简易mp3播放器(SDL)

来源：互联网发布：js上下移动div 编辑：程序博客网时间：2024/05/22 09:39
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
[cpp] view plaincopy
#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;  
}  
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