ZLMediaKit/src/Rtmp/RtmpPlayer.cpp

/*
 * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Use of this source code is governed by MIT 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 "RtmpPlayer.h"
#include "Rtmp/utils.h"
#include "Util/util.h"
#include "Util/onceToken.h"
#include "Thread/ThreadPool.h"
using namespace toolkit;
using namespace mediakit::Client;

namespace mediakit {

RtmpPlayer::RtmpPlayer(const EventPoller::Ptr &poller) : TcpClient(poller) {
}

RtmpPlayer::~RtmpPlayer() {
    DebugL << endl;
}

void RtmpPlayer::teardown() {
    if (alive()) {
        shutdown(SockException(Err_shutdown,"teardown"));
    }
    _strApp.clear();
    _strStream.clear();
    _strTcUrl.clear();
    _pBeatTimer.reset();
    _pPlayTimer.reset();
    _pMediaTimer.reset();
    _iSeekTo = 0;
    RtmpProtocol::reset();

    CLEAR_ARR(_aiFistStamp);
    CLEAR_ARR(_aiNowStamp);

    lock_guard<recursive_mutex> lck(_mtxOnResultCB);
    _mapOnResultCB.clear();
    lock_guard<recursive_mutex> lck2(_mtxOnStatusCB);
    _dqOnStatusCB.clear();
}

void RtmpPlayer::play(const string &strUrl)  {
    teardown();
    string strHost = FindField(strUrl.data(), "://", "/");
    _strApp = 	FindField(strUrl.data(), (strHost + "/").data(), "/");
    _strStream = FindField(strUrl.data(), (strHost + "/" + _strApp + "/").data(), NULL);
    _strTcUrl = string("rtmp://") + strHost + "/" + _strApp;

    if (!_strApp.size() || !_strStream.size()) {
        onPlayResult_l(SockException(Err_other,"rtmp url非法"),false);
        return;
    }
    DebugL << strHost << " " << _strApp << " " << _strStream;

    auto iPort = atoi(FindField(strHost.data(), ":", NULL).data());
    if (iPort <= 0) {
        //rtmp 默认端口1935
        iPort = 1935;
    } else {
        //服务器域名
        strHost = FindField(strHost.data(), NULL, ":");
    }
    if(!(*this)[kNetAdapter].empty()){
        setNetAdapter((*this)[kNetAdapter]);
    }

    weak_ptr<RtmpPlayer> weakSelf= dynamic_pointer_cast<RtmpPlayer>(shared_from_this());
    float playTimeOutSec = (*this)[kTimeoutMS].as<int>() / 1000.0;
    _pPlayTimer.reset( new Timer(playTimeOutSec, [weakSelf]() {
        auto strongSelf=weakSelf.lock();
        if(!strongSelf) {
            return false;
        }
        strongSelf->onPlayResult_l(SockException(Err_timeout,"play rtmp timeout"),false);
        return false;
    },getPoller()));

    _metadata_got = false;
    startConnect(strHost, iPort , playTimeOutSec);
}
void RtmpPlayer::onErr(const SockException &ex){
    //定时器_pPlayTimer为空后表明握手结束了
    onPlayResult_l(ex, !_pPlayTimer);
}

void RtmpPlayer::onPlayResult_l(const SockException &ex , bool handshakeCompleted) {
    WarnL << ex.getErrCode() << " " << ex.what();

    if(!ex){
        //播放成功，恢复rtmp接收超时定时器
        _mediaTicker.resetTime();
        weak_ptr<RtmpPlayer> weakSelf = dynamic_pointer_cast<RtmpPlayer>(shared_from_this());
        int timeoutMS = (*this)[kMediaTimeoutMS].as<int>();
        //创建rtmp数据接收超时检测定时器
        _pMediaTimer.reset( new Timer(timeoutMS / 2000.0, [weakSelf,timeoutMS]() {
            auto strongSelf=weakSelf.lock();
            if(!strongSelf) {
                return false;
            }
            if(strongSelf->_mediaTicker.elapsedTime()> timeoutMS) {
                //接收rtmp媒体数据超时
                strongSelf->onPlayResult_l(SockException(Err_timeout,"receive rtmp timeout"),true);
                return false;
            }
            return true;
        },getPoller()));
    }

    if (!handshakeCompleted) {
        //开始播放阶段
        _pPlayTimer.reset();
        onPlayResult(ex);
        //是否为性能测试模式
        _benchmark_mode = (*this)[Client::kBenchmarkMode].as<int>();
    } else if (ex) {
        //播放成功后异常断开回调
        onShutdown(ex);
    } else {
        //恢复播放
        onResume();
    }

    if(ex){
        teardown();
    }
}
void RtmpPlayer::onConnect(const SockException &err){
    if(err.getErrCode() != Err_success) {
        onPlayResult_l(err, false);
        return;
    }
    weak_ptr<RtmpPlayer> weakSelf= dynamic_pointer_cast<RtmpPlayer>(shared_from_this());
    startClientSession([weakSelf](){
        auto strongSelf=weakSelf.lock();
        if(!strongSelf) {
            return;
        }
        strongSelf->send_connect();
    });
}
void RtmpPlayer::onRecv(const Buffer::Ptr &pBuf){
    try {
        if(_benchmark_mode && !_pPlayTimer){
            //在性能测试模式下，如果rtmp握手完毕后，不再解析rtmp包
            _mediaTicker.resetTime();
            return;
        }
        onParseRtmp(pBuf->data(), pBuf->size());
    } catch (exception &e) {
        SockException ex(Err_other, e.what());
        //定时器_pPlayTimer为空后表明握手结束了
        onPlayResult_l(ex, !_pPlayTimer);
    }
}

void RtmpPlayer::pause(bool bPause) {
    send_pause(bPause);
}

inline void RtmpPlayer::send_connect() {
    AMFValue obj(AMF_OBJECT);
    obj.set("app", _strApp);
    obj.set("tcUrl", _strTcUrl);
    //未使用代理
    obj.set("fpad", false);
    //参考librtmp,什么作用?
    obj.set("capabilities", 15);
    //SUPPORT_VID_CLIENT_SEEK 支持seek
    obj.set("videoFunction", 1);
    //只支持aac
    obj.set("audioCodecs", (double)(0x0400));
    //只支持H264
    obj.set("videoCodecs", (double)(0x0080));
    sendInvoke("connect", obj);
    addOnResultCB([this](AMFDecoder &dec){
        //TraceL << "connect result";
        dec.load<AMFValue>();
        auto val = dec.load<AMFValue>();
        auto level = val["level"].as_string();
        auto code = val["code"].as_string();
        if(level != "status"){
            throw std::runtime_error(StrPrinter <<"connect 失败:" << level << " " << code << endl);
        }
        send_createStream();
    });
}

inline void RtmpPlayer::send_createStream() {
    AMFValue obj(AMF_NULL);
    sendInvoke("createStream", obj);
    addOnResultCB([this](AMFDecoder &dec){
        //TraceL << "createStream result";
        dec.load<AMFValue>();
        _ui32StreamId = dec.load<int>();
        send_play();
    });
}

inline void RtmpPlayer::send_play() {
    AMFEncoder enc;
    enc << "play" << ++_iReqID  << nullptr << _strStream << (double)_ui32StreamId;
    sendRequest(MSG_CMD, enc.data());
    auto fun = [this](AMFValue &val){
        //TraceL << "play onStatus";
        auto level = val["level"].as_string();
        auto code = val["code"].as_string();
        if(level != "status"){
            throw std::runtime_error(StrPrinter <<"play 失败:" << level << " " << code << endl);
        }
    };
    addOnStatusCB(fun);
    addOnStatusCB(fun);
}

inline void RtmpPlayer::send_pause(bool bPause) {
    AMFEncoder enc;
    enc << "pause" << ++_iReqID  << nullptr << bPause;
    sendRequest(MSG_CMD, enc.data());
    auto fun = [this,bPause](AMFValue &val){
        //TraceL << "pause onStatus";
        auto level = val["level"].as_string();
        auto code = val["code"].as_string();
        if(level != "status") {
            if(!bPause){
                throw std::runtime_error(StrPrinter <<"pause 恢复播放失败:" << level << " " << code << endl);
            }
        }else{
            _bPaused = bPause;
            if(!bPause){
                onPlayResult_l(SockException(Err_success, "resum rtmp success"), true);
            }else{
                //暂停播放
                _pMediaTimer.reset();
            }
        }
    };
    addOnStatusCB(fun);

    _pBeatTimer.reset();
    if(bPause){
        weak_ptr<RtmpPlayer> weakSelf = dynamic_pointer_cast<RtmpPlayer>(shared_from_this());
        _pBeatTimer.reset(new Timer((*this)[kBeatIntervalMS].as<int>() / 1000.0,[weakSelf](){
            auto strongSelf = weakSelf.lock();
            if (!strongSelf){
                return false;
            }
            uint32_t timeStamp = ::time(NULL);
            strongSelf->sendUserControl(CONTROL_PING_REQUEST, timeStamp);
            return true;
        },getPoller()));
    }
}

void RtmpPlayer::onCmd_result(AMFDecoder &dec){
    auto iReqId = dec.load<int>();
    lock_guard<recursive_mutex> lck(_mtxOnResultCB);
    auto it = _mapOnResultCB.find(iReqId);
    if(it != _mapOnResultCB.end()){
        it->second(dec);
        _mapOnResultCB.erase(it);
    }else{
        WarnL << "unhandled _result";
    }
}
void RtmpPlayer::onCmd_onStatus(AMFDecoder &dec) {
    AMFValue val;
    while(true){
        val = dec.load<AMFValue>();
        if(val.type() == AMF_OBJECT){
            break;
        }
    }
    if(val.type() != AMF_OBJECT){
        throw std::runtime_error("onStatus:the result object was not found");
    }
    
    lock_guard<recursive_mutex> lck(_mtxOnStatusCB);
    if(_dqOnStatusCB.size()){
        _dqOnStatusCB.front()(val);
        _dqOnStatusCB.pop_front();
    }else{
        auto level = val["level"];
        auto code = val["code"].as_string();
        if(level.type() == AMF_STRING){
            if(level.as_string() != "status"){
                throw std::runtime_error(StrPrinter <<"onStatus 失败:" << level.as_string() << " " << code << endl);
            }
        }
        //WarnL << "unhandled onStatus:" << code;
    }
}

void RtmpPlayer::onCmd_onMetaData(AMFDecoder &dec) {
    //TraceL;
    auto val = dec.load<AMFValue>();
    if(!onCheckMeta(val)){
        throw std::runtime_error("onCheckMeta failed");
    }
    _metadata_got = true;
}

void RtmpPlayer::onStreamDry(uint32_t ui32StreamId) {
    //TraceL << ui32StreamId;
    onPlayResult_l(SockException(Err_other,"rtmp stream dry"), true);
}

void RtmpPlayer::onMediaData_l(const RtmpPacket::Ptr &packet) {
    _mediaTicker.resetTime();
    if(!_pPlayTimer){
        //已经触发了onPlayResult事件，直接触发onMediaData事件
        onMediaData(packet);
        return;
    }

    if(packet->isCfgFrame()){
        //输入配置帧以便初始化完成各个track
        onMediaData(packet);
    }else{
        //先触发onPlayResult事件，这个时候解码器才能初始化完毕
        onPlayResult_l(SockException(Err_success,"play rtmp success"), false);
        //触发onPlayResult事件后，再把帧数据输入到解码器
        onMediaData(packet);
    }
}


void RtmpPlayer::onRtmpChunk(RtmpPacket &chunkData) {
    typedef void (RtmpPlayer::*rtmp_func_ptr)(AMFDecoder &dec);
    static unordered_map<string, rtmp_func_ptr> s_func_map;
    static onceToken token([]() {
        s_func_map.emplace("_error",&RtmpPlayer::onCmd_result);
        s_func_map.emplace("_result",&RtmpPlayer::onCmd_result);
        s_func_map.emplace("onStatus",&RtmpPlayer::onCmd_onStatus);
        s_func_map.emplace("onMetaData",&RtmpPlayer::onCmd_onMetaData);
    }, []() {});

    switch (chunkData.typeId) {
        case MSG_CMD:
        case MSG_CMD3:
        case MSG_DATA:
        case MSG_DATA3: {
            AMFDecoder dec(chunkData.strBuf, 0);
            std::string type = dec.load<std::string>();
            auto it = s_func_map.find(type);
            if(it != s_func_map.end()){
                auto fun = it->second;
                (this->*fun)(dec);
            }else{
                WarnL << "can not support cmd:" << type;
            }
        }
            break;
        case MSG_AUDIO:
        case MSG_VIDEO: {
            auto idx = chunkData.typeId%2;
            if (_aNowStampTicker[idx].elapsedTime() > 500) {
                //计算播放进度时间轴用
                _aiNowStamp[idx] = chunkData.timeStamp;
            }
            if(!_metadata_got){
                if(!onCheckMeta(TitleMeta().getMetadata())){
                    throw std::runtime_error("onCheckMeta failed");
                }
                _metadata_got = true;
            }
            onMediaData_l(std::make_shared<RtmpPacket>(std::move(chunkData)));
        }
            break;
        default:
            //WarnL << "unhandled message:" << (int) chunkData.typeId << hexdump(chunkData.strBuf.data(), chunkData.strBuf.size());
            break;
        }
}

uint32_t RtmpPlayer::getProgressMilliSecond() const{
    uint32_t iTime[2] = {0,0};
    for(auto i = 0 ;i < 2 ;i++){
        iTime[i] = _aiNowStamp[i] - _aiFistStamp[i];
    }
    return _iSeekTo + MAX(iTime[0],iTime[1]);
}
void RtmpPlayer::seekToMilliSecond(uint32_t seekMS){
    if (_bPaused) {
        pause(false);
    }
    AMFEncoder enc;
    enc << "seek" << ++_iReqID << nullptr << seekMS * 1.0;
    sendRequest(MSG_CMD, enc.data());
    addOnStatusCB([this,seekMS](AMFValue &val) {
        //TraceL << "seek result";
        _aNowStampTicker[0].resetTime();
        _aNowStampTicker[1].resetTime();
        int iTimeInc = seekMS - getProgressMilliSecond();
        for(auto i = 0 ;i < 2 ;i++){
            _aiFistStamp[i] = _aiNowStamp[i] + iTimeInc;
            _aiNowStamp[i] = _aiFistStamp[i];
        }
        _iSeekTo = seekMS;
    });

}

} /* namespace mediakit */