From 51adaf2c47761e3f2095a52a7037cd8458b77990 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Fri, 24 Jan 2014 00:02:24 +0100
Subject: decoder/*: move to decoder/plugins/

---
 src/decoder/plugins/OpusTags.cxx | 102 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/decoder/plugins/OpusTags.cxx

(limited to 'src/decoder/plugins/OpusTags.cxx')

diff --git a/src/decoder/plugins/OpusTags.cxx b/src/decoder/plugins/OpusTags.cxx
new file mode 100644
index 000000000..aff5479c0
--- /dev/null
+++ b/src/decoder/plugins/OpusTags.cxx
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2003-2014 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 "OpusTags.hxx"
+#include "OpusReader.hxx"
+#include "XiphTags.hxx"
+#include "tag/TagHandler.hxx"
+#include "tag/Tag.hxx"
+#include "ReplayGainInfo.hxx"
+
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+gcc_pure
+static TagType
+ParseOpusTagName(const char *name)
+{
+	TagType type = tag_name_parse_i(name);
+	if (type != TAG_NUM_OF_ITEM_TYPES)
+		return type;
+
+	return tag_table_lookup_i(xiph_tags, name);
+}
+
+static void
+ScanOneOpusTag(const char *name, const char *value,
+	       ReplayGainInfo *rgi,
+	       const struct tag_handler *handler, void *ctx)
+{
+	if (rgi != nullptr && strcmp(name, "R128_TRACK_GAIN") == 0) {
+		/* R128_TRACK_GAIN is a Q7.8 fixed point number in
+		   dB */
+
+		char *endptr;
+		long l = strtol(value, &endptr, 10);
+		if (endptr > value && *endptr == 0)
+			rgi->tuples[REPLAY_GAIN_TRACK].gain = double(l) / 256.;
+	}
+
+	tag_handler_invoke_pair(handler, ctx, name, value);
+
+	if (handler->tag != nullptr) {
+		TagType t = ParseOpusTagName(name);
+		if (t != TAG_NUM_OF_ITEM_TYPES)
+			tag_handler_invoke_tag(handler, ctx, t, value);
+	}
+}
+
+bool
+ScanOpusTags(const void *data, size_t size,
+	     ReplayGainInfo *rgi,
+	     const struct tag_handler *handler, void *ctx)
+{
+	OpusReader r(data, size);
+	if (!r.Expect("OpusTags", 8))
+		return false;
+
+	if (handler->pair == nullptr && handler->tag == nullptr)
+		return true;
+
+	if (!r.SkipString())
+		return false;
+
+	uint32_t n;
+	if (!r.ReadWord(n))
+		return false;
+
+	while (n-- > 0) {
+		char *p = r.ReadString();
+		if (p == nullptr)
+			return false;
+
+		char *eq = strchr(p, '=');
+		if (eq != nullptr && eq > p) {
+			*eq = 0;
+
+			ScanOneOpusTag(p, eq + 1, rgi, handler, ctx);
+		}
+
+		delete[] p;
+	}
+
+	return true;
+}
-- 
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