摘要：搞定了实时预览后，另一个功能就是录像回放，录像回放和视频点播功能完全一致，唯一的区别就是发送点播的sdp信息中携带了开始时间和结束时间，因为是录像文件，所以有这个时间，而实时视频预览这个对应的值是0，录像文件是可以切换播放进度的，实时视频是无法切换进度的，因为
搞定了实时预览后，另一个功能就是录像回放，录像回放和视频点播功能完全一致，唯一的区别就是发送点播的sdp信息中携带了开始时间和结束时间，因为是录像文件，所以有这个时间，而实时视频预览这个对应的值是0，录像文件是可以切换播放进度的，实时视频是无法切换进度的，因为当前是7点钟，不可能切换到未来的某个时间点查看到对应的视频画面，遇到过几个用户居然希望问为何实时预览功能不支持切换进度，这个从逻辑层面来说就是无法实现的。
要实现录像回放，首先就是要拿到录像文件，也就是录像文件查询，发个查询指令到设备端，会返回录像文件的信息，这里有个细节强调下，返回的录像文件信息并不是在一个xml中，可能一个xml中有多个录像文件信息，也可能只有一个，不同厂家约定不同，都是合规的，所以在tcp模式交互的sip数据中，很可能出现粘包的情况，需要自己取出来逐个解析，这个细节很多国标工具没有实现。
在回放的过程中，还可以任意切换播放进度，不少厂家用的很老的机制实现的切换进度，也就是重新点播，这样好处是兼容了各个国标版本，坏处是相当于重新点播，切换过程会黑屏中断2s左右。其实国标协议就提供了切换播放进度的sip协议，只需要发给设备端即可，设备收到切换进度指令后，会立即用指定进度的开始的位置发流过来，这边收到后立即解析即可。
//查询文件：服务端-》设备端MESSAGE sip:34020000001320000002@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bKe9591d42a3cc4518a421b62aa668428dFrom: ;tag=1038To: Call-ID: a6d47d255da543e79f484475b49340deCSeq: 41 MESSAGEUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 262Content-Type: application/MANSCDP+xmlContact: RecordInfo10035340200000013100000012025-04-18T00:00:002025-04-19T23:59:59all//文件返回：设备端-》服务端MESSAGE sip:34020000002000000001@3402000000 SIP/2.0Via: SIP/2.0/UDP 192.168.0.64:5060;rport;branch=z9hG4bK727604973From: ;tag=593479594To: Call-ID: 40677081CSeq: 20 MESSAGEContent-Type: Application/MANSCDP+xmlMax-Forwards: 70User-Agent: IP CameraContent-Length: 3161RecordInfo1003534020000001310000001hikangname13434020000001310000001hikangnamefile_pathAddress 12025-04-18T10:23:022025-04-18T10:40:200time26309427234020000001310000001hikangnamefile_pathAddress 12025-04-18T10:40:202025-04-18T10:57:360time262488064//点播请求：服务端-》设备端INVITE sip:34020000001310000001@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/udp 192.168.0.110:15060;branch=z3hG9bK3d8b174429304a9d8af106f460debf9bFrom: ;tag=1039To: Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 42 INVITEUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 342Content-Type: application/sdpContact: Subject: 34020000001310000001:1000010003,34020000002000000001:0v=0o=34020000001310000001 0 0 IN IP4 192.168.0.110s=Downloadu=34020000001310000001:0c=IN IP4 192.168.0.110t=1744946094 1744947129m=video 6902 RTP/AVP 96 97 98a=recvonlya=setup:passivea=connection:newa=rtpmap:96 PS/90000a=rtpmap:97 MPEG4/90000a=rtpmap:98 H264/90000a=downloadspeed:8a=streamprofile:1y=1000010003//请求应答：设备端-》服务端SIP/2.0 200 OKVia: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK3d8b174429304a9d8af106f460debf9bFrom: ;tag=1039To: ;tag=723451991Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 42 INVITEContact: Content-Type: application/sdpUser-Agent: IP CameraContent-Length: 211v=0o=34020000001320000002 539 539 IN IP4 192.168.0.64s=Downloadc=IN IP4 192.168.0.64t=0 0m=video 15060 RTP/AVP 96a=setup:activea=sendonlya=rtpmap:96 PS/90000a=filesize:262209536y=1000010003//开始点播：服务端-》设备端ACK sip:34020000001320000002@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK3d8b174429304a9d8af106f460debf9bFrom: ;tag=1039To: ;tag=723451991Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 42 ACK//暂停播放：服务端-》设备端INFO sip:34020000001310000001@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK28e2fc9dac8b421f9a8450a10933210dFrom: ;tag=1039To: ;tag=723451991Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 43 INFOUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 41Content-Type: application/MANSrtspContact: PAUSE RTSP/1.0CSeq: 1PauseTime: now//继续播放：服务端-》设备端INFO sip:34020000001310000001@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK86d002cd67004d0487ed0000b652c1bdFrom: ;tag=1039To: ;tag=723451991Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 45 INFOUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 41Content-Type: application/MANSRTSPContact: PLAY RTSP/1.0CSeq: 3Range: npt=now-//切换速度：服务端-》设备端INFO sip:34020000001310000001@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bKd790bfabeea74caaba1594708fb91adaFrom: ;tag=1039To: ;tag=723451991Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 46 INFOUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 34Content-Type: application/MANSRTSPContact: PLAY RTSP/1.0CSeq: 4Scale: 4//切换进度：服务端-》设备端INFO sip:34020000001310000001@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bKeb9b6621c9e446c9912f48127ecf0932From: ;tag=1039To: ;tag=723451991Call-ID: 2b3bf36cf7164ea0aac06fbd3e24680fCSeq: 47 INFOUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 41Content-Type: application/MANSRTSPContact: PLAY RTSP/1.0CSeq: 5Range: npt=379-//下载请求：服务端-》设备端INVITE sip:34020000001310000001@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK6a208da569eb44028e0d159f9f245386From: ;tag=1041To: Call-ID: 3bd33cd0f76c40e8b0d702b4212c74e5CSeq: 50 INVITEUser-Agent: wx_feiyangqingyunMax-Forwards: 70Content-Length: 342Content-Type: application/sdpContact: Subject: 34020000001310000001:1000010004,34020000002000000001:0v=0o=34020000001310000001 0 0 IN IP4 192.168.0.110s=Downloadu=34020000001310000001:0c=IN IP4 192.168.0.110t=1744856617 1744856620m=video 6902 RTP/AVP 96 97 98a=recvonlya=setup:passivea=connection:newa=rtpmap:96 PS/90000a=rtpmap:97 MPEG4/90000a=rtpmap:98 H264/90000a=downloadspeed:8a=streamprofile:1y=1000010004//请求应答：设备端-》服务端SIP/2.0 200 OKVia: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK6a208da569eb44028e0d159f9f245386From: ;tag=1041To: ;tag=1160726752Call-ID: 3bd33cd0f76c40e8b0d702b4212c74e5CSeq: 50 INVITEContact: Content-Type: application/sdpUser-Agent: IP CameraContent-Length: 211v=0o=34020000001320000002 2589 2589 IN IP4 192.168.0.64s=Downloadc=IN IP4 192.168.0.64t=0 0m=video 15060 RTP/AVP 96a=setup:activea=sendonlya=rtpmap:96 PS/90000a=filesize:1367160y=1000010004//开始下载：服务端-》设备端ACK sip:34020000001320000002@192.168.0.64:5060 SIP/2.0Via: SIP/2.0/UDP 192.168.0.110:15060;branch=z3hG9bK6a208da569eb44028e0d159f9f245386From: ;tag=1041To: ;tag=1160726752Call-ID: 3bd33cd0f76c40e8b0d702b4212c74e5CSeq: 50 ACK
支持设备注册、注销、心跳、校时、注册认证、注销认证等。设备上线后可以手动获取设备状态、设备信息、配置信息、预置位信息等。设备上线后自动获取设备通道信息，包括中文通道名称。识别到通道上线离线变化，会重新获取该设备的所有通道信息。支持视频点播，可以分别点播主码流和子码流，内置rtp解包线程，解包后发给视频播放组件解码播放。每个设备每个通道支持点播多个视频，通过ssrc区分，支持共用端口和不同端口收流。支持对某个设备下面所有通道、某个通道、某个通道对应的某个流分别关闭。支持录像文件查询和回放，回放控制支持暂停播放、继续播放、倍速播放、切换播放进度。支持录像文件下载，支持倍速比如8倍速下载，可同时多线程批量下载。回放和下载同时支持IPC和NVR，比如摄像头自带的SD存储卡录像文件回放，NVR上的硬盘录像文件回放。支持云台控制，向上、向下、向左、向右、左上、右上、左下、右下方位移动，镜头放大缩小，光圈放大缩小，镜头聚焦放焦。支持预置位信息的查询、调用、添加、修改、删除等操作。自动目录订阅功能，通道上线下线都有对应的信号通知。内置定时读取通道信息机制，以保证通道信息是最新的，比如有些NVR是不断更新的通道信息。内置订阅警情和位置移动功能，订阅后各种警情事件比如运动目标检测报警、入侵检测报警、徘徊检测报警等自动上报。支持语音对讲功能，可以直接在视频窗体的悬浮条上单击语音对讲按钮，再次单击关闭对讲，对讲期间悬浮条常驻显示。支持设备布防撤防，布防后警情信息会主动上报。国标服务同时支持udp和tcp方式，可选只监听一种或者两种都监听，tcp方式自动处理粘包问题。国标拉流同时支持udp、tcp被动、tcp主动三种方式，每个通道都可以自由选择何种拉流方式。内置拉流端口池，每次拉流从中取出一个，关闭流自动回收端口号，重复利用。收流端口自动纠错，自动跳过被占用的端口，不会出现端口占用导致收流失败的情况。支持三种取流方式自动检测离线重连，检测到离线后，自动重启点播拉流整个流程。录像文件回放，上一个完成后自动切换到下一个继续回放，直到所有回放完成。支持高达8倍速回放。视频播放自适应硬解码，极低资源占用，实时性极好，带悬浮条显示视频流信息，可以直接在悬浮条单击按钮保存录像文件到本地。支持几千路国标消息交互并发，实时视频流支持64路同时显示，可以拓展更多路数。支持阿里云等云服务器，可以分别设置内网监听地址和外网访问地址，一般云服务器上是监听地址用内网，对外访问用外网地址。支持视频分发，也就是推流，视频通道打开后可以自动推流到流媒体服务器，其他需要的地方拉流即可，支持rtsp、rtmp、hls、webrtc等方式拉流。实时预览和录像回放都支持推流，推流支持叠加文字和图片水印以及各种ffmpeg支持的滤镜效果，支持多个水印同时叠加。同时支持gb28181-2011、gb28181-2016、gb28181-2022以及后续可能的所有协议版本。SIP解析和交互采用纯Qt底层代码实现，udp/tcp通信交互，祖传原创代码解析，不依赖任何第三方。代码量少，gb28181交互部分共几千行代码，注释详细，接口友好，使用极其简单，提供非常详细的使用示例。支持海康、大华、宇视、华为、天地伟业等所有国标设备，包括一些没有ssrc的设备。支持所有Qt版本和编译器以及操作系统，包括但不限于win、linux、mac、android、嵌入式linux、树莓派香橙派、国产os等。 #include "frmvideoplayback.h"#include "ui_frmvideoplayback.h"#include "qthelper.h"#include "videoutil.h"#include "gb28181server.h"#include "gb28181helper.h"frmVideoPlayback::frmVideoPlayback(QWidget *parent) : QWidget(parent), ui(new Ui::frmVideoPlayback){ui->setupUi(this);this->initForm;this->initConfig;}frmVideoPlayback::~frmVideoPlayback{delete ui;}void frmVideoPlayback::closeAll{this->setId("", "");ui->listWidget->clear;ui->btnStop->click;}void frmVideoPlayback::setServer(GB28181Server *server){this->server = server;ui->gb28181Widget->setServer(server);}void frmVideoPlayback::setId(const QString &deviceId, const QString &channelId){this->deviceId = deviceId;this->channelId = channelId;}void frmVideoPlayback::initForm{server = NULL;ui->sliderPosition->setRange(0, 0);ui->gb28181Widget->setBgText("视频回放");ui->gb28181Widget->setProperty("onSync", AppConfig::RecordOnSync);connect(ui->btnPlay, SIGNAL(clicked(bool)), this, SLOT(playControl));connect(ui->btnStop, SIGNAL(clicked(bool)), this, SLOT(playControl));connect(ui->sliderPosition, SIGNAL(clicked), this, SLOT(playControl));connect(ui->cboxSpeed, SIGNAL(currentIndexChanged(int)), this, SLOT(playControl));connect(ui->gb28181Widget, SIGNAL(sig_receivePlayStart(int)), this, SLOT(receivePlayStart(int)));connect(ui->gb28181Widget, SIGNAL(sig_receivePlayFinsh), this, SLOT(receivePlayFinsh));//进度定时器timer = new QTimer(this);connect(timer, SIGNAL(timeout), this, SLOT(setPosition));timer->setInterval(300);}void frmVideoPlayback::initConfig{//ui->cboxSpeed->setEnabled(false);VideoUtil::loadSpeed(ui->cboxSpeed);ui->cboxSpeed->setCurrentIndex(ui->cboxSpeed->findData(AppConfig::RecordSpeed));connect(ui->cboxSpeed, SIGNAL(currentIndexChanged(int)), this, SLOT(saveConfig));ui->dateStart->setDateTime(QDateTime::fromString(AppConfig::RecordStart, "yyyy-MM-ddThh:mm:ss"));connect(ui->dateStart, SIGNAL(dateTimeChanged(QDateTime)), this, SLOT(saveConfig));ui->dateEnd->setDateTime(QDateTime::fromString(AppConfig::RecordEnd, "yyyy-MM-ddThh:mm:ss"));connect(ui->dateEnd, SIGNAL(dateTimeChanged(QDateTime)), this, SLOT(saveConfig));}void frmVideoPlayback::saveConfig{AppConfig::RecordSpeed = ui->cboxSpeed->itemData(ui->cboxSpeed->currentIndex).toString;AppConfig::RecordStart = ui->dateStart->dateTime.toString("yyyy-MM-ddThh:mm:ss");AppConfig::RecordEnd = ui->dateEnd->dateTime.toString("yyyy-MM-ddThh:mm:ss");AppConfig::writeConfig;}void frmVideoPlayback::setPosition{qint64 pts = ui->gb28181Widget->getPts;VideoUtil::setPosition(ui->labPosition, ui->sliderPosition, pts * 100);}void frmVideoPlayback::receivePlayStart(int){//取出时间QListWidgetItem *item = ui->listWidget->currentItem;QString startTime = item->data(Qt::UserRole + 1).toString;QString endTime = item->data(Qt::UserRole + 2).toString;//计算时长qint64 duration = GB28181Helper::getDuration(startTime, endTime) * 1000;VideoUtil::setDuration(ui->labDuration, ui->sliderPosition, duration);}void frmVideoPlayback::receivePlayFinsh{timer->stop;ui->btnPlay->setText("暂停");VideoUtil::resetDuration(ui->labDuration, ui->labPosition, ui->sliderPosition);//暂停期间不用继续if (ui->btnPlay->text == "播放") {return;}//如果还有下一个自动触发双击播放/过滤下刚刚关闭触发的播放结束int row = ui->listWidget->currentRow;qint64 offset = lastTime.msecsTo(QDateTime::currentDateTime);if (offset > 1000 && row listWidget->count - 1) {ui->listWidget->setCurrentRow(row + 1);on_listWidget_itemDoubleClicked(ui->listWidget->currentItem);}}void frmVideoPlayback::playControl{QString ssrc = ui->gb28181Widget->getSsrcVideo;if (!server || ssrc.isEmpty) {return;}QObject *obj = sender;if (obj == ui->btnPlay) {if (ui->btnPlay->text == "暂停") {ui->btnPlay->setText("播放");server->playControl(deviceId, channelId, PlayControl_Pause, 0, ssrc);} else {ui->btnPlay->setText("暂停");server->playControl(deviceId, channelId, PlayControl_Play, 0, ssrc);}} else if (obj == ui->btnStop) {lastTime = QDateTime::currentDateTime;ui->gb28181Widget->stop;} else if (obj == ui->sliderPosition) {timer->stop;timer->start;ui->btnPlay->setText("暂停");qint64 sec = ui->sliderPosition->value / 1000;server->playControl(deviceId, channelId, PlayControl_Position, sec);} else if (obj == ui->cboxSpeed) {float speed = ui->cboxSpeed->itemData(ui->cboxSpeed->currentIndex).toFloat;server->playControl(deviceId, channelId, PlayControl_Scale, speed, ssrc);}}void frmVideoPlayback::receiveStatus(GB28181Status status){if (status.deviceId != deviceId || status.channelId != channelId || status.notifyType != 121) {return;}//不是当前窗体产生的不用处理if (ui->gb28181Widget->getSsrcVideo == status.ssrc) {ui->gb28181Widget->stop;}}void frmVideoPlayback::receiveRecord(const QList &records){if (!this->isVisible) {return;}foreach (GB28181Record record, records) {QString startTime = record.startTime;QString endTime = record.endTime;QString date = startTime.mid(0, 10);QString start = startTime.mid(11, 5);QString end = endTime.mid(11, 5);QListWidgetItem *item = new QListWidgetItem;item->setData(Qt::UserRole + 1, startTime);item->setData(Qt::UserRole + 2, endTime);item->setText(QString("%0 %1 - %2").arg(date).arg(start).arg(end));ui->listWidget->addItem(item);}}void frmVideoPlayback::on_btnQueryRecord_clicked{ui->listWidget->clear;QDateTime dateStart = ui->dateStart->dateTime;QDateTime dateEnd = ui->dateEnd->dateTime;if (dateStart >= dateEnd) {QtHelper::showMessageBoxError("开始时间必须小于结束时间, 请重新选择!");return;}server->queryRecord(deviceId, channelId, dateStart, dateEnd);}void frmVideoPlayback::on_listWidget_itemDoubleClicked(QListWidgetItem *item){//取出时间QString startTime = item->data(Qt::UserRole + 1).toString;QString endTime = item->data(Qt::UserRole + 2).toString;//停止播放lastTime = QDateTime::currentDateTime;ui->gb28181Widget->stop;qApp->processEvents;timer->start;//启动播放ui->gb28181Widget->initPara(AppConfig::ScaleMode, AppConfig::VideoMode, AppConfig::VideoCore, AppConfig::DecodeType, AppConfig::Hardware, AppConfig::ReadTimeout, false, false);ui->gb28181Widget->setPara(AppConfig::RecordSpeed.toFloat, AppConfig::RecordProfile, (TransmitMode)AppConfig::TransmitMode, AppConfig::ServerIp, AppConfig::RecordPush, GB28181Widget::PlayType_Playback);ui->gb28181Widget->setTime(startTime, endTime);ui->gb28181Widget->openVideo(deviceId, channelId);} 来源：Qt自定义控件
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