35 lines
958 B
C++
35 lines
958 B
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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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 "OggCodec.hxx"
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#include "../DecoderAPI.hxx"
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#include <string.h>
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enum ogg_codec
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ogg_codec_detect(DecoderClient *client, InputStream &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(client, 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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