1 files changed, 141 insertions, 0 deletions
diff --git a/src/decoder/plugins/VorbisComments.cxx b/src/decoder/plugins/VorbisComments.cxx
new file mode 100644
index 000000000..2a0820ab5
--- /dev/null
+++ b/src/decoder/plugins/VorbisComments.cxx
@@ -0,0 +1,141 @@
+/*
+ * 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 "VorbisComments.hxx"
+#include "XiphTags.hxx"
+#include "tag/TagTable.hxx"
+#include "tag/TagHandler.hxx"
+#include "tag/TagBuilder.hxx"
+#include "ReplayGainInfo.hxx"
+#include "util/ASCII.hxx"
+#include "util/SplitString.hxx"
+
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+
+static const char *
+vorbis_comment_value(const char *comment, const char *needle)
+{
+	size_t len = strlen(needle);
+
+	if (StringEqualsCaseASCII(comment, needle, len) &&
+	    comment[len] == '=')
+		return comment + len + 1;
+
+	return nullptr;
+}
+
+bool
+vorbis_comments_to_replay_gain(ReplayGainInfo &rgi, char **comments)
+{
+	rgi.Clear();
+
+	const char *temp;
+	bool found = false;
+
+	while (*comments) {
+		if ((temp =
+		     vorbis_comment_value(*comments, "replaygain_track_gain"))) {
+			rgi.tuples[REPLAY_GAIN_TRACK].gain = atof(temp);
+			found = true;
+		} else if ((temp = vorbis_comment_value(*comments,
+							"replaygain_album_gain"))) {
+			rgi.tuples[REPLAY_GAIN_ALBUM].gain = atof(temp);
+			found = true;
+		} else if ((temp = vorbis_comment_value(*comments,
+							"replaygain_track_peak"))) {
+			rgi.tuples[REPLAY_GAIN_TRACK].peak = atof(temp);
+			found = true;
+		} else if ((temp = vorbis_comment_value(*comments,
+							"replaygain_album_peak"))) {
+			rgi.tuples[REPLAY_GAIN_ALBUM].peak = atof(temp);
+			found = true;
+		}
+
+		comments++;
+	}
+
+	return found;
+}
+
+/**
+ * Check if the comment's name equals the passed name, and if so, copy
+ * the comment value into the tag.
+ */
+static bool
+vorbis_copy_comment(const char *comment,
+		    const char *name, TagType tag_type,
+		    const struct tag_handler *handler, void *handler_ctx)
+{
+	const char *value;
+
+	value = vorbis_comment_value(comment, name);
+	if (value != nullptr) {
+		tag_handler_invoke_tag(handler, handler_ctx, tag_type, value);
+		return true;
+	}
+
+	return false;
+}
+
+static void
+vorbis_scan_comment(const char *comment,
+		    const struct tag_handler *handler, void *handler_ctx)
+{
+	if (handler->pair != nullptr) {
+		const SplitString split(comment, '=');
+		if (split.IsDefined() && !split.IsEmpty())
+			tag_handler_invoke_pair(handler, handler_ctx,
+						split.GetFirst(),
+						split.GetSecond());
+	}
+
+	for (const struct tag_table *i = xiph_tags; i->name != nullptr; ++i)
+		if (vorbis_copy_comment(comment, i->name, i->type,
+					handler, handler_ctx))
+			return;
+
+	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
+		if (vorbis_copy_comment(comment,
+					tag_item_names[i], TagType(i),
+					handler, handler_ctx))
+			return;
+}
+
+void
+vorbis_comments_scan(char **comments,
+		     const struct tag_handler *handler, void *handler_ctx)
+{
+	while (*comments)
+		vorbis_scan_comment(*comments++,
+				    handler, handler_ctx);
+
+}
+
+Tag *
+vorbis_comments_to_tag(char **comments)
+{
+	TagBuilder tag_builder;
+	vorbis_comments_scan(comments, &add_tag_handler, &tag_builder);
+	return tag_builder.IsEmpty()
+		? nullptr
+		: tag_builder.CommitNew();
+}