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/*
This file is part of libextractor.
(C) 2002, 2003, 2009 Vidyut Samanta and Christian Grothoff
libextractor is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
libextractor is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with libextractor; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "platform.h"
#include "extractor.h"
#include "extractor_plugins.h"
#define DEBUG_EXTRACT_OGG 0
#define OGG_HEADER 0x4f676753
#if HAVE_VORBIS_VORBISFILE_H
#include <vorbis/vorbisfile.h>
#else
#error You must install the libvorbis header files!
#endif
static char *
get_comment (vorbis_comment * vc, char *label)
{
char *tag;
if (vc && (tag = vorbis_comment_query (vc, label, 0)) != NULL)
return tag;
return NULL;
}
static size_t
readOgg (void *ptr, size_t size, size_t nmemb, void *datasource)
{
struct EXTRACTOR_PluginList *plugin = datasource;
int64_t ret;
unsigned char *read_data;
ret = pl_read (plugin, &read_data, size*nmemb);
if (ret <= 0)
{
if (ret < 0)
errno = EIO;
return 0;
}
memcpy (ptr, read_data, ret);
return ret;
}
#define ADD(t,s) do { if (0 != (ret = proc (proc_cls, "ogg", t, EXTRACTOR_METAFORMAT_UTF8, "text/plain", s, strlen(s)+1))) goto FINISH; } while (0)
#define ADDG(t,d) do { m = get_comment (comments, d); if (m != NULL) ADD(t,m); } while (0)
/* mimetype = application/ogg */
int
EXTRACTOR_ogg_extract_method (struct EXTRACTOR_PluginList *plugin,
EXTRACTOR_MetaDataProcessor proc, void *proc_cls)
{
OggVorbis_File vf;
vorbis_comment *comments;
ov_callbacks callbacks;
int ret;
int64_t fsize;
const char *m;
fsize = pl_get_fsize (plugin);
if (fsize > 0 && fsize < 2 * sizeof (int))
return 1;
if (fsize == 0)
return 1;
/* TODO: rewrite pl_seek() to be STDIO-compatible (SEEK_END) and enable seeking. */
callbacks.read_func = &readOgg;
callbacks.seek_func = NULL;
callbacks.close_func = NULL;
callbacks.tell_func = NULL;
if (0 != ov_open_callbacks (plugin, &vf, NULL, 0, callbacks))
{
ov_clear (&vf);
return 1;
}
comments = ov_comment (&vf, -1);
if (NULL == comments)
{
ov_clear (&vf);
return 1;
}
ret = 0;
ADD (EXTRACTOR_METATYPE_MIMETYPE, "application/ogg");
if ((comments->vendor != NULL) && (strlen (comments->vendor) > 0))
ADD (EXTRACTOR_METATYPE_VENDOR, comments->vendor);
ADDG (EXTRACTOR_METATYPE_TITLE, "title");
ADDG (EXTRACTOR_METATYPE_ARTIST, "artist");
ADDG (EXTRACTOR_METATYPE_PERFORMER, "performer");
ADDG (EXTRACTOR_METATYPE_ALBUM, "album");
ADDG (EXTRACTOR_METATYPE_TRACK_NUMBER, "tracknumber");
ADDG (EXTRACTOR_METATYPE_DISC_NUMBER, "discnumber");
ADDG (EXTRACTOR_METATYPE_CONTACT_INFORMATION, "contact");
ADDG (EXTRACTOR_METATYPE_GENRE, "genre");
ADDG (EXTRACTOR_METATYPE_CREATION_DATE, "date");
ADDG (EXTRACTOR_METATYPE_COMMENT, "");
ADDG (EXTRACTOR_METATYPE_LOCATION_SUBLOCATION, "location");
ADDG (EXTRACTOR_METATYPE_DESCRIPTION, "description");
ADDG (EXTRACTOR_METATYPE_ISRC, "isrc");
ADDG (EXTRACTOR_METATYPE_ORGANIZATION, "organization");
ADDG (EXTRACTOR_METATYPE_COPYRIGHT, "copyright");
ADDG (EXTRACTOR_METATYPE_LICENSE, "license");
ADDG (EXTRACTOR_METATYPE_SONG_VERSION, "version");
FINISH:
ov_clear (&vf);
return 1;
}
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