apps/metadata/sgc.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <ctype.h>
   5 #include <inttypes.h>
   6
   7 #include "system.h"
   8 #include "metadata.h"
   9 #include "metadata_common.h"
  10 #include "metadata_parsers.h"
  11 #include "rbunicode.h"
  12
  13 static bool parse_sgc_header(int fd, struct mp3entry* id3)
  14 {
  15     /* Use the trackname part of the id3 structure as a temporary buffer */
  16     unsigned char* buf = (unsigned char *)id3->path;
  17
  18      lseek(fd, 0, SEEK_SET);
  19      if (read(fd, buf, 0xA0) < 0xA0)
  20         return false;
  21
  22     /* calculate track length with number of tracks */
  23     id3->length = buf[37] * 1000;
  24
  25     /* If meta info was found in the m3u skip next step */
  26     if (id3->title && id3->title[0]) return true;
  27
  28     char *p = id3->id3v2buf;
  29
  30     /* Some metadata entries have 32 bytes length */
  31     /* Game */
  32     memcpy(p, &buf[64], 32); *(p + 33) = '\0';
  33     id3->title = p;
  34     p += strlen(p)+1;
  35
  36     /* Artist */
  37     memcpy(p, &buf[96], 32); *(p + 33) = '\0';
  38     id3->artist = p;
  39     p += strlen(p)+1;
  40
  41     /* Copyright */
  42     memcpy(p, &buf[128], 32); *(p + 33) = '\0';
  43     id3->album = p;
  44     p += strlen(p)+1;
  45     return true;
  46 }
  47
  48
  49 bool get_sgc_metadata(int fd, struct mp3entry* id3)
  50 {
  51    uint32_t sgc_type;
  52     if ((lseek(fd, 0, SEEK_SET) < 0) ||
  53          read_uint32be(fd, &sgc_type) != (int)sizeof(sgc_type))
  54         return false;
  55
  56     id3->vbr = false;
  57     id3->filesize = filesize(fd);
  58     /* we only render 16 bits, 44.1KHz, Stereo */
  59     id3->bitrate = 706;
  60     id3->frequency = 44100;
  61
  62     /* Make sure this is an SGC file */
  63     if (sgc_type != FOURCC('S','G','C',0x1A))
  64         return false;
  65
  66     return parse_sgc_header(fd, id3);
  67 }