嵌入式GEC6818利用多线程实现视频播放器

基于粤嵌6818的视频播放器

一、创建管道文件

//创建管道文件
int create_fifo()
{
 //检测管道文件是否存在，不存在就创建
 int ret=access("/tmp/fifo",F_OK);
 {
  if(ret == 0)
  {
   printf("fifo has exist\n");
  }
  else if(ret == -1)
  {
   mkfifo("/tmp/fifo",0777); //创建管道文件
   
  }
 
 }
 
 int fifo_fd=open("/tmp/fifo",O_RDWR);  //打开管道文件
 if(fifo_fd == -1)
 {
  perror("open fifo failed");
  return -1;
  
 }
 
 return fifo_fd;
 
}

二、利用slave命令写入管道文件

//把slave命令写入管道文件
int slave_write_cmd(int fifo_fd,char *cmd)
{
 write(fifo_fd,cmd,strlen(cmd));
 return 0;
 
}

三、进行视频播放功能

//视频播放功能
void show_video()
{
 BmpNode *list=D_R_List_Create();  //链表初始化
 Search_Dir_Avi(list,"./avi");     //检索目录下的AVI文件并将文件名存入链表中
 BmpNode *p=list->next;
 
 Show_Bmp(800, 480,0, 0, "./video.bmp");  //显示视频主界面
 fifo_fd=create_fifo();
 int video_stop_cont_flags=1;
 
 int play_flag = 0;
 pid_t pid;
 pid = fork();  //创建子线程
 if(pid==0)
 {
  while(1)
  {
   execl("./mplayer", "./mplayer", "-slave", "-quiet", "input file=/tmp/fifo", "zoom", "-x", "700", "-y", "420", "geometry", "0:0", "p->data", NULL);
  }
 }
 
 while(1)
 {
     Get_Slide();
 
  //视频播放
  if(ts_x1>370 && ts_x1<425 && ts_y1>420 && ts_y1<480)
  {
   if(play_flag == 0) //当前是播放状态
   {
    kill(pid, SIGSTOP);  //子进程暂停
    play_flag = 1;
   }
   else
   {
    kill(pid, SIGCONT);  //子进程继续
    play_flag = 0; 
   }
    
  }
  
  //视频退出
  if(ts_x1>700 && ts_x1<800 && ts_y1>0 && ts_y1<60)
  {
   //杀死当前子进程
   kill(pid , SIGKILL);
   Show_Bmp(800, 480, 0, 0, "func.bmp");
   close(fifo_fd);
   break;
   
  }
  
  //播放上一个视频
  if(ts_x1>250 && ts_x1<300 && ts_y1>420 && ts_y1<480)
  {
   //杀死当前子进程
   kill(pid , SIGKILL);
   
   p=p->prev;
   if(p==list)
   {
    p=p->prev;
   }
   //创建新的子进程去播放上一首
   pid = fork();
   if(pid == 0)
   {
    execl("./mplayer", "./mplayer", "-slave", "-quiet", "input file=/tmp/fifo", "zoom", "-x", "700", "-y", "420", "geometry", "0:0", "p->data", NULL);  
   }
  }
  
  //播放下一个视频
  if(ts_x1>500&&ts_x1<550 && ts_y1>420&&ts_y1<480)
  {
   //杀死当前子进程
   kill(pid , SIGKILL);
   
   p=p->next;;
   if(p==list)
   {
    p=p->next;
   }
   //创建新的子进程去播放上一首
   pid = fork();
   if(pid == 0)
   {
    execl("./mplayer", "./mplayer", "-slave", "-quiet", "input file=/tmp/fifo", "zoom", "-x", "700", "-y", "420", "geometry", "0:0", "p->data", NULL);    
   }
   
  }
  
  //视频快进
  if(ts_x1>440&&ts_x1<490 && ts_y1>420&&ts_y1<480)
  {
   
   slave_write_cmd(fifo_fd,"seek +5\n");
   
  }
  
  //视频快退
  if(ts_x1>310&&ts_x1<360 && ts_y1>420&&ts_y1<480)
  {
   
   slave_write_cmd(fifo_fd,"seek -5\n");
   
  }
  
  //音量增加
  if(ts_x1>70&&ts_x1<110 && ts_y1>420&&ts_y1<480)
  {
   slave_write_cmd(fifo_fd,"volume +200\n");
  }
  
  //音量减少
  if(ts_x1>120&&ts_x1<160 && ts_y1>420&&ts_y1<480)
  {
   slave_write_cmd(fifo_fd,"volume -200\n");
  }
  
  //暂停/继续
  if(ts_x1>560&&ts_x1<610 && ts_y1>420&&ts_y1<480)
  {
   
   if(video_stop_cont_flags == 1)
   {
    slave_write_cmd(fifo_fd,"pause\n");
    video_stop_cont_flags=2;
   }
   else if(video_stop_cont_flags == 2)
   {
    slave_write_cmd(fifo_fd,"pause\n");
    video_stop_cont_flags=1;
    
   }
   
  }
  
  //视频静音
  if(ts_x1>690&&ts_x1<740 && ts_y1>420&&ts_y1<480)
  {
   slave_write_cmd(fifo_fd,"mute\n");
  }
 }
}