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获取IPC摄像机视频流一般使用GB28181或者RTSP协议，这两款协议是比较常见的；两者都有开源的库，下面介绍如何使用RTSP获取进行IPC视频流；

• 准备库

ffmepg是个开源的库,该库集成了rtsp协议，可以直接使用；首先需要编译该库，看使用的编译的平台或者编译工具，编译对应的库即可，如何编译，网上有很多方法，可以参考下，我们代码里面也会提供VS2017编译的库，可以直接使用；

window播放使用SDL库，怎么编译使用网上可以参考下；我们代码里面也会提供VS2017编译的库，可以直接使用；

• 新建工程

这里使用的是VS2017进行编译；

（1）、新建工程，选择MFC应用程序；

（2）、选择基于对话框

（3）、配置编译环境

• 代码实施

// rtspplayDlg.cpp: 实现文件
//#include "stdafx.h"
#include "rtspplay.h"
#include "rtspplayDlg.h"
#include "afxdialogex.h"#ifdef _DEBUG
#define new DEBUG_NEW
#endif// 用于应用程序“关于”菜单项的 CAboutDlg 对话框class CAboutDlg : public CDialogEx
{
public:CAboutDlg();// 对话框数据
#ifdef AFX_DESIGN_TIMEenum { IDD = IDD_ABOUTBOX };
#endifprotected:virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持// 实现
protected:DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{CDialogEx::DoDataExchange(pDX);
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()// CrtspplayDlg 对话框CrtspplayDlg::CrtspplayDlg(CWnd* pParent /*=nullptr*/): CDialogEx(IDD_RTSPPLAY_DIALOG, pParent)
{m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CrtspplayDlg::DoDataExchange(CDataExchange* pDX)
{CDialogEx::DoDataExchange(pDX);DDX_Control(pDX, IDC_STATIC_VIDEO, m_staVideo);
}BEGIN_MESSAGE_MAP(CrtspplayDlg, CDialogEx)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDOK, &CrtspplayDlg::OnBnClickedOk)ON_BN_CLICKED(IDCANCEL, &CrtspplayDlg::OnBnClickedCancel)ON_BN_CLICKED(IDC_BUTTON_STOPPLAY, &CrtspplayDlg::OnBnClickedButtonStopplay)
END_MESSAGE_MAP()// CrtspplayDlg 消息处理程序BOOL CrtspplayDlg::OnInitDialog()
{CDialogEx::OnInitDialog();// 将“关于...”菜单项添加到系统菜单中。// IDM_ABOUTBOX 必须在系统命令范围内。ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != nullptr){BOOL bNameValid;CString strAboutMenu;bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);ASSERT(bNameValid);if (!strAboutMenu.IsEmpty()){pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);}}// 设置此对话框的图标。  当应用程序主窗口不是对话框时，框架将自动//  执行此操作SetIcon(m_hIcon, TRUE);			// 设置大图标SetIcon(m_hIcon, FALSE);		// 设置小图标WSADATA Ws;if (WSAStartup(MAKEWORD(2, 2), &Ws) != 0) {return FALSE;}static BOOL sbInitFfmpeg = FALSE;if (FALSE == sbInitFfmpeg) {avformat_network_init();sbInitFfmpeg = TRUE;}return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}void CrtspplayDlg::OnSysCommand(UINT nID, LPARAM lParam)
{if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialogEx::OnSysCommand(nID, lParam);}
}// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。  对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。void CrtspplayDlg::OnPaint()
{if (IsIconic()){CPaintDC dc(this); // 用于绘制的设备上下文SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);// 使图标在工作区矩形中居中int cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// 绘制图标dc.DrawIcon(x, y, m_hIcon);}else{CDialogEx::OnPaint();}
}//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CrtspplayDlg::OnQueryDragIcon()
{return static_cast<HCURSOR>(m_hIcon);
}void CrtspplayDlg::OnBnClickedOk()
{if (mbRunning == FALSE) {mbRunning = TRUE;m_pVideoPlayWorker = AfxBeginThread((AFX_THREADPROC)VideoPlayThread, (LPVOID)this);((CButton*)GetDlgItem(IDOK))->EnableWindow(FALSE);}else {AfxMessageBox(L"正在播放");}//CDialogEx::OnOK();
}void CrtspplayDlg::OnBnClickedCancel()
{if (mbRunning == TRUE) {AfxMessageBox(L"请先停止播放");return;}CDialogEx::OnCancel();
}DWORD __cdecl CrtspplayDlg::VideoPlayThread(LPVOID pParam)
{CrtspplayDlg *pd = (CrtspplayDlg*)pParam;pd->RtspPlay();return 0;
}// Rtsp播放线程
void CrtspplayDlg::RtspPlay()
{int nTimeoutCnt = 0;CStringW strUrl;GetDlgItem(IDC_EDIT_RTSPADDR)->GetWindowText(strUrl);;//char filepath[] = "rtsp://xmygkj:7290@192.168.199.45/streaming?transportmode=unicast&amp;profile=Profile_13";//char filepath[] = "rtsp://xmygkj:7290@192.168.199.61/streaming?transportmode=unicast&amp;profile=Profile_17";//初始化m_pFormatCtx = avformat_alloc_context();AVDictionary* options = NULL;//av_dict_set(&options, "buffer_size", "1024000", 0); //设置缓存大小,1080p可将值跳到最大av_dict_set(&options, "rtsp_transport", "udp", 0); //以udp的方式打开,av_dict_set(&options, "stimeout", "5000000", 0); //设置超时断开链接时间，单位usav_dict_set(&options, "max_delay", "500000", 0); //设置最大时延m_pPacket = (AVPacket *)av_malloc(sizeof(AVPacket));USES_CONVERSION;//打开网络流或文件流if (avformat_open_input(&m_pFormatCtx, W2A(strUrl), NULL, &options) != 0) {AfxMessageBox(L"打开网络流失败\n");return;}//查找码流信息if (avformat_find_stream_info(m_pFormatCtx, NULL) < 0) {AfxMessageBox(L"查找码流信息失败\n");return;}//查找码流中是否有视频流int videoindex = -1;for (unsigned i = 0; i < m_pFormatCtx->nb_streams; i++) {if (m_pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {videoindex = i;break;}}if (videoindex == -1) {AfxMessageBox(L"找不到码流信息\n");return;}if (FALSE == InitFfmpeg()) {return;}//保存一段的时间视频，写到文件中while (mbRunning) {if (av_read_frame(m_pFormatCtx, m_pPacket) >= 0) {nTimeoutCnt = 0;int ret = 0;ret = avcodec_send_packet(m_pCodecCtx, m_pPacket);ret = avcodec_receive_frame(m_pCodecCtx, m_pFrame);if ((ret == 0) && (m_pCodecCtx->width > 0) && (m_pCodecCtx->height > 0)) {if (m_img_convert_ctx == NULL) {m_img_convert_ctx = sws_getContext(m_pCodecCtx->width, m_pCodecCtx->height, m_pCodecCtx->pix_fmt,m_stSdlRect.w, m_stSdlRect.h, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);m_nWidth = m_pCodecCtx->width;m_nHeight = m_pCodecCtx->height;}else {if ((m_pCodecCtx->width != m_nWidth) || (m_pCodecCtx->height != m_nHeight)) {if (m_img_convert_ctx != NULL) {sws_freeContext(m_img_convert_ctx);m_img_convert_ctx = sws_getContext(m_pCodecCtx->width, m_pCodecCtx->height, m_pCodecCtx->pix_fmt,m_stSdlRect.w, m_stSdlRect.h, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);m_nWidth = m_pCodecCtx->width;m_nHeight = m_pCodecCtx->height;}}}sws_scale(m_img_convert_ctx, (const uint8_t* const*)m_pFrame->data, m_pFrame->linesize, \0, m_pCodecCtx->height, m_pFrameYUV->data, m_pFrameYUV->linesize);SDL_UpdateYUVTexture(m_pSdlTexture, &m_stSdlRect,m_pFrameYUV->data[0], m_pFrameYUV->linesize[0],m_pFrameYUV->data[1], m_pFrameYUV->linesize[1],m_pFrameYUV->data[2], m_pFrameYUV->linesize[2]);SDL_RenderClear(m_pSdlRenderer);//SDL_RenderCopy( sdlRenderer, sdlTexture, &m_stSdlRect, &m_stSdlRect );  SDL_RenderCopy(m_pSdlRenderer, m_pSdlTexture, NULL, &m_stSdlRect);SDL_Rect sRect;memcpy(&sRect, &m_stSdlRect, sizeof(SDL_Rect));SDL_SetRenderDrawColor(m_pSdlRenderer, 0x00, 0x00, 0x00, 0x00);SDL_RenderPresent(m_pSdlRenderer);}av_packet_unref(m_pPacket);}else {Sleep(500);nTimeoutCnt++;if (nTimeoutCnt > 5) {AfxMessageBox(L"超时断开");}mbRunning = FALSE;}}SDL_RenderClear(m_pSdlRenderer);SDL_SetRenderDrawColor(m_pSdlRenderer, 0x00, 0x00, 0x00, 0x00);SDL_RenderPresent(m_pSdlRenderer);ReleaseFfmpeg();mbRunning = FALSE;
}BOOL CrtspplayDlg::InitFfmpeg()
{m_pCodec = (AVCodec*)avcodec_find_decoder(AV_CODEC_ID_H264);if (m_pCodec == NULL) {AfxMessageBox(L"找不到编码器");return FALSE;}m_pCodecCtx = avcodec_alloc_context3(m_pCodec);m_pCodecCtx->flags |= AV_CODEC_FLAG_LOW_DELAY;if (avcodec_open2(m_pCodecCtx, m_pCodec, nullptr) < 0) {AfxMessageBox(L"打开编码器失败");return FALSE;}m_pFrame = av_frame_alloc();m_pParser = av_parser_init(AV_CODEC_ID_H264);CRect staRect;m_staVideo.GetWindowRect(&staRect);m_stSdlRect.w = staRect.right - staRect.left;m_stSdlRect.h = staRect.bottom - staRect.top;m_pFrameYUV = av_frame_alloc();m_pOutBuffer = (uint8_t *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, m_stSdlRect.w, m_stSdlRect.h, 1));av_image_fill_arrays(m_pFrameYUV->data, m_pFrameYUV->linesize, m_pOutBuffer, AV_PIX_FMT_YUV420P, m_stSdlRect.w, m_stSdlRect.h, 1);SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);//显示在MFC控件上m_pScreen = SDL_CreateWindowFrom(m_staVideo.GetSafeHwnd());if (!m_pScreen) {AfxMessageBox(L"创建窗体失败");return FALSE;}m_pSdlRenderer = SDL_CreateRenderer(m_pScreen, -1, 0);if (!m_pSdlRenderer) {AfxMessageBox(L"无法创建窗体");return FALSE;}//IYUV: Y + U + V  (3 planes)//YV12: Y + V + U  (3 planes)m_pSdlTexture = SDL_CreateTexture(m_pSdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, m_stSdlRect.w, m_stSdlRect.h);if (!m_pSdlTexture) {AfxMessageBox(L"创建纹理失败");return FALSE;}return TRUE;
}void CrtspplayDlg::ReleaseFfmpeg()
{//FIX Small Bug//SDL Hide Window When it finishedif (m_pFormatCtx != NULL) {avformat_close_input(&m_pFormatCtx);av_free(m_pFormatCtx);m_pFormatCtx = NULL;}if (NULL == m_pPacket) {av_free(m_pPacket);m_pPacket = NULL;}if (m_pSdlRenderer != NULL) {SDL_DestroyRenderer(m_pSdlRenderer);m_pSdlRenderer = NULL;}if (m_pSdlTexture != NULL) {SDL_DestroyTexture(m_pSdlTexture);m_pSdlTexture = NULL;}if (m_pScreen != NULL) {SDL_DestroyWindow(m_pScreen);m_pScreen = NULL;}if (m_img_convert_ctx != NULL) {sws_freeContext(m_img_convert_ctx);m_img_convert_ctx = NULL;}if (NULL != m_pFrameYUV) {av_frame_free(&m_pFrameYUV);m_pFrameYUV = NULL;}if (NULL != m_pCodecCtx) {avcodec_close(m_pCodecCtx);avcodec_free_context(&m_pCodecCtx);m_pCodecCtx = NULL;}if (m_pOutBuffer != NULL) {av_free(m_pOutBuffer);m_pOutBuffer = NULL;}
}void CrtspplayDlg::OnBnClickedButtonStopplay()
{mbRunning = FALSE;((CButton*)GetDlgItem(IDOK))->EnableWindow(TRUE);
}

• 成果