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/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Common functions used for Ogg data streams (Ogg-Vorbis and OggFLAC)
*/
#include "config.h"
#include "ogg_codec.h"
enum ogg_codec
ogg_codec_detect(struct decoder *decoder, struct input_stream *is)
{
/* oggflac detection based on code in ogg123 and this post
* http://lists.xiph.org/pipermail/flac/2004-December/000393.html
* ogg123 trunk still doesn't have this patch as of June 2005 */
unsigned char buf[41];
size_t r = decoder_read(decoder, is, buf, sizeof(buf));
if (r < sizeof(buf) || memcmp(buf, "OggS", 4) != 0)
return OGG_CODEC_UNKNOWN;
if ((memcmp(buf + 29, "FLAC", 4) == 0 &&
memcmp(buf + 37, "fLaC", 4) == 0) ||
memcmp(buf + 28, "FLAC", 4) == 0 ||
memcmp(buf + 28, "fLaC", 4) == 0)
return OGG_CODEC_FLAC;
if (memcmp(buf + 28, "Opus", 4) == 0)
return OGG_CODEC_OPUS;
return OGG_CODEC_VORBIS;
}
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