playlist: added a FLAC playlist plugin

This playlist plugin handles FLAC files with embedded CUE sheets.

1 files changed, 170 insertions, 0 deletions

diff --git a/src/playlist/flac_playlist_plugin.c b/src/playlist/flac_playlist_plugin.c
new file mode 100644
index 000000000..9d66fb331
--- /dev/null
+++ b/src/playlist/flac_playlist_plugin.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2003-2010 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 "playlist/flac_playlist_plugin.h"
+#include "playlist_plugin.h"
+#include "tag.h"
+#include "song.h"
+#include "decoder/flac_metadata.h"
+
+#include <FLAC/metadata.h>
+
+#include <glib.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "flac"
+
+#if defined(FLAC_API_VERSION_CURRENT) && FLAC_API_VERSION_CURRENT > 7
+
+struct flac_playlist {
+	struct playlist_provider base;
+
+	char *uri;
+
+	FLAC__StreamMetadata *cuesheet;
+	FLAC__StreamMetadata streaminfo;
+
+	unsigned next_track;
+};
+
+static struct playlist_provider *
+flac_playlist_open_uri(const char *uri)
+{
+	if (!g_path_is_absolute(uri))
+		/* only local files supported */
+		return NULL;
+
+	FLAC__StreamMetadata *cuesheet;
+	if (!FLAC__metadata_get_cuesheet(uri, &cuesheet))
+		return NULL;
+
+	struct flac_playlist *playlist = g_new(struct flac_playlist, 1);
+	playlist_provider_init(&playlist->base, &flac_playlist_plugin);
+
+	if (!FLAC__metadata_get_streaminfo(uri, &playlist->streaminfo)) {
+		FLAC__metadata_object_delete(playlist->cuesheet);
+		g_free(playlist);
+		return NULL;
+	}
+
+	playlist->uri = g_strdup(uri);
+	playlist->cuesheet = cuesheet;
+	playlist->next_track = 0;
+
+	return &playlist->base;
+}
+
+static void
+flac_playlist_close(struct playlist_provider *_playlist)
+{
+	struct flac_playlist *playlist = (struct flac_playlist *)_playlist;
+
+	g_free(playlist->uri);
+	FLAC__metadata_object_delete(playlist->cuesheet);
+	g_free(playlist);
+}
+
+static struct song *
+flac_playlist_read(struct playlist_provider *_playlist)
+{
+	struct flac_playlist *playlist = (struct flac_playlist *)_playlist;
+	const FLAC__StreamMetadata_CueSheet *cs =
+		&playlist->cuesheet->data.cue_sheet;
+
+	/* find the next audio track */
+
+	while (playlist->next_track < cs->num_tracks &&
+	       (cs->tracks[playlist->next_track].number > cs->num_tracks ||
+		cs->tracks[playlist->next_track].type != 0))
+		++playlist->next_track;
+
+	if (playlist->next_track >= cs->num_tracks)
+		return NULL;
+
+	FLAC__uint64 start = cs->tracks[playlist->next_track].offset;
+	++playlist->next_track;
+	FLAC__uint64 end = playlist->next_track < cs->num_tracks
+		? cs->tracks[playlist->next_track].offset
+		: playlist->streaminfo.data.stream_info.total_samples;
+
+	struct song *song = song_file_new(playlist->uri, NULL);
+	song->start_ms = start * 1000 /
+		playlist->streaminfo.data.stream_info.sample_rate;
+	song->end_ms = end * 1000 /
+		playlist->streaminfo.data.stream_info.sample_rate;
+
+	char track[16];
+	g_snprintf(track, sizeof(track), "%u", playlist->next_track);
+	song->tag = flac_tag_load(playlist->uri, track);
+	if (song->tag == NULL)
+		song->tag = tag_new();
+
+	song->tag->time = end > start
+		? ((end - start - 1 +
+		    playlist->streaminfo.data.stream_info.sample_rate) /
+		   playlist->streaminfo.data.stream_info.sample_rate)
+		: 0;
+
+	tag_clear_items_by_type(song->tag, TAG_TRACK);
+	tag_add_item(song->tag, TAG_TRACK, track);
+
+	return song;
+}
+
+static const char *const flac_playlist_suffixes[] = {
+	"flac",
+	NULL
+};
+
+static const char *const flac_playlist_mime_types[] = {
+	"application/flac",
+	"application/x-flac",
+	"audio/flac",
+	"audio/x-flac",
+	NULL
+};
+
+const struct playlist_plugin flac_playlist_plugin = {
+	.name = "flac",
+
+	.open_uri = flac_playlist_open_uri,
+	.close = flac_playlist_close,
+	.read = flac_playlist_read,
+
+	.suffixes = flac_playlist_suffixes,
+	.mime_types = flac_playlist_mime_types,
+};
+
+#else /* FLAC_API_VERSION_CURRENT <= 7 */
+
+static bool
+flac_playlist_init(G_GNUC_UNUSED const struct config_param *param)
+{
+	/* this libFLAC version does not support embedded CUE sheets;
+	   disable this plugin */
+	return false;
+}
+
+const struct playlist_plugin flac_playlist_plugin = {
+	.name = "flac",
+	.init = flac_playlist_init,
+};
+
+#endif