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