apps/metadata/mod.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 <stdlib.h>
  23 #include <ctype.h>
  24 #include <inttypes.h>
  25
  26 #include "system.h"
  27 #include "metadata.h"
  28 #include <string-extra.h>
  29 #include "metadata_common.h"
  30 #include "metadata_parsers.h"
  31 #include "rbunicode.h"
  32
  33 #define MODULEHEADERSIZE 0x438
  34
  35 bool get_mod_metadata(int fd, struct mp3entry* id3)
  36 {
  37     /* Use the trackname part of the id3 structure as a temporary buffer */
  38     unsigned char *buf = id3->id3v2buf;
  39     unsigned char id[4];
  40     bool is_mod_file = false;
  41
  42     /* Seek to file begin */
  43     if (lseek(fd, 0, SEEK_SET) < 0)
  44         return false;
  45     /* Use id3v2buf as buffer for the track name */
  46     if (read(fd, buf, sizeof(id3->id3v2buf)) < (ssize_t)sizeof(id3->id3v2buf))
  47         return false;
  48     /* Seek to MOD ID position */
  49     if (lseek(fd, MODULEHEADERSIZE, SEEK_SET) < 0)
  50         return false;
  51     /* Read MOD ID */
  52     if (read(fd, id, sizeof(id)) < (ssize_t)sizeof(id))
  53         return false;
  54
  55     /* Mod type checking based on MikMod */
  56     /* Protracker and variants */
  57     if ((!memcmp(id, "M.K.", 4)) || (!memcmp(id, "M!K!", 4))) {
  58         is_mod_file = true;
  59     }
  60
  61     /* Star Tracker */
  62     if (((!memcmp(id, "FLT", 3)) || (!memcmp(id, "EXO", 3))) &&
  63         (isdigit(id[3]))) {
  64         char numchn = id[3] - '0';
  65         if (numchn == 4 || numchn == 8)
  66             is_mod_file = true;
  67     }
  68
  69     /* Oktalyzer (Amiga) */
  70     if (!memcmp(id, "OKTA", 4)) {
  71         is_mod_file = true;
  72     }
  73
  74     /* Oktalyser (Atari) */
  75     if (!memcmp(id, "CD81", 4)) {
  76         is_mod_file = true;
  77     }
  78
  79     /* Fasttracker */
  80     if ((!memcmp(id + 1, "CHN", 3)) && (isdigit(id[0]))) {
  81         is_mod_file = true;
  82     }
  83     /* Fasttracker or Taketracker */
  84     if (((!memcmp(id + 2, "CH", 2)) || (!memcmp(id + 2, "CN", 2)))
  85         && (isdigit(id[0])) && (isdigit(id[1]))) {
  86         is_mod_file = true;
  87     }
  88
  89     /* Don't try to play if we can't find a known mod type
  90      * (there are mod files which have nothing to do with music) */
  91     if (!is_mod_file)
  92         return false;
  93
  94     id3->title = id3->id3v2buf; /* Point title to previous read ID3 buffer. */
  95     id3->bitrate = filesize(fd)/1024; /* size in kb */
  96     id3->frequency = 44100;
  97     id3->length = 120*1000;
  98     id3->vbr = false;
  99     id3->filesize = filesize(fd);
 100
 101     return true;
 102 }
 103