使用SDL 2.0.20 Simple DirectMedia Layer - SDL version 2.0.20 (stable)https://www.libsdl.org/release/SDL2-devel-2.0.20-VC.zip
参考文章：
ffmpeg tutorial
学习文章的同时基于ffmpeg 4.4 和 sdl 2.0 做同样功能的mfc demo。
可以先参考：CSDN
在制作播放器时，我们将使用 SDL 来输出媒体文件的音频和视频。 SDL 是一个出色的跨平台多媒体库，可用于 MPEG 播放软件、模拟器和许多视频游戏。您需要为您的系统下载并安装 SDL 开发库，以便编译本教程中的程序。
所以我们目前的计划是替换教程 1 中的 Saveframe() 函数，而是将我们的帧输出到屏幕上。但首先我们必须先了解如何使用 SDL 库。首先，我们必须包含库并初始化 SDL：
参考SDL2源代码分析1：初始化（SDL_Init()）_雷霄骅(leixiaohua1020)的专栏-CSDN博客_sdl_init
使用SDL 播放一个视频代码流程大体如下：
初始化：
1、SDL_Init() 初始化SDL
2、SDL_CreateWindow(): 创建窗口
3、SDL_CreateRenderer() 基于窗口创建渲染器
4、SDL_CreateTexture() 创建纹理
循环渲染数据
SDL_UpdateTexture 设置纹理的数据
SDL_RenderCopy 纹理复制给渲染器
SDL_RenderPresent 显示
// MFCAudioResampleDlg.cpp: 实现文件//#include "pch.h"#include "framework.h"#include "MFCAudioResample.h"#include "MFCAudioResampleDlg.h"#include "afxdialogex.h"#include #include //Refresh Event#define REFRESH_EVENT (SDL_USEREVENT + 1)#define BREAK_EVENT (SDL_USEREVENT + 2)std::string GetFFmpegErorString(int errnum){static CHAR g_av_error[AV_ERROR_MAX_STRING_SIZE] = { 0 };return std::string(av_make_error_string(g_av_error, AV_ERROR_MAX_STRING_SIZE, errnum));}void msgBoxFFmpegError(int errnum){::MessageBoxA(0, 0, GetFFmpegErorString(errnum).c_str(), 0);}std::wstring GetoneFile(BOOL bOpen = TRUE){CString FilePathName;CFileDialog dlg(bOpen, NULL, NULL, NULL, NULL);//TRUE为OPEN对话框，FALSE为SAVE AS对话框 if (dlg.DoModal() == IDOK) {//清空FilePathName = dlg.GetPathName();}return std::wstring(FilePathName.GetBuffer());}#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()// CMFCAudioResampleDlg 对话框CMFCAudioResampleDlg::CMFCAudioResampleDlg(CWnd* pParent ): CDialogEx(IDD_MFCAUDIORESAMPLE_DIALOG, pParent){m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINframe);}void CMFCAudioResampleDlg::DoDataExchange(CDataExchange* pDX){CDialogEx::DoDataExchange(pDX);DDX_Control(pDX, IDC_EDIT_INPUT_FILE, m_targetFilePath);}BEGIN_MESSAGE_MAP(CMFCAudioResampleDlg, CDialogEx)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTTON_CHOOSE_FILE, &CMFCAudioResampleDlg::OnBnClickedButtonChooseFile)END_MESSAGE_MAP()// CMFCAudioResampleDlg 消息处理程序BOOL CMFCAudioResampleDlg::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// TODO: 在此添加额外的初始化代码return TRUE; // 除非将焦点设置到控件，否则返回 TRUE}void CMFCAudioResampleDlg::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 CMFCAudioResampleDlg::onPaint(){if (IsIconic()){CPaintDC dc(this); // 用于绘制的设备上下文SendMessage(WM_ICONERASEBKGND, reinterpret_cast(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 CMFCAudioResampleDlg::onQueryDragIcon(){return static_cast(m_hIcon);}void CMFCAudioResampleDlg::Saveframe(AVframe* pframe, int width, int height, int iframe){m_frame = pframe;SDL_Event event;event.type = REFRESH_EVENT;SDL_PushEvent(&event);}void CMFCAudioResampleDlg::onBnClickedButtonChooseFile(){if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) {assert(false);}// TODO: 在此添加控件通知处理程序代码auto target = GetoneFile();m_targetFilePath.SetWindowTextW(target.c_str());UpdateData(TRUE);CString strTargetWindowText;m_targetFilePath.GetWindowTextW(strTargetWindowText);AVFormatContext* avFormatContext = avformat_alloc_context();USES_CONVERSION;if (!PathFileExists(strTargetWindowText.GetBuffer())) {return;}auto result = avformat_open_input(&avFormatContext, W2A((strTargetWindowText.GetBuffer())), nullptr, nullptr);if (result < 0) {assert(false);}result = avformat_find_stream_info(avFormatContext, NULL);if (result < 0){assert(false);}av_dump_format(avFormatContext, 0, NULL, 0);// Find the first video streamint videoStream = -1;for (int i = 0; i < avFormatContext->nb_streams; i++)if (avFormatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {videoStream = i;break;}if (videoStream == -1)return ; // Didn't find a video streamAVCodecContext* avCodecContext = avcodec_alloc_context3(NULL);result = avcodec_parameters_to_context(avCodecContext, avFormatContext->streams[videoStream]->codecpar);if (result < 0){assert(false);}avCodecContext->pkt_timebase = avFormatContext->streams[videoStream]->time_base;AVCodec* codec = avcodec_find_decoder(avCodecContext->codec_id);avCodecContext->codec_id = codec->id;result = avcodec_open2(avCodecContext, codec, nullptr);if (result < 0){msgBoxFFmpegError(result);assert(false);}m_sdlThread = std::move(std::thread([this, avCodecContext]() {m_sdlWindow = SDL_CreateWindow("sdl display", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, avCodecContext->width, avCodecContext->height, SDL_WINDOW_OPENGL);assert(m_sdlWindow);m_sdlRender = SDL_CreateRenderer(m_sdlWindow, -1, 0);assert(m_sdlRender);m_sdlTexture = SDL_CreateTexture(m_sdlRender, SDL_PixelFormatEnum::SDL_PIXELFORMAT_RGB24, SDL_TextureAccess::SDL_TEXTUREACCESS_STREAMING, avCodecContext->width, avCodecContext->height);assert(m_sdlTexture);SDL_Event event;while (1){SDL_WaitEvent(&event);if (event.type == REFRESH_EVENT) {SDL_UpdateTexture(m_sdlTexture, nullptr, m_frame->data[0], avCodecContext->width * 3);SDL_Rect sdlRect = {};sdlRect.x = 0;sdlRect.y = 0;sdlRect.h = avCodecContext->height;sdlRect.w = avCodecContext->width;SDL_RenderClear(m_sdlRender);SDL_RenderCopy(m_sdlRender, m_sdlTexture, nullptr, &sdlRect);SDL_RenderPresent(m_sdlRender);}else if (event.type == SDL_WINDOWEVENT) {}else if (event.type == SDL_QUIT) {}else if (event.type == BREAK_EVENT) {break;}}}));AVframe* pframe = nullptr;pframe = av_frame_alloc();// 我们最终的目的是将原始视频帧存储为24-bit RGB 视频。AVframe* pframeRGB24 = av_frame_alloc();uint8_t* bufferRawRGB24 = nullptr;const int numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, avCodecContext->width, avCodecContext->height, 1);bufferRawRGB24 = (uint8_t*)av_malloc(numBytes * sizeof(uint8_t));av_image_fill_arrays(pframeRGB24->data, pframeRGB24->linesize, bufferRawRGB24, AV_PIX_FMT_RGB24, avCodecContext->width, avCodecContext->height, 1);// 读取数据// sws_ctx 定义了从pix_fmt 到 AV_PIX_FMT_RGB24的转换struct SwsContext* sws_ctx = NULL;int frameFinished;// initialize SWS context for software scalingsws_ctx = sws_getContext(avCodecContext->width,avCodecContext->height,avCodecContext->pix_fmt,avCodecContext->width,avCodecContext->height,AV_PIX_FMT_RGB24,SWS_BILINEAR,NULL,NULL,NULL);int i = 0;AVPacket packet;bool bReadEof = false;while (true){Sleep(33);int readResult = -1;if (!bReadEof){readResult = av_read_frame(avFormatContext, &packet);if (readResult < 0) {::MessageBoxA(0, 0, GetFFmpegErorString(readResult).c_str(), 0);bReadEof = true;}else if (readResult == 0) {static int iCnt = 0;if (packet.stream_index == videoStream) {++iCnt;}CString str;str.Format(L"cunt[%d]rn", iCnt);OutputDebugStringW(str.GetBuffer());}}if (bReadEof){// 需要给刷空avcodec_send_packet(avCodecContext, NULL);}else{// Is this a packet from the video stream?if (packet.stream_index == videoStream) {// Decode video frameavcodec_send_packet(avCodecContext, &packet);}}int receiveResult = avcodec_receive_frame(avCodecContext, pframe);// Did we get a video frame?if (receiveResult == 0) {// Convert the image from its native format to RGBsws_scale(sws_ctx, (uint8_t const* const*)pframe->data,pframe->linesize, 0, avCodecContext->height,pframeRGB24->data, pframeRGB24->linesize);++i;Saveframe(pframeRGB24, avCodecContext->width,avCodecContext->height, i);}else if (receiveResult == AVERROR_EOF){::MessageBoxA(0, 0, "read eof", 0);SDL_Event event;event.type = BREAK_EVENT;SDL_PushEvent(&event);break;}else if(receiveResult == AVERROR(EAGAIN)){if (bReadEof) {break;}else {}}else {msgBoxFFmpegError(receiveResult);}// Free the packet that was allocated by av_read_frameif(readResult == 0)av_packet_unref(&packet);}SDL_Quit();av_frame_free(&pframe);av_frame_free(&pframeRGB24);av_free(bufferRawRGB24);avcodec_close(avCodecContext);avformat_close_input(&avFormatContext);}
完整项目ffmpegsdl2.0rgb24player-互联网文档类资源-CSDN下载