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HomeDatabaseMysql Tutorial[MP3学习]MP3标签信息之ID3v1,IDv2

近来本着踏实努力一点一滴的原则,研究了下MP3,准备做一个了类于AIRPLAY的播放器,这是学习的第一篇,读取信息,做一个笔记。 参考资料:http://www.id3.org/ID3v1 http://en.wikipedia.org/wiki/ID3 ====================================================

       近来本着踏实努力一点一滴的原则,研究了下MP3,准备做一个了类似于AIRPLAY的播放器,这是学习的第一篇,读取信息,做一个笔记。

参考资料:http://www.id3.org/ID3v1       http://en.wikipedia.org/wiki/ID3

========================================================================

MP3歌曲信息(ID3v1)结构如下:

[MP3学习]MP3标签信息之ID3v1,IDv2

所以需要一个结构体存储MP3的歌曲信息,一般声明如下:

struct MP3INFO	//MP3的信息结构,固定的,存放在歌曲最后128个字节中
{   
    char     identify[3];          // TAG
    char     Title[30];            // 歌曲名,30个字节   
    char     Artist[30];           // 歌手名,30个字节   
    char     Album[30];         // 所属唱片,30个字节   
    char     Year[4];             // 年份,4个字符   
    char     Comment[30];   // 注释,28个字节,有些说是30个,但都没啥关系,只是保留位的大小要改改  
    char     reserved[1];	//保留,暂无用
};

知道了这些就很容易了,不敢用什么办法,只要读取到最后的128个字节,所有的相关信息就可以得到了,用VC6.0控制台程序测试如下(主代码):

#include "stdafx.h"


struct MP3INFO	//MP3的信息结构,固定的,存放在歌曲最后128个字节中
{   
    char     identify[3];          // TAG
    char     Title[30];            // 歌曲名,30个字节   
    char     Artist[30];           // 歌手名,30个字节   
    char     Album[30];         // 所属唱片,30个字节   
    char     Year[4];             // 年份,4个字符   
    char     Comment[30];   // 注释,28个字节,有些说是30个,但都没啥关系,只是保留位的大小要改改  
    char     reserved[1];	//保留,暂无用
};


int main(int argc, char* argv[])
{
	printf("读取一个MP3的信息,每个MP3的最后128个字节存储的,它有固定的结构,下面试读取之!\n");
	MP3INFO mp3;

	FILE *pf = fopen("H:/1.mp3","r");
	printf("打开文件:%d\n",pf);

	fseek(pf,-128,SEEK_END);
	fread(&mp3,sizeof(mp3),1,pf);

	printf("TAG标志:%s\n",mp3.identify);
	printf("曲名:%s\n",mp3.Title);
	printf("歌手:%s\n",mp3.Artist);
	printf("唱片:%s\n",mp3.Album);
	printf("年份:%s\n",mp3.Year);
	printf("注释:%s\n",mp3.Comment);

	fclose(pf);

	return 0;
}

效果如下:

[MP3学习]MP3标签信息之ID3v1,IDv2


读取的任务完成了。对于修改,知道了这些再做完善也很容易:(如下)

memset(&mp3,0,sizeof(mp3));
	printf("修改信息:\n");
	mp3.Identify[0]='T';
	mp3.Identify[1]='A';
	mp3.Identify[2]='G';
	
	mp3.Flag='0';
	mp3.Track='5';
	mp3.Style='3';
	
	lstrcpy(mp3.Title,(LPCTSTR)"修改的名字");
	lstrcpy(mp3.Artist,(LPCTSTR)"修改的作者");
	lstrcpy(mp3.Album,(LPCTSTR)"修改的唱片");
	lstrcpy(mp3.Year,(LPCTSTR)"1989");
	lstrcpy(mp3.Comment,(LPCTSTR)"修改的注释");
	
	fseek(pf,-128,SEEK_END);
	fwrite(&mp3,sizeof(mp3),1,pf);

修改完成后,在UltraEdit中查看(16进制),信息格式完全正确。但是,用Windows自带的属性查看发现,其上面的内容不全是我们修改的,这是为什么呢?

经多方查找 http://en.wikipedia.org/wiki/ID3,http://baike.baidu.com/view/66078.html

/*
 * ID3v1是固定的128个字节,这个你不用担心。其实ID3v1是这样安排的:如果MP3的注释是大于28个字节的,那么就要借用126-127两个字节。
 * 所以ID3v1的注释部分可能是28个字节也可能是30个字节。那么,怎么区分到底是28个字节还是30个字节呢?很简单,126处就是管这个的,
 * 我们只要看看126处是不是0x00,如果是0x00那么注释就有28个字节。如果不等于0x00,那么就是说注释是30个字节。同时别忘了,
 * 由于第127字节存储了Track信息,那么如果注释是30个字节的时候,这首歌的ID3v1里的那个127处的信息自然就不是Track信息了。
 * Track自然就是没有地方存了,所以127处变的没有Track意义了,它只是Comment的一部分了。
 */
struct ID3v1	//MP3的信息结构,固定的,存放在歌曲最后128个字节中
{   
    char     Identify[3];   // ID3v1为TAG
    char     Title[30];     // 歌曲名,30个字节   
    char     Artist[30];    // 歌手名,30个字节   
    char     Album[30];     // 所属唱片,30个字节   
    char     Year[4];       // 年份,4个字符   
    char     Comment[28];   // 注释,28个字节,有时是30个,  
    char     Flag;			// 标志,为0说明有音轨(下一位),不一定有
	char	 Track;			// 音轨,#,歌曲号,不一定有
char	 Style;			// 风格流派,需要查询,不一定有
};

所以对读写取程序做些修改:
void ReadID3v1(char* pfile)
{
	printf("读取一个MP3的信息,每个MP3的最后128个字节存储的,它有固定的结构,下面试读取之!\n");
	ID3v1 mp3;
	
	FILE *pf = fopen(pfile,"r+");
	printf("打开文件:%d\n",pf);
	
	fseek(pf,-128,SEEK_END);
	fread(&mp3,sizeof(mp3),1,pf);
	if (mp3.Identify[0]!='T' || mp3.Identify[1]!='A' || mp3.Identify[2]!='G' )
	{
		printf("此歌曲不支持ID3v2标准!\n");
		fclose(pf);
		
		return;
	}
	printf("TAG标志:%.3s\n",mp3.Identify);
	printf("曲名:%.30s\n",mp3.Title);
	printf("歌手:%.30s\n",mp3.Artist);
	printf("唱片:%.30s\n",mp3.Album);
	printf("年份:%.4s\n",mp3.Year);
	printf("注释:%.30s\n",mp3.Comment);
	if (mp3.Flag==0)
	{
		printf("歌曲序号:%d,流派标志:%d\n",mp3.Track,mp3.Style);
	}
	
	getchar();

	//下面试着修改信息
	memset(&mp3,0,sizeof(mp3));
	printf("修改信息:\n");
	mp3.Identify[0]='T';
	mp3.Identify[1]='A';
	mp3.Identify[2]='G';
	
	mp3.Flag='0';
	mp3.Track='5';
	mp3.Style='3';
	
	lstrcpy(mp3.Title,(LPCTSTR)"修改的名字");
	lstrcpy(mp3.Artist,(LPCTSTR)"修改的作者");
	lstrcpy(mp3.Album,(LPCTSTR)"修改的唱片");
	lstrcpy(mp3.Year,(LPCTSTR)"1989");
	lstrcpy(mp3.Comment,(LPCTSTR)"修改的注释");
	
	fseek(pf,-128,SEEK_END);
	fwrite(&mp3,sizeof(mp3),1,pf);
	printf("over,%s\n",mp3.Title);
	
	fclose(pf);
}

http://blog.csdn.net/bbdxf/article/details/7438006











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