//打开MP3里面的相关信息----------------------------------------------------
#include<string.h>
#include<unistd.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
void Tag_GetTrailer(void);
void Tag_GetHeader(void);
#define BLACK 0 //黑色
#define WHITE 0xffff //白色
#define RED 0xff0000 //红色
#define GREEN 0xff00 //绿色
#define BLUE 0xff //蓝色
#define BACK_NULL 1024 //透明
FILE *fp;
char curr_mp3_path[64];
//Tag_header_Start
struct Tag_Header{
char Header[3]; //it must be ID3
char ver[2]; //the version of ID3
char ReVer[2]; //the subversion of ID3
char Flag[2];
char Size[4];
};
//Tag_header_End
//Tag_Trailer_Start
struct Tag_Trailer{
char Header[4];
char Title[31];
char Artist[31];
char Album[31];
char Year[5];
char Comment[32];
char Cenre[2];
};
//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 mp3_kbps; //kbps是指mp3的位数（bit率），位速是指在一个数据流中每秒钟能通过的信息量
int mp3_time; //是指mp3播放时间的总长数，单位是秒
int OpenMP3File(char *path)
{ char mp3_name[128];
memset(&Mp3Header, 0, sizeof(Mp3Header));//清空
memset(&Mp3Trailer, 0, sizeof(Mp3Trailer));
fp=fopen(path,"r+");
strcpy(curr_mp3_path,path);
if(fp==NULL)
{
printf("Can't open file\n");
}
else
{
Tag_GetHeader();
Tag_GetTrailer();
}
#if 1
sprintf(mp3_name, "MP3___Title:%s",Mp3Trailer.Title);
printf("\n%s\n",mp3_name);
lcd_put_ascii_string(120, 50, , GREEN, (unsigned char *)mp3_name);
sprintf(mp3_name, "MP3__Artist:%s",Mp3Trailer.Artist);
printf("%s\n",mp3_name);
lcd_put_ascii_string(120, 70, BACK_NULL, GREEN, (unsigned char *)mp3_name);
sprintf(mp3_name, "MP3___Album:%s",Mp3Trailer.Album);
printf("%s\n",mp3_name);
lcd_put_ascii_string(120, 90, BACK_NULL, GREEN, (unsigned char *)mp3_name);
sprintf(mp3_name, "MP3____Year:%s",Mp3Trailer.Year);
printf("%s\n",mp3_name);
lcd_put_ascii_string(120, 110, BACK_NULL, GREEN, (unsigned char *)mp3_name);
sprintf(mp3_name, "MP3_Comment:%s",Mp3Trailer.Comment);
printf("%s\n",mp3_name);
lcd_put_ascii_string(120, 130, BACK_NULL, GREEN, (unsigned char *)mp3_name);
char tmp_str[10];
sprintf(tmp_str,"time:%d",mp3_time);
printf("%s\n",tmp_str);
lcd_put_ascii_string(110, 170, BACK_NULL, GREEN, (unsigned char *)tmp_str);
sprintf(tmp_str,"KBPS:%d", mp3_kbps);
printf("%s\n",tmp_str);
lcd_put_ascii_string(270, 170, BACK_NULL, GREEN, (unsigned char *)tmp_str);
#endif
return 0;
}
void Tag_GetTrailer(void)
{
int read_bytes;
//get header
fseek(fp,-128L,SEEK_END);
read_bytes = fread(Mp3Trailer.Header,3,1,fp);
Mp3Trailer.Header[3] = 0;
//get title
fseek(fp,-125L,SEEK_END);
read_bytes = fread(Mp3Trailer.Title,20,1,fp);
Mp3Trailer.Title[20] = 0;
//get artist
fseek(fp,-95L,SEEK_END);
read_bytes = fread(Mp3Trailer.Artist,20,1,fp);
Mp3Trailer.Artist[20] = 0;
//get album
fseek(fp,-65L,SEEK_END);
read_bytes = fread(Mp3Trailer.Album,20,1,fp);
Mp3Trailer.Album[20] = 0;
//get year
fseek(fp,-35L,SEEK_END);
read_bytes = fread(Mp3Trailer.Year,4,1,fp);
Mp3Trailer.Year[4] = 0;
//get comment
fseek(fp,-31L,SEEK_END);
read_bytes = fread(Mp3Trailer.Comment,20,1,fp);
Mp3Trailer.Comment[20] = 0;
//get Cenre
fseek(fp,-1L,SEEK_END);
read_bytes = fread(Mp3Trailer.Cenre,1,1,fp);
Mp3Trailer.Cenre[1] = 0;
}
void Tag_GetHeader(void)
{
int read_bytes;
unsigned char ch[2];
unsigned char ch1[4];
ch[1] = 0;
//get ID3 Tag
read_bytes = fread(Mp3Header.Header,sizeof(Mp3Header.Header),1,fp);
//get ID3 version
fseek(fp,3,SEEK_CUR);
read_bytes = fread(Mp3Header.ver,1,1,fp);
//get ID3 Reversion
fseek(fp,4,SEEK_CUR);
read_bytes = fread(Mp3Header.ReVer,sizeof(Mp3Header.ReVer),1,fp);
//get ID3 flag
fseek(fp,5,SEEK_CUR);
read_bytes = fread(Mp3Header.Flag,sizeof(Mp3Header.Flag),1,fp);
//get ID3 size
fseek(fp,6,SEEK_CUR);
read_bytes = fread(Mp3Header.Size,sizeof(Mp3Header.Size),1,fp);
fseek(fp,0,SEEK_SET);
while(1)
{
read_bytes = fread(ch, 1, 1,fp);
if(ch[0] == 0xff)
{
read_bytes = fread(ch, 1, 1,fp);
if(ch[0] == 0xfb)
{
printf("yes\n");
break;
}
}
ch[1] = 0;
}
read_bytes = fread(ch1, 3, 1,fp);
printf("bytes:::%x %x %x",ch1[0],ch1[1],ch1[2]);
ch[0] = (ch1[0] >> 4) & 0x0f;
double label[16] = {0,32,40,48,56,64,80,96,112,128,160,192,224,256,320};
printf("\n%f KBPS\n",label[ch[0]]);
mp3_kbps = (int)label[ch[0]];
ch[1] = (ch1[0] >> 2) & 0x03;
double label1[4] = {44100, 48000, 32000};
printf("\n%fHZ\n",label1[ch[1]]);
double ff;
int ff1;
double ff2;
ff = (double)(1152.00 / label1[ch[1]]) * label[ch[0]]*1000/8;
printf("ff = %f\n",ff);
printf("ff = %d\n",(int)ff);
ff1 = (int)ff;
if(ff1%8 != 0)
ff2 = (ff1/8 + 1)*8;
else
ff2 = ff1;
printf("%f \n", ff2);
struct stat f_stat;
double f_size = 0;
if(stat(curr_mp3_path, &f_stat) == -1)
printf("stat err\n");
else
{
printf("%ld\n", f_stat.st_size);
f_size = (double)f_stat.st_size;
printf("%f\n", f_size);
}
mp3_time = (int)(f_size/ff2*0.0263);
printf("%d", mp3_time);
}
//mp3的路径名由main函数的参数提供
int main(char argv, char** argc)
{
if(argv == 1)
{
printf("input mp3 file name\n");
return 0;
}
OpenMP3File(argc[1]);
return 0;
}