1 files changed, 48 insertions, 0 deletions
diff --git a/src/decoder/ogg_codec.c b/src/decoder/ogg_codec.c
new file mode 100644
index 000000000..7416f27da
--- /dev/null
+++ b/src/decoder/ogg_codec.c
@@ -0,0 +1,48 @@
+/*
+ * 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;
+}