apps/metadata/sid.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 "rbunicode.h"
  32
  33 /* PSID metadata info is available here:
  34    http://www.unusedino.de/ec64/technical/formats/sidplay.html */
  35 bool get_sid_metadata(int fd, struct mp3entry* id3)
  36 {
  37     /* Use the trackname part of the id3 structure as a temporary buffer */
  38     unsigned char* buf = (unsigned char *)id3->path;
  39     int read_bytes;
  40     char *p;
  41
  42
  43     if ((lseek(fd, 0, SEEK_SET) < 0)
  44          || ((read_bytes = read(fd, buf, 0x80)) < 0x80))
  45     {
  46         return false;
  47     }
  48
  49     if ((memcmp(buf, "PSID", 4) != 0))
  50     {
  51         return false;
  52     }
  53
  54     p = id3->id3v2buf;
  55
  56     /* Copy Title (assumed max 0x1f letters + 1 zero byte) */
  57     id3->title = p;
  58     buf[0x16+0x1f] = 0;
  59     p = iso_decode(&buf[0x16], p, 0, strlen(&buf[0x16])+1);
  60
  61     /* Copy Artist (assumed max 0x1f letters + 1 zero byte) */
  62     id3->artist = p;
  63     buf[0x36+0x1f] = 0;
  64     p = iso_decode(&buf[0x36], p, 0, strlen(&buf[0x36])+1);
  65
  66     /* Copy Year (assumed max 4 letters + 1 zero byte) */
  67     buf[0x56+0x4] = 0;
  68     id3->year = atoi(&buf[0x56]);
  69
  70     /* Copy Album (assumed max 0x1f-0x05 letters + 1 zero byte) */
  71     id3->album = p;
  72     buf[0x56+0x1f] = 0;
  73     p = iso_decode(&buf[0x5b], p, 0, strlen(&buf[0x5b])+1);
  74
  75     id3->bitrate = 706;
  76     id3->frequency = 44100;
  77     /* New idea as posted by Marco Alanen (ravon):
  78      * Set the songlength in seconds to the number of subsongs
  79      * so every second represents a subsong.
  80      * Users can then skip the current subsong by seeking
  81      *
  82      * Note: the number of songs is a 16bit value at 0xE, so this code only
  83      * uses the lower 8 bits of the counter.
  84     */
  85     id3->length = (buf[0xf]-1)*1000;
  86     id3->vbr = false;
  87     id3->filesize = filesize(fd);
  88
  89     return true;
  90 }