C: Linux C 编程 - SDL视频处理

播放YUV格式的视频

此程序支持显示yuv420p，yuvj420p格式的YUV视频。其他格式的YUV视频没测试。

#include<stdio.h>
#include<string.h>
#include<SDL_video.h>
#include<SDL_render.h>
#include<SDL_surface.h>
#include<SDL_events.h>

int main(int argc, char **argv)
{
  char *filename;
  FILE *fp = NULL;
  
  SDL_Window *pWin;
  int width = 640;
  int height = 360;

  SDL_Renderer *renderer;
  SDL_Texture *texture;
  SDL_Rect rect;

  int pix_width;
  int pix_height;
  // sample bit size
  int sample_bit_size = 12;// 24 * 8; // 12; 1;

  int center = 0;
  int full_screen = 0;

  unsigned char *buf;
  int buf_size;

  SDL_Event e;
  int exit = 0;

  if (argc < 4)
  {
    fprintf(stderr, "invalid args.\n");
    return 1;
  }
  filename = argv[1];
  sscanf(argv[2], "%d", &pix_width);
  sscanf(argv[3], "%d", &pix_height);
  if (argc == 5)
  {
    char* param = argv[4];
    if (strcmp(param, "--center") == 0)
    {
      center = !center;
    }
  }
  if (argc == 6)
  {
    char* param = argv[5];
    if (strcmp(param, "--full-screen") == 0)
    {
      full_screen = !full_screen;
    }
  }

  if (pix_width <= 0 || pix_height <= 0)
  {
    fprintf(stderr, "invalid arg: pix width or height.\n");
    return 1;
  }

  if (pix_width > width)
  {
    width = pix_width;
  }
  if (pix_height > height)
  {
    height = pix_height;
  }
  fprintf(stdout, "video: %s, pixel: width=%d, height=%d, window: width=%d, height=%d, full screen:%s.\n", filename, pix_width, pix_height, width, height, full_screen ? "yes" : "no");

  pWin = SDL_CreateWindow("Player", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_MAXIMIZED); // SDL_WINDOW_FULLSCREEN, SDL_WINDOW_RESIZABLE
  if (pWin == NULL)
  {
    fprintf(stderr, "create window err.\n");
    return 1;
  }

  SDL_GetWindowSize(pWin, &width, &height);
  fprintf(stdout, "video: %s, pixel: width=%d, height=%d, window: width=%d, height=%d, full screen:%s.\n", filename, pix_width, pix_height, width, height, full_screen ? "yes" : "no");


  renderer = SDL_CreateRenderer(pWin, -1, 0);
  if (renderer == NULL) 
  {
    fprintf(stderr, "create renderer err: %s\n", SDL_GetError());
    return 1;
  }

  texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, pix_width, pix_height);
  //texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YUY2, SDL_TEXTUREACCESS_STREAMING, pix_width, pix_height);
  //texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_UYVY, SDL_TEXTUREACCESS_STREAMING, pix_width, pix_height);
  //texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_YVYU, SDL_TEXTUREACCESS_STREAMING, pix_width, pix_height);
  if (texture == NULL) 
  {
    fprintf(stderr, "create texture err: %s\n", SDL_GetError());
    return 1;
  }

  fp = fopen(filename, "rb+");
  if (fp == NULL) 
  {
    fprintf(stderr, "open err: %s\n", filename);
    return 1;
  }

  buf_size = pix_width * pix_height * sample_bit_size / 8;
  buf = (unsigned char *) malloc(buf_size + 1);
  while (1)
  {
    if (fread(buf, buf_size, 1, fp) != 1) 
    {
      if (feof(fp))
      {
        break;
      }
      continue;
    }
    SDL_UpdateTexture(texture, NULL, buf, pix_width);
    rect.x = center ? (width - pix_width) / 2 : 0;
    rect.y = center ? (height - pix_height) / 2 : 0;
    rect.w = full_screen ? width : pix_width;
    rect.h = full_screen ? height : pix_height;

    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, texture, NULL, &rect);
    SDL_RenderPresent(renderer);

    SDL_Delay(40);
  }

  while (! exit)
  {
  
    while (SDL_PollEvent(&e))
    {
      if (e.type == SDL_QUIT)
      {
        exit = 1;
      }
    }
  }

  SDL_DestroyWindow(pWin);
  SDL_Quit();
  return 0;
}

编译

这里一次性完成编译链接。编译的时候注意通过“-I”指定头文件目录，在链接的时候通过“-L”指定要链接的静态库文件目录，以及通过“-l”指定要链接的静态库。

 

gcc -I D:\sbin\usr\local\sdl\include\SDL2 -L D:\sbin\usr\local\sdl\lib sdl_video_test.c -o sdl_video_test -lSDL2

 

运行

在运行之前SDL2.dll拷贝到程序目录下：

>cp -rf d:\sbin\usr\local\sdl\bin\SDL2.dll .

 

.\sdl_video_test H:\\IMG_0024-pix_fmt_yuvj420p_320x180.yuv 320 180

.\sdl_video_test H:\\IMG_0024-pix_fmt_yuvj420p_320x568.yuv 320 568

 

.\sdl_video_test H:\\IMG_0024-pix_fmt_yuvj420p_320x180.yuv 320 180 --center

.\sdl_video_test H:\\IMG_0024-pix_fmt_yuvj420p_320x568.yuv 320 568 --center

 

.\sdl_video_test H:\\IMG_0024-pix_fmt_yuvj420p_320x180.yuv 320 180 --center --full-screen 

.\sdl_video_test H:\\IMG_0024-pix_fmt_yuvj420p_320x568.yuv 320 568 --center --full-screen