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 "rbunicode.h"
  30
  31 bool get_spc_metadata(int fd, struct mp3entry* id3)
  32 {
  33     /* Use the trackname part of the id3 structure as a temporary buffer */
  34     unsigned char * buf = (unsigned char *)id3->path;
  35     int read_bytes;
  36     char * p;
  37
  38     unsigned long length;
  39     unsigned long fade;
  40     bool isbinary = true;
  41     int i;
  42
  43     /* try to get the ID666 tag */
  44     if ((lseek(fd, 0x2e, SEEK_SET) < 0)
  45         || ((read_bytes = read(fd, buf, 0xD2)) < 0xD2))
  46     {
  47         DEBUGF("lseek or read failed\n");
  48         return false;
  49     }
  50
  51     p = id3->id3v2buf;
  52
  53     id3->title = p;
  54     buf[31] = 0;
  55     p = iso_decode(buf, p, 0, 32);
  56     buf += 32;
  57
  58     id3->album = p;
  59     buf[31] = 0;
  60     p = iso_decode(buf, p, 0, 32);
  61     buf += 48;
  62
  63     id3->comment = p;
  64     buf[31] = 0;
  65     p = iso_decode(buf, p, 0, 32);
  66     buf += 32;
  67
  68     /* Date check */
  69     if(buf[2] == '/' && buf[5] == '/')
  70         isbinary = false;
  71
  72     /* Reserved bytes check */
  73     if(buf[0xD2 - 0x2E - 112] >= '0' &&
  74        buf[0xD2 - 0x2E - 112] <= '9' &&
  75        buf[0xD3 - 0x2E - 112] == 0x00)
  76         isbinary = false;
  77
  78     /* is length & fade only digits? */
  79     for (i=0;i<8 && (
  80         (buf[0xA9 - 0x2E - 112+i]>='0'&&buf[0xA9 - 0x2E - 112+i]<='9') ||
  81         buf[0xA9 - 0x2E - 112+i]=='\0');
  82         i++);
  83     if (i==8) isbinary = false;
  84
  85     if(isbinary) {
  86         id3->year = buf[0] | (buf[1]<<8);
  87         buf += 11;
  88
  89         length = (buf[0] | (buf[1]<<8) | (buf[2]<<16)) * 1000;
  90         buf += 3;
  91
  92         fade = (buf[0] | (buf[1]<<8) | (buf[2]<<16) | (buf[3]<<24));
  93         buf += 4;
  94     } else {
  95         char tbuf[6];
  96
  97         buf += 6;
  98         buf[4] = 0;
  99         id3->year = atoi(buf);
 100         buf += 5;
 101
 102         memcpy(tbuf, buf, 3);
 103         tbuf[3] = 0;
 104         length = atoi(tbuf) * 1000;
 105         buf += 3;
 106
 107         memcpy(tbuf, buf, 5);
 108         tbuf[5] = 0;
 109         fade = atoi(tbuf);
 110         buf += 5;
 111     }
 112
 113     id3->artist = p;
 114     buf[31] = 0;
 115     p = iso_decode(buf, p, 0, 32);
 116
 117     if (length==0) {
 118         length=3*60*1000; /* 3 minutes */
 119         fade=5*1000; /* 5 seconds */
 120     }
 121
 122     id3->length = length+fade;
 123
 124     return true;
 125 }