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-rw-r--r--src/decoder/plugins/VorbisComments.cxx141
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();
+}