(6) FFmpeg+SDL视频播放器-图形界面版
代码记录

// testplayermfcDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "testplayermfc.h"
#include "testplayermfcDlg.h"
#include "afxdialogex.h"

#define __STDC_CONSTANT_MACROS

extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "sdl/SDL.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
    enum { IDD = IDD_ABOUTBOX };

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CtestplayermfcDlg 对话框




CtestplayermfcDlg::CtestplayermfcDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CtestplayermfcDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CtestplayermfcDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
    DDX_Control(pDX, IDC_URL, m_url);
}

BEGIN_MESSAGE_MAP(CtestplayermfcDlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_PLAY, &CtestplayermfcDlg::OnBnClickedPlay)
    ON_BN_CLICKED(IDC_PAUSE, &CtestplayermfcDlg::OnBnClickedPause)
    ON_BN_CLICKED(IDC_STOP, &CtestplayermfcDlg::OnBnClickedStop)
    ON_BN_CLICKED(IDC_ABOUT, &CtestplayermfcDlg::OnBnClickedAbout)
    ON_BN_CLICKED(IDC_FILEDIALOG, &CtestplayermfcDlg::OnBnClickedFiledialog)
END_MESSAGE_MAP()


int screen_w,screen_h;

//Refresh Event
#define REFRESH_EVENT  (SDL_USEREVENT + 1)
//Break
#define BREAK_EVENT  (SDL_USEREVENT + 2)

int thread_exit=0;
int thread_pause=0;

int refresh_video(void *opaque){
    thread_exit=0;
    while (thread_exit==0) {
        if(thread_pause==0){
        SDL_Event event;
        event.type = REFRESH_EVENT;
        SDL_PushEvent(&event);
        }
        SDL_Delay(40);
    }
    thread_exit=0;
    //Break
    SDL_Event event;
    event.type = BREAK_EVENT;
    SDL_PushEvent(&event);
    return 0;
}

UINT ffmpegplayer(LPVOID lpParam)
{
    AVFormatContext *pFormatCtx;
    int             i, videoindex;
    AVCodecContext  *pCodecCtx;
    AVCodec         *pCodec;
    AVFrame *pFrame,*pFrameYUV;
    uint8_t *out_buffer;
    AVPacket *packet;
    int y_size;
    int ret, got_picture;
    struct SwsContext *img_convert_ctx;

    //输入文件路径
    CtestplayermfcDlg *dlg=(CtestplayermfcDlg *)lpParam;
    //------------------------
    char filepath[500]={0};
    GetWindowTextA(dlg->m_url,(LPSTR)filepath,500);
    //------------------------
    //char filepath[]="Titanic.ts";

    int frame_cnt;

    av_register_all();//注册所有组件
    avformat_network_init();
    pFormatCtx = avformat_alloc_context();

    if(avformat_open_input(&pFormatCtx,filepath,NULL,NULL)!=0){//打开输入视频文件
        printf("Couldn't open input stream.\n");
        return -1;
    }
    if(avformat_find_stream_info(pFormatCtx,NULL)<0){//获取视频文件信息
        printf("Couldn't find stream information.\n");
        return -1;
    }
    videoindex=-1;
    for(i=0; i<pFormatCtx->nb_streams; i++) 
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
            videoindex=i;
            break;
        }
    if(videoindex==-1){
        printf("Didn't find a video stream.\n");
        return -1;
    }

    pCodecCtx=pFormatCtx->streams[videoindex]->codec;
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);//查找解码器
    if(pCodec==NULL){
        printf("Codec not found.\n");
        return -1;
    }
    if(avcodec_open2(pCodecCtx, pCodec,NULL)<0){//打开解码器
        printf("Could not open codec.\n");
        return -1;
    }

    pFrame=av_frame_alloc();
    pFrameYUV=av_frame_alloc();
    out_buffer=(uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
    avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
    packet=(AVPacket *)av_malloc(sizeof(AVPacket));
    //Output Info-----------------------------
    printf("--------------- File Information ----------------\n");
    av_dump_format(pFormatCtx,0,filepath,0);
    printf("-------------------------------------------------\n");
    img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, 
        pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); 

    frame_cnt=0;


    //=======SDL=======
    if(SDL_Init(SDL_INIT_VIDEO)) {  
        printf( "Could not initialize SDL - %s\n", SDL_GetError()); 
        return -1;
    } 

    SDL_Window *screen; 
    //SDL 2.0 Support for multiple windows
    screen_w=pCodecCtx->width;
    screen_h=pCodecCtx->height;
    //screen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
    //  screen_w, screen_h,SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);

    screen = SDL_CreateWindowFrom(dlg->GetDlgItem(IDC_SCREEN)->GetSafeHwnd());
    if(!screen) {  
        printf("SDL: could not create window - exiting:%s\n",SDL_GetError());  
        return -1;
    }
    SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0);  

    Uint32 pixformat=0;
    //IYUV: Y + U + V  (3 planes)
    //YV12: Y + V + U  (3 planes)
    pixformat= SDL_PIXELFORMAT_IYUV;  

    SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer,pixformat, SDL_TEXTUREACCESS_STREAMING,pCodecCtx->width,pCodecCtx->height);

    SDL_Rect sdlRect;

    SDL_Thread *refresh_thread = SDL_CreateThread(refresh_video,NULL,NULL);
    SDL_Event event;

    while(1){
        //Wait
        SDL_WaitEvent(&event);
        if(event.type==REFRESH_EVENT){
            while(1){
                if(av_read_frame(pFormatCtx, packet)<0)//从输入文件读取一帧压缩数据
                    thread_exit=1;

                if(packet->stream_index==videoindex)//只处理视频帧
                    break;
            }
            /*
            * 在此处添加输出H264码流的代码
            * 取自于packet，使用fwrite()
            */
            ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);//解码一帧压缩数据
            if(ret < 0){
                printf("Decode Error.\n");
                return -1;
            }
            if(got_picture){
                //此处是为了将右边多出来的黑边（硬件导致的）裁剪掉，pFrame->pFrameYUV
                sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, 
                    pFrameYUV->data, pFrameYUV->linesize);
                printf("Decoded frame index: %d\n",frame_cnt);

                SDL_UpdateTexture( sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0]);  
                //FIX: If window is resize
                sdlRect.x = 0;  
                sdlRect.y = 0;  
                sdlRect.w = screen_w;  
                sdlRect.h = screen_h;  
                SDL_RenderClear( sdlRenderer );   
                SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, NULL);  
                SDL_RenderPresent( sdlRenderer );

                frame_cnt++;

            }
            av_free_packet(packet);
        }
        else if(event.type==SDL_WINDOWEVENT){
            //If Resize
            SDL_GetWindowSize(screen,&screen_w,&screen_h);
        }else if(event.type==SDL_KEYDOWN){
            //Pause
            if(event.key.keysym.sym==SDLK_SPACE)
                thread_pause=!thread_pause;
        }else if(event.type==SDL_QUIT){
            thread_exit=1;
        }else if(event.type==BREAK_EVENT){
            break;
        }
    }

    sws_freeContext(img_convert_ctx);

    SDL_Quit();
    
    dlg->GetDlgItem(IDC_SCREEN)->ShowWindow(SW_SHOWNORMAL);

    //------------
    av_frame_free(&pFrameYUV);
    av_frame_free(&pFrame);
    avcodec_close(pCodecCtx);//关闭解码器
    avformat_close_input(&pFormatCtx);//关闭输入视频文件
    
    return 0;
}


// CtestplayermfcDlg 消息处理程序

BOOL CtestplayermfcDlg::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 != NULL)
    {
        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 CtestplayermfcDlg::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 CtestplayermfcDlg::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 CtestplayermfcDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}



void CtestplayermfcDlg::OnBnClickedPlay()
{
    CString str1;
    m_url.GetWindowText(str1);
    if(str1.IsEmpty()){
        AfxMessageBox("请输入文件路径！");
        return;
    }
    AfxBeginThread(ffmpegplayer,this);//开启线程
}


void CtestplayermfcDlg::OnBnClickedPause()
{
    thread_pause=!thread_pause;
}


void CtestplayermfcDlg::OnBnClickedStop()
{
    thread_exit=1;
}


void CtestplayermfcDlg::OnBnClickedAbout()
{
    CAboutDlg dlg1;
    dlg1.DoModal();
}


void CtestplayermfcDlg::OnBnClickedFiledialog()
{
    //CString str1;
    //m_url.GetWindowText(str1);
    //str1.Format("%s",avcodec_configuration());
    //AfxMessageBox(str1);
    CString FilePathName;
    CFileDialog dlg(TRUE,NULL,NULL,NULL,NULL);
    if(dlg.DoModal()==IDOK) {
        FilePathName=dlg.GetPathName();
        m_url.SetWindowTextA(FilePathName);
    }
}

dlg