ZLMediaKit/src/Rtp/RtpSession.cpp

/*
 * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
 *
 * This file is part of ZLMediaKit(https://github.com/xia-chu/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.
 */

#if defined(ENABLE_RTPPROXY)
#include "RtpSession.h"
#include "RtpSelector.h"
#include "Network/TcpServer.h"
namespace mediakit{

const string RtpSession::kStreamID = "stream_id";

void RtpSession::attachServer(const TcpServer &server) {
    _stream_id = const_cast<TcpServer &>(server)[kStreamID];
}

RtpSession::RtpSession(const Socket::Ptr &sock) : TcpSession(sock) {
    DebugP(this);
    socklen_t addr_len = sizeof(addr);
    getpeername(sock->rawFD(), &addr, &addr_len);
}
RtpSession::~RtpSession() {
    DebugP(this);
    if(_process){
        RtpSelector::Instance().delProcess(_stream_id,_process.get());
    }
}

void RtpSession::onRecv(const Buffer::Ptr &data) {
    try {
        RtpSplitter::input(data->data(), data->size());
    } catch (SockException &ex) {
        shutdown(ex);
    } catch (std::exception &ex) {
        shutdown(SockException(Err_other, ex.what()));
    }
}

void RtpSession::onError(const SockException &err) {
    WarnL << _stream_id << " " << err.what();
}

void RtpSession::onManager() {
    if(_process && !_process->alive()){
        shutdown(SockException(Err_timeout, "receive rtp timeout"));
    }

    if(!_process && _ticker.createdTime() > 10 * 1000){
        shutdown(SockException(Err_timeout, "illegal connection"));
    }
}

void RtpSession::onRtpPacket(const char *data, size_t len) {
    if (len > 1024 * 10) {
        throw SockException(Err_shutdown, StrPrinter << "rtp包长度异常(" << len << ")，发送端可能缓存溢出并覆盖");
    }
    if (!_process) {
        uint32_t ssrc;
        if (!RtpSelector::getSSRC(data, len, ssrc)) {
            return;
        }
        if (_stream_id.empty()) {
            //未指定流id就使用ssrc为流id
            _stream_id = printSSRC(ssrc);
        }
        //tcp情况下，一个tcp链接只可能是一路流，不需要通过多个ssrc来区分，所以不需要频繁getProcess
        _process = RtpSelector::Instance().getProcess(_stream_id, true);
        _process->setListener(dynamic_pointer_cast<RtpSession>(shared_from_this()));
    }
    _process->inputRtp(false, getSock(), data, len, &addr);
    _ticker.resetTime();
}

bool RtpSession::close(MediaSource &sender, bool force) {
    //此回调在其他线程触发
    if(!_process || (!force && _process->totalReaderCount())){
        return false;
    }
    string err = StrPrinter << "close media:" << sender.getSchema() << "/" << sender.getVhost() << "/" << sender.getApp() << "/" << sender.getId() << " " << force;
    safeShutdown(SockException(Err_shutdown,err));
    return true;
}

int RtpSession::totalReaderCount(MediaSource &sender) {
    //此回调在其他线程触发
    return _process ? _process->totalReaderCount() : sender.totalReaderCount();
}

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