简易mp3播放器(SDL)

本文是根据http://blog.csdn.net/pennyshe/article/details/6553888修改的，在此声明！

写一个简单的mp3播放器，去掉了界面。有个问题就是不能自动播放下一曲。

 注：需要安装SDL2-2.0.3、SDL2_mixer-2.0.0http://www.libsdl.org/projects/SDL_mixer和smpeghttp://download.csdn.net/detail/zdf511391565/8025611（播放mp3用的）

具体安装方法详见：http://blog.csdn.net/gameboy12615/article/details/5723836

mp3编码器（LAME）：http://sourceforge.net/projects/lame/files/lame

  gcc -o mp3SDLplay mp3SDLplay.c -L/usr/lib -lSDL2 -lSDL2_mixer

  ./mp3SDLplay /home/armmlinux/Music/huomiao.mp3 or

./mp3SDLplay /home/armmlinux/Music/*.mp3

 

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <signal.h>
 #include "SDL2/SDL.h"
 #include "SDL2/SDL_mixer.h"
 char songlist[50][50];
 Mix_Music *music = NULL;
 int sum ,playing;
 int quit;
 int Sdl_init()
 {
     if( SDL_Init(SDL_INIT_AUDIO)<0){
         fprintf(stderr,"Couldn't Initialize SDL: %s/n",SDL_GetError());
             return 0;
     }

 //  int audio_rate = 22050;
     int audio_rate = 44100;
     Uint16 audio_format = AUDIO_S16SYS;
 //  Uint16 audio_format = AUDIO_S16;
     int audio_channels = 2;
     int audio_buffers = 4096;
 //  int audio_buffers = 1024;
     int audio_volume = MIX_MAX_VOLUME;
     char channeltype[][10] = {"","mono","stereo","surround"};
     if(Mix_OpenAudio(audio_rate, audio_format, audio_channels,audio_buffers)<0){
         fprintf(stderr,"Couldn't Open Audio: %s/n",SDL_GetError());
         return 0;
     }
     Mix_QuerySpec(&audio_rate,&audio_format,&audio_channels);
     Mix_VolumeMusic(audio_volume);
     Mix_SetMusicCMD(getenv("MUSIC_CMD"));
     fprintf(stdout,"Open Audio at %d Hz,%d bit,%s (%s),%d bytes buffer/n",audio_rate,audio_format& 0xFF ,channeltype[audio_channels],(audio_format&0x1000)?"BE":"LE",audio_buffers);
     return 1;
 }
 void PlayMusic(int track)
 {
     if(track<0 || track >=sum){
         fprintf(stderr,"Input Error/n");
         return ;
     }
     if(Mix_PlayingMusic()){
         Mix_FadeOutMusic(1000);
         SDL_Delay(1000);
     }
     if(music != NULL)
         Mix_FreeMusic(music);

     music = NULL;
     music = Mix_LoadMUS(songlist[track]);
     if(music == NULL){
         fprintf(stderr,"Couldn't load %s: %s",songlist[track],SDL_GetError());
         return ;
     }
     if(Mix_FadeInMusic(music,-1,2000) == -1){
         fprintf(stderr,"Couldn't Play %s: %s",songlist[track],SDL_GetError());
         return ;
     }
     fprintf(stdout,"Now Playing ♪♫♫♪ %s/n",songlist[track]);
     playing = track;
 }
 void PlayNext()
 {
     PlayMusic((playing+1)%sum);
 }
 void PlayPrevious()
 {
     PlayMusic((playing-1+sum)%sum);
 }
 void SetVolume(int vol)
 {
     if(vol < 0 || vol > MIX_MAX_VOLUME){
         fprintf(stderr,"Volume Value Error.(0 - %d)/n", MIX_MAX_VOLUME); return ;
     }
     Mix_VolumeMusic(vol);
 }
 void PauseMusic()
 {
     if(Mix_PlayingMusic())
         Mix_PauseMusic();
 }
 void ResumeMusic()
 {
     if(Mix_PausedMusic())
         Mix_ResumeMusic();
     else if(!Mix_PlayingMusic())
         PlayMusic(playing);
 }
 void StopMusic()
 {
     if(Mix_PlayingMusic())
         Mix_HaltMusic();
 }
 void ListMusic()
 {
     int i;
     fprintf(stdout,"***********SONGLIST*************/n");
     for(i=0;i<sum;i++)
         fprintf(stdout,"%d: %s/n",i+1,songlist[i]);
     fprintf(stdout,"********************************/n");
 }
 void PrintCliInfo()
 {
         fprintf(stdout,"*************HELP***************\n");       fprintf(stdout,"      p(pause) c(continue)\n");       fprintf(stdout,"      f(previous) n(next)\n");       fprintf(stdout,"      l(list) t#(play#)\n");       fprintf(stdout,"      s(stop)     v#(volume:0~%d)\n",MIX_MAX_VOLUME);       fprintf(stdout,"      h(help) d#(delete#))\n");       fprintf(stdout,"      q(quit)\n");       fprintf(stdout,"********************************\n");

 }
 void PrintHelpInfo()
 {
         fprintf(stdout,"Uage：easymp3 [option]... [file]...\n");       fprintf(stdout,"[option]\n");       fprintf(stdout,"--help\tprintf help and quit!\n");

 }
 void Control()
 {
     PlayMusic(playing);
     char cmd[20];
     int i;
     while(!quit){
         fprintf(stdout,"Enter :");
         fscanf(stdin,"%s",cmd);
         switch(*cmd){
             case 'q':
                 Mix_HaltMusic();
                 quit = 1;
                 break;
             case 'n':
                 PlayNext();
                 break;
             case 'p':
                 PauseMusic();
                 break;
             case 'c':
                 ResumeMusic();
                 break;
             case 's':
                 StopMusic();
                 break;
             case 'f':
                 PlayPrevious();
                 break;
             case 'h':
                 PrintCliInfo();
                 break;
             case 'd':
                 for(i=atoi(cmd+1);i<sum;i++)
                     strcpy(songlist[i-1],songlist[i]);
                 sum--;
                 break;
             case 't':
                 PlayMusic(atoi(cmd+1)-1);
                 break;
             case 'l':
                 ListMusic();
                 break;
             case 'v':
                 Mix_VolumeMusic(atoi(cmd+1));
                 break;
             default:
                 break;
         }
     }
 }
 void FreeSDL()
 {
     if(Mix_PlayingMusic())
         Mix_HaltMusic();
     if( music != NULL){
         Mix_FreeMusic(music);
         music = NULL;
     }
     Mix_CloseAudio();
     SDL_Quit();
 }
 int main(int argc, char *argv[])
 {
     quit = 0;
     int i;
     for(i=1; i<argc &&  *argv[i] == '-'; i++ ){
         if(!strcmp(argv[i],"--help")){
             PrintHelpInfo();
             return 0;
         }
     }
     if(i>=argc){
         PrintHelpInfo();
         return 0;
     }
     if(!Sdl_init()){
         return 0;
     }
     for(sum=0;i<argc;i++,sum++)
         strcpy(songlist[sum],argv[i]);
     playing = 0;
     PrintCliInfo();
     Control();
     FreeSDL();
     return 0;
 }