, mono/stereo, speech/music codec
{
    AUDIO_PROFILE_DEFAULT = 0, // use default settings
    AUDIO_PROFILE_SPEECH_STANDARD = 1, // 32Khz, 18kbps, mono, speech
    AUDIO_PROFILE_MUSIC_STANDARD = 2, // 48Khz, 50kbps, mono, music
    AUDIO_PROFILE_MUSIC_STANDARD_STEREO = 3, // 48Khz, 50kbps, stereo, music
    AUDIO_PROFILE_MUSIC_HIGH_QUALITY = 4, // 48Khz, 128kbps, mono, music
    AUDIO_PROFILE_MUSIC_HIGH_QUALITY_STEREO = 5, // 48Khz, 128kbps, stereo, music
    AUDIO_PROFILE_NUM = 6,
};

enum AUDIO_SCENARIO_TYPE // set a suitable scenario for your app type
{
    AUDIO_SCENARIO_DEFAULT = 0,
    AUDIO_SCENARIO_CHATROOM = 1,
    AUDIO_SCENARIO_EDUCATION = 2,
    AUDIO_SCENARIO_GAME_STREAMING = 3,
    AUDIO_SCENARIO_SHOWROOM = 4,
    AUDIO_SCENARIO_NUM = 5,
};

enum CHANNEL_PROFILE_TYPE
{
	CHANNEL_PROFILE_COMMUNICATION = 0,
	CHANNEL_PROFILE_LIVE_BROADCASTING = 1,
    CHANNEL_PROFILE_GAME = 2,
};

enum CLIENT_ROLE_TYPE
{
    CLIENT_ROLE_BROADCASTER = 1,
    CLIENT_ROLE_AUDIENCE = 2,
};

enum USER_OFFLINE_REASON_TYPE
{
    USER_OFFLINE_QUIT = 0,
    USER_OFFLINE_DROPPED = 1,
    USER_OFFLINE_BECOME_AUDIENCE = 2,
};

enum REMOTE_VIDEO_STREAM_TYPE
{
    REMOTE_VIDEO_STREAM_HIGH = 0,
    REMOTE_VIDEO_STREAM_LOW = 1,
};

enum RAW_AUDIO_FRAME_OP_MODE_TYPE
{
    RAW_AUDIO_FRAME_OP_MODE_READ_ONLY = 0,
    RAW_AUDIO_FRAME_OP_MODE_WRITE_ONLY = 1,
    RAW_AUDIO_FRAME_OP_MODE_READ_WRITE = 2,
};

struct AudioVolumeInfo
{
    uid_t uid;
    unsigned int volume; // [0,255]
};

struct RtcStats
{
    unsigned int duration;
    unsigned int txBytes;
    unsigned int rxBytes;
    unsigned short txKBitRate;
    unsigned short rxKBitRate;

    unsigned short rxAudioKBitRate;
    unsigned short txAudioKBitRate;

    unsigned short rxVideoKBitRate;
    unsigned short txVideoKBitRate;
    unsigned int users;
    double cpuAppUsage;
    double cpuTotalUsage;
};

struct LocalVideoStats
{
    int sentBitrate;
    int sentFrameRate;
};

struct RemoteVideoStats
{
    uid_t uid;
    int delay;
	int width;
	int height;
	int receivedBitrate;
	int receivedFrameRate;
    REMOTE_VIDEO_STREAM_TYPE rxStreamType;
};

struct VideoCompositingLayout
{
    struct Region {
        uid_t uid;
        double x;//[0,1]
        double y;//[0,1]
        double width;//[0,1]
        double height;//[0,1]
        int zOrder; //optional, [0, 100] //0 (default): bottom most, 100: top most

        //  Optional
        //  [0, 1.0] where 0 denotes throughly transparent, 1.0 opaque
        double alpha;

        RENDER_MODE_TYPE renderMode;//RENDER_MODE_HIDDEN: Crop, RENDER_MODE_FIT: Zoom to fit
        Region()
            :uid(0)
            , x(0)
            , y(0)
            , width(0)
            , height(0)
            , zOrder(0)
            , alpha(1.0)
            , renderMode(RENDER_MODE_HIDDEN)
        {}

    };
    int canvasWidth;
    int canvasHeight;
    const char* backgroundColor;//e.g. "#C0C0C0" in RGB
    const Region* regions;
    int regionCount;
    const char* appData;
    int appDataLength;
    VideoCompositingLayout()
        :canvasWidth(0)
        ,canvasHeight(0)
        ,backgroundColor(NULL)
        ,regions(NULL)
        , regionCount(0)
        , appData(NULL)
        , appDataLength(0)
    {}
};

typedef struct Rect {
    int top;
    int left;
    int bottom;
    int right;

    Rect(): top(0), left(0), bottom(0), right(0) {}
    Rect(int t, int l, int b, int r): top(t), left(l), bottom(b), right(r) {}
} Rect;

#if defined(_WIN32)

enum RTMP_STREAM_LIFE_CYCLE_TYPE
{
	RTMP_STREAM_LIFE_CYCLE_BIND2CHANNEL = 1,
	RTMP_STREAM_LIFE_CYCLE_BIND2OWNER = 2,
};

struct PublisherConfiguration {
	int width;
	int height;
	int framerate;
	int bitrate;
	int defaultLayout;
	int lifecycle;
	bool owner;
	int injectStreamWidth;
	int injectStreamHeight;
	const char* injectStreamUrl;
	const char* publishUrl;
	const char* rawStreamUrl;
	const char* extraInfo;


	PublisherConfiguration()
		: width(640)
		, height(360)
		, framerate(15)
		, bitrate(500)
		, defaultLayout(1)
		, lifecycle(RTMP_STREAM_LIFE_CYCLE_BIND2CHANNEL)
		, owner(true)
		, injectStreamWidth(0)
		, injectStreamHeight(0)
		, injectStreamUrl(NULL)
		, publishUrl(NULL)
		, rawStreamUrl(NULL)
		, extraInfo(NULL)
	{}

};
#endif
#if !defined(__ANDROID__)
struct VideoCanvas
{
    view_t view;
    int renderMode;
    uid_t uid;
    void *priv; // private data (underlying video engine denotes it)

    VideoCanvas()
        : view(NULL)
        , renderMode(RENDER_MODE_HIDDEN)
        , uid(0)
        , priv(NULL)
    {}
    VideoCanvas(view_t v, int m, uid_t u)
        : view(v)
        , renderMode(m)
        , uid(u)
        , priv(NULL)
    {}
};
#else
struct VideoCanvas;
#endif

class IPacketObserver
{
public:

	struct Packet
	{
		const unsigned char* buffer;
		unsigned int size;
	};
	/**
	* called by sdk before the audio packet is sent to other participants
	* @param [in,out] packet
	*      buffer *buffer points the data to be sent
	*      size of buffer data to be sent
	* @return returns true to send out the packet, returns false to discard the packet
	*/
	virtual bool onSendAudioPacket(Packet& packet) = 0;
	/**
	* called by sdk before the video packet is sent to other participants
	* @param [in,out] packet
	*      buffer *buffer points the data to be sent
	*      size of buffer data to be sent
	* @return returns true to send out the packet, returns false to discard the packet
	*/
	virtual bool onSendVideoPacket(Packet& packet) = 0;
	/**
	* called by sdk when the audio packet is received from other participants
	* @param [in,out] packet
	*      buffer *buffer points the data to be sent
	*      size of buffer data to be sent
	* @return returns true to process the packet, returns false to discard the packet
	*/
	virtual bool onReceiveAudioPacket(Packet& packet) = 0;
	/**
	* called by sdk when the video packet is received from other participants
	* @param [in,out] packet
	*      buffer *buffer points the data to be sent
	*      size of buffer data to be sent
	* @return returns true to process the packet, returns false to discard the packet
	*/
	virtual bool onReceiveVideoPacket(Packet& packet) = 0;
};


/**
* the event call back interface
*/
class IRtcEngineEventHandler
{
public:
    virtual ~IRtcEngineEventHandler() {}

    /**
    * when join channel success, the function will be called
    * @param [in] channel
    *        the channel name you have joined
    * @param [in] uid
    *        the UID of you in this channel
    * @param [in] elapsed
    *        the time elapsed in ms from the joinChannel been called to joining completed
    */
    virtual void onJoinChannelSuccess(const char* channel, uid_t uid, int elapsed) {
        (void)channel;
        (void)uid;
        (void)elapsed;
    }

    /**
    * when join channel success, the function will be called
    * @param [in] channel
    *        the channel name you have joined
    * @param [in] uid
    *        the UID of you in this channel
    * @param [in] elapsed
    *        the time elapsed in ms elapsed
    */
    virtual void onRejoinChannelSuccess(const char* channel, uid_t uid, int elapsed) {
        (void)channel;
        (void)uid;
        (void)elapsed;
    }

    /**
    * when warning message coming, the function will be called
    * @param [in] warn
    *        warning code
    * @param [in] msg
    *        the warning message
    */
    virtual void onWarning(int warn, const char* msg) {
        (void)warn;
        (void)msg;
    }

    /**
    * when error message come, the function will be called
    * @param [in] err
    *        error code
    * @param [in] msg
    *        the error message
    */
    virtual void onError(int err, const char* msg) {
        (void)err;
        (void)msg;
    }

    /**
    * when audio quality message come, the function will be called
    * @param [in] uid
    *        the uid of the peer
    * @param [in] quality
    *        the quality of the user, see QUALITY_TYPE for value definition
    * @param [in] delay
    *        the average time of the audio packages delayed
    * @param [in] lost
    *        the rate of the audio packages lost
    */
    virtual void onAudioQuality(uid_t uid, int quality, unsigned short delay, unsigned short lost) {
        (void)uid;
        (void)quality;
        (void)delay;
        (void)lost;
    }

    /**
    * when the audio volume information come, the function will be called
    * @param [in] speakers
    *        the array of the speakers' audio volume information
    * @param [in] speakerNumber
    *        the count of speakers in this array
    * @param [in] totalVolume
    *        the total volume of all users
    */
    virtual void onAudioVolumeIndication(const AudioVolumeInfo* speakers, unsigned int speakerNumber, int totalVolume) {
        (void)speakers;
        (void)speakerNumber;
        (void)totalVolume;
    }

    /**
    * when the audio volume information come, the function will be called
    * @param [in] stats
    *        the statistics of the call
    */
    virtual void onLeaveChannel(const RtcStats& stats) {
        (void)stats;
    }

    /**
    * when the information of the RTC engine stats come, the function will be called
    * @param [in] stats
    *        the RTC engine stats
    */
    virtual void onRtcStats(const RtcStats& stats) {
        (void)stats;
    }

    /**
    * when the audio device state changed(plugged or removed), the function will be called
    * @param [in] deviceId
    *        the ID of the state changed audio device
    * @param [in] deviceType
    *        the type of the audio device(playout device or record device)
    * @param [in] deviceState
    *        the device is been removed or added
    */
    virtual void onAudioDeviceStateChanged(const char* deviceId, int deviceType, int deviceState) {
        (void)deviceId;
        (void)deviceType;
        (void)deviceState;
    }

    /**
     * When audio mixing file playback finished, this function will be called
     */
    virtual void onAudioMixingFinished() {
    }

    /**
     * When far-end rhythm begins/ends, these functions will be called
     */
    virtual void onRemoteAudioMixingBegin() {
    }
    virtual void onRemoteAudioMixingEnd() {
    }

    /**
    * When audio effect playback finished, this function will be called
    */
    virtual void onAudioEffectFinished(int soundId) {
    }

    /**
    * when the video device state changed(plugged or removed), the function will be called
    * @param [in] deviceId
    *        the ID of the state changed video device
    * @param [in] deviceType
    *        not used
    * @param [in] deviceState
    *        the device is been removed or added
    */
    virtual void onVideoDeviceStateChanged(const char* deviceId, int deviceType, int deviceState) {
        (void)deviceId;
        (void)deviceType;
        (void)deviceState;
    }

    /**
    * report the network quality
	* @param [in] uid
	*        the UID of the remote user
	* @param [in] txQuality
    *        the score of the send network quality 0~5 the higher the better
	* @param [in] rxQuality
	*        the score of the recv network quality 0~5 the higher the better
	*/
    virtual void onNetworkQuality(uid_t uid, int txQuality, int rxQuality) {
		(void)uid;
		(void)txQuality;
		(void)rxQuality;
    }

    /**
    * report the last-mile test network quality
    * @param [in] quality
    *        the score of the network quality 0~5 the higher the better
    */
    virtual void onLastmileQuality(int quality) {
        (void)quality;
    }

    /**
    * when the first local video frame displayed, the function will be called
    * @param [in] width
    *        the width of the video frame
    * @param [in] height
    *        the height of the video frame
    * @param [in] elapsed
    *        the time elapsed from channel joined in ms
    */
    virtual void onFirstLocalVideoFrame(int width, int height, int elapsed) {
        (void)width;
        (void)height;
        (void)elapsed;
    }

    /**
    * when the first remote video frame decoded, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] width
    *        the width of the video frame
    * @param [in] height
    *        the height of the video frame
    * @param [in] elapsed
    *        the time elapsed from channel joined in ms
    */
    virtual void onFirstRemoteVideoDecoded(uid_t uid, int width, int height, int elapsed) {
        (void)uid;
        (void)width;
        (void)height;
        (void)elapsed;
    }

    /**
     * when video size changed or rotation changed, the function will be called
     * @param [in] uid
     *        the UID of the remote user or local user (0)
     * @param [in] width
     *        the new width of the video
     * @param [in] height
     *        the new height of the video
     * @param [in] rotation
     *        the rotation of the video
     */
    virtual void onVideoSizeChanged(uid_t uid, int width, int height, int rotation) {
        (void)uid;
        (void)width;
        (void)height;
        (void)rotation;
    }

    /**
    * when the first remote video frame displayed, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] width
    *        the width of the video frame
    * @param [in] height
    *        the height of the video frame
    * @param [in] elapsed
    *        the time elapsed from remote user called joinChannel in ms
    */
    virtual void onFirstRemoteVideoFrame(uid_t uid, int width, int height, int elapsed) {
        (void)uid;
        (void)width;
        (void)height;
        (void)elapsed;
    }

    /**
    * when any other user joined in the same channel, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] elapsed
    *        the time elapsed from remote used called joinChannel to joining completed in ms
    */
    virtual void onUserJoined(uid_t uid, int elapsed) {
        (void)uid;
        (void)elapsed;
    }

    /**
    * when user offline(exit channel or offline by accident), the function will be called
    * @param [in] uid
    *        the UID of the remote user
    */
    virtual void onUserOffline(uid_t uid, USER_OFFLINE_REASON_TYPE reason) {
        (void)uid;
        (void)reason;
    }

    /**
    * when remote user muted the audio stream, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] muted
    *        true: the remote user muted the audio stream, false: the remote user unmuted the audio stream
    */
    virtual void onUserMuteAudio(uid_t uid, bool muted) {
        (void)uid;
        (void)muted;
    }

    /**
    * when remote user muted the video stream, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] muted
    *        true: the remote user muted the video stream, false: the remote user unmuted the video stream
    */
    virtual void onUserMuteVideo(uid_t uid, bool muted) {
        (void)uid;
        (void)muted;
    }

	/**
	* when remote user enable video function, the function will be called
	* @param [in] uid
	*        the UID of the remote user
	* @param [in] enabled
	*        true: the remote user has enabled video function, false: the remote user has disabled video function
	*/
	virtual void onUserEnableVideo(uid_t uid, bool enabled) {
		(void)uid;
		(void)enabled;
	}
	
    /**
    * when remote user enable local video function, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] enabled
    *        true: the remote user has enabled local video function, false: the remote user has disabled local video function
    */
    virtual void onUserEnableLocalVideo(uid_t uid, bool enabled) {
        (void)uid;
        (void)enabled;
    }
    
    /**
    * when api call executed completely, the function will be called
    * @param [in] api
    *        the api name
    * @param [in] error
    *        error code while 0 means OK
    */
    virtual void onApiCallExecuted(const char* api, int error) {
        (void)api;
        (void)error;
    }

    /**
	* reported local video stats
	* @param [in] stats
    *        the latest local video stats
    */
	virtual void onLocalVideoStats(const LocalVideoStats& stats) {
		(void)stats;
    }

    /**
    * reported remote video stats
    * @param [in] stats
	*        the latest remote video stats
	*/
	virtual void onRemoteVideoStats(const RemoteVideoStats& stats) {
		(void)stats;
    }

    /**
    * when the camera is ready to work, the function will be called
    */
    virtual void onCameraReady() {}

    /**
    * when all video stopped, the function will be called then you can repaint the video windows
    */
    virtual void onVideoStopped() {}

    /**
    * when the network can not worked well, the function will be called
    */
    virtual void onConnectionLost() {}

    /**
    * when local user disconnected by accident, the function will be called(then SDK will try to reconnect itself)
    */
    virtual void onConnectionInterrupted() {}

    /**
     * when local user is banned by the server, the function will be called
     */
    virtual void onConnectionBanned() {}
    
    virtual void onRefreshRecordingServiceStatus(int status) {
        (void)status;
    }

//    virtual void onStreamError(int streamId, int code, int parameter, const char* message, size_t length) {}
    /**
    * when stream message received, the function will be called
    * @param [in] uid
    *        UID of the peer who sends the message
    * @param [in] streamId
    *        APP can create multiple streams for sending messages of different purposes
    * @param [in] data
    *        the message data
    * @param [in] length
    *        the message length, in bytes
    *        frame rate
    */
    virtual void onStreamMessage(uid_t uid, int streamId, const char* data, size_t length) {
        (void)uid;
        (void)streamId;
        (void)data;
        (void)length;
    }

	/**
	* 
	*/
	virtual void onStreamMessageError(uid_t uid, int streamId, int code, int missed, int cached) {
        (void)uid;
        (void)streamId;
        (void)code;
        (void)missed;
        (void)cached;
    }

    virtual void onMediaEngineLoadSuccess() {
    }
    virtual void onMediaEngineStartCallSuccess() {
    }
    /**
    * when channel key is enabled, and specified channel key is invalid or expired, this function will be called.
    * APP should generate a new channel key and call renewChannelKey() to refresh the key.
    * NOTE: to be compatible with previous version, ERR_CHANNEL_KEY_EXPIRED and ERR_INVALID_CHANNEL_KEY are also reported via onError() callback.
    * You should move renew of channel key logic into this callback.
    */
    virtual void onRequestChannelKey() {
    }

    /**
    * when the first local audio frame generated, the function will be called
    * @param [in] elapsed
    *        the time elapsed from remote user called joinChannel in ms
    */
    virtual void onFirstLocalAudioFrame(int elapsed) {
        (void)elapsed;
    }

    /**
    * when the first remote audio frame arrived, the function will be called
    * @param [in] uid
    *        the UID of the remote user
    * @param [in] elapsed
    *        the time elapsed from remote user called joinChannel in ms
    */
    virtual void onFirstRemoteAudioFrame(uid_t uid, int elapsed) {
        (void)uid;
        (void)elapsed;
    }
    /** @param [in] uid
    *        the speaker uid who is talking in the channel
    */
    virtual void onActiveSpeaker(uid_t uid) {
        (void)uid;
    }

    /**
    * when client role is successfully changed, the function will be called
    */
    virtual void onClientRoleChanged(CLIENT_ROLE_TYPE oldRole, CLIENT_ROLE_TYPE newRole) {
    }

    virtual void onAudioDeviceVolumeChanged(MEDIA_DEVICE_TYPE deviceType, int volume, bool muted) {
        (void)deviceType;
        (void)volume;
        (void)muted;
    }

    virtual void onSendSEI(char** info, int* len){
        (void)info;
        (void)len;
    }
   
    virtual void onReceiveSEI(const char* info, int len){
        (void)info;
        (void)len;
    }
};

/**
* the video device collection interface
*/
class IVideoDeviceCollection
{
public:
    /**
    * get the audio device count
    * @return returns the audio device count
    */
    virtual int getCount() = 0;

    /**
    * get audio device information
    * @param [in] index
    *        the index of the device in the device list
    * @param [in, out] deviceName
    *        the device name, UTF8 format
    * @param [in, out] deviceId
    *        the device ID, UTF8 format
    * @return return 0 if success or an error code
    */
    virtual int getDevice(int index, char deviceName[MAX_DEVICE_ID_LENGTH], char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * set current active audio device
    * @param [in] deviceId
    *        the deviceId of the device you want to active currently
    * @return return 0 if success or an error code
    */
    virtual int setDevice(const char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * release the resource
    */
    virtual void release() = 0;
};

class IVideoDeviceManager
{
public:

    /**
    * create the IVideoDeviceCollection interface pointer
    * @return return the IVideoDeviceCollection interface or nullptr if failed
    */
    virtual IVideoDeviceCollection* enumerateVideoDevices() = 0;

    /**
    * active the video device for current using
    * @param [in] deviceId
    *        the deviceId of the device you want to active currently
    * @return return 0 if success or the error code.
    */
    virtual int setDevice(const char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * get the current active video device
    * @param [in, out] deviceId
    *        the device id of the current active video device
    * @return return 0 if success or an error code
    */
    virtual int getDevice(char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * test the video capture device to know whether it can worked well
    * @param [in] hwnd
    *        the HWND of the video-display window
    * @return return 0 if success or an error code
    */
    virtual int startDeviceTest(view_t hwnd) = 0;

    /**
    * stop the video device testing
    * @return return 0 if success or an error code
    */
    virtual int stopDeviceTest() = 0;

    /**
    * release the resource
    */
    virtual void release() = 0;
};

class IAudioDeviceCollection
{
public:
    /**
    * get the available devices count
    * @return return the device count
    */
    virtual int getCount() = 0;

    /**
    * get video device information
    * @param [in] index
    *        the index of the device in the device list
    * @param [in, out] deviceName
    *        the device name, UTF8 format
    * @param [in, out] deviceId
    *        the device ID, UTF8 format
    * @return return 0 if success or an error code
    */
    virtual int getDevice(int index, char deviceName[MAX_DEVICE_ID_LENGTH], char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * active the device for current using
    * @param [in] deviceId
    *        the deviceId of the device you want to active currently
    * @return return 0 if success or the error code.
    */
    virtual int setDevice(const char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    virtual int setApplicationVolume(int volume) = 0;
    virtual int getApplicationVolume(int& volume) = 0;
    virtual int setApplicationMute(bool mute) = 0;
    virtual int isApplicationMute(bool& mute) = 0;
    /**
    * release the resource
    */
    virtual void release() = 0;
};

class IAudioDeviceManager
{
public:
    /**
    * create the IAudioDeviceCollection interface pointer of the playback devices
    * @return return the IVideoDeviceCollection interface or nullptr if failed
    */
    virtual IAudioDeviceCollection* enumeratePlaybackDevices() = 0;

    /**
    * create the IAudioDeviceCollection interface pointer of the Recording devices
    * @return return the IVideoDeviceCollection interface or nullptr if failed
    */
    virtual IAudioDeviceCollection* enumerateRecordingDevices() = 0;

    /**
    * active the playback device for current using
    * @param [in] deviceId
    *        the deviceId of the playback device you want to active currently
    * @return return 0 if success or the error code.
    */
    virtual int setPlaybackDevice(const char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * get the current active playback device
    * @param [in, out] deviceId
    *        the device id of the current active video device
    * @return return 0 if success or an error code
    */
    virtual int getPlaybackDevice(char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * set current playback device volume
    * @param [in] volume
    *        the volume you want to set 0-255
    * @return return 0 if success or an error code
    */
    virtual int setPlaybackDeviceVolume(int volume) = 0;

    /**
    * get current playback device volume
    * @param [in, out] volume
    *        the current playback device volume 0-255
    * @return return 0 if success or an error code
    */
    virtual int getPlaybackDeviceVolume(int *volume) = 0;

    /**
    * active the recording audio device for current using
    * @param [in] deviceId
    *        the deviceId of the recording audio device you want to active currently
    * @return return 0 if success or the error code.
    */
    virtual int setRecordingDevice(const char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * get the current active recording device
    * @param [in, out] deviceId
    *        the device id of the current active recording audio device
    * @return return 0 if success or an error code
    */
    virtual int getRecordingDevice(char deviceId[MAX_DEVICE_ID_LENGTH]) = 0;

    /**
    * set current recording device volume
    * @param [in] volume
    *        the volume you want to set 0-255
    * @return return 0 if success or an error code
    */
    virtual int setRecordingDeviceVolume(int volume) = 0;

    /**
    * get current recording device volume
    * @param [in, out] volume
    *        the current recording device volume 0-255
    * @return return 0 if success or an error code
    */
    virtual int getRecordingDeviceVolume(int *volume) = 0;
  
    virtual int setPlaybackDeviceMute(bool mute) = 0;
    virtual int getPlaybackDeviceMute(bool *mute) = 0;
    virtual int setRecordingDeviceMute(bool mute) = 0;
    virtual int getRecordingDeviceMute(bool *mute) = 0;

    /**
    * test the playback audio device to know whether it can worked well
    * @param [in] testAudioFilePath
    *        the path of the .wav file
    * @return return 0 if success and you can hear the sound of the .wav file or an error code.
    */
    virtual int startPlaybackDeviceTest(const char* testAudioFilePath) = 0;

    /**
    * stop the playback audio device testing
    * @return return 0 if success or an error code
    */
    virtual int stopPlaybackDeviceTest() = 0;

    /**
    * test the recording audio device to know whether it can worked well
    * @param [in] indicationInterval
    *        the period in ms of the call back cycle
    * @return return 0 if success or an error code
    */
    virtual int startRecordingDeviceTest(int indicationInterval) = 0;

    /**
    * stop the recording audio device testing
    * @return return 0 if success or an error code
    */
    virtual int stopRecordingDeviceTest() = 0;

    /**
    * release the resource
    */
    virtual void release() = 0;
};

struct RtcEngineContext
{
    IRtcEngineEventHandler* eventHandler;
    const char* appId;
    RtcEngineContext()
    :eventHandler(NULL)
    ,appId(NULL)
    {}
};


class IRtcEngine
{
public:
    /**
    * release the engine resource
    * @param [in] sync
    *        true: release the engine resources and return after all resources have been destroyed.
    *              APP should try not to call release(true) in the engine's callbacks, call it this way in a separate thread instead.
    *        false: notify engine to release its resources and returns without waiting for resources are really destroyed
    */
    virtual void release(bool sync=false) = 0;
	
	/**
    * initialize the engine
    * @param [in] context
    *        the RTC engine context
    * @return return 0 if success or an error code
    */
    virtual int initialize(const RtcEngineContext& context) = 0;

    /**
    * get the pointer of the device manager object.
    * @param [in] iid
    *        the iid of the interface you want to get
    * @param [in, out] inter
    *       the pointer of the pointer you want to point to DeviceManager object
    * @return return 0 if success or an error code
    */
    virtual int queryInterface(INTERFACE_ID_TYPE iid, void** inter) = 0;

    /**
    * get the version information of the SDK
    * @param [in, out] build
    *        the build number
    * @return return the version number string in char format
    */
    virtual const char* getVersion(int* build) = 0;

    /**
    * get the version information of the SDK
    * @param [in, out] code
    *        the build number
    * @return return the version number string in char format
    */
    virtual const char* getErrorDescription(int code) = 0;

    /**
    * join the channel, if the channel have not been created, it will been created automatically
  * @param [in] channelKey
    *        the channel key, if you have initialized the engine with an available APP ID, it can be null here. If you enable channel key on the dashboard, specify channel key here
    * @param [in] channelName
    *        the channel name
  * @param [in] info
    *        the additional information, it can be null here
    * @param [in] uid
    *        the uid of you, if 0 the system will automatically allocate one for you
    * @return return 0 if success or an error code
    */
    virtual int joinChannel(const char* channelKey, const char* channelName, const char* info, uid_t uid) = 0;

    /**
    * leave the current channel
    * @return return 0 if success or an error code
    */
    virtual int leaveChannel() = 0;

    /**
    * renew the channel key for the current channel
    * @param [in] channelKey the renewed channel key, if old channel key expired.
    * @return return 0 if success or an error code
    */
    virtual int renewChannelKey(const char* channelKey) = 0;

    virtual int setChannelProfile(CHANNEL_PROFILE_TYPE profile) = 0;
    virtual int setClientRole(CLIENT_ROLE_TYPE role, const char* permissionKey) = 0;

    /**
    * start the echo testing, if every thing goes well you can hear your echo from the server
    * @return return 0 if success or an error code
    */
    virtual int startEchoTest() = 0;

    /**
    * stop the echo testing
    * @return return 0 if success or an error code
    */
    virtual int stopEchoTest() = 0;

    /**
    * start the network testing
    * @return return 0 if success or an error code
    */
    virtual int enableLastmileTest() = 0;

    /**
    * stop the network testing
    * @return return 0 if success or an error code
    */
    virtual int disableLastmileTest() = 0;

    /**
    * enable video function
    * @return return 0 if success or an error code
    */
    virtual int enableVideo() = 0;

    /**
    * disable video function
    * @return return 0 if success or an error code
    */
    virtual int disableVideo() = 0;

    /**
    * start the local video previewing
    * @return return 0 if success or an error code
    */
    virtual int startPreview() = 0;

    /**
    * stop the local video previewing
    * @return return 0 if success or an error code
    */
    virtual int stopPreview() = 0;

    virtual int setVideoProfile(VIDEO_PROFILE_TYPE profile, bool swapWidthAndHeight) = 0;
    /**
    * set the remote video canvas
    * @param [in] canvas
    *        the canvas information
    * @return return 0 if success or an error code
    */
    virtual int setupRemoteVideo(const VideoCanvas& canvas) = 0;

    /**
    * set the local video canvas
    * @param [in] canvas
    *        the canvas information
    * @return return 0 if success or an error code
    */
    virtual int setupLocalVideo(const VideoCanvas& canvas) = 0;

    /**
    * enable audio function, which is enabled by deault.
    * @return return 0 if success or an error code
    */
    virtual int enableAudio() = 0;

    /**
    * disable audio function
    * @return return 0 if success or an error code
    */
    virtual int disableAudio() = 0;

    virtual int setAudioProfile(AUDIO_PROFILE_TYPE profile, AUDIO_SCENARIO_TYPE scenario) = 0;

    /**
    * get self call id in the current channel
    * @param [in, out] callId
    *        the self call Id
    * @return return 0 if success or an error code
    */
    virtual int getCallId(agora::util::AString& callId) = 0;

    virtual int rate(const char* callId, int rating, const char* description) = 0; // 0~10
    virtual int complain(const char* callId, const char* description) = 0;

    /**
    * register a packet observer while the packet arrived or ready to be sent, the observer can touch the packet data
    * @param [in] observer
    *        the pointer of the observer object
    * @return return 0 if success or an error code
    */
    virtual int registerPacketObserver(IPacketObserver* observer) = 0;

	/**
	* Specify encryption mode of AES encryption algorithm.
	* @param [in] encryptionMode
	*        encryption mode of AES algorithm, could be one of the following:
	*          "aes-128-xts", "aes-256-xts".
	*          The default value is "aes-128-xts". specify NULL value will use default encryption mode.
	* @return return 0 if success or an error code
	*/
	virtual int setEncryptionMode(const char* encryptionMode) = 0;
	/**
	* Specify encryption secret enables built-in encryption function. Leaving channel will clear the secret specified in last channel
	* @param [in] secret
	*        secret to enable encryption
	* @return return 0 if success or an error code
	*/
	virtual int setEncryptionSecret(const char* secret) = 0;

    virtual int createDataStream(int* streamId, bool reliable, bool ordered) = 0;
    virtual int sendStreamMessage(int streamId, const char* data, size_t length) = 0;

    virtual int setVideoCompositingLayout(const VideoCompositingLayout& sei) = 0;
    virtual int clearVideoCompositingLayout() = 0;

#if defined(_WIN32)
	virtual int configPublisher(const PublisherConfiguration& config) = 0;
#endif
};


class IRtcEngineParameter
{
public:
    /**
    * release the resource
    */
    virtual void release() = 0;

    /**
    * set bool value of the json
    * @param [in] key
    *        the key name
    * @param [in] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int setBool(const char* key, bool value) = 0;

    /**
    * set int value of the json
    * @param [in] key
    *        the key name
    * @param [in] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int setInt(const char* key, int value) = 0;

    /**
    * set unsigned int value of the json
    * @param [in] key
    *        the key name
    * @param [in] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int setUInt(const char* key, unsigned int value) = 0;

    /**
    * set double value of the json
    * @param [in] key
    *        the key name
    * @param [in] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int setNumber(const char* key, double value) = 0;

    /**
    * set string value of the json
    * @param [in] key
    *        the key name
    * @param [in] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int setString(const char* key, const char* value) = 0;

    /**
    * set object value of the json
    * @param [in] key
    *        the key name
    * @param [in] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int setObject(const char* key, const char* value) = 0;

    /**
    * get bool value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getBool(const char* key, bool& value) = 0;

    /**
    * get int value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getInt(const char* key, int& value) = 0;

    /**
    * get unsigned int value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getUInt(const char* key, unsigned int& value) = 0;

    /**
    * get double value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getNumber(const char* key, double& value) = 0;

    /**
    * get string value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getString(const char* key, agora::util::AString& value) = 0;

    /**
    * get a child object value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getObject(const char* key, agora::util::AString& value) = 0;

    /**
    * get array value of the json
    * @param [in] key
    *        the key name
    * @param [in, out] value
    *        the value
    * @return return 0 if success or an error code
    */
    virtual int getArray(const char* key, agora::util::AString& value) = 0;

    /**
    * set parameters of the sdk or engine
    * @param [in] parameters
    *        the parameters
    * @return return 0 if success or an error code
    */
    virtual int setParameters(const char* parameters) = 0;

    /**
    * set profile to control the RTC engine
    * @param [in] profile
    *        the profile
    * @param [in] merge
    *        if merge with the original value
    * @return return 0 if success or an error code
    */
    virtual int setProfile(const char* profile, bool merge) = 0;

	virtual int convertPath(const char* filePath, agora::util::AString& value) = 0;
};

class AAudioDeviceManager : public agora::util::AutoPtr<IAudioDeviceManager>
{
public:
    AAudioDeviceManager(IRtcEngine* engine)
    {
		queryInterface(engine, AGORA_IID_AUDIO_DEVICE_MANAGER);
    }
};

class AVideoDeviceManager : public agora::util::AutoPtr<IVideoDeviceManager>
{
public:
    AVideoDeviceManager(IRtcEngine* engine)
    {
		queryInterface(engine, AGORA_IID_VIDEO_DEVICE_MANAGER);
    }
};

class AParameter : public agora::util::AutoPtr<IRtcEngineParameter>
{
public:
    AParameter(IRtcEngine& engine) { initialize(&engine); }
    AParameter(IRtcEngine* engine) { initialize(engine); }
    AParameter(IRtcEngineParameter* p) :agora::util::AutoPtr<IRtcEngineParameter>(p) {}
private:
    bool initialize(IRtcEngine* engine)
    {
        IRtcEngineParameter* p = NULL;
        if (engine && !engine->queryInterface(AGORA_IID_RTC_ENGINE_PARAMETER, (void**)&p))
            reset(p);
        return p != NULL;
    }
};

class RtcEngineParameters
{
public:
    RtcEngineParameters(IRtcEngine& engine)
        :m_parameter(&engine){}
    RtcEngineParameters(IRtcEngine* engine)
        :m_parameter(engine){}

    /**
    * mute/unmute the local stream capturing
    * @param [in] mute
    *        true:  mute
    *       false: unmute
    * @return return 0 if success or an error code
    */
    int muteLocalAudioStream(bool mute) {
        return setParameters("{\"rtc.audio.mute_me\":%s,\"che.audio.mute_me\":%s}", mute ? "true" : "false", mute ? "true" : "false");
    }
    // mute/unmute all peers. unmute will clear all muted peers specified mutePeer() interface
  /**
    * mute/unmute all the remote audio stream receiving
    * @param [in] mute
    *        true:  mute
    *       false: unmute
    * @return return 0 if success or an error code
    */
    int muteAllRemoteAudioStreams(bool mute) {
        return m_parameter ? m_parameter->setBool("rtc.audio.mute_peers", mute) : -ERR_NOT_INITIALIZED;
    }

    /**
    * mute/unmute one remote audio stream receiving
    * @param [in] uid
    *        the uid of the remote user you want to mute/unmute
    * @param [in] mute
    *        true:  mute
    *       false: unmute
    * @return return 0 if success or an error code
    */
    int muteRemoteAudioStream(uid_t uid, bool mute) {
        return setObject("rtc.audio.mute_peer", "{\"uid\":%u,\"mute\":%s}", uid, mute?"true":"false");
    }

    /**
    * mute/unmute local video stream sending
    * @param [in] mute
    *        true:  mute
    *       false: unmute
    * @return return 0 if success or an error code
    */
    int muteLocalVideoStream(bool mute) {
        return setParameters("{\"rtc.video.mute_me\":%s,\"che.video.local.send\":%s}", mute ? "true" : "false", mute ? "false" : "true");
    }
	
	int enableLocalVideo(bool enabled) {
		return setParameters("{\"rtc.video.capture\":%s,\"che.video.local.capture\":%s,\"che.video.local.render\":%s,\"che.video.local.send\":%s}", enabled ? "true" : "false", enabled ? "true" : "false", enabled ? "true" : "false", enabled ? "true" : "false");
	}
    /**
    * mute/unmute all the remote video stream receiving
    * @param [in] mute
    *        true:  mute
    *       false: unmute
    * @return return 0 if success or an error code
    */
    int muteAllRemoteVideoStreams(bool mute) {
        return m_parameter ? m_parameter->setBool("rtc.video.mute_peers", mute) : -ERR_NOT_INITIALIZED;
    }

    /**
    * mute/unmute one remote video stream receiving
    * @param [in] uid
    *        the uid of the remote user you want to mute/unmute
    * @param [in] mute
    *        true:  mute
    *       false: unmute
    * @return return 0 if success or an error code
    */
    int muteRemoteVideoStream(uid_t uid, bool mute) {
        return setObject("rtc.video.mute_peer", "{\"uid\":%u,\"mute\":%s}", uid, mute ? "true" : "false");
    }

    int setRemoteVideoStreamType(uid_t uid, REMOTE_VIDEO_STREAM_TYPE streamType) {
        return setParameters("{\"rtc.video.set_remote_video_stream\":{\"uid\":%u,\"stream\":%d}, \"che.video.setstream\":{\"uid\":%u,\"stream\":%d}}", uid, streamType, uid, streamType);
//        return setObject("rtc.video.set_remote_video_stream", "{\"uid\":%u,\"stream\":%d}", uid, streamType);
    }

    int setRemoteDefaultVideoStreamType(REMOTE_VIDEO_STREAM_TYPE streamType) {
        return m_parameter ? m_parameter->setInt("rtc.video.set_remote_default_video_stream_type", streamType) : -ERR_NOT_INITIALIZED;
    }

    /**
    * set play sound volume
    * @param [in] volume
    *        the volume 0~255
    * @return return 0 if success or an error code
    */
    int setPlaybackDeviceVolume(int volume) {// [0,255]
        return m_parameter ? m_parameter->setInt("che.audio.output.volume", volume) : -ERR_NOT_INITIALIZED;
    }

    /**
    * enable or disable the audio volume indication
    * @param [in] interval
    *        the period of the call back cycle, in ms
    *        interval <= 0: disable
    *        interval >  0: enable
    * @param [in] smooth
    *        the smooth parameter
    * @return return 0 if success or an error code
    */
    int enableAudioVolumeIndication(int interval, int smooth) { // in ms: <= 0: disable, > 0: enable, interval in ms
        if (interval < 0)
            interval = 0;
        return setObject("che.audio.volume_indication", "{\"interval\":%d,\"smooth\":%d}", interval, smooth);
    }

    /**
    * start recording the audio stream
    * @param [in] filePath
    *        the .wav file path you want to saved
    * @return return 0 if success or an error code
    */
    int startAudioRecording(const char* filePath, AUDIO_RECORDING_QUALITY_TYPE quality) {
        if (!m_parameter) return -ERR_NOT_INITIALIZED;
#if defined(_WIN32)
        util::AString path;
        if (!m_parameter->convertPath(filePath, path))
            filePath = path->c_str();
        else
            return -ERR_INVALID_ARGUMENT;
#endif
        return setObject("che.audio.start_recording", "{\"filePath\":\"%s\",\"quality\":%d}", filePath, quality);
    }

    /**
    * stop recording the audio stream
    * @return return 0 if success or an error code
    */
    int stopAudioRecording() {
        return m_parameter ? m_parameter->setBool("che.audio.stop_recording", true) : -ERR_NOT_INITIALIZED;
    }

	/**
	* mix microphone and local audio file into the audio stream
	* @param [in] filePath
	*        specify the path and file name of the audio file to be played
	* @param [in] loopback
	*        specify if local and remote participant can hear the audio file.
	*        false (default): both local and remote party can hear the the audio file
	*        true: only the local party can hear the audio file
	* @param [in] replace
	*        false (default): mix the local microphone captured voice with the audio file
	*        true: replace the microphone captured voice with the audio file
	* @param [in] cycle
	*        specify the number of cycles to play
	*        -1, infinite loop playback
	* @return return 0 if success or an error code
	*/
	int startAudioMixing(const char* filePath, bool loopback, bool replace, int cycle) {
        if (!m_parameter) return -ERR_NOT_INITIALIZED;
#if defined(_WIN32)
		util::AString path;
		if (!m_parameter->convertPath(filePath, path))
			filePath = path->c_str();
		else
			return -ERR_INVALID_ARGUMENT;
#endif
		return setObject("che.audio.start_file_as_playout", "{\"filePath\":\"%s\",\"loopback\":%s,\"replace\":%s,\"cycle\":%d}",
					filePath,
					loopback?"true":"false",
					replace?"true":"false",
					cycle);
	}
	/**
	* stop mixing the local audio stream
	* @return return 0 if success or an error code
	*/
	int stopAudioMixing() {
        return m_parameter ? m_parameter->setBool("che.audio.stop_file_as_playout", true) : -ERR_NOT_INITIALIZED;
	}

    int pauseAudioMixing() {
        return m_parameter ? m_parameter->setBool("che.audio.pause_file_as_playout", true) : -ERR_NOT_INITIALIZED;
    }

    int resumeAudioMixing() {
        return m_parameter ? m_parameter->setBool("che.audio.pause_file_as_playout", false) : -ERR_NOT_INITIALIZED;
    }

    int adjustAudioMixingVolume(int volume) {
        return m_parameter ? m_parameter->setInt("che.audio.set_file_as_playout_volume", volume) : -ERR_NOT_INITIALIZED;
    }
    int getAudioMixingDuration() {
        int duration = 0;
        int r = m_parameter ? m_parameter->getInt("che.audio.get_mixing_file_length_ms", duration) : -ERR_NOT_INITIALIZED;
        if (r == 0)
            r = duration;
        return r;
    }
    int getAudioMixingCurrentPosition() {
        if (!m_parameter) return -ERR_NOT_INITIALIZED;
        int pos = 0;
        int r = m_parameter->getInt("che.audio.get_mixing_file_played_ms", pos);
        if (r == 0)
            r = pos;
        return r;
    }
    int setAudioMixingPosition(int pos /*in ms*/) {
        return m_parameter ? m_parameter->setInt("che.audio.mixing.file.position", pos) : -ERR_NOT_INITIALIZED;
    }
    /**
     * Change the pitch of local speaker's voice
     * @param [in] pitch
     *        frequency, in the range of [0.5..2.0], default value is 1.0
     *
     * @return return 0 if success or an error code
     */
    int setLocalVoicePitch(double pitch) {
        return m_parameter ? m_parameter->setInt(
            "che.audio.game_local_pitch_shift",
            static_cast<int>(pitch * 100)) : -ERR_NOT_INITIALIZED;
    }
    /**
     * Set the audio ears back's volume and effect
     * @param [in] volume
     *        set volume of audio ears back, in the range of [0..100], default value is 100
     *
     * @return return 0 if success or an error code
     */
    int setInEarMonitoringVolume(int volume) {
        return m_parameter ? m_parameter->setInt("che.audio.headset.monitoring.parameter", volume) : -ERR_NOT_INITIALIZED;
    }
    /**
     *  set audio profile and scenario
     *  including sample rate, bit rate, mono/stereo, speech/music codec
     *
     *  @param [in] profile
     *              enumeration definition about the audio's samplerate, bitrate, mono/stereo, speech/music codec
     *  @param [in] scenario
     *              enumeration definition about the audio scenario
     *
     *  @return 0 when executed successfully. return negative value if failed.
     */
    int setAudioProfile(AUDIO_PROFILE_TYPE profile, AUDIO_SCENARIO_TYPE scenario) {
        return setObject(
            "che.audio.profile",
            "{\"config\":%d,\"scenario\":%d}",
            static_cast<int>(profile), static_cast<int>(scenario));
    }

    /**
     * disable audio function in channel, which will be recovered when leave channel.
     * @return return 0 if success or an error code
     */
    int pauseAudio() {
        return m_parameter ? m_parameter->setBool("che.pause.audio", true) : -ERR_NOT_INITIALIZED;
    }

    /**
     * resume audio function in channel.
     * @return return 0 if success or an error code
     */
    int resumeAudio() {
        return m_parameter ? m_parameter->setBool("che.pause.audio", false) : -ERR_NOT_INITIALIZED;
    }

    int setExternalAudioSource(bool enabled, int sampleRate, int channels) {
        if (enabled)
            return setParameters("{\"che.audio.external_capture\":true,\"che.audio.external_capture.push\":true,\"che.audio.set_capture_raw_audio_format\":{\"sampleRate\":%d,\"channelCnt\":%d,\"mode\":%d}}", sampleRate, channels, RAW_AUDIO_FRAME_OP_MODE_TYPE::RAW_AUDIO_FRAME_OP_MODE_READ_WRITE);
        else
            return setParameters("{\"che.audio.external_capture\":false,\"che.audio.external_capture.push\":false}");
    }
#if defined(__APPLE__)
    /**
     * start screen/windows capture
     *
     *  @param windowId screen capture, if windowId is 0; windows capture if windowsId isn't 0;
     *  @param rect     valid when windowId is 0; whole screen if rect is NULL.
     *
     *  @return return 0 if success or an error code
     */
    int startScreenCapture(unsigned int windowId, int captureFreq, const Rect *rect) {
        if (!rect)
            return setObject("che.video.start_screen_capture", "{\"id\":%u,\"captureFreq\":%d}", windowId, captureFreq);
        else
            return setObject("che.video.start_screen_capture", "{\"id\":%u,\"captureFreq\":%d,\"top\":%d,\"left\":%d,\"bottom\":%d,\"right\":%d}", windowId, captureFreq, rect->top, rect->left, rect->bottom, rect->right);
    }

    /**
     * stop screen capture
     * @return return 0 if success or an error code
     */
    int stopScreenCapture() {
        return m_parameter ? m_parameter->setBool("che.video.stop_screen_capture", true) : -ERR_NOT_INITIALIZED;
    }

    /**
    * update screen capture region
    *
    *  @param rect     valid when windowId is 0; whole screen if rect is NULL.
    *
    *  @return return 0 if success or an error code
    */
    int updateScreenCaptureRegion(const Rect *rect) {
      if (!rect)
        return setObject("che.video.update_screen_capture_region", "{}");
      else
        return setObject("che.video.update_screen_capture_region", "{\"top\":%d,\"left\":%d,\"bottom\":%d,\"right\":%d}", rect->top, rect->left, rect->bottom, rect->right);
    }
#elif defined(_WIN32)
    /**
     * start screen/windows capture
     *
     *  @param windowId screen capture, if windowId is 0; windows capture if windowsId isn't 0;
     *  @param rect     valid when windowId is 0; whole screen if rect is NULL.
     *
     *  @return return 0 if success or an error code
     */
    int startScreenCapture(HWND windowId, int captureFreq, const Rect *rect) {
        if (!rect)
            return setObject("che.video.start_screen_capture", "{\"id\":%u,\"captureFreq\":%d}", (unsigned int)windowId, captureFreq);
        else
            return setObject("che.video.start_screen_capture", "{\"id\":%u,\"captureFreq\":%d,\"top\":%d,\"left\":%d,\"bottom\":%d,\"right\":%d}", (unsigned int)windowId, captureFreq, rect->top, rect->left, rect->bottom, rect->right);
    }

    /**
     * stop screen capture
     * @return return 0 if success or an error code
     */
    int stopScreenCapture() {
        return m_parameter ? m_parameter->setBool("che.video.stop_screen_capture", true) : -ERR_NOT_INITIALIZED;
    }

    /**
    * update screen capture region
    *
    *  @param rect     valid when windowId is 0; whole screen if rect is NULL.
    *
    *  @return return 0 if success or an error code
    */
    int updateScreenCaptureRegion(const Rect *rect) {
      if (!rect)
        return setObject("che.video.update_screen_capture_region", "{}");
      else
        return setObject("che.video.update_screen_capture_region", "{\"top\":%d,\"left\":%d,\"bottom\":%d,\"right\":%d}", rect->top, rect->left, rect->bottom, rect->right);
    }
#endif

    /**
    * set path to save the log file
    * @param [in] filePath
    *        the .log file path you want to saved
    * @return return 0 if success or an error code
    */
    int setLogFile(const char* filePath) {
        if (!m_parameter) return -ERR_NOT_INITIALIZED;
#if defined(_WIN32)
		util::AString path;
		if (!m_parameter->convertPath(filePath, path))
			filePath = path->c_str();
		else if (!filePath)
			filePath = "";
#endif
		return m_parameter->setString("rtc.log_file", filePath);
    }

    /**
    * set the log information filter level
    * @param [in] filter
    *        the filter level
    * @return return 0 if success or an error code
    */
    int setLogFilter(unsigned int filter) {
        return m_parameter ? m_parameter->setUInt("rtc.log_filter", filter&LOG_FILTER_MASK) : -ERR_NOT_INITIALIZED;
    }

    /**
    * set local video render mode
    * @param [in] renderMode
    *        the render mode
    * @return return 0 if success or an error code
    */
    int setLocalRenderMode(RENDER_MODE_TYPE renderMode) {
        return setRemoteRenderMode(0, renderMode);
    }

    /**
    * set remote video render mode
    * @param [in] renderMode
    *        the render mode
    * @return return 0 if success or an error code
    */
    int setRemoteRenderMode(uid_t uid, RENDER_MODE_TYPE renderMode) {
        return setObject("che.video.render_mode", "{\"uid\":%u,\"mode\":%d}", uid, renderMode);
    }
    
    int setLocalVideoMirrorMode(VIDEO_MIRROR_MODE_TYPE mirrorMode) {
        if (!m_parameter) return -ERR_NOT_INITIALIZED;
        const char *value;
        switch (mirrorMode) {
        case VIDEO_MIRROR_MODE_AUTO:
            value = "default";
            break;
        case VIDEO_MIRROR_MODE_ENABLED:
            value = "forceMirror";
            break;
        case VIDEO_MIRROR_MODE_DISABLED:
            value = "disableMirror";
            break;
        default:
            return -ERR_INVALID_ARGUMENT;
        }
        return m_parameter->setString("che.video.localViewMirrorSetting", value);
    }
	int startRecordingService(const char* recordingKey) {
        return m_parameter ? m_parameter->setString("rtc.api.start_recording_service", recordingKey) : -ERR_NOT_INITIALIZED;
    }
    
    int stopRecordingService(const char* recordingKey) {
        return m_parameter ? m_parameter->setString("rtc.api.stop_recording_service", recordingKey) : -ERR_NOT_INITIALIZED;
    }
    
    int refreshRecordingServiceStatus() {
        return m_parameter ? m_parameter->setBool("rtc.api.query_recording_service_status", true) : -ERR_NOT_INITIALIZED;
    }

    int enableDualStreamMode(bool enabled) {
        return setParameters("{\"rtc.dual_stream_mode\":%s,\"che.video.enableLowBitRateStream\":%d}", enabled ? "true" : "false", enabled ? 1 : 0);
    }

    int setRecordingAudioFrameParameters(int sampleRate, int channel, RAW_AUDIO_FRAME_OP_MODE_TYPE mode, int samplesPerCall) {
        return setObject("che.audio.set_capture_raw_audio_format", "{\"sampleRate\":%d,\"channelCnt\":%d,\"mode\":%d,\"samplesPerCall\":%d}", sampleRate, channel, mode, samplesPerCall);
    }
    int setPlaybackAudioFrameParameters(int sampleRate, int channel, RAW_AUDIO_FRAME_OP_MODE_TYPE mode, int samplesPerCall) {
        return setObject("che.audio.set_render_raw_audio_format", "{\"sampleRate\":%d,\"channelCnt\":%d,\"mode\":%d,\"samplesPerCall\":%d}", sampleRate, channel, mode, samplesPerCall);
    }
    int setMixedAudioFrameParameters(int sampleRate, int samplesPerCall) {
        return setObject("che.audio.set_mixed_raw_audio_format", "{\"sampleRate\":%d,\"samplesPerCall\":%d}", sampleRate, samplesPerCall);
    }
  
    int adjustRecordingSignalVolume(int volume) {//[0, 400]: e.g. 50~0.5x 100~1x 400~4x
        if (volume < 0)
            volume = 0;
        else if (volume > 400)
            volume = 400;
        return m_parameter ? m_parameter->setInt("che.audio.record.signal.volume", volume) : -ERR_NOT_INITIALIZED;
    }
    int adjustPlaybackSignalVolume(int volume) {//[0, 400]
        if (volume < 0)
            volume = 0;
        else if (volume > 400)
            volume = 400;
        return m_parameter ? m_parameter->setInt("che.audio.playout.signal.volume", volume) : -ERR_NOT_INITIALIZED;
    }
    int setHighQualityAudioParameters(bool fullband, bool stereo, bool fullBitrate) {
        return setObject("che.audio.codec.hq", "{\"fullband\":%s,\"stereo\":%s,\"fullBitrate\":%s}", fullband ? "true" : "false", stereo ? "true" : "false", fullBitrate ? "true" : "false");
    }
    int enableWebSdkInteroperability(bool enabled) {//enable interoperability with zero-plugin web sdk
        return setParameters("{\"rtc.video.web_h264_interop_enable\":%s,\"che.video.web_h264_interop_enable\":%s}", enabled ? "true" : "false", enabled ? "true" : "false");
    }
    //only for live broadcasting
    int setVideoQualityParameters(bool preferFrameRateOverImageQuality) {
        return setParameters("{\"rtc.video.prefer_frame_rate\":%s,\"che.video.prefer_frame_rate\":%s}", preferFrameRateOverImageQuality ? "true" : "false", preferFrameRateOverImageQuality ? "true" : "false");
    }
protected:
    AParameter& parameter() {
        return m_parameter;
    }
    int setParameters(const char* format, ...) {
        char buf[512];
        va_list args;
        va_start(args, format);
        vsnprintf(buf, sizeof(buf)-1, format, args);
        va_end(args);
        return m_parameter ? m_parameter->setParameters(buf) : -ERR_NOT_INITIALIZED;
    }
    int setObject(const char* key, const char* format, ...) {
        char buf[512];
        va_list args;
        va_start(args, format);
        vsnprintf(buf, sizeof(buf)-1, format, args);
        va_end(args);
        return m_parameter ? m_parameter->setObject(key, buf) : -ERR_NOT_INITIALIZED;
    }
    int enableLocalVideoCapture(bool enabled) {
        return m_parameter ? m_parameter->setBool("che.video.local.capture", enabled) : -ERR_NOT_INITIALIZED;
    }
    int enableLocalVideoRender(bool enabled) {
        return m_parameter ? m_parameter->setBool("che.video.local.render", enabled) : -ERR_NOT_INITIALIZED;
    }
    int enableLocalVideoSend(bool enabled) {
        return muteLocalVideoStream(!enabled);
    }
    int stopAllRemoteVideo() {
        return m_parameter ? m_parameter->setBool("che.video.peer.stop_render", true) : -ERR_NOT_INITIALIZED;
    }
private:
    AParameter m_parameter;
};

} //namespace rtc
} // namespace agora

/**
* to get the version number of the SDK
* @param [in, out] build
*        the build number of Agora SDK
* @return returns the string of the version of the SDK
*/
AGORA_API const char* AGORA_CALL getAgoraRtcEngineVersion(int* build);

/**
* create the RTC engine object and return the pointer
* @return returns the pointer of the RTC engine object
*/
AGORA_API agora::rtc::IRtcEngine* AGORA_CALL createAgoraRtcEngine();

/**
* create the RTC engine object and return the pointer
* @param [in] err
*        the error code
* @return returns the description of the error code
*/
AGORA_API const char* AGORA_CALL getAgoraRtcEngineErrorDescription(int err);

AGORA_API int AGORA_CALL setAgoraRtcEngineExternalSymbolLoader(void* (*func)(const char* symname));

#endif
