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

大招至胜

最新推荐文章于 2022-11-03 23:54:11 发布

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分类专栏： C/C++ 文章标签： fp null file byte 音乐 c

本文链接：https://blog.youkuaiyun.com/devday/article/details/4530912

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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);