ZLMediaKit/src/Rtp/RtpSelector.cpp

/*
 * MIT License
 *
 * Copyright (c) 2019 Gemfield <gemfield@civilnet.cn>
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#if defined(ENABLE_RTPPROXY)
#include "RtpSelector.h"

namespace mediakit{

INSTANCE_IMP(RtpSelector);

bool RtpSelector::inputRtp(const char *data, int data_len,const struct sockaddr *addr,uint32_t *dts_out) {
    uint32_t ssrc = 0;
    if(!getSSRC(data,data_len,ssrc)){
        WarnL << "get ssrc from rtp failed:" << data_len;
        return false;
    }
    auto process = getProcess(ssrc, true);
    if(process){
        return process->inputRtp(data,data_len, addr,dts_out);
    }
    return false;
}

bool RtpSelector::getSSRC(const char *data,int data_len, uint32_t &ssrc){
    if(data_len < 12){
        return false;
    }
    uint32_t *ssrc_ptr = (uint32_t *)(data + 8);
    ssrc = ntohl(*ssrc_ptr);
    return true;
}

RtpProcess::Ptr RtpSelector::getProcess(uint32_t ssrc,bool makeNew) {
    lock_guard<decltype(_mtx_map)> lck(_mtx_map);
    auto it = _map_rtp_process.find(ssrc);
    if(it == _map_rtp_process.end() && !makeNew){
        return nullptr;
    }
    RtpProcessHelper::Ptr &ref = _map_rtp_process[ssrc];
    if(!ref){
        ref = std::make_shared<RtpProcessHelper>(ssrc,shared_from_this());
        ref->attachEvent();
        createTimer();
    }
    return ref->getProcess();
}

void RtpSelector::createTimer() {
    if (!_timer) {
        //创建超时管理定时器
        weak_ptr<RtpSelector> weakSelf = shared_from_this();
        _timer = std::make_shared<Timer>(3.0, [weakSelf] {
            auto strongSelf = weakSelf.lock();
            if (!strongSelf) {
                return false;
            }
            strongSelf->onManager();
            return true;
        }, EventPollerPool::Instance().getPoller());
    }
}

void RtpSelector::delProcess(uint32_t ssrc,const RtpProcess *ptr) {
    lock_guard<decltype(_mtx_map)> lck(_mtx_map);
    auto it = _map_rtp_process.find(ssrc);
    if(it == _map_rtp_process.end()){
        return;
    }

    if(it->second->getProcess().get() != ptr){
        return;
    }

    _map_rtp_process.erase(it);
}

void RtpSelector::onManager() {
    lock_guard<decltype(_mtx_map)> lck(_mtx_map);
    for (auto it = _map_rtp_process.begin(); it != _map_rtp_process.end();) {
        if (it->second->getProcess()->alive()) {
            ++it;
            continue;
        }
        WarnL << "RtpProcess timeout:" << printSSRC(it->first);
        it = _map_rtp_process.erase(it);
    }
}

RtpSelector::RtpSelector() {
}

RtpSelector::~RtpSelector() {
}

RtpProcessHelper::RtpProcessHelper(uint32_t ssrc, const weak_ptr<RtpSelector> &parent) {
    _ssrc = ssrc;
    _parent = parent;
    _process = std::make_shared<RtpProcess>(_ssrc);
}

RtpProcessHelper::~RtpProcessHelper() {
}

void RtpProcessHelper::attachEvent() {
    _process->setListener(shared_from_this());
}

bool RtpProcessHelper::close(MediaSource &sender, bool force) {
    //此回调在其他线程触发
    if(!_process || (!force && _process->totalReaderCount())){
        return false;
    }
    auto parent = _parent.lock();
    if(!parent){
        return false;
    }
    parent->delProcess(_ssrc,_process.get());
    string err = StrPrinter << "close media:" << sender.getSchema() << "/" << sender.getVhost() << "/" << sender.getApp() << "/" << sender.getId() << " " << force;
    return true;
}

void RtpProcessHelper::onNoneReader(MediaSource &sender) {
    if(!_process || _process->totalReaderCount()){
        return;
    }
    MediaSourceEvent::onNoneReader(sender);
}

int RtpProcessHelper::totalReaderCount(MediaSource &sender) {
    return _process ? _process->totalReaderCount() : sender.totalReaderCount();
}

RtpProcess::Ptr &RtpProcessHelper::getProcess() {
    return _process;
}

}//namespace mediakit
#endif//defined(ENABLE_RTPPROXY)