apps/metadata/spc.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Dave Chapman
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <ctype.h>
  25 #include <inttypes.h>
  26
  27 #include "system.h"
  28 #include "metadata.h"
  29 #include "metadata_common.h"
  30 #include "metadata_parsers.h"
  31 #include "debug.h"
  32 #include "rbunicode.h"
  33
  34 bool get_spc_metadata(int fd, struct mp3entry* id3)
  35 {
  36     /* Use the trackname part of the id3 structure as a temporary buffer */
  37     unsigned char * buf = (unsigned char *)id3->path;
  38     int read_bytes;
  39     char * p;
  40
  41     unsigned long length;
  42     unsigned long fade;
  43     bool isbinary = true;
  44     int i;
  45
  46     /* try to get the ID666 tag */
  47     if ((lseek(fd, 0x2e, SEEK_SET) < 0)
  48         || ((read_bytes = read(fd, buf, 0xD2)) < 0xD2))
  49     {
  50         DEBUGF("lseek or read failed\n");
  51         return false;
  52     }
  53
  54     p = id3->id3v2buf;
  55
  56     id3->title = p;
  57     buf[31] = 0;
  58     p = iso_decode(buf, p, 0, 32);
  59     buf += 32;
  60
  61     id3->album = p;
  62     buf[31] = 0;
  63     p = iso_decode(buf, p, 0, 32);
  64     buf += 48;
  65
  66     id3->comment = p;
  67     buf[31] = 0;
  68     p = iso_decode(buf, p, 0, 32);
  69     buf += 32;
  70
  71     /* Date check */
  72     if(buf[2] == '/' && buf[5] == '/')
  73         isbinary = false;
  74
  75     /* Reserved bytes check */
  76     if(buf[0xD2 - 0x2E - 112] >= '0' &&
  77        buf[0xD2 - 0x2E - 112] <= '9' &&
  78        buf[0xD3 - 0x2E - 112] == 0x00)
  79         isbinary = false;
  80
  81     /* is length & fade only digits? */
  82     for (i=0;i<8 && (
  83         (buf[0xA9 - 0x2E - 112+i]>='0'&&buf[0xA9 - 0x2E - 112+i]<='9') ||
  84         buf[0xA9 - 0x2E - 112+i]=='\0');
  85         i++);
  86     if (i==8) isbinary = false;
  87
  88     if(isbinary) {
  89         id3->year = buf[0] | (buf[1]<<8);
  90         buf += 11;
  91
  92         length = (buf[0] | (buf[1]<<8) | (buf[2]<<16)) * 1000;
  93         buf += 3;
  94
  95         fade = (buf[0] | (buf[1]<<8) | (buf[2]<<16) | (buf[3]<<24));
  96         buf += 4;
  97     } else {
  98         char tbuf[6];
  99
 100         buf += 6;
 101         buf[4] = 0;
 102         id3->year = atoi(buf);
 103         buf += 5;
 104
 105         memcpy(tbuf, buf, 3);
 106         tbuf[3] = 0;
 107         length = atoi(tbuf) * 1000;
 108         buf += 3;
 109
 110         memcpy(tbuf, buf, 5);
 111         tbuf[5] = 0;
 112         fade = atoi(tbuf);
 113         buf += 5;
 114     }
 115
 116     id3->artist = p;
 117     buf[31] = 0;
 118     p = iso_decode(buf, p, 0, 32);
 119
 120     if (length==0) {
 121         length=3*60*1000; /* 3 minutes */
 122         fade=5*1000; /* 5 seconds */
 123     }
 124
 125     id3->length = length+fade;
 126
 127     return true;
 128 }