song: moved code to song_update.c

Moved all the code which depends on the decoder plugins to a separate
source.  That allows leaner test programs.

1 files changed, 172 insertions, 0 deletions

diff --git a/src/song_update.c b/src/song_update.c
new file mode 100644
index 000000000..77b447e47
--- /dev/null
+++ b/src/song_update.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2003-2009 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 "song.h"
+#include "uri.h"
+#include "directory.h"
+#include "mapper.h"
+#include "decoder_list.h"
+#include "decoder_plugin.h"
+#include "tag_ape.h"
+#include "tag_id3.h"
+#include "tag.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+struct song *
+song_file_load(const char *path, struct directory *parent)
+{
+	struct song *song;
+	bool ret;
+
+	assert((parent == NULL) == (*path == '/'));
+	assert(!uri_has_scheme(path));
+	assert(strchr(path, '\n') == NULL);
+
+	song = song_file_new(path, parent);
+
+	//in archive ?
+	if (parent != NULL && parent->device == DEVICE_INARCHIVE) {
+		ret = song_file_update_inarchive(song);
+	} else {
+		ret = song_file_update(song);
+	}
+	if (!ret) {
+		song_free(song);
+		return NULL;
+	}
+
+	return song;
+}
+
+/**
+ * Attempts to load APE or ID3 tags from the specified file.
+ */
+static struct tag *
+tag_load_fallback(const char *path)
+{
+	struct tag *tag = tag_ape_load(path);
+	if (tag == NULL)
+		tag = tag_id3_load(path);
+	return tag;
+}
+
+/**
+ * The decoder plugin failed to load any tags: fall back to the APE or
+ * ID3 tag loader.
+ */
+static struct tag *
+tag_fallback(const char *path, struct tag *tag)
+{
+	struct tag *fallback = tag_load_fallback(path);
+
+	if (fallback != NULL) {
+		/* tag was successfully loaded: copy the song
+		   duration, and destroy the old (empty) tag */
+		fallback->time = tag->time;
+		tag_free(tag);
+		return fallback;
+	} else
+		/* no APE/ID3 tag found: return the empty tag */
+		return tag;
+}
+
+bool
+song_file_update(struct song *song)
+{
+	const char *suffix;
+	char *path_fs;
+	const struct decoder_plugin *plugin;
+	struct stat st;
+
+	assert(song_is_file(song));
+
+	/* check if there's a suffix and a plugin */
+
+	suffix = uri_get_suffix(song->url);
+	if (suffix == NULL)
+		return false;
+
+	plugin = decoder_plugin_from_suffix(suffix, false);
+	if (plugin == NULL)
+		return false;
+
+	path_fs = map_song_fs(song);
+	if (path_fs == NULL)
+		return false;
+
+	if (song->tag != NULL) {
+		tag_free(song->tag);
+		song->tag = NULL;
+	}
+
+	if (stat(path_fs, &st) < 0 || !S_ISREG(st.st_mode)) {
+		g_free(path_fs);
+		return false;
+	}
+
+	song->mtime = st.st_mtime;
+
+	do {
+		song->tag = plugin->tag_dup(path_fs);
+		if (song->tag != NULL)
+			break;
+
+		plugin = decoder_plugin_from_suffix(suffix, true);
+	} while (plugin != NULL);
+
+	if (song->tag != NULL && tag_is_empty(song->tag))
+		song->tag = tag_fallback(path_fs, song->tag);
+
+	g_free(path_fs);
+	return song->tag != NULL;
+}
+
+bool
+song_file_update_inarchive(struct song *song)
+{
+	const char *suffix;
+	const struct decoder_plugin *plugin;
+
+	assert(song_is_file(song));
+
+	/* check if there's a suffix and a plugin */
+
+	suffix = uri_get_suffix(song->url);
+	if (suffix == NULL)
+		return false;
+
+	plugin = decoder_plugin_from_suffix(suffix, false);
+	if (plugin == NULL)
+		return false;
+
+	if (song->tag != NULL)
+		tag_free(song->tag);
+
+	//accept every file that has music suffix
+	//because we dont support tag reading throught
+	//input streams
+	song->tag = tag_new();
+
+	return true;
+}