读取MP3专辑图片 

  1 #define WIN32_LEAN_AND_MEAN
  2 #define NOWINRES
  3 #define NOSERVICE
  4 #define NOMCX
  5 #define NOIME
  6 #include "windows.h"
  7 
  8 #include <stdio.h>
  9 #include <malloc.h>
 10 
 11 #define TAG_SIZE(a) (((a)[0]&0x7F)*0x200000 + ((a)[1]&0x7F)*0x4000 + ((a)[2]&0x7F)*0x80 + ((a)[3]&0x7F))
 12 #define FME_SIZE(a) ((a)[0]*0x1000000 + (a)[1]*0x10000 + (a)[2]*0x100 + (a)[3])
 13 
 14 #pragma pack(1)
 15 
 16 struct ID3V2Header
 17 {
 18     BYTE Header[3];
 19     BYTE Version;
 20     BYTE reVersion;
 21     BYTE Flag;
 22     BYTE Size[4];
 23 };
 24 
 25 struct ID3V2Frame
 26 {
 27     BYTE FrameID[4];
 28     BYTE Size[4];
 29     BYTE Flag[2];
 30 };
 31 
 32 #pragma pack()
 33 
 34 BOOL WINAPI ExtractAlbum(const char *inputFile, const char *outputFile)
 35 {
 36     FILE *f = fopen(inputFile, "rb");
 37 
 38     if (!f)
 39         return FALSE;
 40 
 41     BOOL success = FALSE;
 42 
 43     ID3V2Header hdr;
 44 
 45     if (fread(&hdr, sizeof(hdr), 1, f) != 1)
 46         goto err;
 47 
 48     if (memcmp(hdr.Header, "ID3", 3))
 49         goto err;
 50 
 51     while (!feof(f))
 52     {
 53         if (ftell(f) - sizeof(hdr) >= TAG_SIZE(hdr.Size))
 54             break;
 55 
 56         ID3V2Frame frame;
 57 
 58         if (fread(&frame, sizeof(frame), 1, f) != 1)
 59             break;
 60 
 61         if (!memcmp(frame.FrameID, "APIC", 4))
 62         {
 63             size_t pos = ftell(f);
 64 
 65             int ofs = fgetc(f) ? 7 : 2;
 66 
 67             while (fgetc(f)) {}
 68 
 69             fseek(f, ofs, SEEK_CUR);
 70 
 71             size_t len = (pos + FME_SIZE(frame.Size)) - ftell(f);
 72 
 73             void *buf = malloc(len);
 74 
 75             if (fread(buf, len, 1, f) == 1)
 76             {
 77                 FILE *fpic = fopen(outputFile, "wb");
 78 
 79                 if (fpic)
 80                 {
 81                     fwrite(buf, len, 1, fpic);
 82                     fclose(fpic);
 83 
 84                     success = TRUE;
 85                 }
 86             }
 87 
 88             free(buf);
 89 
 90             continue;
 91         }
 92 
 93         fseek(f, FME_SIZE(frame.Size), SEEK_CUR);
 94     }
 95 
 96 err:
 97     fclose(f);
 98 
 99     return success;
100 }

 

posted @ 2016-06-27 20:02  Akatsuki-  阅读(525)  评论(0)    收藏  举报