ZLMediaKit/src/Rtsp/RtspDemuxer.cpp

/*
 * MIT License
 *
 * Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
 *
 * 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.
 */

#include <cctype>
#include <algorithm>
#include "RtspDemuxer.h"
#include "Util/base64.h"
#include "Extension/Factory.h"

using namespace std;

namespace mediakit {

void RtspDemuxer::loadSdp(const string &sdp){
    loadSdp(SdpParser(sdp));
}

void RtspDemuxer::loadSdp(const SdpParser &attr) {
    auto tracks = attr.getAvailableTrack();
    for (auto &track : tracks){
        switch (track->_type) {
            case TrackVideo: {
                makeVideoTrack(track);
            }
                break;
            case TrackAudio: {
                makeAudioTrack(track);
            }
                break;
            default:
                break;
        }
    }
    auto titleTrack = attr.getTrack(TrackTitle);
    if(titleTrack){
        _fDuration = titleTrack->_duration;
    }
}
bool RtspDemuxer::inputRtp(const RtpPacket::Ptr & rtp) {
    switch (rtp->type) {
    case TrackVideo:{
        if(_videoRtpDecoder){
            return _videoRtpDecoder->inputRtp(rtp, true);
        }
        return false;
    }
    case TrackAudio:{
        if(_audioRtpDecoder){
            _audioRtpDecoder->inputRtp(rtp, false);
            return false;
        }
        return false;
    }
    default:
        return false;
    }
}


void RtspDemuxer::makeAudioTrack(const SdpTrack::Ptr &audio) {
    //生成Track对象
    _audioTrack = dynamic_pointer_cast<AudioTrack>(Factory::getTrackBySdp(audio));
    if(_audioTrack){
        //生成RtpCodec对象以便解码rtp
        _audioRtpDecoder = Factory::getRtpDecoderByTrack(_audioTrack);
        if(_audioRtpDecoder){
            //设置rtp解码器代理，生成的frame写入该Track
            _audioRtpDecoder->addDelegate(_audioTrack);
            onAddTrack(_audioTrack);
        } else{
            //找不到相应的rtp解码器，该track无效
            _audioTrack.reset();
        }
    }
}

void RtspDemuxer::makeVideoTrack(const SdpTrack::Ptr &video) {
    //生成Track对象
    _videoTrack = dynamic_pointer_cast<VideoTrack>(Factory::getTrackBySdp(video));
    if(_videoTrack){
        //生成RtpCodec对象以便解码rtp
        _videoRtpDecoder = Factory::getRtpDecoderByTrack(_videoTrack);
        if(_videoRtpDecoder){
            //设置rtp解码器代理，生成的frame写入该Track
            _videoRtpDecoder->addDelegate(_videoTrack);
            onAddTrack(_videoTrack);
        }else{
            //找不到相应的rtp解码器，该track无效
            _videoTrack.reset();
        }
    }
}

} /* namespace mediakit */