//读取Mp3文件头部和尾部的信息

时间：2009-04-09 来源：creatory

//读取Mp3文件头部和尾部的信息
MP3的文件头长10Byte,主要保存ID3,ID3版本和副版本信息,以及Flag和帧长的信息
尾部的128字节保存了Header(尾部头,3Byte),Title(歌曲名称,30Byte),Artilst(艺术家,30Byte),Album(专辑,30Byte),Year(发行年份,4Byte),Comment(评论,30Byte),Cenre(?,1Byte) 3+30+30+30+4+30+1=128
#include <stdio.h>
FILE *fp;
//Tag_header_Start
struct Tag_header{
char Header[3]; //it must be ID3
char ver;            //the version of ID3
char ReVer;      //the subversion of ID3
char Flag;
char Size[4];
};
//Tag_header_End //Tag_Trailer_Start
struct Tag_Trailer{
char Header[3];
char Title[30];
char Artist[30];
char Album[30];
char Year[4];
char Comment[30];
char Cenre[1];
};
//Tag_Trailer_End
//定义结构体变量,文件头和文件尾
struct Tag_Header Mp3Header;
struct Tag_Trailer Mp3Trailer; int main(int argc,char **argv){
fp=fopen("test.mp3","r+");
if(fp==NULL)
{
  printf("Can't open file\n");
}
else
{
  Tag_GetHeader();
  Tag_GetTrailer();
}

printf("\n%s\n",Mp3Trailer.Title);
printf("%s\n",Mp3Trailer.Artist);
printf("%s\n",Mp3Trailer.Album);
printf("%s\n",Mp3Trailer.Year);
printf("%s\n",Mp3Trailer.Comment);
fclose(fp);
return 0;
}
void Tag_GetTrailer(void){
//get header
fseek(fp,-128L,SEEK_END);
fread(Mp3Trailer.Header,3,1,fp);

//get title
fseek(fp,-125L,SEEK_END);
fread(Mp3Trailer.Title,30,1,fp);

//get artist
fseek(fp,-95L,SEEK_END);
fread(Mp3Trailer.Artist,30,1,fp);

//get album
fseek(fp,-65L,SEEK_END);
fread(Mp3Trailer.Album,30,1,fp);

//get year
fseek(fp,-35L,SEEK_END);
fread(Mp3Trailer.Year,4,1,fp);

//get comment
fseek(fp,-31L,SEEK_END);
fread(Mp3Trailer.Comment,30,1,fp);

//get Cenre
fseek(fp,-1L,SEEK_END);
fread(Mp3Trailer.Cenre,1,1,fp);
}
void Tag_GetHeader(void){
//get ID3 Tag
fseek(fp,0,SEEK_SET);
fread(Mp3Header.Header,sizeof(Mp3Header.Header),1,fp);

//get ID3 version
fseek(fp,3,SEEK_CUR);
fread(Mp3Header.ver,sizeof(Mp3Header.ver),1,fp);

//get ID3 Reversion
fseek(fp,4,SEEK_CUR);
fread(Mp3Header.Rever,sizeof(Mp3Header.Rever),1,fp);

//get ID3 flag
fseek(fp,5,SEEK_CUR);
fread(Mp3Header.Flag,sizeof(Mp3Header.Flag),1,fp);

//get ID3 size
fseek(fp,6,SEEK_CUR);
fread(Mp3Header.Size,sizeof(Mp3Header.Size),1,fp); }

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