说明

  • 默认的sdl播放文件会单独弹出一个窗口，如果嵌在qt的界面上需要修改代码如下

    1.   screen = SDL_CreateWindowFrom((void *)label->winId());
    2.   //screen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
    3.   //    screen_w, screen_h, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);

    代码

    ```cpp QtPlayerOne::QtPlayerOne(QWidget *parent) : QWidget(parent) , ui(new Ui::QtPlayerOne) { ui->setupUi(this); this->setFixedSize(661,465); label = new QLabel(this); label->resize(601,381); label->move(30,20); rect = label->geometry();//记录widget位置，恢复时使用 isplay = false;

    start_btn = new QPushButton(“btn1” ,this); connect(start_btn,&QPushButton::clicked,this,&QtPlayerOne::start_play); }

QtPlayerOne::~QtPlayerOne() { delete start_btn; delete ui; }

const int bpp = 12; int screen_w = 640, screen_h = 360; const int pixel_w = 640, pixel_h = 360; unsigned char buffer[pixel_w pixel_h bpp / 8];

void QtPlayerOne::start_play() { if (SDL_Init(SDL_INIT_VIDEO)) { qDebug() << “Could not initialize SDL”; return; }

  1. SDL_Window* screen;
  2. //SDL 2.0 Support for multiple windows
  3. screen = SDL_CreateWindowFrom((void *)label->winId());
  4. //screen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
  5. //    screen_w, screen_h, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
  6. if (!screen) {
  7.     printf("SDL: could not create window - exiting:%s\n", SDL_GetError());
  8.     return;
  9. }
  10. SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
  12. Uint32 pixformat = 0;
  13. //IYUV: Y + U + V  (3 planes)
  14. //YV12: Y + V + U  (3 planes)
  15. pixformat = SDL_PIXELFORMAT_IYUV;
  17. SDL_Texture* sdlTexture1 = SDL_CreateTexture(sdlRenderer, pixformat, SDL_TEXTUREACCESS_STREAMING, pixel_w, pixel_h);
  21. FILE* fp = nullptr;
  22. fp = fopen("F:/qt-code/build-QtPlayerOne-Desktop_Qt_5_12_10_MinGW_64_bit-Debug/debug/sintel_640_360.yuv", "rb+");
  23. if (fp == nullptr)
  24. {
  25.     std::cout << "fopen error" << std::endl;
  26.     return;
  27. }
  29. if (fp == NULL) {
  30.     printf("cannot open this file\n");
  31.     return;
  32. }
  34. SDL_Rect sdlRect;
  36. while (1)
  37. {
  38.     if (fread(buffer, 1, pixel_w * pixel_h * bpp / 8, fp) != pixel_w * pixel_h * bpp / 8) {
  39.         // Loop
  40.         fseek(fp, 0, SEEK_SET);
  41.         fread(buffer, 1, pixel_w * pixel_h * bpp / 8, fp);
  42.     }
  44.     SDL_UpdateTexture(sdlTexture1, NULL, buffer, pixel_w);
  48.     SDL_RenderClear(sdlRenderer);
  50.     sdlRect.x = 0;
  51.     sdlRect.y = 0;
  52.     sdlRect.w = screen_w/2;
  53.     sdlRect.h = screen_h/2;
  54.     SDL_RenderCopy(sdlRenderer, sdlTexture1, NULL, &sdlRect);
  56.     sdlRect.x = screen_w / 2;
  57.     sdlRect.y = 0;
  58.     sdlRect.w = screen_w / 2;
  59.     sdlRect.h = screen_h / 2;
  60.     SDL_RenderCopy(sdlRenderer, sdlTexture1, NULL, &sdlRect);
  62.     sdlRect.x = 0;
  63.     sdlRect.y = screen_h / 2;
  64.     sdlRect.w = screen_w / 2;
  65.     sdlRect.h = screen_h / 2;
  66.     SDL_RenderCopy(sdlRenderer, sdlTexture1, NULL, &sdlRect);
  68.     sdlRect.x = screen_w / 2;
  69.     sdlRect.y = screen_h / 2;
  70.     sdlRect.w = screen_w / 2;
  71.     sdlRect.h = screen_h / 2;
  72.     SDL_RenderCopy(sdlRenderer, sdlTexture1, NULL, &sdlRect);
  74.     SDL_RenderPresent(sdlRenderer);
  75.     //Delay 40ms
  76.     SDL_Delay(40);
  77.     std::cout << "delay 40ms" << std::endl;
  79. }
  80. SDL_DestroyTexture(sdlTexture1);
  82. SDL_DestroyRenderer(sdlRenderer);
  83. SDL_DestroyWindow(screen);
  84. SDL_Quit();

} ```