mp3 id3v2 中图片数据的获取

最新推荐文章于 2022-11-03 23:54:11 发布

iteye_17686

最新推荐文章于 2022-11-03 23:54:11 发布

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文章标签： php python

本文介绍了一个简单的程序来读取MP3文件中的ID3v2标签信息，特别是如何查找和提取图片（APIC帧）数据。程序首先打开指定路径的MP3文件，检查是否存在ID3v2头部，然后遍历整个标签区域以寻找APIC帧。

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FILE *fp;
BYTE cID3V2_head[10];
long ID3V2_len;
BYTE cID3V2Fra_head[10];
long lID3V2Fra_length;
BYTE *cID3V2Fra;
if ((fp=fopen("//My Documents//我的音乐//never say goodbye.mp3","rb"))==NULL)
{
MessageBox(NULL, _T("have no such file"), _T("notify"), MB_OK);
}
else
{
fread(cID3V2_head, 10, 1, fp);
if ((cID3V2_head[0]=='I'||cID3V2_head[0]=='i')
&&(cID3V2_head[1]=='D'||cID3V2_head[1]=='d')
&&(cID3V2_head[2]=='3'))
{
ID3V2_len = (cID3V2_head[6]&0x7f)<<21
| (cID3V2_head[7]&0x7f)<<14
| (cID3V2_head[8]&0x7f)<<7
| (cID3V2_head[9]&0x7f);
}

//get APIC
while((ftell(fp)+10)<=ID3V2_len)
{
memset(cID3V2Fra_head, 0, 10);
fread(cID3V2Fra_head, 10, 1, fp);

lID3V2Fra_length = (long)(cID3V2Fra_head[4]*0x100000000
+ cID3V2Fra_head[5]*0x10000
+ cID3V2Fra_head[6]*0x100
+ cID3V2Fra_head[7]);

if ((cID3V2Fra_head[0]=='A'||cID3V2Fra_head[0]=='a')
&&(cID3V2Fra_head[1]=='P'||cID3V2Fra_head[1]=='p')
&&(cID3V2Fra_head[2]=='I'||cID3V2Fra_head[2]=='i')
&&(cID3V2Fra_head[3]=='C'||cID3V2Fra_head[3]=='c'))
{

//分配成功
cID3V2Fra = (BYTE *)malloc(lID3V2Fra_length);
if (cID3V2Fra!=NULL)
{
fread(cID3V2Fra, lID3V2Fra_length, 1, fp);
}
break;
}
else
{
fseek(fp, lID3V2Fra_length, SEEK_CUR);
}
}
}
fclose(fp);