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-rw-r--r--src/decoder/vorbis_comments.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/src/decoder/vorbis_comments.c b/src/decoder/vorbis_comments.c
new file mode 100644
index 000000000..6c2d57b72
--- /dev/null
+++ b/src/decoder/vorbis_comments.c
@@ -0,0 +1,156 @@
+/*
+ * 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 "vorbis_comments.h"
+#include "tag.h"
+#include "tag_table.h"
+#include "tag_handler.h"
+#include "replay_gain_info.h"
+
+#include <glib.h>
+#include <assert.h>
+#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 (g_ascii_strncasecmp(comment, needle, len) == 0 &&
+ comment[len] == '=')
+ return comment + len + 1;
+
+ return NULL;
+}
+
+bool
+vorbis_comments_to_replay_gain(struct replay_gain_info *rgi, char **comments)
+{
+ const char *temp;
+ bool found = false;
+
+ replay_gain_info_init(rgi);
+
+ 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, enum tag_type tag_type,
+ const struct tag_handler *handler, void *handler_ctx)
+{
+ const char *value;
+
+ value = vorbis_comment_value(comment, name);
+ if (value != NULL) {
+ tag_handler_invoke_tag(handler, handler_ctx, tag_type, value);
+ return true;
+ }
+
+ return false;
+}
+
+static const struct tag_table vorbis_tags[] = {
+ { "tracknumber", TAG_TRACK },
+ { "discnumber", TAG_DISC },
+ { "album artist", TAG_ALBUM_ARTIST },
+ { NULL, TAG_NUM_OF_ITEM_TYPES }
+};
+
+static void
+vorbis_scan_comment(const char *comment,
+ const struct tag_handler *handler, void *handler_ctx)
+{
+ if (handler->pair != NULL) {
+ char *name = g_strdup((const char*)comment);
+ char *value = strchr(name, '=');
+
+ if (value != NULL && value > name) {
+ *value++ = 0;
+ tag_handler_invoke_pair(handler, handler_ctx,
+ name, value);
+ }
+
+ g_free(name);
+ }
+
+ for (const struct tag_table *i = vorbis_tags; i->name != NULL; ++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], 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);
+
+}
+
+struct tag *
+vorbis_comments_to_tag(char **comments)
+{
+ struct tag *tag = tag_new();
+ vorbis_comments_scan(comments, &add_tag_handler, tag);
+
+ if (tag_is_empty(tag)) {
+ tag_free(tag);
+ tag = NULL;
+ }
+
+ return tag;
+}