49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Common functions used for Ogg data streams (Ogg-Vorbis and OggFLAC)
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*/
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#include "config.h"
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#include "OggCodec.hxx"
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enum ogg_codec
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ogg_codec_detect(struct decoder *decoder, struct input_stream *is)
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{
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/* oggflac detection based on code in ogg123 and this post
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* http://lists.xiph.org/pipermail/flac/2004-December/000393.html
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* ogg123 trunk still doesn't have this patch as of June 2005 */
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unsigned char buf[41];
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size_t r = decoder_read(decoder, is, buf, sizeof(buf));
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if (r < sizeof(buf) || memcmp(buf, "OggS", 4) != 0)
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return OGG_CODEC_UNKNOWN;
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if ((memcmp(buf + 29, "FLAC", 4) == 0 &&
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memcmp(buf + 37, "fLaC", 4) == 0) ||
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memcmp(buf + 28, "FLAC", 4) == 0 ||
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memcmp(buf + 28, "fLaC", 4) == 0)
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return OGG_CODEC_FLAC;
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if (memcmp(buf + 28, "Opus", 4) == 0)
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return OGG_CODEC_OPUS;
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return OGG_CODEC_VORBIS;
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}
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