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-rw-r--r--src/decoder/OpusHead.cxx44
1 files changed, 44 insertions, 0 deletions
diff --git a/src/decoder/OpusHead.cxx b/src/decoder/OpusHead.cxx
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+++ b/src/decoder/OpusHead.cxx
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+/*
+ * Copyright (C) 2003-2012 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.
+ */
+
+#include "config.h"
+#include "OpusHead.hxx"
+
+#include <stdint.h>
+#include <string.h>
+
+struct OpusHead {
+ char signature[8];
+ uint8_t version, channels;
+ uint16_t pre_skip;
+ uint32_t sample_rate;
+ uint16_t output_gain;
+ uint8_t channel_mapping;
+};
+
+bool
+ScanOpusHeader(const void *data, size_t size, unsigned &channels_r)
+{
+ const OpusHead *h = (const OpusHead *)data;
+ if (size < 19 || (h->version & 0xf0) != 0)
+ return false;
+
+ channels_r = h->channels;
+ return true;
+}