C語言實現音樂播放器

#include <stdio.h>
#include<dirent.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>


typedef struct node_ node_t;
struct node_{
  char* name;//gequming
  node_t * prev;
  node_t * next;
};

node_t *head = NULL;
int first=1;//diyicibofnag
node_t * cur =NULL;//dangqianbofang
 


enum{STOP,PAUSE,PLAY};
int status = STOP;


void List_init(void){
 head = malloc(sizeof(node_t));
    memset(head,0x00,sizeof(node_t));
    head->next = head->prev=head;
}

void list_insert(const char* name){
  node_t *p = malloc(sizeof(node_t));
  memset(p,0x00,sizeof(node_t));

  p->name = malloc
 
(strlen(name)+1);
  strcpy(p->name,name);

  p->next = head->next;
  p->prev = head;
  head->next->prev = p;
  head->next = p;
}


int menu(void){
  printf("*************menu************************\n");
  printf("1.  play/pause\n");
  printf("2.  next\n");
  printf("3.  prev\n");
  printf
 
("4.  stop\n");
  printf("5.  exit\n");
  printf("**************************************\n");
  list_show();
  int choose =4;

  do{

     printf(" > ");
  scanf("%d",&choose);
  if(choose>=0&&choose<=4)
    break;
    printf("choose invalid\n");
    while(getchar()!='\n');
    }while(1);
    return choose;
}

void list_show(void){
  node_t *p = head->next;
  while(p!=head){
    printf("%s ",p->name);
     if(p==cur)
    printf("<<==cur");
    printf("\n");
    p = p->next;
 }
}


void load_music(const char * path){
   DIR * pdir = opendir(path);
  if(pdir == NULL){
    perror("opendir");
    exit(1);
}
struct dirent * p = NULL;
while((p=readdir(pdir))!=NULL){

if(p->d_name[0]=='.')
   continue;
   list_insert(p->d_name);
}

closedir(pdir);
}

void playPause(){
   if(first==1){
      char buf[1024] = {};
      sprintf(buf,"madplay -o wav:- ./music/Music/%s 2> /dev/null | aplay 2>/dev/null &",cur->name);
      system(buf);
      first = 0;
      status =  PLAY;
    }else{
     if(status==PLAY){
        system("killall -SIGSTOP aplay");
        status = PAUSE;
      }else if(status==PAUSE){
        system("killall -SIGCONT aplay");
        status = PLAY;
      }
  }
}
void stop(){
   system("killall -SIGKILL aplay");
   first=1;
}
void next(){
    stop();
    cur = cur ->next;
    if(cur==head){
      cur = cur->next;
 }
     playPause();
}
void prev(){
   stop();
   cur = cur->prev;
   if(cur==head){
    cur= cur->prev;
  }
   playPause();
}


int main(int args,char * argv[])
{
 List_init();
 load_music("./music/Music");
if(head->next!=head)
     cur = head->next;
 //printf("%s\n",cur->name);
 //list_show();
 do{
  int choose = menu();
  switch(choose){
    case 1:
          playPause();
          break;
    case 2:
         next();
         break;
    case 3:
         prev();
         break;
    case 4:
        stop();
        break;
    case 0:
        printf("thanks");
        system("killall -SIGKILL aplay");
        exit(0);
        break;
     default:
        break;
        //do nothing;
     }
}while(1);
 return 0;
}