src/inputPlugins/_ogg_common.c

   1 /* the Music Player Daemon (MPD)
   2  * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
   3  * This project's homepage is: http://www.musicpd.org
   4  *
   5  * Common functions used for Ogg data streams (Ogg-Vorbis and OggFLAC)
   6  * (c) 2005 by Eric Wong <normalperson@yhbt.net>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "../inputPlugin.h"
  23
  24 #if defined(HAVE_OGGFLAC) || defined(HAVE_OGGVORBIS)
  25
  26 #include "../utils.h"
  27 #include "_ogg_common.h"
  28
  29 #include <string.h>
  30
  31 ogg_stream_type ogg_stream_type_detect(InputStream * inStream)
  32 {
  33         /* oggflac detection based on code in ogg123 and this post
  34          * http://lists.xiph.org/pipermail/flac/2004-December/000393.html
  35          * ogg123 trunk still doesn't have this patch as of June 2005 */
  36         unsigned char buf[41];
  37         size_t r, to_read = 41;
  38
  39         seekInputStream(inStream, 0, SEEK_SET);
  40
  41         while (to_read) {
  42                 r = readFromInputStream(inStream, buf, 1, to_read);
  43                 if (inStream->error)
  44                         break;
  45                 to_read -= r;
  46                 if (!r && !inputStreamAtEOF(inStream))
  47                         my_usleep(10000);
  48                 else
  49                         break;
  50         }
  51
  52         seekInputStream(inStream, 0, SEEK_SET);
  53
  54         if (r >= 32 && memcmp(buf, "OggS", 4) == 0 && ((memcmp
  55                                                         (buf + 29, "FLAC",
  56                                                          4) == 0
  57                                                         && memcmp(buf + 37,
  58                                                                   "fLaC",
  59                                                                   4) == 0)
  60                                                        ||
  61                                                        (memcmp
  62                                                         (buf + 28, "FLAC",
  63                                                          4) == 0)
  64                                                        ||
  65                                                        (memcmp
  66                                                         (buf + 28, "fLaC",
  67                                                          4) == 0))) {
  68                 return FLAC;
  69         }
  70         return VORBIS;
  71 }
  72
  73 #endif /* defined(HAVE_OGGFLAC || defined(HAVE_OGGVORBIS) */